clang 10.0.0

SemaExpr.cpp
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1 //===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements semantic analysis for expressions.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "TreeTransform.h"
14 #include "clang/AST/ASTConsumer.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/ASTLambda.h"
17 #include "clang/AST/ASTMutationListener.h"
18 #include "clang/AST/CXXInheritance.h"
19 #include "clang/AST/DeclObjC.h"
20 #include "clang/AST/DeclTemplate.h"
21 #include "clang/AST/EvaluatedExprVisitor.h"
22 #include "clang/AST/Expr.h"
23 #include "clang/AST/ExprCXX.h"
24 #include "clang/AST/ExprObjC.h"
25 #include "clang/AST/ExprOpenMP.h"
26 #include "clang/AST/RecursiveASTVisitor.h"
27 #include "clang/AST/TypeLoc.h"
28 #include "clang/Basic/Builtins.h"
29 #include "clang/Basic/FixedPoint.h"
30 #include "clang/Basic/PartialDiagnostic.h"
31 #include "clang/Basic/SourceManager.h"
32 #include "clang/Basic/TargetInfo.h"
33 #include "clang/Lex/LiteralSupport.h"
34 #include "clang/Lex/Preprocessor.h"
35 #include "clang/Sema/AnalysisBasedWarnings.h"
36 #include "clang/Sema/DeclSpec.h"
37 #include "clang/Sema/DelayedDiagnostic.h"
38 #include "clang/Sema/Designator.h"
39 #include "clang/Sema/Initialization.h"
40 #include "clang/Sema/Lookup.h"
41 #include "clang/Sema/Overload.h"
42 #include "clang/Sema/ParsedTemplate.h"
43 #include "clang/Sema/Scope.h"
44 #include "clang/Sema/ScopeInfo.h"
45 #include "clang/Sema/SemaFixItUtils.h"
46 #include "clang/Sema/SemaInternal.h"
47 #include "clang/Sema/Template.h"
48 #include "llvm/Support/ConvertUTF.h"
49 using namespace clang;
50 using namespace sema;
51
52 /// Determine whether the use of this declaration is valid, without
53 /// emitting diagnostics.
54 bool Sema::CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid) {
55 // See if this is an auto-typed variable whose initializer we are parsing.
56 if (ParsingInitForAutoVars.count(D))
57 return false;
58
59 // See if this is a deleted function.
60 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
61 if (FD->isDeleted())
62 return false;
63
64 // If the function has a deduced return type, and we can't deduce it,
65 // then we can't use it either.
66 if (getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() &&
67 DeduceReturnType(FD, SourceLocation(), /*Diagnose*/ false))
68 return false;
69
70 // See if this is an aligned allocation/deallocation function that is
71 // unavailable.
72 if (TreatUnavailableAsInvalid &&
73 isUnavailableAlignedAllocationFunction(*FD))
74 return false;
75 }
76
77 // See if this function is unavailable.
78 if (TreatUnavailableAsInvalid && D->getAvailability() == AR_Unavailable &&
79 cast<Decl>(CurContext)->getAvailability() != AR_Unavailable)
80 return false;
81
82 return true;
83 }
84
85 static void DiagnoseUnusedOfDecl(Sema &S, NamedDecl *D, SourceLocation Loc) {
86 // Warn if this is used but marked unused.
87 if (const auto *A = D->getAttr<UnusedAttr>()) {
88 // [[maybe_unused]] should not diagnose uses, but __attribute__((unused))
89 // should diagnose them.
90 if (A->getSemanticSpelling() != UnusedAttr::CXX11_maybe_unused &&
91 A->getSemanticSpelling() != UnusedAttr::C2x_maybe_unused) {
92 const Decl *DC = cast_or_null<Decl>(S.getCurObjCLexicalContext());
93 if (DC && !DC->hasAttr<UnusedAttr>())
94 S.Diag(Loc, diag::warn_used_but_marked_unused) << D->getDeclName();
95 }
96 }
97 }
98
99 /// Emit a note explaining that this function is deleted.
100 void Sema::NoteDeletedFunction(FunctionDecl *Decl) {
101 assert(Decl && Decl->isDeleted());
102
103 if (Decl->isDefaulted()) {
104 // If the method was explicitly defaulted, point at that declaration.
105 if (!Decl->isImplicit())
106 Diag(Decl->getLocation(), diag::note_implicitly_deleted);
107
108 // Try to diagnose why this special member function was implicitly
109 // deleted. This might fail, if that reason no longer applies.
110 DiagnoseDeletedDefaultedFunction(Decl);
111 return;
112 }
113
114 auto *Ctor = dyn_cast<CXXConstructorDecl>(Decl);
115 if (Ctor && Ctor->isInheritingConstructor())
116 return NoteDeletedInheritingConstructor(Ctor);
117
118 Diag(Decl->getLocation(), diag::note_availability_specified_here)
119 << Decl << 1;
120 }
121
122 /// Determine whether a FunctionDecl was ever declared with an
123 /// explicit storage class.
124 static bool hasAnyExplicitStorageClass(const FunctionDecl *D) {
125 for (auto I : D->redecls()) {
126 if (I->getStorageClass() != SC_None)
127 return true;
128 }
129 return false;
130 }
131
132 /// Check whether we're in an extern inline function and referring to a
133 /// variable or function with internal linkage (C11 6.7.4p3).
134 ///
135 /// This is only a warning because we used to silently accept this code, but
136 /// in many cases it will not behave correctly. This is not enabled in C++ mode
137 /// because the restriction language is a bit weaker (C++11 [basic.def.odr]p6)
138 /// and so while there may still be user mistakes, most of the time we can't
139 /// prove that there are errors.
140 static void diagnoseUseOfInternalDeclInInlineFunction(Sema &S,
141 const NamedDecl *D,
142 SourceLocation Loc) {
143 // This is disabled under C++; there are too many ways for this to fire in
144 // contexts where the warning is a false positive, or where it is technically
145 // correct but benign.
146 if (S.getLangOpts().CPlusPlus)
147 return;
148
149 // Check if this is an inlined function or method.
150 FunctionDecl *Current = S.getCurFunctionDecl();
151 if (!Current)
152 return;
153 if (!Current->isInlined())
154 return;
155 if (!Current->isExternallyVisible())
156 return;
157
158 // Check if the decl has internal linkage.
159 if (D->getFormalLinkage() != InternalLinkage)
160 return;
161
162 // Downgrade from ExtWarn to Extension if
163 // (1) the supposedly external inline function is in the main file,
164 // and probably won't be included anywhere else.
165 // (2) the thing we're referencing is a pure function.
166 // (3) the thing we're referencing is another inline function.
167 // This last can give us false negatives, but it's better than warning on
168 // wrappers for simple C library functions.
169 const FunctionDecl *UsedFn = dyn_cast<FunctionDecl>(D);
170 bool DowngradeWarning = S.getSourceManager().isInMainFile(Loc);
171 if (!DowngradeWarning && UsedFn)
172 DowngradeWarning = UsedFn->isInlined() || UsedFn->hasAttr<ConstAttr>();
173
174 S.Diag(Loc, DowngradeWarning ? diag::ext_internal_in_extern_inline_quiet
175 : diag::ext_internal_in_extern_inline)
176 << /*IsVar=*/!UsedFn << D;
177
178 S.MaybeSuggestAddingStaticToDecl(Current);
179
180 S.Diag(D->getCanonicalDecl()->getLocation(), diag::note_entity_declared_at)
181 << D;
182 }
183
184 void Sema::MaybeSuggestAddingStaticToDecl(const FunctionDecl *Cur) {
185 const FunctionDecl *First = Cur->getFirstDecl();
186
187 // Suggest "static" on the function, if possible.
188 if (!hasAnyExplicitStorageClass(First)) {
189 SourceLocation DeclBegin = First->getSourceRange().getBegin();
190 Diag(DeclBegin, diag::note_convert_inline_to_static)
191 << Cur << FixItHint::CreateInsertion(DeclBegin, "static ");
192 }
193 }
194
195 /// Determine whether the use of this declaration is valid, and
196 /// emit any corresponding diagnostics.
197 ///
198 /// This routine diagnoses various problems with referencing
199 /// declarations that can occur when using a declaration. For example,
200 /// it might warn if a deprecated or unavailable declaration is being
201 /// used, or produce an error (and return true) if a C++0x deleted
202 /// function is being used.
203 ///
204 /// \returns true if there was an error (this declaration cannot be
205 /// referenced), false otherwise.
206 ///
207 bool Sema::DiagnoseUseOfDecl(NamedDecl *D, ArrayRef<SourceLocation> Locs,
208 const ObjCInterfaceDecl *UnknownObjCClass,
209 bool ObjCPropertyAccess,
210 bool AvoidPartialAvailabilityChecks,
211 ObjCInterfaceDecl *ClassReceiver) {
212 SourceLocation Loc = Locs.front();
213 if (getLangOpts().CPlusPlus && isa<FunctionDecl>(D)) {
214 // If there were any diagnostics suppressed by template argument deduction,
215 // emit them now.
216 auto Pos = SuppressedDiagnostics.find(D->getCanonicalDecl());
217 if (Pos != SuppressedDiagnostics.end()) {
218 for (const PartialDiagnosticAt &Suppressed : Pos->second)
219 Diag(Suppressed.first, Suppressed.second);
220
221 // Clear out the list of suppressed diagnostics, so that we don't emit
222 // them again for this specialization. However, we don't obsolete this
223 // entry from the table, because we want to avoid ever emitting these
224 // diagnostics again.
225 Pos->second.clear();
226 }
227
228 // C++ [basic.start.main]p3:
229 // The function 'main' shall not be used within a program.
230 if (cast<FunctionDecl>(D)->isMain())
231 Diag(Loc, diag::ext_main_used);
232
233 diagnoseUnavailableAlignedAllocation(*cast<FunctionDecl>(D), Loc);
234 }
235
236 // See if this is an auto-typed variable whose initializer we are parsing.
237 if (ParsingInitForAutoVars.count(D)) {
238 if (isa<BindingDecl>(D)) {
239 Diag(Loc, diag::err_binding_cannot_appear_in_own_initializer)
240 << D->getDeclName();
241 } else {
242 Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer)
243 << D->getDeclName() << cast<VarDecl>(D)->getType();
244 }
245 return true;
246 }
247
248 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
249 // See if this is a deleted function.
250 if (FD->isDeleted()) {
251 auto *Ctor = dyn_cast<CXXConstructorDecl>(FD);
252 if (Ctor && Ctor->isInheritingConstructor())
253 Diag(Loc, diag::err_deleted_inherited_ctor_use)
254 << Ctor->getParent()
255 << Ctor->getInheritedConstructor().getConstructor()->getParent();
256 else
257 Diag(Loc, diag::err_deleted_function_use);
258 NoteDeletedFunction(FD);
259 return true;
260 }
261
262 // [expr.prim.id]p4
263 // A program that refers explicitly or implicitly to a function with a
264 // trailing requires-clause whose constraint-expression is not satisfied,
265 // other than to declare it, is ill-formed. [...]
266 //
267 // See if this is a function with constraints that need to be satisfied.
268 // Check this before deducing the return type, as it might instantiate the
269 // definition.
270 if (FD->getTrailingRequiresClause()) {
271 ConstraintSatisfaction Satisfaction;
272 if (CheckFunctionConstraints(FD, Satisfaction, Loc))
273 // A diagnostic will have already been generated (non-constant
274 // constraint expression, for example)
275 return true;
276 if (!Satisfaction.IsSatisfied) {
277 Diag(Loc,
278 diag::err_reference_to_function_with_unsatisfied_constraints)
279 << D;
280 DiagnoseUnsatisfiedConstraint(Satisfaction);
281 return true;
282 }
283 }
284
285 // If the function has a deduced return type, and we can't deduce it,
286 // then we can't use it either.
287 if (getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() &&
288 DeduceReturnType(FD, Loc))
289 return true;
290
291 if (getLangOpts().CUDA && !CheckCUDACall(Loc, FD))
292 return true;
293 }
294
295 if (auto *MD = dyn_cast<CXXMethodDecl>(D)) {
296 // Lambdas are only default-constructible or assignable in C++2a onwards.
297 if (MD->getParent()->isLambda() &&
298 ((isa<CXXConstructorDecl>(MD) &&
299 cast<CXXConstructorDecl>(MD)->isDefaultConstructor()) ||
300 MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())) {
301 Diag(Loc, diag::warn_cxx17_compat_lambda_def_ctor_assign)
302 << !isa<CXXConstructorDecl>(MD);
303 }
304 }
305
306 auto getReferencedObjCProp = [](const NamedDecl *D) ->
307 const ObjCPropertyDecl * {
308 if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
309 return MD->findPropertyDecl();
310 return nullptr;
311 };
312 if (const ObjCPropertyDecl *ObjCPDecl = getReferencedObjCProp(D)) {
313 if (diagnoseArgIndependentDiagnoseIfAttrs(ObjCPDecl, Loc))
314 return true;
315 } else if (diagnoseArgIndependentDiagnoseIfAttrs(D, Loc)) {
316 return true;
317 }
318
319 // [OpenMP 4.0], 2.15 declare reduction Directive, Restrictions
320 // Only the variables omp_in and omp_out are allowed in the combiner.
321 // Only the variables omp_priv and omp_orig are allowed in the
322 // initializer-clause.
323 auto *DRD = dyn_cast<OMPDeclareReductionDecl>(CurContext);
324 if (LangOpts.OpenMP && DRD && !CurContext->containsDecl(D) &&
325 isa<VarDecl>(D)) {
326 Diag(Loc, diag::err_omp_wrong_var_in_declare_reduction)
327 << getCurFunction()->HasOMPDeclareReductionCombiner;
328 Diag(D->getLocation(), diag::note_entity_declared_at) << D;
329 return true;
330 }
331
332 // [OpenMP 5.0], 2.19.7.3. declare mapper Directive, Restrictions
333 // List-items in map clauses on this construct may only refer to the declared
334 // variable var and entities that could be referenced by a procedure defined
335 // at the same location
336 auto *DMD = dyn_cast<OMPDeclareMapperDecl>(CurContext);
337 if (LangOpts.OpenMP && DMD && !CurContext->containsDecl(D) &&
338 isa<VarDecl>(D)) {
339 Diag(Loc, diag::err_omp_declare_mapper_wrong_var)
340 << DMD->getVarName().getAsString();
341 Diag(D->getLocation(), diag::note_entity_declared_at) << D;
342 return true;
343 }
344
345 DiagnoseAvailabilityOfDecl(D, Locs, UnknownObjCClass, ObjCPropertyAccess,
346 AvoidPartialAvailabilityChecks, ClassReceiver);
347
348 DiagnoseUnusedOfDecl(*this, D, Loc);
349
350 diagnoseUseOfInternalDeclInInlineFunction(*this, D, Loc);
351
352 if (isa<ParmVarDecl>(D) && isa<RequiresExprBodyDecl>(D->getDeclContext()) &&
353 !isUnevaluatedContext()) {
354 // C++ [expr.prim.req.nested] p3
355 // A local parameter shall only appear as an unevaluated operand
356 // (Clause 8) within the constraint-expression.
357 Diag(Loc, diag::err_requires_expr_parameter_referenced_in_evaluated_context)
358 << D;
359 Diag(D->getLocation(), diag::note_entity_declared_at) << D;
360 return true;
361 }
362
363 return false;
364 }
365
366 /// DiagnoseSentinelCalls - This routine checks whether a call or
367 /// message-send is to a declaration with the sentinel attribute, and
368 /// if so, it checks that the requirements of the sentinel are
369 /// satisfied.
370 void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
371 ArrayRef<Expr *> Args) {
372 const SentinelAttr *attr = D->getAttr<SentinelAttr>();
373 if (!attr)
374 return;
375
376 // The number of formal parameters of the declaration.
377 unsigned numFormalParams;
378
379 // The kind of declaration. This is also an index into a %select in
380 // the diagnostic.
381 enum CalleeType { CT_Function, CT_Method, CT_Block } calleeType;
382
383 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
384 numFormalParams = MD->param_size();
385 calleeType = CT_Method;
386 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
387 numFormalParams = FD->param_size();
388 calleeType = CT_Function;
389 } else if (isa<VarDecl>(D)) {
390 QualType type = cast<ValueDecl>(D)->getType();
391 const FunctionType *fn = nullptr;
392 if (const PointerType *ptr = type->getAs<PointerType>()) {
393 fn = ptr->getPointeeType()->getAs<FunctionType>();
394 if (!fn) return;
395 calleeType = CT_Function;
396 } else if (const BlockPointerType *ptr = type->getAs<BlockPointerType>()) {
397 fn = ptr->getPointeeType()->castAs<FunctionType>();
398 calleeType = CT_Block;
399 } else {
400 return;
401 }
402
403 if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fn)) {
404 numFormalParams = proto->getNumParams();
405 } else {
406 numFormalParams = 0;
407 }
408 } else {
409 return;
410 }
411
412 // "nullPos" is the number of formal parameters at the end which
413 // effectively count as part of the variadic arguments. This is
414 // useful if you would prefer to not have *any* formal parameters,
415 // but the language forces you to have at least one.
416 unsigned nullPos = attr->getNullPos();
417 assert((nullPos == 0 || nullPos == 1) && "invalid null position on sentinel");
418 numFormalParams = (nullPos > numFormalParams ? 0 : numFormalParams - nullPos);
419
420 // The number of arguments which should follow the sentinel.
421 unsigned numArgsAfterSentinel = attr->getSentinel();
422
423 // If there aren't enough arguments for all the formal parameters,
424 // the sentinel, and the args after the sentinel, complain.
425 if (Args.size() < numFormalParams + numArgsAfterSentinel + 1) {
426 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
427 Diag(D->getLocation(), diag::note_sentinel_here) << int(calleeType);
428 return;
429 }
430
431 // Otherwise, find the sentinel expression.
432 Expr *sentinelExpr = Args[Args.size() - numArgsAfterSentinel - 1];
433 if (!sentinelExpr) return;
434 if (sentinelExpr->isValueDependent()) return;
435 if (Context.isSentinelNullExpr(sentinelExpr)) return;
436
437 // Pick a reasonable string to insert. Optimistically use 'nil', 'nullptr',
438 // or 'NULL' if those are actually defined in the context. Only use
439 // 'nil' for ObjC methods, where it's much more likely that the
440 // variadic arguments form a list of object pointers.
441 SourceLocation MissingNilLoc = getLocForEndOfToken(sentinelExpr->getEndLoc());
442 std::string NullValue;
443 if (calleeType == CT_Method && PP.isMacroDefined("nil"))
444 NullValue = "nil";
445 else if (getLangOpts().CPlusPlus11)
446 NullValue = "nullptr";
447 else if (PP.isMacroDefined("NULL"))
448 NullValue = "NULL";
449 else
450 NullValue = "(void*) 0";
451
452 if (MissingNilLoc.isInvalid())
453 Diag(Loc, diag::warn_missing_sentinel) << int(calleeType);
454 else
455 Diag(MissingNilLoc, diag::warn_missing_sentinel)
456 << int(calleeType)
457 << FixItHint::CreateInsertion(MissingNilLoc, ", " + NullValue);
458 Diag(D->getLocation(), diag::note_sentinel_here) << int(calleeType);
459 }
460
461 SourceRange Sema::getExprRange(Expr *E) const {
462 return E ? E->getSourceRange() : SourceRange();
463 }
464
465 //===----------------------------------------------------------------------===//
466 // Standard Promotions and Conversions
467 //===----------------------------------------------------------------------===//
468
469 /// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
470 ExprResult Sema::DefaultFunctionArrayConversion(Expr *E, bool Diagnose) {
471 // Handle any placeholder expressions which made it here.
472 if (E->getType()->isPlaceholderType()) {
473 ExprResult result = CheckPlaceholderExpr(E);
474 if (result.isInvalid()) return ExprError();
475 E = result.get();
476 }
477
478 QualType Ty = E->getType();
479 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
480
481 if (Ty->isFunctionType()) {
482 if (auto *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts()))
483 if (auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl()))
484 if (!checkAddressOfFunctionIsAvailable(FD, Diagnose, E->getExprLoc()))
485 return ExprError();
486
487 E = ImpCastExprToType(E, Context.getPointerType(Ty),
488 CK_FunctionToPointerDecay).get();
489 } else if (Ty->isArrayType()) {
490 // In C90 mode, arrays only promote to pointers if the array expression is
491 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
492 // type 'array of type' is converted to an expression that has type 'pointer
493 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression
494 // that has type 'array of type' ...". The relevant change is "an lvalue"
495 // (C90) to "an expression" (C99).
496 //
497 // C++ 4.2p1:
498 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
499 // T" can be converted to an rvalue of type "pointer to T".
500 //
501 if (getLangOpts().C99 || getLangOpts().CPlusPlus || E->isLValue())
502 E = ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
503 CK_ArrayToPointerDecay).get();
504 }
505 return E;
506 }
507
508 static void CheckForNullPointerDereference(Sema &S, Expr *E) {
509 // Check to see if we are dereferencing a null pointer. If so,
510 // and if not volatile-qualified, this is undefined behavior that the
511 // optimizer will delete, so warn about it. People sometimes try to use this
512 // to get a deterministic trap and are surprised by clang's behavior. This
513 // only handles the pattern "*null", which is a very syntactic check.
514 const auto *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts());
515 if (UO && UO->getOpcode() == UO_Deref &&
516 UO->getSubExpr()->getType()->isPointerType()) {
517 const LangAS AS =
518 UO->getSubExpr()->getType()->getPointeeType().getAddressSpace();
519 if ((!isTargetAddressSpace(AS) ||
520 (isTargetAddressSpace(AS) && toTargetAddressSpace(AS) == 0)) &&
521 UO->getSubExpr()->IgnoreParenCasts()->isNullPointerConstant(
522 S.Context, Expr::NPC_ValueDependentIsNotNull) &&
523 !UO->getType().isVolatileQualified()) {
524 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
525 S.PDiag(diag::warn_indirection_through_null)
526 << UO->getSubExpr()->getSourceRange());
527 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
528 S.PDiag(diag::note_indirection_through_null));
529 }
530 }
531 }
532
533 static void DiagnoseDirectIsaAccess(Sema &S, const ObjCIvarRefExpr *OIRE,
534 SourceLocation AssignLoc,
535 const Expr* RHS) {
536 const ObjCIvarDecl *IV = OIRE->getDecl();
537 if (!IV)
538 return;
539
540 DeclarationName MemberName = IV->getDeclName();
541 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
542 if (!Member || !Member->isStr("isa"))
543 return;
544
545 const Expr *Base = OIRE->getBase();
546 QualType BaseType = Base->getType();
547 if (OIRE->isArrow())
548 BaseType = BaseType->getPointeeType();
549 if (const ObjCObjectType *OTy = BaseType->getAs<ObjCObjectType>())
550 if (ObjCInterfaceDecl *IDecl = OTy->getInterface()) {
551 ObjCInterfaceDecl *ClassDeclared = nullptr;
552 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);
553 if (!ClassDeclared->getSuperClass()
554 && (*ClassDeclared->ivar_begin()) == IV) {
555 if (RHS) {
556 NamedDecl *ObjectSetClass =
557 S.LookupSingleName(S.TUScope,
558 &S.Context.Idents.get("object_setClass"),
559 SourceLocation(), S.LookupOrdinaryName);
560 if (ObjectSetClass) {
561 SourceLocation RHSLocEnd = S.getLocForEndOfToken(RHS->getEndLoc());
562 S.Diag(OIRE->getExprLoc(), diag::warn_objc_isa_assign)
563 << FixItHint::CreateInsertion(OIRE->getBeginLoc(),
564 "object_setClass(")
565 << FixItHint::CreateReplacement(
566 SourceRange(OIRE->getOpLoc(), AssignLoc), ",")
567 << FixItHint::CreateInsertion(RHSLocEnd, ")");
568 }
569 else
570 S.Diag(OIRE->getLocation(), diag::warn_objc_isa_assign);
571 } else {
572 NamedDecl *ObjectGetClass =
573 S.LookupSingleName(S.TUScope,
574 &S.Context.Idents.get("object_getClass"),
575 SourceLocation(), S.LookupOrdinaryName);
576 if (ObjectGetClass)
577 S.Diag(OIRE->getExprLoc(), diag::warn_objc_isa_use)
578 << FixItHint::CreateInsertion(OIRE->getBeginLoc(),
579 "object_getClass(")
580 << FixItHint::CreateReplacement(
581 SourceRange(OIRE->getOpLoc(), OIRE->getEndLoc()), ")");
582 else
583 S.Diag(OIRE->getLocation(), diag::warn_objc_isa_use);
584 }
585 S.Diag(IV->getLocation(), diag::note_ivar_decl);
586 }
587 }
588 }
589
590 ExprResult Sema::DefaultLvalueConversion(Expr *E) {
591 // Handle any placeholder expressions which made it here.
592 if (E->getType()->isPlaceholderType()) {
593 ExprResult result = CheckPlaceholderExpr(E);
594 if (result.isInvalid()) return ExprError();
595 E = result.get();
596 }
597
598 // C++ [conv.lval]p1:
599 // A glvalue of a non-function, non-array type T can be
600 // converted to a prvalue.
601 if (!E->isGLValue()) return E;
602
603 QualType T = E->getType();
604 assert(!T.isNull() && "r-value conversion on typeless expression?");
605
606 // We don't want to throw lvalue-to-rvalue casts on top of
607 // expressions of certain types in C++.
608 if (getLangOpts().CPlusPlus &&
609 (E->getType() == Context.OverloadTy ||
610 T->isDependentType() ||
611 T->isRecordType()))
612 return E;
613
614 // The C standard is actually really unclear on this point, and
615 // DR106 tells us what the result should be but not why. It's
616 // generally best to say that void types just doesn't undergo
617 // lvalue-to-rvalue at all. Note that expressions of unqualified
618 // 'void' type are never l-values, but qualified void can be.
619 if (T->isVoidType())
620 return E;
621
622 // OpenCL usually rejects direct accesses to values of 'half' type.
623 if (getLangOpts().OpenCL && !getOpenCLOptions().isEnabled("cl_khr_fp16") &&
624 T->isHalfType()) {
625 Diag(E->getExprLoc(), diag::err_opencl_half_load_store)
626 << 0 << T;
627 return ExprError();
628 }
629
630 CheckForNullPointerDereference(*this, E);
631 if (const ObjCIsaExpr *OISA = dyn_cast<ObjCIsaExpr>(E->IgnoreParenCasts())) {
632 NamedDecl *ObjectGetClass = LookupSingleName(TUScope,
633 &Context.Idents.get("object_getClass"),
634 SourceLocation(), LookupOrdinaryName);
635 if (ObjectGetClass)
636 Diag(E->getExprLoc(), diag::warn_objc_isa_use)
637 << FixItHint::CreateInsertion(OISA->getBeginLoc(), "object_getClass(")
638 << FixItHint::CreateReplacement(
639 SourceRange(OISA->getOpLoc(), OISA->getIsaMemberLoc()), ")");
640 else
641 Diag(E->getExprLoc(), diag::warn_objc_isa_use);
642 }
643 else if (const ObjCIvarRefExpr *OIRE =
644 dyn_cast<ObjCIvarRefExpr>(E->IgnoreParenCasts()))
645 DiagnoseDirectIsaAccess(*this, OIRE, SourceLocation(), /* Expr*/nullptr);
646
647 // C++ [conv.lval]p1:
648 // [...] If T is a non-class type, the type of the prvalue is the
649 // cv-unqualified version of T. Otherwise, the type of the
650 // rvalue is T.
651 //
652 // C99 6.3.2.1p2:
653 // If the lvalue has qualified type, the value has the unqualified
654 // version of the type of the lvalue; otherwise, the value has the
655 // type of the lvalue.
656 if (T.hasQualifiers())
657 T = T.getUnqualifiedType();
658
659 // Under the MS ABI, lock down the inheritance model now.
660 if (T->isMemberPointerType() &&
661 Context.getTargetInfo().getCXXABI().isMicrosoft())
662 (void)isCompleteType(E->getExprLoc(), T);
663
664 ExprResult Res = CheckLValueToRValueConversionOperand(E);
665 if (Res.isInvalid())
666 return Res;
667 E = Res.get();
668
669 // Loading a __weak object implicitly retains the value, so we need a cleanup to
670 // balance that.
671 if (E->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
672 Cleanup.setExprNeedsCleanups(true);
673
674 // C++ [conv.lval]p3:
675 // If T is cv std::nullptr_t, the result is a null pointer constant.
676 CastKind CK = T->isNullPtrType() ? CK_NullToPointer : CK_LValueToRValue;
677 Res = ImplicitCastExpr::Create(Context, T, CK, E, nullptr, VK_RValue);
678
679 // C11 6.3.2.1p2:
680 // ... if the lvalue has atomic type, the value has the non-atomic version
681 // of the type of the lvalue ...
682 if (const AtomicType *Atomic = T->getAs<AtomicType>()) {
683 T = Atomic->getValueType().getUnqualifiedType();
684 Res = ImplicitCastExpr::Create(Context, T, CK_AtomicToNonAtomic, Res.get(),
685 nullptr, VK_RValue);
686 }
687
688 return Res;
689 }
690
691 ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E, bool Diagnose) {
692 ExprResult Res = DefaultFunctionArrayConversion(E, Diagnose);
693 if (Res.isInvalid())
694 return ExprError();
695 Res = DefaultLvalueConversion(Res.get());
696 if (Res.isInvalid())
697 return ExprError();
698 return Res;
699 }
700
701 /// CallExprUnaryConversions - a special case of an unary conversion
702 /// performed on a function designator of a call expression.
703 ExprResult Sema::CallExprUnaryConversions(Expr *E) {
704 QualType Ty = E->getType();
705 ExprResult Res = E;
706 // Only do implicit cast for a function type, but not for a pointer
707 // to function type.
708 if (Ty->isFunctionType()) {
709 Res = ImpCastExprToType(E, Context.getPointerType(Ty),
710 CK_FunctionToPointerDecay).get();
711 if (Res.isInvalid())
712 return ExprError();
713 }
714 Res = DefaultLvalueConversion(Res.get());
715 if (Res.isInvalid())
716 return ExprError();
717 return Res.get();
718 }
719
720 /// UsualUnaryConversions - Performs various conversions that are common to most
721 /// operators (C99 6.3). The conversions of array and function types are
722 /// sometimes suppressed. For example, the array->pointer conversion doesn't
723 /// apply if the array is an argument to the sizeof or address (&) operators.
724 /// In these instances, this routine should *not* be called.
725 ExprResult Sema::UsualUnaryConversions(Expr *E) {
726 // First, convert to an r-value.
727 ExprResult Res = DefaultFunctionArrayLvalueConversion(E);
728 if (Res.isInvalid())
729 return ExprError();
730 E = Res.get();
731
732 QualType Ty = E->getType();
733 assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
734
735 // Half FP have to be promoted to float unless it is natively supported
736 if (Ty->isHalfType() && !getLangOpts().NativeHalfType)
737 return ImpCastExprToType(Res.get(), Context.FloatTy, CK_FloatingCast);
738
739 // Try to perform integral promotions if the object has a theoretically
740 // promotable type.
741 if (Ty->isIntegralOrUnscopedEnumerationType()) {
742 // C99 6.3.1.1p2:
743 //
744 // The following may be used in an expression wherever an int or
745 // unsigned int may be used:
746 // - an object or expression with an integer type whose integer
747 // conversion rank is less than or equal to the rank of int
748 // and unsigned int.
749 // - A bit-field of type _Bool, int, signed int, or unsigned int.
750 //
751 // If an int can represent all values of the original type, the
752 // value is converted to an int; otherwise, it is converted to an
753 // unsigned int. These are called the integer promotions. All
754 // other types are unchanged by the integer promotions.
755
756 QualType PTy = Context.isPromotableBitField(E);
757 if (!PTy.isNull()) {
758 E = ImpCastExprToType(E, PTy, CK_IntegralCast).get();
759 return E;
760 }
761 if (Ty->isPromotableIntegerType()) {
762 QualType PT = Context.getPromotedIntegerType(Ty);
763 E = ImpCastExprToType(E, PT, CK_IntegralCast).get();
764 return E;
765 }
766 }
767 return E;
768 }
769
770 /// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
771 /// do not have a prototype. Arguments that have type float or __fp16
772 /// are promoted to double. All other argument types are converted by
773 /// UsualUnaryConversions().
774 ExprResult Sema::DefaultArgumentPromotion(Expr *E) {
775 QualType Ty = E->getType();
776 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
777
778 ExprResult Res = UsualUnaryConversions(E);
779 if (Res.isInvalid())
780 return ExprError();
781 E = Res.get();
782
783 // If this is a 'float' or '__fp16' (CVR qualified or typedef)
784 // promote to double.
785 // Note that default argument promotion applies only to float (and
786 // half/fp16); it does not apply to _Float16.
787 const BuiltinType *BTy = Ty->getAs<BuiltinType>();
788 if (BTy && (BTy->getKind() == BuiltinType::Half ||
789 BTy->getKind() == BuiltinType::Float)) {
790 if (getLangOpts().OpenCL &&
791 !getOpenCLOptions().isEnabled("cl_khr_fp64")) {
792 if (BTy->getKind() == BuiltinType::Half) {
793 E = ImpCastExprToType(E, Context.FloatTy, CK_FloatingCast).get();
794 }
795 } else {
796 E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).get();
797 }
798 }
799
800 // C++ performs lvalue-to-rvalue conversion as a default argument
801 // promotion, even on class types, but note:
802 // C++11 [conv.lval]p2:
803 // When an lvalue-to-rvalue conversion occurs in an unevaluated
804 // operand or a subexpression thereof the value contained in the
805 // referenced object is not accessed. Otherwise, if the glvalue
806 // has a class type, the conversion copy-initializes a temporary
807 // of type T from the glvalue and the result of the conversion
808 // is a prvalue for the temporary.
809 // FIXME: add some way to gate this entire thing for correctness in
810 // potentially potentially evaluated contexts.
811 if (getLangOpts().CPlusPlus && E->isGLValue() && !isUnevaluatedContext()) {
812 ExprResult Temp = PerformCopyInitialization(
813 InitializedEntity::InitializeTemporary(E->getType()),
814 E->getExprLoc(), E);
815 if (Temp.isInvalid())
816 return ExprError();
817 E = Temp.get();
818 }
819
820 return E;
821 }
822
823 /// Determine the degree of POD-ness for an expression.
824 /// Incomplete types are considered POD, since this check can be performed
825 /// when we're in an unevaluated context.
826 Sema::VarArgKind Sema::isValidVarArgType(const QualType &Ty) {
827 if (Ty->isIncompleteType()) {
828 // C++11 [expr.call]p7:
829 // After these conversions, if the argument does not have arithmetic,
830 // enumeration, pointer, pointer to member, or class type, the program
831 // is ill-formed.
832 //
833 // Since we've already performed array-to-pointer and function-to-pointer
834 // decay, the only such type in C++ is cv void. This also handles
835 // initializer lists as variadic arguments.
836 if (Ty->isVoidType())
837 return VAK_Invalid;
838
839 if (Ty->isObjCObjectType())
840 return VAK_Invalid;
841 return VAK_Valid;
842 }
843
844 if (Ty.isDestructedType() == QualType::DK_nontrivial_c_struct)
845 return VAK_Invalid;
846
847 if (Ty.isCXX98PODType(Context))
848 return VAK_Valid;
849
850 // C++11 [expr.call]p7:
851 // Passing a potentially-evaluated argument of class type (Clause 9)
852 // having a non-trivial copy constructor, a non-trivial move constructor,
853 // or a non-trivial destructor, with no corresponding parameter,
854 // is conditionally-supported with implementation-defined semantics.
855 if (getLangOpts().CPlusPlus11 && !Ty->isDependentType())
856 if (CXXRecordDecl *Record = Ty->getAsCXXRecordDecl())
857 if (!Record->hasNonTrivialCopyConstructor() &&
858 !Record->hasNonTrivialMoveConstructor() &&
859 !Record->hasNonTrivialDestructor())
860 return VAK_ValidInCXX11;
861
862 if (getLangOpts().ObjCAutoRefCount && Ty->isObjCLifetimeType())
863 return VAK_Valid;
864
865 if (Ty->isObjCObjectType())
866 return VAK_Invalid;
867
868 if (getLangOpts().MSVCCompat)
869 return VAK_MSVCUndefined;
870
871 // FIXME: In C++11, these cases are conditionally-supported, meaning we're
872 // permitted to reject them. We should consider doing so.
873 return VAK_Undefined;
874 }
875
876 void Sema::checkVariadicArgument(const Expr *E, VariadicCallType CT) {
877 // Don't allow one to pass an Objective-C interface to a vararg.
878 const QualType &Ty = E->getType();
879 VarArgKind VAK = isValidVarArgType(Ty);
880
881 // Complain about passing non-POD types through varargs.
882 switch (VAK) {
883 case VAK_ValidInCXX11:
884 DiagRuntimeBehavior(
885 E->getBeginLoc(), nullptr,
886 PDiag(diag::warn_cxx98_compat_pass_non_pod_arg_to_vararg) << Ty << CT);
887 LLVM_FALLTHROUGH;
888 case VAK_Valid:
889 if (Ty->isRecordType()) {
890 // This is unlikely to be what the user intended. If the class has a
891 // 'c_str' member function, the user probably meant to call that.
892 DiagRuntimeBehavior(E->getBeginLoc(), nullptr,
893 PDiag(diag::warn_pass_class_arg_to_vararg)
894 << Ty << CT << hasCStrMethod(E) << ".c_str()");
895 }
896 break;
897
898 case VAK_Undefined:
899 case VAK_MSVCUndefined:
900 DiagRuntimeBehavior(E->getBeginLoc(), nullptr,
901 PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
902 << getLangOpts().CPlusPlus11 << Ty << CT);
903 break;
904
905 case VAK_Invalid:
906 if (Ty.isDestructedType() == QualType::DK_nontrivial_c_struct)
907 Diag(E->getBeginLoc(),
908 diag::err_cannot_pass_non_trivial_c_struct_to_vararg)
909 << Ty << CT;
910 else if (Ty->isObjCObjectType())
911 DiagRuntimeBehavior(E->getBeginLoc(), nullptr,
912 PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
913 << Ty << CT);
914 else
915 Diag(E->getBeginLoc(), diag::err_cannot_pass_to_vararg)
916 << isa<InitListExpr>(E) << Ty << CT;
917 break;
918 }
919 }
920
921 /// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
922 /// will create a trap if the resulting type is not a POD type.
923 ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT,
924 FunctionDecl *FDecl) {
925 if (const BuiltinType *PlaceholderTy = E->getType()->getAsPlaceholderType()) {
926 // Strip the unbridged-cast placeholder expression off, if applicable.
927 if (PlaceholderTy->getKind() == BuiltinType::ARCUnbridgedCast &&
928 (CT == VariadicMethod ||
929 (FDecl && FDecl->hasAttr<CFAuditedTransferAttr>()))) {
930 E = stripARCUnbridgedCast(E);
931
932 // Otherwise, do normal placeholder checking.
933 } else {
934 ExprResult ExprRes = CheckPlaceholderExpr(E);
935 if (ExprRes.isInvalid())
936 return ExprError();
937 E = ExprRes.get();
938 }
939 }
940
941 ExprResult ExprRes = DefaultArgumentPromotion(E);
942 if (ExprRes.isInvalid())
943 return ExprError();
944 E = ExprRes.get();
945
946 // Diagnostics regarding non-POD argument types are
947 // emitted along with format string checking in Sema::CheckFunctionCall().
948 if (isValidVarArgType(E->getType()) == VAK_Undefined) {
949 // Turn this into a trap.
950 CXXScopeSpec SS;
951 SourceLocation TemplateKWLoc;
952 UnqualifiedId Name;
953 Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"),
954 E->getBeginLoc());
955 ExprResult TrapFn = ActOnIdExpression(TUScope, SS, TemplateKWLoc, Name,
956 /*HasTrailingLParen=*/true,
957 /*IsAddressOfOperand=*/false);
958 if (TrapFn.isInvalid())
959 return ExprError();
960
961 ExprResult Call = BuildCallExpr(TUScope, TrapFn.get(), E->getBeginLoc(),
962 None, E->getEndLoc());
963 if (Call.isInvalid())
964 return ExprError();
965
966 ExprResult Comma =
967 ActOnBinOp(TUScope, E->getBeginLoc(), tok::comma, Call.get(), E);
968 if (Comma.isInvalid())
969 return ExprError();
970 return Comma.get();
971 }
972
973 if (!getLangOpts().CPlusPlus &&
974 RequireCompleteType(E->getExprLoc(), E->getType(),
975 diag::err_call_incomplete_argument))
976 return ExprError();
977
978 return E;
979 }
980
981 /// Converts an integer to complex float type. Helper function of
982 /// UsualArithmeticConversions()
983 ///
984 /// \return false if the integer expression is an integer type and is
985 /// successfully converted to the complex type.
986 static bool handleIntegerToComplexFloatConversion(Sema &S, ExprResult &IntExpr,
987 ExprResult &ComplexExpr,
988 QualType IntTy,
989 QualType ComplexTy,
990 bool SkipCast) {
991 if (IntTy->isComplexType() || IntTy->isRealFloatingType()) return true;
992 if (SkipCast) return false;
993 if (IntTy->isIntegerType()) {
994 QualType fpTy = cast<ComplexType>(ComplexTy)->getElementType();
995 IntExpr = S.ImpCastExprToType(IntExpr.get(), fpTy, CK_IntegralToFloating);
996 IntExpr = S.ImpCastExprToType(IntExpr.get(), ComplexTy,
997 CK_FloatingRealToComplex);
998 } else {
999 assert(IntTy->isComplexIntegerType());
1000 IntExpr = S.ImpCastExprToType(IntExpr.get(), ComplexTy,
1001 CK_IntegralComplexToFloatingComplex);
1002 }
1003 return false;
1004 }
1005
1006 /// Handle arithmetic conversion with complex types. Helper function of
1007 /// UsualArithmeticConversions()
1008 static QualType handleComplexFloatConversion(Sema &S, ExprResult &LHS,
1009 ExprResult &RHS, QualType LHSType,
1010 QualType RHSType,
1011 bool IsCompAssign) {
1012 // if we have an integer operand, the result is the complex type.
1013 if (!handleIntegerToComplexFloatConversion(S, RHS, LHS, RHSType, LHSType,
1014 /*skipCast*/false))
1015 return LHSType;
1016 if (!handleIntegerToComplexFloatConversion(S, LHS, RHS, LHSType, RHSType,
1017 /*skipCast*/IsCompAssign))
1018 return RHSType;
1019
1020 // This handles complex/complex, complex/float, or float/complex.
1021 // When both operands are complex, the shorter operand is converted to the
1022 // type of the longer, and that is the type of the result. This corresponds
1023 // to what is done when combining two real floating-point operands.
1024 // The fun begins when size promotion occur across type domains.
1025 // From H&S 6.3.4: When one operand is complex and the other is a real
1026 // floating-point type, the less precise type is converted, within it's
1027 // real or complex domain, to the precision of the other type. For example,
1028 // when combining a "long double" with a "double _Complex", the
1029 // "double _Complex" is promoted to "long double _Complex".
1030
1031 // Compute the rank of the two types, regardless of whether they are complex.
1032 int Order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
1033
1034 auto *LHSComplexType = dyn_cast<ComplexType>(LHSType);
1035 auto *RHSComplexType = dyn_cast<ComplexType>(RHSType);
1036 QualType LHSElementType =
1037 LHSComplexType ? LHSComplexType->getElementType() : LHSType;
1038 QualType RHSElementType =
1039 RHSComplexType ? RHSComplexType->getElementType() : RHSType;
1040
1041 QualType ResultType = S.Context.getComplexType(LHSElementType);
1042 if (Order < 0) {
1043 // Promote the precision of the LHS if not an assignment.
1044 ResultType = S.Context.getComplexType(RHSElementType);
1045 if (!IsCompAssign) {
1046 if (LHSComplexType)
1047 LHS =
1048 S.ImpCastExprToType(LHS.get(), ResultType, CK_FloatingComplexCast);
1049 else
1050 LHS = S.ImpCastExprToType(LHS.get(), RHSElementType, CK_FloatingCast);
1051 }
1052 } else if (Order > 0) {
1053 // Promote the precision of the RHS.
1054 if (RHSComplexType)
1055 RHS = S.ImpCastExprToType(RHS.get(), ResultType, CK_FloatingComplexCast);
1056 else
1057 RHS = S.ImpCastExprToType(RHS.get(), LHSElementType, CK_FloatingCast);
1058 }
1059 return ResultType;
1060 }
1061
1062 /// Handle arithmetic conversion from integer to float. Helper function
1063 /// of UsualArithmeticConversions()
1064 static QualType handleIntToFloatConversion(Sema &S, ExprResult &FloatExpr,
1065 ExprResult &IntExpr,
1066 QualType FloatTy, QualType IntTy,
1067 bool ConvertFloat, bool ConvertInt) {
1068 if (IntTy->isIntegerType()) {
1069 if (ConvertInt)
1070 // Convert intExpr to the lhs floating point type.
1071 IntExpr = S.ImpCastExprToType(IntExpr.get(), FloatTy,
1072 CK_IntegralToFloating);
1073 return FloatTy;
1074 }
1075
1076 // Convert both sides to the appropriate complex float.
1077 assert(IntTy->isComplexIntegerType());
1078 QualType result = S.Context.getComplexType(FloatTy);
1079
1080 // _Complex int -> _Complex float
1081 if (ConvertInt)
1082 IntExpr = S.ImpCastExprToType(IntExpr.get(), result,
1083 CK_IntegralComplexToFloatingComplex);
1084
1085 // float -> _Complex float
1086 if (ConvertFloat)
1087 FloatExpr = S.ImpCastExprToType(FloatExpr.get(), result,
1088 CK_FloatingRealToComplex);
1089
1090 return result;
1091 }
1092
1093 /// Handle arithmethic conversion with floating point types. Helper
1094 /// function of UsualArithmeticConversions()
1095 static QualType handleFloatConversion(Sema &S, ExprResult &LHS,
1096 ExprResult &RHS, QualType LHSType,
1097 QualType RHSType, bool IsCompAssign) {
1098 bool LHSFloat = LHSType->isRealFloatingType();
1099 bool RHSFloat = RHSType->isRealFloatingType();
1100
1101 // If we have two real floating types, convert the smaller operand
1102 // to the bigger result.
1103 if (LHSFloat && RHSFloat) {
1104 int order = S.Context.getFloatingTypeOrder(LHSType, RHSType);
1105 if (order > 0) {
1106 RHS = S.ImpCastExprToType(RHS.get(), LHSType, CK_FloatingCast);
1107 return LHSType;
1108 }
1109
1110 assert(order < 0 && "illegal float comparison");
1111 if (!IsCompAssign)
1112 LHS = S.ImpCastExprToType(LHS.get(), RHSType, CK_FloatingCast);
1113 return RHSType;
1114 }
1115
1116 if (LHSFloat) {
1117 // Half FP has to be promoted to float unless it is natively supported
1118 if (LHSType->isHalfType() && !S.getLangOpts().NativeHalfType)
1119 LHSType = S.Context.FloatTy;
1120
1121 return handleIntToFloatConversion(S, LHS, RHS, LHSType, RHSType,
1122 /*ConvertFloat=*/!IsCompAssign,
1123 /*ConvertInt=*/ true);
1124 }
1125 assert(RHSFloat);
1126 return handleIntToFloatConversion(S, RHS, LHS, RHSType, LHSType,
1127 /*convertInt=*/ true,
1128 /*convertFloat=*/!IsCompAssign);
1129 }
1130
1131 /// Diagnose attempts to convert between __float128 and long double if
1132 /// there is no support for such conversion. Helper function of
1133 /// UsualArithmeticConversions().
1134 static bool unsupportedTypeConversion(const Sema &S, QualType LHSType,
1135 QualType RHSType) {
1136 /* No issue converting if at least one of the types is not a floating point
1137 type or the two types have the same rank.
1138 */
1139 if (!LHSType->isFloatingType() || !RHSType->isFloatingType() ||
1140 S.Context.getFloatingTypeOrder(LHSType, RHSType) == 0)
1141 return false;
1142
1143 assert(LHSType->isFloatingType() && RHSType->isFloatingType() &&
1144 "The remaining types must be floating point types.");
1145
1146 auto *LHSComplex = LHSType->getAs<ComplexType>();
1147 auto *RHSComplex = RHSType->getAs<ComplexType>();
1148
1149 QualType LHSElemType = LHSComplex ?
1150 LHSComplex->getElementType() : LHSType;
1151 QualType RHSElemType = RHSComplex ?
1152 RHSComplex->getElementType() : RHSType;
1153
1154 // No issue if the two types have the same representation
1155 if (&S.Context.getFloatTypeSemantics(LHSElemType) ==
1156 &S.Context.getFloatTypeSemantics(RHSElemType))
1157 return false;
1158
1159 bool Float128AndLongDouble = (LHSElemType == S.Context.Float128Ty &&
1160 RHSElemType == S.Context.LongDoubleTy);
1161 Float128AndLongDouble |= (LHSElemType == S.Context.LongDoubleTy &&
1162 RHSElemType == S.Context.Float128Ty);
1163
1164 // We've handled the situation where __float128 and long double have the same
1165 // representation. We allow all conversions for all possible long double types
1166 // except PPC's double double.
1167 return Float128AndLongDouble &&
1168 (&S.Context.getFloatTypeSemantics(S.Context.LongDoubleTy) ==
1169 &llvm::APFloat::PPCDoubleDouble());
1170 }
1171
1172 typedef ExprResult PerformCastFn(Sema &S, Expr *operand, QualType toType);
1173
1174 namespace {
1175 /// These helper callbacks are placed in an anonymous namespace to
1176 /// permit their use as function template parameters.
1177 ExprResult doIntegralCast(Sema &S, Expr *op, QualType toType) {
1178 return S.ImpCastExprToType(op, toType, CK_IntegralCast);
1179 }
1180
1181 ExprResult doComplexIntegralCast(Sema &S, Expr *op, QualType toType) {
1182 return S.ImpCastExprToType(op, S.Context.getComplexType(toType),
1183 CK_IntegralComplexCast);
1184 }
1185 }
1186
1187 /// Handle integer arithmetic conversions. Helper function of
1188 /// UsualArithmeticConversions()
1189 template <PerformCastFn doLHSCast, PerformCastFn doRHSCast>
1190 static QualType handleIntegerConversion(Sema &S, ExprResult &LHS,
1191 ExprResult &RHS, QualType LHSType,
1192 QualType RHSType, bool IsCompAssign) {
1193 // The rules for this case are in C99 6.3.1.8
1194 int order = S.Context.getIntegerTypeOrder(LHSType, RHSType);
1195 bool LHSSigned = LHSType->hasSignedIntegerRepresentation();
1196 bool RHSSigned = RHSType->hasSignedIntegerRepresentation();
1197 if (LHSSigned == RHSSigned) {
1198 // Same signedness; use the higher-ranked type
1199 if (order >= 0) {
1200 RHS = (*doRHSCast)(S, RHS.get(), LHSType);
1201 return LHSType;
1202 } else if (!IsCompAssign)
1203 LHS = (*doLHSCast)(S, LHS.get(), RHSType);
1204 return RHSType;
1205 } else if (order != (LHSSigned ? 1 : -1)) {
1206 // The unsigned type has greater than or equal rank to the
1207 // signed type, so use the unsigned type
1208 if (RHSSigned) {
1209 RHS = (*doRHSCast)(S, RHS.get(), LHSType);
1210 return LHSType;
1211 } else if (!IsCompAssign)
1212 LHS = (*doLHSCast)(S, LHS.get(), RHSType);
1213 return RHSType;
1214 } else if (S.Context.getIntWidth(LHSType) != S.Context.getIntWidth(RHSType)) {
1215 // The two types are different widths; if we are here, that
1216 // means the signed type is larger than the unsigned type, so
1217 // use the signed type.
1218 if (LHSSigned) {
1219 RHS = (*doRHSCast)(S, RHS.get(), LHSType);
1220 return LHSType;
1221 } else if (!IsCompAssign)
1222 LHS = (*doLHSCast)(S, LHS.get(), RHSType);
1223 return RHSType;
1224 } else {
1225 // The signed type is higher-ranked than the unsigned type,
1226 // but isn't actually any bigger (like unsigned int and long
1227 // on most 32-bit systems). Use the unsigned type corresponding
1228 // to the signed type.
1229 QualType result =
1230 S.Context.getCorrespondingUnsignedType(LHSSigned ? LHSType : RHSType);
1231 RHS = (*doRHSCast)(S, RHS.get(), result);
1232 if (!IsCompAssign)
1233 LHS = (*doLHSCast)(S, LHS.get(), result);
1234 return result;
1235 }
1236 }
1237
1238 /// Handle conversions with GCC complex int extension. Helper function
1239 /// of UsualArithmeticConversions()
1240 static QualType handleComplexIntConversion(Sema &S, ExprResult &LHS,
1241 ExprResult &RHS, QualType LHSType,
1242 QualType RHSType,
1243 bool IsCompAssign) {
1244 const ComplexType *LHSComplexInt = LHSType->getAsComplexIntegerType();
1245 const ComplexType *RHSComplexInt = RHSType->getAsComplexIntegerType();
1246
1247 if (LHSComplexInt && RHSComplexInt) {
1248 QualType LHSEltType = LHSComplexInt->getElementType();
1249 QualType RHSEltType = RHSComplexInt->getElementType();
1250 QualType ScalarType =
1251 handleIntegerConversion<doComplexIntegralCast, doComplexIntegralCast>
1252 (S, LHS, RHS, LHSEltType, RHSEltType, IsCompAssign);
1253
1254 return S.Context.getComplexType(ScalarType);
1255 }
1256
1257 if (LHSComplexInt) {
1258 QualType LHSEltType = LHSComplexInt->getElementType();
1259 QualType ScalarType =
1260 handleIntegerConversion<doComplexIntegralCast, doIntegralCast>
1261 (S, LHS, RHS, LHSEltType, RHSType, IsCompAssign);
1262 QualType ComplexType = S.Context.getComplexType(ScalarType);
1263 RHS = S.ImpCastExprToType(RHS.get(), ComplexType,
1264 CK_IntegralRealToComplex);
1265
1266 return ComplexType;
1267 }
1268
1269 assert(RHSComplexInt);
1270
1271 QualType RHSEltType = RHSComplexInt->getElementType();
1272 QualType ScalarType =
1273 handleIntegerConversion<doIntegralCast, doComplexIntegralCast>
1274 (S, LHS, RHS, LHSType, RHSEltType, IsCompAssign);
1275 QualType ComplexType = S.Context.getComplexType(ScalarType);
1276
1277 if (!IsCompAssign)
1278 LHS = S.ImpCastExprToType(LHS.get(), ComplexType,
1279 CK_IntegralRealToComplex);
1280 return ComplexType;
1281 }
1282
1283 /// Return the rank of a given fixed point or integer type. The value itself
1284 /// doesn't matter, but the values must be increasing with proper increasing
1285 /// rank as described in N1169 4.1.1.
1286 static unsigned GetFixedPointRank(QualType Ty) {
1287 const auto *BTy = Ty->getAs<BuiltinType>();
1288 assert(BTy && "Expected a builtin type.");
1289
1290 switch (BTy->getKind()) {
1291 case BuiltinType::ShortFract:
1292 case BuiltinType::UShortFract:
1293 case BuiltinType::SatShortFract:
1294 case BuiltinType::SatUShortFract:
1295 return 1;
1296 case BuiltinType::Fract:
1297 case BuiltinType::UFract:
1298 case BuiltinType::SatFract:
1299 case BuiltinType::SatUFract:
1300 return 2;
1301 case BuiltinType::LongFract:
1302 case BuiltinType::ULongFract:
1303 case BuiltinType::SatLongFract:
1304 case BuiltinType::SatULongFract:
1305 return 3;
1306 case BuiltinType::ShortAccum:
1307 case BuiltinType::UShortAccum:
1308 case BuiltinType::SatShortAccum:
1309 case BuiltinType::SatUShortAccum:
1310 return 4;
1311 case BuiltinType::Accum:
1312 case BuiltinType::UAccum:
1313 case BuiltinType::SatAccum:
1314 case BuiltinType::SatUAccum:
1315 return 5;
1316 case BuiltinType::LongAccum:
1317 case BuiltinType::ULongAccum:
1318 case BuiltinType::SatLongAccum:
1319 case BuiltinType::SatULongAccum:
1320 return 6;
1321 default:
1322 if (BTy->isInteger())
1323 return 0;
1324 llvm_unreachable("Unexpected fixed point or integer type");
1325 }
1326 }
1327
1328 /// handleFixedPointConversion - Fixed point operations between fixed
1329 /// point types and integers or other fixed point types do not fall under
1330 /// usual arithmetic conversion since these conversions could result in loss
1331 /// of precsision (N1169 4.1.4). These operations should be calculated with
1332 /// the full precision of their result type (N1169 4.1.6.2.1).
1333 static QualType handleFixedPointConversion(Sema &S, QualType LHSTy,
1334 QualType RHSTy) {
1335 assert((LHSTy->isFixedPointType() || RHSTy->isFixedPointType()) &&
1336 "Expected at least one of the operands to be a fixed point type");
1337 assert((LHSTy->isFixedPointOrIntegerType() ||
1338 RHSTy->isFixedPointOrIntegerType()) &&
1339 "Special fixed point arithmetic operation conversions are only "
1340 "applied to ints or other fixed point types");
1341
1342 // If one operand has signed fixed-point type and the other operand has
1343 // unsigned fixed-point type, then the unsigned fixed-point operand is
1344 // converted to its corresponding signed fixed-point type and the resulting
1345 // type is the type of the converted operand.
1346 if (RHSTy->isSignedFixedPointType() && LHSTy->isUnsignedFixedPointType())
1347 LHSTy = S.Context.getCorrespondingSignedFixedPointType(LHSTy);
1348 else if (RHSTy->isUnsignedFixedPointType() && LHSTy->isSignedFixedPointType())
1349 RHSTy = S.Context.getCorrespondingSignedFixedPointType(RHSTy);
1350
1351 // The result type is the type with the highest rank, whereby a fixed-point
1352 // conversion rank is always greater than an integer conversion rank; if the
1353 // type of either of the operands is a saturating fixedpoint type, the result
1354 // type shall be the saturating fixed-point type corresponding to the type
1355 // with the highest rank; the resulting value is converted (taking into
1356 // account rounding and overflow) to the precision of the resulting type.
1357 // Same ranks between signed and unsigned types are resolved earlier, so both
1358 // types are either signed or both unsigned at this point.
1359 unsigned LHSTyRank = GetFixedPointRank(LHSTy);
1360 unsigned RHSTyRank = GetFixedPointRank(RHSTy);
1361
1362 QualType ResultTy = LHSTyRank > RHSTyRank ? LHSTy : RHSTy;
1363
1364 if (LHSTy->isSaturatedFixedPointType() || RHSTy->isSaturatedFixedPointType())
1365 ResultTy = S.Context.getCorrespondingSaturatedType(ResultTy);
1366
1367 return ResultTy;
1368 }
1369
1370 /// Check that the usual arithmetic conversions can be performed on this pair of
1371 /// expressions that might be of enumeration type.
1372 static void checkEnumArithmeticConversions(Sema &S, Expr *LHS, Expr *RHS,
1373 SourceLocation Loc,
1374 Sema::ArithConvKind ACK) {
1375 // C++2a [expr.arith.conv]p1:
1376 // If one operand is of enumeration type and the other operand is of a
1377 // different enumeration type or a floating-point type, this behavior is
1378 // deprecated ([depr.arith.conv.enum]).
1379 //
1380 // Warn on this in all language modes. Produce a deprecation warning in C++20.
1381 // Eventually we will presumably reject these cases (in C++23 onwards?).
1382 QualType L = LHS->getType(), R = RHS->getType();
1383 bool LEnum = L->isUnscopedEnumerationType(),
1384 REnum = R->isUnscopedEnumerationType();
1385 bool IsCompAssign = ACK == Sema::ACK_CompAssign;
1386 if ((!IsCompAssign && LEnum && R->isFloatingType()) ||
1387 (REnum && L->isFloatingType())) {
1388 S.Diag(Loc, S.getLangOpts().CPlusPlus2a
1389 ? diag::warn_arith_conv_enum_float_cxx2a
1390 : diag::warn_arith_conv_enum_float)
1391 << LHS->getSourceRange() << RHS->getSourceRange()
1392 << (int)ACK << LEnum << L << R;
1393 } else if (!IsCompAssign && LEnum && REnum &&
1394 !S.Context.hasSameUnqualifiedType(L, R)) {
1395 unsigned DiagID;
1396 if (!L->castAs<EnumType>()->getDecl()->hasNameForLinkage() ||
1397 !R->castAs<EnumType>()->getDecl()->hasNameForLinkage()) {
1398 // If either enumeration type is unnamed, it's less likely that the
1399 // user cares about this, but this situation is still deprecated in
1400 // C++2a. Use a different warning group.
1401 DiagID = S.getLangOpts().CPlusPlus2a
1402 ? diag::warn_arith_conv_mixed_anon_enum_types_cxx2a
1403 : diag::warn_arith_conv_mixed_anon_enum_types;
1404 } else if (ACK == Sema::ACK_Conditional) {
1405 // Conditional expressions are separated out because they have
1406 // historically had a different warning flag.
1407 DiagID = S.getLangOpts().CPlusPlus2a
1408 ? diag::warn_conditional_mixed_enum_types_cxx2a
1409 : diag::warn_conditional_mixed_enum_types;
1410 } else if (ACK == Sema::ACK_Comparison) {
1411 // Comparison expressions are separated out because they have
1412 // historically had a different warning flag.
1413 DiagID = S.getLangOpts().CPlusPlus2a
1414 ? diag::warn_comparison_mixed_enum_types_cxx2a
1415 : diag::warn_comparison_mixed_enum_types;
1416 } else {
1417 DiagID = S.getLangOpts().CPlusPlus2a
1418 ? diag::warn_arith_conv_mixed_enum_types_cxx2a
1419 : diag::warn_arith_conv_mixed_enum_types;
1420 }
1421 S.Diag(Loc, DiagID) << LHS->getSourceRange() << RHS->getSourceRange()
1422 << (int)ACK << L << R;
1423 }
1424 }
1425
1426 /// UsualArithmeticConversions - Performs various conversions that are common to
1427 /// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
1428 /// routine returns the first non-arithmetic type found. The client is
1429 /// responsible for emitting appropriate error diagnostics.
1430 QualType Sema::UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS,
1431 SourceLocation Loc,
1432 ArithConvKind ACK) {
1433 checkEnumArithmeticConversions(*this, LHS.get(), RHS.get(), Loc, ACK);
1434
1435 if (ACK != ACK_CompAssign) {
1436 LHS = UsualUnaryConversions(LHS.get());
1437 if (LHS.isInvalid())
1438 return QualType();
1439 }
1440
1441 RHS = UsualUnaryConversions(RHS.get());
1442 if (RHS.isInvalid())
1443 return QualType();
1444
1445 // For conversion purposes, we ignore any qualifiers.
1446 // For example, "const float" and "float" are equivalent.
1447 QualType LHSType =
1448 Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
1449 QualType RHSType =
1450 Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
1451
1452 // For conversion purposes, we ignore any atomic qualifier on the LHS.
1453 if (const AtomicType *AtomicLHS = LHSType->getAs<AtomicType>())
1454 LHSType = AtomicLHS->getValueType();
1455
1456 // If both types are identical, no conversion is needed.
1457 if (LHSType == RHSType)
1458 return LHSType;
1459
1460 // If either side is a non-arithmetic type (e.g. a pointer), we are done.
1461 // The caller can deal with this (e.g. pointer + int).
1462 if (!LHSType->isArithmeticType() || !RHSType->isArithmeticType())
1463 return QualType();
1464
1465 // Apply unary and bitfield promotions to the LHS's type.
1466 QualType LHSUnpromotedType = LHSType;
1467 if (LHSType->isPromotableIntegerType())
1468 LHSType = Context.getPromotedIntegerType(LHSType);
1469 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(LHS.get());
1470 if (!LHSBitfieldPromoteTy.isNull())
1471 LHSType = LHSBitfieldPromoteTy;
1472 if (LHSType != LHSUnpromotedType && ACK != ACK_CompAssign)
1473 LHS = ImpCastExprToType(LHS.get(), LHSType, CK_IntegralCast);
1474
1475 // If both types are identical, no conversion is needed.
1476 if (LHSType == RHSType)
1477 return LHSType;
1478
1479 // At this point, we have two different arithmetic types.
1480
1481 // Diagnose attempts to convert between __float128 and long double where
1482 // such conversions currently can't be handled.
1483 if (unsupportedTypeConversion(*this, LHSType, RHSType))
1484 return QualType();
1485
1486 // Handle complex types first (C99 6.3.1.8p1).
1487 if (LHSType->isComplexType() || RHSType->isComplexType())
1488 return handleComplexFloatConversion(*this, LHS, RHS, LHSType, RHSType,
1489 ACK == ACK_CompAssign);
1490
1491 // Now handle "real" floating types (i.e. float, double, long double).
1492 if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
1493 return handleFloatConversion(*this, LHS, RHS, LHSType, RHSType,
1494 ACK == ACK_CompAssign);
1495
1496 // Handle GCC complex int extension.
1497 if (LHSType->isComplexIntegerType() || RHSType->isComplexIntegerType())
1498 return handleComplexIntConversion(*this, LHS, RHS, LHSType, RHSType,
1499 ACK == ACK_CompAssign);
1500
1501 if (LHSType->isFixedPointType() || RHSType->isFixedPointType())
1502 return handleFixedPointConversion(*this, LHSType, RHSType);
1503
1504 // Finally, we have two differing integer types.
1505 return handleIntegerConversion<doIntegralCast, doIntegralCast>
1506 (*this, LHS, RHS, LHSType, RHSType, ACK == ACK_CompAssign);
1507 }
1508
1509 //===----------------------------------------------------------------------===//
1510 // Semantic Analysis for various Expression Types
1511 //===----------------------------------------------------------------------===//
1512
1513
1514 ExprResult
1515 Sema::ActOnGenericSelectionExpr(SourceLocation KeyLoc,
1516 SourceLocation DefaultLoc,
1517 SourceLocation RParenLoc,
1518 Expr *ControllingExpr,
1519 ArrayRef<ParsedType> ArgTypes,
1520 ArrayRef<Expr *> ArgExprs) {
1521 unsigned NumAssocs = ArgTypes.size();
1522 assert(NumAssocs == ArgExprs.size());
1523
1524 TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs];
1525 for (unsigned i = 0; i < NumAssocs; ++i) {
1526 if (ArgTypes[i])
1527 (void) GetTypeFromParser(ArgTypes[i], &Types[i]);
1528 else
1529 Types[i] = nullptr;
1530 }
1531
1532 ExprResult ER = CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc,
1533 ControllingExpr,
1534 llvm::makeArrayRef(Types, NumAssocs),
1535 ArgExprs);
1536 delete [] Types;
1537 return ER;
1538 }
1539
1540 ExprResult
1541 Sema::CreateGenericSelectionExpr(SourceLocation KeyLoc,
1542 SourceLocation DefaultLoc,
1543 SourceLocation RParenLoc,
1544 Expr *ControllingExpr,
1545 ArrayRef<TypeSourceInfo *> Types,
1546 ArrayRef<Expr *> Exprs) {
1547 unsigned NumAssocs = Types.size();
1548 assert(NumAssocs == Exprs.size());
1549
1550 // Decay and strip qualifiers for the controlling expression type, and handle
1551 // placeholder type replacement. See committee discussion from WG14 DR423.
1552 {
1553 EnterExpressionEvaluationContext Unevaluated(
1554 *this, Sema::ExpressionEvaluationContext::Unevaluated);
1555 ExprResult R = DefaultFunctionArrayLvalueConversion(ControllingExpr);
1556 if (R.isInvalid())
1557 return ExprError();
1558 ControllingExpr = R.get();
1559 }
1560
1561 // The controlling expression is an unevaluated operand, so side effects are
1562 // likely unintended.
1563 if (!inTemplateInstantiation() &&
1564 ControllingExpr->HasSideEffects(Context, false))
1565 Diag(ControllingExpr->getExprLoc(),
1566 diag::warn_side_effects_unevaluated_context);
1567
1568 bool TypeErrorFound = false,
1569 IsResultDependent = ControllingExpr->isTypeDependent(),
1570 ContainsUnexpandedParameterPack
1571 = ControllingExpr->containsUnexpandedParameterPack();
1572
1573 for (unsigned i = 0; i < NumAssocs; ++i) {
1574 if (Exprs[i]->containsUnexpandedParameterPack())
1575 ContainsUnexpandedParameterPack = true;
1576
1577 if (Types[i]) {
1578 if (Types[i]->getType()->containsUnexpandedParameterPack())
1579 ContainsUnexpandedParameterPack = true;
1580
1581 if (Types[i]->getType()->isDependentType()) {
1582 IsResultDependent = true;
1583 } else {
1584 // C11 6.5.1.1p2 "The type name in a generic association shall specify a
1585 // complete object type other than a variably modified type."
1586 unsigned D = 0;
1587 if (Types[i]->getType()->isIncompleteType())
1588 D = diag::err_assoc_type_incomplete;
1589 else if (!Types[i]->getType()->isObjectType())
1590 D = diag::err_assoc_type_nonobject;
1591 else if (Types[i]->getType()->isVariablyModifiedType())
1592 D = diag::err_assoc_type_variably_modified;
1593
1594 if (D != 0) {
1595 Diag(Types[i]->getTypeLoc().getBeginLoc(), D)
1596 << Types[i]->getTypeLoc().getSourceRange()
1597 << Types[i]->getType();
1598 TypeErrorFound = true;
1599 }
1600
1601 // C11 6.5.1.1p2 "No two generic associations in the same generic
1602 // selection shall specify compatible types."
1603 for (unsigned j = i+1; j < NumAssocs; ++j)
1604 if (Types[j] && !Types[j]->getType()->isDependentType() &&
1605 Context.typesAreCompatible(Types[i]->getType(),
1606 Types[j]->getType())) {
1607 Diag(Types[j]->getTypeLoc().getBeginLoc(),
1608 diag::err_assoc_compatible_types)
1609 << Types[j]->getTypeLoc().getSourceRange()
1610 << Types[j]->getType()
1611 << Types[i]->getType();
1612 Diag(Types[i]->getTypeLoc().getBeginLoc(),
1613 diag::note_compat_assoc)
1614 << Types[i]->getTypeLoc().getSourceRange()
1615 << Types[i]->getType();
1616 TypeErrorFound = true;
1617 }
1618 }
1619 }
1620 }
1621 if (TypeErrorFound)
1622 return ExprError();
1623
1624 // If we determined that the generic selection is result-dependent, don't
1625 // try to compute the result expression.
1626 if (IsResultDependent)
1627 return GenericSelectionExpr::Create(Context, KeyLoc, ControllingExpr, Types,
1628 Exprs, DefaultLoc, RParenLoc,
1629 ContainsUnexpandedParameterPack);
1630
1631 SmallVector<unsigned, 1> CompatIndices;
1632 unsigned DefaultIndex = -1U;
1633 for (unsigned i = 0; i < NumAssocs; ++i) {
1634 if (!Types[i])
1635 DefaultIndex = i;
1636 else if (Context.typesAreCompatible(ControllingExpr->getType(),
1637 Types[i]->getType()))
1638 CompatIndices.push_back(i);
1639 }
1640
1641 // C11 6.5.1.1p2 "The controlling expression of a generic selection shall have
1642 // type compatible with at most one of the types named in its generic
1643 // association list."
1644 if (CompatIndices.size() > 1) {
1645 // We strip parens here because the controlling expression is typically
1646 // parenthesized in macro definitions.
1647 ControllingExpr = ControllingExpr->IgnoreParens();
1648 Diag(ControllingExpr->getBeginLoc(), diag::err_generic_sel_multi_match)
1649 << ControllingExpr->getSourceRange() << ControllingExpr->getType()
1650 << (unsigned)CompatIndices.size();
1651 for (unsigned I : CompatIndices) {
1652 Diag(Types[I]->getTypeLoc().getBeginLoc(),
1653 diag::note_compat_assoc)
1654 << Types[I]->getTypeLoc().getSourceRange()
1655 << Types[I]->getType();
1656 }
1657 return ExprError();
1658 }
1659
1660 // C11 6.5.1.1p2 "If a generic selection has no default generic association,
1661 // its controlling expression shall have type compatible with exactly one of
1662 // the types named in its generic association list."
1663 if (DefaultIndex == -1U && CompatIndices.size() == 0) {
1664 // We strip parens here because the controlling expression is typically
1665 // parenthesized in macro definitions.
1666 ControllingExpr = ControllingExpr->IgnoreParens();
1667 Diag(ControllingExpr->getBeginLoc(), diag::err_generic_sel_no_match)
1668 << ControllingExpr->getSourceRange() << ControllingExpr->getType();
1669 return ExprError();
1670 }
1671
1672 // C11 6.5.1.1p3 "If a generic selection has a generic association with a
1673 // type name that is compatible with the type of the controlling expression,
1674 // then the result expression of the generic selection is the expression
1675 // in that generic association. Otherwise, the result expression of the
1676 // generic selection is the expression in the default generic association."
1677 unsigned ResultIndex =
1678 CompatIndices.size() ? CompatIndices[0] : DefaultIndex;
1679
1680 return GenericSelectionExpr::Create(
1681 Context, KeyLoc, ControllingExpr, Types, Exprs, DefaultLoc, RParenLoc,
1682 ContainsUnexpandedParameterPack, ResultIndex);
1683 }
1684
1685 /// getUDSuffixLoc - Create a SourceLocation for a ud-suffix, given the
1686 /// location of the token and the offset of the ud-suffix within it.
1687 static SourceLocation getUDSuffixLoc(Sema &S, SourceLocation TokLoc,
1688 unsigned Offset) {
1689 return Lexer::AdvanceToTokenCharacter(TokLoc, Offset, S.getSourceManager(),
1690 S.getLangOpts());
1691 }
1692
1693 /// BuildCookedLiteralOperatorCall - A user-defined literal was found. Look up
1694 /// the corresponding cooked (non-raw) literal operator, and build a call to it.
1695 static ExprResult BuildCookedLiteralOperatorCall(Sema &S, Scope *Scope,
1696 IdentifierInfo *UDSuffix,
1697 SourceLocation UDSuffixLoc,
1698 ArrayRef<Expr*> Args,
1699 SourceLocation LitEndLoc) {
1700 assert(Args.size() <= 2 && "too many arguments for literal operator");
1701
1702 QualType ArgTy[2];
1703 for (unsigned ArgIdx = 0; ArgIdx != Args.size(); ++ArgIdx) {
1704 ArgTy[ArgIdx] = Args[ArgIdx]->getType();
1705 if (ArgTy[ArgIdx]->isArrayType())
1706 ArgTy[ArgIdx] = S.Context.getArrayDecayedType(ArgTy[ArgIdx]);
1707 }
1708
1709 DeclarationName OpName =
1710 S.Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
1711 DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
1712 OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
1713
1714 LookupResult R(S, OpName, UDSuffixLoc, Sema::LookupOrdinaryName);
1715 if (S.LookupLiteralOperator(Scope, R, llvm::makeArrayRef(ArgTy, Args.size()),
1716 /*AllowRaw*/ false, /*AllowTemplate*/ false,
1717 /*AllowStringTemplate*/ false,
1718 /*DiagnoseMissing*/ true) == Sema::LOLR_Error)
1719 return ExprError();
1720
1721 return S.BuildLiteralOperatorCall(R, OpNameInfo, Args, LitEndLoc);
1722 }
1723
1724 /// ActOnStringLiteral - The specified tokens were lexed as pasted string
1725 /// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string
1726 /// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
1727 /// multiple tokens. However, the common case is that StringToks points to one
1728 /// string.
1729 ///
1730 ExprResult
1731 Sema::ActOnStringLiteral(ArrayRef<Token> StringToks, Scope *UDLScope) {
1732 assert(!StringToks.empty() && "Must have at least one string!");
1733
1734 StringLiteralParser Literal(StringToks, PP);
1735 if (Literal.hadError)
1736 return ExprError();
1737
1738 SmallVector<SourceLocation, 4> StringTokLocs;
1739 for (const Token &Tok : StringToks)
1740 StringTokLocs.push_back(Tok.getLocation());
1741
1742 QualType CharTy = Context.CharTy;
1743 StringLiteral::StringKind Kind = StringLiteral::Ascii;
1744 if (Literal.isWide()) {
1745 CharTy = Context.getWideCharType();
1746 Kind = StringLiteral::Wide;
1747 } else if (Literal.isUTF8()) {
1748 if (getLangOpts().Char8)
1749 CharTy = Context.Char8Ty;
1750 Kind = StringLiteral::UTF8;
1751 } else if (Literal.isUTF16()) {
1752 CharTy = Context.Char16Ty;
1753 Kind = StringLiteral::UTF16;
1754 } else if (Literal.isUTF32()) {
1755 CharTy = Context.Char32Ty;
1756 Kind = StringLiteral::UTF32;
1757 } else if (Literal.isPascal()) {
1758 CharTy = Context.UnsignedCharTy;
1759 }
1760
1761 // Warn on initializing an array of char from a u8 string literal; this
1762 // becomes ill-formed in C++2a.
1763 if (getLangOpts().CPlusPlus && !getLangOpts().CPlusPlus2a &&
1764 !getLangOpts().Char8 && Kind == StringLiteral::UTF8) {
1765 Diag(StringTokLocs.front(), diag::warn_cxx2a_compat_utf8_string);
1766
1767 // Create removals for all 'u8' prefixes in the string literal(s). This
1768 // ensures C++2a compatibility (but may change the program behavior when
1769 // built by non-Clang compilers for which the execution character set is
1770 // not always UTF-8).
1771 auto RemovalDiag = PDiag(diag::note_cxx2a_compat_utf8_string_remove_u8);
1772 SourceLocation RemovalDiagLoc;
1773 for (const Token &Tok : StringToks) {
1774 if (Tok.getKind() == tok::utf8_string_literal) {
1775 if (RemovalDiagLoc.isInvalid())
1776 RemovalDiagLoc = Tok.getLocation();
1777 RemovalDiag << FixItHint::CreateRemoval(CharSourceRange::getCharRange(
1778 Tok.getLocation(),
1779 Lexer::AdvanceToTokenCharacter(Tok.getLocation(), 2,
1780 getSourceManager(), getLangOpts())));
1781 }
1782 }
1783 Diag(RemovalDiagLoc, RemovalDiag);
1784 }
1785
1786 QualType StrTy =
1787 Context.getStringLiteralArrayType(CharTy, Literal.GetNumStringChars());
1788
1789 // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
1790 StringLiteral *Lit = StringLiteral::Create(Context, Literal.GetString(),
1791 Kind, Literal.Pascal, StrTy,
1792 &StringTokLocs[0],
1793 StringTokLocs.size());
1794 if (Literal.getUDSuffix().empty())
1795 return Lit;
1796
1797 // We're building a user-defined literal.
1798 IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
1799 SourceLocation UDSuffixLoc =
1800 getUDSuffixLoc(*this, StringTokLocs[Literal.getUDSuffixToken()],
1801 Literal.getUDSuffixOffset());
1802
1803 // Make sure we're allowed user-defined literals here.
1804 if (!UDLScope)
1805 return ExprError(Diag(UDSuffixLoc, diag::err_invalid_string_udl));
1806
1807 // C++11 [lex.ext]p5: The literal L is treated as a call of the form
1808 // operator "" X (str, len)
1809 QualType SizeType = Context.getSizeType();
1810
1811 DeclarationName OpName =
1812 Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
1813 DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
1814 OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
1815
1816 QualType ArgTy[] = {
1817 Context.getArrayDecayedType(StrTy), SizeType
1818 };
1819
1820 LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName);
1821 switch (LookupLiteralOperator(UDLScope, R, ArgTy,
1822 /*AllowRaw*/ false, /*AllowTemplate*/ false,
1823 /*AllowStringTemplate*/ true,
1824 /*DiagnoseMissing*/ true)) {
1825
1826 case LOLR_Cooked: {
1827 llvm::APInt Len(Context.getIntWidth(SizeType), Literal.GetNumStringChars());
1828 IntegerLiteral *LenArg = IntegerLiteral::Create(Context, Len, SizeType,
1829 StringTokLocs[0]);
1830 Expr *Args[] = { Lit, LenArg };
1831
1832 return BuildLiteralOperatorCall(R, OpNameInfo, Args, StringTokLocs.back());
1833 }
1834
1835 case LOLR_StringTemplate: {
1836 TemplateArgumentListInfo ExplicitArgs;
1837
1838 unsigned CharBits = Context.getIntWidth(CharTy);
1839 bool CharIsUnsigned = CharTy->isUnsignedIntegerType();
1840 llvm::APSInt Value(CharBits, CharIsUnsigned);
1841
1842 TemplateArgument TypeArg(CharTy);
1843 TemplateArgumentLocInfo TypeArgInfo(Context.getTrivialTypeSourceInfo(CharTy));
1844 ExplicitArgs.addArgument(TemplateArgumentLoc(TypeArg, TypeArgInfo));
1845
1846 for (unsigned I = 0, N = Lit->getLength(); I != N; ++I) {
1847 Value = Lit->getCodeUnit(I);
1848 TemplateArgument Arg(Context, Value, CharTy);
1849 TemplateArgumentLocInfo ArgInfo;
1850 ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo));
1851 }
1852 return BuildLiteralOperatorCall(R, OpNameInfo, None, StringTokLocs.back(),
1853 &ExplicitArgs);
1854 }
1855 case LOLR_Raw:
1856 case LOLR_Template:
1857 case LOLR_ErrorNoDiagnostic:
1858 llvm_unreachable("unexpected literal operator lookup result");
1859 case LOLR_Error:
1860 return ExprError();
1861 }
1862 llvm_unreachable("unexpected literal operator lookup result");
1863 }
1864
1865 DeclRefExpr *
1866 Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
1867 SourceLocation Loc,
1868 const CXXScopeSpec *SS) {
1869 DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
1870 return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
1871 }
1872
1873 DeclRefExpr *
1874 Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
1875 const DeclarationNameInfo &NameInfo,
1876 const CXXScopeSpec *SS, NamedDecl *FoundD,
1877 SourceLocation TemplateKWLoc,
1878 const TemplateArgumentListInfo *TemplateArgs) {
1879 NestedNameSpecifierLoc NNS =
1880 SS ? SS->getWithLocInContext(Context) : NestedNameSpecifierLoc();
1881 return BuildDeclRefExpr(D, Ty, VK, NameInfo, NNS, FoundD, TemplateKWLoc,
1882 TemplateArgs);
1883 }
1884
1885 NonOdrUseReason Sema::getNonOdrUseReasonInCurrentContext(ValueDecl *D) {
1886 // A declaration named in an unevaluated operand never constitutes an odr-use.
1887 if (isUnevaluatedContext())
1888 return NOUR_Unevaluated;
1889
1890 // C++2a [basic.def.odr]p4:
1891 // A variable x whose name appears as a potentially-evaluated expression e
1892 // is odr-used by e unless [...] x is a reference that is usable in
1893 // constant expressions.
1894 if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
1895 if (VD->getType()->isReferenceType() &&
1896 !(getLangOpts().OpenMP && isOpenMPCapturedDecl(D)) &&
1897 VD->isUsableInConstantExpressions(Context))
1898 return NOUR_Constant;
1899 }
1900
1901 // All remaining non-variable cases constitute an odr-use. For variables, we
1902 // need to wait and see how the expression is used.
1903 return NOUR_None;
1904 }
1905
1906 /// BuildDeclRefExpr - Build an expression that references a
1907 /// declaration that does not require a closure capture.
1908 DeclRefExpr *
1909 Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
1910 const DeclarationNameInfo &NameInfo,
1911 NestedNameSpecifierLoc NNS, NamedDecl *FoundD,
1912 SourceLocation TemplateKWLoc,
1913 const TemplateArgumentListInfo *TemplateArgs) {
1914 bool RefersToCapturedVariable =
1915 isa<VarDecl>(D) &&
1916 NeedToCaptureVariable(cast<VarDecl>(D), NameInfo.getLoc());
1917
1918 DeclRefExpr *E = DeclRefExpr::Create(
1919 Context, NNS, TemplateKWLoc, D, RefersToCapturedVariable, NameInfo, Ty,
1920 VK, FoundD, TemplateArgs, getNonOdrUseReasonInCurrentContext(D));
1921 MarkDeclRefReferenced(E);
1922
1923 // C++ [except.spec]p17:
1924 // An exception-specification is considered to be needed when:
1925 // - in an expression, the function is the unique lookup result or
1926 // the selected member of a set of overloaded functions.
1927 //
1928 // We delay doing this until after we've built the function reference and
1929 // marked it as used so that:
1930 // a) if the function is defaulted, we get errors from defining it before /
1931 // instead of errors from computing its exception specification, and
1932 // b) if the function is a defaulted comparison, we can use the body we
1933 // build when defining it as input to the exception specification
1934 // computation rather than computing a new body.
1935 if (auto *FPT = Ty->getAs<FunctionProtoType>()) {
1936 if (isUnresolvedExceptionSpec(FPT->getExceptionSpecType())) {
1937 if (auto *NewFPT = ResolveExceptionSpec(NameInfo.getLoc(), FPT))
1938 E->setType(Context.getQualifiedType(NewFPT, Ty.getQualifiers()));
1939 }
1940 }
1941
1942 if (getLangOpts().ObjCWeak && isa<VarDecl>(D) &&
1943 Ty.getObjCLifetime() == Qualifiers::OCL_Weak && !isUnevaluatedContext() &&
1944 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, E->getBeginLoc()))
1945 getCurFunction()->recordUseOfWeak(E);
1946
1947 FieldDecl *FD = dyn_cast<FieldDecl>(D);
1948 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(D))
1949 FD = IFD->getAnonField();
1950 if (FD) {
1951 UnusedPrivateFields.remove(FD);
1952 // Just in case we're building an illegal pointer-to-member.
1953 if (FD->isBitField())
1954 E->setObjectKind(OK_BitField);
1955 }
1956
1957 // C++ [expr.prim]/8: The expression [...] is a bit-field if the identifier
1958 // designates a bit-field.
1959 if (auto *BD = dyn_cast<BindingDecl>(D))
1960 if (auto *BE = BD->getBinding())
1961 E->setObjectKind(BE->getObjectKind());
1962
1963 return E;
1964 }
1965
1966 /// Decomposes the given name into a DeclarationNameInfo, its location, and
1967 /// possibly a list of template arguments.
1968 ///
1969 /// If this produces template arguments, it is permitted to call
1970 /// DecomposeTemplateName.
1971 ///
1972 /// This actually loses a lot of source location information for
1973 /// non-standard name kinds; we should consider preserving that in
1974 /// some way.
1975 void
1976 Sema::DecomposeUnqualifiedId(const UnqualifiedId &Id,
1977 TemplateArgumentListInfo &Buffer,
1978 DeclarationNameInfo &NameInfo,
1979 const TemplateArgumentListInfo *&TemplateArgs) {
1980 if (Id.getKind() == UnqualifiedIdKind::IK_TemplateId) {
1981 Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
1982 Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);
1983
1984 ASTTemplateArgsPtr TemplateArgsPtr(Id.TemplateId->getTemplateArgs(),
1985 Id.TemplateId->NumArgs);
1986 translateTemplateArguments(TemplateArgsPtr, Buffer);
1987
1988 TemplateName TName = Id.TemplateId->Template.get();
1989 SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
1990 NameInfo = Context.getNameForTemplate(TName, TNameLoc);
1991 TemplateArgs = &Buffer;
1992 } else {
1993 NameInfo = GetNameFromUnqualifiedId(Id);
1994 TemplateArgs = nullptr;
1995 }
1996 }
1997
1998 static void emitEmptyLookupTypoDiagnostic(
1999 const TypoCorrection &TC, Sema &SemaRef, const CXXScopeSpec &SS,
2000 DeclarationName Typo, SourceLocation TypoLoc, ArrayRef<Expr *> Args,
2001 unsigned DiagnosticID, unsigned DiagnosticSuggestID) {
2002 DeclContext *Ctx =
2003 SS.isEmpty() ? nullptr : SemaRef.computeDeclContext(SS, false);
2004 if (!TC) {
2005 // Emit a special diagnostic for failed member lookups.
2006 // FIXME: computing the declaration context might fail here (?)
2007 if (Ctx)
2008 SemaRef.Diag(TypoLoc, diag::err_no_member) << Typo << Ctx
2009 << SS.getRange();
2010 else
2011 SemaRef.Diag(TypoLoc, DiagnosticID) << Typo;
2012 return;
2013 }
2014
2015 std::string CorrectedStr = TC.getAsString(SemaRef.getLangOpts());
2016 bool DroppedSpecifier =
2017 TC.WillReplaceSpecifier() && Typo.getAsString() == CorrectedStr;
2018 unsigned NoteID = TC.getCorrectionDeclAs<ImplicitParamDecl>()
2019 ? diag::note_implicit_param_decl
2020 : diag::note_previous_decl;
2021 if (!Ctx)
2022 SemaRef.diagnoseTypo(TC, SemaRef.PDiag(DiagnosticSuggestID) << Typo,
2023 SemaRef.PDiag(NoteID));
2024 else
2025 SemaRef.diagnoseTypo(TC, SemaRef.PDiag(diag::err_no_member_suggest)
2026 << Typo << Ctx << DroppedSpecifier
2027 << SS.getRange(),
2028 SemaRef.PDiag(NoteID));
2029 }
2030
2031 /// Diagnose an empty lookup.
2032 ///
2033 /// \return false if new lookup candidates were found
2034 bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
2035 CorrectionCandidateCallback &CCC,
2036 TemplateArgumentListInfo *ExplicitTemplateArgs,
2037 ArrayRef<Expr *> Args, TypoExpr **Out) {
2038 DeclarationName Name = R.getLookupName();
2039
2040 unsigned diagnostic = diag::err_undeclared_var_use;
2041 unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
2042 if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
2043 Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
2044 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
2045 diagnostic = diag::err_undeclared_use;
2046 diagnostic_suggest = diag::err_undeclared_use_suggest;
2047 }
2048
2049 // If the original lookup was an unqualified lookup, fake an
2050 // unqualified lookup. This is useful when (for example) the
2051 // original lookup would not have found something because it was a
2052 // dependent name.
2053 DeclContext *DC = SS.isEmpty() ? CurContext : nullptr;
2054 while (DC) {
2055 if (isa<CXXRecordDecl>(DC)) {
2056 LookupQualifiedName(R, DC);
2057
2058 if (!R.empty()) {
2059 // Don't give errors about ambiguities in this lookup.
2060 R.suppressDiagnostics();
2061
2062 // During a default argument instantiation the CurContext points
2063 // to a CXXMethodDecl; but we can't apply a this-> fixit inside a
2064 // function parameter list, hence add an explicit check.
2065 bool isDefaultArgument =
2066 !CodeSynthesisContexts.empty() &&
2067 CodeSynthesisContexts.back().Kind ==
2068 CodeSynthesisContext::DefaultFunctionArgumentInstantiation;
2069 CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
2070 bool isInstance = CurMethod &&
2071 CurMethod->isInstance() &&
2072 DC == CurMethod->getParent() && !isDefaultArgument;
2073
2074 // Give a code modification hint to insert 'this->'.
2075 // TODO: fixit for inserting 'Base<T>::' in the other cases.
2076 // Actually quite difficult!
2077 if (getLangOpts().MSVCCompat)
2078 diagnostic = diag::ext_found_via_dependent_bases_lookup;
2079 if (isInstance) {
2080 Diag(R.getNameLoc(), diagnostic) << Name
2081 << FixItHint::CreateInsertion(R.getNameLoc(), "this->");
2082 CheckCXXThisCapture(R.getNameLoc());
2083 } else {
2084 Diag(R.getNameLoc(), diagnostic) << Name;
2085 }
2086
2087 // Do we really want to note all of these?
2088 for (NamedDecl *D : R)
2089 Diag(D->getLocation(), diag::note_dependent_var_use);
2090
2091 // Return true if we are inside a default argument instantiation
2092 // and the found name refers to an instance member function, otherwise
2093 // the function calling DiagnoseEmptyLookup will try to create an
2094 // implicit member call and this is wrong for default argument.
2095 if (isDefaultArgument && ((*R.begin())->isCXXInstanceMember())) {
2096 Diag(R.getNameLoc(), diag::err_member_call_without_object);
2097 return true;
2098 }
2099
2100 // Tell the callee to try to recover.
2101 return false;
2102 }
2103
2104 R.clear();
2105 }
2106
2107 DC = DC->getLookupParent();
2108 }
2109
2110 // We didn't find anything, so try to correct for a typo.
2111 TypoCorrection Corrected;
2112 if (S && Out) {
2113 SourceLocation TypoLoc = R.getNameLoc();
2114 assert(!ExplicitTemplateArgs &&
2115 "Diagnosing an empty lookup with explicit template args!");
2116 *Out = CorrectTypoDelayed(
2117 R.getLookupNameInfo(), R.getLookupKind(), S, &SS, CCC,
2118 [=](const TypoCorrection &TC) {
2119 emitEmptyLookupTypoDiagnostic(TC, *this, SS, Name, TypoLoc, Args,
2120 diagnostic, diagnostic_suggest);
2121 },
2122 nullptr, CTK_ErrorRecovery);
2123 if (*Out)
2124 return true;
2125 } else if (S &&
2126 (Corrected = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(),
2127 S, &SS, CCC, CTK_ErrorRecovery))) {
2128 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
2129 bool DroppedSpecifier =
2130 Corrected.WillReplaceSpecifier() && Name.getAsString() == CorrectedStr;
2131 R.setLookupName(Corrected.getCorrection());
2132
2133 bool AcceptableWithRecovery = false;
2134 bool AcceptableWithoutRecovery = false;
2135 NamedDecl *ND = Corrected.getFoundDecl();
2136 if (ND) {
2137 if (Corrected.isOverloaded()) {
2138 OverloadCandidateSet OCS(R.getNameLoc(),
2139 OverloadCandidateSet::CSK_Normal);
2140 OverloadCandidateSet::iterator Best;
2141 for (NamedDecl *CD : Corrected) {
2142 if (FunctionTemplateDecl *FTD =
2143 dyn_cast<FunctionTemplateDecl>(CD))
2144 AddTemplateOverloadCandidate(
2145 FTD, DeclAccessPair::make(FTD, AS_none), ExplicitTemplateArgs,
2146 Args, OCS);
2147 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(CD))
2148 if (!ExplicitTemplateArgs || ExplicitTemplateArgs->size() == 0)
2149 AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none),
2150 Args, OCS);
2151 }
2152 switch (OCS.BestViableFunction(*this, R.getNameLoc(), Best)) {
2153 case OR_Success:
2154 ND = Best->FoundDecl;
2155 Corrected.setCorrectionDecl(ND);
2156 break;
2157 default:
2158 // FIXME: Arbitrarily pick the first declaration for the note.
2159 Corrected.setCorrectionDecl(ND);
2160 break;
2161 }
2162 }
2163 R.addDecl(ND);
2164 if (getLangOpts().CPlusPlus && ND->isCXXClassMember()) {
2165 CXXRecordDecl *Record = nullptr;
2166 if (Corrected.getCorrectionSpecifier()) {
2167 const Type *Ty = Corrected.getCorrectionSpecifier()->getAsType();
2168 Record = Ty->getAsCXXRecordDecl();
2169 }
2170 if (!Record)
2171 Record = cast<CXXRecordDecl>(
2172 ND->getDeclContext()->getRedeclContext());
2173 R.setNamingClass(Record);
2174 }
2175
2176 auto *UnderlyingND = ND->getUnderlyingDecl();
2177 AcceptableWithRecovery = isa<ValueDecl>(UnderlyingND) ||
2178 isa<FunctionTemplateDecl>(UnderlyingND);
2179 // FIXME: If we ended up with a typo for a type name or
2180 // Objective-C class name, we're in trouble because the parser
2181 // is in the wrong place to recover. Suggest the typo
2182 // correction, but don't make it a fix-it since we're not going
2183 // to recover well anyway.
2184 AcceptableWithoutRecovery = isa<TypeDecl>(UnderlyingND) ||
2185 getAsTypeTemplateDecl(UnderlyingND) ||
2186 isa<ObjCInterfaceDecl>(UnderlyingND);
2187 } else {
2188 // FIXME: We found a keyword. Suggest it, but don't provide a fix-it
2189 // because we aren't able to recover.
2190 AcceptableWithoutRecovery = true;
2191 }
2192
2193 if (AcceptableWithRecovery || AcceptableWithoutRecovery) {
2194 unsigned NoteID = Corrected.getCorrectionDeclAs<ImplicitParamDecl>()
2195 ? diag::note_implicit_param_decl
2196 : diag::note_previous_decl;
2197 if (SS.isEmpty())
2198 diagnoseTypo(Corrected, PDiag(diagnostic_suggest) << Name,
2199 PDiag(NoteID), AcceptableWithRecovery);
2200 else
2201 diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest)
2202 << Name << computeDeclContext(SS, false)
2203 << DroppedSpecifier << SS.getRange(),
2204 PDiag(NoteID), AcceptableWithRecovery);
2205
2206 // Tell the callee whether to try to recover.
2207 return !AcceptableWithRecovery;
2208 }
2209 }
2210 R.clear();
2211
2212 // Emit a special diagnostic for failed member lookups.
2213 // FIXME: computing the declaration context might fail here (?)
2214 if (!SS.isEmpty()) {
2215 Diag(R.getNameLoc(), diag::err_no_member)
2216 << Name << computeDeclContext(SS, false)
2217 << SS.getRange();
2218 return true;
2219 }
2220
2221 // Give up, we can't recover.
2222 Diag(R.getNameLoc(), diagnostic) << Name;
2223 return true;
2224 }
2225
2226 /// In Microsoft mode, if we are inside a template class whose parent class has
2227 /// dependent base classes, and we can't resolve an unqualified identifier, then
2228 /// assume the identifier is a member of a dependent base class. We can only
2229 /// recover successfully in static methods, instance methods, and other contexts
2230 /// where 'this' is available. This doesn't precisely match MSVC's
2231 /// instantiation model, but it's close enough.
2232 static Expr *
2233 recoverFromMSUnqualifiedLookup(Sema &S, ASTContext &Context,
2234 DeclarationNameInfo &NameInfo,
2235 SourceLocation TemplateKWLoc,
2236 const TemplateArgumentListInfo *TemplateArgs) {
2237 // Only try to recover from lookup into dependent bases in static methods or
2238 // contexts where 'this' is available.
2239 QualType ThisType = S.getCurrentThisType();
2240 const CXXRecordDecl *RD = nullptr;
2241 if (!ThisType.isNull())
2242 RD = ThisType->getPointeeType()->getAsCXXRecordDecl();
2243 else if (auto *MD = dyn_cast<CXXMethodDecl>(S.CurContext))
2244 RD = MD->getParent();
2245 if (!RD || !RD->hasAnyDependentBases())
2246 return nullptr;
2247
2248 // Diagnose this as unqualified lookup into a dependent base class. If 'this'
2249 // is available, suggest inserting 'this->' as a fixit.
2250 SourceLocation Loc = NameInfo.getLoc();
2251 auto DB = S.Diag(Loc, diag::ext_undeclared_unqual_id_with_dependent_base);
2252 DB << NameInfo.getName() << RD;
2253
2254 if (!ThisType.isNull()) {
2255 DB << FixItHint::CreateInsertion(Loc, "this->");
2256 return CXXDependentScopeMemberExpr::Create(
2257 Context, /*This=*/nullptr, ThisType, /*IsArrow=*/true,
2258 /*Op=*/SourceLocation(), NestedNameSpecifierLoc(), TemplateKWLoc,
2259 /*FirstQualifierFoundInScope=*/nullptr, NameInfo, TemplateArgs);
2260 }
2261
2262 // Synthesize a fake NNS that points to the derived class. This will
2263 // perform name lookup during template instantiation.
2264 CXXScopeSpec SS;
2265 auto *NNS =
2266 NestedNameSpecifier::Create(Context, nullptr, true, RD->getTypeForDecl());
2267 SS.MakeTrivial(Context, NNS, SourceRange(Loc, Loc));
2268 return DependentScopeDeclRefExpr::Create(
2269 Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
2270 TemplateArgs);
2271 }
2272
2273 ExprResult
2274 Sema::ActOnIdExpression(Scope *S, CXXScopeSpec &SS,
2275 SourceLocation TemplateKWLoc, UnqualifiedId &Id,
2276 bool HasTrailingLParen, bool IsAddressOfOperand,
2277 CorrectionCandidateCallback *CCC,
2278 bool IsInlineAsmIdentifier, Token *KeywordReplacement) {
2279 assert(!(IsAddressOfOperand && HasTrailingLParen) &&
2280 "cannot be direct & operand and have a trailing lparen");
2281 if (SS.isInvalid())
2282 return ExprError();
2283
2284 TemplateArgumentListInfo TemplateArgsBuffer;
2285
2286 // Decompose the UnqualifiedId into the following data.
2287 DeclarationNameInfo NameInfo;
2288 const TemplateArgumentListInfo *TemplateArgs;
2289 DecomposeUnqualifiedId(Id, TemplateArgsBuffer, NameInfo, TemplateArgs);
2290
2291 DeclarationName Name = NameInfo.getName();
2292 IdentifierInfo *II = Name.getAsIdentifierInfo();
2293 SourceLocation NameLoc = NameInfo.getLoc();
2294
2295 if (II && II->isEditorPlaceholder()) {
2296 // FIXME: When typed placeholders are supported we can create a typed
2297 // placeholder expression node.
2298 return ExprError();
2299 }
2300
2301 // C++ [temp.dep.expr]p3:
2302 // An id-expression is type-dependent if it contains:
2303 // -- an identifier that was declared with a dependent type,
2304 // (note: handled after lookup)
2305 // -- a template-id that is dependent,
2306 // (note: handled in BuildTemplateIdExpr)
2307 // -- a conversion-function-id that specifies a dependent type,
2308 // -- a nested-name-specifier that contains a class-name that
2309 // names a dependent type.
2310 // Determine whether this is a member of an unknown specialization;
2311 // we need to handle these differently.
2312 bool DependentID = false;
2313 if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
2314 Name.getCXXNameType()->isDependentType()) {
2315 DependentID = true;
2316 } else if (SS.isSet()) {
2317 if (DeclContext *DC = computeDeclContext(SS, false)) {
2318 if (RequireCompleteDeclContext(SS, DC))
2319 return ExprError();
2320 } else {
2321 DependentID = true;
2322 }
2323 }
2324
2325 if (DependentID)
2326 return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
2327 IsAddressOfOperand, TemplateArgs);
2328
2329 // Perform the required lookup.
2330 LookupResult R(*this, NameInfo,
2331 (Id.getKind() == UnqualifiedIdKind::IK_ImplicitSelfParam)
2332 ? LookupObjCImplicitSelfParam
2333 : LookupOrdinaryName);
2334 if (TemplateKWLoc.isValid() || TemplateArgs) {
2335 // Lookup the template name again to correctly establish the context in
2336 // which it was found. This is really unfortunate as we already did the
2337 // lookup to determine that it was a template name in the first place. If
2338 // this becomes a performance hit, we can work harder to preserve those
2339 // results until we get here but it's likely not worth it.
2340 bool MemberOfUnknownSpecialization;
2341 AssumedTemplateKind AssumedTemplate;
2342 if (LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
2343 MemberOfUnknownSpecialization, TemplateKWLoc,
2344 &AssumedTemplate))
2345 return ExprError();
2346
2347 if (MemberOfUnknownSpecialization ||
2348 (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation))
2349 return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
2350 IsAddressOfOperand, TemplateArgs);
2351 } else {
2352 bool IvarLookupFollowUp = II && !SS.isSet() && getCurMethodDecl();
2353 LookupParsedName(R, S, &SS, !IvarLookupFollowUp);
2354
2355 // If the result might be in a dependent base class, this is a dependent
2356 // id-expression.
2357 if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
2358 return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo,
2359 IsAddressOfOperand, TemplateArgs);
2360
2361 // If this reference is in an Objective-C method, then we need to do
2362 // some special Objective-C lookup, too.
2363 if (IvarLookupFollowUp) {
2364 ExprResult E(LookupInObjCMethod(R, S, II, true));
2365 if (E.isInvalid())
2366 return ExprError();
2367
2368 if (Expr *Ex = E.getAs<Expr>())
2369 return Ex;
2370 }
2371 }
2372
2373 if (R.isAmbiguous())
2374 return ExprError();
2375
2376 // This could be an implicitly declared function reference (legal in C90,
2377 // extension in C99, forbidden in C++).
2378 if (R.empty() && HasTrailingLParen && II && !getLangOpts().CPlusPlus) {
2379 NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
2380 if (D) R.addDecl(D);
2381 }
2382
2383 // Determine whether this name might be a candidate for
2384 // argument-dependent lookup.
2385 bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);
2386
2387 if (R.empty() && !ADL) {
2388 if (SS.isEmpty() && getLangOpts().MSVCCompat) {
2389 if (Expr *E = recoverFromMSUnqualifiedLookup(*this, Context, NameInfo,
2390 TemplateKWLoc, TemplateArgs))
2391 return E;
2392 }
2393
2394 // Don't diagnose an empty lookup for inline assembly.
2395 if (IsInlineAsmIdentifier)
2396 return ExprError();
2397
2398 // If this name wasn't predeclared and if this is not a function
2399 // call, diagnose the problem.
2400 TypoExpr *TE = nullptr;
2401 DefaultFilterCCC DefaultValidator(II, SS.isValid() ? SS.getScopeRep()
2402 : nullptr);
2403 DefaultValidator.IsAddressOfOperand = IsAddressOfOperand;
2404 assert((!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) &&
2405 "Typo correction callback misconfigured");
2406 if (CCC) {
2407 // Make sure the callback knows what the typo being diagnosed is.
2408 CCC->setTypoName(II);
2409 if (SS.isValid())
2410 CCC->setTypoNNS(SS.getScopeRep());
2411 }
2412 // FIXME: DiagnoseEmptyLookup produces bad diagnostics if we're looking for
2413 // a template name, but we happen to have always already looked up the name
2414 // before we get here if it must be a template name.
2415 if (DiagnoseEmptyLookup(S, SS, R, CCC ? *CCC : DefaultValidator, nullptr,
2416 None, &TE)) {
2417 if (TE && KeywordReplacement) {
2418 auto &State = getTypoExprState(TE);
2419 auto BestTC = State.Consumer->getNextCorrection();
2420 if (BestTC.isKeyword()) {
2421 auto *II = BestTC.getCorrectionAsIdentifierInfo();
2422 if (State.DiagHandler)
2423 State.DiagHandler(BestTC);
2424 KeywordReplacement->startToken();
2425 KeywordReplacement->setKind(II->getTokenID());
2426 KeywordReplacement->setIdentifierInfo(II);
2427 KeywordReplacement->setLocation(BestTC.getCorrectionRange().getBegin());
2428 // Clean up the state associated with the TypoExpr, since it has
2429 // now been diagnosed (without a call to CorrectDelayedTyposInExpr).
2430 clearDelayedTypo(TE);
2431 // Signal that a correction to a keyword was performed by returning a
2432 // valid-but-null ExprResult.
2433 return (Expr*)nullptr;
2434 }
2435 State.Consumer->resetCorrectionStream();
2436 }
2437 return TE ? TE : ExprError();
2438 }
2439
2440 assert(!R.empty() &&
2441 "DiagnoseEmptyLookup returned false but added no results");
2442
2443 // If we found an Objective-C instance variable, let
2444 // LookupInObjCMethod build the appropriate expression to
2445 // reference the ivar.
2446 if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
2447 R.clear();
2448 ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
2449 // In a hopelessly buggy code, Objective-C instance variable
2450 // lookup fails and no expression will be built to reference it.
2451 if (!E.isInvalid() && !E.get())
2452 return ExprError();
2453 return E;
2454 }
2455 }
2456
2457 // This is guaranteed from this point on.
2458 assert(!R.empty() || ADL);
2459
2460 // Check whether this might be a C++ implicit instance member access.
2461 // C++ [class.mfct.non-static]p3:
2462 // When an id-expression that is not part of a class member access
2463 // syntax and not used to form a pointer to member is used in the
2464 // body of a non-static member function of class X, if name lookup
2465 // resolves the name in the id-expression to a non-static non-type
2466 // member of some class C, the id-expression is transformed into a
2467 // class member access expression using (*this) as the
2468 // postfix-expression to the left of the . operator.
2469 //
2470 // But we don't actually need to do this for '&' operands if R
2471 // resolved to a function or overloaded function set, because the
2472 // expression is ill-formed if it actually works out to be a
2473 // non-static member function:
2474 //
2475 // C++ [expr.ref]p4:
2476 // Otherwise, if E1.E2 refers to a non-static member function. . .
2477 // [t]he expression can be used only as the left-hand operand of a
2478 // member function call.
2479 //
2480 // There are other safeguards against such uses, but it's important
2481 // to get this right here so that we don't end up making a
2482 // spuriously dependent expression if we're inside a dependent
2483 // instance method.
2484 if (!R.empty() && (*R.begin())->isCXXClassMember()) {
2485 bool MightBeImplicitMember;
2486 if (!IsAddressOfOperand)
2487 MightBeImplicitMember = true;
2488 else if (!SS.isEmpty())
2489 MightBeImplicitMember = false;
2490 else if (R.isOverloadedResult())
2491 MightBeImplicitMember = false;
2492 else if (R.isUnresolvableResult())
2493 MightBeImplicitMember = true;
2494 else
2495 MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
2496 isa<IndirectFieldDecl>(R.getFoundDecl()) ||
2497 isa<MSPropertyDecl>(R.getFoundDecl());
2498
2499 if (MightBeImplicitMember)
2500 return BuildPossibleImplicitMemberExpr(SS, TemplateKWLoc,
2501 R, TemplateArgs, S);
2502 }
2503
2504 if (TemplateArgs || TemplateKWLoc.isValid()) {
2505
2506 // In C++1y, if this is a variable template id, then check it
2507 // in BuildTemplateIdExpr().
2508 // The single lookup result must be a variable template declaration.
2509 if (Id.getKind() == UnqualifiedIdKind::IK_TemplateId && Id.TemplateId &&
2510 Id.TemplateId->Kind == TNK_Var_template) {
2511 assert(R.getAsSingle<VarTemplateDecl>() &&
2512 "There should only be one declaration found.");
2513 }
2514
2515 return BuildTemplateIdExpr(SS, TemplateKWLoc, R, ADL, TemplateArgs);
2516 }
2517
2518 return BuildDeclarationNameExpr(SS, R, ADL);
2519 }
2520
2521 /// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
2522 /// declaration name, generally during template instantiation.
2523 /// There's a large number of things which don't need to be done along
2524 /// this path.
2525 ExprResult Sema::BuildQualifiedDeclarationNameExpr(
2526 CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo,
2527 bool IsAddressOfOperand, const Scope *S, TypeSourceInfo **RecoveryTSI) {
2528 DeclContext *DC = computeDeclContext(SS, false);
2529 if (!DC)
2530 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
2531 NameInfo, /*TemplateArgs=*/nullptr);
2532
2533 if (RequireCompleteDeclContext(SS, DC))
2534 return ExprError();
2535
2536 LookupResult R(*this, NameInfo, LookupOrdinaryName);
2537 LookupQualifiedName(R, DC);
2538
2539 if (R.isAmbiguous())
2540 return ExprError();
2541
2542 if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)
2543 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(),
2544 NameInfo, /*TemplateArgs=*/nullptr);
2545
2546 if (R.empty()) {
2547 Diag(NameInfo.getLoc(), diag::err_no_member)
2548 << NameInfo.getName() << DC << SS.getRange();
2549 return ExprError();
2550 }
2551
2552 if (const TypeDecl *TD = R.getAsSingle<TypeDecl>()) {
2553 // Diagnose a missing typename if this resolved unambiguously to a type in
2554 // a dependent context. If we can recover with a type, downgrade this to
2555 // a warning in Microsoft compatibility mode.
2556 unsigned DiagID = diag::err_typename_missing;
2557 if (RecoveryTSI && getLangOpts().MSVCCompat)
2558 DiagID = diag::ext_typename_missing;
2559 SourceLocation Loc = SS.getBeginLoc();
2560 auto D = Diag(Loc, DiagID);
2561 D << SS.getScopeRep() << NameInfo.getName().getAsString()
2562 << SourceRange(Loc, NameInfo.getEndLoc());
2563
2564 // Don't recover if the caller isn't expecting us to or if we're in a SFINAE
2565 // context.
2566 if (!RecoveryTSI)
2567 return ExprError();
2568
2569 // Only issue the fixit if we're prepared to recover.
2570 D << FixItHint::CreateInsertion(Loc, "typename ");
2571
2572 // Recover by pretending this was an elaborated type.
2573 QualType Ty = Context.getTypeDeclType(TD);
2574 TypeLocBuilder TLB;
2575 TLB.pushTypeSpec(Ty).setNameLoc(NameInfo.getLoc());
2576
2577 QualType ET = getElaboratedType(ETK_None, SS, Ty);
2578 ElaboratedTypeLoc QTL = TLB.push<ElaboratedTypeLoc>(ET);
2579 QTL.setElaboratedKeywordLoc(SourceLocation());
2580 QTL.setQualifierLoc(SS.getWithLocInContext(Context));
2581
2582 *RecoveryTSI = TLB.getTypeSourceInfo(Context, ET);
2583
2584 return ExprEmpty();
2585 }
2586
2587 // Defend against this resolving to an implicit member access. We usually
2588 // won't get here if this might be a legitimate a class member (we end up in
2589 // BuildMemberReferenceExpr instead), but this can be valid if we're forming
2590 // a pointer-to-member or in an unevaluated context in C++11.
2591 if (!R.empty() && (*R.begin())->isCXXClassMember() && !IsAddressOfOperand)
2592 return BuildPossibleImplicitMemberExpr(SS,
2593 /*TemplateKWLoc=*/SourceLocation(),
2594 R, /*TemplateArgs=*/nullptr, S);
2595
2596 return BuildDeclarationNameExpr(SS, R, /* ADL */ false);
2597 }
2598
2599 /// The parser has read a name in, and Sema has detected that we're currently
2600 /// inside an ObjC method. Perform some additional checks and determine if we
2601 /// should form a reference to an ivar.
2602 ///
2603 /// Ideally, most of this would be done by lookup, but there's
2604 /// actually quite a lot of extra work involved.
2605 DeclResult Sema::LookupIvarInObjCMethod(LookupResult &Lookup, Scope *S,
2606 IdentifierInfo *II) {
2607 SourceLocation Loc = Lookup.getNameLoc();
2608 ObjCMethodDecl *CurMethod = getCurMethodDecl();
2609
2610 // Check for error condition which is already reported.
2611 if (!CurMethod)
2612 return DeclResult(true);
2613
2614 // There are two cases to handle here. 1) scoped lookup could have failed,
2615 // in which case we should look for an ivar. 2) scoped lookup could have
2616 // found a decl, but that decl is outside the current instance method (i.e.
2617 // a global variable). In these two cases, we do a lookup for an ivar with
2618 // this name, if the lookup sucedes, we replace it our current decl.
2619
2620 // If we're in a class method, we don't normally want to look for
2621 // ivars. But if we don't find anything else, and there's an
2622 // ivar, that's an error.
2623 bool IsClassMethod = CurMethod->isClassMethod();
2624
2625 bool LookForIvars;
2626 if (Lookup.empty())
2627 LookForIvars = true;
2628 else if (IsClassMethod)
2629 LookForIvars = false;
2630 else
2631 LookForIvars = (Lookup.isSingleResult() &&
2632 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
2633 ObjCInterfaceDecl *IFace = nullptr;
2634 if (LookForIvars) {
2635 IFace = CurMethod->getClassInterface();
2636 ObjCInterfaceDecl *ClassDeclared;
2637 ObjCIvarDecl *IV = nullptr;
2638 if (IFace && (IV = IFace->lookupInstanceVariable(II, ClassDeclared))) {
2639 // Diagnose using an ivar in a class method.
2640 if (IsClassMethod) {
2641 Diag(Loc, diag::err_ivar_use_in_class_method) << IV->getDeclName();
2642 return DeclResult(true);
2643 }
2644
2645 // Diagnose the use of an ivar outside of the declaring class.
2646 if (IV->getAccessControl() == ObjCIvarDecl::Private &&
2647 !declaresSameEntity(ClassDeclared, IFace) &&
2648 !getLangOpts().DebuggerSupport)
2649 Diag(Loc, diag::err_private_ivar_access) << IV->getDeclName();
2650
2651 // Success.
2652 return IV;
2653 }
2654 } else if (CurMethod->isInstanceMethod()) {
2655 // We should warn if a local variable hides an ivar.
2656 if (ObjCInterfaceDecl *IFace = CurMethod->getClassInterface()) {
2657 ObjCInterfaceDecl *ClassDeclared;
2658 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
2659 if (IV->getAccessControl() != ObjCIvarDecl::Private ||
2660 declaresSameEntity(IFace, ClassDeclared))
2661 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
2662 }
2663 }
2664 } else if (Lookup.isSingleResult() &&
2665 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod()) {
2666 // If accessing a stand-alone ivar in a class method, this is an error.
2667 if (const ObjCIvarDecl *IV =
2668 dyn_cast<ObjCIvarDecl>(Lookup.getFoundDecl())) {
2669 Diag(Loc, diag::err_ivar_use_in_class_method) << IV->getDeclName();
2670 return DeclResult(true);
2671 }
2672 }
2673
2674 // Didn't encounter an error, didn't find an ivar.
2675 return DeclResult(false);
2676 }
2677
2678 ExprResult Sema::BuildIvarRefExpr(Scope *S, SourceLocation Loc,
2679 ObjCIvarDecl *IV) {
2680 ObjCMethodDecl *CurMethod = getCurMethodDecl();
2681 assert(CurMethod && CurMethod->isInstanceMethod() &&
2682 "should not reference ivar from this context");
2683
2684 ObjCInterfaceDecl *IFace = CurMethod->getClassInterface();
2685 assert(IFace && "should not reference ivar from this context");
2686
2687 // If we're referencing an invalid decl, just return this as a silent
2688 // error node. The error diagnostic was already emitted on the decl.
2689 if (IV->isInvalidDecl())
2690 return ExprError();
2691
2692 // Check if referencing a field with __attribute__((deprecated)).
2693 if (DiagnoseUseOfDecl(IV, Loc))
2694 return ExprError();
2695
2696 // FIXME: This should use a new expr for a direct reference, don't
2697 // turn this into Self->ivar, just return a BareIVarExpr or something.
2698 IdentifierInfo &II = Context.Idents.get("self");
2699 UnqualifiedId SelfName;
2700 SelfName.setIdentifier(&II, SourceLocation());
2701 SelfName.setKind(UnqualifiedIdKind::IK_ImplicitSelfParam);
2702 CXXScopeSpec SelfScopeSpec;
2703 SourceLocation TemplateKWLoc;
2704 ExprResult SelfExpr =
2705 ActOnIdExpression(S, SelfScopeSpec, TemplateKWLoc, SelfName,
2706 /*HasTrailingLParen=*/false,
2707 /*IsAddressOfOperand=*/false);
2708 if (SelfExpr.isInvalid())
2709 return ExprError();
2710
2711 SelfExpr = DefaultLvalueConversion(SelfExpr.get());
2712 if (SelfExpr.isInvalid())
2713 return ExprError();
2714
2715 MarkAnyDeclReferenced(Loc, IV, true);
2716
2717 ObjCMethodFamily MF = CurMethod->getMethodFamily();
2718 if (MF != OMF_init && MF != OMF_dealloc && MF != OMF_finalize &&
2719 !IvarBacksCurrentMethodAccessor(IFace, CurMethod, IV))
2720 Diag(Loc, diag::warn_direct_ivar_access) << IV->getDeclName();
2721
2722 ObjCIvarRefExpr *Result = new (Context)
2723 ObjCIvarRefExpr(IV, IV->getUsageType(SelfExpr.get()->getType()), Loc,
2724 IV->getLocation(), SelfExpr.get(), true, true);
2725
2726 if (IV->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
2727 if (!isUnevaluatedContext() &&
2728 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, Loc))
2729 getCurFunction()->recordUseOfWeak(Result);
2730 }
2731 if (getLangOpts().ObjCAutoRefCount)
2732 if (const BlockDecl *BD = CurContext->getInnermostBlockDecl())
2733 ImplicitlyRetainedSelfLocs.push_back({Loc, BD});
2734
2735 return Result;
2736 }
2737
2738 /// The parser has read a name in, and Sema has detected that we're currently
2739 /// inside an ObjC method. Perform some additional checks and determine if we
2740 /// should form a reference to an ivar. If so, build an expression referencing
2741 /// that ivar.
2742 ExprResult
2743 Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
2744 IdentifierInfo *II, bool AllowBuiltinCreation) {
2745 // FIXME: Integrate this lookup step into LookupParsedName.
2746 DeclResult Ivar = LookupIvarInObjCMethod(Lookup, S, II);
2747 if (Ivar.isInvalid())
2748 return ExprError();
2749 if (Ivar.isUsable())
2750 return BuildIvarRefExpr(S, Lookup.getNameLoc(),
2751 cast<ObjCIvarDecl>(Ivar.get()));
2752
2753 if (Lookup.empty() && II && AllowBuiltinCreation)
2754 LookupBuiltin(Lookup);
2755
2756 // Sentinel value saying that we didn't do anything special.
2757 return ExprResult(false);
2758 }
2759
2760 /// Cast a base object to a member's actual type.
2761 ///
2762 /// Logically this happens in three phases:
2763 ///
2764 /// * First we cast from the base type to the naming class.
2765 /// The naming class is the class into which we were looking
2766 /// when we found the member; it's the qualifier type if a
2767 /// qualifier was provided, and otherwise it's the base type.
2768 ///
2769 /// * Next we cast from the naming class to the declaring class.
2770 /// If the member we found was brought into a class's scope by
2771 /// a using declaration, this is that class; otherwise it's
2772 /// the class declaring the member.
2773 ///
2774 /// * Finally we cast from the declaring class to the "true"
2775 /// declaring class of the member. This conversion does not
2776 /// obey access control.
2777 ExprResult
2778 Sema::PerformObjectMemberConversion(Expr *From,
2779 NestedNameSpecifier *Qualifier,
2780 NamedDecl *FoundDecl,
2781 NamedDecl *Member) {
2782 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
2783 if (!RD)
2784 return From;
2785
2786 QualType DestRecordType;
2787 QualType DestType;
2788 QualType FromRecordType;
2789 QualType FromType = From->getType();
2790 bool PointerConversions = false;
2791 if (isa<FieldDecl>(Member)) {
2792 DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));
2793 auto FromPtrType = FromType->getAs<PointerType>();
2794 DestRecordType = Context.getAddrSpaceQualType(
2795 DestRecordType, FromPtrType
2796 ? FromType->getPointeeType().getAddressSpace()
2797 : FromType.getAddressSpace());
2798
2799 if (FromPtrType) {
2800 DestType = Context.getPointerType(DestRecordType);
2801 FromRecordType = FromPtrType->getPointeeType();
2802 PointerConversions = true;
2803 } else {
2804 DestType = DestRecordType;
2805 FromRecordType = FromType;
2806 }
2807 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) {
2808 if (Method->isStatic())
2809 return From;
2810
2811 DestType = Method->getThisType();
2812 DestRecordType = DestType->getPointeeType();
2813
2814 if (FromType->getAs<PointerType>()) {
2815 FromRecordType = FromType->getPointeeType();
2816 PointerConversions = true;
2817 } else {
2818 FromRecordType = FromType;
2819 DestType = DestRecordType;
2820 }
2821
2822 LangAS FromAS = FromRecordType.getAddressSpace();
2823 LangAS DestAS = DestRecordType.getAddressSpace();
2824 if (FromAS != DestAS) {
2825 QualType FromRecordTypeWithoutAS =
2826 Context.removeAddrSpaceQualType(FromRecordType);
2827 QualType FromTypeWithDestAS =
2828 Context.getAddrSpaceQualType(FromRecordTypeWithoutAS, DestAS);
2829 if (PointerConversions)
2830 FromTypeWithDestAS = Context.getPointerType(FromTypeWithDestAS);
2831 From = ImpCastExprToType(From, FromTypeWithDestAS,
2832 CK_AddressSpaceConversion, From->getValueKind())
2833 .get();
2834 }
2835 } else {
2836 // No conversion necessary.
2837 return From;
2838 }
2839
2840 if (DestType->isDependentType() || FromType->isDependentType())
2841 return From;
2842
2843 // If the unqualified types are the same, no conversion is necessary.
2844 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
2845 return From;
2846
2847 SourceRange FromRange = From->getSourceRange();
2848 SourceLocation FromLoc = FromRange.getBegin();
2849
2850 ExprValueKind VK = From->getValueKind();
2851
2852 // C++ [class.member.lookup]p8:
2853 // [...] Ambiguities can often be resolved by qualifying a name with its
2854 // class name.
2855 //
2856 // If the member was a qualified name and the qualified referred to a
2857 // specific base subobject type, we'll cast to that intermediate type
2858 // first and then to the object in which the member is declared. That allows
2859 // one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
2860 //
2861 // class Base { public: int x; };
2862 // class Derived1 : public Base { };
2863 // class Derived2 : public Base { };
2864 // class VeryDerived : public Derived1, public Derived2 { void f(); };
2865 //
2866 // void VeryDerived::f() {
2867 // x = 17; // error: ambiguous base subobjects
2868 // Derived1::x = 17; // okay, pick the Base subobject of Derived1
2869 // }
2870 if (Qualifier && Qualifier->getAsType()) {
2871 QualType QType = QualType(Qualifier->getAsType(), 0);
2872 assert(QType->isRecordType() && "lookup done with non-record type");
2873
2874 QualType QRecordType = QualType(QType->getAs<RecordType>(), 0);
2875
2876 // In C++98, the qualifier type doesn't actually have to be a base
2877 // type of the object type, in which case we just ignore it.
2878 // Otherwise build the appropriate casts.
2879 if (IsDerivedFrom(FromLoc, FromRecordType, QRecordType)) {
2880 CXXCastPath BasePath;
2881 if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
2882 FromLoc, FromRange, &BasePath))
2883 return ExprError();
2884
2885 if (PointerConversions)
2886 QType = Context.getPointerType(QType);
2887 From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
2888 VK, &BasePath).get();
2889
2890 FromType = QType;
2891 FromRecordType = QRecordType;
2892
2893 // If the qualifier type was the same as the destination type,
2894 // we're done.
2895 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
2896 return From;
2897 }
2898 }
2899
2900 bool IgnoreAccess = false;
2901
2902 // If we actually found the member through a using declaration, cast
2903 // down to the using declaration's type.
2904 //
2905 // Pointer equality is fine here because only one declaration of a
2906 // class ever has member declarations.
2907 if (FoundDecl->getDeclContext() != Member->getDeclContext()) {
2908 assert(isa<UsingShadowDecl>(FoundDecl));
2909 QualType URecordType = Context.getTypeDeclType(
2910 cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
2911
2912 // We only need to do this if the naming-class to declaring-class
2913 // conversion is non-trivial.
2914 if (!Context.hasSameUnqualifiedType(FromRecordType, URecordType)) {
2915 assert(IsDerivedFrom(FromLoc, FromRecordType, URecordType));
2916 CXXCastPath BasePath;
2917 if (CheckDerivedToBaseConversion(FromRecordType, URecordType,
2918 FromLoc, FromRange, &BasePath))
2919 return ExprError();
2920
2921 QualType UType = URecordType;
2922 if (PointerConversions)
2923 UType = Context.getPointerType(UType);
2924 From = ImpCastExprToType(From, UType, CK_UncheckedDerivedToBase,
2925 VK, &BasePath).get();
2926 FromType = UType;
2927 FromRecordType = URecordType;
2928 }
2929
2930 // We don't do access control for the conversion from the
2931 // declaring class to the true declaring class.
2932 IgnoreAccess = true;
2933 }
2934
2935 CXXCastPath BasePath;
2936 if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
2937 FromLoc, FromRange, &BasePath,
2938 IgnoreAccess))
2939 return ExprError();
2940
2941 return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
2942 VK, &BasePath);
2943 }
2944
2945 bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
2946 const LookupResult &R,
2947 bool HasTrailingLParen) {
2948 // Only when used directly as the postfix-expression of a call.
2949 if (!HasTrailingLParen)
2950 return false;
2951
2952 // Never if a scope specifier was provided.
2953 if (SS.isSet())
2954 return false;
2955
2956 // Only in C++ or ObjC++.
2957 if (!getLangOpts().CPlusPlus)
2958 return false;
2959
2960 // Turn off ADL when we find certain kinds of declarations during
2961 // normal lookup:
2962 for (NamedDecl *D : R) {
2963 // C++0x [basic.lookup.argdep]p3:
2964 // -- a declaration of a class member
2965 // Since using decls preserve this property, we check this on the
2966 // original decl.
2967 if (D->isCXXClassMember())
2968 return false;
2969
2970 // C++0x [basic.lookup.argdep]p3:
2971 // -- a block-scope function declaration that is not a
2972 // using-declaration
2973 // NOTE: we also trigger this for function templates (in fact, we
2974 // don't check the decl type at all, since all other decl types
2975 // turn off ADL anyway).
2976 if (isa<UsingShadowDecl>(D))
2977 D = cast<UsingShadowDecl>(D)->getTargetDecl();
2978 else if (D->getLexicalDeclContext()->isFunctionOrMethod())
2979 return false;
2980
2981 // C++0x [basic.lookup.argdep]p3:
2982 // -- a declaration that is neither a function or a function
2983 // template
2984 // And also for builtin functions.
2985 if (isa<FunctionDecl>(D)) {
2986 FunctionDecl *FDecl = cast<FunctionDecl>(D);
2987
2988 // But also builtin functions.
2989 if (FDecl->getBuiltinID() && FDecl->isImplicit())
2990 return false;
2991 } else if (!isa<FunctionTemplateDecl>(D))
2992 return false;
2993 }
2994
2995 return true;
2996 }
2997
2998
2999 /// Diagnoses obvious problems with the use of the given declaration
3000 /// as an expression. This is only actually called for lookups that
3001 /// were not overloaded, and it doesn't promise that the declaration
3002 /// will in fact be used.
3003 static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D) {
3004 if (D->isInvalidDecl())
3005 return true;
3006
3007 if (isa<TypedefNameDecl>(D)) {
3008 S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
3009 return true;
3010 }
3011
3012 if (isa<ObjCInterfaceDecl>(D)) {
3013 S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
3014 return true;
3015 }
3016
3017 if (isa<NamespaceDecl>(D)) {
3018 S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
3019 return true;
3020 }
3021
3022 return false;
3023 }
3024
3025 // Certain multiversion types should be treated as overloaded even when there is
3026 // only one result.
3027 static bool ShouldLookupResultBeMultiVersionOverload(const LookupResult &R) {
3028 assert(R.isSingleResult() && "Expected only a single result");
3029 const auto *FD = dyn_cast<FunctionDecl>(R.getFoundDecl());
3030 return FD &&
3031 (FD->isCPUDispatchMultiVersion() || FD->isCPUSpecificMultiVersion());
3032 }
3033
3034 ExprResult Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
3035 LookupResult &R, bool NeedsADL,
3036 bool AcceptInvalidDecl) {
3037 // If this is a single, fully-resolved result and we don't need ADL,
3038 // just build an ordinary singleton decl ref.
3039 if (!NeedsADL && R.isSingleResult() &&
3040 !R.getAsSingle<FunctionTemplateDecl>() &&
3041 !ShouldLookupResultBeMultiVersionOverload(R))
3042 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), R.getFoundDecl(),
3043 R.getRepresentativeDecl(), nullptr,
3044 AcceptInvalidDecl);
3045
3046 // We only need to check the declaration if there's exactly one
3047 // result, because in the overloaded case the results can only be
3048 // functions and function templates.
3049 if (R.isSingleResult() && !ShouldLookupResultBeMultiVersionOverload(R) &&
3050 CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl()))
3051 return ExprError();
3052
3053 // Otherwise, just build an unresolved lookup expression. Suppress
3054 // any lookup-related diagnostics; we'll hash these out later, when
3055 // we've picked a target.
3056 R.suppressDiagnostics();
3057
3058 UnresolvedLookupExpr *ULE
3059 = UnresolvedLookupExpr::Create(Context, R.getNamingClass(),
3060 SS.getWithLocInContext(Context),
3061 R.getLookupNameInfo(),
3062 NeedsADL, R.isOverloadedResult(),
3063 R.begin(), R.end());
3064
3065 return ULE;
3066 }
3067
3068 static void
3069 diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
3070 ValueDecl *var, DeclContext *DC);
3071
3072 /// Complete semantic analysis for a reference to the given declaration.
3073 ExprResult Sema::BuildDeclarationNameExpr(
3074 const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, NamedDecl *D,
3075 NamedDecl *FoundD, const TemplateArgumentListInfo *TemplateArgs,
3076 bool AcceptInvalidDecl) {
3077 assert(D && "Cannot refer to a NULL declaration");
3078 assert(!isa<FunctionTemplateDecl>(D) &&
3079 "Cannot refer unambiguously to a function template");
3080
3081 SourceLocation Loc = NameInfo.getLoc();
3082 if (CheckDeclInExpr(*this, Loc, D))
3083 return ExprError();
3084
3085 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
3086 // Specifically diagnose references to class templates that are missing
3087 // a template argument list.
3088 diagnoseMissingTemplateArguments(TemplateName(Template), Loc);
3089 return ExprError();
3090 }
3091
3092 // Make sure that we're referring to a value.
3093 ValueDecl *VD = dyn_cast<ValueDecl>(D);
3094 if (!VD) {
3095 Diag(Loc, diag::err_ref_non_value)
3096 << D << SS.getRange();
3097 Diag(D->getLocation(), diag::note_declared_at);
3098 return ExprError();
3099 }
3100
3101 // Check whether this declaration can be used. Note that we suppress
3102 // this check when we're going to perform argument-dependent lookup
3103 // on this function name, because this might not be the function
3104 // that overload resolution actually selects.
3105 if (DiagnoseUseOfDecl(VD, Loc))
3106 return ExprError();
3107
3108 // Only create DeclRefExpr's for valid Decl's.
3109 if (VD->isInvalidDecl() && !AcceptInvalidDecl)
3110 return ExprError();
3111
3112 // Handle members of anonymous structs and unions. If we got here,
3113 // and the reference is to a class member indirect field, then this
3114 // must be the subject of a pointer-to-member expression.
3115 if (IndirectFieldDecl *indirectField = dyn_cast<IndirectFieldDecl>(VD))
3116 if (!indirectField->isCXXClassMember())
3117 return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(),
3118 indirectField);
3119
3120 {
3121 QualType type = VD->getType();
3122 if (type.isNull())
3123 return ExprError();
3124 ExprValueKind valueKind = VK_RValue;
3125
3126 switch (D->getKind()) {
3127 // Ignore all the non-ValueDecl kinds.
3128 #define ABSTRACT_DECL(kind)
3129 #define VALUE(type, base)
3130 #define DECL(type, base) \
3131 case Decl::type:
3132 #include "clang/AST/DeclNodes.inc"
3133 llvm_unreachable("invalid value decl kind");
3134
3135 // These shouldn't make it here.
3136 case Decl::ObjCAtDefsField:
3137 llvm_unreachable("forming non-member reference to ivar?");
3138
3139 // Enum constants are always r-values and never references.
3140 // Unresolved using declarations are dependent.
3141 case Decl::EnumConstant:
3142 case Decl::UnresolvedUsingValue:
3143 case Decl::OMPDeclareReduction:
3144 case Decl::OMPDeclareMapper:
3145 valueKind = VK_RValue;
3146 break;
3147
3148 // Fields and indirect fields that got here must be for
3149 // pointer-to-member expressions; we just call them l-values for
3150 // internal consistency, because this subexpression doesn't really
3151 // exist in the high-level semantics.
3152 case Decl::Field:
3153 case Decl::IndirectField:
3154 case Decl::ObjCIvar:
3155 assert(getLangOpts().CPlusPlus &&
3156 "building reference to field in C?");
3157
3158 // These can't have reference type in well-formed programs, but
3159 // for internal consistency we do this anyway.
3160 type = type.getNonReferenceType();
3161 valueKind = VK_LValue;
3162 break;
3163
3164 // Non-type template parameters are either l-values or r-values
3165 // depending on the type.
3166 case Decl::NonTypeTemplateParm: {
3167 if (const ReferenceType *reftype = type->getAs<ReferenceType>()) {
3168 type = reftype->getPointeeType();
3169 valueKind = VK_LValue; // even if the parameter is an r-value reference
3170 break;
3171 }
3172
3173 // For non-references, we need to strip qualifiers just in case
3174 // the template parameter was declared as 'const int' or whatever.
3175 valueKind = VK_RValue;
3176 type = type.getUnqualifiedType();
3177 break;
3178 }
3179
3180 case Decl::Var:
3181 case Decl::VarTemplateSpecialization:
3182 case Decl::VarTemplatePartialSpecialization:
3183 case Decl::Decomposition:
3184 case Decl::OMPCapturedExpr:
3185 // In C, "extern void blah;" is valid and is an r-value.
3186 if (!getLangOpts().CPlusPlus &&
3187 !type.hasQualifiers() &&
3188 type->isVoidType()) {
3189 valueKind = VK_RValue;
3190 break;
3191 }
3192 LLVM_FALLTHROUGH;
3193
3194 case Decl::ImplicitParam:
3195 case Decl::ParmVar: {
3196 // These are always l-values.
3197 valueKind = VK_LValue;
3198 type = type.getNonReferenceType();
3199
3200 // FIXME: Does the addition of const really only apply in
3201 // potentially-evaluated contexts? Since the variable isn't actually
3202 // captured in an unevaluated context, it seems that the answer is no.
3203 if (!isUnevaluatedContext()) {
3204 QualType CapturedType = getCapturedDeclRefType(cast<VarDecl>(VD), Loc);
3205 if (!CapturedType.isNull())
3206 type = CapturedType;
3207 }
3208
3209 break;
3210 }
3211
3212 case Decl::Binding: {
3213 // These are always lvalues.
3214 valueKind = VK_LValue;
3215 type = type.getNonReferenceType();
3216 // FIXME: Support lambda-capture of BindingDecls, once CWG actually
3217 // decides how that's supposed to work.
3218 auto *BD = cast<BindingDecl>(VD);
3219 if (BD->getDeclContext() != CurContext) {
3220 auto *DD = dyn_cast_or_null<VarDecl>(BD->getDecomposedDecl());
3221 if (DD && DD->hasLocalStorage())
3222 diagnoseUncapturableValueReference(*this, Loc, BD, CurContext);
3223 }
3224 break;
3225 }
3226
3227 case Decl::Function: {
3228 if (unsigned BID = cast<FunctionDecl>(VD)->getBuiltinID()) {
3229 if (!Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
3230 type = Context.BuiltinFnTy;
3231 valueKind = VK_RValue;
3232 break;
3233 }
3234 }
3235
3236 const FunctionType *fty = type->castAs<FunctionType>();
3237
3238 // If we're referring to a function with an __unknown_anytype
3239 // result type, make the entire expression __unknown_anytype.
3240 if (fty->getReturnType() == Context.UnknownAnyTy) {
3241 type = Context.UnknownAnyTy;
3242 valueKind = VK_RValue;
3243 break;
3244 }
3245
3246 // Functions are l-values in C++.
3247 if (getLangOpts().CPlusPlus) {
3248 valueKind = VK_LValue;
3249 break;
3250 }
3251
3252 // C99 DR 316 says that, if a function type comes from a
3253 // function definition (without a prototype), that type is only
3254 // used for checking compatibility. Therefore, when referencing
3255 // the function, we pretend that we don't have the full function
3256 // type.
3257 if (!cast<FunctionDecl>(VD)->hasPrototype() &&
3258 isa<FunctionProtoType>(fty))
3259 type = Context.getFunctionNoProtoType(fty->getReturnType(),
3260 fty->getExtInfo());
3261
3262 // Functions are r-values in C.
3263 valueKind = VK_RValue;
3264 break;
3265 }
3266
3267 case Decl::CXXDeductionGuide:
3268 llvm_unreachable("building reference to deduction guide");
3269
3270 case Decl::MSProperty:
3271 valueKind = VK_LValue;
3272 break;
3273
3274 case Decl::CXXMethod:
3275 // If we're referring to a method with an __unknown_anytype
3276 // result type, make the entire expression __unknown_anytype.
3277 // This should only be possible with a type written directly.
3278 if (const FunctionProtoType *proto
3279 = dyn_cast<FunctionProtoType>(VD->getType()))
3280 if (proto->getReturnType() == Context.UnknownAnyTy) {
3281 type = Context.UnknownAnyTy;
3282 valueKind = VK_RValue;
3283 break;
3284 }
3285
3286 // C++ methods are l-values if static, r-values if non-static.
3287 if (cast<CXXMethodDecl>(VD)->isStatic()) {
3288 valueKind = VK_LValue;
3289 break;
3290 }
3291 LLVM_FALLTHROUGH;
3292
3293 case Decl::CXXConversion:
3294 case Decl::CXXDestructor:
3295 case Decl::CXXConstructor:
3296 valueKind = VK_RValue;
3297 break;
3298 }
3299
3300 return BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS, FoundD,
3301 /*FIXME: TemplateKWLoc*/ SourceLocation(),
3302 TemplateArgs);
3303 }
3304 }
3305
3306 static void ConvertUTF8ToWideString(unsigned CharByteWidth, StringRef Source,
3307 SmallString<32> &Target) {
3308 Target.resize(CharByteWidth * (Source.size() + 1));
3309 char *ResultPtr = &Target[0];
3310 const llvm::UTF8 *ErrorPtr;
3311 bool success =
3312 llvm::ConvertUTF8toWide(CharByteWidth, Source, ResultPtr, ErrorPtr);
3313 (void)success;
3314 assert(success);
3315 Target.resize(ResultPtr - &Target[0]);
3316 }
3317
3318 ExprResult Sema::BuildPredefinedExpr(SourceLocation Loc,
3319 PredefinedExpr::IdentKind IK) {
3320 // Pick the current block, lambda, captured statement or function.
3321 Decl *currentDecl = nullptr;
3322 if (const BlockScopeInfo *BSI = getCurBlock())
3323 currentDecl = BSI->TheDecl;
3324 else if (const LambdaScopeInfo *LSI = getCurLambda())
3325 currentDecl = LSI->CallOperator;
3326 else if (const CapturedRegionScopeInfo *CSI = getCurCapturedRegion())
3327 currentDecl = CSI->TheCapturedDecl;
3328 else
3329 currentDecl = getCurFunctionOrMethodDecl();
3330
3331 if (!currentDecl) {
3332 Diag(Loc, diag::ext_predef_outside_function);
3333 currentDecl = Context.getTranslationUnitDecl();
3334 }
3335
3336 QualType ResTy;
3337 StringLiteral *SL = nullptr;
3338 if (cast<DeclContext>(currentDecl)->isDependentContext())
3339 ResTy = Context.DependentTy;
3340 else {
3341 // Pre-defined identifiers are of type char[x], where x is the length of
3342 // the string.
3343 auto Str = PredefinedExpr::ComputeName(IK, currentDecl);
3344 unsigned Length = Str.length();
3345
3346 llvm::APInt LengthI(32, Length + 1);
3347 if (IK == PredefinedExpr::LFunction || IK == PredefinedExpr::LFuncSig) {
3348 ResTy =
3349 Context.adjustStringLiteralBaseType(Context.WideCharTy.withConst());
3350 SmallString<32> RawChars;
3351 ConvertUTF8ToWideString(Context.getTypeSizeInChars(ResTy).getQuantity(),
3352 Str, RawChars);
3353 ResTy = Context.getConstantArrayType(ResTy, LengthI, nullptr,
3354 ArrayType::Normal,
3355 /*IndexTypeQuals*/ 0);
3356 SL = StringLiteral::Create(Context, RawChars, StringLiteral::Wide,
3357 /*Pascal*/ false, ResTy, Loc);
3358 } else {
3359 ResTy = Context.adjustStringLiteralBaseType(Context.CharTy.withConst());
3360 ResTy = Context.getConstantArrayType(ResTy, LengthI, nullptr,
3361 ArrayType::Normal,
3362 /*IndexTypeQuals*/ 0);
3363 SL = StringLiteral::Create(Context, Str, StringLiteral::Ascii,
3364 /*Pascal*/ false, ResTy, Loc);
3365 }
3366 }
3367
3368 return PredefinedExpr::Create(Context, Loc, ResTy, IK, SL);
3369 }
3370
3371 ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) {
3372 PredefinedExpr::IdentKind IK;
3373
3374 switch (Kind) {
3375 default: llvm_unreachable("Unknown simple primary expr!");
3376 case tok::kw___func__: IK = PredefinedExpr::Func; break; // [C99 6.4.2.2]
3377 case tok::kw___FUNCTION__: IK = PredefinedExpr::Function; break;
3378 case tok::kw___FUNCDNAME__: IK = PredefinedExpr::FuncDName; break; // [MS]
3379 case tok::kw___FUNCSIG__: IK = PredefinedExpr::FuncSig; break; // [MS]
3380 case tok::kw_L__FUNCTION__: IK = PredefinedExpr::LFunction; break; // [MS]
3381 case tok::kw_L__FUNCSIG__: IK = PredefinedExpr::LFuncSig; break; // [MS]
3382 case tok::kw___PRETTY_FUNCTION__: IK = PredefinedExpr::PrettyFunction; break;
3383 }
3384
3385 return BuildPredefinedExpr(Loc, IK);
3386 }
3387
3388 ExprResult Sema::ActOnCharacterConstant(const Token &Tok, Scope *UDLScope) {
3389 SmallString<16> CharBuffer;
3390 bool Invalid = false;
3391 StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
3392 if (Invalid)
3393 return ExprError();
3394
3395 CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
3396 PP, Tok.getKind());
3397 if (Literal.hadError())
3398 return ExprError();
3399
3400 QualType Ty;
3401 if (Literal.isWide())
3402 Ty = Context.WideCharTy; // L'x' -> wchar_t in C and C++.
3403 else if (Literal.isUTF8() && getLangOpts().Char8)
3404 Ty = Context.Char8Ty; // u8'x' -> char8_t when it exists.
3405 else if (Literal.isUTF16())
3406 Ty = Context.Char16Ty; // u'x' -> char16_t in C11 and C++11.
3407 else if (Literal.isUTF32())
3408 Ty = Context.Char32Ty; // U'x' -> char32_t in C11 and C++11.
3409 else if (!getLangOpts().CPlusPlus || Literal.isMultiChar())
3410 Ty = Context.IntTy; // 'x' -> int in C, 'wxyz' -> int in C++.
3411 else
3412 Ty = Context.CharTy; // 'x' -> char in C++
3413
3414 CharacterLiteral::CharacterKind Kind = CharacterLiteral::Ascii;
3415 if (Literal.isWide())
3416 Kind = CharacterLiteral::Wide;
3417 else if (Literal.isUTF16())
3418 Kind = CharacterLiteral::UTF16;
3419 else if (Literal.isUTF32())
3420 Kind = CharacterLiteral::UTF32;
3421 else if (Literal.isUTF8())
3422 Kind = CharacterLiteral::UTF8;
3423
3424 Expr *Lit = new (Context) CharacterLiteral(Literal.getValue(), Kind, Ty,
3425 Tok.getLocation());
3426
3427 if (Literal.getUDSuffix().empty())
3428 return Lit;
3429
3430 // We're building a user-defined literal.
3431 IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
3432 SourceLocation UDSuffixLoc =
3433 getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset());
3434
3435 // Make sure we're allowed user-defined literals here.
3436 if (!UDLScope)
3437 return ExprError(Diag(UDSuffixLoc, diag::err_invalid_character_udl));
3438
3439 // C++11 [lex.ext]p6: The literal L is treated as a call of the form
3440 // operator "" X (ch)
3441 return BuildCookedLiteralOperatorCall(*this, UDLScope, UDSuffix, UDSuffixLoc,
3442 Lit, Tok.getLocation());
3443 }
3444
3445 ExprResult Sema::ActOnIntegerConstant(SourceLocation Loc, uint64_t Val) {
3446 unsigned IntSize = Context.getTargetInfo().getIntWidth();
3447 return IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val),
3448 Context.IntTy, Loc);
3449 }
3450
3451 static Expr *BuildFloatingLiteral(Sema &S, NumericLiteralParser &Literal,
3452 QualType Ty, SourceLocation Loc) {
3453 const llvm::fltSemantics &Format = S.Context.getFloatTypeSemantics(Ty);
3454
3455 using llvm::APFloat;
3456 APFloat Val(Format);
3457
3458 APFloat::opStatus result = Literal.GetFloatValue(Val);
3459
3460 // Overflow is always an error, but underflow is only an error if
3461 // we underflowed to zero (APFloat reports denormals as underflow).
3462 if ((result & APFloat::opOverflow) ||
3463 ((result & APFloat::opUnderflow) && Val.isZero())) {
3464 unsigned diagnostic;
3465 SmallString<20> buffer;
3466 if (result & APFloat::opOverflow) {
3467 diagnostic = diag::warn_float_overflow;
3468 APFloat::getLargest(Format).toString(buffer);
3469 } else {
3470 diagnostic = diag::warn_float_underflow;
3471 APFloat::getSmallest(Format).toString(buffer);
3472 }
3473
3474 S.Diag(Loc, diagnostic)
3475 << Ty
3476 << StringRef(buffer.data(), buffer.size());
3477 }
3478
3479 bool isExact = (result == APFloat::opOK);
3480 return FloatingLiteral::Create(S.Context, Val, isExact, Ty, Loc);
3481 }
3482
3483 bool Sema::CheckLoopHintExpr(Expr *E, SourceLocation Loc) {
3484 assert(E && "Invalid expression");
3485
3486 if (E->isValueDependent())
3487 return false;
3488
3489 QualType QT = E->getType();
3490 if (!QT->isIntegerType() || QT->isBooleanType() || QT->isCharType()) {
3491 Diag(E->getExprLoc(), diag::err_pragma_loop_invalid_argument_type) << QT;
3492 return true;
3493 }
3494
3495 llvm::APSInt ValueAPS;
3496 ExprResult R = VerifyIntegerConstantExpression(E, &ValueAPS);
3497
3498 if (R.isInvalid())
3499 return true;
3500
3501 bool ValueIsPositive = ValueAPS.isStrictlyPositive();
3502 if (!ValueIsPositive || ValueAPS.getActiveBits() > 31) {
3503 Diag(E->getExprLoc(), diag::err_pragma_loop_invalid_argument_value)
3504 << ValueAPS.toString(10) << ValueIsPositive;
3505 return true;
3506 }
3507
3508 return false;
3509 }
3510
3511 ExprResult Sema::ActOnNumericConstant(const Token &Tok, Scope *UDLScope) {
3512 // Fast path for a single digit (which is quite common). A single digit
3513 // cannot have a trigraph, escaped newline, radix prefix, or suffix.
3514 if (Tok.getLength() == 1) {
3515 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
3516 return ActOnIntegerConstant(Tok.getLocation(), Val-'0');
3517 }
3518
3519 SmallString<128> SpellingBuffer;
3520 // NumericLiteralParser wants to overread by one character. Add padding to
3521 // the buffer in case the token is copied to the buffer. If getSpelling()
3522 // returns a StringRef to the memory buffer, it should have a null char at
3523 // the EOF, so it is also safe.
3524 SpellingBuffer.resize(Tok.getLength() + 1);
3525
3526 // Get the spelling of the token, which eliminates trigraphs, etc.
3527 bool Invalid = false;
3528 StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid);
3529 if (Invalid)
3530 return ExprError();
3531
3532 NumericLiteralParser Literal(TokSpelling, Tok.getLocation(), PP);
3533 if (Literal.hadError)
3534 return ExprError();
3535
3536 if (Literal.hasUDSuffix()) {
3537 // We're building a user-defined literal.
3538 IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix());
3539 SourceLocation UDSuffixLoc =
3540 getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset());
3541
3542 // Make sure we're allowed user-defined literals here.
3543 if (!UDLScope)
3544 return ExprError(Diag(UDSuffixLoc, diag::err_invalid_numeric_udl));
3545
3546 QualType CookedTy;
3547 if (Literal.isFloatingLiteral()) {
3548 // C++11 [lex.ext]p4: If S contains a literal operator with parameter type
3549 // long double, the literal is treated as a call of the form
3550 // operator "" X (f L)
3551 CookedTy = Context.LongDoubleTy;
3552 } else {
3553 // C++11 [lex.ext]p3: If S contains a literal operator with parameter type
3554 // unsigned long long, the literal is treated as a call of the form
3555 // operator "" X (n ULL)
3556 CookedTy = Context.UnsignedLongLongTy;
3557 }
3558
3559 DeclarationName OpName =
3560 Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix);
3561 DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc);
3562 OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc);
3563
3564 SourceLocation TokLoc = Tok.getLocation();
3565
3566 // Perform literal operator lookup to determine if we're building a raw
3567 // literal or a cooked one.
3568 LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName);
3569 switch (LookupLiteralOperator(UDLScope, R, CookedTy,
3570 /*AllowRaw*/ true, /*AllowTemplate*/ true,
3571 /*AllowStringTemplate*/ false,
3572 /*DiagnoseMissing*/ !Literal.isImaginary)) {
3573 case LOLR_ErrorNoDiagnostic:
3574 // Lookup failure for imaginary constants isn't fatal, there's still the
3575 // GNU extension producing _Complex types.
3576 break;
3577 case LOLR_Error:
3578 return ExprError();
3579 case LOLR_Cooked: {
3580 Expr *Lit;
3581 if (Literal.isFloatingLiteral()) {
3582 Lit = BuildFloatingLiteral(*this, Literal, CookedTy, Tok.getLocation());
3583 } else {
3584 llvm::APInt ResultVal(Context.getTargetInfo().getLongLongWidth(), 0);
3585 if (Literal.GetIntegerValue(ResultVal))
3586 Diag(Tok.getLocation(), diag::err_integer_literal_too_large)
3587 << /* Unsigned */ 1;
3588 Lit = IntegerLiteral::Create(Context, ResultVal, CookedTy,
3589 Tok.getLocation());
3590 }
3591 return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc);
3592 }
3593
3594 case LOLR_Raw: {
3595 // C++11 [lit.ext]p3, p4: If S contains a raw literal operator, the
3596 // literal is treated as a call of the form
3597 // operator "" X ("n")
3598 unsigned Length = Literal.getUDSuffixOffset();
3599 QualType StrTy = Context.getConstantArrayType(
3600 Context.adjustStringLiteralBaseType(Context.CharTy.withConst()),
3601 llvm::APInt(32, Length + 1), nullptr, ArrayType::Normal, 0);
3602 Expr *Lit = StringLiteral::Create(
3603 Context, StringRef(TokSpelling.data(), Length), StringLiteral::Ascii,
3604 /*Pascal*/false, StrTy, &TokLoc, 1);
3605 return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc);
3606 }
3607
3608 case LOLR_Template: {
3609 // C++11 [lit.ext]p3, p4: Otherwise (S contains a literal operator
3610 // template), L is treated as a call fo the form
3611 // operator "" X <'c1', 'c2', ... 'ck'>()
3612 // where n is the source character sequence c1 c2 ... ck.
3613 TemplateArgumentListInfo ExplicitArgs;
3614 unsigned CharBits = Context.getIntWidth(Context.CharTy);
3615 bool CharIsUnsigned = Context.CharTy->isUnsignedIntegerType();
3616 llvm::APSInt Value(CharBits, CharIsUnsigned);
3617 for (unsigned I = 0, N = Literal.getUDSuffixOffset(); I != N; ++I) {
3618 Value = TokSpelling[I];
3619 TemplateArgument Arg(Context, Value, Context.CharTy);
3620 TemplateArgumentLocInfo ArgInfo;
3621 ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo));
3622 }
3623 return BuildLiteralOperatorCall(R, OpNameInfo, None, TokLoc,
3624 &ExplicitArgs);
3625 }
3626 case LOLR_StringTemplate:
3627 llvm_unreachable("unexpected literal operator lookup result");
3628 }
3629 }
3630
3631 Expr *Res;
3632
3633 if (Literal.isFixedPointLiteral()) {
3634 QualType Ty;
3635
3636 if (Literal.isAccum) {
3637 if (Literal.isHalf) {
3638 Ty = Context.ShortAccumTy;
3639 } else if (Literal.isLong) {
3640 Ty = Context.LongAccumTy;
3641 } else {
3642 Ty = Context.AccumTy;
3643 }
3644 } else if (Literal.isFract) {
3645 if (Literal.isHalf) {
3646 Ty = Context.ShortFractTy;
3647 } else if (Literal.isLong) {
3648 Ty = Context.LongFractTy;
3649 } else {
3650 Ty = Context.FractTy;
3651 }
3652 }
3653
3654 if (Literal.isUnsigned) Ty = Context.getCorrespondingUnsignedType(Ty);
3655
3656 bool isSigned = !Literal.isUnsigned;
3657 unsigned scale = Context.getFixedPointScale(Ty);
3658 unsigned bit_width = Context.getTypeInfo(Ty).Width;
3659
3660 llvm::APInt Val(bit_width, 0, isSigned);
3661 bool Overflowed = Literal.GetFixedPointValue(Val, scale);
3662 bool ValIsZero = Val.isNullValue() && !Overflowed;
3663
3664 auto MaxVal = Context.getFixedPointMax(Ty).getValue();
3665 if (Literal.isFract && Val == MaxVal + 1 && !ValIsZero)
3666 // Clause 6.4.4 - The value of a constant shall be in the range of
3667 // representable values for its type, with exception for constants of a
3668 // fract type with a value of exactly 1; such a constant shall denote
3669 // the maximal value for the type.
3670 --Val;
3671 else if (Val.ugt(MaxVal) || Overflowed)
3672 Diag(Tok.getLocation(), diag::err_too_large_for_fixed_point);
3673
3674 Res = FixedPointLiteral::CreateFromRawInt(Context, Val, Ty,
3675 Tok.getLocation(), scale);
3676 } else if (Literal.isFloatingLiteral()) {
3677 QualType Ty;
3678 if (Literal.isHalf){
3679 if (getOpenCLOptions().isEnabled("cl_khr_fp16"))
3680 Ty = Context.HalfTy;
3681 else {
3682 Diag(Tok.getLocation(), diag::err_half_const_requires_fp16);
3683 return ExprError();
3684 }
3685 } else if (Literal.isFloat)
3686 Ty = Context.FloatTy;
3687 else if (Literal.isLong)
3688 Ty = Context.LongDoubleTy;
3689 else if (Literal.isFloat16)
3690 Ty = Context.Float16Ty;
3691 else if (Literal.isFloat128)
3692 Ty = Context.Float128Ty;
3693 else
3694 Ty = Context.DoubleTy;
3695
3696 Res = BuildFloatingLiteral(*this, Literal, Ty, Tok.getLocation());
3697
3698 if (Ty == Context.DoubleTy) {
3699 if (getLangOpts().SinglePrecisionConstants) {
3700 const BuiltinType *BTy = Ty->getAs<BuiltinType>();
3701 if (BTy->getKind() != BuiltinType::Float) {
3702 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).get();
3703 }
3704 } else if (getLangOpts().OpenCL &&
3705 !getOpenCLOptions().isEnabled("cl_khr_fp64")) {
3706 // Impose single-precision float type when cl_khr_fp64 is not enabled.
3707 Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64);
3708 Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).get();
3709 }
3710 }
3711 } else if (!Literal.isIntegerLiteral()) {
3712 return ExprError();
3713 } else {
3714 QualType Ty;
3715
3716 // 'long long' is a C99 or C++11 feature.
3717 if (!getLangOpts().C99 && Literal.isLongLong) {
3718 if (getLangOpts().CPlusPlus)
3719 Diag(Tok.getLocation(),
3720 getLangOpts().CPlusPlus11 ?
3721 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
3722 else
3723 Diag(Tok.getLocation(), diag::ext_c99_longlong);
3724 }
3725
3726 // Get the value in the widest-possible width.
3727 unsigned MaxWidth = Context.getTargetInfo().getIntMaxTWidth();
3728 llvm::APInt ResultVal(MaxWidth, 0);
3729
3730 if (Literal.GetIntegerValue(ResultVal)) {
3731 // If this value didn't fit into uintmax_t, error and force to ull.
3732 Diag(Tok.getLocation(), diag::err_integer_literal_too_large)
3733 << /* Unsigned */ 1;
3734 Ty = Context.UnsignedLongLongTy;
3735 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
3736 "long long is not intmax_t?");
3737 } else {
3738 // If this value fits into a ULL, try to figure out what else it fits into
3739 // according to the rules of C99 6.4.4.1p5.
3740
3741 // Octal, Hexadecimal, and integers with a U suffix are allowed to
3742 // be an unsigned int.
3743 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
3744
3745 // Check from smallest to largest, picking the smallest type we can.
3746 unsigned Width = 0;
3747
3748 // Microsoft specific integer suffixes are explicitly sized.
3749 if (Literal.MicrosoftInteger) {
3750 if (Literal.MicrosoftInteger == 8 && !Literal.isUnsigned) {
3751 Width = 8;
3752 Ty = Context.CharTy;
3753 } else {
3754 Width = Literal.MicrosoftInteger;
3755 Ty = Context.getIntTypeForBitwidth(Width,
3756 /*Signed=*/!Literal.isUnsigned);
3757 }
3758 }
3759
3760 if (Ty.isNull() && !Literal.isLong && !Literal.isLongLong) {
3761 // Are int/unsigned possibilities?
3762 unsigned IntSize = Context.getTargetInfo().getIntWidth();
3763
3764 // Does it fit in a unsigned int?
3765 if (ResultVal.isIntN(IntSize)) {
3766 // Does it fit in a signed int?
3767 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
3768 Ty = Context.IntTy;
3769 else if (AllowUnsigned)
3770 Ty = Context.UnsignedIntTy;
3771 Width = IntSize;
3772 }
3773 }
3774
3775 // Are long/unsigned long possibilities?
3776 if (Ty.isNull() && !Literal.isLongLong) {
3777 unsigned LongSize = Context.getTargetInfo().getLongWidth();
3778
3779 // Does it fit in a unsigned long?
3780 if (ResultVal.isIntN(LongSize)) {
3781 // Does it fit in a signed long?
3782 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
3783 Ty = Context.LongTy;
3784 else if (AllowUnsigned)
3785 Ty = Context.UnsignedLongTy;
3786 // Check according to the rules of C90 6.1.3.2p5. C++03 [lex.icon]p2
3787 // is compatible.
3788 else if (!getLangOpts().C99 && !getLangOpts().CPlusPlus11) {
3789 const unsigned LongLongSize =
3790 Context.getTargetInfo().getLongLongWidth();
3791 Diag(Tok.getLocation(),
3792 getLangOpts().CPlusPlus
3793 ? Literal.isLong
3794 ? diag::warn_old_implicitly_unsigned_long_cxx
3795 : /*C++98 UB*/ diag::
3796 ext_old_implicitly_unsigned_long_cxx
3797 : diag::warn_old_implicitly_unsigned_long)
3798 << (LongLongSize > LongSize ? /*will have type 'long long'*/ 0
3799 : /*will be ill-formed*/ 1);
3800 Ty = Context.UnsignedLongTy;
3801 }
3802 Width = LongSize;
3803 }
3804 }
3805
3806 // Check long long if needed.
3807 if (Ty.isNull()) {
3808 unsigned LongLongSize = Context.getTargetInfo().getLongLongWidth();
3809
3810 // Does it fit in a unsigned long long?
3811 if (ResultVal.isIntN(LongLongSize)) {
3812 // Does it fit in a signed long long?
3813 // To be compatible with MSVC, hex integer literals ending with the
3814 // LL or i64 suffix are always signed in Microsoft mode.
3815 if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 ||
3816 (getLangOpts().MSVCCompat && Literal.isLongLong)))
3817 Ty = Context.LongLongTy;
3818 else if (AllowUnsigned)
3819 Ty = Context.UnsignedLongLongTy;
3820 Width = LongLongSize;
3821 }
3822 }
3823
3824 // If we still couldn't decide a type, we probably have something that
3825 // does not fit in a signed long long, but has no U suffix.
3826 if (Ty.isNull()) {
3827 Diag(Tok.getLocation(), diag::ext_integer_literal_too_large_for_signed);
3828 Ty = Context.UnsignedLongLongTy;
3829 Width = Context.getTargetInfo().getLongLongWidth();
3830 }
3831
3832 if (ResultVal.getBitWidth() != Width)
3833 ResultVal = ResultVal.trunc(Width);
3834 }
3835 Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
3836 }
3837
3838 // If this is an imaginary literal, create the ImaginaryLiteral wrapper.
3839 if (Literal.isImaginary) {
3840 Res = new (Context) ImaginaryLiteral(Res,
3841 Context.getComplexType(Res->getType()));
3842
3843 Diag(Tok.getLocation(), diag::ext_imaginary_constant);
3844 }
3845 return Res;
3846 }
3847
3848 ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E) {
3849 assert(E && "ActOnParenExpr() missing expr");
3850 return new (Context) ParenExpr(L, R, E);
3851 }
3852
3853 static bool CheckVecStepTraitOperandType(Sema &S, QualType T,
3854 SourceLocation Loc,
3855 SourceRange ArgRange) {
3856 // [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in
3857 // scalar or vector data type argument..."
3858 // Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic
3859 // type (C99 6.2.5p18) or void.
3860 if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) {
3861 S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type)
3862 << T << ArgRange;
3863 return true;
3864 }
3865
3866 assert((T->isVoidType() || !T->isIncompleteType()) &&
3867 "Scalar types should always be complete");
3868 return false;
3869 }
3870
3871 static bool CheckExtensionTraitOperandType(Sema &S, QualType T,
3872 SourceLocation Loc,
3873 SourceRange ArgRange,
3874 UnaryExprOrTypeTrait TraitKind) {
3875 // Invalid types must be hard errors for SFINAE in C++.
3876 if (S.LangOpts.CPlusPlus)
3877 return true;
3878
3879 // C99 6.5.3.4p1:
3880 if (T->isFunctionType() &&
3881 (TraitKind == UETT_SizeOf || TraitKind == UETT_AlignOf ||
3882 TraitKind == UETT_PreferredAlignOf)) {
3883 // sizeof(function)/alignof(function) is allowed as an extension.
3884 S.Diag(Loc, diag::ext_sizeof_alignof_function_type)
3885 << TraitKind << ArgRange;
3886 return false;
3887 }
3888
3889 // Allow sizeof(void)/alignof(void) as an extension, unless in OpenCL where
3890 // this is an error (OpenCL v1.1 s6.3.k)
3891 if (T->isVoidType()) {
3892 unsigned DiagID = S.LangOpts.OpenCL ? diag::err_opencl_sizeof_alignof_type
3893 : diag::ext_sizeof_alignof_void_type;
3894 S.Diag(Loc, DiagID) << TraitKind << ArgRange;
3895 return false;
3896 }
3897
3898 return true;
3899 }
3900
3901 static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T,
3902 SourceLocation Loc,
3903 SourceRange ArgRange,
3904 UnaryExprOrTypeTrait TraitKind) {
3905 // Reject sizeof(interface) and sizeof(interface<proto>) if the
3906 // runtime doesn't allow it.
3907 if (!S.LangOpts.ObjCRuntime.allowsSizeofAlignof() && T->isObjCObjectType()) {
3908 S.Diag(Loc, diag::err_sizeof_nonfragile_interface)
3909 << T << (TraitKind == UETT_SizeOf)
3910 << ArgRange;
3911 return true;
3912 }
3913
3914 return false;
3915 }
3916
3917 /// Check whether E is a pointer from a decayed array type (the decayed
3918 /// pointer type is equal to T) and emit a warning if it is.
3919 static void warnOnSizeofOnArrayDecay(Sema &S, SourceLocation Loc, QualType T,
3920 Expr *E) {
3921 // Don't warn if the operation changed the type.
3922 if (T != E->getType())
3923 return;
3924
3925 // Now look for array decays.
3926 ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E);
3927 if (!ICE || ICE->getCastKind() != CK_ArrayToPointerDecay)
3928 return;
3929
3930 S.Diag(Loc, diag::warn_sizeof_array_decay) << ICE->getSourceRange()
3931 << ICE->getType()
3932 << ICE->getSubExpr()->getType();
3933 }
3934
3935 /// Check the constraints on expression operands to unary type expression
3936 /// and type traits.
3937 ///
3938 /// Completes any types necessary and validates the constraints on the operand
3939 /// expression. The logic mostly mirrors the type-based overload, but may modify
3940 /// the expression as it completes the type for that expression through template
3941 /// instantiation, etc.
3942 bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *E,
3943 UnaryExprOrTypeTrait ExprKind) {
3944 QualType ExprTy = E->getType();
3945 assert(!ExprTy->isReferenceType());
3946
3947 bool IsUnevaluatedOperand =
3948 (ExprKind == UETT_SizeOf || ExprKind == UETT_AlignOf ||
3949 ExprKind == UETT_PreferredAlignOf);
3950 if (IsUnevaluatedOperand) {
3951 ExprResult Result = CheckUnevaluatedOperand(E);
3952 if (Result.isInvalid())
3953 return true;
3954 E = Result.get();
3955 }
3956
3957 if (ExprKind == UETT_VecStep)
3958 return CheckVecStepTraitOperandType(*this, ExprTy, E->getExprLoc(),
3959 E->getSourceRange());
3960
3961 // Whitelist some types as extensions
3962 if (!CheckExtensionTraitOperandType(*this, ExprTy, E->getExprLoc(),
3963 E->getSourceRange(), ExprKind))
3964 return false;
3965
3966 // 'alignof' applied to an expression only requires the base element type of
3967 // the expression to be complete. 'sizeof' requires the expression's type to
3968 // be complete (and will attempt to complete it if it's an array of unknown
3969 // bound).
3970 if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf) {
3971 if (RequireCompleteType(E->getExprLoc(),
3972 Context.getBaseElementType(E->getType()),
3973 diag::err_sizeof_alignof_incomplete_type, ExprKind,
3974 E->getSourceRange()))
3975 return true;
3976 } else {
3977 if (RequireCompleteExprType(E, diag::err_sizeof_alignof_incomplete_type,
3978 ExprKind, E->getSourceRange()))
3979 return true;
3980 }
3981
3982 // Completing the expression's type may have changed it.
3983 ExprTy = E->getType();
3984 assert(!ExprTy->isReferenceType());
3985
3986 if (ExprTy->isFunctionType()) {
3987 Diag(E->getExprLoc(), diag::err_sizeof_alignof_function_type)
3988 << ExprKind << E->getSourceRange();
3989 return true;
3990 }
3991
3992 // The operand for sizeof and alignof is in an unevaluated expression context,
3993 // so side effects could result in unintended consequences.
3994 if (IsUnevaluatedOperand && !inTemplateInstantiation() &&
3995 E->HasSideEffects(Context, false))
3996 Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context);
3997
3998 if (CheckObjCTraitOperandConstraints(*this, ExprTy, E->getExprLoc(),
3999 E->getSourceRange(), ExprKind))
4000 return true;
4001
4002 if (ExprKind == UETT_SizeOf) {
4003 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParens())) {
4004 if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DeclRef->getFoundDecl())) {
4005 QualType OType = PVD->getOriginalType();
4006 QualType Type = PVD->getType();
4007 if (Type->isPointerType() && OType->isArrayType()) {
4008 Diag(E->getExprLoc(), diag::warn_sizeof_array_param)
4009 << Type << OType;
4010 Diag(PVD->getLocation(), diag::note_declared_at);
4011 }
4012 }
4013 }
4014
4015 // Warn on "sizeof(array op x)" and "sizeof(x op array)", where the array
4016 // decays into a pointer and returns an unintended result. This is most
4017 // likely a typo for "sizeof(array) op x".
4018 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E->IgnoreParens())) {
4019 warnOnSizeofOnArrayDecay(*this, BO->getOperatorLoc(), BO->getType(),
4020 BO->getLHS());
4021 warnOnSizeofOnArrayDecay(*this, BO->getOperatorLoc(), BO->getType(),
4022 BO->getRHS());
4023 }
4024 }
4025
4026 return false;
4027 }
4028
4029 /// Check the constraints on operands to unary expression and type
4030 /// traits.
4031 ///
4032 /// This will complete any types necessary, and validate the various constraints
4033 /// on those operands.
4034 ///
4035 /// The UsualUnaryConversions() function is *not* called by this routine.
4036 /// C99 6.3.2.1p[2-4] all state:
4037 /// Except when it is the operand of the sizeof operator ...
4038 ///
4039 /// C++ [expr.sizeof]p4
4040 /// The lvalue-to-rvalue, array-to-pointer, and function-to-pointer
4041 /// standard conversions are not applied to the operand of sizeof.
4042 ///
4043 /// This policy is followed for all of the unary trait expressions.
4044 bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType ExprType,
4045 SourceLocation OpLoc,
4046 SourceRange ExprRange,
4047 UnaryExprOrTypeTrait ExprKind) {
4048 if (ExprType->isDependentType())
4049 return false;
4050
4051 // C++ [expr.sizeof]p2:
4052 // When applied to a reference or a reference type, the result
4053 // is the size of the referenced type.
4054 // C++11 [expr.alignof]p3:
4055 // When alignof is applied to a reference type, the result
4056 // shall be the alignment of the referenced type.
4057 if (const ReferenceType *Ref = ExprType->getAs<ReferenceType>())
4058 ExprType = Ref->getPointeeType();
4059
4060 // C11 6.5.3.4/3, C++11 [expr.alignof]p3:
4061 // When alignof or _Alignof is applied to an array type, the result
4062 // is the alignment of the element type.
4063 if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf ||
4064 ExprKind == UETT_OpenMPRequiredSimdAlign)
4065 ExprType = Context.getBaseElementType(ExprType);
4066
4067 if (ExprKind == UETT_VecStep)
4068 return CheckVecStepTraitOperandType(*this, ExprType, OpLoc, ExprRange);
4069
4070 // Whitelist some types as extensions
4071 if (!CheckExtensionTraitOperandType(*this, ExprType, OpLoc, ExprRange,
4072 ExprKind))
4073 return false;
4074
4075 if (RequireCompleteType(OpLoc, ExprType,
4076 diag::err_sizeof_alignof_incomplete_type,
4077 ExprKind, ExprRange))
4078 return true;
4079
4080 if (ExprType->isFunctionType()) {
4081 Diag(OpLoc, diag::err_sizeof_alignof_function_type)
4082 << ExprKind << ExprRange;
4083 return true;
4084 }
4085
4086 if (CheckObjCTraitOperandConstraints(*this, ExprType, OpLoc, ExprRange,
4087 ExprKind))
4088 return true;
4089
4090 return false;
4091 }
4092
4093 static bool CheckAlignOfExpr(Sema &S, Expr *E, UnaryExprOrTypeTrait ExprKind) {
4094 // Cannot know anything else if the expression is dependent.
4095 if (E->isTypeDependent())
4096 return false;
4097
4098 if (E->getObjectKind() == OK_BitField) {
4099 S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield)
4100 << 1 << E->getSourceRange();
4101 return true;
4102 }
4103
4104 ValueDecl *D = nullptr;
4105 Expr *Inner = E->IgnoreParens();
4106 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Inner)) {
4107 D = DRE->getDecl();
4108 } else if (MemberExpr *ME = dyn_cast<MemberExpr>(Inner)) {
4109 D = ME->getMemberDecl();
4110 }
4111
4112 // If it's a field, require the containing struct to have a
4113 // complete definition so that we can compute the layout.
4114 //
4115 // This can happen in C++11 onwards, either by naming the member
4116 // in a way that is not transformed into a member access expression
4117 // (in an unevaluated operand, for instance), or by naming the member
4118 // in a trailing-return-type.
4119 //
4120 // For the record, since __alignof__ on expressions is a GCC
4121 // extension, GCC seems to permit this but always gives the
4122 // nonsensical answer 0.
4123 //
4124 // We don't really need the layout here --- we could instead just
4125 // directly check for all the appropriate alignment-lowing
4126 // attributes --- but that would require duplicating a lot of
4127 // logic that just isn't worth duplicating for such a marginal
4128 // use-case.
4129 if (FieldDecl *FD = dyn_cast_or_null<FieldDecl>(D)) {
4130 // Fast path this check, since we at least know the record has a
4131 // definition if we can find a member of it.
4132 if (!FD->getParent()->isCompleteDefinition()) {
4133 S.Diag(E->getExprLoc(), diag::err_alignof_member_of_incomplete_type)
4134 << E->getSourceRange();
4135 return true;
4136 }
4137
4138 // Otherwise, if it's a field, and the field doesn't have
4139 // reference type, then it must have a complete type (or be a
4140 // flexible array member, which we explicitly want to
4141 // white-list anyway), which makes the following checks trivial.
4142 if (!FD->getType()->isReferenceType())
4143 return false;
4144 }
4145
4146 return S.CheckUnaryExprOrTypeTraitOperand(E, ExprKind);
4147 }
4148
4149 bool Sema::CheckVecStepExpr(Expr *E) {
4150 E = E->IgnoreParens();
4151
4152 // Cannot know anything else if the expression is dependent.
4153 if (E->isTypeDependent())
4154 return false;
4155
4156 return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep);
4157 }
4158
4159 static void captureVariablyModifiedType(ASTContext &Context, QualType T,
4160 CapturingScopeInfo *CSI) {
4161 assert(T->isVariablyModifiedType());
4162 assert(CSI != nullptr);
4163
4164 // We're going to walk down into the type and look for VLA expressions.
4165 do {
4166 const Type *Ty = T.getTypePtr();
4167 switch (Ty->getTypeClass()) {
4168 #define TYPE(Class, Base)
4169 #define ABSTRACT_TYPE(Class, Base)
4170 #define NON_CANONICAL_TYPE(Class, Base)
4171 #define DEPENDENT_TYPE(Class, Base) case Type::Class:
4172 #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base)
4173 #include "clang/AST/TypeNodes.inc"
4174 T = QualType();
4175 break;
4176 // These types are never variably-modified.
4177 case Type::Builtin:
4178 case Type::Complex:
4179 case Type::Vector:
4180 case Type::ExtVector:
4181 case Type::Record:
4182 case Type::Enum:
4183 case Type::Elaborated:
4184 case Type::TemplateSpecialization:
4185 case Type::ObjCObject:
4186 case Type::ObjCInterface:
4187 case Type::ObjCObjectPointer:
4188 case Type::ObjCTypeParam:
4189 case Type::Pipe:
4190 llvm_unreachable("type class is never variably-modified!");
4191 case Type::Adjusted:
4192 T = cast<AdjustedType>(Ty)->getOriginalType();
4193 break;
4194 case Type::Decayed:
4195 T = cast<DecayedType>(Ty)->getPointeeType();
4196 break;
4197 case Type::Pointer:
4198 T = cast<PointerType>(Ty)->getPointeeType();
4199 break;
4200 case Type::BlockPointer:
4201 T = cast<BlockPointerType>(Ty)->getPointeeType();
4202 break;
4203 case Type::LValueReference:
4204 case Type::RValueReference:
4205 T = cast<ReferenceType>(Ty)->getPointeeType();
4206 break;
4207 case Type::MemberPointer:
4208 T = cast<MemberPointerType>(Ty)->getPointeeType();
4209 break;
4210 case Type::ConstantArray:
4211 case Type::IncompleteArray:
4212 // Losing element qualification here is fine.
4213 T = cast<ArrayType>(Ty)->getElementType();
4214 break;
4215 case Type::VariableArray: {
4216 // Losing element qualification here is fine.
4217 const VariableArrayType *VAT = cast<VariableArrayType>(Ty);
4218
4219 // Unknown size indication requires no size computation.
4220 // Otherwise, evaluate and record it.
4221 auto Size = VAT->getSizeExpr();
4222 if (Size && !CSI->isVLATypeCaptured(VAT) &&
4223 (isa<CapturedRegionScopeInfo>(CSI) || isa<LambdaScopeInfo>(CSI)))
4224 CSI->addVLATypeCapture(Size->getExprLoc(), VAT, Context.getSizeType());
4225
4226 T = VAT->getElementType();
4227 break;
4228 }
4229 case Type::FunctionProto:
4230 case Type::FunctionNoProto:
4231 T = cast<FunctionType>(Ty)->getReturnType();
4232 break;
4233 case Type::Paren:
4234 case Type::TypeOf:
4235 case Type::UnaryTransform:
4236 case Type::Attributed:
4237 case Type::SubstTemplateTypeParm:
4238 case Type::PackExpansion:
4239 case Type::MacroQualified:
4240 // Keep walking after single level desugaring.
4241 T = T.getSingleStepDesugaredType(Context);
4242 break;
4243 case Type::Typedef:
4244 T = cast<TypedefType>(Ty)->desugar();
4245 break;
4246 case Type::Decltype:
4247 T = cast<DecltypeType>(Ty)->desugar();
4248 break;
4249 case Type::Auto:
4250 case Type::DeducedTemplateSpecialization:
4251 T = cast<DeducedType>(Ty)->getDeducedType();
4252 break;
4253 case Type::TypeOfExpr:
4254 T = cast<TypeOfExprType>(Ty)->getUnderlyingExpr()->getType();
4255 break;
4256 case Type::Atomic:
4257 T = cast<AtomicType>(Ty)->getValueType();
4258 break;
4259 }
4260 } while (!T.isNull() && T->isVariablyModifiedType());
4261 }
4262
4263 /// Build a sizeof or alignof expression given a type operand.
4264 ExprResult
4265 Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo,
4266 SourceLocation OpLoc,
4267 UnaryExprOrTypeTrait ExprKind,
4268 SourceRange R) {
4269 if (!TInfo)
4270 return ExprError();
4271
4272 QualType T = TInfo->getType();
4273
4274 if (!T->isDependentType() &&
4275 CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind))
4276 return ExprError();
4277
4278 if (T->isVariablyModifiedType() && FunctionScopes.size() > 1) {
4279 if (auto *TT = T->getAs<TypedefType>()) {
4280 for (auto I = FunctionScopes.rbegin(),
4281 E = std::prev(FunctionScopes.rend());
4282 I != E; ++I) {
4283 auto *CSI = dyn_cast<CapturingScopeInfo>(*I);
4284 if (CSI == nullptr)
4285 break;
4286 DeclContext *DC = nullptr;
4287 if (auto *LSI = dyn_cast<LambdaScopeInfo>(CSI))
4288 DC = LSI->CallOperator;
4289 else if (auto *CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI))
4290 DC = CRSI->TheCapturedDecl;
4291 else if (auto *BSI = dyn_cast<BlockScopeInfo>(CSI))
4292 DC = BSI->TheDecl;
4293 if (DC) {
4294 if (DC->containsDecl(TT->getDecl()))
4295 break;
4296 captureVariablyModifiedType(Context, T, CSI);
4297 }
4298 }
4299 }
4300 }
4301
4302 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
4303 return new (Context) UnaryExprOrTypeTraitExpr(
4304 ExprKind, TInfo, Context.getSizeType(), OpLoc, R.getEnd());
4305 }
4306
4307 /// Build a sizeof or alignof expression given an expression
4308 /// operand.
4309 ExprResult
4310 Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc,
4311 UnaryExprOrTypeTrait ExprKind) {
4312 ExprResult PE = CheckPlaceholderExpr(E);
4313 if (PE.isInvalid())
4314 return ExprError();
4315
4316 E = PE.get();
4317
4318 // Verify that the operand is valid.
4319 bool isInvalid = false;
4320 if (E->isTypeDependent()) {
4321 // Delay type-checking for type-dependent expressions.
4322 } else if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf) {
4323 isInvalid = CheckAlignOfExpr(*this, E, ExprKind);
4324 } else if (ExprKind == UETT_VecStep) {
4325 isInvalid = CheckVecStepExpr(E);
4326 } else if (ExprKind == UETT_OpenMPRequiredSimdAlign) {
4327 Diag(E->getExprLoc(), diag::err_openmp_default_simd_align_expr);
4328 isInvalid = true;
4329 } else if (E->refersToBitField()) { // C99 6.5.3.4p1.
4330 Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 0;
4331 isInvalid = true;
4332 } else {
4333 isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf);
4334 }
4335
4336 if (isInvalid)
4337 return ExprError();
4338
4339 if (ExprKind == UETT_SizeOf && E->getType()->isVariableArrayType()) {
4340 PE = TransformToPotentiallyEvaluated(E);
4341 if (PE.isInvalid()) return ExprError();
4342 E = PE.get();
4343 }
4344
4345 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
4346 return new (Context) UnaryExprOrTypeTraitExpr(
4347 ExprKind, E, Context.getSizeType(), OpLoc, E->getSourceRange().getEnd());
4348 }
4349
4350 /// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c
4351 /// expr and the same for @c alignof and @c __alignof
4352 /// Note that the ArgRange is invalid if isType is false.
4353 ExprResult
4354 Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc,
4355 UnaryExprOrTypeTrait ExprKind, bool IsType,
4356 void *TyOrEx, SourceRange ArgRange) {
4357 // If error parsing type, ignore.
4358 if (!TyOrEx) return ExprError();
4359
4360 if (IsType) {
4361 TypeSourceInfo *TInfo;
4362 (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
4363 return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange);
4364 }
4365
4366 Expr *ArgEx = (Expr *)TyOrEx;
4367 ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind);
4368 return Result;
4369 }
4370
4371 static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc,
4372 bool IsReal) {
4373 if (V.get()->isTypeDependent())
4374 return S.Context.DependentTy;
4375
4376 // _Real and _Imag are only l-values for normal l-values.
4377 if (V.get()->getObjectKind() != OK_Ordinary) {
4378 V = S.DefaultLvalueConversion(V.get());
4379 if (V.isInvalid())
4380 return QualType();
4381 }
4382
4383 // These operators return the element type of a complex type.
4384 if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>())
4385 return CT->getElementType();
4386
4387 // Otherwise they pass through real integer and floating point types here.
4388 if (V.get()->getType()->isArithmeticType())
4389 return V.get()->getType();
4390
4391 // Test for placeholders.
4392 ExprResult PR = S.CheckPlaceholderExpr(V.get());
4393 if (PR.isInvalid()) return QualType();
4394 if (PR.get() != V.get()) {
4395 V = PR;
4396 return CheckRealImagOperand(S, V, Loc, IsReal);
4397 }
4398
4399 // Reject anything else.
4400 S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType()
4401 << (IsReal ? "__real" : "__imag");
4402 return QualType();
4403 }
4404
4405
4406
4407 ExprResult
4408 Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
4409 tok::TokenKind Kind, Expr *Input) {
4410 UnaryOperatorKind Opc;
4411 switch (Kind) {
4412 default: llvm_unreachable("Unknown unary op!");
4413 case tok::plusplus: Opc = UO_PostInc; break;
4414 case tok::minusminus: Opc = UO_PostDec; break;
4415 }
4416
4417 // Since this might is a postfix expression, get rid of ParenListExprs.
4418 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Input);
4419 if (Result.isInvalid()) return ExprError();
4420 Input = Result.get();
4421
4422 return BuildUnaryOp(S, OpLoc, Opc, Input);
4423 }
4424
4425 /// Diagnose if arithmetic on the given ObjC pointer is illegal.
4426 ///
4427 /// \return true on error
4428 static bool checkArithmeticOnObjCPointer(Sema &S,
4429 SourceLocation opLoc,
4430 Expr *op) {
4431 assert(op->getType()->isObjCObjectPointerType());
4432 if (S.LangOpts.ObjCRuntime.allowsPointerArithmetic() &&
4433 !S.LangOpts.ObjCSubscriptingLegacyRuntime)
4434 return false;
4435
4436 S.Diag(opLoc, diag::err_arithmetic_nonfragile_interface)
4437 << op->getType()->castAs<ObjCObjectPointerType>()->getPointeeType()
4438 << op->getSourceRange();
4439 return true;
4440 }
4441
4442 static bool isMSPropertySubscriptExpr(Sema &S, Expr *Base) {
4443 auto *BaseNoParens = Base->IgnoreParens();
4444 if (auto *MSProp = dyn_cast<MSPropertyRefExpr>(BaseNoParens))
4445 return MSProp->getPropertyDecl()->getType()->isArrayType();
4446 return isa<MSPropertySubscriptExpr>(BaseNoParens);
4447 }
4448
4449 ExprResult
4450 Sema::ActOnArraySubscriptExpr(Scope *S, Expr *base, SourceLocation lbLoc,
4451 Expr *idx, SourceLocation rbLoc) {
4452 if (base && !base->getType().isNull() &&
4453 base->getType()->isSpecificPlaceholderType(BuiltinType::OMPArraySection))
4454 return ActOnOMPArraySectionExpr(base, lbLoc, idx, SourceLocation(),
4455 /*Length=*/nullptr, rbLoc);
4456
4457 // Since this might be a postfix expression, get rid of ParenListExprs.
4458 if (isa<ParenListExpr>(base)) {
4459 ExprResult result = MaybeConvertParenListExprToParenExpr(S, base);
4460 if (result.isInvalid()) return ExprError();
4461 base = result.get();
4462 }
4463
4464 // A comma-expression as the index is deprecated in C++2a onwards.
4465 if (getLangOpts().CPlusPlus2a &&
4466 ((isa<BinaryOperator>(idx) && cast<BinaryOperator>(idx)->isCommaOp()) ||
4467 (isa<CXXOperatorCallExpr>(idx) &&
4468 cast<CXXOperatorCallExpr>(idx)->getOperator() == OO_Comma))) {
4469 Diag(idx->getExprLoc(), diag::warn_deprecated_comma_subscript)
4470 << SourceRange(base->getBeginLoc(), rbLoc);
4471 }
4472
4473 // Handle any non-overload placeholder types in the base and index
4474 // expressions. We can't handle overloads here because the other
4475 // operand might be an overloadable type, in which case the overload
4476 // resolution for the operator overload should get the first crack
4477 // at the overload.
4478 bool IsMSPropertySubscript = false;
4479 if (base->getType()->isNonOverloadPlaceholderType()) {
4480 IsMSPropertySubscript = isMSPropertySubscriptExpr(*this, base);
4481 if (!IsMSPropertySubscript) {
4482 ExprResult result = CheckPlaceholderExpr(base);
4483 if (result.isInvalid())
4484 return ExprError();
4485 base = result.get();
4486 }
4487 }
4488 if (idx->getType()->isNonOverloadPlaceholderType()) {
4489 ExprResult result = CheckPlaceholderExpr(idx);
4490 if (result.isInvalid()) return ExprError();
4491 idx = result.get();
4492 }
4493
4494 // Build an unanalyzed expression if either operand is type-dependent.
4495 if (getLangOpts().CPlusPlus &&
4496 (base->isTypeDependent() || idx->isTypeDependent())) {
4497 return new (Context) ArraySubscriptExpr(base, idx, Context.DependentTy,
4498 VK_LValue, OK_Ordinary, rbLoc);
4499 }
4500
4501 // MSDN, property (C++)
4502 // https://msdn.microsoft.com/en-us/library/yhfk0thd(v=vs.120).aspx
4503 // This attribute can also be used in the declaration of an empty array in a
4504 // class or structure definition. For example:
4505 // __declspec(property(get=GetX, put=PutX)) int x[];
4506 // The above statement indicates that x[] can be used with one or more array
4507 // indices. In this case, i=p->x[a][b] will be turned into i=p->GetX(a, b),
4508 // and p->x[a][b] = i will be turned into p->PutX(a, b, i);
4509 if (IsMSPropertySubscript) {
4510 // Build MS property subscript expression if base is MS property reference
4511 // or MS property subscript.
4512 return new (Context) MSPropertySubscriptExpr(
4513 base, idx, Context.PseudoObjectTy, VK_LValue, OK_Ordinary, rbLoc);
4514 }
4515
4516 // Use C++ overloaded-operator rules if either operand has record
4517 // type. The spec says to do this if either type is *overloadable*,
4518 // but enum types can't declare subscript operators or conversion
4519 // operators, so there's nothing interesting for overload resolution
4520 // to do if there aren't any record types involved.
4521 //
4522 // ObjC pointers have their own subscripting logic that is not tied
4523 // to overload resolution and so should not take this path.
4524 if (getLangOpts().CPlusPlus &&
4525 (base->getType()->isRecordType() ||
4526 (!base->getType()->isObjCObjectPointerType() &&
4527 idx->getType()->isRecordType()))) {
4528 return CreateOverloadedArraySubscriptExpr(lbLoc, rbLoc, base, idx);
4529 }
4530
4531 ExprResult Res = CreateBuiltinArraySubscriptExpr(base, lbLoc, idx, rbLoc);
4532
4533 if (!Res.isInvalid() && isa<ArraySubscriptExpr>(Res.get()))
4534 CheckSubscriptAccessOfNoDeref(cast<ArraySubscriptExpr>(Res.get()));
4535
4536 return Res;
4537 }
4538
4539 void Sema::CheckAddressOfNoDeref(const Expr *E) {
4540 ExpressionEvaluationContextRecord &LastRecord = ExprEvalContexts.back();
4541 const Expr *StrippedExpr = E->IgnoreParenImpCasts();
4542
4543 // For expressions like `&(*s).b`, the base is recorded and what should be
4544 // checked.
4545 const MemberExpr *Member = nullptr;
4546 while ((Member = dyn_cast<MemberExpr>(StrippedExpr)) && !Member->isArrow())
4547 StrippedExpr = Member->getBase()->IgnoreParenImpCasts();
4548
4549 LastRecord.PossibleDerefs.erase(StrippedExpr);
4550 }
4551
4552 void Sema::CheckSubscriptAccessOfNoDeref(const ArraySubscriptExpr *E) {
4553 QualType ResultTy = E->getType();
4554 ExpressionEvaluationContextRecord &LastRecord = ExprEvalContexts.back();
4555
4556 // Bail if the element is an array since it is not memory access.
4557 if (isa<ArrayType>(ResultTy))
4558 return;
4559
4560 if (ResultTy->hasAttr(attr::NoDeref)) {
4561 LastRecord.PossibleDerefs.insert(E);
4562 return;
4563 }
4564
4565 // Check if the base type is a pointer to a member access of a struct
4566 // marked with noderef.
4567 const Expr *Base = E->getBase();
4568 QualType BaseTy = Base->getType();
4569 if (!(isa<ArrayType>(BaseTy) || isa<PointerType>(BaseTy)))
4570 // Not a pointer access
4571 return;
4572
4573 const MemberExpr *Member = nullptr;
4574 while ((Member = dyn_cast<MemberExpr>(Base->IgnoreParenCasts())) &&
4575 Member->isArrow())
4576 Base = Member->getBase();
4577
4578 if (const auto *Ptr = dyn_cast<PointerType>(Base->getType())) {
4579 if (Ptr->getPointeeType()->hasAttr(attr::NoDeref))
4580 LastRecord.PossibleDerefs.insert(E);
4581 }
4582 }
4583
4584 ExprResult Sema::ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc,
4585 Expr *LowerBound,
4586 SourceLocation ColonLoc, Expr *Length,
4587 SourceLocation RBLoc) {
4588 if (Base->getType()->isPlaceholderType() &&
4589 !Base->getType()->isSpecificPlaceholderType(
4590 BuiltinType::OMPArraySection)) {
4591 ExprResult Result = CheckPlaceholderExpr(Base);
4592 if (Result.isInvalid())
4593 return ExprError();
4594 Base = Result.get();
4595 }
4596 if (LowerBound && LowerBound->getType()->isNonOverloadPlaceholderType()) {
4597 ExprResult Result = CheckPlaceholderExpr(LowerBound);
4598 if (Result.isInvalid())
4599 return ExprError();
4600 Result = DefaultLvalueConversion(Result.get());
4601 if (Result.isInvalid())
4602 return ExprError();
4603 LowerBound = Result.get();
4604 }
4605 if (Length && Length->getType()->isNonOverloadPlaceholderType()) {
4606 ExprResult Result = CheckPlaceholderExpr(Length);
4607 if (Result.isInvalid())
4608 return ExprError();
4609 Result = DefaultLvalueConversion(Result.get());
4610 if (Result.isInvalid())
4611 return ExprError();
4612 Length = Result.get();
4613 }
4614
4615 // Build an unanalyzed expression if either operand is type-dependent.
4616 if (Base->isTypeDependent() ||
4617 (LowerBound &&
4618 (LowerBound->isTypeDependent() || LowerBound->isValueDependent())) ||
4619 (Length && (Length->isTypeDependent() || Length->isValueDependent()))) {
4620 return new (Context)
4621 OMPArraySectionExpr(Base, LowerBound, Length, Context.DependentTy,
4622 VK_LValue, OK_Ordinary, ColonLoc, RBLoc);
4623 }
4624
4625 // Perform default conversions.
4626 QualType OriginalTy = OMPArraySectionExpr::getBaseOriginalType(Base);
4627 QualType ResultTy;
4628 if (OriginalTy->isAnyPointerType()) {
4629 ResultTy = OriginalTy->getPointeeType();
4630 } else if (OriginalTy->isArrayType()) {
4631 ResultTy = OriginalTy->getAsArrayTypeUnsafe()->getElementType();
4632 } else {
4633 return ExprError(
4634 Diag(Base->getExprLoc(), diag::err_omp_typecheck_section_value)
4635 << Base->getSourceRange());
4636 }
4637 // C99 6.5.2.1p1
4638 if (LowerBound) {
4639 auto Res = PerformOpenMPImplicitIntegerConversion(LowerBound->getExprLoc(),
4640 LowerBound);
4641 if (Res.isInvalid())
4642 return ExprError(Diag(LowerBound->getExprLoc(),
4643 diag::err_omp_typecheck_section_not_integer)
4644 << 0 << LowerBound->getSourceRange());
4645 LowerBound = Res.get();
4646
4647 if (LowerBound->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
4648 LowerBound->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
4649 Diag(LowerBound->getExprLoc(), diag::warn_omp_section_is_char)
4650 << 0 << LowerBound->getSourceRange();
4651 }
4652 if (Length) {
4653 auto Res =
4654 PerformOpenMPImplicitIntegerConversion(Length->getExprLoc(), Length);
4655 if (Res.isInvalid())
4656 return ExprError(Diag(Length->getExprLoc(),
4657 diag::err_omp_typecheck_section_not_integer)
4658 << 1 << Length->getSourceRange());
4659 Length = Res.get();
4660
4661 if (Length->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
4662 Length->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
4663 Diag(Length->getExprLoc(), diag::warn_omp_section_is_char)
4664 << 1 << Length->getSourceRange();
4665 }
4666
4667 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
4668 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
4669 // type. Note that functions are not objects, and that (in C99 parlance)
4670 // incomplete types are not object types.
4671 if (ResultTy->isFunctionType()) {
4672 Diag(Base->getExprLoc(), diag::err_omp_section_function_type)
4673 << ResultTy << Base->getSourceRange();
4674 return ExprError();
4675 }
4676
4677 if (RequireCompleteType(Base->getExprLoc(), ResultTy,
4678 diag::err_omp_section_incomplete_type, Base))
4679 return ExprError();
4680
4681 if (LowerBound && !OriginalTy->isAnyPointerType()) {
4682 Expr::EvalResult Result;
4683 if (LowerBound->EvaluateAsInt(Result, Context)) {
4684 // OpenMP 4.5, [2.4 Array Sections]
4685 // The array section must be a subset of the original array.
4686 llvm::APSInt LowerBoundValue = Result.Val.getInt();
4687 if (LowerBoundValue.isNegative()) {
4688 Diag(LowerBound->getExprLoc(), diag::err_omp_section_not_subset_of_array)
4689 << LowerBound->getSourceRange();
4690 return ExprError();
4691 }
4692 }
4693 }
4694
4695 if (Length) {
4696 Expr::EvalResult Result;
4697 if (Length->EvaluateAsInt(Result, Context)) {
4698 // OpenMP 4.5, [2.4 Array Sections]
4699 // The length must evaluate to non-negative integers.
4700 llvm::APSInt LengthValue = Result.Val.getInt();
4701 if (LengthValue.isNegative()) {
4702 Diag(Length->getExprLoc(), diag::err_omp_section_length_negative)
4703 << LengthValue.toString(/*Radix=*/10, /*Signed=*/true)
4704 << Length->getSourceRange();
4705 return ExprError();
4706 }
4707 }
4708 } else if (ColonLoc.isValid() &&
4709 (OriginalTy.isNull() || (!OriginalTy->isConstantArrayType() &&
4710 !OriginalTy->isVariableArrayType()))) {
4711 // OpenMP 4.5, [2.4 Array Sections]
4712 // When the size of the array dimension is not known, the length must be
4713 // specified explicitly.
4714 Diag(ColonLoc, diag::err_omp_section_length_undefined)
4715 << (!OriginalTy.isNull() && OriginalTy->isArrayType());
4716 return ExprError();
4717 }
4718
4719 if (!Base->getType()->isSpecificPlaceholderType(
4720 BuiltinType::OMPArraySection)) {
4721 ExprResult Result = DefaultFunctionArrayLvalueConversion(Base);
4722 if (Result.isInvalid())
4723 return ExprError();
4724 Base = Result.get();
4725 }
4726 return new (Context)
4727 OMPArraySectionExpr(Base, LowerBound, Length, Context.OMPArraySectionTy,
4728 VK_LValue, OK_Ordinary, ColonLoc, RBLoc);
4729 }
4730
4731 ExprResult
4732 Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
4733 Expr *Idx, SourceLocation RLoc) {
4734 Expr *LHSExp = Base;
4735 Expr *RHSExp = Idx;
4736
4737 ExprValueKind VK = VK_LValue;
4738 ExprObjectKind OK = OK_Ordinary;
4739
4740 // Per C++ core issue 1213, the result is an xvalue if either operand is
4741 // a non-lvalue array, and an lvalue otherwise.
4742 if (getLangOpts().CPlusPlus11) {
4743 for (auto *Op : {LHSExp, RHSExp}) {
4744 Op = Op->IgnoreImplicit();
4745 if (Op->getType()->isArrayType() && !Op->isLValue())
4746 VK = VK_XValue;
4747 }
4748 }
4749
4750 // Perform default conversions.
4751 if (!LHSExp->getType()->getAs<VectorType>()) {
4752 ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp);
4753 if (Result.isInvalid())
4754 return ExprError();
4755 LHSExp = Result.get();
4756 }
4757 ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp);
4758 if (Result.isInvalid())
4759 return ExprError();
4760 RHSExp = Result.get();
4761
4762 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
4763
4764 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
4765 // to the expression *((e1)+(e2)). This means the array "Base" may actually be
4766 // in the subscript position. As a result, we need to derive the array base
4767 // and index from the expression types.
4768 Expr *BaseExpr, *IndexExpr;
4769 QualType ResultType;
4770 if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
4771 BaseExpr = LHSExp;
4772 IndexExpr = RHSExp;
4773 ResultType = Context.DependentTy;
4774 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
4775 BaseExpr = LHSExp;
4776 IndexExpr = RHSExp;
4777 ResultType = PTy->getPointeeType();
4778 } else if (const ObjCObjectPointerType *PTy =
4779 LHSTy->getAs<ObjCObjectPointerType>()) {
4780 BaseExpr = LHSExp;
4781 IndexExpr = RHSExp;
4782
4783 // Use custom logic if this should be the pseudo-object subscript
4784 // expression.
4785 if (!LangOpts.isSubscriptPointerArithmetic())
4786 return BuildObjCSubscriptExpression(RLoc, BaseExpr, IndexExpr, nullptr,
4787 nullptr);
4788
4789 ResultType = PTy->getPointeeType();
4790 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
4791 // Handle the uncommon case of "123[Ptr]".
4792 BaseExpr = RHSExp;
4793 IndexExpr = LHSExp;
4794 ResultType = PTy->getPointeeType();
4795 } else if (const ObjCObjectPointerType *PTy =
4796 RHSTy->getAs<ObjCObjectPointerType>()) {
4797 // Handle the uncommon case of "123[Ptr]".
4798 BaseExpr = RHSExp;
4799 IndexExpr = LHSExp;
4800 ResultType = PTy->getPointeeType();
4801 if (!LangOpts.isSubscriptPointerArithmetic()) {
4802 Diag(LLoc, diag::err_subscript_nonfragile_interface)
4803 << ResultType << BaseExpr->getSourceRange();
4804 return ExprError();
4805 }
4806 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
4807 BaseExpr = LHSExp; // vectors: V[123]
4808 IndexExpr = RHSExp;
4809 // We apply C++ DR1213 to vector subscripting too.
4810 if (getLangOpts().CPlusPlus11 && LHSExp->getValueKind() == VK_RValue) {
4811 ExprResult Materialized = TemporaryMaterializationConversion(LHSExp);
4812 if (Materialized.isInvalid())
4813 return ExprError();
4814 LHSExp = Materialized.get();
4815 }
4816 VK = LHSExp->getValueKind();
4817 if (VK != VK_RValue)
4818 OK = OK_VectorComponent;
4819
4820 ResultType = VTy->getElementType();
4821 QualType BaseType = BaseExpr->getType();
4822 Qualifiers BaseQuals = BaseType.getQualifiers();
4823 Qualifiers MemberQuals = ResultType.getQualifiers();
4824 Qualifiers Combined = BaseQuals + MemberQuals;
4825 if (Combined != MemberQuals)
4826 ResultType = Context.getQualifiedType(ResultType, Combined);
4827 } else if (LHSTy->isArrayType()) {
4828 // If we see an array that wasn't promoted by
4829 // DefaultFunctionArrayLvalueConversion, it must be an array that
4830 // wasn't promoted because of the C90 rule that doesn't
4831 // allow promoting non-lvalue arrays. Warn, then
4832 // force the promotion here.
4833 Diag(LHSExp->getBeginLoc(), diag::ext_subscript_non_lvalue)
4834 << LHSExp->getSourceRange();
4835 LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
4836 CK_ArrayToPointerDecay).get();
4837 LHSTy = LHSExp->getType();
4838
4839 BaseExpr = LHSExp;
4840 IndexExpr = RHSExp;
4841 ResultType = LHSTy->getAs<PointerType>()->getPointeeType();
4842 } else if (RHSTy->isArrayType()) {
4843 // Same as previous, except for 123[f().a] case
4844 Diag(RHSExp->getBeginLoc(), diag::ext_subscript_non_lvalue)
4845 << RHSExp->getSourceRange();
4846 RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
4847 CK_ArrayToPointerDecay).get();
4848 RHSTy = RHSExp->getType();
4849
4850 BaseExpr = RHSExp;
4851 IndexExpr = LHSExp;
4852 ResultType = RHSTy->getAs<PointerType>()->getPointeeType();
4853 } else {
4854 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
4855 << LHSExp->getSourceRange() << RHSExp->getSourceRange());
4856 }
4857 // C99 6.5.2.1p1
4858 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
4859 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
4860 << IndexExpr->getSourceRange());
4861
4862 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
4863 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
4864 && !IndexExpr->isTypeDependent())
4865 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
4866
4867 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
4868 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
4869 // type. Note that Functions are not objects, and that (in C99 parlance)
4870 // incomplete types are not object types.
4871 if (ResultType->isFunctionType()) {
4872 Diag(BaseExpr->getBeginLoc(), diag::err_subscript_function_type)
4873 << ResultType << BaseExpr->getSourceRange();
4874 return ExprError();
4875 }
4876
4877 if (ResultType->isVoidType() && !getLangOpts().CPlusPlus) {
4878 // GNU extension: subscripting on pointer to void
4879 Diag(LLoc, diag::ext_gnu_subscript_void_type)
4880 << BaseExpr->getSourceRange();
4881
4882 // C forbids expressions of unqualified void type from being l-values.
4883 // See IsCForbiddenLValueType.
4884 if (!ResultType.hasQualifiers()) VK = VK_RValue;
4885 } else if (!ResultType->isDependentType() &&
4886 RequireCompleteType(LLoc, ResultType,
4887 diag::err_subscript_incomplete_type, BaseExpr))
4888 return ExprError();
4889
4890 assert(VK == VK_RValue || LangOpts.CPlusPlus ||
4891 !ResultType.isCForbiddenLValueType());
4892
4893 if (LHSExp->IgnoreParenImpCasts()->getType()->isVariablyModifiedType() &&
4894 FunctionScopes.size() > 1) {
4895 if (auto *TT =
4896 LHSExp->IgnoreParenImpCasts()->getType()->getAs<TypedefType>()) {
4897 for (auto I = FunctionScopes.rbegin(),
4898 E = std::prev(FunctionScopes.rend());
4899 I != E; ++I) {
4900 auto *CSI = dyn_cast<CapturingScopeInfo>(*I);
4901 if (CSI == nullptr)
4902 break;
4903 DeclContext *DC = nullptr;
4904 if (auto *LSI = dyn_cast<LambdaScopeInfo>(CSI))
4905 DC = LSI->CallOperator;
4906 else if (auto *CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI))
4907 DC = CRSI->TheCapturedDecl;
4908 else if (auto *BSI = dyn_cast<BlockScopeInfo>(CSI))
4909 DC = BSI->TheDecl;
4910 if (DC) {
4911 if (DC->containsDecl(TT->getDecl()))
4912 break;
4913 captureVariablyModifiedType(
4914 Context, LHSExp->IgnoreParenImpCasts()->getType(), CSI);
4915 }
4916 }
4917 }
4918 }
4919
4920 return new (Context)
4921 ArraySubscriptExpr(LHSExp, RHSExp, ResultType, VK, OK, RLoc);
4922 }
4923
4924 bool Sema::CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD,
4925 ParmVarDecl *Param) {
4926 if (Param->hasUnparsedDefaultArg()) {
4927 Diag(CallLoc,
4928 diag::err_use_of_default_argument_to_function_declared_later) <<
4929 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName();
4930 Diag(UnparsedDefaultArgLocs[Param],
4931 diag::note_default_argument_declared_here);
4932 return true;
4933 }
4934
4935 if (Param->hasUninstantiatedDefaultArg()) {
4936 Expr *UninstExpr = Param->getUninstantiatedDefaultArg();
4937
4938 EnterExpressionEvaluationContext EvalContext(
4939 *this, ExpressionEvaluationContext::PotentiallyEvaluated, Param);
4940
4941 // Instantiate the expression.
4942 //
4943 // FIXME: Pass in a correct Pattern argument, otherwise
4944 // getTemplateInstantiationArgs uses the lexical context of FD, e.g.
4945 //
4946 // template<typename T>
4947 // struct A {
4948 // static int FooImpl();
4949 //
4950 // template<typename Tp>
4951 // // bug: default argument A<T>::FooImpl() is evaluated with 2-level
4952 // // template argument list [[T], [Tp]], should be [[Tp]].
4953 // friend A<Tp> Foo(int a);
4954 // };
4955 //
4956 // template<typename T>
4957 // A<T> Foo(int a = A<T>::FooImpl());
4958 MultiLevelTemplateArgumentList MutiLevelArgList
4959 = getTemplateInstantiationArgs(FD, nullptr, /*RelativeToPrimary=*/true);
4960
4961 InstantiatingTemplate Inst(*this, CallLoc, Param,
4962 MutiLevelArgList.getInnermost());
4963 if (Inst.isInvalid())
4964 return true;
4965 if (Inst.isAlreadyInstantiating()) {
4966 Diag(Param->getBeginLoc(), diag::err_recursive_default_argument) << FD;
4967 Param->setInvalidDecl();
4968 return true;
4969 }
4970
4971 ExprResult Result;
4972 {
4973 // C++ [dcl.fct.default]p5:
4974 // The names in the [default argument] expression are bound, and
4975 // the semantic constraints are checked, at the point where the
4976 // default argument expression appears.
4977 ContextRAII SavedContext(*this, FD);
4978 LocalInstantiationScope Local(*this);
4979 runWithSufficientStackSpace(CallLoc, [&] {
4980 Result = SubstInitializer(UninstExpr, MutiLevelArgList,
4981 /*DirectInit*/false);
4982 });
4983 }
4984 if (Result.isInvalid())
4985 return true;
4986
4987 // Check the expression as an initializer for the parameter.
4988 InitializedEntity Entity
4989 = InitializedEntity::InitializeParameter(Context, Param);
4990 InitializationKind Kind = InitializationKind::CreateCopy(
4991 Param->getLocation(),
4992 /*FIXME:EqualLoc*/ UninstExpr->getBeginLoc());
4993 Expr *ResultE = Result.getAs<Expr>();
4994
4995 InitializationSequence InitSeq(*this, Entity, Kind, ResultE);
4996 Result = InitSeq.Perform(*this, Entity, Kind, ResultE);
4997 if (Result.isInvalid())
4998 return true;
4999
5000 Result =
5001 ActOnFinishFullExpr(Result.getAs<Expr>(), Param->getOuterLocStart(),
5002 /*DiscardedValue*/ false);
5003 if (Result.isInvalid())
5004 return true;
5005
5006 // Remember the instantiated default argument.
5007 Param->setDefaultArg(Result.getAs<Expr>());
5008 if (ASTMutationListener *L = getASTMutationListener()) {
5009 L->DefaultArgumentInstantiated(Param);
5010 }
5011 }
5012
5013 // If the default argument expression is not set yet, we are building it now.
5014 if (!Param->hasInit()) {
5015 Diag(Param->getBeginLoc(), diag::err_recursive_default_argument) << FD;
5016 Param->setInvalidDecl();
5017 return true;
5018 }
5019
5020 // If the default expression creates temporaries, we need to
5021 // push them to the current stack of expression temporaries so they'll
5022 // be properly destroyed.
5023 // FIXME: We should really be rebuilding the default argument with new
5024 // bound temporaries; see the comment in PR5810.
5025 // We don't need to do that with block decls, though, because
5026 // blocks in default argument expression can never capture anything.
5027 if (auto Init = dyn_cast<ExprWithCleanups>(Param->getInit())) {
5028 // Set the "needs cleanups" bit regardless of whether there are
5029 // any explicit objects.
5030 Cleanup.setExprNeedsCleanups(Init->cleanupsHaveSideEffects());
5031
5032 // Append all the objects to the cleanup list. Right now, this
5033 // should always be a no-op, because blocks in default argument
5034 // expressions should never be able to capture anything.
5035 assert(!Init->getNumObjects() &&
5036 "default argument expression has capturing blocks?");
5037 }
5038
5039 // We already type-checked the argument, so we know it works.
5040 // Just mark all of the declarations in this potentially-evaluated expression
5041 // as being "referenced".
5042 EnterExpressionEvaluationContext EvalContext(
5043 *this, ExpressionEvaluationContext::PotentiallyEvaluated, Param);
5044 MarkDeclarationsReferencedInExpr(Param->getDefaultArg(),
5045 /*SkipLocalVariables=*/true);
5046 return false;
5047 }
5048
5049 ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
5050 FunctionDecl *FD, ParmVarDecl *Param) {
5051 if (CheckCXXDefaultArgExpr(CallLoc, FD, Param))
5052 return ExprError();
5053 return CXXDefaultArgExpr::Create(Context, CallLoc, Param, CurContext);
5054 }
5055
5056 Sema::VariadicCallType
5057 Sema::getVariadicCallType(FunctionDecl *FDecl, const FunctionProtoType *Proto,
5058 Expr *Fn) {
5059 if (Proto && Proto->isVariadic()) {
5060 if (dyn_cast_or_null<CXXConstructorDecl>(FDecl))
5061 return VariadicConstructor;
5062 else if (Fn && Fn->getType()->isBlockPointerType())
5063 return VariadicBlock;
5064 else if (FDecl) {
5065 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
5066 if (Method->isInstance())
5067 return VariadicMethod;
5068 } else if (Fn && Fn->getType() == Context.BoundMemberTy)
5069 return VariadicMethod;
5070 return VariadicFunction;
5071 }
5072 return VariadicDoesNotApply;
5073 }
5074
5075 namespace {
5076 class FunctionCallCCC final : public FunctionCallFilterCCC {
5077 public:
5078 FunctionCallCCC(Sema &SemaRef, const IdentifierInfo *FuncName,
5079 unsigned NumArgs, MemberExpr *ME)
5080 : FunctionCallFilterCCC(SemaRef, NumArgs, false, ME),
5081 FunctionName(FuncName) {}
5082
5083 bool ValidateCandidate(const TypoCorrection &candidate) override {
5084 if (!candidate.getCorrectionSpecifier() ||
5085 candidate.getCorrectionAsIdentifierInfo() != FunctionName) {
5086 return false;
5087 }
5088
5089 return FunctionCallFilterCCC::ValidateCandidate(candidate);
5090 }
5091
5092 std::unique_ptr<CorrectionCandidateCallback> clone() override {
5093 return std::make_unique<FunctionCallCCC>(*this);
5094 }
5095
5096 private:
5097 const IdentifierInfo *const FunctionName;
5098 };
5099 }
5100
5101 static TypoCorrection TryTypoCorrectionForCall(Sema &S, Expr *Fn,
5102 FunctionDecl *FDecl,
5103 ArrayRef<Expr *> Args) {
5104 MemberExpr *ME = dyn_cast<MemberExpr>(Fn);
5105 DeclarationName FuncName = FDecl->getDeclName();
5106 SourceLocation NameLoc = ME ? ME->getMemberLoc() : Fn->getBeginLoc();
5107
5108 FunctionCallCCC CCC(S, FuncName.getAsIdentifierInfo(), Args.size(), ME);
5109 if (TypoCorrection Corrected = S.CorrectTypo(
5110 DeclarationNameInfo(FuncName, NameLoc), Sema::LookupOrdinaryName,
5111 S.getScopeForContext(S.CurContext), nullptr, CCC,
5112 Sema::CTK_ErrorRecovery)) {
5113 if (NamedDecl *ND = Corrected.getFoundDecl()) {
5114 if (Corrected.isOverloaded()) {
5115 OverloadCandidateSet OCS(NameLoc, OverloadCandidateSet::CSK_Normal);
5116 OverloadCandidateSet::iterator Best;
5117 for (NamedDecl *CD : Corrected) {
5118 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(CD))
5119 S.AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none), Args,
5120 OCS);
5121 }
5122 switch (OCS.BestViableFunction(S, NameLoc, Best)) {
5123 case OR_Success:
5124 ND = Best->FoundDecl;
5125 Corrected.setCorrectionDecl(ND);
5126 break;
5127 default:
5128 break;
5129 }
5130 }
5131 ND = ND->getUnderlyingDecl();
5132 if (isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND))
5133 return Corrected;
5134 }
5135 }
5136 return TypoCorrection();
5137 }
5138
5139 /// ConvertArgumentsForCall - Converts the arguments specified in
5140 /// Args/NumArgs to the parameter types of the function FDecl with
5141 /// function prototype Proto. Call is the call expression itself, and
5142 /// Fn is the function expression. For a C++ member function, this
5143 /// routine does not attempt to convert the object argument. Returns
5144 /// true if the call is ill-formed.
5145 bool
5146 Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
5147 FunctionDecl *FDecl,
5148 const FunctionProtoType *Proto,
5149 ArrayRef<Expr *> Args,
5150 SourceLocation RParenLoc,
5151 bool IsExecConfig) {
5152 // Bail out early if calling a builtin with custom typechecking.
5153 if (FDecl)
5154 if (unsigned ID = FDecl->getBuiltinID())
5155 if (Context.BuiltinInfo.hasCustomTypechecking(ID))
5156 return false;
5157
5158 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
5159 // assignment, to the types of the corresponding parameter, ...
5160 unsigned NumParams = Proto->getNumParams();
5161 bool Invalid = false;
5162 unsigned MinArgs = FDecl ? FDecl->getMinRequiredArguments() : NumParams;
5163 unsigned FnKind = Fn->getType()->isBlockPointerType()
5164 ? 1 /* block */
5165 : (IsExecConfig ? 3 /* kernel function (exec config) */
5166 : 0 /* function */);
5167
5168 // If too few arguments are available (and we don't have default
5169 // arguments for the remaining parameters), don't make the call.
5170 if (Args.size() < NumParams) {
5171 if (Args.size() < MinArgs) {
5172 TypoCorrection TC;
5173 if (FDecl && (TC = TryTypoCorrectionForCall(*this, Fn, FDecl, Args))) {
5174 unsigned diag_id =
5175 MinArgs == NumParams && !Proto->isVariadic()
5176 ? diag::err_typecheck_call_too_few_args_suggest
5177 : diag::err_typecheck_call_too_few_args_at_least_suggest;
5178 diagnoseTypo(TC, PDiag(diag_id) << FnKind << MinArgs
5179 << static_cast<unsigned>(Args.size())
5180 << TC.getCorrectionRange());
5181 } else if (MinArgs == 1 && FDecl && FDecl->getParamDecl(0)->getDeclName())
5182 Diag(RParenLoc,
5183 MinArgs == NumParams && !Proto->isVariadic()
5184 ? diag::err_typecheck_call_too_few_args_one
5185 : diag::err_typecheck_call_too_few_args_at_least_one)
5186 << FnKind << FDecl->getParamDecl(0) << Fn->getSourceRange();
5187 else
5188 Diag(RParenLoc, MinArgs == NumParams && !Proto->isVariadic()
5189 ? diag::err_typecheck_call_too_few_args
5190 : diag::err_typecheck_call_too_few_args_at_least)
5191 << FnKind << MinArgs << static_cast<unsigned>(Args.size())
5192 << Fn->getSourceRange();
5193
5194 // Emit the location of the prototype.
5195 if (!TC && FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
5196 Diag(FDecl->getBeginLoc(), diag::note_callee_decl) << FDecl;
5197
5198 return true;
5199 }
5200 // We reserve space for the default arguments when we create
5201 // the call expression, before calling ConvertArgumentsForCall.
5202 assert((Call->getNumArgs() == NumParams) &&
5203 "We should have reserved space for the default arguments before!");
5204 }
5205
5206 // If too many are passed and not variadic, error on the extras and drop
5207 // them.
5208 if (Args.size() > NumParams) {
5209 if (!Proto->isVariadic()) {
5210 TypoCorrection TC;
5211 if (FDecl && (TC = TryTypoCorrectionForCall(*this, Fn, FDecl, Args))) {
5212 unsigned diag_id =
5213 MinArgs == NumParams && !Proto->isVariadic()
5214 ? diag::err_typecheck_call_too_many_args_suggest
5215 : diag::err_typecheck_call_too_many_args_at_most_suggest;
5216 diagnoseTypo(TC, PDiag(diag_id) << FnKind << NumParams
5217 << static_cast<unsigned>(Args.size())
5218 << TC.getCorrectionRange());
5219 } else if (NumParams == 1 && FDecl &&
5220 FDecl->getParamDecl(0)->getDeclName())
5221 Diag(Args[NumParams]->getBeginLoc(),
5222 MinArgs == NumParams
5223 ? diag::err_typecheck_call_too_many_args_one
5224 : diag::err_typecheck_call_too_many_args_at_most_one)
5225 << FnKind << FDecl->getParamDecl(0)
5226 << static_cast<unsigned>(Args.size()) << Fn->getSourceRange()
5227 << SourceRange(Args[NumParams]->getBeginLoc(),
5228 Args.back()->getEndLoc());
5229 else
5230 Diag(Args[NumParams]->getBeginLoc(),
5231 MinArgs == NumParams
5232 ? diag::err_typecheck_call_too_many_args
5233 : diag::err_typecheck_call_too_many_args_at_most)
5234 << FnKind << NumParams << static_cast<unsigned>(Args.size())
5235 << Fn->getSourceRange()
5236 << SourceRange(Args[NumParams]->getBeginLoc(),
5237 Args.back()->getEndLoc());
5238
5239 // Emit the location of the prototype.
5240 if (!TC && FDecl && !FDecl->getBuiltinID() && !IsExecConfig)
5241 Diag(FDecl->getBeginLoc(), diag::note_callee_decl) << FDecl;
5242
5243 // This deletes the extra arguments.
5244 Call->shrinkNumArgs(NumParams);
5245 return true;
5246 }
5247 }
5248 SmallVector<Expr *, 8> AllArgs;
5249 VariadicCallType CallType = getVariadicCallType(FDecl, Proto, Fn);
5250
5251 Invalid = GatherArgumentsForCall(Call->getBeginLoc(), FDecl, Proto, 0, Args,
5252 AllArgs, CallType);
5253 if (Invalid)
5254 return true;
5255 unsigned TotalNumArgs = AllArgs.size();
5256 for (unsigned i = 0; i < TotalNumArgs; ++i)
5257 Call->setArg(i, AllArgs[i]);
5258
5259 return false;
5260 }
5261
5262 bool Sema::GatherArgumentsForCall(SourceLocation CallLoc, FunctionDecl *FDecl,
5263 const FunctionProtoType *Proto,
5264 unsigned FirstParam, ArrayRef<Expr *> Args,
5265 SmallVectorImpl<Expr *> &AllArgs,
5266 VariadicCallType CallType, bool AllowExplicit,
5267 bool IsListInitialization) {
5268 unsigned NumParams = Proto->getNumParams();
5269 bool Invalid = false;
5270 size_t ArgIx = 0;
5271 // Continue to check argument types (even if we have too few/many args).
5272 for (unsigned i = FirstParam; i < NumParams; i++) {
5273 QualType ProtoArgType = Proto->getParamType(i);
5274
5275 Expr *Arg;
5276 ParmVarDecl *Param = FDecl ? FDecl->getParamDecl(i) : nullptr;
5277 if (ArgIx < Args.size()) {
5278 Arg = Args[ArgIx++];
5279
5280 if (RequireCompleteType(Arg->getBeginLoc(), ProtoArgType,
5281 diag::err_call_incomplete_argument, Arg))
5282 return true;
5283
5284 // Strip the unbridged-cast placeholder expression off, if applicable.
5285 bool CFAudited = false;
5286 if (Arg->getType() == Context.ARCUnbridgedCastTy &&
5287 FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
5288 (!Param || !Param->hasAttr<CFConsumedAttr>()))
5289 Arg = stripARCUnbridgedCast(Arg);
5290 else if (getLangOpts().ObjCAutoRefCount &&
5291 FDecl && FDecl->hasAttr<CFAuditedTransferAttr>() &&
5292 (!Param || !Param->hasAttr<CFConsumedAttr>()))
5293 CFAudited = true;
5294
5295 if (Proto->getExtParameterInfo(i).isNoEscape())
5296 if (auto *BE = dyn_cast<BlockExpr>(Arg->IgnoreParenNoopCasts(Context)))
5297 BE->getBlockDecl()->setDoesNotEscape();
5298
5299 InitializedEntity Entity =
5300 Param ? InitializedEntity::InitializeParameter(Context, Param,
5301 ProtoArgType)
5302 : InitializedEntity::InitializeParameter(
5303 Context, ProtoArgType, Proto->isParamConsumed(i));
5304
5305 // Remember that parameter belongs to a CF audited API.
5306 if (CFAudited)
5307 Entity.setParameterCFAudited();
5308
5309 ExprResult ArgE = PerformCopyInitialization(
5310 Entity, SourceLocation(), Arg, IsListInitialization, AllowExplicit);
5311 if (ArgE.isInvalid())
5312 return true;
5313
5314 Arg = ArgE.getAs<Expr>();
5315 } else {
5316 assert(Param && "can't use default arguments without a known callee");
5317
5318 ExprResult ArgExpr = BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
5319 if (ArgExpr.isInvalid())
5320 return true;
5321
5322 Arg = ArgExpr.getAs<Expr>();
5323 }
5324
5325 // Check for array bounds violations for each argument to the call. This
5326 // check only triggers warnings when the argument isn't a more complex Expr
5327 // with its own checking, such as a BinaryOperator.
5328 CheckArrayAccess(Arg);
5329
5330 // Check for violations of C99 static array rules (C99 6.7.5.3p7).
5331 CheckStaticArrayArgument(CallLoc, Param, Arg);
5332
5333 AllArgs.push_back(Arg);
5334 }
5335
5336 // If this is a variadic call, handle args passed through "...".
5337 if (CallType != VariadicDoesNotApply) {
5338 // Assume that extern "C" functions with variadic arguments that
5339 // return __unknown_anytype aren't *really* variadic.
5340 if (Proto->getReturnType() == Context.UnknownAnyTy && FDecl &&
5341 FDecl->isExternC()) {
5342 for (Expr *A : Args.slice(ArgIx)) {
5343 QualType paramType; // ignored
5344 ExprResult arg = checkUnknownAnyArg(CallLoc, A, paramType);
5345 Invalid |= arg.isInvalid();
5346 AllArgs.push_back(arg.get());
5347 }
5348
5349 // Otherwise do argument promotion, (C99 6.5.2.2p7).
5350 } else {
5351 for (Expr *A : Args.slice(ArgIx)) {
5352 ExprResult Arg = DefaultVariadicArgumentPromotion(A, CallType, FDecl);
5353 Invalid |= Arg.isInvalid();
5354 // Copy blocks to the heap.
5355 if (A->getType()->isBlockPointerType())
5356 maybeExtendBlockObject(Arg);
5357 AllArgs.push_back(Arg.get());
5358 }
5359 }
5360
5361 // Check for array bounds violations.
5362 for (Expr *A : Args.slice(ArgIx))
5363 CheckArrayAccess(A);
5364 }
5365 return Invalid;
5366 }
5367
5368 static void DiagnoseCalleeStaticArrayParam(Sema &S, ParmVarDecl *PVD) {
5369 TypeLoc TL = PVD->getTypeSourceInfo()->getTypeLoc();
5370 if (DecayedTypeLoc DTL = TL.getAs<DecayedTypeLoc>())
5371 TL = DTL.getOriginalLoc();
5372 if (ArrayTypeLoc ATL = TL.getAs<ArrayTypeLoc>())
5373 S.Diag(PVD->getLocation(), diag::note_callee_static_array)
5374 << ATL.getLocalSourceRange();
5375 }
5376
5377 /// CheckStaticArrayArgument - If the given argument corresponds to a static
5378 /// array parameter, check that it is non-null, and that if it is formed by
5379 /// array-to-pointer decay, the underlying array is sufficiently large.
5380 ///
5381 /// C99 6.7.5.3p7: If the keyword static also appears within the [ and ] of the
5382 /// array type derivation, then for each call to the function, the value of the
5383 /// corresponding actual argument shall provide access to the first element of
5384 /// an array with at least as many elements as specified by the size expression.
5385 void
5386 Sema::CheckStaticArrayArgument(SourceLocation CallLoc,
5387 ParmVarDecl *Param,
5388 const Expr *ArgExpr) {
5389 // Static array parameters are not supported in C++.
5390 if (!Param || getLangOpts().CPlusPlus)
5391 return;
5392
5393 QualType OrigTy = Param->getOriginalType();
5394
5395 const ArrayType *AT = Context.getAsArrayType(OrigTy);
5396 if (!AT || AT->getSizeModifier() != ArrayType::Static)
5397 return;
5398
5399 if (ArgExpr->isNullPointerConstant(Context,
5400 Expr::NPC_NeverValueDependent)) {
5401 Diag(CallLoc, diag::warn_null_arg) << ArgExpr->getSourceRange();
5402 DiagnoseCalleeStaticArrayParam(*this, Param);
5403 return;
5404 }
5405
5406 const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT);
5407 if (!CAT)
5408 return;
5409
5410 const ConstantArrayType *ArgCAT =
5411 Context.getAsConstantArrayType(ArgExpr->IgnoreParenCasts()->getType());
5412 if (!ArgCAT)
5413 return;
5414
5415 if (getASTContext().hasSameUnqualifiedType(CAT->getElementType(),
5416 ArgCAT->getElementType())) {
5417 if (ArgCAT->getSize().ult(CAT->getSize())) {
5418 Diag(CallLoc, diag::warn_static_array_too_small)
5419 << ArgExpr->getSourceRange()
5420 << (unsigned)ArgCAT->getSize().getZExtValue()
5421 << (unsigned)CAT->getSize().getZExtValue() << 0;
5422 DiagnoseCalleeStaticArrayParam(*this, Param);
5423 }
5424 return;
5425 }
5426
5427 Optional<CharUnits> ArgSize =
5428 getASTContext().getTypeSizeInCharsIfKnown(ArgCAT);
5429 Optional<CharUnits> ParmSize = getASTContext().getTypeSizeInCharsIfKnown(CAT);
5430 if (ArgSize && ParmSize && *ArgSize < *ParmSize) {
5431 Diag(CallLoc, diag::warn_static_array_too_small)
5432 << ArgExpr->getSourceRange() << (unsigned)ArgSize->getQuantity()
5433 << (unsigned)ParmSize->getQuantity() << 1;
5434 DiagnoseCalleeStaticArrayParam(*this, Param);
5435 }
5436 }
5437
5438 /// Given a function expression of unknown-any type, try to rebuild it
5439 /// to have a function type.
5440 static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn);
5441
5442 /// Is the given type a placeholder that we need to lower out
5443 /// immediately during argument processing?
5444 static bool isPlaceholderToRemoveAsArg(QualType type) {
5445 // Placeholders are never sugared.
5446 const BuiltinType *placeholder = dyn_cast<BuiltinType>(type);
5447 if (!placeholder) return false;
5448
5449 switch (placeholder->getKind()) {
5450 // Ignore all the non-placeholder types.
5451 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
5452 case BuiltinType::Id:
5453 #include "clang/Basic/OpenCLImageTypes.def"
5454 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
5455 case BuiltinType::Id:
5456 #include "clang/Basic/OpenCLExtensionTypes.def"
5457 // In practice we'll never use this, since all SVE types are sugared
5458 // via TypedefTypes rather than exposed directly as BuiltinTypes.
5459 #define SVE_TYPE(Name, Id, SingletonId) \
5460 case BuiltinType::Id:
5461 #include "clang/Basic/AArch64SVEACLETypes.def"
5462 #define PLACEHOLDER_TYPE(ID, SINGLETON_ID)
5463 #define BUILTIN_TYPE(ID, SINGLETON_ID) case BuiltinType::ID:
5464 #include "clang/AST/BuiltinTypes.def"
5465 return false;
5466
5467 // We cannot lower out overload sets; they might validly be resolved
5468 // by the call machinery.
5469 case BuiltinType::Overload:
5470 return false;
5471
5472 // Unbridged casts in ARC can be handled in some call positions and
5473 // should be left in place.
5474 case BuiltinType::ARCUnbridgedCast:
5475 return false;
5476
5477 // Pseudo-objects should be converted as soon as possible.
5478 case BuiltinType::PseudoObject:
5479 return true;
5480
5481 // The debugger mode could theoretically but currently does not try
5482 // to resolve unknown-typed arguments based on known parameter types.
5483 case BuiltinType::UnknownAny:
5484 return true;
5485
5486 // These are always invalid as call arguments and should be reported.
5487 case BuiltinType::BoundMember:
5488 case BuiltinType::BuiltinFn:
5489 case BuiltinType::OMPArraySection:
5490 return true;
5491
5492 }
5493 llvm_unreachable("bad builtin type kind");
5494 }
5495
5496 /// Check an argument list for placeholders that we won't try to
5497 /// handle later.
5498 static bool checkArgsForPlaceholders(Sema &S, MultiExprArg args) {
5499 // Apply this processing to all the arguments at once instead of
5500 // dying at the first failure.
5501 bool hasInvalid = false;
5502 for (size_t i = 0, e = args.size(); i != e; i++) {
5503 if (isPlaceholderToRemoveAsArg(args[i]->getType())) {
5504 ExprResult result = S.CheckPlaceholderExpr(args[i]);
5505 if (result.isInvalid()) hasInvalid = true;
5506 else args[i] = result.get();
5507 } else if (hasInvalid) {
5508 (void)S.CorrectDelayedTyposInExpr(args[i]);
5509 }
5510 }
5511 return hasInvalid;
5512 }
5513
5514 /// If a builtin function has a pointer argument with no explicit address
5515 /// space, then it should be able to accept a pointer to any address
5516 /// space as input. In order to do this, we need to replace the
5517 /// standard builtin declaration with one that uses the same address space
5518 /// as the call.
5519 ///
5520 /// \returns nullptr If this builtin is not a candidate for a rewrite i.e.
5521 /// it does not contain any pointer arguments without
5522 /// an address space qualifer. Otherwise the rewritten
5523 /// FunctionDecl is returned.
5524 /// TODO: Handle pointer return types.
5525 static FunctionDecl *rewriteBuiltinFunctionDecl(Sema *Sema, ASTContext &Context,
5526 FunctionDecl *FDecl,
5527 MultiExprArg ArgExprs) {
5528
5529 QualType DeclType = FDecl->getType();
5530 const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(DeclType);
5531
5532 if (!Context.BuiltinInfo.hasPtrArgsOrResult(FDecl->getBuiltinID()) || !FT ||
5533 ArgExprs.size() < FT->getNumParams())
5534 return nullptr;
5535
5536 bool NeedsNewDecl = false;
5537 unsigned i = 0;
5538 SmallVector<QualType, 8> OverloadParams;
5539
5540 for (QualType ParamType : FT->param_types()) {
5541
5542 // Convert array arguments to pointer to simplify type lookup.
5543 ExprResult ArgRes =
5544 Sema->DefaultFunctionArrayLvalueConversion(ArgExprs[i++]);
5545 if (ArgRes.isInvalid())
5546 return nullptr;
5547 Expr *Arg = ArgRes.get();
5548 QualType ArgType = Arg->getType();
5549 if (!ParamType->isPointerType() ||
5550 ParamType.hasAddressSpace() ||
5551 !ArgType->isPointerType() ||
5552 !ArgType->getPointeeType().hasAddressSpace()) {
5553 OverloadParams.push_back(ParamType);
5554 continue;
5555 }
5556
5557 QualType PointeeType = ParamType->getPointeeType();
5558 if (PointeeType.hasAddressSpace())
5559 continue;
5560
5561 NeedsNewDecl = true;
5562 LangAS AS = ArgType->getPointeeType().getAddressSpace();
5563
5564 PointeeType = Context.getAddrSpaceQualType(PointeeType, AS);
5565 OverloadParams.push_back(Context.getPointerType(PointeeType));
5566 }
5567
5568 if (!NeedsNewDecl)
5569 return nullptr;
5570
5571 FunctionProtoType::ExtProtoInfo EPI;
5572 EPI.Variadic = FT->isVariadic();
5573 QualType OverloadTy = Context.getFunctionType(FT->getReturnType(),
5574 OverloadParams, EPI);
5575 DeclContext *Parent = FDecl->getParent();
5576 FunctionDecl *OverloadDecl = FunctionDecl::Create(Context, Parent,
5577 FDecl->getLocation(),
5578 FDecl->getLocation(),
5579 FDecl->getIdentifier(),
5580 OverloadTy,
5581 /*TInfo=*/nullptr,
5582 SC_Extern, false,
5583 /*hasPrototype=*/true);
5584 SmallVector<ParmVarDecl*, 16> Params;
5585 FT = cast<FunctionProtoType>(OverloadTy);
5586 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
5587 QualType ParamType = FT->getParamType(i);
5588 ParmVarDecl *Parm =
5589 ParmVarDecl::Create(Context, OverloadDecl, SourceLocation(),
5590 SourceLocation(), nullptr, ParamType,
5591 /*TInfo=*/nullptr, SC_None, nullptr);
5592 Parm->setScopeInfo(0, i);
5593 Params.push_back(Parm);
5594 }
5595 OverloadDecl->setParams(Params);
5596 return OverloadDecl;
5597 }
5598
5599 static void checkDirectCallValidity(Sema &S, const Expr *Fn,
5600 FunctionDecl *Callee,
5601 MultiExprArg ArgExprs) {
5602 // `Callee` (when called with ArgExprs) may be ill-formed. enable_if (and
5603 // similar attributes) really don't like it when functions are called with an
5604 // invalid number of args.
5605 if (S.TooManyArguments(Callee->getNumParams(), ArgExprs.size(),
5606 /*PartialOverloading=*/false) &&
5607 !Callee->isVariadic())
5608 return;
5609 if (Callee->getMinRequiredArguments() > ArgExprs.size())
5610 return;
5611
5612 if (const EnableIfAttr *Attr = S.CheckEnableIf(Callee, ArgExprs, true)) {
5613 S.Diag(Fn->getBeginLoc(),
5614 isa<CXXMethodDecl>(Callee)
5615 ? diag::err_ovl_no_viable_member_function_in_call
5616 : diag::err_ovl_no_viable_function_in_call)
5617 << Callee << Callee->getSourceRange();
5618 S.Diag(Callee->getLocation(),
5619 diag::note_ovl_candidate_disabled_by_function_cond_attr)
5620 << Attr->getCond()->getSourceRange() << Attr->getMessage();
5621 return;
5622 }
5623 }
5624
5625 static bool enclosingClassIsRelatedToClassInWhichMembersWereFound(
5626 const UnresolvedMemberExpr *const UME, Sema &S) {
5627
5628 const auto GetFunctionLevelDCIfCXXClass =
5629 [](Sema &S) -> const CXXRecordDecl * {
5630 const DeclContext *const DC = S.getFunctionLevelDeclContext();
5631 if (!DC || !DC->getParent())
5632 return nullptr;
5633
5634 // If the call to some member function was made from within a member
5635 // function body 'M' return return 'M's parent.
5636 if (const auto *MD = dyn_cast<CXXMethodDecl>(DC))
5637 return MD->getParent()->getCanonicalDecl();
5638 // else the call was made from within a default member initializer of a
5639 // class, so return the class.
5640 if (const auto *RD = dyn_cast<CXXRecordDecl>(DC))
5641 return RD->getCanonicalDecl();
5642 return nullptr;
5643 };
5644 // If our DeclContext is neither a member function nor a class (in the
5645 // case of a lambda in a default member initializer), we can't have an
5646 // enclosing 'this'.
5647
5648 const CXXRecordDecl *const CurParentClass = GetFunctionLevelDCIfCXXClass(S);
5649 if (!CurParentClass)
5650 return false;
5651
5652 // The naming class for implicit member functions call is the class in which
5653 // name lookup starts.
5654 const CXXRecordDecl *const NamingClass =
5655 UME->getNamingClass()->getCanonicalDecl();
5656 assert(NamingClass && "Must have naming class even for implicit access");
5657
5658 // If the unresolved member functions were found in a 'naming class' that is
5659 // related (either the same or derived from) to the class that contains the
5660 // member function that itself contained the implicit member access.
5661
5662 return CurParentClass == NamingClass ||
5663 CurParentClass->isDerivedFrom(NamingClass);
5664 }
5665
5666 static void
5667 tryImplicitlyCaptureThisIfImplicitMemberFunctionAccessWithDependentArgs(
5668 Sema &S, const UnresolvedMemberExpr *const UME, SourceLocation CallLoc) {
5669
5670 if (!UME)
5671 return;
5672
5673 LambdaScopeInfo *const CurLSI = S.getCurLambda();
5674 // Only try and implicitly capture 'this' within a C++ Lambda if it hasn't
5675 // already been captured, or if this is an implicit member function call (if
5676 // it isn't, an attempt to capture 'this' should already have been made).
5677 if (!CurLSI || CurLSI->ImpCaptureStyle == CurLSI->ImpCap_None ||
5678 !UME->isImplicitAccess() || CurLSI->isCXXThisCaptured())
5679 return;
5680
5681 // Check if the naming class in which the unresolved members were found is
5682 // related (same as or is a base of) to the enclosing class.
5683
5684 if (!enclosingClassIsRelatedToClassInWhichMembersWereFound(UME, S))
5685 return;
5686
5687
5688 DeclContext *EnclosingFunctionCtx = S.CurContext->getParent()->getParent();
5689 // If the enclosing function is not dependent, then this lambda is
5690 // capture ready, so if we can capture this, do so.
5691 if (!EnclosingFunctionCtx->isDependentContext()) {
5692 // If the current lambda and all enclosing lambdas can capture 'this' -
5693 // then go ahead and capture 'this' (since our unresolved overload set
5694 // contains at least one non-static member function).
5695 if (!S.CheckCXXThisCapture(CallLoc, /*Explcit*/ false, /*Diagnose*/ false))
5696 S.CheckCXXThisCapture(CallLoc);
5697 } else if (S.CurContext->isDependentContext()) {
5698 // ... since this is an implicit member reference, that might potentially
5699 // involve a 'this' capture, mark 'this' for potential capture in
5700 // enclosing lambdas.
5701 if (CurLSI->ImpCaptureStyle != CurLSI->ImpCap_None)
5702 CurLSI->addPotentialThisCapture(CallLoc);
5703 }
5704 }
5705
5706 ExprResult Sema::ActOnCallExpr(Scope *Scope, Expr *Fn, SourceLocation LParenLoc,
5707 MultiExprArg ArgExprs, SourceLocation RParenLoc,
5708 Expr *ExecConfig) {
5709 ExprResult Call =
5710 BuildCallExpr(Scope, Fn, LParenLoc, ArgExprs, RParenLoc, ExecConfig);
5711 if (Call.isInvalid())
5712 return Call;
5713
5714 // Diagnose uses of the C++20 "ADL-only template-id call" feature in earlier
5715 // language modes.
5716 if (auto *ULE = dyn_cast<UnresolvedLookupExpr>(Fn)) {
5717 if (ULE->hasExplicitTemplateArgs() &&
5718 ULE->decls_begin() == ULE->decls_end()) {
5719 Diag(Fn->getExprLoc(), getLangOpts().CPlusPlus2a
5720 ? diag::warn_cxx17_compat_adl_only_template_id
5721 : diag::ext_adl_only_template_id)
5722 << ULE->getName();
5723 }
5724 }
5725
5726 return Call;
5727 }
5728
5729 /// BuildCallExpr - Handle a call to Fn with the specified array of arguments.
5730 /// This provides the location of the left/right parens and a list of comma
5731 /// locations.
5732 ExprResult Sema::BuildCallExpr(Scope *Scope, Expr *Fn, SourceLocation LParenLoc,
5733 MultiExprArg ArgExprs, SourceLocation RParenLoc,
5734 Expr *ExecConfig, bool IsExecConfig) {
5735 // Since this might be a postfix expression, get rid of ParenListExprs.
5736 ExprResult Result = MaybeConvertParenListExprToParenExpr(Scope, Fn);
5737 if (Result.isInvalid()) return ExprError();
5738 Fn = Result.get();
5739
5740 if (checkArgsForPlaceholders(*this, ArgExprs))
5741 return ExprError();
5742
5743 if (getLangOpts().CPlusPlus) {
5744 // If this is a pseudo-destructor expression, build the call immediately.
5745 if (isa<CXXPseudoDestructorExpr>(Fn)) {
5746 if (!ArgExprs.empty()) {
5747 // Pseudo-destructor calls should not have any arguments.
5748 Diag(Fn->getBeginLoc(), diag::err_pseudo_dtor_call_with_args)
5749 << FixItHint::CreateRemoval(
5750 SourceRange(ArgExprs.front()->getBeginLoc(),
5751 ArgExprs.back()->getEndLoc()));
5752 }
5753
5754 return CallExpr::Create(Context, Fn, /*Args=*/{}, Context.VoidTy,
5755 VK_RValue, RParenLoc);
5756 }
5757 if (Fn->getType() == Context.PseudoObjectTy) {
5758 ExprResult result = CheckPlaceholderExpr(Fn);
5759 if (result.isInvalid()) return ExprError();
5760 Fn = result.get();
5761 }
5762
5763 // Determine whether this is a dependent call inside a C++ template,
5764 // in which case we won't do any semantic analysis now.
5765 if (Fn->isTypeDependent() || Expr::hasAnyTypeDependentArguments(ArgExprs)) {
5766 if (ExecConfig) {
5767 return CUDAKernelCallExpr::Create(
5768 Context, Fn, cast<CallExpr>(ExecConfig), ArgExprs,
5769 Context.DependentTy, VK_RValue, RParenLoc);
5770 } else {
5771
5772 tryImplicitlyCaptureThisIfImplicitMemberFunctionAccessWithDependentArgs(
5773 *this, dyn_cast<UnresolvedMemberExpr>(Fn->IgnoreParens()),
5774 Fn->getBeginLoc());
5775
5776 return CallExpr::Create(Context, Fn, ArgExprs, Context.DependentTy,
5777 VK_RValue, RParenLoc);
5778 }
5779 }
5780
5781 // Determine whether this is a call to an object (C++ [over.call.object]).
5782 if (Fn->getType()->isRecordType())
5783 return BuildCallToObjectOfClassType(Scope, Fn, LParenLoc, ArgExprs,
5784 RParenLoc);
5785
5786 if (Fn->getType() == Context.UnknownAnyTy) {
5787 ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
5788 if (result.isInvalid()) return ExprError();
5789 Fn = result.get();
5790 }
5791
5792 if (Fn->getType() == Context.BoundMemberTy) {
5793 return BuildCallToMemberFunction(Scope, Fn, LParenLoc, ArgExprs,
5794 RParenLoc);
5795 }
5796 }
5797
5798 // Check for overloaded calls. This can happen even in C due to extensions.
5799 if (Fn->getType() == Context.OverloadTy) {
5800 OverloadExpr::FindResult find = OverloadExpr::find(Fn);
5801
5802 // We aren't supposed to apply this logic if there's an '&' involved.
5803 if (!find.HasFormOfMemberPointer) {
5804 if (Expr::hasAnyTypeDependentArguments(ArgExprs))
5805 return CallExpr::Create(Context, Fn, ArgExprs, Context.DependentTy,
5806 VK_RValue, RParenLoc);
5807 OverloadExpr *ovl = find.Expression;
5808 if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(ovl))
5809 return BuildOverloadedCallExpr(
5810 Scope, Fn, ULE, LParenLoc, ArgExprs, RParenLoc, ExecConfig,
5811 /*AllowTypoCorrection=*/true, find.IsAddressOfOperand);
5812 return BuildCallToMemberFunction(Scope, Fn, LParenLoc, ArgExprs,
5813 RParenLoc);
5814 }
5815 }
5816
5817 // If we're directly calling a function, get the appropriate declaration.
5818 if (Fn->getType() == Context.UnknownAnyTy) {
5819 ExprResult result = rebuildUnknownAnyFunction(*this, Fn);
5820 if (result.isInvalid()) return ExprError();
5821 Fn = result.get();
5822 }
5823
5824 Expr *NakedFn = Fn->IgnoreParens();
5825
5826 bool CallingNDeclIndirectly = false;
5827 NamedDecl *NDecl = nullptr;
5828 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn)) {
5829 if (UnOp->getOpcode() == UO_AddrOf) {
5830 CallingNDeclIndirectly = true;
5831 NakedFn = UnOp->getSubExpr()->IgnoreParens();
5832 }
5833 }
5834
5835 if (auto *DRE = dyn_cast<DeclRefExpr>(NakedFn)) {
5836 NDecl = DRE->getDecl();
5837
5838 FunctionDecl *FDecl = dyn_cast<FunctionDecl>(NDecl);
5839 if (FDecl && FDecl->getBuiltinID()) {
5840 // Rewrite the function decl for this builtin by replacing parameters
5841 // with no explicit address space with the address space of the arguments
5842 // in ArgExprs.
5843 if ((FDecl =
5844 rewriteBuiltinFunctionDecl(this, Context, FDecl, ArgExprs))) {
5845 NDecl = FDecl;
5846 Fn = DeclRefExpr::Create(
5847 Context, FDecl->getQualifierLoc(), SourceLocation(), FDecl, false,
5848 SourceLocation(), FDecl->getType(), Fn->getValueKind(), FDecl,
5849 nullptr, DRE->isNonOdrUse());
5850 }
5851 }
5852 } else if (isa<MemberExpr>(NakedFn))
5853 NDecl = cast<MemberExpr>(NakedFn)->getMemberDecl();
5854
5855 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(NDecl)) {
5856 if (CallingNDeclIndirectly && !checkAddressOfFunctionIsAvailable(
5857 FD, /*Complain=*/true, Fn->getBeginLoc()))
5858 return ExprError();
5859
5860 if (getLangOpts().OpenCL && checkOpenCLDisabledDecl(*FD, *Fn))
5861 return ExprError();
5862
5863 checkDirectCallValidity(*this, Fn, FD, ArgExprs);
5864 }
5865
5866 return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, ArgExprs, RParenLoc,
5867 ExecConfig, IsExecConfig);
5868 }
5869
5870 /// ActOnAsTypeExpr - create a new asType (bitcast) from the arguments.
5871 ///
5872 /// __builtin_astype( value, dst type )
5873 ///
5874 ExprResult Sema::ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy,
5875 SourceLocation BuiltinLoc,
5876 SourceLocation RParenLoc) {
5877 ExprValueKind VK = VK_RValue;
5878 ExprObjectKind OK = OK_Ordinary;
5879 QualType DstTy = GetTypeFromParser(ParsedDestTy);
5880 QualType SrcTy = E->getType();
5881 if (Context.getTypeSize(DstTy) != Context.getTypeSize(SrcTy))
5882 return ExprError(Diag(BuiltinLoc,
5883 diag::err_invalid_astype_of_different_size)
5884 << DstTy
5885 << SrcTy
5886 << E->getSourceRange());
5887 return new (Context) AsTypeExpr(E, DstTy, VK, OK, BuiltinLoc, RParenLoc);
5888 }
5889
5890 /// ActOnConvertVectorExpr - create a new convert-vector expression from the
5891 /// provided arguments.
5892 ///
5893 /// __builtin_convertvector( value, dst type )
5894 ///
5895 ExprResult Sema::ActOnConvertVectorExpr(Expr *E, ParsedType ParsedDestTy,
5896 SourceLocation BuiltinLoc,
5897 SourceLocation RParenLoc) {
5898 TypeSourceInfo *TInfo;
5899 GetTypeFromParser(ParsedDestTy, &TInfo);
5900 return SemaConvertVectorExpr(E, TInfo, BuiltinLoc, RParenLoc);
5901 }
5902
5903 /// BuildResolvedCallExpr - Build a call to a resolved expression,
5904 /// i.e. an expression not of \p OverloadTy. The expression should
5905 /// unary-convert to an expression of function-pointer or
5906 /// block-pointer type.
5907 ///
5908 /// \param NDecl the declaration being called, if available
5909 ExprResult Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
5910 SourceLocation LParenLoc,
5911 ArrayRef<Expr *> Args,
5912 SourceLocation RParenLoc, Expr *Config,
5913 bool IsExecConfig, ADLCallKind UsesADL) {
5914 FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
5915 unsigned BuiltinID = (FDecl ? FDecl->getBuiltinID() : 0);
5916
5917 // Functions with 'interrupt' attribute cannot be called directly.
5918 if (FDecl && FDecl->hasAttr<AnyX86InterruptAttr>()) {
5919 Diag(Fn->getExprLoc(), diag::err_anyx86_interrupt_called);
5920 return ExprError();
5921 }
5922
5923 // Interrupt handlers don't save off the VFP regs automatically on ARM,
5924 // so there's some risk when calling out to non-interrupt handler functions
5925 // that the callee might not preserve them. This is easy to diagnose here,
5926 // but can be very challenging to debug.
5927 if (auto *Caller = getCurFunctionDecl())
5928 if (Caller->hasAttr<ARMInterruptAttr>()) {
5929 bool VFP = Context.getTargetInfo().hasFeature("vfp");
5930 if (VFP && (!FDecl || !FDecl->hasAttr<ARMInterruptAttr>()))
5931 Diag(Fn->getExprLoc(), diag::warn_arm_interrupt_calling_convention);
5932 }
5933
5934 // Promote the function operand.
5935 // We special-case function promotion here because we only allow promoting
5936 // builtin functions to function pointers in the callee of a call.
5937 ExprResult Result;
5938 QualType ResultTy;
5939 if (BuiltinID &&
5940 Fn->getType()->isSpecificBuiltinType(BuiltinType::BuiltinFn)) {
5941 // Extract the return type from the (builtin) function pointer type.
5942 // FIXME Several builtins still have setType in
5943 // Sema::CheckBuiltinFunctionCall. One should review their definitions in
5944 // Builtins.def to ensure they are correct before removing setType calls.
5945 QualType FnPtrTy = Context.getPointerType(FDecl->getType());
5946 Result = ImpCastExprToType(Fn, FnPtrTy, CK_BuiltinFnToFnPtr).get();
5947 ResultTy = FDecl->getCallResultType();
5948 } else {
5949 Result = CallExprUnaryConversions(Fn);
5950 ResultTy = Context.BoolTy;
5951 }
5952 if (Result.isInvalid())
5953 return ExprError();
5954 Fn = Result.get();
5955
5956 // Check for a valid function type, but only if it is not a builtin which
5957 // requires custom type checking. These will be handled by
5958 // CheckBuiltinFunctionCall below just after creation of the call expression.
5959 const FunctionType *FuncT = nullptr;
5960 if (!BuiltinID || !Context.BuiltinInfo.hasCustomTypechecking(BuiltinID)) {
5961 retry:
5962 if (const PointerType *PT = Fn->getType()->getAs<PointerType>()) {
5963 // C99 6.5.2.2p1 - "The expression that denotes the called function shall
5964 // have type pointer to function".
5965 FuncT = PT->getPointeeType()->getAs<FunctionType>();
5966 if (!FuncT)
5967 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
5968 << Fn->getType() << Fn->getSourceRange());
5969 } else if (const BlockPointerType *BPT =
5970 Fn->getType()->getAs<BlockPointerType>()) {
5971 FuncT = BPT->getPointeeType()->castAs<FunctionType>();
5972 } else {
5973 // Handle calls to expressions of unknown-any type.
5974 if (Fn->getType() == Context.UnknownAnyTy) {
5975 ExprResult rewrite = rebuildUnknownAnyFunction(*this, Fn);
5976 if (rewrite.isInvalid())
5977 return ExprError();
5978 Fn = rewrite.get();
5979 goto retry;
5980 }
5981
5982 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
5983 << Fn->getType() << Fn->getSourceRange());
5984 }
5985 }
5986
5987 // Get the number of parameters in the function prototype, if any.
5988 // We will allocate space for max(Args.size(), NumParams) arguments
5989 // in the call expression.
5990 const auto *Proto = dyn_cast_or_null<FunctionProtoType>(FuncT);
5991 unsigned NumParams = Proto ? Proto->getNumParams() : 0;
5992
5993 CallExpr *TheCall;
5994 if (Config) {
5995 assert(UsesADL == ADLCallKind::NotADL &&
5996 "CUDAKernelCallExpr should not use ADL");
5997 TheCall =
5998 CUDAKernelCallExpr::Create(Context, Fn, cast<CallExpr>(Config), Args,
5999 ResultTy, VK_RValue, RParenLoc, NumParams);
6000 } else {
6001 TheCall = CallExpr::Create(Context, Fn, Args, ResultTy, VK_RValue,
6002 RParenLoc, NumParams, UsesADL);
6003 }
6004
6005 if (!getLangOpts().CPlusPlus) {
6006 // Forget about the nulled arguments since typo correction
6007 // do not handle them well.
6008 TheCall->shrinkNumArgs(Args.size());
6009 // C cannot always handle TypoExpr nodes in builtin calls and direct
6010 // function calls as their argument checking don't necessarily handle
6011 // dependent types properly, so make sure any TypoExprs have been
6012 // dealt with.
6013 ExprResult Result = CorrectDelayedTyposInExpr(TheCall);
6014 if (!Result.isUsable()) return ExprError();
6015 CallExpr *TheOldCall = TheCall;
6016 TheCall = dyn_cast<CallExpr>(Result.get());
6017 bool CorrectedTypos = TheCall != TheOldCall;
6018 if (!TheCall) return Result;
6019 Args = llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs());
6020
6021 // A new call expression node was created if some typos were corrected.
6022 // However it may not have been constructed with enough storage. In this
6023 // case, rebuild the node with enough storage. The waste of space is
6024 // immaterial since this only happens when some typos were corrected.
6025 if (CorrectedTypos && Args.size() < NumParams) {
6026 if (Config)
6027 TheCall = CUDAKernelCallExpr::Create(
6028 Context, Fn, cast<CallExpr>(Config), Args, ResultTy, VK_RValue,
6029 RParenLoc, NumParams);
6030 else
6031 TheCall = CallExpr::Create(Context, Fn, Args, ResultTy, VK_RValue,
6032 RParenLoc, NumParams, UsesADL);
6033 }
6034 // We can now handle the nulled arguments for the default arguments.
6035 TheCall->setNumArgsUnsafe(std::max<unsigned>(Args.size(), NumParams));
6036 }
6037
6038 // Bail out early if calling a builtin with custom type checking.
6039 if (BuiltinID && Context.BuiltinInfo.hasCustomTypechecking(BuiltinID))
6040 return CheckBuiltinFunctionCall(FDecl, BuiltinID, TheCall);
6041
6042 if (getLangOpts().CUDA) {
6043 if (Config) {
6044 // CUDA: Kernel calls must be to global functions
6045 if (FDecl && !FDecl->hasAttr<CUDAGlobalAttr>())
6046 return ExprError(Diag(LParenLoc,diag::err_kern_call_not_global_function)
6047 << FDecl << Fn->getSourceRange());
6048
6049 // CUDA: Kernel function must have 'void' return type
6050 if (!FuncT->getReturnType()->isVoidType() &&
6051 !FuncT->getReturnType()->getAs<AutoType>() &&
6052 !FuncT->getReturnType()->isInstantiationDependentType())
6053 return ExprError(Diag(LParenLoc, diag::err_kern_type_not_void_return)
6054 << Fn->getType() << Fn->getSourceRange());
6055 } else {
6056 // CUDA: Calls to global functions must be configured
6057 if (FDecl && FDecl->hasAttr<CUDAGlobalAttr>())
6058 return ExprError(Diag(LParenLoc, diag::err_global_call_not_config)
6059 << FDecl << Fn->getSourceRange());
6060 }
6061 }
6062
6063 // Check for a valid return type
6064 if (CheckCallReturnType(FuncT->getReturnType(), Fn->getBeginLoc(), TheCall,
6065 FDecl))
6066 return ExprError();
6067
6068 // We know the result type of the call, set it.
6069 TheCall->setType(FuncT->getCallResultType(Context));
6070 TheCall->setValueKind(Expr::getValueKindForType(FuncT->getReturnType()));
6071
6072 if (Proto) {
6073 if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, RParenLoc,
6074 IsExecConfig))
6075 return ExprError();
6076 } else {
6077 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
6078
6079 if (FDecl) {
6080 // Check if we have too few/too many template arguments, based
6081 // on our knowledge of the function definition.
6082 const FunctionDecl *Def = nullptr;
6083 if (FDecl->hasBody(Def) && Args.size() != Def->param_size()) {
6084 Proto = Def->getType()->getAs<FunctionProtoType>();
6085 if (!Proto || !(Proto->isVariadic() && Args.size() >= Def->param_size()))
6086 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
6087 << (Args.size() > Def->param_size()) << FDecl << Fn->getSourceRange();
6088 }
6089
6090 // If the function we're calling isn't a function prototype, but we have
6091 // a function prototype from a prior declaratiom, use that prototype.
6092 if (!FDecl->hasPrototype())
6093 Proto = FDecl->getType()->getAs<FunctionProtoType>();
6094 }
6095
6096 // Promote the arguments (C99 6.5.2.2p6).
6097 for (unsigned i = 0, e = Args.size(); i != e; i++) {
6098 Expr *Arg = Args[i];
6099
6100 if (Proto && i < Proto->getNumParams()) {
6101 InitializedEntity Entity = InitializedEntity::InitializeParameter(
6102 Context, Proto->getParamType(i), Proto->isParamConsumed(i));
6103 ExprResult ArgE =
6104 PerformCopyInitialization(Entity, SourceLocation(), Arg);
6105 if (ArgE.isInvalid())
6106 return true;
6107
6108 Arg = ArgE.getAs<Expr>();
6109
6110 } else {
6111 ExprResult ArgE = DefaultArgumentPromotion(Arg);
6112
6113 if (ArgE.isInvalid())
6114 return true;
6115
6116 Arg = ArgE.getAs<Expr>();
6117 }
6118
6119 if (RequireCompleteType(Arg->getBeginLoc(), Arg->getType(),
6120 diag::err_call_incomplete_argument, Arg))
6121 return ExprError();
6122
6123 TheCall->setArg(i, Arg);
6124 }
6125 }
6126
6127 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
6128 if (!Method->isStatic())
6129 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
6130 << Fn->getSourceRange());
6131
6132 // Check for sentinels
6133 if (NDecl)
6134 DiagnoseSentinelCalls(NDecl, LParenLoc, Args);
6135
6136 // Do special checking on direct calls to functions.
6137 if (FDecl) {
6138 if (CheckFunctionCall(FDecl, TheCall, Proto))
6139 return ExprError();
6140
6141 checkFortifiedBuiltinMemoryFunction(FDecl, TheCall);
6142
6143 if (BuiltinID)
6144 return CheckBuiltinFunctionCall(FDecl, BuiltinID, TheCall);
6145 } else if (NDecl) {
6146 if (CheckPointerCall(NDecl, TheCall, Proto))
6147 return ExprError();
6148 } else {
6149 if (CheckOtherCall(TheCall, Proto))
6150 return ExprError();
6151 }
6152
6153 return MaybeBindToTemporary(TheCall);
6154 }
6155
6156 ExprResult
6157 Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
6158 SourceLocation RParenLoc, Expr *InitExpr) {
6159 assert(Ty && "ActOnCompoundLiteral(): missing type");
6160 assert(InitExpr && "ActOnCompoundLiteral(): missing expression");
6161
6162 TypeSourceInfo *TInfo;
6163 QualType literalType = GetTypeFromParser(Ty, &TInfo);
6164 if (!TInfo)
6165 TInfo = Context.getTrivialTypeSourceInfo(literalType);
6166
6167 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
6168 }
6169
6170 ExprResult
6171 Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
6172 SourceLocation RParenLoc, Expr *LiteralExpr) {
6173 QualType literalType = TInfo->getType();
6174
6175 if (literalType->isArrayType()) {
6176 if (RequireCompleteType(LParenLoc, Context.getBaseElementType(literalType),
6177 diag::err_illegal_decl_array_incomplete_type,
6178 SourceRange(LParenLoc,
6179 LiteralExpr->getSourceRange().getEnd())))
6180 return ExprError();
6181 if (literalType->isVariableArrayType())
6182 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
6183 << SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd()));
6184 } else if (!literalType->isDependentType() &&
6185 RequireCompleteType(LParenLoc, literalType,
6186 diag::err_typecheck_decl_incomplete_type,
6187 SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd())))
6188 return ExprError();
6189
6190 InitializedEntity Entity
6191 = InitializedEntity::InitializeCompoundLiteralInit(TInfo);
6192 InitializationKind Kind
6193 = InitializationKind::CreateCStyleCast(LParenLoc,
6194 SourceRange(LParenLoc, RParenLoc),
6195 /*InitList=*/true);
6196 InitializationSequence InitSeq(*this, Entity, Kind, LiteralExpr);
6197 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, LiteralExpr,
6198 &literalType);
6199 if (Result.isInvalid())
6200 return ExprError();
6201 LiteralExpr = Result.get();
6202
6203 bool isFileScope = !CurContext->isFunctionOrMethod();
6204
6205 // In C, compound literals are l-values for some reason.
6206 // For GCC compatibility, in C++, file-scope array compound literals with
6207 // constant initializers are also l-values, and compound literals are
6208 // otherwise prvalues.
6209 //
6210 // (GCC also treats C++ list-initialized file-scope array prvalues with
6211 // constant initializers as l-values, but that's non-conforming, so we don't
6212 // follow it there.)
6213 //
6214 // FIXME: It would be better to handle the lvalue cases as materializing and
6215 // lifetime-extending a temporary object, but our materialized temporaries
6216 // representation only supports lifetime extension from a variable, not "out
6217 // of thin air".
6218 // FIXME: For C++, we might want to instead lifetime-extend only if a pointer
6219 // is bound to the result of applying array-to-pointer decay to the compound
6220 // literal.
6221 // FIXME: GCC supports compound literals of reference type, which should
6222 // obviously have a value kind derived from the kind of reference involved.
6223 ExprValueKind VK =
6224 (getLangOpts().CPlusPlus && !(isFileScope && literalType->isArrayType()))
6225 ? VK_RValue
6226 : VK_LValue;
6227
6228 if (isFileScope)
6229 if (auto ILE = dyn_cast<InitListExpr>(LiteralExpr))
6230 for (unsigned i = 0, j = ILE->getNumInits(); i != j; i++) {
6231 Expr *Init = ILE->getInit(i);
6232 ILE->setInit(i, ConstantExpr::Create(Context, Init));
6233 }
6234
6235 auto *E = new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
6236 VK, LiteralExpr, isFileScope);
6237 if (isFileScope) {
6238 if (!LiteralExpr->isTypeDependent() &&
6239 !LiteralExpr->isValueDependent() &&
6240 !literalType->isDependentType()) // C99 6.5.2.5p3
6241 if (CheckForConstantInitializer(LiteralExpr, literalType))
6242 return ExprError();
6243 } else if (literalType.getAddressSpace() != LangAS::opencl_private &&
6244 literalType.getAddressSpace() != LangAS::Default) {
6245 // Embedded-C extensions to C99 6.5.2.5:
6246 // "If the compound literal occurs inside the body of a function, the
6247 // type name shall not be qualified by an address-space qualifier."
6248 Diag(LParenLoc, diag::err_compound_literal_with_address_space)
6249 << SourceRange(LParenLoc, LiteralExpr->getSourceRange().getEnd());
6250 return ExprError();
6251 }
6252
6253 // Compound literals that have automatic storage duration are destroyed at
6254 // the end of the scope. Emit diagnostics if it is or contains a C union type
6255 // that is non-trivial to destruct.
6256 if (!isFileScope)
6257 if (E->getType().hasNonTrivialToPrimitiveDestructCUnion())
6258 checkNonTrivialCUnion(E->getType(), E->getExprLoc(),
6259 NTCUC_CompoundLiteral, NTCUK_Destruct);
6260
6261 if (E->getType().hasNonTrivialToPrimitiveDefaultInitializeCUnion() ||
6262 E->getType().hasNonTrivialToPrimitiveCopyCUnion())
6263 checkNonTrivialCUnionInInitializer(E->getInitializer(),
6264 E->getInitializer()->getExprLoc());
6265
6266 return MaybeBindToTemporary(E);
6267 }
6268
6269 ExprResult
6270 Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList,
6271 SourceLocation RBraceLoc) {
6272 // Only produce each kind of designated initialization diagnostic once.
6273 SourceLocation FirstDesignator;
6274 bool DiagnosedArrayDesignator = false;
6275 bool DiagnosedNestedDesignator = false;
6276 bool DiagnosedMixedDesignator = false;
6277
6278 // Check that any designated initializers are syntactically valid in the
6279 // current language mode.
6280 for (unsigned I = 0, E = InitArgList.size(); I != E; ++I) {
6281 if (auto *DIE = dyn_cast<DesignatedInitExpr>(InitArgList[I])) {
6282 if (FirstDesignator.isInvalid())
6283 FirstDesignator = DIE->getBeginLoc();
6284
6285 if (!getLangOpts().CPlusPlus)
6286 break;
6287
6288 if (!DiagnosedNestedDesignator && DIE->size() > 1) {
6289 DiagnosedNestedDesignator = true;
6290 Diag(DIE->getBeginLoc(), diag::ext_designated_init_nested)
6291 << DIE->getDesignatorsSourceRange();
6292 }
6293
6294 for (auto &Desig : DIE->designators()) {
6295 if (!Desig.isFieldDesignator() && !DiagnosedArrayDesignator) {
6296 DiagnosedArrayDesignator = true;
6297 Diag(Desig.getBeginLoc(), diag::ext_designated_init_array)
6298 << Desig.getSourceRange();
6299 }
6300 }
6301
6302 if (!DiagnosedMixedDesignator &&
6303 !isa<DesignatedInitExpr>(InitArgList[0])) {
6304 DiagnosedMixedDesignator = true;
6305 Diag(DIE->getBeginLoc(), diag::ext_designated_init_mixed)
6306 << DIE->getSourceRange();
6307 Diag(InitArgList[0]->getBeginLoc(), diag::note_designated_init_mixed)
6308 << InitArgList[0]->getSourceRange();
6309 }
6310 } else if (getLangOpts().CPlusPlus && !DiagnosedMixedDesignator &&
6311 isa<DesignatedInitExpr>(InitArgList[0])) {
6312 DiagnosedMixedDesignator = true;
6313 auto *DIE = cast<DesignatedInitExpr>(InitArgList[0]);
6314 Diag(DIE->getBeginLoc(), diag::ext_designated_init_mixed)
6315 << DIE->getSourceRange();
6316 Diag(InitArgList[I]->getBeginLoc(), diag::note_designated_init_mixed)
6317 << InitArgList[I]->getSourceRange();
6318 }
6319 }
6320
6321 if (FirstDesignator.isValid()) {
6322 // Only diagnose designated initiaization as a C++20 extension if we didn't
6323 // already diagnose use of (non-C++20) C99 designator syntax.
6324 if (getLangOpts().CPlusPlus && !DiagnosedArrayDesignator &&
6325 !DiagnosedNestedDesignator && !DiagnosedMixedDesignator) {
6326 Diag(FirstDesignator, getLangOpts().CPlusPlus2a
6327 ? diag::warn_cxx17_compat_designated_init
6328 : diag::ext_cxx_designated_init);
6329 } else if (!getLangOpts().CPlusPlus && !getLangOpts().C99) {
6330 Diag(FirstDesignator, diag::ext_designated_init);
6331 }
6332 }
6333
6334 return BuildInitList(LBraceLoc, InitArgList, RBraceLoc);
6335 }
6336
6337 ExprResult
6338 Sema::BuildInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList,
6339 SourceLocation RBraceLoc) {
6340 // Semantic analysis for initializers is done by ActOnDeclarator() and
6341 // CheckInitializer() - it requires knowledge of the object being initialized.
6342
6343 // Immediately handle non-overload placeholders. Overloads can be
6344 // resolved contextually, but everything else here can't.
6345 for (unsigned I = 0, E = InitArgList.size(); I != E; ++I) {
6346 if (InitArgList[I]->getType()->isNonOverloadPlaceholderType()) {
6347 ExprResult result = CheckPlaceholderExpr(InitArgList[I]);
6348
6349 // Ignore failures; dropping the entire initializer list because
6350 // of one failure would be terrible for indexing/etc.
6351 if (result.isInvalid()) continue;
6352
6353 InitArgList[I] = result.get();
6354 }
6355 }
6356
6357 InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitArgList,
6358 RBraceLoc);
6359 E->setType(Context.VoidTy); // FIXME: just a place holder for now.
6360 return E;
6361 }
6362
6363 /// Do an explicit extend of the given block pointer if we're in ARC.
6364 void Sema::maybeExtendBlockObject(ExprResult &E) {
6365 assert(E.get()->getType()->isBlockPointerType());
6366 assert(E.get()->isRValue());
6367
6368 // Only do this in an r-value context.
6369 if (!getLangOpts().ObjCAutoRefCount) return;
6370
6371 E = ImplicitCastExpr::Create(Context, E.get()->getType(),
6372 CK_ARCExtendBlockObject, E.get(),
6373 /*base path*/ nullptr, VK_RValue);
6374 Cleanup.setExprNeedsCleanups(true);
6375 }
6376
6377 /// Prepare a conversion of the given expression to an ObjC object
6378 /// pointer type.
6379 CastKind Sema::PrepareCastToObjCObjectPointer(ExprResult &E) {
6380 QualType type = E.get()->getType();
6381 if (type->isObjCObjectPointerType()) {
6382 return CK_BitCast;
6383 } else if (type->isBlockPointerType()) {
6384 maybeExtendBlockObject(E);
6385 return CK_BlockPointerToObjCPointerCast;
6386 } else {
6387 assert(type->isPointerType());
6388 return CK_CPointerToObjCPointerCast;
6389 }
6390 }
6391
6392 /// Prepares for a scalar cast, performing all the necessary stages
6393 /// except the final cast and returning the kind required.
6394 CastKind Sema::PrepareScalarCast(ExprResult &Src, QualType DestTy) {
6395 // Both Src and Dest are scalar types, i.e. arithmetic or pointer.
6396 // Also, callers should have filtered out the invalid cases with
6397 // pointers. Everything else should be possible.
6398
6399 QualType SrcTy = Src.get()->getType();
6400 if (Context.hasSameUnqualifiedType(SrcTy, DestTy))
6401 return CK_NoOp;
6402
6403 switch (Type::ScalarTypeKind SrcKind = SrcTy->getScalarTypeKind()) {
6404 case Type::STK_MemberPointer:
6405 llvm_unreachable("member pointer type in C");
6406
6407 case Type::STK_CPointer:
6408 case Type::STK_BlockPointer:
6409 case Type::STK_ObjCObjectPointer:
6410 switch (DestTy->getScalarTypeKind()) {
6411 case Type::STK_CPointer: {
6412 LangAS SrcAS = SrcTy->getPointeeType().getAddressSpace();
6413 LangAS DestAS = DestTy->getPointeeType().getAddressSpace();
6414 if (SrcAS != DestAS)
6415 return CK_AddressSpaceConversion;
6416 if (Context.hasCvrSimilarType(SrcTy, DestTy))
6417 return CK_NoOp;
6418 return CK_BitCast;
6419 }
6420 case Type::STK_BlockPointer:
6421 return (SrcKind == Type::STK_BlockPointer
6422 ? CK_BitCast : CK_AnyPointerToBlockPointerCast);
6423 case Type::STK_ObjCObjectPointer:
6424 if (SrcKind == Type::STK_ObjCObjectPointer)
6425 return CK_BitCast;
6426 if (SrcKind == Type::STK_CPointer)
6427 return CK_CPointerToObjCPointerCast;
6428 maybeExtendBlockObject(Src);
6429 return CK_BlockPointerToObjCPointerCast;
6430 case Type::STK_Bool:
6431 return CK_PointerToBoolean;
6432 case Type::STK_Integral:
6433 return CK_PointerToIntegral;
6434 case Type::STK_Floating:
6435 case Type::STK_FloatingComplex:
6436 case Type::STK_IntegralComplex:
6437 case Type::STK_MemberPointer:
6438 case Type::STK_FixedPoint:
6439 llvm_unreachable("illegal cast from pointer");
6440 }
6441 llvm_unreachable("Should have returned before this");
6442
6443 case Type::STK_FixedPoint:
6444 switch (DestTy->getScalarTypeKind()) {
6445 case Type::STK_FixedPoint:
6446 return CK_FixedPointCast;
6447 case Type::STK_Bool:
6448 return CK_FixedPointToBoolean;
6449 case Type::STK_Integral:
6450 return CK_FixedPointToIntegral;
6451 case Type::STK_Floating:
6452 case Type::STK_IntegralComplex:
6453 case Type::STK_FloatingComplex:
6454 Diag(Src.get()->getExprLoc(),
6455 diag::err_unimplemented_conversion_with_fixed_point_type)
6456 << DestTy;
6457 return CK_IntegralCast;
6458 case Type::STK_CPointer:
6459 case Type::STK_ObjCObjectPointer:
6460 case Type::STK_BlockPointer:
6461 case Type::STK_MemberPointer:
6462 llvm_unreachable("illegal cast to pointer type");
6463 }
6464 llvm_unreachable("Should have returned before this");
6465
6466 case Type::STK_Bool: // casting from bool is like casting from an integer
6467 case Type::STK_Integral:
6468 switch (DestTy->getScalarTypeKind()) {
6469 case Type::STK_CPointer:
6470 case Type::STK_ObjCObjectPointer:
6471 case Type::STK_BlockPointer:
6472 if (Src.get()->isNullPointerConstant(Context,
6473 Expr::NPC_ValueDependentIsNull))
6474 return CK_NullToPointer;
6475 return CK_IntegralToPointer;
6476 case Type::STK_Bool:
6477 return CK_IntegralToBoolean;
6478 case Type::STK_Integral:
6479 return CK_IntegralCast;
6480 case Type::STK_Floating:
6481 return CK_IntegralToFloating;
6482 case Type::STK_IntegralComplex:
6483 Src = ImpCastExprToType(Src.get(),
6484 DestTy->castAs<ComplexType>()->getElementType(),
6485 CK_IntegralCast);
6486 return CK_IntegralRealToComplex;
6487 case Type::STK_FloatingComplex:
6488 Src = ImpCastExprToType(Src.get(),
6489 DestTy->castAs<ComplexType>()->getElementType(),
6490 CK_IntegralToFloating);
6491 return CK_FloatingRealToComplex;
6492 case Type::STK_MemberPointer:
6493 llvm_unreachable("member pointer type in C");
6494 case Type::STK_FixedPoint:
6495 return CK_IntegralToFixedPoint;
6496 }
6497 llvm_unreachable("Should have returned before this");
6498
6499 case Type::STK_Floating:
6500 switch (DestTy->getScalarTypeKind()) {
6501 case Type::STK_Floating:
6502 return CK_FloatingCast;
6503 case Type::STK_Bool:
6504 return CK_FloatingToBoolean;
6505 case Type::STK_Integral:
6506 return CK_FloatingToIntegral;
6507 case Type::STK_FloatingComplex:
6508 Src = ImpCastExprToType(Src.get(),
6509 DestTy->castAs<ComplexType>()->getElementType(),
6510 CK_FloatingCast);
6511 return CK_FloatingRealToComplex;
6512 case Type::STK_IntegralComplex:
6513 Src = ImpCastExprToType(Src.get(),
6514 DestTy->castAs<ComplexType>()->getElementType(),
6515 CK_FloatingToIntegral);
6516 return CK_IntegralRealToComplex;
6517 case Type::STK_CPointer:
6518 case Type::STK_ObjCObjectPointer:
6519 case Type::STK_BlockPointer:
6520 llvm_unreachable("valid float->pointer cast?");
6521 case Type::STK_MemberPointer:
6522 llvm_unreachable("member pointer type in C");
6523 case Type::STK_FixedPoint:
6524 Diag(Src.get()->getExprLoc(),
6525 diag::err_unimplemented_conversion_with_fixed_point_type)
6526 << SrcTy;
6527 return CK_IntegralCast;
6528 }
6529 llvm_unreachable("Should have returned before this");
6530
6531 case Type::STK_FloatingComplex:
6532 switch (DestTy->getScalarTypeKind()) {
6533 case Type::STK_FloatingComplex:
6534 return CK_FloatingComplexCast;
6535 case Type::STK_IntegralComplex:
6536 return CK_FloatingComplexToIntegralComplex;
6537 case Type::STK_Floating: {
6538 QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
6539 if (Context.hasSameType(ET, DestTy))
6540 return CK_FloatingComplexToReal;
6541 Src = ImpCastExprToType(Src.get(), ET, CK_FloatingComplexToReal);
6542 return CK_FloatingCast;
6543 }
6544 case Type::STK_Bool:
6545 return CK_FloatingComplexToBoolean;
6546 case Type::STK_Integral:
6547 Src = ImpCastExprToType(Src.get(),
6548 SrcTy->castAs<ComplexType>()->getElementType(),
6549 CK_FloatingComplexToReal);
6550 return CK_FloatingToIntegral;
6551 case Type::STK_CPointer:
6552 case Type::STK_ObjCObjectPointer:
6553 case Type::STK_BlockPointer:
6554 llvm_unreachable("valid complex float->pointer cast?");
6555 case Type::STK_MemberPointer:
6556 llvm_unreachable("member pointer type in C");
6557 case Type::STK_FixedPoint:
6558 Diag(Src.get()->getExprLoc(),
6559 diag::err_unimplemented_conversion_with_fixed_point_type)
6560 << SrcTy;
6561 return CK_IntegralCast;
6562 }
6563 llvm_unreachable("Should have returned before this");
6564
6565 case Type::STK_IntegralComplex:
6566 switch (DestTy->getScalarTypeKind()) {
6567 case Type::STK_FloatingComplex:
6568 return CK_IntegralComplexToFloatingComplex;
6569 case Type::STK_IntegralComplex:
6570 return CK_IntegralComplexCast;
6571 case Type::STK_Integral: {
6572 QualType ET = SrcTy->castAs<ComplexType>()->getElementType();
6573 if (Context.hasSameType(ET, DestTy))
6574 return CK_IntegralComplexToReal;
6575 Src = ImpCastExprToType(Src.get(), ET, CK_IntegralComplexToReal);
6576 return CK_IntegralCast;
6577 }
6578 case Type::STK_Bool:
6579 return CK_IntegralComplexToBoolean;
6580 case Type::STK_Floating:
6581 Src = ImpCastExprToType(Src.get(),
6582 SrcTy->castAs<ComplexType>()->getElementType(),
6583 CK_IntegralComplexToReal);
6584 return CK_IntegralToFloating;
6585 case Type::STK_CPointer:
6586 case Type::STK_ObjCObjectPointer:
6587 case Type::STK_BlockPointer:
6588 llvm_unreachable("valid complex int->pointer cast?");
6589 case Type::STK_MemberPointer:
6590 llvm_unreachable("member pointer type in C");
6591 case Type::STK_FixedPoint:
6592 Diag(Src.get()->getExprLoc(),
6593 diag::err_unimplemented_conversion_with_fixed_point_type)
6594 << SrcTy;
6595 return CK_IntegralCast;
6596 }
6597 llvm_unreachable("Should have returned before this");
6598 }
6599
6600 llvm_unreachable("Unhandled scalar cast");
6601 }
6602
6603 static bool breakDownVectorType(QualType type, uint64_t &len,
6604 QualType &eltType) {
6605 // Vectors are simple.
6606 if (const VectorType *vecType = type->getAs<VectorType>()) {
6607 len = vecType->getNumElements();
6608 eltType = vecType->getElementType();
6609 assert(eltType->isScalarType());
6610 return true;
6611 }
6612
6613 // We allow lax conversion to and from non-vector types, but only if
6614 // they're real types (i.e. non-complex, non-pointer scalar types).
6615 if (!type->isRealType()) return false;
6616
6617 len = 1;
6618 eltType = type;
6619 return true;
6620 }
6621
6622 /// Are the two types lax-compatible vector types? That is, given
6623 /// that one of them is a vector, do they have equal storage sizes,
6624 /// where the storage size is the number of elements times the element
6625 /// size?
6626 ///
6627 /// This will also return false if either of the types is neither a
6628 /// vector nor a real type.
6629 bool Sema::areLaxCompatibleVectorTypes(QualType srcTy, QualType destTy) {
6630 assert(destTy->isVectorType() || srcTy->isVectorType());
6631
6632 // Disallow lax conversions between scalars and ExtVectors (these
6633 // conversions are allowed for other vector types because common headers
6634 // depend on them). Most scalar OP ExtVector cases are handled by the
6635 // splat path anyway, which does what we want (convert, not bitcast).
6636 // What this rules out for ExtVectors is crazy things like char4*float.
6637 if (srcTy->isScalarType() && destTy->isExtVectorType()) return false;
6638 if (destTy->isScalarType() && srcTy->isExtVectorType()) return false;
6639
6640 uint64_t srcLen, destLen;
6641 QualType srcEltTy, destEltTy;
6642 if (!breakDownVectorType(srcTy, srcLen, srcEltTy)) return false;
6643 if (!breakDownVectorType(destTy, destLen, destEltTy)) return false;
6644
6645 // ASTContext::getTypeSize will return the size rounded up to a
6646 // power of 2, so instead of using that, we need to use the raw
6647 // element size multiplied by the element count.
6648 uint64_t srcEltSize = Context.getTypeSize(srcEltTy);
6649 uint64_t destEltSize = Context.getTypeSize(destEltTy);
6650
6651 return (srcLen * srcEltSize == destLen * destEltSize);
6652 }
6653
6654 /// Is this a legal conversion between two types, one of which is
6655 /// known to be a vector type?
6656 bool Sema::isLaxVectorConversion(QualType srcTy, QualType destTy) {
6657 assert(destTy->isVectorType() || srcTy->isVectorType());
6658
6659 switch (Context.getLangOpts().getLaxVectorConversions()) {
6660 case LangOptions::LaxVectorConversionKind::None:
6661 return false;
6662
6663 case LangOptions::LaxVectorConversionKind::Integer:
6664 if (!srcTy->isIntegralOrEnumerationType()) {
6665 auto *Vec = srcTy->getAs<VectorType>();
6666 if (!Vec || !Vec->getElementType()->isIntegralOrEnumerationType())
6667 return false;
6668 }
6669 if (!destTy->isIntegralOrEnumerationType()) {
6670 auto *Vec = destTy->getAs<VectorType>();
6671 if (!Vec || !Vec->getElementType()->isIntegralOrEnumerationType())
6672 return false;
6673 }
6674 // OK, integer (vector) -> integer (vector) bitcast.
6675 break;
6676
6677 case LangOptions::LaxVectorConversionKind::All:
6678 break;
6679 }
6680
6681 return areLaxCompatibleVectorTypes(srcTy, destTy);
6682 }
6683
6684 bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
6685 CastKind &Kind) {
6686 assert(VectorTy->isVectorType() && "Not a vector type!");
6687
6688 if (Ty->isVectorType() || Ty->isIntegralType(Context)) {
6689 if (!areLaxCompatibleVectorTypes(Ty, VectorTy))
6690 return Diag(R.getBegin(),
6691 Ty->isVectorType() ?
6692 diag::err_invalid_conversion_between_vectors :
6693 diag::err_invalid_conversion_between_vector_and_integer)
6694 << VectorTy << Ty << R;
6695 } else
6696 return Diag(R.getBegin(),
6697 diag::err_invalid_conversion_between_vector_and_scalar)
6698 << VectorTy << Ty << R;
6699
6700 Kind = CK_BitCast;
6701 return false;
6702 }
6703
6704 ExprResult Sema::prepareVectorSplat(QualType VectorTy, Expr *SplattedExpr) {
6705 QualType DestElemTy = VectorTy->castAs<VectorType>()->getElementType();
6706
6707 if (DestElemTy == SplattedExpr->getType())
6708 return SplattedExpr;
6709
6710 assert(DestElemTy->isFloatingType() ||
6711 DestElemTy->isIntegralOrEnumerationType());
6712
6713 CastKind CK;
6714 if (VectorTy->isExtVectorType() && SplattedExpr->getType()->isBooleanType()) {
6715 // OpenCL requires that we convert `true` boolean expressions to -1, but
6716 // only when splatting vectors.
6717 if (DestElemTy->isFloatingType()) {
6718 // To avoid having to have a CK_BooleanToSignedFloating cast kind, we cast
6719 // in two steps: boolean to signed integral, then to floating.
6720 ExprResult CastExprRes = ImpCastExprToType(SplattedExpr, Context.IntTy,
6721 CK_BooleanToSignedIntegral);
6722 SplattedExpr = CastExprRes.get();
6723 CK = CK_IntegralToFloating;
6724 } else {
6725 CK = CK_BooleanToSignedIntegral;
6726 }
6727 } else {
6728 ExprResult CastExprRes = SplattedExpr;
6729 CK = PrepareScalarCast(CastExprRes, DestElemTy);
6730 if (CastExprRes.isInvalid())
6731 return ExprError();
6732 SplattedExpr = CastExprRes.get();
6733 }
6734 return ImpCastExprToType(SplattedExpr, DestElemTy, CK);
6735 }
6736
6737 ExprResult Sema::CheckExtVectorCast(SourceRange R, QualType DestTy,
6738 Expr *CastExpr, CastKind &Kind) {
6739 assert(DestTy->isExtVectorType() && "Not an extended vector type!");
6740
6741 QualType SrcTy = CastExpr->getType();
6742
6743 // If SrcTy is a VectorType, the total size must match to explicitly cast to
6744 // an ExtVectorType.
6745 // In OpenCL, casts between vectors of different types are not allowed.
6746 // (See OpenCL 6.2).
6747 if (SrcTy->isVectorType()) {
6748 if (!areLaxCompatibleVectorTypes(SrcTy, DestTy) ||
6749 (getLangOpts().OpenCL &&
6750 !Context.hasSameUnqualifiedType(DestTy, SrcTy))) {
6751 Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
6752 << DestTy << SrcTy << R;
6753 return ExprError();
6754 }
6755 Kind = CK_BitCast;
6756 return CastExpr;
6757 }
6758
6759 // All non-pointer scalars can be cast to ExtVector type. The appropriate
6760 // conversion will take place first from scalar to elt type, and then
6761 // splat from elt type to vector.
6762 if (SrcTy->isPointerType())
6763 return Diag(R.getBegin(),
6764 diag::err_invalid_conversion_between_vector_and_scalar)
6765 << DestTy << SrcTy << R;
6766
6767 Kind = CK_VectorSplat;
6768 return prepareVectorSplat(DestTy, CastExpr);
6769 }
6770
6771 ExprResult
6772 Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc,
6773 Declarator &D, ParsedType &Ty,
6774 SourceLocation RParenLoc, Expr *CastExpr) {
6775 assert(!D.isInvalidType() && (CastExpr != nullptr) &&
6776 "ActOnCastExpr(): missing type or expr");
6777
6778 TypeSourceInfo *castTInfo = GetTypeForDeclaratorCast(D, CastExpr->getType());
6779 if (D.isInvalidType())
6780 return ExprError();
6781
6782 if (getLangOpts().CPlusPlus) {
6783 // Check that there are no default arguments (C++ only).
6784 CheckExtraCXXDefaultArguments(D);
6785 } else {
6786 // Make sure any TypoExprs have been dealt with.
6787 ExprResult Res = CorrectDelayedTyposInExpr(CastExpr);
6788 if (!Res.isUsable())
6789 return ExprError();
6790 CastExpr = Res.get();
6791 }
6792
6793 checkUnusedDeclAttributes(D);
6794
6795 QualType castType = castTInfo->getType();
6796 Ty = CreateParsedType(castType, castTInfo);
6797
6798 bool isVectorLiteral = false;
6799
6800 // Check for an altivec or OpenCL literal,
6801 // i.e. all the elements are integer constants.
6802 ParenExpr *PE = dyn_cast<ParenExpr>(CastExpr);
6803 ParenListExpr *PLE = dyn_cast<ParenListExpr>(CastExpr);
6804 if ((getLangOpts().AltiVec || getLangOpts().ZVector || getLangOpts().OpenCL)
6805 && castType->isVectorType() && (PE || PLE)) {
6806 if (PLE && PLE->getNumExprs() == 0) {
6807 Diag(PLE->getExprLoc(), diag::err_altivec_empty_initializer);
6808 return ExprError();
6809 }
6810 if (PE || PLE->getNumExprs() == 1) {
6811 Expr *E = (PE ? PE->getSubExpr() : PLE->getExpr(0));
6812 if (!E->getType()->isVectorType())
6813 isVectorLiteral = true;
6814 }
6815 else
6816 isVectorLiteral = true;
6817 }
6818
6819 // If this is a vector initializer, '(' type ')' '(' init, ..., init ')'
6820 // then handle it as such.
6821 if (isVectorLiteral)
6822 return BuildVectorLiteral(LParenLoc, RParenLoc, CastExpr, castTInfo);
6823
6824 // If the Expr being casted is a ParenListExpr, handle it specially.
6825 // This is not an AltiVec-style cast, so turn the ParenListExpr into a
6826 // sequence of BinOp comma operators.
6827 if (isa<ParenListExpr>(CastExpr)) {
6828 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, CastExpr);
6829 if (Result.isInvalid()) return ExprError();
6830 CastExpr = Result.get();
6831 }
6832
6833 if (getLangOpts().CPlusPlus && !castType->isVoidType() &&
6834 !getSourceManager().isInSystemMacro(LParenLoc))
6835 Diag(LParenLoc, diag::warn_old_style_cast) << CastExpr->getSourceRange();
6836
6837 CheckTollFreeBridgeCast(castType, CastExpr);
6838
6839 CheckObjCBridgeRelatedCast(castType, CastExpr);
6840
6841 DiscardMisalignedMemberAddress(castType.getTypePtr(), CastExpr);
6842
6843 return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, CastExpr);
6844 }
6845
6846 ExprResult Sema::BuildVectorLiteral(SourceLocation LParenLoc,
6847 SourceLocation RParenLoc, Expr *E,
6848 TypeSourceInfo *TInfo) {
6849 assert((isa<ParenListExpr>(E) || isa<ParenExpr>(E)) &&
6850 "Expected paren or paren list expression");
6851
6852 Expr **exprs;
6853 unsigned numExprs;
6854 Expr *subExpr;
6855 SourceLocation LiteralLParenLoc, LiteralRParenLoc;
6856 if (ParenListExpr *PE = dyn_cast<ParenListExpr>(E)) {
6857 LiteralLParenLoc = PE->getLParenLoc();
6858 LiteralRParenLoc = PE->getRParenLoc();
6859 exprs = PE->getExprs();
6860 numExprs = PE->getNumExprs();
6861 } else { // isa<ParenExpr> by assertion at function entrance
6862 LiteralLParenLoc = cast<ParenExpr>(E)->getLParen();
6863 LiteralRParenLoc = cast<ParenExpr>(E)->getRParen();
6864 subExpr = cast<ParenExpr>(E)->getSubExpr();
6865 exprs = &subExpr;
6866 numExprs = 1;
6867 }
6868
6869 QualType Ty = TInfo->getType();
6870 assert(Ty->isVectorType() && "Expected vector type");
6871
6872 SmallVector<Expr *, 8> initExprs;
6873 const VectorType *VTy = Ty->castAs<VectorType>();
6874 unsigned numElems = VTy->getNumElements();
6875
6876 // '(...)' form of vector initialization in AltiVec: the number of
6877 // initializers must be one or must match the size of the vector.
6878 // If a single value is specified in the initializer then it will be
6879 // replicated to all the components of the vector
6880 if (VTy->getVectorKind() == VectorType::AltiVecVector) {
6881 // The number of initializers must be one or must match the size of the
6882 // vector. If a single value is specified in the initializer then it will
6883 // be replicated to all the components of the vector
6884 if (numExprs == 1) {
6885 QualType ElemTy = VTy->getElementType();
6886 ExprResult Literal = DefaultLvalueConversion(exprs[0]);
6887 if (Literal.isInvalid())
6888 return ExprError();
6889 Literal = ImpCastExprToType(Literal.get(), ElemTy,
6890 PrepareScalarCast(Literal, ElemTy));
6891 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.get());
6892 }
6893 else if (numExprs < numElems) {
6894 Diag(E->getExprLoc(),
6895 diag::err_incorrect_number_of_vector_initializers);
6896 return ExprError();
6897 }
6898 else
6899 initExprs.append(exprs, exprs + numExprs);
6900 }
6901 else {
6902 // For OpenCL, when the number of initializers is a single value,
6903 // it will be replicated to all components of the vector.
6904 if (getLangOpts().OpenCL &&
6905 VTy->getVectorKind() == VectorType::GenericVector &&
6906 numExprs == 1) {
6907 QualType ElemTy = VTy->getElementType();
6908 ExprResult Literal = DefaultLvalueConversion(exprs[0]);
6909 if (Literal.isInvalid())
6910 return ExprError();
6911 Literal = ImpCastExprToType(Literal.get(), ElemTy,
6912 PrepareScalarCast(Literal, ElemTy));
6913 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Literal.get());
6914 }
6915
6916 initExprs.append(exprs, exprs + numExprs);
6917 }
6918 // FIXME: This means that pretty-printing the final AST will produce curly
6919 // braces instead of the original commas.
6920 InitListExpr *initE = new (Context) InitListExpr(Context, LiteralLParenLoc,
6921 initExprs, LiteralRParenLoc);
6922 initE->setType(Ty);
6923 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, initE);
6924 }
6925
6926 /// This is not an AltiVec-style cast or or C++ direct-initialization, so turn
6927 /// the ParenListExpr into a sequence of comma binary operators.
6928 ExprResult
6929 Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *OrigExpr) {
6930 ParenListExpr *E = dyn_cast<ParenListExpr>(OrigExpr);
6931 if (!E)
6932 return OrigExpr;
6933
6934 ExprResult Result(E->getExpr(0));
6935
6936 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
6937 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
6938 E->getExpr(i));
6939
6940 if (Result.isInvalid()) return ExprError();
6941
6942 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
6943 }
6944
6945 ExprResult Sema::ActOnParenListExpr(SourceLocation L,
6946 SourceLocation R,
6947 MultiExprArg Val) {
6948 return ParenListExpr::Create(Context, L, Val, R);
6949 }
6950
6951 /// Emit a specialized diagnostic when one expression is a null pointer
6952 /// constant and the other is not a pointer. Returns true if a diagnostic is
6953 /// emitted.
6954 bool Sema::DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr,
6955 SourceLocation QuestionLoc) {
6956 Expr *NullExpr = LHSExpr;
6957 Expr *NonPointerExpr = RHSExpr;
6958 Expr::NullPointerConstantKind NullKind =
6959 NullExpr->isNullPointerConstant(Context,
6960 Expr::NPC_ValueDependentIsNotNull);
6961
6962 if (NullKind == Expr::NPCK_NotNull) {
6963 NullExpr = RHSExpr;
6964 NonPointerExpr = LHSExpr;
6965 NullKind =
6966 NullExpr->isNullPointerConstant(Context,
6967 Expr::NPC_ValueDependentIsNotNull);
6968 }
6969
6970 if (NullKind == Expr::NPCK_NotNull)
6971 return false;
6972
6973 if (NullKind == Expr::NPCK_ZeroExpression)
6974 return false;
6975
6976 if (NullKind == Expr::NPCK_ZeroLiteral) {
6977 // In this case, check to make sure that we got here from a "NULL"
6978 // string in the source code.
6979 NullExpr = NullExpr->IgnoreParenImpCasts();
6980 SourceLocation loc = NullExpr->getExprLoc();
6981 if (!findMacroSpelling(loc, "NULL"))
6982 return false;
6983 }
6984
6985 int DiagType = (NullKind == Expr::NPCK_CXX11_nullptr);
6986 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands_null)
6987 << NonPointerExpr->getType() << DiagType
6988 << NonPointerExpr->getSourceRange();
6989 return true;
6990 }
6991
6992 /// Return false if the condition expression is valid, true otherwise.
6993 static bool checkCondition(Sema &S, Expr *Cond, SourceLocation QuestionLoc) {
6994 QualType CondTy = Cond->getType();
6995
6996 // OpenCL v1.1 s6.3.i says the condition cannot be a floating point type.
6997 if (S.getLangOpts().OpenCL && CondTy->isFloatingType()) {
6998 S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_nonfloat)
6999 << CondTy << Cond->getSourceRange();
7000 return true;
7001 }
7002
7003 // C99 6.5.15p2
7004 if (CondTy->isScalarType()) return false;
7005
7006 S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_scalar)
7007 << CondTy << Cond->getSourceRange();
7008 return true;
7009 }
7010
7011 /// Handle when one or both operands are void type.
7012 static QualType checkConditionalVoidType(Sema &S, ExprResult &LHS,
7013 ExprResult &RHS) {
7014 Expr *LHSExpr = LHS.get();
7015 Expr *RHSExpr = RHS.get();
7016
7017 if (!LHSExpr->getType()->isVoidType())
7018 S.Diag(RHSExpr->getBeginLoc(), diag::ext_typecheck_cond_one_void)
7019 << RHSExpr->getSourceRange();
7020 if (!RHSExpr->getType()->isVoidType())
7021 S.Diag(LHSExpr->getBeginLoc(), diag::ext_typecheck_cond_one_void)
7022 << LHSExpr->getSourceRange();
7023 LHS = S.ImpCastExprToType(LHS.get(), S.Context.VoidTy, CK_ToVoid);
7024 RHS = S.ImpCastExprToType(RHS.get(), S.Context.VoidTy, CK_ToVoid);
7025 return S.Context.VoidTy;
7026 }
7027
7028 /// Return false if the NullExpr can be promoted to PointerTy,
7029 /// true otherwise.
7030 static bool checkConditionalNullPointer(Sema &S, ExprResult &NullExpr,
7031 QualType PointerTy) {
7032 if ((!PointerTy->isAnyPointerType() && !PointerTy->isBlockPointerType()) ||
7033 !NullExpr.get()->isNullPointerConstant(S.Context,
7034 Expr::NPC_ValueDependentIsNull))
7035 return true;
7036
7037 NullExpr = S.ImpCastExprToType(NullExpr.get(), PointerTy, CK_NullToPointer);
7038 return false;
7039 }
7040
7041 /// Checks compatibility between two pointers and return the resulting
7042 /// type.
7043 static QualType checkConditionalPointerCompatibility(Sema &S, ExprResult &LHS,
7044 ExprResult &RHS,
7045 SourceLocation Loc) {
7046 QualType LHSTy = LHS.get()->getType();
7047 QualType RHSTy = RHS.get()->getType();
7048
7049 if (S.Context.hasSameType(LHSTy, RHSTy)) {
7050 // Two identical pointers types are always compatible.
7051 return LHSTy;
7052 }
7053
7054 QualType lhptee, rhptee;
7055
7056 // Get the pointee types.
7057 bool IsBlockPointer = false;
7058 if (const BlockPointerType *LHSBTy = LHSTy->getAs<BlockPointerType>()) {
7059 lhptee = LHSBTy->getPointeeType();
7060 rhptee = RHSTy->castAs<BlockPointerType>()->getPointeeType();
7061 IsBlockPointer = true;
7062 } else {
7063 lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
7064 rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
7065 }
7066
7067 // C99 6.5.15p6: If both operands are pointers to compatible types or to
7068 // differently qualified versions of compatible types, the result type is
7069 // a pointer to an appropriately qualified version of the composite
7070 // type.
7071
7072 // Only CVR-qualifiers exist in the standard, and the differently-qualified
7073 // clause doesn't make sense for our extensions. E.g. address space 2 should
7074 // be incompatible with address space 3: they may live on different devices or
7075 // anything.
7076 Qualifiers lhQual = lhptee.getQualifiers();
7077 Qualifiers rhQual = rhptee.getQualifiers();
7078
7079 LangAS ResultAddrSpace = LangAS::Default;
7080 LangAS LAddrSpace = lhQual.getAddressSpace();
7081 LangAS RAddrSpace = rhQual.getAddressSpace();
7082
7083 // OpenCL v1.1 s6.5 - Conversion between pointers to distinct address
7084 // spaces is disallowed.
7085 if (lhQual.isAddressSpaceSupersetOf(rhQual))
7086 ResultAddrSpace = LAddrSpace;
7087 else if (rhQual.isAddressSpaceSupersetOf(lhQual))
7088 ResultAddrSpace = RAddrSpace;
7089 else {
7090 S.Diag(Loc, diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
7091 << LHSTy << RHSTy << 2 << LHS.get()->getSourceRange()
7092 << RHS.get()->getSourceRange();
7093 return QualType();
7094 }
7095
7096 unsigned MergedCVRQual = lhQual.getCVRQualifiers() | rhQual.getCVRQualifiers();
7097 auto LHSCastKind = CK_BitCast, RHSCastKind = CK_BitCast;
7098 lhQual.removeCVRQualifiers();
7099 rhQual.removeCVRQualifiers();
7100
7101 // OpenCL v2.0 specification doesn't extend compatibility of type qualifiers
7102 // (C99 6.7.3) for address spaces. We assume that the check should behave in
7103 // the same manner as it's defined for CVR qualifiers, so for OpenCL two
7104 // qual types are compatible iff
7105 // * corresponded types are compatible
7106 // * CVR qualifiers are equal
7107 // * address spaces are equal
7108 // Thus for conditional operator we merge CVR and address space unqualified
7109 // pointees and if there is a composite type we return a pointer to it with
7110 // merged qualifiers.
7111 LHSCastKind =
7112 LAddrSpace == ResultAddrSpace ? CK_BitCast : CK_AddressSpaceConversion;
7113 RHSCastKind =
7114 RAddrSpace == ResultAddrSpace ? CK_BitCast : CK_AddressSpaceConversion;
7115 lhQual.removeAddressSpace();
7116 rhQual.removeAddressSpace();
7117
7118 lhptee = S.Context.getQualifiedType(lhptee.getUnqualifiedType(), lhQual);
7119 rhptee = S.Context.getQualifiedType(rhptee.getUnqualifiedType(), rhQual);
7120
7121 QualType CompositeTy = S.Context.mergeTypes(lhptee, rhptee);
7122
7123 if (CompositeTy.isNull()) {
7124 // In this situation, we assume void* type. No especially good
7125 // reason, but this is what gcc does, and we do have to pick
7126 // to get a consistent AST.
7127 QualType incompatTy;
7128 incompatTy = S.Context.getPointerType(
7129 S.Context.getAddrSpaceQualType(S.Context.VoidTy, ResultAddrSpace));
7130 LHS = S.ImpCastExprToType(LHS.get(), incompatTy, LHSCastKind);
7131 RHS = S.ImpCastExprToType(RHS.get(), incompatTy, RHSCastKind);
7132
7133 // FIXME: For OpenCL the warning emission and cast to void* leaves a room
7134 // for casts between types with incompatible address space qualifiers.
7135 // For the following code the compiler produces casts between global and
7136 // local address spaces of the corresponded innermost pointees:
7137 // local int *global *a;
7138 // global int *global *b;
7139 // a = (0 ? a : b); // see C99 6.5.16.1.p1.
7140 S.Diag(Loc, diag::ext_typecheck_cond_incompatible_pointers)
7141 << LHSTy << RHSTy << LHS.get()->getSourceRange()
7142 << RHS.get()->getSourceRange();
7143
7144 return incompatTy;
7145 }
7146
7147 // The pointer types are compatible.
7148 // In case of OpenCL ResultTy should have the address space qualifier
7149 // which is a superset of address spaces of both the 2nd and the 3rd
7150 // operands of the conditional operator.
7151 QualType ResultTy = [&, ResultAddrSpace]() {
7152 if (S.getLangOpts().OpenCL) {
7153 Qualifiers CompositeQuals = CompositeTy.getQualifiers();
7154 CompositeQuals.setAddressSpace(ResultAddrSpace);
7155 return S.Context
7156 .getQualifiedType(CompositeTy.getUnqualifiedType(), CompositeQuals)
7157 .withCVRQualifiers(MergedCVRQual);
7158 }
7159 return CompositeTy.withCVRQualifiers(MergedCVRQual);
7160 }();
7161 if (IsBlockPointer)
7162 ResultTy = S.Context.getBlockPointerType(ResultTy);
7163 else
7164 ResultTy = S.Context.getPointerType(ResultTy);
7165
7166 LHS = S.ImpCastExprToType(LHS.get(), ResultTy, LHSCastKind);
7167 RHS = S.ImpCastExprToType(RHS.get(), ResultTy, RHSCastKind);
7168 return ResultTy;
7169 }
7170
7171 /// Return the resulting type when the operands are both block pointers.
7172 static QualType checkConditionalBlockPointerCompatibility(Sema &S,
7173 ExprResult &LHS,
7174 ExprResult &RHS,
7175 SourceLocation Loc) {
7176 QualType LHSTy = LHS.get()->getType();
7177 QualType RHSTy = RHS.get()->getType();
7178
7179 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
7180 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
7181 QualType destType = S.Context.getPointerType(S.Context.VoidTy);
7182 LHS = S.ImpCastExprToType(LHS.get(), destType, CK_BitCast);
7183 RHS = S.ImpCastExprToType(RHS.get(), destType, CK_BitCast);
7184 return destType;
7185 }
7186 S.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
7187 << LHSTy << RHSTy << LHS.get()->getSourceRange()
7188 << RHS.get()->getSourceRange();
7189 return QualType();
7190 }
7191
7192 // We have 2 block pointer types.
7193 return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
7194 }
7195
7196 /// Return the resulting type when the operands are both pointers.
7197 static QualType
7198 checkConditionalObjectPointersCompatibility(Sema &S, ExprResult &LHS,
7199 ExprResult &RHS,
7200 SourceLocation Loc) {
7201 // get the pointer types
7202 QualType LHSTy = LHS.get()->getType();
7203 QualType RHSTy = RHS.get()->getType();
7204
7205 // get the "pointed to" types
7206 QualType lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
7207 QualType rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
7208
7209 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
7210 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
7211 // Figure out necessary qualifiers (C99 6.5.15p6)
7212 QualType destPointee
7213 = S.Context.getQualifiedType(lhptee, rhptee.getQualifiers());
7214 QualType destType = S.Context.getPointerType(destPointee);
7215 // Add qualifiers if necessary.
7216 LHS = S.ImpCastExprToType(LHS.get(), destType, CK_NoOp);
7217 // Promote to void*.
7218 RHS = S.ImpCastExprToType(RHS.get(), destType, CK_BitCast);
7219 return destType;
7220 }
7221 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
7222 QualType destPointee
7223 = S.Context.getQualifiedType(rhptee, lhptee.getQualifiers());
7224 QualType destType = S.Context.getPointerType(destPointee);
7225 // Add qualifiers if necessary.
7226 RHS = S.ImpCastExprToType(RHS.get(), destType, CK_NoOp);
7227 // Promote to void*.
7228 LHS = S.ImpCastExprToType(LHS.get(), destType, CK_BitCast);
7229 return destType;
7230 }
7231
7232 return checkConditionalPointerCompatibility(S, LHS, RHS, Loc);
7233 }
7234
7235 /// Return false if the first expression is not an integer and the second
7236 /// expression is not a pointer, true otherwise.
7237 static bool checkPointerIntegerMismatch(Sema &S, ExprResult &Int,
7238 Expr* PointerExpr, SourceLocation Loc,
7239 bool IsIntFirstExpr) {
7240 if (!PointerExpr->getType()->isPointerType() ||
7241 !Int.get()->getType()->isIntegerType())
7242 return false;
7243
7244 Expr *Expr1 = IsIntFirstExpr ? Int.get() : PointerExpr;
7245 Expr *Expr2 = IsIntFirstExpr ? PointerExpr : Int.get();
7246
7247 S.Diag(Loc, diag::ext_typecheck_cond_pointer_integer_mismatch)
7248 << Expr1->getType() << Expr2->getType()
7249 << Expr1->getSourceRange() << Expr2->getSourceRange();
7250 Int = S.ImpCastExprToType(Int.get(), PointerExpr->getType(),
7251 CK_IntegralToPointer);
7252 return true;
7253 }
7254
7255 /// Simple conversion between integer and floating point types.
7256 ///
7257 /// Used when handling the OpenCL conditional operator where the
7258 /// condition is a vector while the other operands are scalar.
7259 ///
7260 /// OpenCL v1.1 s6.3.i and s6.11.6 together require that the scalar
7261 /// types are either integer or floating type. Between the two
7262 /// operands, the type with the higher rank is defined as the "result
7263 /// type". The other operand needs to be promoted to the same type. No
7264 /// other type promotion is allowed. We cannot use
7265 /// UsualArithmeticConversions() for this purpose, since it always
7266 /// promotes promotable types.
7267 static QualType OpenCLArithmeticConversions(Sema &S, ExprResult &LHS,
7268 ExprResult &RHS,
7269 SourceLocation QuestionLoc) {
7270 LHS = S.DefaultFunctionArrayLvalueConversion(LHS.get());
7271 if (LHS.isInvalid())
7272 return QualType();
7273 RHS = S.DefaultFunctionArrayLvalueConversion(RHS.get());
7274 if (RHS.isInvalid())
7275 return QualType();
7276
7277 // For conversion purposes, we ignore any qualifiers.
7278 // For example, "const float" and "float" are equivalent.
7279 QualType LHSType =
7280 S.Context.getCanonicalType(LHS.get()->getType()).getUnqualifiedType();
7281 QualType RHSType =
7282 S.Context.getCanonicalType(RHS.get()->getType()).getUnqualifiedType();
7283
7284 if (!LHSType->isIntegerType() && !LHSType->isRealFloatingType()) {
7285 S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_int_float)
7286 << LHSType << LHS.get()->getSourceRange();
7287 return QualType();
7288 }
7289
7290 if (!RHSType->isIntegerType() && !RHSType->isRealFloatingType()) {
7291 S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_int_float)
7292 << RHSType << RHS.get()->getSourceRange();
7293 return QualType();
7294 }
7295
7296 // If both types are identical, no conversion is needed.
7297 if (LHSType == RHSType)
7298 return LHSType;
7299
7300 // Now handle "real" floating types (i.e. float, double, long double).
7301 if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType())
7302 return handleFloatConversion(S, LHS, RHS, LHSType, RHSType,
7303 /*IsCompAssign = */ false);
7304
7305 // Finally, we have two differing integer types.
7306 return handleIntegerConversion<doIntegralCast, doIntegralCast>
7307 (S, LHS, RHS, LHSType, RHSType, /*IsCompAssign = */ false);
7308 }
7309
7310 /// Convert scalar operands to a vector that matches the
7311 /// condition in length.
7312 ///
7313 /// Used when handling the OpenCL conditional operator where the
7314 /// condition is a vector while the other operands are scalar.
7315 ///
7316 /// We first compute the "result type" for the scalar operands
7317 /// according to OpenCL v1.1 s6.3.i. Both operands are then converted
7318 /// into a vector of that type where the length matches the condition
7319 /// vector type. s6.11.6 requires that the element types of the result
7320 /// and the condition must have the same number of bits.
7321 static QualType
7322 OpenCLConvertScalarsToVectors(Sema &S, ExprResult &LHS, ExprResult &RHS,
7323 QualType CondTy, SourceLocation QuestionLoc) {
7324 QualType ResTy = OpenCLArithmeticConversions(S, LHS, RHS, QuestionLoc);
7325 if (ResTy.isNull()) return QualType();
7326
7327 const VectorType *CV = CondTy->getAs<VectorType>();
7328 assert(CV);
7329
7330 // Determine the vector result type
7331 unsigned NumElements = CV->getNumElements();
7332 QualType VectorTy = S.Context.getExtVectorType(ResTy, NumElements);
7333
7334 // Ensure that all types have the same number of bits
7335 if (S.Context.getTypeSize(CV->getElementType())
7336 != S.Context.getTypeSize(ResTy)) {
7337 // Since VectorTy is created internally, it does not pretty print
7338 // with an OpenCL name. Instead, we just print a description.
7339 std::string EleTyName = ResTy.getUnqualifiedType().getAsString();
7340 SmallString<64> Str;
7341 llvm::raw_svector_ostream OS(Str);
7342 OS << "(vector of " << NumElements << " '" << EleTyName << "' values)";
7343 S.Diag(QuestionLoc, diag::err_conditional_vector_element_size)
7344 << CondTy << OS.str();
7345 return QualType();
7346 }
7347
7348 // Convert operands to the vector result type
7349 LHS = S.ImpCastExprToType(LHS.get(), VectorTy, CK_VectorSplat);
7350 RHS = S.ImpCastExprToType(RHS.get(), VectorTy, CK_VectorSplat);
7351
7352 return VectorTy;
7353 }
7354
7355 /// Return false if this is a valid OpenCL condition vector
7356 static bool checkOpenCLConditionVector(Sema &S, Expr *Cond,
7357 SourceLocation QuestionLoc) {
7358 // OpenCL v1.1 s6.11.6 says the elements of the vector must be of
7359 // integral type.
7360 const VectorType *CondTy = Cond->getType()->getAs<VectorType>();
7361 assert(CondTy);
7362 QualType EleTy = CondTy->getElementType();
7363 if (EleTy->isIntegerType()) return false;
7364
7365 S.Diag(QuestionLoc, diag::err_typecheck_cond_expect_nonfloat)
7366 << Cond->getType() << Cond->getSourceRange();
7367 return true;
7368 }
7369
7370 /// Return false if the vector condition type and the vector
7371 /// result type are compatible.
7372 ///
7373 /// OpenCL v1.1 s6.11.6 requires that both vector types have the same
7374 /// number of elements, and their element types have the same number
7375 /// of bits.
7376 static bool checkVectorResult(Sema &S, QualType CondTy, QualType VecResTy,
7377 SourceLocation QuestionLoc) {
7378 const VectorType *CV = CondTy->getAs<VectorType>();
7379 const VectorType *RV = VecResTy->getAs<VectorType>();
7380 assert(CV && RV);
7381
7382 if (CV->getNumElements() != RV->getNumElements()) {
7383 S.Diag(QuestionLoc, diag::err_conditional_vector_size)
7384 << CondTy << VecResTy;
7385 return true;
7386 }
7387
7388 QualType CVE = CV->getElementType();
7389 QualType RVE = RV->getElementType();
7390
7391 if (S.Context.getTypeSize(CVE) != S.Context.getTypeSize(RVE)) {
7392 S.Diag(QuestionLoc, diag::err_conditional_vector_element_size)
7393 << CondTy << VecResTy;
7394 return true;
7395 }
7396
7397 return false;
7398 }
7399
7400 /// Return the resulting type for the conditional operator in
7401 /// OpenCL (aka "ternary selection operator", OpenCL v1.1
7402 /// s6.3.i) when the condition is a vector type.
7403 static QualType
7404 OpenCLCheckVectorConditional(Sema &S, ExprResult &Cond,
7405 ExprResult &LHS, ExprResult &RHS,
7406 SourceLocation QuestionLoc) {
7407 Cond = S.DefaultFunctionArrayLvalueConversion(Cond.get());
7408 if (Cond.isInvalid())
7409 return QualType();
7410 QualType CondTy = Cond.get()->getType();
7411
7412 if (checkOpenCLConditionVector(S, Cond.get(), QuestionLoc))
7413 return QualType();
7414
7415 // If either operand is a vector then find the vector type of the
7416 // result as specified in OpenCL v1.1 s6.3.i.
7417 if (LHS.get()->getType()->isVectorType() ||
7418 RHS.get()->getType()->isVectorType()) {
7419 QualType VecResTy = S.CheckVectorOperands(LHS, RHS, QuestionLoc,
7420 /*isCompAssign*/false,
7421 /*AllowBothBool*/true,
7422 /*AllowBoolConversions*/false);
7423 if (VecResTy.isNull()) return QualType();
7424 // The result type must match the condition type as specified in
7425 // OpenCL v1.1 s6.11.6.
7426 if (checkVectorResult(S, CondTy, VecResTy, QuestionLoc))
7427 return QualType();
7428 return VecResTy;
7429 }
7430
7431 // Both operands are scalar.
7432 return OpenCLConvertScalarsToVectors(S, LHS, RHS, CondTy, QuestionLoc);
7433 }
7434
7435 /// Return true if the Expr is block type
7436 static bool checkBlockType(Sema &S, const Expr *E) {
7437 if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
7438 QualType Ty = CE->getCallee()->getType();
7439 if (Ty->isBlockPointerType()) {
7440 S.Diag(E->getExprLoc(), diag::err_opencl_ternary_with_block);
7441 return true;
7442 }
7443 }
7444 return false;
7445 }
7446
7447 /// Note that LHS is not null here, even if this is the gnu "x ?: y" extension.
7448 /// In that case, LHS = cond.
7449 /// C99 6.5.15
7450 QualType Sema::CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS,
7451 ExprResult &RHS, ExprValueKind &VK,
7452 ExprObjectKind &OK,
7453 SourceLocation QuestionLoc) {
7454
7455 ExprResult LHSResult = CheckPlaceholderExpr(LHS.get());
7456 if (!LHSResult.isUsable()) return QualType();
7457 LHS = LHSResult;
7458
7459 ExprResult RHSResult = CheckPlaceholderExpr(RHS.get());
7460 if (!RHSResult.isUsable()) return QualType();
7461 RHS = RHSResult;
7462
7463 // C++ is sufficiently different to merit its own checker.
7464 if (getLangOpts().CPlusPlus)
7465 return CXXCheckConditionalOperands(Cond, LHS, RHS, VK, OK, QuestionLoc);
7466
7467 VK = VK_RValue;
7468 OK = OK_Ordinary;
7469
7470 // The OpenCL operator with a vector condition is sufficiently
7471 // different to merit its own checker.
7472 if (getLangOpts().OpenCL && Cond.get()->getType()->isVectorType())
7473 return OpenCLCheckVectorConditional(*this, Cond, LHS, RHS, QuestionLoc);
7474
7475 // First, check the condition.
7476 Cond = UsualUnaryConversions(Cond.get());
7477 if (Cond.isInvalid())
7478 return QualType();
7479 if (checkCondition(*this, Cond.get(), QuestionLoc))
7480 return QualType();
7481
7482 // Now check the two expressions.
7483 if (LHS.get()->getType()->isVectorType() ||
7484 RHS.get()->getType()->isVectorType())
7485 return CheckVectorOperands(LHS, RHS, QuestionLoc, /*isCompAssign*/false,
7486 /*AllowBothBool*/true,
7487 /*AllowBoolConversions*/false);
7488
7489 QualType ResTy =
7490 UsualArithmeticConversions(LHS, RHS, QuestionLoc, ACK_Conditional);
7491 if (LHS.isInvalid() || RHS.isInvalid())
7492 return QualType();
7493
7494 QualType LHSTy = LHS.get()->getType();
7495 QualType RHSTy = RHS.get()->getType();
7496
7497 // Diagnose attempts to convert between __float128 and long double where
7498 // such conversions currently can't be handled.
7499 if (unsupportedTypeConversion(*this, LHSTy, RHSTy)) {
7500 Diag(QuestionLoc,
7501 diag::err_typecheck_cond_incompatible_operands) << LHSTy << RHSTy
7502 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
7503 return QualType();
7504 }
7505
7506 // OpenCL v2.0 s6.12.5 - Blocks cannot be used as expressions of the ternary
7507 // selection operator (?:).
7508 if (getLangOpts().OpenCL &&
7509 (checkBlockType(*this, LHS.get()) | checkBlockType(*this, RHS.get()))) {
7510 return QualType();
7511 }
7512
7513 // If both operands have arithmetic type, do the usual arithmetic conversions
7514 // to find a common type: C99 6.5.15p3,5.
7515 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
7516 LHS = ImpCastExprToType(LHS.get(), ResTy, PrepareScalarCast(LHS, ResTy));
7517 RHS = ImpCastExprToType(RHS.get(), ResTy, PrepareScalarCast(RHS, ResTy));
7518
7519 return ResTy;
7520 }
7521
7522 // If both operands are the same structure or union type, the result is that
7523 // type.
7524 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3
7525 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
7526 if (LHSRT->getDecl() == RHSRT->getDecl())
7527 // "If both the operands have structure or union type, the result has
7528 // that type." This implies that CV qualifiers are dropped.
7529 return LHSTy.getUnqualifiedType();
7530 // FIXME: Type of conditional expression must be complete in C mode.
7531 }
7532
7533 // C99 6.5.15p5: "If both operands have void type, the result has void type."
7534 // The following || allows only one side to be void (a GCC-ism).
7535 if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
7536 return checkConditionalVoidType(*this, LHS, RHS);
7537 }
7538
7539 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
7540 // the type of the other operand."
7541 if (!checkConditionalNullPointer(*this, RHS, LHSTy)) return LHSTy;
7542 if (!checkConditionalNullPointer(*this, LHS, RHSTy)) return RHSTy;
7543
7544 // All objective-c pointer type analysis is done here.
7545 QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
7546 QuestionLoc);
7547 if (LHS.isInvalid() || RHS.isInvalid())
7548 return QualType();
7549 if (!compositeType.isNull())
7550 return compositeType;
7551
7552
7553 // Handle block pointer types.
7554 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType())
7555 return checkConditionalBlockPointerCompatibility(*this, LHS, RHS,
7556 QuestionLoc);
7557
7558 // Check constraints for C object pointers types (C99 6.5.15p3,6).
7559 if (LHSTy->isPointerType() && RHSTy->isPointerType())
7560 return checkConditionalObjectPointersCompatibility(*this, LHS, RHS,
7561 QuestionLoc);
7562
7563 // GCC compatibility: soften pointer/integer mismatch. Note that
7564 // null pointers have been filtered out by this point.
7565 if (checkPointerIntegerMismatch(*this, LHS, RHS.get(), QuestionLoc,
7566 /*IsIntFirstExpr=*/true))
7567 return RHSTy;
7568 if (checkPointerIntegerMismatch(*this, RHS, LHS.get(), QuestionLoc,
7569 /*IsIntFirstExpr=*/false))
7570 return LHSTy;
7571
7572 // Emit a better diagnostic if one of the expressions is a null pointer
7573 // constant and the other is not a pointer type. In this case, the user most
7574 // likely forgot to take the address of the other expression.
7575 if (DiagnoseConditionalForNull(LHS.get(), RHS.get(), QuestionLoc))
7576 return QualType();
7577
7578 // Otherwise, the operands are not compatible.
7579 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
7580 << LHSTy << RHSTy << LHS.get()->getSourceRange()
7581 << RHS.get()->getSourceRange();
7582 return QualType();
7583 }
7584
7585 /// FindCompositeObjCPointerType - Helper method to find composite type of
7586 /// two objective-c pointer types of the two input expressions.
7587 QualType Sema::FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS,
7588 SourceLocation QuestionLoc) {
7589 QualType LHSTy = LHS.get()->getType();
7590 QualType RHSTy = RHS.get()->getType();
7591
7592 // Handle things like Class and struct objc_class*. Here we case the result
7593 // to the pseudo-builtin, because that will be implicitly cast back to the
7594 // redefinition type if an attempt is made to access its fields.
7595 if (LHSTy->isObjCClassType() &&
7596 (Context.hasSameType(RHSTy, Context.getObjCClassRedefinitionType()))) {
7597 RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_CPointerToObjCPointerCast);
7598 return LHSTy;
7599 }
7600 if (RHSTy->isObjCClassType() &&
7601 (Context.hasSameType(LHSTy, Context.getObjCClassRedefinitionType()))) {
7602 LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_CPointerToObjCPointerCast);
7603 return RHSTy;
7604 }
7605 // And the same for struct objc_object* / id
7606 if (LHSTy->isObjCIdType() &&
7607 (Context.hasSameType(RHSTy, Context.getObjCIdRedefinitionType()))) {
7608 RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_CPointerToObjCPointerCast);
7609 return LHSTy;
7610 }
7611 if (RHSTy->isObjCIdType() &&
7612 (Context.hasSameType(LHSTy, Context.getObjCIdRedefinitionType()))) {
7613 LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_CPointerToObjCPointerCast);
7614 return RHSTy;
7615 }
7616 // And the same for struct objc_selector* / SEL
7617 if (Context.isObjCSelType(LHSTy) &&
7618 (Context.hasSameType(RHSTy, Context.getObjCSelRedefinitionType()))) {
7619 RHS = ImpCastExprToType(RHS.get(), LHSTy, CK_BitCast);
7620 return LHSTy;
7621 }
7622 if (Context.isObjCSelType(RHSTy) &&
7623 (Context.hasSameType(LHSTy, Context.getObjCSelRedefinitionType()))) {
7624 LHS = ImpCastExprToType(LHS.get(), RHSTy, CK_BitCast);
7625 return RHSTy;
7626 }
7627 // Check constraints for Objective-C object pointers types.
7628 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
7629
7630 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
7631 // Two identical object pointer types are always compatible.
7632 return LHSTy;
7633 }
7634 const ObjCObjectPointerType *LHSOPT = LHSTy->castAs<ObjCObjectPointerType>();
7635 const ObjCObjectPointerType *RHSOPT = RHSTy->castAs<ObjCObjectPointerType>();
7636 QualType compositeType = LHSTy;
7637
7638 // If both operands are interfaces and either operand can be
7639 // assigned to the other, use that type as the composite
7640 // type. This allows
7641 // xxx ? (A*) a : (B*) b
7642 // where B is a subclass of A.
7643 //
7644 // Additionally, as for assignment, if either type is 'id'
7645 // allow silent coercion. Finally, if the types are
7646 // incompatible then make sure to use 'id' as the composite
7647 // type so the result is acceptable for sending messages to.
7648
7649 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
7650 // It could return the composite type.
7651 if (!(compositeType =
7652 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull()) {
7653 // Nothing more to do.
7654 } else if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
7655 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
7656 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
7657 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
7658 } else if ((LHSOPT->isObjCQualifiedIdType() ||
7659 RHSOPT->isObjCQualifiedIdType()) &&
7660 Context.ObjCQualifiedIdTypesAreCompatible(LHSOPT, RHSOPT,
7661 true)) {
7662 // Need to handle "id<xx>" explicitly.
7663 // GCC allows qualified id and any Objective-C type to devolve to
7664 // id. Currently localizing to here until clear this should be
7665 // part of ObjCQualifiedIdTypesAreCompatible.
7666 compositeType = Context.getObjCIdType();
7667 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
7668 compositeType = Context.getObjCIdType();
7669 } else {
7670 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
7671 << LHSTy << RHSTy
7672 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
7673 QualType incompatTy = Context.getObjCIdType();
7674 LHS = ImpCastExprToType(LHS.get(), incompatTy, CK_BitCast);
7675 RHS = ImpCastExprToType(RHS.get(), incompatTy, CK_BitCast);
7676 return incompatTy;
7677 }
7678 // The object pointer types are compatible.
7679 LHS = ImpCastExprToType(LHS.get(), compositeType, CK_BitCast);
7680 RHS = ImpCastExprToType(RHS.get(), compositeType, CK_BitCast);
7681 return compositeType;
7682 }
7683 // Check Objective-C object pointer types and 'void *'
7684 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
7685 if (getLangOpts().ObjCAutoRefCount) {
7686 // ARC forbids the implicit conversion of object pointers to 'void *',
7687 // so these types are not compatible.
7688 Diag(QuestionLoc, diag::err_cond_voidptr_arc) << LHSTy << RHSTy
7689 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
7690 LHS = RHS = true;
7691 return QualType();
7692 }
7693 QualType lhptee = LHSTy->castAs<PointerType>()->getPointeeType();
7694 QualType rhptee = RHSTy->castAs<ObjCObjectPointerType>()->getPointeeType();
7695 QualType destPointee
7696 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
7697 QualType destType = Context.getPointerType(destPointee);
7698 // Add qualifiers if necessary.
7699 LHS = ImpCastExprToType(LHS.get(), destType, CK_NoOp);
7700 // Promote to void*.
7701 RHS = ImpCastExprToType(RHS.get(), destType, CK_BitCast);
7702 return destType;
7703 }
7704 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
7705 if (getLangOpts().ObjCAutoRefCount) {
7706 // ARC forbids the implicit conversion of object pointers to 'void *',
7707 // so these types are not compatible.
7708 Diag(QuestionLoc, diag::err_cond_voidptr_arc) << LHSTy << RHSTy
7709 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
7710 LHS = RHS = true;
7711 return QualType();
7712 }
7713 QualType lhptee = LHSTy->castAs<ObjCObjectPointerType>()->getPointeeType();
7714 QualType rhptee = RHSTy->castAs<PointerType>()->getPointeeType();
7715 QualType destPointee
7716 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
7717 QualType destType = Context.getPointerType(destPointee);
7718 // Add qualifiers if necessary.
7719 RHS = ImpCastExprToType(RHS.get(), destType, CK_NoOp);
7720 // Promote to void*.
7721 LHS = ImpCastExprToType(LHS.get(), destType, CK_BitCast);
7722 return destType;
7723 }
7724 return QualType();
7725 }
7726
7727 /// SuggestParentheses - Emit a note with a fixit hint that wraps
7728 /// ParenRange in parentheses.
7729 static void SuggestParentheses(Sema &Self, SourceLocation Loc,
7730 const PartialDiagnostic &Note,
7731 SourceRange ParenRange) {
7732 SourceLocation EndLoc = Self.getLocForEndOfToken(ParenRange.getEnd());
7733 if (ParenRange.getBegin().isFileID() && ParenRange.getEnd().isFileID() &&
7734 EndLoc.isValid()) {
7735 Self.Diag(Loc, Note)
7736 << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
7737 << FixItHint::CreateInsertion(EndLoc, ")");
7738 } else {
7739 // We can't display the parentheses, so just show the bare note.
7740 Self.Diag(Loc, Note) << ParenRange;
7741 }
7742 }
7743
7744 static bool IsArithmeticOp(BinaryOperatorKind Opc) {
7745 return BinaryOperator::isAdditiveOp(Opc) ||
7746 BinaryOperator::isMultiplicativeOp(Opc) ||
7747 BinaryOperator::isShiftOp(Opc) || Opc == BO_And || Opc == BO_Or;
7748 // This only checks for bitwise-or and bitwise-and, but not bitwise-xor and
7749 // not any of the logical operators. Bitwise-xor is commonly used as a
7750 // logical-xor because there is no logical-xor operator. The logical
7751 // operators, including uses of xor, have a high false positive rate for
7752 // precedence warnings.
7753 }
7754
7755 /// IsArithmeticBinaryExpr - Returns true if E is an arithmetic binary
7756 /// expression, either using a built-in or overloaded operator,
7757 /// and sets *OpCode to the opcode and *RHSExprs to the right-hand side
7758 /// expression.
7759 static bool IsArithmeticBinaryExpr(Expr *E, BinaryOperatorKind *Opcode,
7760 Expr **RHSExprs) {
7761 // Don't strip parenthesis: we should not warn if E is in parenthesis.
7762 E = E->IgnoreImpCasts();
7763 E = E->IgnoreConversionOperator();
7764 E = E->IgnoreImpCasts();
7765 if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E)) {
7766 E = MTE->getSubExpr();
7767 E = E->IgnoreImpCasts();
7768 }
7769
7770 // Built-in binary operator.
7771 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E)) {
7772 if (IsArithmeticOp(OP->getOpcode())) {
7773 *Opcode = OP->getOpcode();
7774 *RHSExprs = OP->getRHS();
7775 return true;
7776 }
7777 }
7778
7779 // Overloaded operator.
7780 if (CXXOperatorCallExpr *Call = dyn_cast<CXXOperatorCallExpr>(E)) {
7781 if (Call->getNumArgs() != 2)
7782 return false;
7783
7784 // Make sure this is really a binary operator that is safe to pass into
7785 // BinaryOperator::getOverloadedOpcode(), e.g. it's not a subscript op.
7786 OverloadedOperatorKind OO = Call->getOperator();
7787 if (OO < OO_Plus || OO > OO_Arrow ||
7788 OO == OO_PlusPlus || OO == OO_MinusMinus)
7789 return false;
7790
7791 BinaryOperatorKind OpKind = BinaryOperator::getOverloadedOpcode(OO);
7792 if (IsArithmeticOp(OpKind)) {
7793 *Opcode = OpKind;
7794 *RHSExprs = Call->getArg(1);
7795 return true;
7796 }
7797 }
7798
7799 return false;
7800 }
7801
7802 /// ExprLooksBoolean - Returns true if E looks boolean, i.e. it has boolean type
7803 /// or is a logical expression such as (x==y) which has int type, but is
7804 /// commonly interpreted as boolean.
7805 static bool ExprLooksBoolean(Expr *E) {
7806 E = E->IgnoreParenImpCasts();
7807
7808 if (E->getType()->isBooleanType())
7809 return true;
7810 if (BinaryOperator *OP = dyn_cast<BinaryOperator>(E))
7811 return OP->isComparisonOp() || OP->isLogicalOp();
7812 if (UnaryOperator *OP = dyn_cast<UnaryOperator>(E))
7813 return OP->getOpcode() == UO_LNot;
7814 if (E->getType()->isPointerType())
7815 return true;
7816 // FIXME: What about overloaded operator calls returning "unspecified boolean
7817 // type"s (commonly pointer-to-members)?
7818
7819 return false;
7820 }
7821
7822 /// DiagnoseConditionalPrecedence - Emit a warning when a conditional operator
7823 /// and binary operator are mixed in a way that suggests the programmer assumed
7824 /// the conditional operator has higher precedence, for example:
7825 /// "int x = a + someBinaryCondition ? 1 : 2".
7826 static void DiagnoseConditionalPrecedence(Sema &Self,
7827 SourceLocation OpLoc,
7828 Expr *Condition,
7829 Expr *LHSExpr,
7830 Expr *RHSExpr) {
7831 BinaryOperatorKind CondOpcode;
7832 Expr *CondRHS;
7833
7834 if (!IsArithmeticBinaryExpr(Condition, &CondOpcode, &CondRHS))
7835 return;
7836 if (!ExprLooksBoolean(CondRHS))
7837 return;
7838
7839 // The condition is an arithmetic binary expression, with a right-
7840 // hand side that looks boolean, so warn.
7841
7842 unsigned DiagID = BinaryOperator::isBitwiseOp(CondOpcode)
7843 ? diag::warn_precedence_bitwise_conditional
7844 : diag::warn_precedence_conditional;
7845
7846 Self.Diag(OpLoc, DiagID)
7847 << Condition->getSourceRange()
7848 << BinaryOperator::getOpcodeStr(CondOpcode);
7849
7850 SuggestParentheses(
7851 Self, OpLoc,
7852 Self.PDiag(diag::note_precedence_silence)
7853 << BinaryOperator::getOpcodeStr(CondOpcode),
7854 SourceRange(Condition->getBeginLoc(), Condition->getEndLoc()));
7855
7856 SuggestParentheses(Self, OpLoc,
7857 Self.PDiag(diag::note_precedence_conditional_first),
7858 SourceRange(CondRHS->getBeginLoc(), RHSExpr->getEndLoc()));
7859 }
7860
7861 /// Compute the nullability of a conditional expression.
7862 static QualType computeConditionalNullability(QualType ResTy, bool IsBin,
7863 QualType LHSTy, QualType RHSTy,
7864 ASTContext &Ctx) {
7865 if (!ResTy->isAnyPointerType())
7866 return ResTy;
7867
7868 auto GetNullability = [&Ctx](QualType Ty) {
7869 Optional<NullabilityKind> Kind = Ty->getNullability(Ctx);
7870 if (Kind)
7871 return *Kind;
7872 return NullabilityKind::Unspecified;
7873 };
7874
7875 auto LHSKind = GetNullability(LHSTy), RHSKind = GetNullability(RHSTy);
7876 NullabilityKind MergedKind;
7877
7878 // Compute nullability of a binary conditional expression.
7879 if (IsBin) {
7880 if (LHSKind == NullabilityKind::NonNull)
7881 MergedKind = NullabilityKind::NonNull;
7882 else
7883 MergedKind = RHSKind;
7884 // Compute nullability of a normal conditional expression.
7885 } else {
7886 if (LHSKind == NullabilityKind::Nullable ||
7887 RHSKind == NullabilityKind::Nullable)
7888 MergedKind = NullabilityKind::Nullable;
7889 else if (LHSKind == NullabilityKind::NonNull)
7890 MergedKind = RHSKind;
7891 else if (RHSKind == NullabilityKind::NonNull)
7892 MergedKind = LHSKind;
7893 else
7894 MergedKind = NullabilityKind::Unspecified;
7895 }
7896
7897 // Return if ResTy already has the correct nullability.
7898 if (GetNullability(ResTy) == MergedKind)
7899 return ResTy;
7900
7901 // Strip all nullability from ResTy.
7902 while (ResTy->getNullability(Ctx))
7903 ResTy = ResTy.getSingleStepDesugaredType(Ctx);
7904
7905 // Create a new AttributedType with the new nullability kind.
7906 auto NewAttr = AttributedType::getNullabilityAttrKind(MergedKind);
7907 return Ctx.getAttributedType(NewAttr, ResTy, ResTy);
7908 }
7909
7910 /// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
7911 /// in the case of a the GNU conditional expr extension.
7912 ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
7913 SourceLocation ColonLoc,
7914 Expr *CondExpr, Expr *LHSExpr,
7915 Expr *RHSExpr) {
7916 if (!getLangOpts().CPlusPlus) {
7917 // C cannot handle TypoExpr nodes in the condition because it
7918 // doesn't handle dependent types properly, so make sure any TypoExprs have
7919 // been dealt with before checking the operands.
7920 ExprResult CondResult = CorrectDelayedTyposInExpr(CondExpr);
7921 ExprResult LHSResult = CorrectDelayedTyposInExpr(LHSExpr);
7922 ExprResult RHSResult = CorrectDelayedTyposInExpr(RHSExpr);
7923
7924 if (!CondResult.isUsable())
7925 return ExprError();
7926
7927 if (LHSExpr) {
7928 if (!LHSResult.isUsable())
7929 return ExprError();
7930 }
7931
7932 if (!RHSResult.isUsable())
7933 return ExprError();
7934
7935 CondExpr = CondResult.get();
7936 LHSExpr = LHSResult.get();
7937 RHSExpr = RHSResult.get();
7938 }
7939
7940 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS
7941 // was the condition.
7942 OpaqueValueExpr *opaqueValue = nullptr;
7943 Expr *commonExpr = nullptr;
7944 if (!LHSExpr) {
7945 commonExpr = CondExpr;
7946 // Lower out placeholder types first. This is important so that we don't
7947 // try to capture a placeholder. This happens in few cases in C++; such
7948 // as Objective-C++'s dictionary subscripting syntax.
7949 if (commonExpr->hasPlaceholderType()) {
7950 ExprResult result = CheckPlaceholderExpr(commonExpr);
7951 if (!result.isUsable()) return ExprError();
7952 commonExpr = result.get();
7953 }
7954 // We usually want to apply unary conversions *before* saving, except
7955 // in the special case of a C++ l-value conditional.
7956 if (!(getLangOpts().CPlusPlus
7957 && !commonExpr->isTypeDependent()
7958 && commonExpr->getValueKind() == RHSExpr->getValueKind()
7959 && commonExpr->isGLValue()
7960 && commonExpr->isOrdinaryOrBitFieldObject()
7961 && RHSExpr->isOrdinaryOrBitFieldObject()
7962 && Context.hasSameType(commonExpr->getType(), RHSExpr->getType()))) {
7963 ExprResult commonRes = UsualUnaryConversions(commonExpr);
7964 if (commonRes.isInvalid())
7965 return ExprError();
7966 commonExpr = commonRes.get();
7967 }
7968
7969 // If the common expression is a class or array prvalue, materialize it
7970 // so that we can safely refer to it multiple times.
7971 if (commonExpr->isRValue() && (commonExpr->getType()->isRecordType() ||
7972 commonExpr->getType()->isArrayType())) {
7973 ExprResult MatExpr = TemporaryMaterializationConversion(commonExpr);
7974 if (MatExpr.isInvalid())
7975 return ExprError();
7976 commonExpr = MatExpr.get();
7977 }
7978
7979 opaqueValue = new (Context) OpaqueValueExpr(commonExpr->getExprLoc(),
7980 commonExpr->getType(),
7981 commonExpr->getValueKind(),
7982 commonExpr->getObjectKind(),
7983 commonExpr);
7984 LHSExpr = CondExpr = opaqueValue;
7985 }
7986
7987 QualType LHSTy = LHSExpr->getType(), RHSTy = RHSExpr->getType();
7988 ExprValueKind VK = VK_RValue;
7989 ExprObjectKind OK = OK_Ordinary;
7990 ExprResult Cond = CondExpr, LHS = LHSExpr, RHS = RHSExpr;
7991 QualType result = CheckConditionalOperands(Cond, LHS, RHS,
7992 VK, OK, QuestionLoc);
7993 if (result.isNull() || Cond.isInvalid() || LHS.isInvalid() ||
7994 RHS.isInvalid())
7995 return ExprError();
7996
7997 DiagnoseConditionalPrecedence(*this, QuestionLoc, Cond.get(), LHS.get(),
7998 RHS.get());
7999
8000 CheckBoolLikeConversion(Cond.get(), QuestionLoc);
8001
8002 result = computeConditionalNullability(result, commonExpr, LHSTy, RHSTy,
8003 Context);
8004
8005 if (!commonExpr)
8006 return new (Context)
8007 ConditionalOperator(Cond.get(), QuestionLoc, LHS.get(), ColonLoc,
8008 RHS.get(), result, VK, OK);
8009
8010 return new (Context) BinaryConditionalOperator(
8011 commonExpr, opaqueValue, Cond.get(), LHS.get(), RHS.get(), QuestionLoc,
8012 ColonLoc, result, VK, OK);
8013 }
8014
8015 // checkPointerTypesForAssignment - This is a very tricky routine (despite
8016 // being closely modeled after the C99 spec:-). The odd characteristic of this
8017 // routine is it effectively iqnores the qualifiers on the top level pointee.
8018 // This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
8019 // FIXME: add a couple examples in this comment.
8020 static Sema::AssignConvertType
8021 checkPointerTypesForAssignment(Sema &S, QualType LHSType, QualType RHSType) {
8022 assert(LHSType.isCanonical() && "LHS not canonicalized!");
8023 assert(RHSType.isCanonical() && "RHS not canonicalized!");
8024
8025 // get the "pointed to" type (ignoring qualifiers at the top level)
8026 const Type *lhptee, *rhptee;
8027 Qualifiers lhq, rhq;
8028 std::tie(lhptee, lhq) =
8029 cast<PointerType>(LHSType)->getPointeeType().split().asPair();
8030 std::tie(rhptee, rhq) =
8031 cast<PointerType>(RHSType)->getPointeeType().split().asPair();
8032
8033 Sema::AssignConvertType ConvTy = Sema::Compatible;
8034
8035 // C99 6.5.16.1p1: This following citation is common to constraints
8036 // 3 & 4 (below). ...and the type *pointed to* by the left has all the
8037 // qualifiers of the type *pointed to* by the right;
8038
8039 // As a special case, 'non-__weak A *' -> 'non-__weak const *' is okay.
8040 if (lhq.getObjCLifetime() != rhq.getObjCLifetime() &&
8041 lhq.compatiblyIncludesObjCLifetime(rhq)) {
8042 // Ignore lifetime for further calculation.
8043 lhq.removeObjCLifetime();
8044 rhq.removeObjCLifetime();
8045 }
8046
8047 if (!lhq.compatiblyIncludes(rhq)) {
8048 // Treat address-space mismatches as fatal.
8049 if (!lhq.isAddressSpaceSupersetOf(rhq))
8050 return Sema::IncompatiblePointerDiscardsQualifiers;
8051
8052 // It's okay to add or remove GC or lifetime qualifiers when converting to
8053 // and from void*.
8054 else if (lhq.withoutObjCGCAttr().withoutObjCLifetime()
8055 .compatiblyIncludes(
8056 rhq.withoutObjCGCAttr().withoutObjCLifetime())
8057 && (lhptee->isVoidType() || rhptee->isVoidType()))
8058 ; // keep old
8059
8060 // Treat lifetime mismatches as fatal.
8061 else if (lhq.getObjCLifetime() != rhq.getObjCLifetime())
8062 ConvTy = Sema::IncompatiblePointerDiscardsQualifiers;
8063
8064 // For GCC/MS compatibility, other qualifier mismatches are treated
8065 // as still compatible in C.
8066 else ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
8067 }
8068
8069 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
8070 // incomplete type and the other is a pointer to a qualified or unqualified
8071 // version of void...
8072 if (lhptee->isVoidType()) {
8073 if (rhptee->isIncompleteOrObjectType())
8074 return ConvTy;
8075
8076 // As an extension, we allow cast to/from void* to function pointer.
8077 assert(rhptee->isFunctionType());
8078 return Sema::FunctionVoidPointer;
8079 }
8080
8081 if (rhptee->isVoidType()) {
8082 if (lhptee->isIncompleteOrObjectType())
8083 return ConvTy;
8084
8085 // As an extension, we allow cast to/from void* to function pointer.
8086 assert(lhptee->isFunctionType());
8087 return Sema::FunctionVoidPointer;
8088 }
8089
8090 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
8091 // unqualified versions of compatible types, ...
8092 QualType ltrans = QualType(lhptee, 0), rtrans = QualType(rhptee, 0);
8093 if (!S.Context.typesAreCompatible(ltrans, rtrans)) {
8094 // Check if the pointee types are compatible ignoring the sign.
8095 // We explicitly check for char so that we catch "char" vs
8096 // "unsigned char" on systems where "char" is unsigned.
8097 if (lhptee->isCharType())
8098 ltrans = S.Context.UnsignedCharTy;
8099 else if (lhptee->hasSignedIntegerRepresentation())
8100 ltrans = S.Context.getCorrespondingUnsignedType(ltrans);
8101
8102 if (rhptee->isCharType())
8103 rtrans = S.Context.UnsignedCharTy;
8104 else if (rhptee->hasSignedIntegerRepresentation())
8105 rtrans = S.Context.getCorrespondingUnsignedType(rtrans);
8106
8107 if (ltrans == rtrans) {
8108 // Types are compatible ignoring the sign. Qualifier incompatibility
8109 // takes priority over sign incompatibility because the sign
8110 // warning can be disabled.
8111 if (ConvTy != Sema::Compatible)
8112 return ConvTy;
8113
8114 return Sema::IncompatiblePointerSign;
8115 }
8116
8117 // If we are a multi-level pointer, it's possible that our issue is simply
8118 // one of qualification - e.g. char ** -> const char ** is not allowed. If
8119 // the eventual target type is the same and the pointers have the same
8120 // level of indirection, this must be the issue.
8121 if (isa<PointerType>(lhptee) && isa<PointerType>(rhptee)) {
8122 do {
8123 std::tie(lhptee, lhq) =
8124 cast<PointerType>(lhptee)->getPointeeType().split().asPair();
8125 std::tie(rhptee, rhq) =
8126 cast<PointerType>(rhptee)->getPointeeType().split().asPair();
8127
8128 // Inconsistent address spaces at this point is invalid, even if the
8129 // address spaces would be compatible.
8130 // FIXME: This doesn't catch address space mismatches for pointers of
8131 // different nesting levels, like:
8132 // __local int *** a;
8133 // int ** b = a;
8134 // It's not clear how to actually determine when such pointers are
8135 // invalidly incompatible.
8136 if (lhq.getAddressSpace() != rhq.getAddressSpace())
8137 return Sema::IncompatibleNestedPointerAddressSpaceMismatch;
8138
8139 } while (isa<PointerType>(lhptee) && isa<PointerType>(rhptee));
8140
8141 if (lhptee == rhptee)
8142 return Sema::IncompatibleNestedPointerQualifiers;
8143 }
8144
8145 // General pointer incompatibility takes priority over qualifiers.
8146 return Sema::IncompatiblePointer;
8147 }
8148 if (!S.getLangOpts().CPlusPlus &&
8149 S.IsFunctionConversion(ltrans, rtrans, ltrans))
8150 return Sema::IncompatiblePointer;
8151 return ConvTy;
8152 }
8153
8154 /// checkBlockPointerTypesForAssignment - This routine determines whether two
8155 /// block pointer types are compatible or whether a block and normal pointer
8156 /// are compatible. It is more restrict than comparing two function pointer
8157 // types.
8158 static Sema::AssignConvertType
8159 checkBlockPointerTypesForAssignment(Sema &S, QualType LHSType,
8160 QualType RHSType) {
8161 assert(LHSType.isCanonical() && "LHS not canonicalized!");
8162 assert(RHSType.isCanonical() && "RHS not canonicalized!");
8163
8164 QualType lhptee, rhptee;
8165
8166 // get the "pointed to" type (ignoring qualifiers at the top level)
8167 lhptee = cast<BlockPointerType>(LHSType)->getPointeeType();
8168 rhptee = cast<BlockPointerType>(RHSType)->getPointeeType();
8169
8170 // In C++, the types have to match exactly.
8171 if (S.getLangOpts().CPlusPlus)
8172 return Sema::IncompatibleBlockPointer;
8173
8174 Sema::AssignConvertType ConvTy = Sema::Compatible;
8175
8176 // For blocks we enforce that qualifiers are identical.
8177 Qualifiers LQuals = lhptee.getLocalQualifiers();
8178 Qualifiers RQuals = rhptee.getLocalQualifiers();
8179 if (S.getLangOpts().OpenCL) {
8180 LQuals.removeAddressSpace();
8181 RQuals.removeAddressSpace();
8182 }
8183 if (LQuals != RQuals)
8184 ConvTy = Sema::CompatiblePointerDiscardsQualifiers;
8185
8186 // FIXME: OpenCL doesn't define the exact compile time semantics for a block
8187 // assignment.
8188 // The current behavior is similar to C++ lambdas. A block might be
8189 // assigned to a variable iff its return type and parameters are compatible
8190 // (C99 6.2.7) with the corresponding return type and parameters of the LHS of
8191 // an assignment. Presumably it should behave in way that a function pointer
8192 // assignment does in C, so for each parameter and return type:
8193 // * CVR and address space of LHS should be a superset of CVR and address
8194 // space of RHS.
8195 // * unqualified types should be compatible.
8196 if (S.getLangOpts().OpenCL) {
8197 if (!S.Context.typesAreBlockPointerCompatible(
8198 S.Context.getQualifiedType(LHSType.getUnqualifiedType(), LQuals),
8199 S.Context.getQualifiedType(RHSType.getUnqualifiedType(), RQuals)))
8200 return Sema::IncompatibleBlockPointer;
8201 } else if (!S.Context.typesAreBlockPointerCompatible(LHSType, RHSType))
8202 return Sema::IncompatibleBlockPointer;
8203
8204 return ConvTy;
8205 }
8206
8207 /// checkObjCPointerTypesForAssignment - Compares two objective-c pointer types
8208 /// for assignment compatibility.
8209 static Sema::AssignConvertType
8210 checkObjCPointerTypesForAssignment(Sema &S, QualType LHSType,
8211 QualType RHSType) {
8212 assert(LHSType.isCanonical() && "LHS was not canonicalized!");
8213 assert(RHSType.isCanonical() && "RHS was not canonicalized!");
8214
8215 if (LHSType->isObjCBuiltinType()) {
8216 // Class is not compatible with ObjC object pointers.
8217 if (LHSType->isObjCClassType() && !RHSType->isObjCBuiltinType() &&
8218 !RHSType->isObjCQualifiedClassType())
8219 return Sema::IncompatiblePointer;
8220 return Sema::Compatible;
8221 }
8222 if (RHSType->isObjCBuiltinType()) {
8223 if (RHSType->isObjCClassType() && !LHSType->isObjCBuiltinType() &&
8224 !LHSType->isObjCQualifiedClassType())
8225 return Sema::IncompatiblePointer;
8226 return Sema::Compatible;
8227 }
8228 QualType lhptee = LHSType->castAs<ObjCObjectPointerType>()->getPointeeType();
8229 QualType rhptee = RHSType->castAs<ObjCObjectPointerType>()->getPointeeType();
8230
8231 if (!lhptee.isAtLeastAsQualifiedAs(rhptee) &&
8232 // make an exception for id<P>
8233 !LHSType->isObjCQualifiedIdType())
8234 return Sema::CompatiblePointerDiscardsQualifiers;
8235
8236 if (S.Context.typesAreCompatible(LHSType, RHSType))
8237 return Sema::Compatible;
8238 if (LHSType->isObjCQualifiedIdType() || RHSType->isObjCQualifiedIdType())
8239 return Sema::IncompatibleObjCQualifiedId;
8240 return Sema::IncompatiblePointer;
8241 }
8242
8243 Sema::AssignConvertType
8244 Sema::CheckAssignmentConstraints(SourceLocation Loc,
8245 QualType LHSType, QualType RHSType) {
8246 // Fake up an opaque expression. We don't actually care about what
8247 // cast operations are required, so if CheckAssignmentConstraints
8248 // adds casts to this they'll be wasted, but fortunately that doesn't
8249 // usually happen on valid code.
8250 OpaqueValueExpr RHSExpr(Loc, RHSType, VK_RValue);
8251 ExprResult RHSPtr = &RHSExpr;
8252 CastKind K;
8253
8254 return CheckAssignmentConstraints(LHSType, RHSPtr, K, /*ConvertRHS=*/false);
8255 }
8256
8257 /// This helper function returns true if QT is a vector type that has element
8258 /// type ElementType.
8259 static bool isVector(QualType QT, QualType ElementType) {
8260 if (const VectorType *VT = QT->getAs<VectorType>())
8261 return VT->getElementType() == ElementType;
8262 return false;
8263 }
8264
8265 /// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
8266 /// has code to accommodate several GCC extensions when type checking
8267 /// pointers. Here are some objectionable examples that GCC considers warnings:
8268 ///
8269 /// int a, *pint;
8270 /// short *pshort;
8271 /// struct foo *pfoo;
8272 ///
8273 /// pint = pshort; // warning: assignment from incompatible pointer type
8274 /// a = pint; // warning: assignment makes integer from pointer without a cast
8275 /// pint = a; // warning: assignment makes pointer from integer without a cast
8276 /// pint = pfoo; // warning: assignment from incompatible pointer type
8277 ///
8278 /// As a result, the code for dealing with pointers is more complex than the
8279 /// C99 spec dictates.
8280 ///
8281 /// Sets 'Kind' for any result kind except Incompatible.
8282 Sema::AssignConvertType
8283 Sema::CheckAssignmentConstraints(QualType LHSType, ExprResult &RHS,
8284 CastKind &Kind, bool ConvertRHS) {
8285 QualType RHSType = RHS.get()->getType();
8286 QualType OrigLHSType = LHSType;
8287
8288 // Get canonical types. We're not formatting these types, just comparing
8289 // them.
8290 LHSType = Context.getCanonicalType(LHSType).getUnqualifiedType();
8291 RHSType = Context.getCanonicalType(RHSType).getUnqualifiedType();
8292
8293 // Common case: no conversion required.
8294 if (LHSType == RHSType) {
8295 Kind = CK_NoOp;
8296 return Compatible;
8297 }
8298
8299 // If we have an atomic type, try a non-atomic assignment, then just add an
8300 // atomic qualification step.
8301 if (const AtomicType *AtomicTy = dyn_cast<AtomicType>(LHSType)) {
8302 Sema::AssignConvertType result =
8303 CheckAssignmentConstraints(AtomicTy->getValueType(), RHS, Kind);
8304 if (result != Compatible)
8305 return result;
8306 if (Kind != CK_NoOp && ConvertRHS)
8307 RHS = ImpCastExprToType(RHS.get(), AtomicTy->getValueType(), Kind);
8308 Kind = CK_NonAtomicToAtomic;
8309 return Compatible;
8310 }
8311
8312 // If the left-hand side is a reference type, then we are in a
8313 // (rare!) case where we've allowed the use of references in C,
8314 // e.g., as a parameter type in a built-in function. In this case,
8315 // just make sure that the type referenced is compatible with the
8316 // right-hand side type. The caller is responsible for adjusting
8317 // LHSType so that the resulting expression does not have reference
8318 // type.
8319 if (const ReferenceType *LHSTypeRef = LHSType->getAs<ReferenceType>()) {
8320 if (Context.typesAreCompatible(LHSTypeRef->getPointeeType(), RHSType)) {
8321 Kind = CK_LValueBitCast;
8322 return Compatible;
8323 }
8324 return Incompatible;
8325 }
8326
8327 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type
8328 // to the same ExtVector type.
8329 if (LHSType->isExtVectorType()) {
8330 if (RHSType->isExtVectorType())
8331 return Incompatible;
8332 if (RHSType->isArithmeticType()) {
8333 // CK_VectorSplat does T -> vector T, so first cast to the element type.
8334 if (ConvertRHS)
8335 RHS = prepareVectorSplat(LHSType, RHS.get());
8336 Kind = CK_VectorSplat;
8337 return Compatible;
8338 }
8339 }
8340
8341 // Conversions to or from vector type.
8342 if (LHSType->isVectorType() || RHSType->isVectorType()) {
8343 if (LHSType->isVectorType() && RHSType->isVectorType()) {
8344 // Allow assignments of an AltiVec vector type to an equivalent GCC
8345 // vector type and vice versa
8346 if (Context.areCompatibleVectorTypes(LHSType, RHSType)) {
8347 Kind = CK_BitCast;
8348 return Compatible;
8349 }
8350
8351 // If we are allowing lax vector conversions, and LHS and RHS are both
8352 // vectors, the total size only needs to be the same. This is a bitcast;
8353 // no bits are changed but the result type is different.
8354 if (isLaxVectorConversion(RHSType, LHSType)) {
8355 Kind = CK_BitCast;
8356 return IncompatibleVectors;
8357 }
8358 }
8359
8360 // When the RHS comes from another lax conversion (e.g. binops between
8361 // scalars and vectors) the result is canonicalized as a vector. When the
8362 // LHS is also a vector, the lax is allowed by the condition above. Handle
8363 // the case where LHS is a scalar.
8364 if (LHSType->isScalarType()) {
8365 const VectorType *VecType = RHSType->getAs<VectorType>();
8366 if (VecType && VecType->getNumElements() == 1 &&
8367 isLaxVectorConversion(RHSType, LHSType)) {
8368 ExprResult *VecExpr = &RHS;
8369 *VecExpr = ImpCastExprToType(VecExpr->get(), LHSType, CK_BitCast);
8370 Kind = CK_BitCast;
8371 return Compatible;
8372 }
8373 }
8374
8375 return Incompatible;
8376 }
8377
8378 // Diagnose attempts to convert between __float128 and long double where
8379 // such conversions currently can't be handled.
8380 if (unsupportedTypeConversion(*this, LHSType, RHSType))
8381 return Incompatible;
8382
8383 // Disallow assigning a _Complex to a real type in C++ mode since it simply
8384 // discards the imaginary part.
8385 if (getLangOpts().CPlusPlus && RHSType->getAs<ComplexType>() &&
8386 !LHSType->getAs<ComplexType>())
8387 return Incompatible;
8388
8389 // Arithmetic conversions.
8390 if (LHSType->isArithmeticType() && RHSType->isArithmeticType() &&
8391 !(getLangOpts().CPlusPlus && LHSType->isEnumeralType())) {
8392 if (ConvertRHS)
8393 Kind = PrepareScalarCast(RHS, LHSType);
8394 return Compatible;
8395 }
8396
8397 // Conversions to normal pointers.
8398 if (const PointerType *LHSPointer = dyn_cast<PointerType>(LHSType)) {
8399 // U* -> T*
8400 if (isa<PointerType>(RHSType)) {
8401 LangAS AddrSpaceL = LHSPointer->getPointeeType().getAddressSpace();
8402 LangAS AddrSpaceR = RHSType->getPointeeType().getAddressSpace();
8403 if (AddrSpaceL != AddrSpaceR)
8404 Kind = CK_AddressSpaceConversion;
8405 else if (Context.hasCvrSimilarType(RHSType, LHSType))
8406 Kind = CK_NoOp;
8407 else
8408 Kind = CK_BitCast;
8409 return checkPointerTypesForAssignment(*this, LHSType, RHSType);
8410 }
8411
8412 // int -> T*
8413 if (RHSType->isIntegerType()) {
8414 Kind = CK_IntegralToPointer; // FIXME: null?
8415 return IntToPointer;
8416 }
8417
8418 // C pointers are not compatible with ObjC object pointers,
8419 // with two exceptions:
8420 if (isa<ObjCObjectPointerType>(RHSType)) {
8421 // - conversions to void*
8422 if (LHSPointer->getPointeeType()->isVoidType()) {
8423 Kind = CK_BitCast;
8424 return Compatible;
8425 }
8426
8427 // - conversions from 'Class' to the redefinition type
8428 if (RHSType->isObjCClassType() &&
8429 Context.hasSameType(LHSType,
8430 Context.getObjCClassRedefinitionType())) {
8431 Kind = CK_BitCast;
8432 return Compatible;
8433 }
8434
8435 Kind = CK_BitCast;
8436 return IncompatiblePointer;
8437 }
8438
8439 // U^ -> void*
8440 if (RHSType->getAs<BlockPointerType>()) {
8441 if (LHSPointer->getPointeeType()->isVoidType()) {
8442 LangAS AddrSpaceL = LHSPointer->getPointeeType().getAddressSpace();
8443 LangAS AddrSpaceR = RHSType->getAs<BlockPointerType>()
8444 ->getPointeeType()
8445 .getAddressSpace();
8446 Kind =
8447 AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
8448 return Compatible;
8449 }
8450 }
8451
8452 return Incompatible;
8453 }
8454
8455 // Conversions to block pointers.
8456 if (isa<BlockPointerType>(LHSType)) {
8457 // U^ -> T^
8458 if (RHSType->isBlockPointerType()) {
8459 LangAS AddrSpaceL = LHSType->getAs<BlockPointerType>()
8460 ->getPointeeType()
8461 .getAddressSpace();
8462 LangAS AddrSpaceR = RHSType->getAs<BlockPointerType>()
8463 ->getPointeeType()
8464 .getAddressSpace();
8465 Kind = AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion : CK_BitCast;
8466 return checkBlockPointerTypesForAssignment(*this, LHSType, RHSType);
8467 }
8468
8469 // int or null -> T^
8470 if (RHSType->isIntegerType()) {
8471 Kind = CK_IntegralToPointer; // FIXME: null
8472 return IntToBlockPointer;
8473 }
8474
8475 // id -> T^
8476 if (getLangOpts().ObjC && RHSType->isObjCIdType()) {
8477 Kind = CK_AnyPointerToBlockPointerCast;
8478 return Compatible;
8479 }
8480
8481 // void* -> T^
8482 if (const PointerType *RHSPT = RHSType->getAs<PointerType>())
8483 if (RHSPT->getPointeeType()->isVoidType()) {
8484 Kind = CK_AnyPointerToBlockPointerCast;
8485 return Compatible;
8486 }
8487
8488 return Incompatible;
8489 }
8490
8491 // Conversions to Objective-C pointers.
8492 if (isa<ObjCObjectPointerType>(LHSType)) {
8493 // A* -> B*
8494 if (RHSType->isObjCObjectPointerType()) {
8495 Kind = CK_BitCast;
8496 Sema::AssignConvertType result =
8497 checkObjCPointerTypesForAssignment(*this, LHSType, RHSType);
8498 if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
8499 result == Compatible &&
8500 !CheckObjCARCUnavailableWeakConversion(OrigLHSType, RHSType))
8501 result = IncompatibleObjCWeakRef;
8502 return result;
8503 }
8504
8505 // int or null -> A*
8506 if (RHSType->isIntegerType()) {
8507 Kind = CK_IntegralToPointer; // FIXME: null
8508 return IntToPointer;
8509 }
8510
8511 // In general, C pointers are not compatible with ObjC object pointers,
8512 // with two exceptions:
8513 if (isa<PointerType>(RHSType)) {
8514 Kind = CK_CPointerToObjCPointerCast;
8515
8516 // - conversions from 'void*'
8517 if (RHSType->isVoidPointerType()) {
8518 return Compatible;
8519 }
8520
8521 // - conversions to 'Class' from its redefinition type
8522 if (LHSType->isObjCClassType() &&
8523 Context.hasSameType(RHSType,
8524 Context.getObjCClassRedefinitionType())) {
8525 return Compatible;
8526 }
8527
8528 return IncompatiblePointer;
8529 }
8530
8531 // Only under strict condition T^ is compatible with an Objective-C pointer.
8532 if (RHSType->isBlockPointerType() &&
8533 LHSType->isBlockCompatibleObjCPointerType(Context)) {
8534 if (ConvertRHS)
8535 maybeExtendBlockObject(RHS);
8536 Kind = CK_BlockPointerToObjCPointerCast;
8537 return Compatible;
8538 }
8539
8540 return Incompatible;
8541 }
8542
8543 // Conversions from pointers that are not covered by the above.
8544 if (isa<PointerType>(RHSType)) {
8545 // T* -> _Bool
8546 if (LHSType == Context.BoolTy) {
8547 Kind = CK_PointerToBoolean;
8548 return Compatible;
8549 }
8550
8551 // T* -> int
8552 if (LHSType->isIntegerType()) {
8553 Kind = CK_PointerToIntegral;
8554 return PointerToInt;
8555 }
8556
8557 return Incompatible;
8558 }
8559
8560 // Conversions from Objective-C pointers that are not covered by the above.
8561 if (isa<ObjCObjectPointerType>(RHSType)) {
8562 // T* -> _Bool
8563 if (LHSType == Context.BoolTy) {
8564 Kind = CK_PointerToBoolean;
8565 return Compatible;
8566 }
8567
8568 // T* -> int
8569 if (LHSType->isIntegerType()) {
8570 Kind = CK_PointerToIntegral;
8571 return PointerToInt;
8572 }
8573
8574 return Incompatible;
8575 }
8576
8577 // struct A -> struct B
8578 if (isa<TagType>(LHSType) && isa<TagType>(RHSType)) {
8579 if (Context.typesAreCompatible(LHSType, RHSType)) {
8580 Kind = CK_NoOp;
8581 return Compatible;
8582 }
8583 }
8584
8585 if (LHSType->isSamplerT() && RHSType->isIntegerType()) {
8586 Kind = CK_IntToOCLSampler;
8587 return Compatible;
8588 }
8589
8590 return Incompatible;
8591 }
8592
8593 /// Constructs a transparent union from an expression that is
8594 /// used to initialize the transparent union.
8595 static void ConstructTransparentUnion(Sema &S, ASTContext &C,
8596 ExprResult &EResult, QualType UnionType,
8597 FieldDecl *Field) {
8598 // Build an initializer list that designates the appropriate member
8599 // of the transparent union.
8600 Expr *E = EResult.get();
8601 InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
8602 E, SourceLocation());
8603 Initializer->setType(UnionType);
8604 Initializer->setInitializedFieldInUnion(Field);
8605
8606 // Build a compound literal constructing a value of the transparent
8607 // union type from this initializer list.
8608 TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
8609 EResult = new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
8610 VK_RValue, Initializer, false);
8611 }
8612
8613 Sema::AssignConvertType
8614 Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType,
8615 ExprResult &RHS) {
8616 QualType RHSType = RHS.get()->getType();
8617
8618 // If the ArgType is a Union type, we want to handle a potential
8619 // transparent_union GCC extension.
8620 const RecordType *UT = ArgType->getAsUnionType();
8621 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
8622 return Incompatible;
8623
8624 // The field to initialize within the transparent union.
8625 RecordDecl *UD = UT->getDecl();
8626 FieldDecl *InitField = nullptr;
8627 // It's compatible if the expression matches any of the fields.
8628 for (auto *it : UD->fields()) {
8629 if (it->getType()->isPointerType()) {
8630 // If the transparent union contains a pointer type, we allow:
8631 // 1) void pointer
8632 // 2) null pointer constant
8633 if (RHSType->isPointerType())
8634 if (RHSType->castAs<PointerType>()->getPointeeType()->isVoidType()) {
8635 RHS = ImpCastExprToType(RHS.get(), it->getType(), CK_BitCast);
8636 InitField = it;
8637 break;
8638 }
8639
8640 if (RHS.get()->isNullPointerConstant(Context,
8641 Expr::NPC_ValueDependentIsNull)) {
8642 RHS = ImpCastExprToType(RHS.get(), it->getType(),
8643 CK_NullToPointer);
8644 InitField = it;
8645 break;
8646 }
8647 }
8648
8649 CastKind Kind;
8650 if (CheckAssignmentConstraints(it->getType(), RHS, Kind)
8651 == Compatible) {
8652 RHS = ImpCastExprToType(RHS.get(), it->getType(), Kind);
8653 InitField = it;
8654 break;
8655 }
8656 }
8657
8658 if (!InitField)
8659 return Incompatible;
8660
8661 ConstructTransparentUnion(*this, Context, RHS, ArgType, InitField);
8662 return Compatible;
8663 }
8664
8665 Sema::AssignConvertType
8666 Sema::CheckSingleAssignmentConstraints(QualType LHSType, ExprResult &CallerRHS,
8667 bool Diagnose,
8668 bool DiagnoseCFAudited,
8669 bool ConvertRHS) {
8670 // We need to be able to tell the caller whether we diagnosed a problem, if
8671 // they ask us to issue diagnostics.
8672 assert((ConvertRHS || !Diagnose) && "can't indicate whether we diagnosed");
8673
8674 // If ConvertRHS is false, we want to leave the caller's RHS untouched. Sadly,
8675 // we can't avoid *all* modifications at the moment, so we need some somewhere
8676 // to put the updated value.
8677 ExprResult LocalRHS = CallerRHS;
8678 ExprResult &RHS = ConvertRHS ? CallerRHS : LocalRHS;
8679
8680 if (const auto *LHSPtrType = LHSType->getAs<PointerType>()) {
8681 if (const auto *RHSPtrType = RHS.get()->getType()->getAs<PointerType>()) {
8682 if (RHSPtrType->getPointeeType()->hasAttr(attr::NoDeref) &&
8683 !LHSPtrType->getPointeeType()->hasAttr(attr::NoDeref)) {
8684 Diag(RHS.get()->getExprLoc(),
8685 diag::warn_noderef_to_dereferenceable_pointer)
8686 << RHS.get()->getSourceRange();
8687 }
8688 }
8689 }
8690
8691 if (getLangOpts().CPlusPlus) {
8692 if (!LHSType->isRecordType() && !LHSType->isAtomicType()) {
8693 // C++ 5.17p3: If the left operand is not of class type, the
8694 // expression is implicitly converted (C++ 4) to the
8695 // cv-unqualified type of the left operand.
8696 QualType RHSType = RHS.get()->getType();
8697 if (Diagnose) {
8698 RHS = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
8699 AA_Assigning);
8700 } else {
8701 ImplicitConversionSequence ICS =
8702 TryImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
8703 /*SuppressUserConversions=*/false,
8704 /*AllowExplicit=*/false,
8705 /*InOverloadResolution=*/false,
8706 /*CStyle=*/false,
8707 /*AllowObjCWritebackConversion=*/false);
8708 if (ICS.isFailure())
8709 return Incompatible;
8710 RHS = PerformImplicitConversion(RHS.get(), LHSType.getUnqualifiedType(),
8711 ICS, AA_Assigning);
8712 }
8713 if (RHS.isInvalid())
8714 return Incompatible;
8715 Sema::AssignConvertType result = Compatible;
8716 if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
8717 !CheckObjCARCUnavailableWeakConversion(LHSType, RHSType))
8718 result = IncompatibleObjCWeakRef;
8719 return result;
8720 }
8721
8722 // FIXME: Currently, we fall through and treat C++ classes like C
8723 // structures.
8724 // FIXME: We also fall through for atomics; not sure what should
8725 // happen there, though.
8726 } else if (RHS.get()->getType() == Context.OverloadTy) {
8727 // As a set of extensions to C, we support overloading on functions. These
8728 // functions need to be resolved here.
8729 DeclAccessPair DAP;
8730 if (FunctionDecl *FD = ResolveAddressOfOverloadedFunction(
8731 RHS.get(), LHSType, /*Complain=*/false, DAP))
8732 RHS = FixOverloadedFunctionReference(RHS.get(), DAP, FD);
8733 else
8734 return Incompatible;
8735 }
8736
8737 // C99 6.5.16.1p1: the left operand is a pointer and the right is
8738 // a null pointer constant.
8739 if ((LHSType->isPointerType() || LHSType->isObjCObjectPointerType() ||
8740 LHSType->isBlockPointerType()) &&
8741 RHS.get()->isNullPointerConstant(Context,
8742 Expr::NPC_ValueDependentIsNull)) {
8743 if (Diagnose || ConvertRHS) {
8744 CastKind Kind;
8745 CXXCastPath Path;
8746 CheckPointerConversion(RHS.get(), LHSType, Kind, Path,
8747 /*IgnoreBaseAccess=*/false, Diagnose);
8748 if (ConvertRHS)
8749 RHS = ImpCastExprToType(RHS.get(), LHSType, Kind, VK_RValue, &Path);
8750 }
8751 return Compatible;
8752 }
8753
8754 // OpenCL queue_t type assignment.
8755 if (LHSType->isQueueT() && RHS.get()->isNullPointerConstant(
8756 Context, Expr::NPC_ValueDependentIsNull)) {
8757 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
8758 return Compatible;
8759 }
8760
8761 // This check seems unnatural, however it is necessary to ensure the proper
8762 // conversion of functions/arrays. If the conversion were done for all
8763 // DeclExpr's (created by ActOnIdExpression), it would mess up the unary
8764 // expressions that suppress this implicit conversion (&, sizeof).
8765 //
8766 // Suppress this for references: C++ 8.5.3p5.
8767 if (!LHSType->isReferenceType()) {
8768 // FIXME: We potentially allocate here even if ConvertRHS is false.
8769 RHS = DefaultFunctionArrayLvalueConversion(RHS.get(), Diagnose);
8770 if (RHS.isInvalid())
8771 return Incompatible;
8772 }
8773 CastKind Kind;
8774 Sema::AssignConvertType result =
8775 CheckAssignmentConstraints(LHSType, RHS, Kind, ConvertRHS);
8776
8777 // C99 6.5.16.1p2: The value of the right operand is converted to the
8778 // type of the assignment expression.
8779 // CheckAssignmentConstraints allows the left-hand side to be a reference,
8780 // so that we can use references in built-in functions even in C.
8781 // The getNonReferenceType() call makes sure that the resulting expression
8782 // does not have reference type.
8783 if (result != Incompatible && RHS.get()->getType() != LHSType) {
8784 QualType Ty = LHSType.getNonLValueExprType(Context);
8785 Expr *E = RHS.get();
8786
8787 // Check for various Objective-C errors. If we are not reporting
8788 // diagnostics and just checking for errors, e.g., during overload
8789 // resolution, return Incompatible to indicate the failure.
8790 if (getLangOpts().allowsNonTrivialObjCLifetimeQualifiers() &&
8791 CheckObjCConversion(SourceRange(), Ty, E, CCK_ImplicitConversion,
8792 Diagnose, DiagnoseCFAudited) != ACR_okay) {
8793 if (!Diagnose)
8794 return Incompatible;
8795 }
8796 if (getLangOpts().ObjC &&
8797 (CheckObjCBridgeRelatedConversions(E->getBeginLoc(), LHSType,
8798 E->getType(), E, Diagnose) ||
8799 ConversionToObjCStringLiteralCheck(LHSType, E, Diagnose))) {
8800 if (!Diagnose)
8801 return Incompatible;
8802 // Replace the expression with a corrected version and continue so we
8803 // can find further errors.
8804 RHS = E;
8805 return Compatible;
8806 }
8807
8808 if (ConvertRHS)
8809 RHS = ImpCastExprToType(E, Ty, Kind);
8810 }
8811
8812 return result;
8813 }
8814
8815 namespace {
8816 /// The original operand to an operator, prior to the application of the usual
8817 /// arithmetic conversions and converting the arguments of a builtin operator
8818 /// candidate.
8819 struct OriginalOperand {
8820 explicit OriginalOperand(Expr *Op) : Orig(Op), Conversion(nullptr) {
8821 if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Op))
8822 Op = MTE->getSubExpr();
8823 if (auto *BTE = dyn_cast<CXXBindTemporaryExpr>(Op))
8824 Op = BTE->getSubExpr();
8825 if (auto *ICE = dyn_cast<ImplicitCastExpr>(Op)) {
8826 Orig = ICE->getSubExprAsWritten();
8827 Conversion = ICE->getConversionFunction();
8828 }
8829 }
8830
8831 QualType getType() const { return Orig->getType(); }
8832
8833 Expr *Orig;
8834 NamedDecl *Conversion;
8835 };
8836 }
8837
8838 QualType Sema::InvalidOperands(SourceLocation Loc, ExprResult &LHS,
8839 ExprResult &RHS) {
8840 OriginalOperand OrigLHS(LHS.get()), OrigRHS(RHS.get());
8841
8842 Diag(Loc, diag::err_typecheck_invalid_operands)
8843 << OrigLHS.getType() << OrigRHS.getType()
8844 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
8845
8846 // If a user-defined conversion was applied to either of the operands prior
8847 // to applying the built-in operator rules, tell the user about it.
8848 if (OrigLHS.Conversion) {
8849 Diag(OrigLHS.Conversion->getLocation(),
8850 diag::note_typecheck_invalid_operands_converted)
8851 << 0 << LHS.get()->getType();
8852 }
8853 if (OrigRHS.Conversion) {
8854 Diag(OrigRHS.Conversion->getLocation(),
8855 diag::note_typecheck_invalid_operands_converted)
8856 << 1 << RHS.get()->getType();
8857 }
8858
8859 return QualType();
8860 }
8861
8862 // Diagnose cases where a scalar was implicitly converted to a vector and
8863 // diagnose the underlying types. Otherwise, diagnose the error
8864 // as invalid vector logical operands for non-C++ cases.
8865 QualType Sema::InvalidLogicalVectorOperands(SourceLocation Loc, ExprResult &LHS,
8866 ExprResult &RHS) {
8867 QualType LHSType = LHS.get()->IgnoreImpCasts()->getType();
8868 QualType RHSType = RHS.get()->IgnoreImpCasts()->getType();
8869
8870 bool LHSNatVec = LHSType->isVectorType();
8871 bool RHSNatVec = RHSType->isVectorType();
8872
8873 if (!(LHSNatVec && RHSNatVec)) {
8874 Expr *Vector = LHSNatVec ? LHS.get() : RHS.get();
8875 Expr *NonVector = !LHSNatVec ? LHS.get() : RHS.get();
8876 Diag(Loc, diag::err_typecheck_logical_vector_expr_gnu_cpp_restrict)
8877 << 0 << Vector->getType() << NonVector->IgnoreImpCasts()->getType()
8878 << Vector->getSourceRange();
8879 return QualType();
8880 }
8881
8882 Diag(Loc, diag::err_typecheck_logical_vector_expr_gnu_cpp_restrict)
8883 << 1 << LHSType << RHSType << LHS.get()->getSourceRange()
8884 << RHS.get()->getSourceRange();
8885
8886 return QualType();
8887 }
8888
8889 /// Try to convert a value of non-vector type to a vector type by converting
8890 /// the type to the element type of the vector and then performing a splat.
8891 /// If the language is OpenCL, we only use conversions that promote scalar
8892 /// rank; for C, Obj-C, and C++ we allow any real scalar conversion except
8893 /// for float->int.
8894 ///
8895 /// OpenCL V2.0 6.2.6.p2:
8896 /// An error shall occur if any scalar operand type has greater rank
8897 /// than the type of the vector element.
8898 ///
8899 /// \param scalar - if non-null, actually perform the conversions
8900 /// \return true if the operation fails (but without diagnosing the failure)
8901 static bool tryVectorConvertAndSplat(Sema &S, ExprResult *scalar,
8902 QualType scalarTy,
8903 QualType vectorEltTy,
8904 QualType vectorTy,
8905 unsigned &DiagID) {
8906 // The conversion to apply to the scalar before splatting it,
8907 // if necessary.
8908 CastKind scalarCast = CK_NoOp;
8909
8910 if (vectorEltTy->isIntegralType(S.Context)) {
8911 if (S.getLangOpts().OpenCL && (scalarTy->isRealFloatingType() ||
8912 (scalarTy->isIntegerType() &&
8913 S.Context.getIntegerTypeOrder(vectorEltTy, scalarTy) < 0))) {
8914 DiagID = diag::err_opencl_scalar_type_rank_greater_than_vector_type;
8915 return true;
8916 }
8917 if (!scalarTy->isIntegralType(S.Context))
8918 return true;
8919 scalarCast = CK_IntegralCast;
8920 } else if (vectorEltTy->isRealFloatingType()) {
8921 if (scalarTy->isRealFloatingType()) {
8922 if (S.getLangOpts().OpenCL &&
8923 S.Context.getFloatingTypeOrder(vectorEltTy, scalarTy) < 0) {
8924 DiagID = diag::err_opencl_scalar_type_rank_greater_than_vector_type;
8925 return true;
8926 }
8927 scalarCast = CK_FloatingCast;
8928 }
8929 else if (scalarTy->isIntegralType(S.Context))
8930 scalarCast = CK_IntegralToFloating;
8931 else
8932 return true;
8933 } else {
8934 return true;
8935 }
8936
8937 // Adjust scalar if desired.
8938 if (scalar) {
8939 if (scalarCast != CK_NoOp)
8940 *scalar = S.ImpCastExprToType(scalar->get(), vectorEltTy, scalarCast);
8941 *scalar = S.ImpCastExprToType(scalar->get(), vectorTy, CK_VectorSplat);
8942 }
8943 return false;
8944 }
8945
8946 /// Convert vector E to a vector with the same number of elements but different
8947 /// element type.
8948 static ExprResult convertVector(Expr *E, QualType ElementType, Sema &S) {
8949 const auto *VecTy = E->getType()->getAs<VectorType>();
8950 assert(VecTy && "Expression E must be a vector");
8951 QualType NewVecTy = S.Context.getVectorType(ElementType,
8952 VecTy->getNumElements(),
8953 VecTy->getVectorKind());
8954
8955 // Look through the implicit cast. Return the subexpression if its type is
8956 // NewVecTy.
8957 if (auto *ICE = dyn_cast<ImplicitCastExpr>(E))
8958 if (ICE->getSubExpr()->getType() == NewVecTy)
8959 return ICE->getSubExpr();
8960
8961 auto Cast = ElementType->isIntegerType() ? CK_IntegralCast : CK_FloatingCast;
8962 return S.ImpCastExprToType(E, NewVecTy, Cast);
8963 }
8964
8965 /// Test if a (constant) integer Int can be casted to another integer type
8966 /// IntTy without losing precision.
8967 static bool canConvertIntToOtherIntTy(Sema &S, ExprResult *Int,
8968 QualType OtherIntTy) {
8969 QualType IntTy = Int->get()->getType().getUnqualifiedType();
8970
8971 // Reject cases where the value of the Int is unknown as that would
8972 // possibly cause truncation, but accept cases where the scalar can be
8973 // demoted without loss of precision.
8974 Expr::EvalResult EVResult;
8975 bool CstInt = Int->get()->EvaluateAsInt(EVResult, S.Context);
8976 int Order = S.Context.getIntegerTypeOrder(OtherIntTy, IntTy);
8977 bool IntSigned = IntTy->hasSignedIntegerRepresentation();
8978 bool OtherIntSigned = OtherIntTy->hasSignedIntegerRepresentation();
8979
8980 if (CstInt) {
8981 // If the scalar is constant and is of a higher order and has more active
8982 // bits that the vector element type, reject it.
8983 llvm::APSInt Result = EVResult.Val.getInt();
8984 unsigned NumBits = IntSigned
8985 ? (Result.isNegative() ? Result.getMinSignedBits()
8986 : Result.getActiveBits())
8987 : Result.getActiveBits();
8988 if (Order < 0 && S.Context.getIntWidth(OtherIntTy) < NumBits)
8989 return true;
8990
8991 // If the signedness of the scalar type and the vector element type
8992 // differs and the number of bits is greater than that of the vector
8993 // element reject it.
8994 return (IntSigned != OtherIntSigned &&
8995 NumBits > S.Context.getIntWidth(OtherIntTy));
8996 }
8997
8998 // Reject cases where the value of the scalar is not constant and it's
8999 // order is greater than that of the vector element type.
9000 return (Order < 0);
9001 }
9002
9003 /// Test if a (constant) integer Int can be casted to floating point type
9004 /// FloatTy without losing precision.
9005 static bool canConvertIntTyToFloatTy(Sema &S, ExprResult *Int,
9006 QualType FloatTy) {
9007 QualType IntTy = Int->get()->getType().getUnqualifiedType();
9008
9009 // Determine if the integer constant can be expressed as a floating point
9010 // number of the appropriate type.
9011 Expr::EvalResult EVResult;
9012 bool CstInt = Int->get()->EvaluateAsInt(EVResult, S.Context);
9013
9014 uint64_t Bits = 0;
9015 if (CstInt) {
9016 // Reject constants that would be truncated if they were converted to
9017 // the floating point type. Test by simple to/from conversion.
9018 // FIXME: Ideally the conversion to an APFloat and from an APFloat
9019 // could be avoided if there was a convertFromAPInt method
9020 // which could signal back if implicit truncation occurred.
9021 llvm::APSInt Result = EVResult.Val.getInt();
9022 llvm::APFloat Float(S.Context.getFloatTypeSemantics(FloatTy));
9023 Float.convertFromAPInt(Result, IntTy->hasSignedIntegerRepresentation(),
9024 llvm::APFloat::rmTowardZero);
9025 llvm::APSInt ConvertBack(S.Context.getIntWidth(IntTy),
9026 !IntTy->hasSignedIntegerRepresentation());
9027 bool Ignored = false;
9028 Float.convertToInteger(ConvertBack, llvm::APFloat::rmNearestTiesToEven,
9029 &Ignored);
9030 if (Result != ConvertBack)
9031 return true;
9032 } else {
9033 // Reject types that cannot be fully encoded into the mantissa of
9034 // the float.
9035 Bits = S.Context.getTypeSize(IntTy);
9036 unsigned FloatPrec = llvm::APFloat::semanticsPrecision(
9037 S.Context.getFloatTypeSemantics(FloatTy));
9038 if (Bits > FloatPrec)
9039 return true;
9040 }
9041
9042 return false;
9043 }
9044
9045 /// Attempt to convert and splat Scalar into a vector whose types matches
9046 /// Vector following GCC conversion rules. The rule is that implicit
9047 /// conversion can occur when Scalar can be casted to match Vector's element
9048 /// type without causing truncation of Scalar.
9049 static bool tryGCCVectorConvertAndSplat(Sema &S, ExprResult *Scalar,
9050 ExprResult *Vector) {
9051 QualType ScalarTy = Scalar->get()->getType().getUnqualifiedType();
9052 QualType VectorTy = Vector->get()->getType().getUnqualifiedType();
9053 const VectorType *VT = VectorTy->getAs<VectorType>();
9054
9055 assert(!isa<ExtVectorType>(VT) &&
9056 "ExtVectorTypes should not be handled here!");
9057
9058 QualType VectorEltTy = VT->getElementType();
9059
9060 // Reject cases where the vector element type or the scalar element type are
9061 // not integral or floating point types.
9062 if (!VectorEltTy->isArithmeticType() || !ScalarTy->isArithmeticType())
9063 return true;
9064
9065 // The conversion to apply to the scalar before splatting it,
9066 // if necessary.
9067 CastKind ScalarCast = CK_NoOp;
9068
9069 // Accept cases where the vector elements are integers and the scalar is
9070 // an integer.
9071 // FIXME: Notionally if the scalar was a floating point value with a precise
9072 // integral representation, we could cast it to an appropriate integer
9073 // type and then perform the rest of the checks here. GCC will perform
9074 // this conversion in some cases as determined by the input language.
9075 // We should accept it on a language independent basis.
9076 if (VectorEltTy->isIntegralType(S.Context) &&
9077 ScalarTy->isIntegralType(S.Context) &&
9078 S.Context.getIntegerTypeOrder(VectorEltTy, ScalarTy)) {
9079
9080 if (canConvertIntToOtherIntTy(S, Scalar, VectorEltTy))
9081 return true;
9082
9083 ScalarCast = CK_IntegralCast;
9084 } else if (VectorEltTy->isIntegralType(S.Context) &&
9085 ScalarTy->isRealFloatingType()) {
9086 if (S.Context.getTypeSize(VectorEltTy) == S.Context.getTypeSize(ScalarTy))
9087 ScalarCast = CK_FloatingToIntegral;
9088 else
9089 return true;
9090 } else if (VectorEltTy->isRealFloatingType()) {
9091 if (ScalarTy->isRealFloatingType()) {
9092
9093 // Reject cases where the scalar type is not a constant and has a higher
9094 // Order than the vector element type.
9095 llvm::APFloat Result(0.0);
9096 bool CstScalar = Scalar->get()->EvaluateAsFloat(Result, S.Context);
9097 int Order = S.Context.getFloatingTypeOrder(VectorEltTy, ScalarTy);
9098 if (!CstScalar && Order < 0)
9099 return true;
9100
9101 // If the scalar cannot be safely casted to the vector element type,
9102 // reject it.
9103 if (CstScalar) {
9104 bool Truncated = false;
9105 Result.convert(S.Context.getFloatTypeSemantics(VectorEltTy),
9106 llvm::APFloat::rmNearestTiesToEven, &Truncated);
9107 if (Truncated)
9108 return true;
9109 }
9110
9111 ScalarCast = CK_FloatingCast;
9112 } else if (ScalarTy->isIntegralType(S.Context)) {
9113 if (canConvertIntTyToFloatTy(S, Scalar, VectorEltTy))
9114 return true;
9115
9116 ScalarCast = CK_IntegralToFloating;
9117 } else
9118 return true;
9119 }
9120
9121 // Adjust scalar if desired.
9122 if (Scalar) {
9123 if (ScalarCast != CK_NoOp)
9124 *Scalar = S.ImpCastExprToType(Scalar->get(), VectorEltTy, ScalarCast);
9125 *Scalar = S.ImpCastExprToType(Scalar->get(), VectorTy, CK_VectorSplat);
9126 }
9127 return false;
9128 }
9129
9130 QualType Sema::CheckVectorOperands(ExprResult &LHS, ExprResult &RHS,
9131 SourceLocation Loc, bool IsCompAssign,
9132 bool AllowBothBool,
9133 bool AllowBoolConversions) {
9134 if (!IsCompAssign) {
9135 LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
9136 if (LHS.isInvalid())
9137 return QualType();
9138 }
9139 RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
9140 if (RHS.isInvalid())
9141 return QualType();
9142
9143 // For conversion purposes, we ignore any qualifiers.
9144 // For example, "const float" and "float" are equivalent.
9145 QualType LHSType = LHS.get()->getType().getUnqualifiedType();
9146 QualType RHSType = RHS.get()->getType().getUnqualifiedType();
9147
9148 const VectorType *LHSVecType = LHSType->getAs<VectorType>();
9149 const VectorType *RHSVecType = RHSType->getAs<VectorType>();
9150 assert(LHSVecType || RHSVecType);
9151
9152 // AltiVec-style "vector bool op vector bool" combinations are allowed
9153 // for some operators but not others.
9154 if (!AllowBothBool &&
9155 LHSVecType && LHSVecType->getVectorKind() == VectorType::AltiVecBool &&
9156 RHSVecType && RHSVecType->getVectorKind() == VectorType::AltiVecBool)
9157 return InvalidOperands(Loc, LHS, RHS);
9158
9159 // If the vector types are identical, return.
9160 if (Context.hasSameType(LHSType, RHSType))
9161 return LHSType;
9162
9163 // If we have compatible AltiVec and GCC vector types, use the AltiVec type.
9164 if (LHSVecType && RHSVecType &&
9165 Context.areCompatibleVectorTypes(LHSType, RHSType)) {
9166 if (isa<ExtVectorType>(LHSVecType)) {
9167 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
9168 return LHSType;
9169 }
9170
9171 if (!IsCompAssign)
9172 LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
9173 return RHSType;
9174 }
9175
9176 // AllowBoolConversions says that bool and non-bool AltiVec vectors
9177 // can be mixed, with the result being the non-bool type. The non-bool
9178 // operand must have integer element type.
9179 if (AllowBoolConversions && LHSVecType && RHSVecType &&
9180 LHSVecType->getNumElements() == RHSVecType->getNumElements() &&
9181 (Context.getTypeSize(LHSVecType->getElementType()) ==
9182 Context.getTypeSize(RHSVecType->getElementType()))) {
9183 if (LHSVecType->getVectorKind() == VectorType::AltiVecVector &&
9184 LHSVecType->getElementType()->isIntegerType() &&
9185 RHSVecType->getVectorKind() == VectorType::AltiVecBool) {
9186 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
9187 return LHSType;
9188 }
9189 if (!IsCompAssign &&
9190 LHSVecType->getVectorKind() == VectorType::AltiVecBool &&
9191 RHSVecType->getVectorKind() == VectorType::AltiVecVector &&
9192 RHSVecType->getElementType()->isIntegerType()) {
9193 LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
9194 return RHSType;
9195 }
9196 }
9197
9198 // If there's a vector type and a scalar, try to convert the scalar to
9199 // the vector element type and splat.
9200 unsigned DiagID = diag::err_typecheck_vector_not_convertable;
9201 if (!RHSVecType) {
9202 if (isa<ExtVectorType>(LHSVecType)) {
9203 if (!tryVectorConvertAndSplat(*this, &RHS, RHSType,
9204 LHSVecType->getElementType(), LHSType,
9205 DiagID))
9206 return LHSType;
9207 } else {
9208 if (!tryGCCVectorConvertAndSplat(*this, &RHS, &LHS))
9209 return LHSType;
9210 }
9211 }
9212 if (!LHSVecType) {
9213 if (isa<ExtVectorType>(RHSVecType)) {
9214 if (!tryVectorConvertAndSplat(*this, (IsCompAssign ? nullptr : &LHS),
9215 LHSType, RHSVecType->getElementType(),
9216 RHSType, DiagID))
9217 return RHSType;
9218 } else {
9219 if (LHS.get()->getValueKind() == VK_LValue ||
9220 !tryGCCVectorConvertAndSplat(*this, &LHS, &RHS))
9221 return RHSType;
9222 }
9223 }
9224
9225 // FIXME: The code below also handles conversion between vectors and
9226 // non-scalars, we should break this down into fine grained specific checks
9227 // and emit proper diagnostics.
9228 QualType VecType = LHSVecType ? LHSType : RHSType;
9229 const VectorType *VT = LHSVecType ? LHSVecType : RHSVecType;
9230 QualType OtherType = LHSVecType ? RHSType : LHSType;
9231 ExprResult *OtherExpr = LHSVecType ? &RHS : &LHS;
9232 if (isLaxVectorConversion(OtherType, VecType)) {
9233 // If we're allowing lax vector conversions, only the total (data) size
9234 // needs to be the same. For non compound assignment, if one of the types is
9235 // scalar, the result is always the vector type.
9236 if (!IsCompAssign) {
9237 *OtherExpr = ImpCastExprToType(OtherExpr->get(), VecType, CK_BitCast);
9238 return VecType;
9239 // In a compound assignment, lhs += rhs, 'lhs' is a lvalue src, forbidding
9240 // any implicit cast. Here, the 'rhs' should be implicit casted to 'lhs'
9241 // type. Note that this is already done by non-compound assignments in
9242 // CheckAssignmentConstraints. If it's a scalar type, only bitcast for
9243 // <1 x T> -> T. The result is also a vector type.
9244 } else if (OtherType->isExtVectorType() || OtherType->isVectorType() ||
9245 (OtherType->isScalarType() && VT->getNumElements() == 1)) {
9246 ExprResult *RHSExpr = &RHS;
9247 *RHSExpr = ImpCastExprToType(RHSExpr->get(), LHSType, CK_BitCast);
9248 return VecType;
9249 }
9250 }
9251
9252 // Okay, the expression is invalid.
9253
9254 // If there's a non-vector, non-real operand, diagnose that.
9255 if ((!RHSVecType && !RHSType->isRealType()) ||
9256 (!LHSVecType && !LHSType->isRealType())) {
9257 Diag(Loc, diag::err_typecheck_vector_not_convertable_non_scalar)
9258 << LHSType << RHSType
9259 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
9260 return QualType();
9261 }
9262
9263 // OpenCL V1.1 6.2.6.p1:
9264 // If the operands are of more than one vector type, then an error shall
9265 // occur. Implicit conversions between vector types are not permitted, per
9266 // section 6.2.1.
9267 if (getLangOpts().OpenCL &&
9268 RHSVecType && isa<ExtVectorType>(RHSVecType) &&
9269 LHSVecType && isa<ExtVectorType>(LHSVecType)) {
9270 Diag(Loc, diag::err_opencl_implicit_vector_conversion) << LHSType
9271 << RHSType;
9272 return QualType();
9273 }
9274
9275
9276 // If there is a vector type that is not a ExtVector and a scalar, we reach
9277 // this point if scalar could not be converted to the vector's element type
9278 // without truncation.
9279 if ((RHSVecType && !isa<ExtVectorType>(RHSVecType)) ||
9280 (LHSVecType && !isa<ExtVectorType>(LHSVecType))) {
9281 QualType Scalar = LHSVecType ? RHSType : LHSType;
9282 QualType Vector = LHSVecType ? LHSType : RHSType;
9283 unsigned ScalarOrVector = LHSVecType && RHSVecType ? 1 : 0;
9284 Diag(Loc,
9285 diag::err_typecheck_vector_not_convertable_implict_truncation)
9286 << ScalarOrVector << Scalar << Vector;
9287
9288 return QualType();
9289 }
9290
9291 // Otherwise, use the generic diagnostic.
9292 Diag(Loc, DiagID)
9293 << LHSType << RHSType
9294 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
9295 return QualType();
9296 }
9297
9298 // checkArithmeticNull - Detect when a NULL constant is used improperly in an
9299 // expression. These are mainly cases where the null pointer is used as an
9300 // integer instead of a pointer.
9301 static void checkArithmeticNull(Sema &S, ExprResult &LHS, ExprResult &RHS,
9302 SourceLocation Loc, bool IsCompare) {
9303 // The canonical way to check for a GNU null is with isNullPointerConstant,
9304 // but we use a bit of a hack here for speed; this is a relatively
9305 // hot path, and isNullPointerConstant is slow.
9306 bool LHSNull = isa<GNUNullExpr>(LHS.get()->IgnoreParenImpCasts());
9307 bool RHSNull = isa<GNUNullExpr>(RHS.get()->IgnoreParenImpCasts());
9308
9309 QualType NonNullType = LHSNull ? RHS.get()->getType() : LHS.get()->getType();
9310
9311 // Avoid analyzing cases where the result will either be invalid (and
9312 // diagnosed as such) or entirely valid and not something to warn about.
9313 if ((!LHSNull && !RHSNull) || NonNullType->isBlockPointerType() ||
9314 NonNullType->isMemberPointerType() || NonNullType->isFunctionType())
9315 return;
9316
9317 // Comparison operations would not make sense with a null pointer no matter
9318 // what the other expression is.
9319 if (!IsCompare) {
9320 S.Diag(Loc, diag::warn_null_in_arithmetic_operation)
9321 << (LHSNull ? LHS.get()->getSourceRange() : SourceRange())
9322 << (RHSNull ? RHS.get()->getSourceRange() : SourceRange());
9323 return;
9324 }
9325
9326 // The rest of the operations only make sense with a null pointer
9327 // if the other expression is a pointer.
9328 if (LHSNull == RHSNull || NonNullType->isAnyPointerType() ||
9329 NonNullType->canDecayToPointerType())
9330 return;
9331
9332 S.Diag(Loc, diag::warn_null_in_comparison_operation)
9333 << LHSNull /* LHS is NULL */ << NonNullType
9334 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
9335 }
9336
9337 static void DiagnoseDivisionSizeofPointerOrArray(Sema &S, Expr *LHS, Expr *RHS,
9338 SourceLocation Loc) {
9339 const auto *LUE = dyn_cast<UnaryExprOrTypeTraitExpr>(LHS);
9340 const auto *RUE = dyn_cast<UnaryExprOrTypeTraitExpr>(RHS);
9341 if (!LUE || !RUE)
9342 return;
9343 if (LUE->getKind() != UETT_SizeOf || LUE->isArgumentType() ||
9344 RUE->getKind() != UETT_SizeOf)
9345 return;
9346
9347 const Expr *LHSArg = LUE->getArgumentExpr()->IgnoreParens();
9348 QualType LHSTy = LHSArg->getType();
9349 QualType RHSTy;
9350
9351 if (RUE->isArgumentType())
9352 RHSTy = RUE->getArgumentType();
9353 else
9354 RHSTy = RUE->getArgumentExpr()->IgnoreParens()->getType();
9355
9356 if (LHSTy->isPointerType() && !RHSTy->isPointerType()) {
9357 if (!S.Context.hasSameUnqualifiedType(LHSTy->getPointeeType(), RHSTy))
9358 return;
9359
9360 S.Diag(Loc, diag::warn_division_sizeof_ptr) << LHS << LHS->getSourceRange();
9361 if (const auto *DRE = dyn_cast<DeclRefExpr>(LHSArg)) {
9362 if (const ValueDecl *LHSArgDecl = DRE->getDecl())
9363 S.Diag(LHSArgDecl->getLocation(), diag::note_pointer_declared_here)
9364 << LHSArgDecl;
9365 }
9366 } else if (const auto *ArrayTy = S.Context.getAsArrayType(LHSTy)) {
9367 QualType ArrayElemTy = ArrayTy->getElementType();
9368 if (ArrayElemTy != S.Context.getBaseElementType(ArrayTy) ||
9369 ArrayElemTy->isDependentType() || RHSTy->isDependentType() ||
9370 ArrayElemTy->isCharType() ||
9371 S.Context.getTypeSize(ArrayElemTy) == S.Context.getTypeSize(RHSTy))
9372 return;
9373 S.Diag(Loc, diag::warn_division_sizeof_array)
9374 << LHSArg->getSourceRange() << ArrayElemTy << RHSTy;
9375 if (const auto *DRE = dyn_cast<DeclRefExpr>(LHSArg)) {
9376 if (const ValueDecl *LHSArgDecl = DRE->getDecl())
9377 S.Diag(LHSArgDecl->getLocation(), diag::note_array_declared_here)
9378 << LHSArgDecl;
9379 }
9380
9381 S.Diag(Loc, diag::note_precedence_silence) << RHS;
9382 }
9383 }
9384
9385 static void DiagnoseBadDivideOrRemainderValues(Sema& S, ExprResult &LHS,
9386 ExprResult &RHS,
9387 SourceLocation Loc, bool IsDiv) {
9388 // Check for division/remainder by zero.
9389 Expr::EvalResult RHSValue;
9390 if (!RHS.get()->isValueDependent() &&
9391 RHS.get()->EvaluateAsInt(RHSValue, S.Context) &&
9392 RHSValue.Val.getInt() == 0)
9393 S.DiagRuntimeBehavior(Loc, RHS.get(),
9394 S.PDiag(diag::warn_remainder_division_by_zero)
9395 << IsDiv << RHS.get()->getSourceRange());
9396 }
9397
9398 QualType Sema::CheckMultiplyDivideOperands(ExprResult &LHS, ExprResult &RHS,
9399 SourceLocation Loc,
9400 bool IsCompAssign, bool IsDiv) {
9401 checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
9402
9403 if (LHS.get()->getType()->isVectorType() ||
9404 RHS.get()->getType()->isVectorType())
9405 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
9406 /*AllowBothBool*/getLangOpts().AltiVec,
9407 /*AllowBoolConversions*/false);
9408
9409 QualType compType = UsualArithmeticConversions(
9410 LHS, RHS, Loc, IsCompAssign ? ACK_CompAssign : ACK_Arithmetic);
9411 if (LHS.isInvalid() || RHS.isInvalid())
9412 return QualType();
9413
9414
9415 if (compType.isNull() || !compType->isArithmeticType())
9416 return InvalidOperands(Loc, LHS, RHS);
9417 if (IsDiv) {
9418 DiagnoseBadDivideOrRemainderValues(*this, LHS, RHS, Loc, IsDiv);
9419 DiagnoseDivisionSizeofPointerOrArray(*this, LHS.get(), RHS.get(), Loc);
9420 }
9421 return compType;
9422 }
9423
9424 QualType Sema::CheckRemainderOperands(
9425 ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign) {
9426 checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
9427
9428 if (LHS.get()->getType()->isVectorType() ||
9429 RHS.get()->getType()->isVectorType()) {
9430 if (LHS.get()->getType()->hasIntegerRepresentation() &&
9431 RHS.get()->getType()->hasIntegerRepresentation())
9432 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
9433 /*AllowBothBool*/getLangOpts().AltiVec,
9434 /*AllowBoolConversions*/false);
9435 return InvalidOperands(Loc, LHS, RHS);
9436 }
9437
9438 QualType compType = UsualArithmeticConversions(
9439 LHS, RHS, Loc, IsCompAssign ? ACK_CompAssign : ACK_Arithmetic);
9440 if (LHS.isInvalid() || RHS.isInvalid())
9441 return QualType();
9442
9443 if (compType.isNull() || !compType->isIntegerType())
9444 return InvalidOperands(Loc, LHS, RHS);
9445 DiagnoseBadDivideOrRemainderValues(*this, LHS, RHS, Loc, false /* IsDiv */);
9446 return compType;
9447 }
9448
9449 /// Diagnose invalid arithmetic on two void pointers.
9450 static void diagnoseArithmeticOnTwoVoidPointers(Sema &S, SourceLocation Loc,
9451 Expr *LHSExpr, Expr *RHSExpr) {
9452 S.Diag(Loc, S.getLangOpts().CPlusPlus
9453 ? diag::err_typecheck_pointer_arith_void_type
9454 : diag::ext_gnu_void_ptr)
9455 << 1 /* two pointers */ << LHSExpr->getSourceRange()
9456 << RHSExpr->getSourceRange();
9457 }
9458
9459 /// Diagnose invalid arithmetic on a void pointer.
9460 static void diagnoseArithmeticOnVoidPointer(Sema &S, SourceLocation Loc,
9461 Expr *Pointer) {
9462 S.Diag(Loc, S.getLangOpts().CPlusPlus
9463 ? diag::err_typecheck_pointer_arith_void_type
9464 : diag::ext_gnu_void_ptr)
9465 << 0 /* one pointer */ << Pointer->getSourceRange();
9466 }
9467
9468 /// Diagnose invalid arithmetic on a null pointer.
9469 ///
9470 /// If \p IsGNUIdiom is true, the operation is using the 'p = (i8*)nullptr + n'
9471 /// idiom, which we recognize as a GNU extension.
9472 ///
9473 static void diagnoseArithmeticOnNullPointer(Sema &S, SourceLocation Loc,
9474 Expr *Pointer, bool IsGNUIdiom) {
9475 if (IsGNUIdiom)
9476 S.Diag(Loc, diag::warn_gnu_null_ptr_arith)
9477 << Pointer->getSourceRange();
9478 else
9479 S.Diag(Loc, diag::warn_pointer_arith_null_ptr)
9480 << S.getLangOpts().CPlusPlus << Pointer->getSourceRange();
9481 }
9482
9483 /// Diagnose invalid arithmetic on two function pointers.
9484 static void diagnoseArithmeticOnTwoFunctionPointers(Sema &S, SourceLocation Loc,
9485 Expr *LHS, Expr *RHS) {
9486 assert(LHS->getType()->isAnyPointerType());
9487 assert(RHS->getType()->isAnyPointerType());
9488 S.Diag(Loc, S.getLangOpts().CPlusPlus
9489 ? diag::err_typecheck_pointer_arith_function_type
9490 : diag::ext_gnu_ptr_func_arith)
9491 << 1 /* two pointers */ << LHS->getType()->getPointeeType()
9492 // We only show the second type if it differs from the first.
9493 << (unsigned)!S.Context.hasSameUnqualifiedType(LHS->getType(),
9494 RHS->getType())
9495 << RHS->getType()->getPointeeType()
9496 << LHS->getSourceRange() << RHS->getSourceRange();
9497 }
9498
9499 /// Diagnose invalid arithmetic on a function pointer.
9500 static void diagnoseArithmeticOnFunctionPointer(Sema &S, SourceLocation Loc,
9501 Expr *Pointer) {
9502 assert(Pointer->getType()->isAnyPointerType());
9503 S.Diag(Loc, S.getLangOpts().CPlusPlus
9504 ? diag::err_typecheck_pointer_arith_function_type
9505 : diag::ext_gnu_ptr_func_arith)
9506 << 0 /* one pointer */ << Pointer->getType()->getPointeeType()
9507 << 0 /* one pointer, so only one type */
9508 << Pointer->getSourceRange();
9509 }
9510
9511 /// Emit error if Operand is incomplete pointer type
9512 ///
9513 /// \returns True if pointer has incomplete type
9514 static bool checkArithmeticIncompletePointerType(Sema &S, SourceLocation Loc,
9515 Expr *Operand) {
9516 QualType ResType = Operand->getType();
9517 if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
9518 ResType = ResAtomicType->getValueType();
9519
9520 assert(ResType->isAnyPointerType() && !ResType->isDependentType());
9521 QualType PointeeTy = ResType->getPointeeType();
9522 return S.RequireCompleteType(Loc, PointeeTy,
9523 diag::err_typecheck_arithmetic_incomplete_type,
9524 PointeeTy, Operand->getSourceRange());
9525 }
9526
9527 /// Check the validity of an arithmetic pointer operand.
9528 ///
9529 /// If the operand has pointer type, this code will check for pointer types
9530 /// which are invalid in arithmetic operations. These will be diagnosed
9531 /// appropriately, including whether or not the use is supported as an
9532 /// extension.
9533 ///
9534 /// \returns True when the operand is valid to use (even if as an extension).
9535 static bool checkArithmeticOpPointerOperand(Sema &S, SourceLocation Loc,
9536 Expr *Operand) {
9537 QualType ResType = Operand->getType();
9538 if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
9539 ResType = ResAtomicType->getValueType();
9540
9541 if (!ResType->isAnyPointerType()) return true;
9542
9543 QualType PointeeTy = ResType->getPointeeType();
9544 if (PointeeTy->isVoidType()) {
9545 diagnoseArithmeticOnVoidPointer(S, Loc, Operand);
9546 return !S.getLangOpts().CPlusPlus;
9547 }
9548 if (PointeeTy->isFunctionType()) {
9549 diagnoseArithmeticOnFunctionPointer(S, Loc, Operand);
9550 return !S.getLangOpts().CPlusPlus;
9551 }
9552
9553 if (checkArithmeticIncompletePointerType(S, Loc, Operand)) return false;
9554
9555 return true;
9556 }
9557
9558 /// Check the validity of a binary arithmetic operation w.r.t. pointer
9559 /// operands.
9560 ///
9561 /// This routine will diagnose any invalid arithmetic on pointer operands much
9562 /// like \see checkArithmeticOpPointerOperand. However, it has special logic
9563 /// for emitting a single diagnostic even for operations where both LHS and RHS
9564 /// are (potentially problematic) pointers.
9565 ///
9566 /// \returns True when the operand is valid to use (even if as an extension).
9567 static bool checkArithmeticBinOpPointerOperands(Sema &S, SourceLocation Loc,
9568 Expr *LHSExpr, Expr *RHSExpr) {
9569 bool isLHSPointer = LHSExpr->getType()->isAnyPointerType();
9570 bool isRHSPointer = RHSExpr->getType()->isAnyPointerType();
9571 if (!isLHSPointer && !isRHSPointer) return true;
9572
9573 QualType LHSPointeeTy, RHSPointeeTy;
9574 if (isLHSPointer) LHSPointeeTy = LHSExpr->getType()->getPointeeType();
9575 if (isRHSPointer) RHSPointeeTy = RHSExpr->getType()->getPointeeType();
9576
9577 // if both are pointers check if operation is valid wrt address spaces
9578 if (S.getLangOpts().OpenCL && isLHSPointer && isRHSPointer) {
9579 const PointerType *lhsPtr = LHSExpr->getType()->castAs<PointerType>();
9580 const PointerType *rhsPtr = RHSExpr->getType()->castAs<PointerType>();
9581 if (!lhsPtr->isAddressSpaceOverlapping(*rhsPtr)) {
9582 S.Diag(Loc,
9583 diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
9584 << LHSExpr->getType() << RHSExpr->getType() << 1 /*arithmetic op*/
9585 << LHSExpr->getSourceRange() << RHSExpr->getSourceRange();
9586 return false;
9587 }
9588 }
9589
9590 // Check for arithmetic on pointers to incomplete types.
9591 bool isLHSVoidPtr = isLHSPointer && LHSPointeeTy->isVoidType();
9592 bool isRHSVoidPtr = isRHSPointer && RHSPointeeTy->isVoidType();
9593 if (isLHSVoidPtr || isRHSVoidPtr) {
9594 if (!isRHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, LHSExpr);
9595 else if (!isLHSVoidPtr) diagnoseArithmeticOnVoidPointer(S, Loc, RHSExpr);
9596 else diagnoseArithmeticOnTwoVoidPointers(S, Loc, LHSExpr, RHSExpr);
9597
9598 return !S.getLangOpts().CPlusPlus;
9599 }
9600
9601 bool isLHSFuncPtr = isLHSPointer && LHSPointeeTy->isFunctionType();
9602 bool isRHSFuncPtr = isRHSPointer && RHSPointeeTy->isFunctionType();
9603 if (isLHSFuncPtr || isRHSFuncPtr) {
9604 if (!isRHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc, LHSExpr);
9605 else if (!isLHSFuncPtr) diagnoseArithmeticOnFunctionPointer(S, Loc,
9606 RHSExpr);
9607 else diagnoseArithmeticOnTwoFunctionPointers(S, Loc, LHSExpr, RHSExpr);
9608
9609 return !S.getLangOpts().CPlusPlus;
9610 }
9611
9612 if (isLHSPointer && checkArithmeticIncompletePointerType(S, Loc, LHSExpr))
9613 return false;
9614 if (isRHSPointer && checkArithmeticIncompletePointerType(S, Loc, RHSExpr))
9615 return false;
9616
9617 return true;
9618 }
9619
9620 /// diagnoseStringPlusInt - Emit a warning when adding an integer to a string
9621 /// literal.
9622 static void diagnoseStringPlusInt(Sema &Self, SourceLocation OpLoc,
9623 Expr *LHSExpr, Expr *RHSExpr) {
9624 StringLiteral* StrExpr = dyn_cast<StringLiteral>(LHSExpr->IgnoreImpCasts());
9625 Expr* IndexExpr = RHSExpr;
9626 if (!StrExpr) {
9627 StrExpr = dyn_cast<StringLiteral>(RHSExpr->IgnoreImpCasts());
9628 IndexExpr = LHSExpr;
9629 }
9630
9631 bool IsStringPlusInt = StrExpr &&
9632 IndexExpr->getType()->isIntegralOrUnscopedEnumerationType();
9633 if (!IsStringPlusInt || IndexExpr->isValueDependent())
9634 return;
9635
9636 SourceRange DiagRange(LHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
9637 Self.Diag(OpLoc, diag::warn_string_plus_int)
9638 << DiagRange << IndexExpr->IgnoreImpCasts()->getType();
9639
9640 // Only print a fixit for "str" + int, not for int + "str".
9641 if (IndexExpr == RHSExpr) {
9642 SourceLocation EndLoc = Self.getLocForEndOfToken(RHSExpr->getEndLoc());
9643 Self.Diag(OpLoc, diag::note_string_plus_scalar_silence)
9644 << FixItHint::CreateInsertion(LHSExpr->getBeginLoc(), "&")
9645 << FixItHint::CreateReplacement(SourceRange(OpLoc), "[")
9646 << FixItHint::CreateInsertion(EndLoc, "]");
9647 } else
9648 Self.Diag(OpLoc, diag::note_string_plus_scalar_silence);
9649 }
9650
9651 /// Emit a warning when adding a char literal to a string.
9652 static void diagnoseStringPlusChar(Sema &Self, SourceLocation OpLoc,
9653 Expr *LHSExpr, Expr *RHSExpr) {
9654 const Expr *StringRefExpr = LHSExpr;
9655 const CharacterLiteral *CharExpr =
9656 dyn_cast<CharacterLiteral>(RHSExpr->IgnoreImpCasts());
9657
9658 if (!CharExpr) {
9659 CharExpr = dyn_cast<CharacterLiteral>(LHSExpr->IgnoreImpCasts());
9660 StringRefExpr = RHSExpr;
9661 }
9662
9663 if (!CharExpr || !StringRefExpr)
9664 return;
9665
9666 const QualType StringType = StringRefExpr->getType();
9667
9668 // Return if not a PointerType.
9669 if (!StringType->isAnyPointerType())
9670 return;
9671
9672 // Return if not a CharacterType.
9673 if (!StringType->getPointeeType()->isAnyCharacterType())
9674 return;
9675
9676 ASTContext &Ctx = Self.getASTContext();
9677 SourceRange DiagRange(LHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
9678
9679 const QualType CharType = CharExpr->getType();
9680 if (!CharType->isAnyCharacterType() &&
9681 CharType->isIntegerType() &&
9682 llvm::isUIntN(Ctx.getCharWidth(), CharExpr->getValue())) {
9683 Self.Diag(OpLoc, diag::warn_string_plus_char)
9684 << DiagRange << Ctx.CharTy;
9685 } else {
9686 Self.Diag(OpLoc, diag::warn_string_plus_char)
9687 << DiagRange << CharExpr->getType();
9688 }
9689
9690 // Only print a fixit for str + char, not for char + str.
9691 if (isa<CharacterLiteral>(RHSExpr->IgnoreImpCasts())) {
9692 SourceLocation EndLoc = Self.getLocForEndOfToken(RHSExpr->getEndLoc());
9693 Self.Diag(OpLoc, diag::note_string_plus_scalar_silence)
9694 << FixItHint::CreateInsertion(LHSExpr->getBeginLoc(), "&")
9695 << FixItHint::CreateReplacement(SourceRange(OpLoc), "[")
9696 << FixItHint::CreateInsertion(EndLoc, "]");
9697 } else {
9698 Self.Diag(OpLoc, diag::note_string_plus_scalar_silence);
9699 }
9700 }
9701
9702 /// Emit error when two pointers are incompatible.
9703 static void diagnosePointerIncompatibility(Sema &S, SourceLocation Loc,
9704 Expr *LHSExpr, Expr *RHSExpr) {
9705 assert(LHSExpr->getType()->isAnyPointerType());
9706 assert(RHSExpr->getType()->isAnyPointerType());
9707 S.Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
9708 << LHSExpr->getType() << RHSExpr->getType() << LHSExpr->getSourceRange()
9709 << RHSExpr->getSourceRange();
9710 }
9711
9712 // C99 6.5.6
9713 QualType Sema::CheckAdditionOperands(ExprResult &LHS, ExprResult &RHS,
9714 SourceLocation Loc, BinaryOperatorKind Opc,
9715 QualType* CompLHSTy) {
9716 checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
9717
9718 if (LHS.get()->getType()->isVectorType() ||
9719 RHS.get()->getType()->isVectorType()) {
9720 QualType compType = CheckVectorOperands(
9721 LHS, RHS, Loc, CompLHSTy,
9722 /*AllowBothBool*/getLangOpts().AltiVec,
9723 /*AllowBoolConversions*/getLangOpts().ZVector);
9724 if (CompLHSTy) *CompLHSTy = compType;
9725 return compType;
9726 }
9727
9728 QualType compType = UsualArithmeticConversions(
9729 LHS, RHS, Loc, CompLHSTy ? ACK_CompAssign : ACK_Arithmetic);
9730 if (LHS.isInvalid() || RHS.isInvalid())
9731 return QualType();
9732
9733 // Diagnose "string literal" '+' int and string '+' "char literal".
9734 if (Opc == BO_Add) {
9735 diagnoseStringPlusInt(*this, Loc, LHS.get(), RHS.get());
9736 diagnoseStringPlusChar(*this, Loc, LHS.get(), RHS.get());
9737 }
9738
9739 // handle the common case first (both operands are arithmetic).
9740 if (!compType.isNull() && compType->isArithmeticType()) {
9741 if (CompLHSTy) *CompLHSTy = compType;
9742 return compType;
9743 }
9744
9745 // Type-checking. Ultimately the pointer's going to be in PExp;
9746 // note that we bias towards the LHS being the pointer.
9747 Expr *PExp = LHS.get(), *IExp = RHS.get();
9748
9749 bool isObjCPointer;
9750 if (PExp->getType()->isPointerType()) {
9751 isObjCPointer = false;
9752 } else if (PExp->getType()->isObjCObjectPointerType()) {
9753 isObjCPointer = true;
9754 } else {
9755 std::swap(PExp, IExp);
9756 if (PExp->getType()->isPointerType()) {
9757 isObjCPointer = false;
9758 } else if (PExp->getType()->isObjCObjectPointerType()) {
9759 isObjCPointer = true;
9760 } else {
9761 return InvalidOperands(Loc, LHS, RHS);
9762 }
9763 }
9764 assert(PExp->getType()->isAnyPointerType());
9765
9766 if (!IExp->getType()->isIntegerType())
9767 return InvalidOperands(Loc, LHS, RHS);
9768
9769 // Adding to a null pointer results in undefined behavior.
9770 if (PExp->IgnoreParenCasts()->isNullPointerConstant(
9771 Context, Expr::NPC_ValueDependentIsNotNull)) {
9772 // In C++ adding zero to a null pointer is defined.
9773 Expr::EvalResult KnownVal;
9774 if (!getLangOpts().CPlusPlus ||
9775 (!IExp->isValueDependent() &&
9776 (!IExp->EvaluateAsInt(KnownVal, Context) ||
9777 KnownVal.Val.getInt() != 0))) {
9778 // Check the conditions to see if this is the 'p = nullptr + n' idiom.
9779 bool IsGNUIdiom = BinaryOperator::isNullPointerArithmeticExtension(
9780 Context, BO_Add, PExp, IExp);
9781 diagnoseArithmeticOnNullPointer(*this, Loc, PExp, IsGNUIdiom);
9782 }
9783 }
9784
9785 if (!checkArithmeticOpPointerOperand(*this, Loc, PExp))
9786 return QualType();
9787
9788 if (isObjCPointer && checkArithmeticOnObjCPointer(*this, Loc, PExp))
9789 return QualType();
9790
9791 // Check array bounds for pointer arithemtic
9792 CheckArrayAccess(PExp, IExp);
9793
9794 if (CompLHSTy) {
9795 QualType LHSTy = Context.isPromotableBitField(LHS.get());
9796 if (LHSTy.isNull()) {
9797 LHSTy = LHS.get()->getType();
9798 if (LHSTy->isPromotableIntegerType())
9799 LHSTy = Context.getPromotedIntegerType(LHSTy);
9800 }
9801 *CompLHSTy = LHSTy;
9802 }
9803
9804 return PExp->getType();
9805 }
9806
9807 // C99 6.5.6
9808 QualType Sema::CheckSubtractionOperands(ExprResult &LHS, ExprResult &RHS,
9809 SourceLocation Loc,
9810 QualType* CompLHSTy) {
9811 checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
9812
9813 if (LHS.get()->getType()->isVectorType() ||
9814 RHS.get()->getType()->isVectorType()) {
9815 QualType compType = CheckVectorOperands(
9816 LHS, RHS, Loc, CompLHSTy,
9817 /*AllowBothBool*/getLangOpts().AltiVec,
9818 /*AllowBoolConversions*/getLangOpts().ZVector);
9819 if (CompLHSTy) *CompLHSTy = compType;
9820 return compType;
9821 }
9822
9823 QualType compType = UsualArithmeticConversions(
9824 LHS, RHS, Loc, CompLHSTy ? ACK_CompAssign : ACK_Arithmetic);
9825 if (LHS.isInvalid() || RHS.isInvalid())
9826 return QualType();
9827
9828 // Enforce type constraints: C99 6.5.6p3.
9829
9830 // Handle the common case first (both operands are arithmetic).
9831 if (!compType.isNull() && compType->isArithmeticType()) {
9832 if (CompLHSTy) *CompLHSTy = compType;
9833 return compType;
9834 }
9835
9836 // Either ptr - int or ptr - ptr.
9837 if (LHS.get()->getType()->isAnyPointerType()) {
9838 QualType lpointee = LHS.get()->getType()->getPointeeType();
9839
9840 // Diagnose bad cases where we step over interface counts.
9841 if (LHS.get()->getType()->isObjCObjectPointerType() &&
9842 checkArithmeticOnObjCPointer(*this, Loc, LHS.get()))
9843 return QualType();
9844
9845 // The result type of a pointer-int computation is the pointer type.
9846 if (RHS.get()->getType()->isIntegerType()) {
9847 // Subtracting from a null pointer should produce a warning.
9848 // The last argument to the diagnose call says this doesn't match the
9849 // GNU int-to-pointer idiom.
9850 if (LHS.get()->IgnoreParenCasts()->isNullPointerConstant(Context,
9851 Expr::NPC_ValueDependentIsNotNull)) {
9852 // In C++ adding zero to a null pointer is defined.
9853 Expr::EvalResult KnownVal;
9854 if (!getLangOpts().CPlusPlus ||
9855 (!RHS.get()->isValueDependent() &&
9856 (!RHS.get()->EvaluateAsInt(KnownVal, Context) ||
9857 KnownVal.Val.getInt() != 0))) {
9858 diagnoseArithmeticOnNullPointer(*this, Loc, LHS.get(), false);
9859 }
9860 }
9861
9862 if (!checkArithmeticOpPointerOperand(*this, Loc, LHS.get()))
9863 return QualType();
9864
9865 // Check array bounds for pointer arithemtic
9866 CheckArrayAccess(LHS.get(), RHS.get(), /*ArraySubscriptExpr*/nullptr,
9867 /*AllowOnePastEnd*/true, /*IndexNegated*/true);
9868
9869 if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
9870 return LHS.get()->getType();
9871 }
9872
9873 // Handle pointer-pointer subtractions.
9874 if (const PointerType *RHSPTy
9875 = RHS.get()->getType()->getAs<PointerType>()) {
9876 QualType rpointee = RHSPTy->getPointeeType();
9877
9878 if (getLangOpts().CPlusPlus) {
9879 // Pointee types must be the same: C++ [expr.add]
9880 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
9881 diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
9882 }
9883 } else {
9884 // Pointee types must be compatible C99 6.5.6p3
9885 if (!Context.typesAreCompatible(
9886 Context.getCanonicalType(lpointee).getUnqualifiedType(),
9887 Context.getCanonicalType(rpointee).getUnqualifiedType())) {
9888 diagnosePointerIncompatibility(*this, Loc, LHS.get(), RHS.get());
9889 return QualType();
9890 }
9891 }
9892
9893 if (!checkArithmeticBinOpPointerOperands(*this, Loc,
9894 LHS.get(), RHS.get()))
9895 return QualType();
9896
9897 // FIXME: Add warnings for nullptr - ptr.
9898
9899 // The pointee type may have zero size. As an extension, a structure or
9900 // union may have zero size or an array may have zero length. In this
9901 // case subtraction does not make sense.
9902 if (!rpointee->isVoidType() && !rpointee->isFunctionType()) {
9903 CharUnits ElementSize = Context.getTypeSizeInChars(rpointee);
9904 if (ElementSize.isZero()) {
9905 Diag(Loc,diag::warn_sub_ptr_zero_size_types)
9906 << rpointee.getUnqualifiedType()
9907 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
9908 }
9909 }
9910
9911 if (CompLHSTy) *CompLHSTy = LHS.get()->getType();
9912 return Context.getPointerDiffType();
9913 }
9914 }
9915
9916 return InvalidOperands(Loc, LHS, RHS);
9917 }
9918
9919 static bool isScopedEnumerationType(QualType T) {
9920 if (const EnumType *ET = T->getAs<EnumType>())
9921 return ET->getDecl()->isScoped();
9922 return false;
9923 }
9924
9925 static void DiagnoseBadShiftValues(Sema& S, ExprResult &LHS, ExprResult &RHS,
9926 SourceLocation Loc, BinaryOperatorKind Opc,
9927 QualType LHSType) {
9928 // OpenCL 6.3j: shift values are effectively % word size of LHS (more defined),
9929 // so skip remaining warnings as we don't want to modify values within Sema.
9930 if (S.getLangOpts().OpenCL)
9931 return;
9932
9933 // Check right/shifter operand
9934 Expr::EvalResult RHSResult;
9935 if (RHS.get()->isValueDependent() ||
9936 !RHS.get()->EvaluateAsInt(RHSResult, S.Context))
9937 return;
9938 llvm::APSInt Right = RHSResult.Val.getInt();
9939
9940 if (Right.isNegative()) {
9941 S.DiagRuntimeBehavior(Loc, RHS.get(),
9942 S.PDiag(diag::warn_shift_negative)
9943 << RHS.get()->getSourceRange());
9944 return;
9945 }
9946 llvm::APInt LeftBits(Right.getBitWidth(),
9947 S.Context.getTypeSize(LHS.get()->getType()));
9948 if (Right.uge(LeftBits)) {
9949 S.DiagRuntimeBehavior(Loc, RHS.get(),
9950 S.PDiag(diag::warn_shift_gt_typewidth)
9951 << RHS.get()->getSourceRange());
9952 return;
9953 }
9954 if (Opc != BO_Shl)
9955 return;
9956
9957 // When left shifting an ICE which is signed, we can check for overflow which
9958 // according to C++ standards prior to C++2a has undefined behavior
9959 // ([expr.shift] 5.8/2). Unsigned integers have defined behavior modulo one
9960 // more than the maximum value representable in the result type, so never
9961 // warn for those. (FIXME: Unsigned left-shift overflow in a constant
9962 // expression is still probably a bug.)
9963 Expr::EvalResult LHSResult;
9964 if (LHS.get()->isValueDependent() ||
9965 LHSType->hasUnsignedIntegerRepresentation() ||
9966 !LHS.get()->EvaluateAsInt(LHSResult, S.Context))
9967 return;
9968 llvm::APSInt Left = LHSResult.Val.getInt();
9969
9970 // If LHS does not have a signed type and non-negative value
9971 // then, the behavior is undefined before C++2a. Warn about it.
9972 if (Left.isNegative() && !S.getLangOpts().isSignedOverflowDefined() &&
9973 !S.getLangOpts().CPlusPlus2a) {
9974 S.DiagRuntimeBehavior(Loc, LHS.get(),
9975 S.PDiag(diag::warn_shift_lhs_negative)
9976 << LHS.get()->getSourceRange());
9977 return;
9978 }
9979
9980 llvm::APInt ResultBits =
9981 static_cast<llvm::APInt&>(Right) + Left.getMinSignedBits();
9982 if (LeftBits.uge(ResultBits))
9983 return;
9984 llvm::APSInt Result = Left.extend(ResultBits.getLimitedValue());
9985 Result = Result.shl(Right);
9986
9987 // Print the bit representation of the signed integer as an unsigned
9988 // hexadecimal number.
9989 SmallString<40> HexResult;
9990 Result.toString(HexResult, 16, /*Signed =*/false, /*Literal =*/true);
9991
9992 // If we are only missing a sign bit, this is less likely to result in actual
9993 // bugs -- if the result is cast back to an unsigned type, it will have the
9994 // expected value. Thus we place this behind a different warning that can be
9995 // turned off separately if needed.
9996 if (LeftBits == ResultBits - 1) {
9997 S.Diag(Loc, diag::warn_shift_result_sets_sign_bit)
9998 << HexResult << LHSType
9999 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
10000 return;
10001 }
10002
10003 S.Diag(Loc, diag::warn_shift_result_gt_typewidth)
10004 << HexResult.str() << Result.getMinSignedBits() << LHSType
10005 << Left.getBitWidth() << LHS.get()->getSourceRange()
10006 << RHS.get()->getSourceRange();
10007 }
10008
10009 /// Return the resulting type when a vector is shifted
10010 /// by a scalar or vector shift amount.
10011 static QualType checkVectorShift(Sema &S, ExprResult &LHS, ExprResult &RHS,
10012 SourceLocation Loc, bool IsCompAssign) {
10013 // OpenCL v1.1 s6.3.j says RHS can be a vector only if LHS is a vector.
10014 if ((S.LangOpts.OpenCL || S.LangOpts.ZVector) &&
10015 !LHS.get()->getType()->isVectorType()) {
10016 S.Diag(Loc, diag::err_shift_rhs_only_vector)
10017 << RHS.get()->getType() << LHS.get()->getType()
10018 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
10019 return QualType();
10020 }
10021
10022 if (!IsCompAssign) {
10023 LHS = S.UsualUnaryConversions(LHS.get());
10024 if (LHS.isInvalid()) return QualType();
10025 }
10026
10027 RHS = S.UsualUnaryConversions(RHS.get());
10028 if (RHS.isInvalid()) return QualType();
10029
10030 QualType LHSType = LHS.get()->getType();
10031 // Note that LHS might be a scalar because the routine calls not only in
10032 // OpenCL case.
10033 const VectorType *LHSVecTy = LHSType->getAs<VectorType>();
10034 QualType LHSEleType = LHSVecTy ? LHSVecTy->getElementType() : LHSType;
10035
10036 // Note that RHS might not be a vector.
10037 QualType RHSType = RHS.get()->getType();
10038 const VectorType *RHSVecTy = RHSType->getAs<VectorType>();
10039 QualType RHSEleType = RHSVecTy ? RHSVecTy->getElementType() : RHSType;
10040
10041 // The operands need to be integers.
10042 if (!LHSEleType->isIntegerType()) {
10043 S.Diag(Loc, diag::err_typecheck_expect_int)
10044 << LHS.get()->getType() << LHS.get()->getSourceRange();
10045 return QualType();
10046 }
10047
10048 if (!RHSEleType->isIntegerType()) {
10049 S.Diag(Loc, diag::err_typecheck_expect_int)
10050 << RHS.get()->getType() << RHS.get()->getSourceRange();
10051 return QualType();
10052 }
10053
10054 if (!LHSVecTy) {
10055 assert(RHSVecTy);
10056 if (IsCompAssign)
10057 return RHSType;
10058 if (LHSEleType != RHSEleType) {
10059 LHS = S.ImpCastExprToType(LHS.get(),RHSEleType, CK_IntegralCast);
10060 LHSEleType = RHSEleType;
10061 }
10062 QualType VecTy =
10063 S.Context.getExtVectorType(LHSEleType, RHSVecTy->getNumElements());
10064 LHS = S.ImpCastExprToType(LHS.get(), VecTy, CK_VectorSplat);
10065 LHSType = VecTy;
10066 } else if (RHSVecTy) {
10067 // OpenCL v1.1 s6.3.j says that for vector types, the operators
10068 // are applied component-wise. So if RHS is a vector, then ensure
10069 // that the number of elements is the same as LHS...
10070 if (RHSVecTy->getNumElements() != LHSVecTy->getNumElements()) {
10071 S.Diag(Loc, diag::err_typecheck_vector_lengths_not_equal)
10072 << LHS.get()->getType() << RHS.get()->getType()
10073 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
10074 return QualType();
10075 }
10076 if (!S.LangOpts.OpenCL && !S.LangOpts.ZVector) {
10077 const BuiltinType *LHSBT = LHSEleType->getAs<clang::BuiltinType>();
10078 const BuiltinType *RHSBT = RHSEleType->getAs<clang::BuiltinType>();
10079 if (LHSBT != RHSBT &&
10080 S.Context.getTypeSize(LHSBT) != S.Context.getTypeSize(RHSBT)) {
10081 S.Diag(Loc, diag::warn_typecheck_vector_element_sizes_not_equal)
10082 << LHS.get()->getType() << RHS.get()->getType()
10083 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
10084 }
10085 }
10086 } else {
10087 // ...else expand RHS to match the number of elements in LHS.
10088 QualType VecTy =
10089 S.Context.getExtVectorType(RHSEleType, LHSVecTy->getNumElements());
10090 RHS = S.ImpCastExprToType(RHS.get(), VecTy, CK_VectorSplat);
10091 }
10092
10093 return LHSType;
10094 }
10095
10096 // C99 6.5.7
10097 QualType Sema::CheckShiftOperands(ExprResult &LHS, ExprResult &RHS,
10098 SourceLocation Loc, BinaryOperatorKind Opc,
10099 bool IsCompAssign) {
10100 checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
10101
10102 // Vector shifts promote their scalar inputs to vector type.
10103 if (LHS.get()->getType()->isVectorType() ||
10104 RHS.get()->getType()->isVectorType()) {
10105 if (LangOpts.ZVector) {
10106 // The shift operators for the z vector extensions work basically
10107 // like general shifts, except that neither the LHS nor the RHS is
10108 // allowed to be a "vector bool".
10109 if (auto LHSVecType = LHS.get()->getType()->getAs<VectorType>())
10110 if (LHSVecType->getVectorKind() == VectorType::AltiVecBool)
10111 return InvalidOperands(Loc, LHS, RHS);
10112 if (auto RHSVecType = RHS.get()->getType()->getAs<VectorType>())
10113 if (RHSVecType->getVectorKind() == VectorType::AltiVecBool)
10114 return InvalidOperands(Loc, LHS, RHS);
10115 }
10116 return checkVectorShift(*this, LHS, RHS, Loc, IsCompAssign);
10117 }
10118
10119 // Shifts don't perform usual arithmetic conversions, they just do integer
10120 // promotions on each operand. C99 6.5.7p3
10121
10122 // For the LHS, do usual unary conversions, but then reset them away
10123 // if this is a compound assignment.
10124 ExprResult OldLHS = LHS;
10125 LHS = UsualUnaryConversions(LHS.get());
10126 if (LHS.isInvalid())
10127 return QualType();
10128 QualType LHSType = LHS.get()->getType();
10129 if (IsCompAssign) LHS = OldLHS;
10130
10131 // The RHS is simpler.
10132 RHS = UsualUnaryConversions(RHS.get());
10133 if (RHS.isInvalid())
10134 return QualType();
10135 QualType RHSType = RHS.get()->getType();
10136
10137 // C99 6.5.7p2: Each of the operands shall have integer type.
10138 if (!LHSType->hasIntegerRepresentation() ||
10139 !RHSType->hasIntegerRepresentation())
10140 return InvalidOperands(Loc, LHS, RHS);
10141
10142 // C++0x: Don't allow scoped enums. FIXME: Use something better than
10143 // hasIntegerRepresentation() above instead of this.
10144 if (isScopedEnumerationType(LHSType) ||
10145 isScopedEnumerationType(RHSType)) {
10146 return InvalidOperands(Loc, LHS, RHS);
10147 }
10148 // Sanity-check shift operands
10149 DiagnoseBadShiftValues(*this, LHS, RHS, Loc, Opc, LHSType);
10150
10151 // "The type of the result is that of the promoted left operand."
10152 return LHSType;
10153 }
10154
10155 /// Diagnose bad pointer comparisons.
10156 static void diagnoseDistinctPointerComparison(Sema &S, SourceLocation Loc,
10157 ExprResult &LHS, ExprResult &RHS,
10158 bool IsError) {
10159 S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_distinct_pointers
10160 : diag::ext_typecheck_comparison_of_distinct_pointers)
10161 << LHS.get()->getType() << RHS.get()->getType()
10162 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
10163 }
10164
10165 /// Returns false if the pointers are converted to a composite type,
10166 /// true otherwise.
10167 static bool convertPointersToCompositeType(Sema &S, SourceLocation Loc,
10168 ExprResult &LHS, ExprResult &RHS) {
10169 // C++ [expr.rel]p2:
10170 // [...] Pointer conversions (4.10) and qualification
10171 // conversions (4.4) are performed on pointer operands (or on
10172 // a pointer operand and a null pointer constant) to bring
10173 // them to their composite pointer type. [...]
10174 //
10175 // C++ [expr.eq]p1 uses the same notion for (in)equality
10176 // comparisons of pointers.
10177
10178 QualType LHSType = LHS.get()->getType();
10179 QualType RHSType = RHS.get()->getType();
10180 assert(LHSType->isPointerType() || RHSType->isPointerType() ||
10181 LHSType->isMemberPointerType() || RHSType->isMemberPointerType());
10182
10183 QualType T = S.FindCompositePointerType(Loc, LHS, RHS);
10184 if (T.isNull()) {
10185 if ((LHSType->isAnyPointerType() || LHSType->isMemberPointerType()) &&
10186 (RHSType->isAnyPointerType() || RHSType->isMemberPointerType()))
10187 diagnoseDistinctPointerComparison(S, Loc, LHS, RHS, /*isError*/true);
10188 else
10189 S.InvalidOperands(Loc, LHS, RHS);
10190 return true;
10191 }
10192
10193 return false;
10194 }
10195
10196 static void diagnoseFunctionPointerToVoidComparison(Sema &S, SourceLocation Loc,
10197 ExprResult &LHS,
10198 ExprResult &RHS,
10199 bool IsError) {
10200 S.Diag(Loc, IsError ? diag::err_typecheck_comparison_of_fptr_to_void
10201 : diag::ext_typecheck_comparison_of_fptr_to_void)
10202 << LHS.get()->getType() << RHS.get()->getType()
10203 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
10204 }
10205
10206 static bool isObjCObjectLiteral(ExprResult &E) {
10207 switch (E.get()->IgnoreParenImpCasts()->getStmtClass()) {
10208 case Stmt::ObjCArrayLiteralClass:
10209 case Stmt::ObjCDictionaryLiteralClass:
10210 case Stmt::ObjCStringLiteralClass:
10211 case Stmt::ObjCBoxedExprClass:
10212 return true;
10213 default:
10214 // Note that ObjCBoolLiteral is NOT an object literal!
10215 return false;
10216 }
10217 }
10218
10219 static bool hasIsEqualMethod(Sema &S, const Expr *LHS, const Expr *RHS) {
10220 const ObjCObjectPointerType *Type =
10221 LHS->getType()->getAs<ObjCObjectPointerType>();
10222
10223 // If this is not actually an Objective-C object, bail out.
10224 if (!Type)
10225 return false;
10226
10227 // Get the LHS object's interface type.
10228 QualType InterfaceType = Type->getPointeeType();
10229
10230 // If the RHS isn't an Objective-C object, bail out.
10231 if (!RHS->getType()->isObjCObjectPointerType())
10232 return false;
10233
10234 // Try to find the -isEqual: method.
10235 Selector IsEqualSel = S.NSAPIObj->getIsEqualSelector();
10236 ObjCMethodDecl *Method = S.LookupMethodInObjectType(IsEqualSel,
10237 InterfaceType,
10238 /*IsInstance=*/true);
10239 if (!Method) {
10240 if (Type->isObjCIdType()) {
10241 // For 'id', just check the global pool.
10242 Method = S.LookupInstanceMethodInGlobalPool(IsEqualSel, SourceRange(),
10243 /*receiverId=*/true);
10244 } else {
10245 // Check protocols.
10246 Method = S.LookupMethodInQualifiedType(IsEqualSel, Type,
10247 /*IsInstance=*/true);
10248 }
10249 }
10250
10251 if (!Method)
10252 return false;
10253
10254 QualType T = Method->parameters()[0]->getType();
10255 if (!T->isObjCObjectPointerType())
10256 return false;
10257
10258 QualType R = Method->getReturnType();
10259 if (!R->isScalarType())
10260 return false;
10261
10262 return true;
10263 }
10264
10265 Sema::ObjCLiteralKind Sema::CheckLiteralKind(Expr *FromE) {
10266 FromE = FromE->IgnoreParenImpCasts();
10267 switch (FromE->getStmtClass()) {
10268 default:
10269 break;
10270 case Stmt::ObjCStringLiteralClass:
10271 // "string literal"
10272 return LK_String;
10273 case Stmt::ObjCArrayLiteralClass:
10274 // "array literal"
10275 return LK_Array;
10276 case Stmt::ObjCDictionaryLiteralClass:
10277 // "dictionary literal"
10278 return LK_Dictionary;
10279 case Stmt::BlockExprClass:
10280 return LK_Block;
10281 case Stmt::ObjCBoxedExprClass: {
10282 Expr *Inner = cast<ObjCBoxedExpr>(FromE)->getSubExpr()->IgnoreParens();
10283 switch (Inner->getStmtClass()) {
10284 case Stmt::IntegerLiteralClass:
10285 case Stmt::FloatingLiteralClass:
10286 case Stmt::CharacterLiteralClass:
10287 case Stmt::ObjCBoolLiteralExprClass:
10288 case Stmt::CXXBoolLiteralExprClass:
10289 // "numeric literal"
10290 return LK_Numeric;
10291 case Stmt::ImplicitCastExprClass: {
10292 CastKind CK = cast<CastExpr>(Inner)->getCastKind();
10293 // Boolean literals can be represented by implicit casts.
10294 if (CK == CK_IntegralToBoolean || CK == CK_IntegralCast)
10295 return LK_Numeric;
10296 break;
10297 }
10298 default:
10299 break;
10300 }
10301 return LK_Boxed;
10302 }
10303 }
10304 return LK_None;
10305 }
10306
10307 static void diagnoseObjCLiteralComparison(Sema &S, SourceLocation Loc,
10308 ExprResult &LHS, ExprResult &RHS,
10309 BinaryOperator::Opcode Opc){
10310 Expr *Literal;
10311 Expr *Other;
10312 if (isObjCObjectLiteral(LHS)) {
10313 Literal = LHS.get();
10314 Other = RHS.get();
10315 } else {
10316 Literal = RHS.get();
10317 Other = LHS.get();
10318 }
10319
10320 // Don't warn on comparisons against nil.
10321 Other = Other->IgnoreParenCasts();
10322 if (Other->isNullPointerConstant(S.getASTContext(),
10323 Expr::NPC_ValueDependentIsNotNull))
10324 return;
10325
10326 // This should be kept in sync with warn_objc_literal_comparison.
10327 // LK_String should always be after the other literals, since it has its own
10328 // warning flag.
10329 Sema::ObjCLiteralKind LiteralKind = S.CheckLiteralKind(Literal);
10330 assert(LiteralKind != Sema::LK_Block);
10331 if (LiteralKind == Sema::LK_None) {
10332 llvm_unreachable("Unknown Objective-C object literal kind");
10333 }
10334
10335 if (LiteralKind == Sema::LK_String)
10336 S.Diag(Loc, diag::warn_objc_string_literal_comparison)
10337 << Literal->getSourceRange();
10338 else
10339 S.Diag(Loc, diag::warn_objc_literal_comparison)
10340 << LiteralKind << Literal->getSourceRange();
10341
10342 if (BinaryOperator::isEqualityOp(Opc) &&
10343 hasIsEqualMethod(S, LHS.get(), RHS.get())) {
10344 SourceLocation Start = LHS.get()->getBeginLoc();
10345 SourceLocation End = S.getLocForEndOfToken(RHS.get()->getEndLoc());
10346 CharSourceRange OpRange =
10347 CharSourceRange::getCharRange(Loc, S.getLocForEndOfToken(Loc));
10348
10349 S.Diag(Loc, diag::note_objc_literal_comparison_isequal)
10350 << FixItHint::CreateInsertion(Start, Opc == BO_EQ ? "[" : "![")
10351 << FixItHint::CreateReplacement(OpRange, " isEqual:")
10352 << FixItHint::CreateInsertion(End, "]");
10353 }
10354 }
10355
10356 /// Warns on !x < y, !x & y where !(x < y), !(x & y) was probably intended.
10357 static void diagnoseLogicalNotOnLHSofCheck(Sema &S, ExprResult &LHS,
10358 ExprResult &RHS, SourceLocation Loc,
10359 BinaryOperatorKind Opc) {
10360 // Check that left hand side is !something.
10361 UnaryOperator *UO = dyn_cast<UnaryOperator>(LHS.get()->IgnoreImpCasts());
10362 if (!UO || UO->getOpcode() != UO_LNot) return;
10363
10364 // Only check if the right hand side is non-bool arithmetic type.
10365 if (RHS.get()->isKnownToHaveBooleanValue()) return;
10366
10367 // Make sure that the something in !something is not bool.
10368 Expr *SubExpr = UO->getSubExpr()->IgnoreImpCasts();
10369 if (SubExpr->isKnownToHaveBooleanValue()) return;
10370
10371 // Emit warning.
10372 bool IsBitwiseOp = Opc == BO_And || Opc == BO_Or || Opc == BO_Xor;
10373 S.Diag(UO->getOperatorLoc(), diag::warn_logical_not_on_lhs_of_check)
10374 << Loc << IsBitwiseOp;
10375
10376 // First note suggest !(x < y)
10377 SourceLocation FirstOpen = SubExpr->getBeginLoc();
10378 SourceLocation FirstClose = RHS.get()->getEndLoc();
10379 FirstClose = S.getLocForEndOfToken(FirstClose);
10380 if (FirstClose.isInvalid())
10381 FirstOpen = SourceLocation();
10382 S.Diag(UO->getOperatorLoc(), diag::note_logical_not_fix)
10383 << IsBitwiseOp
10384 << FixItHint::CreateInsertion(FirstOpen, "(")
10385 << FixItHint::CreateInsertion(FirstClose, ")");
10386
10387 // Second note suggests (!x) < y
10388 SourceLocation SecondOpen = LHS.get()->getBeginLoc();
10389 SourceLocation SecondClose = LHS.get()->getEndLoc();
10390 SecondClose = S.getLocForEndOfToken(SecondClose);
10391 if (SecondClose.isInvalid())
10392 SecondOpen = SourceLocation();
10393 S.Diag(UO->getOperatorLoc(), diag::note_logical_not_silence_with_parens)
10394 << FixItHint::CreateInsertion(SecondOpen, "(")
10395 << FixItHint::CreateInsertion(SecondClose, ")");
10396 }
10397
10398 // Returns true if E refers to a non-weak array.
10399 static bool checkForArray(const Expr *E) {
10400 const ValueDecl *D = nullptr;
10401 if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E)) {
10402 D = DR->getDecl();
10403 } else if (const MemberExpr *Mem = dyn_cast<MemberExpr>(E)) {
10404 if (Mem->isImplicitAccess())
10405 D = Mem->getMemberDecl();
10406 }
10407 if (!D)
10408 return false;
10409 return D->getType()->isArrayType() && !D->isWeak();
10410 }
10411
10412 /// Diagnose some forms of syntactically-obvious tautological comparison.
10413 static void diagnoseTautologicalComparison(Sema &S, SourceLocation Loc,
10414 Expr *LHS, Expr *RHS,
10415 BinaryOperatorKind Opc) {
10416 Expr *LHSStripped = LHS->IgnoreParenImpCasts();
10417 Expr *RHSStripped = RHS->IgnoreParenImpCasts();
10418
10419 QualType LHSType = LHS->getType();
10420 QualType RHSType = RHS->getType();
10421 if (LHSType->hasFloatingRepresentation() ||
10422 (LHSType->isBlockPointerType() && !BinaryOperator::isEqualityOp(Opc)) ||
10423 S.inTemplateInstantiation())
10424 return;
10425
10426 // Comparisons between two array types are ill-formed for operator<=>, so
10427 // we shouldn't emit any additional warnings about it.
10428 if (Opc == BO_Cmp && LHSType->isArrayType() && RHSType->isArrayType())
10429 return;
10430
10431 // For non-floating point types, check for self-comparisons of the form
10432 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
10433 // often indicate logic errors in the program.
10434 //
10435 // NOTE: Don't warn about comparison expressions resulting from macro
10436 // expansion. Also don't warn about comparisons which are only self
10437 // comparisons within a template instantiation. The warnings should catch
10438 // obvious cases in the definition of the template anyways. The idea is to
10439 // warn when the typed comparison operator will always evaluate to the same
10440 // result.
10441
10442 // Used for indexing into %select in warn_comparison_always
10443 enum {
10444 AlwaysConstant,
10445 AlwaysTrue,
10446 AlwaysFalse,
10447 AlwaysEqual, // std::strong_ordering::equal from operator<=>
10448 };
10449
10450 // C++2a [depr.array.comp]:
10451 // Equality and relational comparisons ([expr.eq], [expr.rel]) between two
10452 // operands of array type are deprecated.
10453 if (S.getLangOpts().CPlusPlus2a && LHSStripped->getType()->isArrayType() &&
10454 RHSStripped->getType()->isArrayType()) {
10455 S.Diag(Loc, diag::warn_depr_array_comparison)
10456 << LHS->getSourceRange() << RHS->getSourceRange()
10457 << LHSStripped->getType() << RHSStripped->getType();
10458 // Carry on to produce the tautological comparison warning, if this
10459 // expression is potentially-evaluated, we can resolve the array to a
10460 // non-weak declaration, and so on.
10461 }
10462
10463 if (!LHS->getBeginLoc().isMacroID() && !RHS->getBeginLoc().isMacroID()) {
10464 if (Expr::isSameComparisonOperand(LHS, RHS)) {
10465 unsigned Result;
10466 switch (Opc) {
10467 case BO_EQ:
10468 case BO_LE:
10469 case BO_GE:
10470 Result = AlwaysTrue;
10471 break;
10472 case BO_NE:
10473 case BO_LT:
10474 case BO_GT:
10475 Result = AlwaysFalse;
10476 break;
10477 case BO_Cmp:
10478 Result = AlwaysEqual;
10479 break;
10480 default:
10481 Result = AlwaysConstant;
10482 break;
10483 }
10484 S.DiagRuntimeBehavior(Loc, nullptr,
10485 S.PDiag(diag::warn_comparison_always)
10486 << 0 /*self-comparison*/
10487 << Result);
10488 } else if (checkForArray(LHSStripped) && checkForArray(RHSStripped)) {
10489 // What is it always going to evaluate to?
10490 unsigned Result;
10491 switch (Opc) {
10492 case BO_EQ: // e.g. array1 == array2
10493 Result = AlwaysFalse;
10494 break;
10495 case BO_NE: // e.g. array1 != array2
10496 Result = AlwaysTrue;
10497 break;
10498 default: // e.g. array1 <= array2
10499 // The best we can say is 'a constant'
10500 Result = AlwaysConstant;
10501 break;
10502 }
10503 S.DiagRuntimeBehavior(Loc, nullptr,
10504 S.PDiag(diag::warn_comparison_always)
10505 << 1 /*array comparison*/
10506 << Result);
10507 }
10508 }
10509
10510 if (isa<CastExpr>(LHSStripped))
10511 LHSStripped = LHSStripped->IgnoreParenCasts();
10512 if (isa<CastExpr>(RHSStripped))
10513 RHSStripped = RHSStripped->IgnoreParenCasts();
10514
10515 // Warn about comparisons against a string constant (unless the other
10516 // operand is null); the user probably wants string comparison function.
10517 Expr *LiteralString = nullptr;
10518 Expr *LiteralStringStripped = nullptr;
10519 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
10520 !RHSStripped->isNullPointerConstant(S.Context,
10521 Expr::NPC_ValueDependentIsNull)) {
10522 LiteralString = LHS;
10523 LiteralStringStripped = LHSStripped;
10524 } else if ((isa<StringLiteral>(RHSStripped) ||
10525 isa<ObjCEncodeExpr>(RHSStripped)) &&
10526 !LHSStripped->isNullPointerConstant(S.Context,
10527 Expr::NPC_ValueDependentIsNull)) {
10528 LiteralString = RHS;
10529 LiteralStringStripped = RHSStripped;
10530 }
10531
10532 if (LiteralString) {
10533 S.DiagRuntimeBehavior(Loc, nullptr,
10534 S.PDiag(diag::warn_stringcompare)
10535 << isa<ObjCEncodeExpr>(LiteralStringStripped)
10536 << LiteralString->getSourceRange());
10537 }
10538 }
10539
10540 static ImplicitConversionKind castKindToImplicitConversionKind(CastKind CK) {
10541 switch (CK) {
10542 default: {
10543 #ifndef NDEBUG
10544 llvm::errs() << "unhandled cast kind: " << CastExpr::getCastKindName(CK)
10545 << "\n";
10546 #endif
10547 llvm_unreachable("unhandled cast kind");
10548 }
10549 case CK_UserDefinedConversion:
10550 return ICK_Identity;
10551 case CK_LValueToRValue:
10552 return ICK_Lvalue_To_Rvalue;
10553 case CK_ArrayToPointerDecay:
10554 return ICK_Array_To_Pointer;
10555 case CK_FunctionToPointerDecay:
10556 return ICK_Function_To_Pointer;
10557 case CK_IntegralCast:
10558 return ICK_Integral_Conversion;
10559 case CK_FloatingCast:
10560 return ICK_Floating_Conversion;
10561 case CK_IntegralToFloating:
10562 case CK_FloatingToIntegral:
10563 return ICK_Floating_Integral;
10564 case CK_IntegralComplexCast:
10565 case CK_FloatingComplexCast:
10566 case CK_FloatingComplexToIntegralComplex:
10567 case CK_IntegralComplexToFloatingComplex:
10568 return ICK_Complex_Conversion;
10569 case CK_FloatingComplexToReal:
10570 case CK_FloatingRealToComplex:
10571 case CK_IntegralComplexToReal:
10572 case CK_IntegralRealToComplex:
10573 return ICK_Complex_Real;
10574 }
10575 }
10576
10577 static bool checkThreeWayNarrowingConversion(Sema &S, QualType ToType, Expr *E,
10578 QualType FromType,
10579 SourceLocation Loc) {
10580 // Check for a narrowing implicit conversion.
10581 StandardConversionSequence SCS;
10582 SCS.setAsIdentityConversion();
10583 SCS.setToType(0, FromType);
10584 SCS.setToType(1, ToType);
10585 if (const auto *ICE = dyn_cast<ImplicitCastExpr>(E))
10586 SCS.Second = castKindToImplicitConversionKind(ICE->getCastKind());
10587
10588 APValue PreNarrowingValue;
10589 QualType PreNarrowingType;
10590 switch (SCS.getNarrowingKind(S.Context, E, PreNarrowingValue,
10591 PreNarrowingType,
10592 /*IgnoreFloatToIntegralConversion*/ true)) {
10593 case NK_Dependent_Narrowing:
10594 // Implicit conversion to a narrower type, but the expression is
10595 // value-dependent so we can't tell whether it's actually narrowing.
10596 case NK_Not_Narrowing:
10597 return false;
10598
10599 case NK_Constant_Narrowing:
10600 // Implicit conversion to a narrower type, and the value is not a constant
10601 // expression.
10602 S.Diag(E->getBeginLoc(), diag::err_spaceship_argument_narrowing)
10603 << /*Constant*/ 1
10604 << PreNarrowingValue.getAsString(S.Context, PreNarrowingType) << ToType;
10605 return true;
10606
10607 case NK_Variable_Narrowing:
10608 // Implicit conversion to a narrower type, and the value is not a constant
10609 // expression.
10610 case NK_Type_Narrowing:
10611 S.Diag(E->getBeginLoc(), diag::err_spaceship_argument_narrowing)
10612 << /*Constant*/ 0 << FromType << ToType;
10613 // TODO: It's not a constant expression, but what if the user intended it
10614 // to be? Can we produce notes to help them figure out why it isn't?
10615 return true;
10616 }
10617 llvm_unreachable("unhandled case in switch");
10618 }
10619
10620 static QualType checkArithmeticOrEnumeralThreeWayCompare(Sema &S,
10621 ExprResult &LHS,
10622 ExprResult &RHS,
10623 SourceLocation Loc) {
10624 QualType LHSType = LHS.get()->getType();
10625 QualType RHSType = RHS.get()->getType();
10626 // Dig out the original argument type and expression before implicit casts
10627 // were applied. These are the types/expressions we need to check the
10628 // [expr.spaceship] requirements against.
10629 ExprResult LHSStripped = LHS.get()->IgnoreParenImpCasts();
10630 ExprResult RHSStripped = RHS.get()->IgnoreParenImpCasts();
10631 QualType LHSStrippedType = LHSStripped.get()->getType();
10632 QualType RHSStrippedType = RHSStripped.get()->getType();
10633
10634 // C++2a [expr.spaceship]p3: If one of the operands is of type bool and the
10635 // other is not, the program is ill-formed.
10636 if (LHSStrippedType->isBooleanType() != RHSStrippedType->isBooleanType()) {
10637 S.InvalidOperands(Loc, LHSStripped, RHSStripped);
10638 return QualType();
10639 }
10640
10641 // FIXME: Consider combining this with checkEnumArithmeticConversions.
10642 int NumEnumArgs = (int)LHSStrippedType->isEnumeralType() +
10643 RHSStrippedType->isEnumeralType();
10644 if (NumEnumArgs == 1) {
10645 bool LHSIsEnum = LHSStrippedType->isEnumeralType();
10646 QualType OtherTy = LHSIsEnum ? RHSStrippedType : LHSStrippedType;
10647 if (OtherTy->hasFloatingRepresentation()) {
10648 S.InvalidOperands(Loc, LHSStripped, RHSStripped);
10649 return QualType();
10650 }
10651 }
10652 if (NumEnumArgs == 2) {
10653 // C++2a [expr.spaceship]p5: If both operands have the same enumeration
10654 // type E, the operator yields the result of converting the operands
10655 // to the underlying type of E and applying <=> to the converted operands.
10656 if (!S.Context.hasSameUnqualifiedType(LHSStrippedType, RHSStrippedType)) {
10657 S.InvalidOperands(Loc, LHS, RHS);
10658 return QualType();
10659 }
10660 QualType IntType =
10661 LHSStrippedType->castAs<EnumType>()->getDecl()->getIntegerType();
10662 assert(IntType->isArithmeticType());
10663
10664 // We can't use `CK_IntegralCast` when the underlying type is 'bool', so we
10665 // promote the boolean type, and all other promotable integer types, to
10666 // avoid this.
10667 if (IntType->isPromotableIntegerType())
10668 IntType = S.Context.getPromotedIntegerType(IntType);
10669
10670 LHS = S.ImpCastExprToType(LHS.get(), IntType, CK_IntegralCast);
10671 RHS = S.ImpCastExprToType(RHS.get(), IntType, CK_IntegralCast);
10672 LHSType = RHSType = IntType;
10673 }
10674
10675 // C++2a [expr.spaceship]p4: If both operands have arithmetic types, the
10676 // usual arithmetic conversions are applied to the operands.
10677 QualType Type =
10678 S.UsualArithmeticConversions(LHS, RHS, Loc, Sema::ACK_Comparison);
10679 if (LHS.isInvalid() || RHS.isInvalid())
10680 return QualType();
10681 if (Type.isNull())
10682 return S.InvalidOperands(Loc, LHS, RHS);
10683
10684 Optional<ComparisonCategoryType> CCT =
10685 getComparisonCategoryForBuiltinCmp(Type);
10686 if (!CCT)
10687 return S.InvalidOperands(Loc, LHS, RHS);
10688
10689 bool HasNarrowing = checkThreeWayNarrowingConversion(
10690 S, Type, LHS.get(), LHSType, LHS.get()->getBeginLoc());
10691 HasNarrowing |= checkThreeWayNarrowingConversion(S, Type, RHS.get(), RHSType,
10692 RHS.get()->getBeginLoc());
10693 if (HasNarrowing)
10694 return QualType();
10695
10696 assert(!Type.isNull() && "composite type for <=> has not been set");
10697
10698 return S.CheckComparisonCategoryType(
10699 *CCT, Loc, Sema::ComparisonCategoryUsage::OperatorInExpression);
10700 }
10701
10702 static QualType checkArithmeticOrEnumeralCompare(Sema &S, ExprResult &LHS,
10703 ExprResult &RHS,
10704 SourceLocation Loc,
10705 BinaryOperatorKind Opc) {
10706 if (Opc == BO_Cmp)
10707 return checkArithmeticOrEnumeralThreeWayCompare(S, LHS, RHS, Loc);
10708
10709 // C99 6.5.8p3 / C99 6.5.9p4
10710 QualType Type =
10711 S.UsualArithmeticConversions(LHS, RHS, Loc, Sema::ACK_Comparison);
10712 if (LHS.isInvalid() || RHS.isInvalid())
10713 return QualType();
10714 if (Type.isNull())
10715 return S.InvalidOperands(Loc, LHS, RHS);
10716 assert(Type->isArithmeticType() || Type->isEnumeralType());
10717
10718 if (Type->isAnyComplexType() && BinaryOperator::isRelationalOp(Opc))
10719 return S.InvalidOperands(Loc, LHS, RHS);
10720
10721 // Check for comparisons of floating point operands using != and ==.
10722 if (Type->hasFloatingRepresentation() && BinaryOperator::isEqualityOp(Opc))
10723 S.CheckFloatComparison(Loc, LHS.get(), RHS.get());
10724
10725 // The result of comparisons is 'bool' in C++, 'int' in C.
10726 return S.Context.getLogicalOperationType();
10727 }
10728
10729 void Sema::CheckPtrComparisonWithNullChar(ExprResult &E, ExprResult &NullE) {
10730 if (!NullE.get()->getType()->isAnyPointerType())
10731 return;
10732 int NullValue = PP.isMacroDefined("NULL") ? 0 : 1;
10733 if (!E.get()->getType()->isAnyPointerType() &&
10734 E.get()->isNullPointerConstant(Context,
10735 Expr::NPC_ValueDependentIsNotNull) ==
10736 Expr::NPCK_ZeroExpression) {
10737 if (const auto *CL = dyn_cast<CharacterLiteral>(E.get())) {
10738 if (CL->getValue() == 0)
10739 Diag(E.get()->getExprLoc(), diag::warn_pointer_compare)
10740 << NullValue
10741 << FixItHint::CreateReplacement(E.get()->getExprLoc(),
10742 NullValue ? "NULL" : "(void *)0");
10743 } else if (const auto *CE = dyn_cast<CStyleCastExpr>(E.get())) {
10744 TypeSourceInfo *TI = CE->getTypeInfoAsWritten();
10745 QualType T = Context.getCanonicalType(TI->getType()).getUnqualifiedType();
10746 if (T == Context.CharTy)
10747 Diag(E.get()->getExprLoc(), diag::warn_pointer_compare)
10748 << NullValue
10749 << FixItHint::CreateReplacement(E.get()->getExprLoc(),
10750 NullValue ? "NULL" : "(void *)0");
10751 }
10752 }
10753 }
10754
10755 // C99 6.5.8, C++ [expr.rel]
10756 QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
10757 SourceLocation Loc,
10758 BinaryOperatorKind Opc) {
10759 bool IsRelational = BinaryOperator::isRelationalOp(Opc);
10760 bool IsThreeWay = Opc == BO_Cmp;
10761 bool IsOrdered = IsRelational || IsThreeWay;
10762 auto IsAnyPointerType = [](ExprResult E) {
10763 QualType Ty = E.get()->getType();
10764 return Ty->isPointerType() || Ty->isMemberPointerType();
10765 };
10766
10767 // C++2a [expr.spaceship]p6: If at least one of the operands is of pointer
10768 // type, array-to-pointer, ..., conversions are performed on both operands to
10769 // bring them to their composite type.
10770 // Otherwise, all comparisons expect an rvalue, so convert to rvalue before
10771 // any type-related checks.
10772 if (!IsThreeWay || IsAnyPointerType(LHS) || IsAnyPointerType(RHS)) {
10773 LHS = DefaultFunctionArrayLvalueConversion(LHS.get());
10774 if (LHS.isInvalid())
10775 return QualType();
10776 RHS = DefaultFunctionArrayLvalueConversion(RHS.get());
10777 if (RHS.isInvalid())
10778 return QualType();
10779 } else {
10780 LHS = DefaultLvalueConversion(LHS.get());
10781 if (LHS.isInvalid())
10782 return QualType();
10783 RHS = DefaultLvalueConversion(RHS.get());
10784 if (RHS.isInvalid())
10785 return QualType();
10786 }
10787
10788 checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/true);
10789 if (!getLangOpts().CPlusPlus && BinaryOperator::isEqualityOp(Opc)) {
10790 CheckPtrComparisonWithNullChar(LHS, RHS);
10791 CheckPtrComparisonWithNullChar(RHS, LHS);
10792 }
10793
10794 // Handle vector comparisons separately.
10795 if (LHS.get()->getType()->isVectorType() ||
10796 RHS.get()->getType()->isVectorType())
10797 return CheckVectorCompareOperands(LHS, RHS, Loc, Opc);
10798
10799 diagnoseLogicalNotOnLHSofCheck(*this, LHS, RHS, Loc, Opc);
10800 diagnoseTautologicalComparison(*this, Loc, LHS.get(), RHS.get(), Opc);
10801
10802 QualType LHSType = LHS.get()->getType();
10803 QualType RHSType = RHS.get()->getType();
10804 if ((LHSType->isArithmeticType() || LHSType->isEnumeralType()) &&
10805 (RHSType->isArithmeticType() || RHSType->isEnumeralType()))
10806 return checkArithmeticOrEnumeralCompare(*this, LHS, RHS, Loc, Opc);
10807
10808 const Expr::NullPointerConstantKind LHSNullKind =
10809 LHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull);
10810 const Expr::NullPointerConstantKind RHSNullKind =
10811 RHS.get()->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull);
10812 bool LHSIsNull = LHSNullKind != Expr::NPCK_NotNull;
10813 bool RHSIsNull = RHSNullKind != Expr::NPCK_NotNull;
10814
10815 auto computeResultTy = [&]() {
10816 if (Opc != BO_Cmp)
10817 return Context.getLogicalOperationType();
10818 assert(getLangOpts().CPlusPlus);
10819 assert(Context.hasSameType(LHS.get()->getType(), RHS.get()->getType()));
10820
10821 QualType CompositeTy = LHS.get()->getType();
10822 assert(!CompositeTy->isReferenceType());
10823
10824 Optional<ComparisonCategoryType> CCT =
10825 getComparisonCategoryForBuiltinCmp(CompositeTy);
10826 if (!CCT)
10827 return InvalidOperands(Loc, LHS, RHS);
10828
10829 if (CompositeTy->isPointerType() && LHSIsNull != RHSIsNull) {
10830 // P0946R0: Comparisons between a null pointer constant and an object
10831 // pointer result in std::strong_equality, which is ill-formed under
10832 // P1959R0.
10833 Diag(Loc, diag::err_typecheck_three_way_comparison_of_pointer_and_zero)
10834 << (LHSIsNull ? LHS.get()->getSourceRange()
10835 : RHS.get()->getSourceRange());
10836 return QualType();
10837 }
10838
10839 return CheckComparisonCategoryType(
10840 *CCT, Loc, ComparisonCategoryUsage::OperatorInExpression);
10841 };
10842
10843 if (!IsOrdered && LHSIsNull != RHSIsNull) {
10844 bool IsEquality = Opc == BO_EQ;
10845 if (RHSIsNull)
10846 DiagnoseAlwaysNonNullPointer(LHS.get(), RHSNullKind, IsEquality,
10847 RHS.get()->getSourceRange());
10848 else
10849 DiagnoseAlwaysNonNullPointer(RHS.get(), LHSNullKind, IsEquality,
10850 LHS.get()->getSourceRange());
10851 }
10852
10853 if ((LHSType->isIntegerType() && !LHSIsNull) ||
10854 (RHSType->isIntegerType() && !RHSIsNull)) {
10855 // Skip normal pointer conversion checks in this case; we have better
10856 // diagnostics for this below.
10857 } else if (getLangOpts().CPlusPlus) {
10858 // Equality comparison of a function pointer to a void pointer is invalid,
10859 // but we allow it as an extension.
10860 // FIXME: If we really want to allow this, should it be part of composite
10861 // pointer type computation so it works in conditionals too?
10862 if (!IsOrdered &&
10863 ((LHSType->isFunctionPointerType() && RHSType->isVoidPointerType()) ||
10864 (RHSType->isFunctionPointerType() && LHSType->isVoidPointerType()))) {
10865 // This is a gcc extension compatibility comparison.
10866 // In a SFINAE context, we treat this as a hard error to maintain
10867 // conformance with the C++ standard.
10868 diagnoseFunctionPointerToVoidComparison(
10869 *this, Loc, LHS, RHS, /*isError*/ (bool)isSFINAEContext());
10870
10871 if (isSFINAEContext())
10872 return QualType();
10873
10874 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
10875 return computeResultTy();
10876 }
10877
10878 // C++ [expr.eq]p2:
10879 // If at least one operand is a pointer [...] bring them to their
10880 // composite pointer type.
10881 // C++ [expr.spaceship]p6
10882 // If at least one of the operands is of pointer type, [...] bring them
10883 // to their composite pointer type.
10884 // C++ [expr.rel]p2:
10885 // If both operands are pointers, [...] bring them to their composite
10886 // pointer type.
10887 // For <=>, the only valid non-pointer types are arrays and functions, and
10888 // we already decayed those, so this is really the same as the relational
10889 // comparison rule.
10890 if ((int)LHSType->isPointerType() + (int)RHSType->isPointerType() >=
10891 (IsOrdered ? 2 : 1) &&
10892 (!LangOpts.ObjCAutoRefCount || !(LHSType->isObjCObjectPointerType() ||
10893 RHSType->isObjCObjectPointerType()))) {
10894 if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
10895 return QualType();
10896 return computeResultTy();
10897 }
10898 } else if (LHSType->isPointerType() &&
10899 RHSType->isPointerType()) { // C99 6.5.8p2
10900 // All of the following pointer-related warnings are GCC extensions, except
10901 // when handling null pointer constants.
10902 QualType LCanPointeeTy =
10903 LHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
10904 QualType RCanPointeeTy =
10905 RHSType->castAs<PointerType>()->getPointeeType().getCanonicalType();
10906
10907 // C99 6.5.9p2 and C99 6.5.8p2
10908 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
10909 RCanPointeeTy.getUnqualifiedType())) {
10910 // Valid unless a relational comparison of function pointers
10911 if (IsRelational && LCanPointeeTy->isFunctionType()) {
10912 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers)
10913 << LHSType << RHSType << LHS.get()->getSourceRange()
10914 << RHS.get()->getSourceRange();
10915 }
10916 } else if (!IsRelational &&
10917 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
10918 // Valid unless comparison between non-null pointer and function pointer
10919 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
10920 && !LHSIsNull && !RHSIsNull)
10921 diagnoseFunctionPointerToVoidComparison(*this, Loc, LHS, RHS,
10922 /*isError*/false);
10923 } else {
10924 // Invalid
10925 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS, /*isError*/false);
10926 }
10927 if (LCanPointeeTy != RCanPointeeTy) {
10928 // Treat NULL constant as a special case in OpenCL.
10929 if (getLangOpts().OpenCL && !LHSIsNull && !RHSIsNull) {
10930 const PointerType *LHSPtr = LHSType->castAs<PointerType>();
10931 if (!LHSPtr->isAddressSpaceOverlapping(*RHSType->castAs<PointerType>())) {
10932 Diag(Loc,
10933 diag::err_typecheck_op_on_nonoverlapping_address_space_pointers)
10934 << LHSType << RHSType << 0 /* comparison */
10935 << LHS.get()->getSourceRange() << RHS.get()->getSourceRange();
10936 }
10937 }
10938 LangAS AddrSpaceL = LCanPointeeTy.getAddressSpace();
10939 LangAS AddrSpaceR = RCanPointeeTy.getAddressSpace();
10940 CastKind Kind = AddrSpaceL != AddrSpaceR ? CK_AddressSpaceConversion
10941 : CK_BitCast;
10942 if (LHSIsNull && !RHSIsNull)
10943 LHS = ImpCastExprToType(LHS.get(), RHSType, Kind);
10944 else
10945 RHS = ImpCastExprToType(RHS.get(), LHSType, Kind);
10946 }
10947 return computeResultTy();
10948 }
10949
10950 if (getLangOpts().CPlusPlus) {
10951 // C++ [expr.eq]p4:
10952 // Two operands of type std::nullptr_t or one operand of type
10953 // std::nullptr_t and the other a null pointer constant compare equal.
10954 if (!IsOrdered && LHSIsNull && RHSIsNull) {
10955 if (LHSType->isNullPtrType()) {
10956 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
10957 return computeResultTy();
10958 }
10959 if (RHSType->isNullPtrType()) {
10960 LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
10961 return computeResultTy();
10962 }
10963 }
10964
10965 // Comparison of Objective-C pointers and block pointers against nullptr_t.
10966 // These aren't covered by the composite pointer type rules.
10967 if (!IsOrdered && RHSType->isNullPtrType() &&
10968 (LHSType->isObjCObjectPointerType() || LHSType->isBlockPointerType())) {
10969 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
10970 return computeResultTy();
10971 }
10972 if (!IsOrdered && LHSType->isNullPtrType() &&
10973 (RHSType->isObjCObjectPointerType() || RHSType->isBlockPointerType())) {
10974 LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
10975 return computeResultTy();
10976 }
10977
10978 if (IsRelational &&
10979 ((LHSType->isNullPtrType() && RHSType->isPointerType()) ||
10980 (RHSType->isNullPtrType() && LHSType->isPointerType()))) {
10981 // HACK: Relational comparison of nullptr_t against a pointer type is
10982 // invalid per DR583, but we allow it within std::less<> and friends,
10983 // since otherwise common uses of it break.
10984 // FIXME: Consider removing this hack once LWG fixes std::less<> and
10985 // friends to have std::nullptr_t overload candidates.
10986 DeclContext *DC = CurContext;
10987 if (isa<FunctionDecl>(DC))
10988 DC = DC->getParent();
10989 if (auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
10990 if (CTSD->isInStdNamespace() &&
10991 llvm::StringSwitch<bool>(CTSD->getName())
10992 .Cases("less", "less_equal", "greater", "greater_equal", true)
10993 .Default(false)) {
10994 if (RHSType->isNullPtrType())
10995 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
10996 else
10997 LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
10998 return computeResultTy();
10999 }
11000 }
11001 }
11002
11003 // C++ [expr.eq]p2:
11004 // If at least one operand is a pointer to member, [...] bring them to
11005 // their composite pointer type.
11006 if (!IsOrdered &&
11007 (LHSType->isMemberPointerType() || RHSType->isMemberPointerType())) {
11008 if (convertPointersToCompositeType(*this, Loc, LHS, RHS))
11009 return QualType();
11010 else
11011 return computeResultTy();
11012 }
11013 }
11014
11015 // Handle block pointer types.
11016 if (!IsOrdered && LHSType->isBlockPointerType() &&
11017 RHSType->isBlockPointerType()) {
11018 QualType lpointee = LHSType->castAs<BlockPointerType>()->getPointeeType();
11019 QualType rpointee = RHSType->castAs<BlockPointerType>()->getPointeeType();
11020
11021 if (!LHSIsNull && !RHSIsNull &&
11022 !Context.typesAreCompatible(lpointee, rpointee)) {
11023 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
11024 << LHSType << RHSType << LHS.get()->getSourceRange()
11025 << RHS.get()->getSourceRange();
11026 }
11027 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
11028 return computeResultTy();
11029 }
11030
11031 // Allow block pointers to be compared with null pointer constants.
11032 if (!IsOrdered
11033 && ((LHSType->isBlockPointerType() && RHSType->isPointerType())
11034 || (LHSType->isPointerType() && RHSType->isBlockPointerType()))) {
11035 if (!LHSIsNull && !RHSIsNull) {
11036 if (!((RHSType->isPointerType() && RHSType->castAs<PointerType>()
11037 ->getPointeeType()->isVoidType())
11038 || (LHSType->isPointerType() && LHSType->castAs<PointerType>()
11039 ->getPointeeType()->isVoidType())))
11040 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
11041 << LHSType << RHSType << LHS.get()->getSourceRange()
11042 << RHS.get()->getSourceRange();
11043 }
11044 if (LHSIsNull && !RHSIsNull)
11045 LHS = ImpCastExprToType(LHS.get(), RHSType,
11046 RHSType->isPointerType() ? CK_BitCast
11047 : CK_AnyPointerToBlockPointerCast);
11048 else
11049 RHS = ImpCastExprToType(RHS.get(), LHSType,
11050 LHSType->isPointerType() ? CK_BitCast
11051 : CK_AnyPointerToBlockPointerCast);
11052 return computeResultTy();
11053 }
11054
11055 if (LHSType->isObjCObjectPointerType() ||
11056 RHSType->isObjCObjectPointerType()) {
11057 const PointerType *LPT = LHSType->getAs<PointerType>();
11058 const PointerType *RPT = RHSType->getAs<PointerType>();
11059 if (LPT || RPT) {
11060 bool LPtrToVoid = LPT ? LPT->getPointeeType()->isVoidType() : false;
11061 bool RPtrToVoid = RPT ? RPT->getPointeeType()->isVoidType() : false;
11062
11063 if (!LPtrToVoid && !RPtrToVoid &&
11064 !Context.typesAreCompatible(LHSType, RHSType)) {
11065 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
11066 /*isError*/false);
11067 }
11068 // FIXME: If LPtrToVoid, we should presumably convert the LHS rather than
11069 // the RHS, but we have test coverage for this behavior.
11070 // FIXME: Consider using convertPointersToCompositeType in C++.
11071 if (LHSIsNull && !RHSIsNull) {
11072 Expr *E = LHS.get();
11073 if (getLangOpts().ObjCAutoRefCount)
11074 CheckObjCConversion(SourceRange(), RHSType, E,
11075 CCK_ImplicitConversion);
11076 LHS = ImpCastExprToType(E, RHSType,
11077 RPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
11078 }
11079 else {
11080 Expr *E = RHS.get();
11081 if (getLangOpts().ObjCAutoRefCount)
11082 CheckObjCConversion(SourceRange(), LHSType, E, CCK_ImplicitConversion,
11083 /*Diagnose=*/true,
11084 /*DiagnoseCFAudited=*/false, Opc);
11085 RHS = ImpCastExprToType(E, LHSType,
11086 LPT ? CK_BitCast :CK_CPointerToObjCPointerCast);
11087 }
11088 return computeResultTy();
11089 }
11090 if (LHSType->isObjCObjectPointerType() &&
11091 RHSType->isObjCObjectPointerType()) {
11092 if (!Context.areComparableObjCPointerTypes(LHSType, RHSType))
11093 diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
11094 /*isError*/false);
11095 if (isObjCObjectLiteral(LHS) || isObjCObjectLiteral(RHS))
11096 diagnoseObjCLiteralComparison(*this, Loc, LHS, RHS, Opc);
11097
11098 if (LHSIsNull && !RHSIsNull)
11099 LHS = ImpCastExprToType(LHS.get(), RHSType, CK_BitCast);
11100 else
11101 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_BitCast);
11102 return computeResultTy();
11103 }
11104
11105 if (!IsOrdered && LHSType->isBlockPointerType() &&
11106 RHSType->isBlockCompatibleObjCPointerType(Context)) {
11107 LHS = ImpCastExprToType(LHS.get(), RHSType,
11108 CK_BlockPointerToObjCPointerCast);
11109 return computeResultTy();
11110 } else if (!IsOrdered &&
11111 LHSType->isBlockCompatibleObjCPointerType(Context) &&
11112 RHSType->isBlockPointerType()) {
11113 RHS = ImpCastExprToType(RHS.get(), LHSType,
11114 CK_BlockPointerToObjCPointerCast);
11115 return computeResultTy();
11116 }
11117 }
11118 if ((LHSType->isAnyPointerType() && RHSType->isIntegerType()) ||
11119 (LHSType->isIntegerType() && RHSType->isAnyPointerType())) {
11120 unsigned DiagID = 0;
11121 bool isError = false;
11122 if (LangOpts.DebuggerSupport) {
11123 // Under a debugger, allow the comparison of pointers to integers,
11124 // since users tend to want to compare addresses.
11125 } else if ((LHSIsNull && LHSType->isIntegerType()) ||
11126 (RHSIsNull && RHSType->isIntegerType())) {
11127 if (IsOrdered) {
11128 isError = getLangOpts().CPlusPlus;
11129 DiagID =
11130 isError ? diag::err_typecheck_ordered_comparison_of_pointer_and_zero
11131 : diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
11132 }
11133 } else if (getLangOpts().CPlusPlus) {
11134 DiagID = diag::err_typecheck_comparison_of_pointer_integer;
11135 isError = true;
11136 } else if (IsOrdered)
11137 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
11138 else
11139 DiagID = diag::ext_typecheck_comparison_of_pointer_integer;
11140
11141 if (DiagID) {
11142 Diag(Loc, DiagID)
11143 << LHSType << RHSType << LHS.get()->getSourceRange()
11144 << RHS.get()->getSourceRange();
11145 if (isError)
11146 return QualType();
11147 }
11148
11149 if (LHSType->isIntegerType())
11150 LHS = ImpCastExprToType(LHS.get(), RHSType,
11151 LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
11152 else
11153 RHS = ImpCastExprToType(RHS.get(), LHSType,
11154 RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
11155 return computeResultTy();
11156 }
11157
11158 // Handle block pointers.
11159 if (!IsOrdered && RHSIsNull
11160 && LHSType->isBlockPointerType() && RHSType->isIntegerType()) {
11161 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
11162 return computeResultTy();
11163 }
11164 if (!IsOrdered && LHSIsNull
11165 && LHSType->isIntegerType() && RHSType->isBlockPointerType()) {
11166 LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
11167 return computeResultTy();
11168 }
11169
11170 if (getLangOpts().OpenCLVersion >= 200 || getLangOpts().OpenCLCPlusPlus) {
11171 if (LHSType->isClkEventT() && RHSType->isClkEventT()) {
11172 return computeResultTy();
11173 }
11174
11175 if (LHSType->isQueueT() && RHSType->isQueueT()) {
11176 return computeResultTy();
11177 }
11178
11179 if (LHSIsNull && RHSType->isQueueT()) {
11180 LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
11181 return computeResultTy();
11182 }
11183
11184 if (LHSType->isQueueT() && RHSIsNull) {
11185 RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
11186 return computeResultTy();
11187 }
11188 }
11189
11190 return InvalidOperands(Loc, LHS, RHS);
11191 }
11192
11193 // Return a signed ext_vector_type that is of identical size and number of
11194 // elements. For floating point vectors, return an integer type of identical
11195 // size and number of elements. In the non ext_vector_type case, search from
11196 // the largest type to the smallest type to avoid cases where long long == long,
11197 // where long gets picked over long long.
11198 QualType Sema::GetSignedVectorType(QualType V) {
11199 const VectorType *VTy = V->castAs<VectorType>();
11200 unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
11201
11202 if (isa<ExtVectorType>(VTy)) {
11203 if (TypeSize == Context.getTypeSize(Context.CharTy))
11204 return Context.getExtVectorType(Context.CharTy, VTy->getNumElements());
11205 else if (TypeSize == Context.getTypeSize(Context.ShortTy))
11206 return Context.getExtVectorType(Context.ShortTy, VTy->getNumElements());
11207 else if (TypeSize == Context.getTypeSize(Context.IntTy))
11208 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
11209 else if (TypeSize == Context.getTypeSize(Context.LongTy))
11210 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
11211 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
11212 "Unhandled vector element size in vector compare");
11213 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
11214 }
11215
11216 if (TypeSize == Context.getTypeSize(Context.LongLongTy))
11217 return Context.getVectorType(Context.LongLongTy, VTy->getNumElements(),
11218 VectorType::GenericVector);
11219 else if (TypeSize == Context.getTypeSize(Context.LongTy))
11220 return Context.getVectorType(Context.LongTy, VTy->getNumElements(),
11221 VectorType::GenericVector);
11222 else if (TypeSize == Context.getTypeSize(Context.IntTy))
11223 return Context.getVectorType(Context.IntTy, VTy->getNumElements(),
11224 VectorType::GenericVector);
11225 else if (TypeSize == Context.getTypeSize(Context.ShortTy))
11226 return Context.getVectorType(Context.ShortTy, VTy->getNumElements(),
11227 VectorType::GenericVector);
11228 assert(TypeSize == Context.getTypeSize(Context.CharTy) &&
11229 "Unhandled vector element size in vector compare");
11230 return Context.getVectorType(Context.CharTy, VTy->getNumElements(),
11231 VectorType::GenericVector);
11232 }
11233
11234 /// CheckVectorCompareOperands - vector comparisons are a clang extension that
11235 /// operates on extended vector types. Instead of producing an IntTy result,
11236 /// like a scalar comparison, a vector comparison produces a vector of integer
11237 /// types.
11238 QualType Sema::CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS,
11239 SourceLocation Loc,
11240 BinaryOperatorKind Opc) {
11241 if (Opc == BO_Cmp) {
11242 Diag(Loc, diag::err_three_way_vector_comparison);
11243 return QualType();
11244 }
11245
11246 // Check to make sure we're operating on vectors of the same type and width,
11247 // Allowing one side to be a scalar of element type.
11248 QualType vType = CheckVectorOperands(LHS, RHS, Loc, /*isCompAssign*/false,
11249 /*AllowBothBool*/true,
11250 /*AllowBoolConversions*/getLangOpts().ZVector);
11251 if (vType.isNull())
11252 return vType;
11253
11254 QualType LHSType = LHS.get()->getType();
11255
11256 // If AltiVec, the comparison results in a numeric type, i.e.
11257 // bool for C++, int for C
11258 if (getLangOpts().AltiVec &&
11259 vType->castAs<VectorType>()->getVectorKind() == VectorType::AltiVecVector)
11260 return Context.getLogicalOperationType();
11261
11262 // For non-floating point types, check for self-comparisons of the form
11263 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
11264 // often indicate logic errors in the program.
11265 diagnoseTautologicalComparison(*this, Loc, LHS.get(), RHS.get(), Opc);
11266
11267 // Check for comparisons of floating point operands using != and ==.
11268 if (BinaryOperator::isEqualityOp(Opc) &&
11269 LHSType->hasFloatingRepresentation()) {
11270 assert(RHS.get()->getType()->hasFloatingRepresentation());
11271 CheckFloatComparison(Loc, LHS.get(), RHS.get());
11272 }
11273
11274 // Return a signed type for the vector.
11275 return GetSignedVectorType(vType);
11276 }
11277
11278 static void diagnoseXorMisusedAsPow(Sema &S, const ExprResult &XorLHS,
11279 const ExprResult &XorRHS,
11280 const SourceLocation Loc) {
11281 // Do not diagnose macros.
11282 if (Loc.isMacroID())
11283 return;
11284
11285 bool Negative = false;
11286 bool ExplicitPlus = false;
11287 const auto *LHSInt = dyn_cast<IntegerLiteral>(XorLHS.get());
11288 const auto *RHSInt = dyn_cast<IntegerLiteral>(XorRHS.get());
11289
11290 if (!LHSInt)
11291 return;
11292 if (!RHSInt) {
11293 // Check negative literals.
11294 if (const auto *UO = dyn_cast<UnaryOperator>(XorRHS.get())) {
11295 UnaryOperatorKind Opc = UO->getOpcode();
11296 if (Opc != UO_Minus && Opc != UO_Plus)
11297 return;
11298 RHSInt = dyn_cast<IntegerLiteral>(UO->getSubExpr());
11299 if (!RHSInt)
11300 return;
11301 Negative = (Opc == UO_Minus);
11302 ExplicitPlus = !Negative;
11303 } else {
11304 return;
11305 }
11306 }
11307
11308 const llvm::APInt &LeftSideValue = LHSInt->getValue();
11309 llvm::APInt RightSideValue = RHSInt->getValue();
11310 if (LeftSideValue != 2 && LeftSideValue != 10)
11311 return;
11312
11313 if (LeftSideValue.getBitWidth() != RightSideValue.getBitWidth())
11314 return;
11315
11316 CharSourceRange ExprRange = CharSourceRange::getCharRange(
11317 LHSInt->getBeginLoc(), S.getLocForEndOfToken(RHSInt->getLocation()));
11318 llvm::StringRef ExprStr =
11319 Lexer::getSourceText(ExprRange, S.getSourceManager(), S.getLangOpts());
11320
11321 CharSourceRange XorRange =
11322 CharSourceRange::getCharRange(Loc, S.getLocForEndOfToken(Loc));
11323 llvm::StringRef XorStr =
11324 Lexer::getSourceText(XorRange, S.getSourceManager(), S.getLangOpts());
11325 // Do not diagnose if xor keyword/macro is used.
11326 if (XorStr == "xor")
11327 return;
11328
11329 std::string LHSStr = Lexer::getSourceText(
11330 CharSourceRange::getTokenRange(LHSInt->getSourceRange()),
11331 S.getSourceManager(), S.getLangOpts());
11332 std::string RHSStr = Lexer::getSourceText(
11333 CharSourceRange::getTokenRange(RHSInt->getSourceRange()),
11334 S.getSourceManager(), S.getLangOpts());
11335
11336 if (Negative) {
11337 RightSideValue = -RightSideValue;
11338 RHSStr = "-" + RHSStr;
11339 } else if (ExplicitPlus) {
11340 RHSStr = "+" + RHSStr;
11341 }
11342
11343 StringRef LHSStrRef = LHSStr;
11344 StringRef RHSStrRef = RHSStr;
11345 // Do not diagnose literals with digit separators, binary, hexadecimal, octal
11346 // literals.
11347 if (LHSStrRef.startswith("0b") || LHSStrRef.startswith("0B") ||
11348 RHSStrRef.startswith("0b") || RHSStrRef.startswith("0B") ||
11349 LHSStrRef.startswith("0x") || LHSStrRef.startswith("0X") ||
11350 RHSStrRef.startswith("0x") || RHSStrRef.startswith("0X") ||
11351 (LHSStrRef.size() > 1 && LHSStrRef.startswith("0")) ||
11352 (RHSStrRef.size() > 1 && RHSStrRef.startswith("0")) ||
11353 LHSStrRef.find('\'') != StringRef::npos ||
11354 RHSStrRef.find('\'') != StringRef::npos)
11355 return;
11356
11357 bool SuggestXor = S.getLangOpts().CPlusPlus || S.getPreprocessor().isMacroDefined("xor");
11358 const llvm::APInt XorValue = LeftSideValue ^ RightSideValue;
11359 int64_t RightSideIntValue = RightSideValue.getSExtValue();
11360 if (LeftSideValue == 2 && RightSideIntValue >= 0) {
11361 std::string SuggestedExpr = "1 << " + RHSStr;
11362 bool Overflow = false;
11363 llvm::APInt One = (LeftSideValue - 1);
11364 llvm::APInt PowValue = One.sshl_ov(RightSideValue, Overflow);
11365 if (Overflow) {
11366 if (RightSideIntValue < 64)
11367 S.Diag(Loc, diag::warn_xor_used_as_pow_base)
11368 << ExprStr << XorValue.toString(10, true) << ("1LL << " + RHSStr)
11369 << FixItHint::CreateReplacement(ExprRange, "1LL << " + RHSStr);
11370 else if (RightSideIntValue == 64)
11371 S.Diag(Loc, diag::warn_xor_used_as_pow) << ExprStr << XorValue.toString(10, true);
11372 else
11373 return;
11374 } else {
11375 S.Diag(Loc, diag::warn_xor_used_as_pow_base_extra)
11376 << ExprStr << XorValue.toString(10, true) << SuggestedExpr
11377 << PowValue.toString(10, true)
11378 << FixItHint::CreateReplacement(
11379 ExprRange, (RightSideIntValue == 0) ? "1" : SuggestedExpr);
11380 }
11381
11382 S.Diag(Loc, diag::note_xor_used_as_pow_silence) << ("0x2 ^ " + RHSStr) << SuggestXor;
11383 } else if (LeftSideValue == 10) {
11384 std::string SuggestedValue = "1e" + std::to_string(RightSideIntValue);
11385 S.Diag(Loc, diag::warn_xor_used_as_pow_base)
11386 << ExprStr << XorValue.toString(10, true) << SuggestedValue
11387 << FixItHint::CreateReplacement(ExprRange, SuggestedValue);
11388 S.Diag(Loc, diag::note_xor_used_as_pow_silence) << ("0xA ^ " + RHSStr) << SuggestXor;
11389 }
11390 }
11391
11392 QualType Sema::CheckVectorLogicalOperands(ExprResult &LHS, ExprResult &RHS,
11393 SourceLocation Loc) {
11394 // Ensure that either both operands are of the same vector type, or
11395 // one operand is of a vector type and the other is of its element type.
11396 QualType vType = CheckVectorOperands(LHS, RHS, Loc, false,
11397 /*AllowBothBool*/true,
11398 /*AllowBoolConversions*/false);
11399 if (vType.isNull())
11400 return InvalidOperands(Loc, LHS, RHS);
11401 if (getLangOpts().OpenCL && getLangOpts().OpenCLVersion < 120 &&
11402 !getLangOpts().OpenCLCPlusPlus && vType->hasFloatingRepresentation())
11403 return InvalidOperands(Loc, LHS, RHS);
11404 // FIXME: The check for C++ here is for GCC compatibility. GCC rejects the
11405 // usage of the logical operators && and || with vectors in C. This
11406 // check could be notionally dropped.
11407 if (!getLangOpts().CPlusPlus &&
11408 !(isa<ExtVectorType>(vType->getAs<VectorType>())))
11409 return InvalidLogicalVectorOperands(Loc, LHS, RHS);
11410
11411 return GetSignedVectorType(LHS.get()->getType());
11412 }
11413
11414 inline QualType Sema::CheckBitwiseOperands(ExprResult &LHS, ExprResult &RHS,
11415 SourceLocation Loc,
11416 BinaryOperatorKind Opc) {
11417 checkArithmeticNull(*this, LHS, RHS, Loc, /*IsCompare=*/false);
11418
11419 bool IsCompAssign =
11420 Opc == BO_AndAssign || Opc == BO_OrAssign || Opc == BO_XorAssign;
11421
11422 if (LHS.get()->getType()->isVectorType() ||
11423 RHS.get()->getType()->isVectorType()) {
11424 if (LHS.get()->getType()->hasIntegerRepresentation() &&
11425 RHS.get()->getType()->hasIntegerRepresentation())
11426 return CheckVectorOperands(LHS, RHS, Loc, IsCompAssign,
11427 /*AllowBothBool*/true,
11428 /*AllowBoolConversions*/getLangOpts().ZVector);
11429 return InvalidOperands(Loc, LHS, RHS);
11430 }
11431
11432 if (Opc == BO_And)
11433 diagnoseLogicalNotOnLHSofCheck(*this, LHS, RHS, Loc, Opc);
11434
11435 if (LHS.get()->getType()->hasFloatingRepresentation() ||
11436 RHS.get()->getType()->hasFloatingRepresentation())
11437 return InvalidOperands(Loc, LHS, RHS);
11438
11439 ExprResult LHSResult = LHS, RHSResult = RHS;
11440 QualType compType = UsualArithmeticConversions(
11441 LHSResult, RHSResult, Loc, IsCompAssign ? ACK_CompAssign : ACK_BitwiseOp);
11442 if (LHSResult.isInvalid() || RHSResult.isInvalid())
11443 return QualType();
11444 LHS = LHSResult.get();
11445 RHS = RHSResult.get();
11446
11447 if (Opc == BO_Xor)
11448 diagnoseXorMisusedAsPow(*this, LHS, RHS, Loc);
11449
11450 if (!compType.isNull() && compType->isIntegralOrUnscopedEnumerationType())
11451 return compType;
11452 return InvalidOperands(Loc, LHS, RHS);
11453 }
11454
11455 // C99 6.5.[13,14]
11456 inline QualType Sema::CheckLogicalOperands(ExprResult &LHS, ExprResult &RHS,
11457 SourceLocation Loc,
11458 BinaryOperatorKind Opc) {
11459 // Check vector operands differently.
11460 if (LHS.get()->getType()->isVectorType() || RHS.get()->getType()->isVectorType())
11461 return CheckVectorLogicalOperands(LHS, RHS, Loc);
11462
11463 bool EnumConstantInBoolContext = false;
11464 for (const ExprResult &HS : {LHS, RHS}) {
11465 if (const auto *DREHS = dyn_cast<DeclRefExpr>(HS.get())) {
11466 const auto *ECDHS = dyn_cast<EnumConstantDecl>(DREHS->getDecl());
11467 if (ECDHS && ECDHS->getInitVal() != 0 && ECDHS->getInitVal() != 1)
11468 EnumConstantInBoolContext = true;
11469 }
11470 }
11471
11472 if (EnumConstantInBoolContext)
11473 Diag(Loc, diag::warn_enum_constant_in_bool_context);
11474
11475 // Diagnose cases where the user write a logical and/or but probably meant a
11476 // bitwise one. We do this when the LHS is a non-bool integer and the RHS
11477 // is a constant.
11478 if (!EnumConstantInBoolContext && LHS.get()->getType()->isIntegerType() &&
11479 !LHS.get()->getType()->isBooleanType() &&
11480 RHS.get()->getType()->isIntegerType() && !RHS.get()->isValueDependent() &&
11481 // Don't warn in macros or template instantiations.
11482 !Loc.isMacroID() && !inTemplateInstantiation()) {
11483 // If the RHS can be constant folded, and if it constant folds to something
11484 // that isn't 0 or 1 (which indicate a potential logical operation that
11485 // happened to fold to true/false) then warn.
11486 // Parens on the RHS are ignored.
11487 Expr::EvalResult EVResult;
11488 if (RHS.get()->EvaluateAsInt(EVResult, Context)) {
11489 llvm::APSInt Result = EVResult.Val.getInt();
11490 if ((getLangOpts().Bool && !RHS.get()->getType()->isBooleanType() &&
11491 !RHS.get()->getExprLoc().isMacroID()) ||
11492 (Result != 0 && Result != 1)) {
11493 Diag(Loc, diag::warn_logical_instead_of_bitwise)
11494 << RHS.get()->getSourceRange()
11495 << (Opc == BO_LAnd ? "&&" : "||");
11496 // Suggest replacing the logical operator with the bitwise version
11497 Diag(Loc, diag::note_logical_instead_of_bitwise_change_operator)
11498 << (Opc == BO_LAnd ? "&" : "|")
11499 << FixItHint::CreateReplacement(SourceRange(
11500 Loc, getLocForEndOfToken(Loc)),
11501 Opc == BO_LAnd ? "&" : "|");
11502 if (Opc == BO_LAnd)
11503 // Suggest replacing "Foo() && kNonZero" with "Foo()"
11504 Diag(Loc, diag::note_logical_instead_of_bitwise_remove_constant)
11505 << FixItHint::CreateRemoval(
11506 SourceRange(getLocForEndOfToken(LHS.get()->getEndLoc()),
11507 RHS.get()->getEndLoc()));
11508 }
11509 }
11510 }
11511
11512 if (!Context.getLangOpts().CPlusPlus) {
11513 // OpenCL v1.1 s6.3.g: The logical operators and (&&), or (||) do
11514 // not operate on the built-in scalar and vector float types.
11515 if (Context.getLangOpts().OpenCL &&
11516 Context.getLangOpts().OpenCLVersion < 120) {
11517 if (LHS.get()->getType()->isFloatingType() ||
11518 RHS.get()->getType()->isFloatingType())
11519 return InvalidOperands(Loc, LHS, RHS);
11520 }
11521
11522 LHS = UsualUnaryConversions(LHS.get());
11523 if (LHS.isInvalid())
11524 return QualType();
11525
11526 RHS = UsualUnaryConversions(RHS.get());
11527 if (RHS.isInvalid())
11528 return QualType();
11529
11530 if (!LHS.get()->getType()->isScalarType() ||
11531 !RHS.get()->getType()->isScalarType())
11532 return InvalidOperands(Loc, LHS, RHS);
11533
11534 return Context.IntTy;
11535 }
11536
11537 // The following is safe because we only use this method for
11538 // non-overloadable operands.
11539
11540 // C++ [expr.log.and]p1
11541 // C++ [expr.log.or]p1
11542 // The operands are both contextually converted to type bool.
11543 ExprResult LHSRes = PerformContextuallyConvertToBool(LHS.get());
11544 if (LHSRes.isInvalid())
11545 return InvalidOperands(Loc, LHS, RHS);
11546 LHS = LHSRes;
11547
11548 ExprResult RHSRes = PerformContextuallyConvertToBool(RHS.get());
11549 if (RHSRes.isInvalid())
11550 return InvalidOperands(Loc, LHS, RHS);
11551 RHS = RHSRes;
11552
11553 // C++ [expr.log.and]p2
11554 // C++ [expr.log.or]p2
11555 // The result is a bool.
11556 return Context.BoolTy;
11557 }
11558
11559 static bool IsReadonlyMessage(Expr *E, Sema &S) {
11560 const MemberExpr *ME = dyn_cast<MemberExpr>(E);
11561 if (!ME) return false;
11562 if (!isa<FieldDecl>(ME->getMemberDecl())) return false;
11563 ObjCMessageExpr *Base = dyn_cast<ObjCMessageExpr>(
11564 ME->getBase()->IgnoreImplicit()->IgnoreParenImpCasts());
11565 if (!Base) return false;
11566 return Base->getMethodDecl() != nullptr;
11567 }
11568
11569 /// Is the given expression (which must be 'const') a reference to a
11570 /// variable which was originally non-const, but which has become
11571 /// 'const' due to being captured within a block?
11572 enum NonConstCaptureKind { NCCK_None, NCCK_Block, NCCK_Lambda };
11573 static NonConstCaptureKind isReferenceToNonConstCapture(Sema &S, Expr *E) {
11574 assert(E->isLValue() && E->getType().isConstQualified());
11575 E = E->IgnoreParens();
11576
11577 // Must be a reference to a declaration from an enclosing scope.
11578 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
11579 if (!DRE) return NCCK_None;
11580 if (!DRE->refersToEnclosingVariableOrCapture()) return NCCK_None;
11581
11582 // The declaration must be a variable which is not declared 'const'.
11583 VarDecl *var = dyn_cast<VarDecl>(DRE->getDecl());
11584 if (!var) return NCCK_None;
11585 if (var->getType().isConstQualified()) return NCCK_None;
11586 assert(var->hasLocalStorage() && "capture added 'const' to non-local?");
11587
11588 // Decide whether the first capture was for a block or a lambda.
11589 DeclContext *DC = S.CurContext, *Prev = nullptr;
11590 // Decide whether the first capture was for a block or a lambda.
11591 while (DC) {
11592 // For init-capture, it is possible that the variable belongs to the
11593 // template pattern of the current context.
11594 if (auto *FD = dyn_cast<FunctionDecl>(DC))
11595 if (var->isInitCapture() &&
11596 FD->getTemplateInstantiationPattern() == var->getDeclContext())
11597 break;
11598 if (DC == var->getDeclContext())
11599 break;
11600 Prev = DC;
11601 DC = DC->getParent();
11602 }
11603 // Unless we have an init-capture, we've gone one step too far.
11604 if (!var->isInitCapture())
11605 DC = Prev;
11606 return (isa<BlockDecl>(DC) ? NCCK_Block : NCCK_Lambda);
11607 }
11608
11609 static bool IsTypeModifiable(QualType Ty, bool IsDereference) {
11610 Ty = Ty.getNonReferenceType();
11611 if (IsDereference && Ty->isPointerType())
11612 Ty = Ty->getPointeeType();
11613 return !Ty.isConstQualified();
11614 }
11615
11616 // Update err_typecheck_assign_const and note_typecheck_assign_const
11617 // when this enum is changed.
11618 enum {
11619 ConstFunction,
11620 ConstVariable,
11621 ConstMember,
11622 ConstMethod,
11623 NestedConstMember,
11624 ConstUnknown, // Keep as last element
11625 };
11626
11627 /// Emit the "read-only variable not assignable" error and print notes to give
11628 /// more information about why the variable is not assignable, such as pointing
11629 /// to the declaration of a const variable, showing that a method is const, or
11630 /// that the function is returning a const reference.
11631 static void DiagnoseConstAssignment(Sema &S, const Expr *E,
11632 SourceLocation Loc) {
11633 SourceRange ExprRange = E->getSourceRange();
11634
11635 // Only emit one error on the first const found. All other consts will emit
11636 // a note to the error.
11637 bool DiagnosticEmitted = false;
11638
11639 // Track if the current expression is the result of a dereference, and if the
11640 // next checked expression is the result of a dereference.
11641 bool IsDereference = false;
11642 bool NextIsDereference = false;
11643
11644 // Loop to process MemberExpr chains.
11645 while (true) {
11646 IsDereference = NextIsDereference;
11647
11648 E = E->IgnoreImplicit()->IgnoreParenImpCasts();
11649 if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
11650 NextIsDereference = ME->isArrow();
11651 const ValueDecl *VD = ME->getMemberDecl();
11652 if (const FieldDecl *Field = dyn_cast<FieldDecl>(VD)) {
11653 // Mutable fields can be modified even if the class is const.
11654 if (Field->isMutable()) {
11655 assert(DiagnosticEmitted && "Expected diagnostic not emitted.");
11656 break;
11657 }
11658
11659 if (!IsTypeModifiable(Field->getType(), IsDereference)) {
11660 if (!DiagnosticEmitted) {
11661 S.Diag(Loc, diag::err_typecheck_assign_const)
11662 << ExprRange << ConstMember << false /*static*/ << Field
11663 << Field->getType();
11664 DiagnosticEmitted = true;
11665 }
11666 S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
11667 << ConstMember << false /*static*/ << Field << Field->getType()
11668 << Field->getSourceRange();
11669 }
11670 E = ME->getBase();
11671 continue;
11672 } else if (const VarDecl *VDecl = dyn_cast<VarDecl>(VD)) {
11673 if (VDecl->getType().isConstQualified()) {
11674 if (!DiagnosticEmitted) {
11675 S.Diag(Loc, diag::err_typecheck_assign_const)
11676 << ExprRange << ConstMember << true /*static*/ << VDecl
11677 << VDecl->getType();
11678 DiagnosticEmitted = true;
11679 }
11680 S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
11681 << ConstMember << true /*static*/ << VDecl << VDecl->getType()
11682 << VDecl->getSourceRange();
11683 }
11684 // Static fields do not inherit constness from parents.
11685 break;
11686 }
11687 break; // End MemberExpr
11688 } else if (const ArraySubscriptExpr *ASE =
11689 dyn_cast<ArraySubscriptExpr>(E)) {
11690 E = ASE->getBase()->IgnoreParenImpCasts();
11691 continue;
11692 } else if (const ExtVectorElementExpr *EVE =
11693 dyn_cast<ExtVectorElementExpr>(E)) {
11694 E = EVE->getBase()->IgnoreParenImpCasts();
11695 continue;
11696 }
11697 break;
11698 }
11699
11700 if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
11701 // Function calls
11702 const FunctionDecl *FD = CE->getDirectCallee();
11703 if (FD && !IsTypeModifiable(FD->getReturnType(), IsDereference)) {
11704 if (!DiagnosticEmitted) {
11705 S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange
11706 << ConstFunction << FD;
11707 DiagnosticEmitted = true;
11708 }
11709 S.Diag(FD->getReturnTypeSourceRange().getBegin(),
11710 diag::note_typecheck_assign_const)
11711 << ConstFunction << FD << FD->getReturnType()
11712 << FD->getReturnTypeSourceRange();
11713 }
11714 } else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
11715 // Point to variable declaration.
11716 if (const ValueDecl *VD = DRE->getDecl()) {
11717 if (!IsTypeModifiable(VD->getType(), IsDereference)) {
11718 if (!DiagnosticEmitted) {
11719 S.Diag(Loc, diag::err_typecheck_assign_const)
11720 << ExprRange << ConstVariable << VD << VD->getType();
11721 DiagnosticEmitted = true;
11722 }
11723 S.Diag(VD->getLocation(), diag::note_typecheck_assign_const)
11724 << ConstVariable << VD << VD->getType() << VD->getSourceRange();
11725 }
11726 }
11727 } else if (isa<CXXThisExpr>(E)) {
11728 if (const DeclContext *DC = S.getFunctionLevelDeclContext()) {
11729 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) {
11730 if (MD->isConst()) {
11731 if (!DiagnosticEmitted) {
11732 S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange
11733 << ConstMethod << MD;
11734 DiagnosticEmitted = true;
11735 }
11736 S.Diag(MD->getLocation(), diag::note_typecheck_assign_const)
11737 << ConstMethod << MD << MD->getSourceRange();
11738 }
11739 }
11740 }
11741 }
11742
11743 if (DiagnosticEmitted)
11744 return;
11745
11746 // Can't determine a more specific message, so display the generic error.
11747 S.Diag(Loc, diag::err_typecheck_assign_const) << ExprRange << ConstUnknown;
11748 }
11749
11750 enum OriginalExprKind {
11751 OEK_Variable,
11752 OEK_Member,
11753 OEK_LValue
11754 };
11755
11756 static void DiagnoseRecursiveConstFields(Sema &S, const ValueDecl *VD,
11757 const RecordType *Ty,
11758 SourceLocation Loc, SourceRange Range,
11759 OriginalExprKind OEK,
11760 bool &DiagnosticEmitted) {
11761 std::vector<const RecordType *> RecordTypeList;
11762 RecordTypeList.push_back(Ty);
11763 unsigned NextToCheckIndex = 0;
11764 // We walk the record hierarchy breadth-first to ensure that we print
11765 // diagnostics in field nesting order.
11766 while (RecordTypeList.size() > NextToCheckIndex) {
11767 bool IsNested = NextToCheckIndex > 0;
11768 for (const FieldDecl *Field :
11769 RecordTypeList[NextToCheckIndex]->getDecl()->fields()) {
11770 // First, check every field for constness.
11771 QualType FieldTy = Field->getType();
11772 if (FieldTy.isConstQualified()) {
11773 if (!DiagnosticEmitted) {
11774 S.Diag(Loc, diag::err_typecheck_assign_const)
11775 << Range << NestedConstMember << OEK << VD
11776 << IsNested << Field;
11777 DiagnosticEmitted = true;
11778 }
11779 S.Diag(Field->getLocation(), diag::note_typecheck_assign_const)
11780 << NestedConstMember << IsNested << Field
11781 << FieldTy << Field->getSourceRange();
11782 }
11783
11784 // Then we append it to the list to check next in order.
11785 FieldTy = FieldTy.getCanonicalType();
11786 if (const auto *FieldRecTy = FieldTy->getAs<RecordType>()) {
11787 if (llvm::find(RecordTypeList, FieldRecTy) == RecordTypeList.end())
11788 RecordTypeList.push_back(FieldRecTy);
11789 }
11790 }
11791 ++NextToCheckIndex;
11792 }
11793 }
11794
11795 /// Emit an error for the case where a record we are trying to assign to has a
11796 /// const-qualified field somewhere in its hierarchy.
11797 static void DiagnoseRecursiveConstFields(Sema &S, const Expr *E,
11798 SourceLocation Loc) {
11799 QualType Ty = E->getType();
11800 assert(Ty->isRecordType() && "lvalue was not record?");
11801 SourceRange Range = E->getSourceRange();
11802 const RecordType *RTy = Ty.getCanonicalType()->getAs<RecordType>();
11803 bool DiagEmitted = false;
11804
11805 if (const MemberExpr *ME = dyn_cast<MemberExpr>(E))
11806 DiagnoseRecursiveConstFields(S, ME->getMemberDecl(), RTy, Loc,
11807 Range, OEK_Member, DiagEmitted);
11808 else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
11809 DiagnoseRecursiveConstFields(S, DRE->getDecl(), RTy, Loc,
11810 Range, OEK_Variable, DiagEmitted);
11811 else
11812 DiagnoseRecursiveConstFields(S, nullptr, RTy, Loc,
11813 Range, OEK_LValue, DiagEmitted);
11814 if (!DiagEmitted)
11815 DiagnoseConstAssignment(S, E, Loc);
11816 }
11817
11818 /// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not,
11819 /// emit an error and return true. If so, return false.
11820 static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
11821 assert(!E->hasPlaceholderType(BuiltinType::PseudoObject));
11822
11823 S.CheckShadowingDeclModification(E, Loc);
11824
11825 SourceLocation OrigLoc = Loc;
11826 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
11827 &Loc);
11828 if (IsLV == Expr::MLV_ClassTemporary && IsReadonlyMessage(E, S))
11829 IsLV = Expr::MLV_InvalidMessageExpression;
11830 if (IsLV == Expr::MLV_Valid)
11831 return false;
11832
11833 unsigned DiagID = 0;
11834 bool NeedType = false;
11835 switch (IsLV) { // C99 6.5.16p2
11836 case Expr::MLV_ConstQualified:
11837 // Use a specialized diagnostic when we're assigning to an object
11838 // from an enclosing function or block.
11839 if (NonConstCaptureKind NCCK = isReferenceToNonConstCapture(S, E)) {
11840 if (NCCK == NCCK_Block)
11841 DiagID = diag::err_block_decl_ref_not_modifiable_lvalue;
11842 else
11843 DiagID = diag::err_lambda_decl_ref_not_modifiable_lvalue;
11844 break;
11845 }
11846
11847 // In ARC, use some specialized diagnostics for occasions where we
11848 // infer 'const'. These are always pseudo-strong variables.
11849 if (S.getLangOpts().ObjCAutoRefCount) {
11850 DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
11851 if (declRef && isa<VarDecl>(declRef->getDecl())) {
11852 VarDecl *var = cast<VarDecl>(declRef->getDecl());
11853
11854 // Use the normal diagnostic if it's pseudo-__strong but the
11855 // user actually wrote 'const'.
11856 if (var->isARCPseudoStrong() &&
11857 (!var->getTypeSourceInfo() ||
11858 !var->getTypeSourceInfo()->getType().isConstQualified())) {
11859 // There are three pseudo-strong cases:
11860 // - self
11861 ObjCMethodDecl *method = S.getCurMethodDecl();
11862 if (method && var == method->getSelfDecl()) {
11863 DiagID = method->isClassMethod()
11864 ? diag::err_typecheck_arc_assign_self_class_method
11865 : diag::err_typecheck_arc_assign_self;
11866
11867 // - Objective-C externally_retained attribute.
11868 } else if (var->hasAttr<ObjCExternallyRetainedAttr>() ||
11869 isa<ParmVarDecl>(var)) {
11870 DiagID = diag::err_typecheck_arc_assign_externally_retained;
11871
11872 // - fast enumeration variables
11873 } else {
11874 DiagID = diag::err_typecheck_arr_assign_enumeration;
11875 }
11876
11877 SourceRange Assign;
11878 if (Loc != OrigLoc)
11879 Assign = SourceRange(OrigLoc, OrigLoc);
11880 S.Diag(Loc, DiagID) << E->getSourceRange() << Assign;
11881 // We need to preserve the AST regardless, so migration tool
11882 // can do its job.
11883 return false;
11884 }
11885 }
11886 }
11887
11888 // If none of the special cases above are triggered, then this is a
11889 // simple const assignment.
11890 if (DiagID == 0) {
11891 DiagnoseConstAssignment(S, E, Loc);
11892 return true;
11893 }
11894
11895 break;
11896 case Expr::MLV_ConstAddrSpace:
11897 DiagnoseConstAssignment(S, E, Loc);
11898 return true;
11899 case Expr::MLV_ConstQualifiedField:
11900 DiagnoseRecursiveConstFields(S, E, Loc);
11901 return true;
11902 case Expr::MLV_ArrayType:
11903 case Expr::MLV_ArrayTemporary:
11904 DiagID = diag::err_typecheck_array_not_modifiable_lvalue;
11905 NeedType = true;
11906 break;
11907 case Expr::MLV_NotObjectType:
11908 DiagID = diag::err_typecheck_non_object_not_modifiable_lvalue;
11909 NeedType = true;
11910 break;
11911 case Expr::MLV_LValueCast:
11912 DiagID = diag::err_typecheck_lvalue_casts_not_supported;
11913 break;
11914 case Expr::MLV_Valid:
11915 llvm_unreachable("did not take early return for MLV_Valid");
11916 case Expr::MLV_InvalidExpression:
11917 case Expr::MLV_MemberFunction:
11918 case Expr::MLV_ClassTemporary:
11919 DiagID = diag::err_typecheck_expression_not_modifiable_lvalue;
11920 break;
11921 case Expr::MLV_IncompleteType:
11922 case Expr::MLV_IncompleteVoidType:
11923 return S.RequireCompleteType(Loc, E->getType(),
11924 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, E);
11925 case Expr::MLV_DuplicateVectorComponents:
11926 DiagID = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
11927 break;
11928 case Expr::MLV_NoSetterProperty:
11929 llvm_unreachable("readonly properties should be processed differently");
11930 case Expr::MLV_InvalidMessageExpression:
11931 DiagID = diag::err_readonly_message_assignment;
11932 break;
11933 case Expr::MLV_SubObjCPropertySetting:
11934 DiagID = diag::err_no_subobject_property_setting;
11935 break;
11936 }
11937
11938 SourceRange Assign;
11939 if (Loc != OrigLoc)
11940 Assign = SourceRange(OrigLoc, OrigLoc);
11941 if (NeedType)
11942 S.Diag(Loc, DiagID) << E->getType() << E->getSourceRange() << Assign;
11943 else
11944 S.Diag(Loc, DiagID) << E->getSourceRange() << Assign;
11945 return true;
11946 }
11947
11948 static void CheckIdentityFieldAssignment(Expr *LHSExpr, Expr *RHSExpr,
11949 SourceLocation Loc,
11950 Sema &Sema) {
11951 if (Sema.inTemplateInstantiation())
11952 return;
11953 if (Sema.isUnevaluatedContext())
11954 return;
11955 if (Loc.isInvalid() || Loc.isMacroID())
11956 return;
11957 if (LHSExpr->getExprLoc().isMacroID() || RHSExpr->getExprLoc().isMacroID())
11958 return;
11959
11960 // C / C++ fields
11961 MemberExpr *ML = dyn_cast<MemberExpr>(LHSExpr);
11962 MemberExpr *MR = dyn_cast<MemberExpr>(RHSExpr);
11963 if (ML && MR) {
11964 if (!(isa<CXXThisExpr>(ML->getBase()) && isa<CXXThisExpr>(MR->getBase())))
11965 return;
11966 const ValueDecl *LHSDecl =
11967 cast<ValueDecl>(ML->getMemberDecl()->getCanonicalDecl());
11968 const ValueDecl *RHSDecl =
11969 cast<ValueDecl>(MR->getMemberDecl()->getCanonicalDecl());
11970 if (LHSDecl != RHSDecl)
11971 return;
11972 if (LHSDecl->getType().isVolatileQualified())
11973 return;
11974 if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
11975 if (RefTy->getPointeeType().isVolatileQualified())
11976 return;
11977
11978 Sema.Diag(Loc, diag::warn_identity_field_assign) << 0;
11979 }
11980
11981 // Objective-C instance variables
11982 ObjCIvarRefExpr *OL = dyn_cast<ObjCIvarRefExpr>(LHSExpr);
11983 ObjCIvarRefExpr *OR = dyn_cast<ObjCIvarRefExpr>(RHSExpr);
11984 if (OL && OR && OL->getDecl() == OR->getDecl()) {
11985 DeclRefExpr *RL = dyn_cast<DeclRefExpr>(OL->getBase()->IgnoreImpCasts());
11986 DeclRefExpr *RR = dyn_cast<DeclRefExpr>(OR->getBase()->IgnoreImpCasts());
11987 if (RL && RR && RL->getDecl() == RR->getDecl())
11988 Sema.Diag(Loc, diag::warn_identity_field_assign) << 1;
11989 }
11990 }
11991
11992 // C99 6.5.16.1
11993 QualType Sema::CheckAssignmentOperands(Expr *LHSExpr, ExprResult &RHS,
11994 SourceLocation Loc,
11995 QualType CompoundType) {
11996 assert(!LHSExpr->hasPlaceholderType(BuiltinType::PseudoObject));
11997
11998 // Verify that LHS is a modifiable lvalue, and emit error if not.
11999 if (CheckForModifiableLvalue(LHSExpr, Loc, *this))
12000 return QualType();
12001
12002 QualType LHSType = LHSExpr->getType();
12003 QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() :
12004 CompoundType;
12005 // OpenCL v1.2 s6.1.1.1 p2:
12006 // The half data type can only be used to declare a pointer to a buffer that
12007 // contains half values
12008 if (getLangOpts().OpenCL && !getOpenCLOptions().isEnabled("cl_khr_fp16") &&
12009 LHSType->isHalfType()) {
12010 Diag(Loc, diag::err_opencl_half_load_store) << 1
12011 << LHSType.getUnqualifiedType();
12012 return QualType();
12013 }
12014
12015 AssignConvertType ConvTy;
12016 if (CompoundType.isNull()) {
12017 Expr *RHSCheck = RHS.get();
12018
12019 CheckIdentityFieldAssignment(LHSExpr, RHSCheck, Loc, *this);
12020
12021 QualType LHSTy(LHSType);
12022 ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
12023 if (RHS.isInvalid())
12024 return QualType();
12025 // Special case of NSObject attributes on c-style pointer types.
12026 if (ConvTy == IncompatiblePointer &&
12027 ((Context.isObjCNSObjectType(LHSType) &&
12028 RHSType->isObjCObjectPointerType()) ||
12029 (Context.isObjCNSObjectType(RHSType) &&
12030 LHSType->isObjCObjectPointerType())))
12031 ConvTy = Compatible;
12032
12033 if (ConvTy == Compatible &&
12034 LHSType->isObjCObjectType())
12035 Diag(Loc, diag::err_objc_object_assignment)
12036 << LHSType;
12037
12038 // If the RHS is a unary plus or minus, check to see if they = and + are
12039 // right next to each other. If so, the user may have typo'd "x =+ 4"
12040 // instead of "x += 4".
12041 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
12042 RHSCheck = ICE->getSubExpr();
12043 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
12044 if ((UO->getOpcode() == UO_Plus || UO->getOpcode() == UO_Minus) &&
12045 Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
12046 // Only if the two operators are exactly adjacent.
12047 Loc.getLocWithOffset(1) == UO->getOperatorLoc() &&
12048 // And there is a space or other character before the subexpr of the
12049 // unary +/-. We don't want to warn on "x=-1".
12050 Loc.getLocWithOffset(2) != UO->getSubExpr()->getBeginLoc() &&
12051 UO->getSubExpr()->getBeginLoc().isFileID()) {
12052 Diag(Loc, diag::warn_not_compound_assign)
12053 << (UO->getOpcode() == UO_Plus ? "+" : "-")
12054 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
12055 }
12056 }
12057
12058 if (ConvTy == Compatible) {
12059 if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong) {
12060 // Warn about retain cycles where a block captures the LHS, but
12061 // not if the LHS is a simple variable into which the block is
12062 // being stored...unless that variable can be captured by reference!
12063 const Expr *InnerLHS = LHSExpr->IgnoreParenCasts();
12064 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(InnerLHS);
12065 if (!DRE || DRE->getDecl()->hasAttr<BlocksAttr>())
12066 checkRetainCycles(LHSExpr, RHS.get());
12067 }
12068
12069 if (LHSType.getObjCLifetime() == Qualifiers::OCL_Strong ||
12070 LHSType.isNonWeakInMRRWithObjCWeak(Context)) {
12071 // It is safe to assign a weak reference into a strong variable.
12072 // Although this code can still have problems:
12073 // id x = self.weakProp;
12074 // id y = self.weakProp;
12075 // we do not warn to warn spuriously when 'x' and 'y' are on separate
12076 // paths through the function. This should be revisited if
12077 // -Wrepeated-use-of-weak is made flow-sensitive.
12078 // For ObjCWeak only, we do not warn if the assign is to a non-weak
12079 // variable, which will be valid for the current autorelease scope.
12080 if (!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak,
12081 RHS.get()->getBeginLoc()))
12082 getCurFunction()->markSafeWeakUse(RHS.get());
12083
12084 } else if (getLangOpts().ObjCAutoRefCount || getLangOpts().ObjCWeak) {
12085 checkUnsafeExprAssigns(Loc, LHSExpr, RHS.get());
12086 }
12087 }
12088 } else {
12089 // Compound assignment "x += y"
12090 ConvTy = CheckAssignmentConstraints(Loc, LHSType, RHSType);
12091 }
12092
12093 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
12094 RHS.get(), AA_Assigning))
12095 return QualType();
12096
12097 CheckForNullPointerDereference(*this, LHSExpr);
12098
12099 if (getLangOpts().CPlusPlus2a && LHSType.isVolatileQualified()) {
12100 if (CompoundType.isNull()) {
12101 // C++2a [expr.ass]p5:
12102 // A simple-assignment whose left operand is of a volatile-qualified
12103 // type is deprecated unless the assignment is either a discarded-value
12104 // expression or an unevaluated operand
12105 ExprEvalContexts.back().VolatileAssignmentLHSs.push_back(LHSExpr);
12106 } else {
12107 // C++2a [expr.ass]p6:
12108 // [Compound-assignment] expressions are deprecated if E1 has
12109 // volatile-qualified type
12110 Diag(Loc, diag::warn_deprecated_compound_assign_volatile) << LHSType;
12111 }
12112 }
12113
12114 // C99 6.5.16p3: The type of an assignment expression is the type of the
12115 // left operand unless the left operand has qualified type, in which case
12116 // it is the unqualified version of the type of the left operand.
12117 // C99 6.5.16.1p2: In simple assignment, the value of the right operand
12118 // is converted to the type of the assignment expression (above).
12119 // C++ 5.17p1: the type of the assignment expression is that of its left
12120 // operand.
12121 return (getLangOpts().CPlusPlus
12122 ? LHSType : LHSType.getUnqualifiedType());
12123 }
12124
12125 // Only ignore explicit casts to void.
12126 static bool IgnoreCommaOperand(const Expr *E) {
12127 E = E->IgnoreParens();
12128
12129 if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
12130 if (CE->getCastKind() == CK_ToVoid) {
12131 return true;
12132 }
12133
12134 // static_cast<void> on a dependent type will not show up as CK_ToVoid.
12135 if (CE->getCastKind() == CK_Dependent && E->getType()->isVoidType() &&
12136 CE->getSubExpr()->getType()->isDependentType()) {
12137 return true;
12138 }
12139 }
12140
12141 return false;
12142 }
12143
12144 // Look for instances where it is likely the comma operator is confused with
12145 // another operator. There is a whitelist of acceptable expressions for the
12146 // left hand side of the comma operator, otherwise emit a warning.
12147 void Sema::DiagnoseCommaOperator(const Expr *LHS, SourceLocation Loc) {
12148 // No warnings in macros
12149 if (Loc.isMacroID())
12150 return;
12151
12152 // Don't warn in template instantiations.
12153 if (inTemplateInstantiation())
12154 return;
12155
12156 // Scope isn't fine-grained enough to whitelist the specific cases, so
12157 // instead, skip more than needed, then call back into here with the
12158 // CommaVisitor in SemaStmt.cpp.
12159 // The whitelisted locations are the initialization and increment portions
12160 // of a for loop. The additional checks are on the condition of
12161 // if statements, do/while loops, and for loops.
12162 // Differences in scope flags for C89 mode requires the extra logic.
12163 const unsigned ForIncrementFlags =
12164 getLangOpts().C99 || getLangOpts().CPlusPlus
12165 ? Scope::ControlScope | Scope::ContinueScope | Scope::BreakScope
12166 : Scope::ContinueScope | Scope::BreakScope;
12167 const unsigned ForInitFlags = Scope::ControlScope | Scope::DeclScope;
12168 const unsigned ScopeFlags = getCurScope()->getFlags();
12169 if ((ScopeFlags & ForIncrementFlags) == ForIncrementFlags ||
12170 (ScopeFlags & ForInitFlags) == ForInitFlags)
12171 return;
12172
12173 // If there are multiple comma operators used together, get the RHS of the
12174 // of the comma operator as the LHS.
12175 while (const BinaryOperator *BO = dyn_cast<BinaryOperator>(LHS)) {
12176 if (BO->getOpcode() != BO_Comma)
12177 break;
12178 LHS = BO->getRHS();
12179 }
12180
12181 // Only allow some expressions on LHS to not warn.
12182 if (IgnoreCommaOperand(LHS))
12183 return;
12184
12185 Diag(Loc, diag::warn_comma_operator);
12186 Diag(LHS->getBeginLoc(), diag::note_cast_to_void)
12187 << LHS->getSourceRange()
12188 << FixItHint::CreateInsertion(LHS->getBeginLoc(),
12189 LangOpts.CPlusPlus ? "static_cast<void>("
12190 : "(void)(")
12191 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(LHS->getEndLoc()),
12192 ")");
12193 }
12194
12195 // C99 6.5.17
12196 static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS,
12197 SourceLocation Loc) {
12198 LHS = S.CheckPlaceholderExpr(LHS.get());
12199 RHS = S.CheckPlaceholderExpr(RHS.get());
12200 if (LHS.isInvalid() || RHS.isInvalid())
12201 return QualType();
12202
12203 // C's comma performs lvalue conversion (C99 6.3.2.1) on both its
12204 // operands, but not unary promotions.
12205 // C++'s comma does not do any conversions at all (C++ [expr.comma]p1).
12206
12207 // So we treat the LHS as a ignored value, and in C++ we allow the
12208 // containing site to determine what should be done with the RHS.
12209 LHS = S.IgnoredValueConversions(LHS.get());
12210 if (LHS.isInvalid())
12211 return QualType();
12212
12213 S.DiagnoseUnusedExprResult(LHS.get());
12214
12215 if (!S.getLangOpts().CPlusPlus) {
12216 RHS = S.DefaultFunctionArrayLvalueConversion(RHS.get());
12217 if (RHS.isInvalid())
12218 return QualType();
12219 if (!RHS.get()->getType()->isVoidType())
12220 S.RequireCompleteType(Loc, RHS.get()->getType(),
12221 diag::err_incomplete_type);
12222 }
12223
12224 if (!S.getDiagnostics().isIgnored(diag::warn_comma_operator, Loc))
12225 S.DiagnoseCommaOperator(LHS.get(), Loc);
12226
12227 return RHS.get()->getType();
12228 }
12229
12230 /// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
12231 /// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
12232 static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
12233 ExprValueKind &VK,
12234 ExprObjectKind &OK,
12235 SourceLocation OpLoc,
12236 bool IsInc, bool IsPrefix) {
12237 if (Op->isTypeDependent())
12238 return S.Context.DependentTy;
12239
12240 QualType ResType = Op->getType();
12241 // Atomic types can be used for increment / decrement where the non-atomic
12242 // versions can, so ignore the _Atomic() specifier for the purpose of
12243 // checking.
12244 if (const AtomicType *ResAtomicType = ResType->getAs<AtomicType>())
12245 ResType = ResAtomicType->getValueType();
12246
12247 assert(!ResType.isNull() && "no type for increment/decrement expression");
12248
12249 if (S.getLangOpts().CPlusPlus && ResType->isBooleanType()) {
12250 // Decrement of bool is not allowed.
12251 if (!IsInc) {
12252 S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
12253 return QualType();
12254 }
12255 // Increment of bool sets it to true, but is deprecated.
12256 S.Diag(OpLoc, S.getLangOpts().CPlusPlus17 ? diag::ext_increment_bool
12257 : diag::warn_increment_bool)
12258 << Op->getSourceRange();
12259 } else if (S.getLangOpts().CPlusPlus && ResType->isEnumeralType()) {
12260 // Error on enum increments and decrements in C++ mode
12261 S.Diag(OpLoc, diag::err_increment_decrement_enum) << IsInc << ResType;
12262 return QualType();
12263 } else if (ResType->isRealType()) {
12264 // OK!
12265 } else if (ResType->isPointerType()) {
12266 // C99 6.5.2.4p2, 6.5.6p2
12267 if (!checkArithmeticOpPointerOperand(S, OpLoc, Op))
12268 return QualType();
12269 } else if (ResType->isObjCObjectPointerType()) {
12270 // On modern runtimes, ObjC pointer arithmetic is forbidden.
12271 // Otherwise, we just need a complete type.
12272 if (checkArithmeticIncompletePointerType(S, OpLoc, Op) ||
12273 checkArithmeticOnObjCPointer(S, OpLoc, Op))
12274 return QualType();
12275 } else if (ResType->isAnyComplexType()) {
12276 // C99 does not support ++/-- on complex types, we allow as an extension.
12277 S.Diag(OpLoc, diag::ext_integer_increment_complex)
12278 << ResType << Op->getSourceRange();
12279 } else if (ResType->isPlaceholderType()) {
12280 ExprResult PR = S.CheckPlaceholderExpr(Op);
12281 if (PR.isInvalid()) return QualType();
12282 return CheckIncrementDecrementOperand(S, PR.get(), VK, OK, OpLoc,
12283 IsInc, IsPrefix);
12284 } else if (S.getLangOpts().AltiVec && ResType->isVectorType()) {
12285 // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
12286 } else if (S.getLangOpts().ZVector && ResType->isVectorType() &&
12287 (ResType->castAs<VectorType>()->getVectorKind() !=
12288 VectorType::AltiVecBool)) {
12289 // The z vector extensions allow ++ and -- for non-bool vectors.
12290 } else if(S.getLangOpts().OpenCL && ResType->isVectorType() &&
12291 ResType->castAs<VectorType>()->getElementType()->isIntegerType()) {
12292 // OpenCL V1.2 6.3 says dec/inc ops operate on integer vector types.
12293 } else {
12294 S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
12295 << ResType << int(IsInc) << Op->getSourceRange();
12296 return QualType();
12297 }
12298 // At this point, we know we have a real, complex or pointer type.
12299 // Now make sure the operand is a modifiable lvalue.
12300 if (CheckForModifiableLvalue(Op, OpLoc, S))
12301 return QualType();
12302 if (S.getLangOpts().CPlusPlus2a && ResType.isVolatileQualified()) {
12303 // C++2a [expr.pre.inc]p1, [expr.post.inc]p1:
12304 // An operand with volatile-qualified type is deprecated
12305 S.Diag(OpLoc, diag::warn_deprecated_increment_decrement_volatile)
12306 << IsInc << ResType;
12307 }
12308 // In C++, a prefix increment is the same type as the operand. Otherwise
12309 // (in C or with postfix), the increment is the unqualified type of the
12310 // operand.
12311 if (IsPrefix && S.getLangOpts().CPlusPlus) {
12312 VK = VK_LValue;
12313 OK = Op->getObjectKind();
12314 return ResType;
12315 } else {
12316 VK = VK_RValue;
12317 return ResType.getUnqualifiedType();
12318 }
12319 }
12320
12321
12322 /// getPrimaryDecl - Helper function for CheckAddressOfOperand().
12323 /// This routine allows us to typecheck complex/recursive expressions
12324 /// where the declaration is needed for type checking. We only need to
12325 /// handle cases when the expression references a function designator
12326 /// or is an lvalue. Here are some examples:
12327 /// - &(x) => x
12328 /// - &*****f => f for f a function designator.
12329 /// - &s.xx => s
12330 /// - &s.zz[1].yy -> s, if zz is an array
12331 /// - *(x + 1) -> x, if x is an array
12332 /// - &"123"[2] -> 0
12333 /// - & __real__ x -> x
12334 static ValueDecl *getPrimaryDecl(Expr *E) {
12335 switch (E->getStmtClass()) {
12336 case Stmt::DeclRefExprClass:
12337 return cast<DeclRefExpr>(E)->getDecl();
12338 case Stmt::MemberExprClass:
12339 // If this is an arrow operator, the address is an offset from
12340 // the base's value, so the object the base refers to is
12341 // irrelevant.
12342 if (cast<MemberExpr>(E)->isArrow())
12343 return nullptr;
12344 // Otherwise, the expression refers to a part of the base
12345 return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
12346 case Stmt::ArraySubscriptExprClass: {
12347 // FIXME: This code shouldn't be necessary! We should catch the implicit
12348 // promotion of register arrays earlier.
12349 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
12350 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
12351 if (ICE->getSubExpr()->getType()->isArrayType())
12352 return getPrimaryDecl(ICE->getSubExpr());
12353 }
12354 return nullptr;
12355 }
12356 case Stmt::UnaryOperatorClass: {
12357 UnaryOperator *UO = cast<UnaryOperator>(E);
12358
12359 switch(UO->getOpcode()) {
12360 case UO_Real:
12361 case UO_Imag:
12362 case UO_Extension:
12363 return getPrimaryDecl(UO->getSubExpr());
12364 default:
12365 return nullptr;
12366 }
12367 }
12368 case Stmt::ParenExprClass:
12369 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
12370 case Stmt::ImplicitCastExprClass:
12371 // If the result of an implicit cast is an l-value, we care about
12372 // the sub-expression; otherwise, the result here doesn't matter.
12373 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
12374 default:
12375 return nullptr;
12376 }
12377 }
12378
12379 namespace {
12380 enum {
12381 AO_Bit_Field = 0,
12382 AO_Vector_Element = 1,
12383 AO_Property_Expansion = 2,
12384 AO_Register_Variable = 3,
12385 AO_No_Error = 4
12386 };
12387 }
12388 /// Diagnose invalid operand for address of operations.
12389 ///
12390 /// \param Type The type of operand which cannot have its address taken.
12391 static void diagnoseAddressOfInvalidType(Sema &S, SourceLocation Loc,
12392 Expr *E, unsigned Type) {
12393 S.Diag(Loc, diag::err_typecheck_address_of) << Type << E->getSourceRange();
12394 }
12395
12396 /// CheckAddressOfOperand - The operand of & must be either a function
12397 /// designator or an lvalue designating an object. If it is an lvalue, the
12398 /// object cannot be declared with storage class register or be a bit field.
12399 /// Note: The usual conversions are *not* applied to the operand of the &
12400 /// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
12401 /// In C++, the operand might be an overloaded function name, in which case
12402 /// we allow the '&' but retain the overloaded-function type.
12403 QualType Sema::CheckAddressOfOperand(ExprResult &OrigOp, SourceLocation OpLoc) {
12404 if (const BuiltinType *PTy = OrigOp.get()->getType()->getAsPlaceholderType()){
12405 if (PTy->getKind() == BuiltinType::Overload) {
12406 Expr *E = OrigOp.get()->IgnoreParens();
12407 if (!isa<OverloadExpr>(E)) {
12408 assert(cast<UnaryOperator>(E)->getOpcode() == UO_AddrOf);
12409 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof_addrof_function)
12410 << OrigOp.get()->getSourceRange();
12411 return QualType();
12412 }
12413
12414 OverloadExpr *Ovl = cast<OverloadExpr>(E);
12415 if (isa<UnresolvedMemberExpr>(Ovl))
12416 if (!ResolveSingleFunctionTemplateSpecialization(Ovl)) {
12417 Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
12418 << OrigOp.get()->getSourceRange();
12419 return QualType();
12420 }
12421
12422 return Context.OverloadTy;
12423 }
12424
12425 if (PTy->getKind() == BuiltinType::UnknownAny)
12426 return Context.UnknownAnyTy;
12427
12428 if (PTy->getKind() == BuiltinType::BoundMember) {
12429 Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
12430 << OrigOp.get()->getSourceRange();
12431 return QualType();
12432 }
12433
12434 OrigOp = CheckPlaceholderExpr(OrigOp.get());
12435 if (OrigOp.isInvalid()) return QualType();
12436 }
12437
12438 if (OrigOp.get()->isTypeDependent())
12439 return Context.DependentTy;
12440
12441 assert(!OrigOp.get()->getType()->isPlaceholderType());
12442
12443 // Make sure to ignore parentheses in subsequent checks
12444 Expr *op = OrigOp.get()->IgnoreParens();
12445
12446 // In OpenCL captures for blocks called as lambda functions
12447 // are located in the private address space. Blocks used in
12448 // enqueue_kernel can be located in a different address space
12449 // depending on a vendor implementation. Thus preventing
12450 // taking an address of the capture to avoid invalid AS casts.
12451 if (LangOpts.OpenCL) {
12452 auto* VarRef = dyn_cast<DeclRefExpr>(op);
12453 if (VarRef && VarRef->refersToEnclosingVariableOrCapture()) {
12454 Diag(op->getExprLoc(), diag::err_opencl_taking_address_capture);
12455 return QualType();
12456 }
12457 }
12458
12459 if (getLangOpts().C99) {
12460 // Implement C99-only parts of addressof rules.
12461 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
12462 if (uOp->getOpcode() == UO_Deref)
12463 // Per C99 6.5.3.2, the address of a deref always returns a valid result
12464 // (assuming the deref expression is valid).
12465 return uOp->getSubExpr()->getType();
12466 }
12467 // Technically, there should be a check for array subscript
12468 // expressions here, but the result of one is always an lvalue anyway.
12469 }
12470 ValueDecl *dcl = getPrimaryDecl(op);
12471
12472 if (auto *FD = dyn_cast_or_null<FunctionDecl>(dcl))
12473 if (!checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
12474 op->getBeginLoc()))
12475 return QualType();
12476
12477 Expr::LValueClassification lval = op->ClassifyLValue(Context);
12478 unsigned AddressOfError = AO_No_Error;
12479
12480 if (lval == Expr::LV_ClassTemporary || lval == Expr::LV_ArrayTemporary) {
12481 bool sfinae = (bool)isSFINAEContext();
12482 Diag(OpLoc, isSFINAEContext() ? diag::err_typecheck_addrof_temporary
12483 : diag::ext_typecheck_addrof_temporary)
12484 << op->getType() << op->getSourceRange();
12485 if (sfinae)
12486 return QualType();
12487 // Materialize the temporary as an lvalue so that we can take its address.
12488 OrigOp = op =
12489 CreateMaterializeTemporaryExpr(op->getType(), OrigOp.get(), true);
12490 } else if (isa<ObjCSelectorExpr>(op)) {
12491 return Context.getPointerType(op->getType());
12492 } else if (lval == Expr::LV_MemberFunction) {
12493 // If it's an instance method, make a member pointer.
12494 // The expression must have exactly the form &A::foo.
12495
12496 // If the underlying expression isn't a decl ref, give up.
12497 if (!isa<DeclRefExpr>(op)) {
12498 Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
12499 << OrigOp.get()->getSourceRange();
12500 return QualType();
12501 }
12502 DeclRefExpr *DRE = cast<DeclRefExpr>(op);
12503 CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
12504
12505 // The id-expression was parenthesized.
12506 if (OrigOp.get() != DRE) {
12507 Diag(OpLoc, diag::err_parens_pointer_member_function)
12508 << OrigOp.get()->getSourceRange();
12509
12510 // The method was named without a qualifier.
12511 } else if (!DRE->getQualifier()) {
12512 if (MD->getParent()->getName().empty())
12513 Diag(OpLoc, diag::err_unqualified_pointer_member_function)
12514 << op->getSourceRange();
12515 else {
12516 SmallString<32> Str;
12517 StringRef Qual = (MD->getParent()->getName() + "::").toStringRef(Str);
12518 Diag(OpLoc, diag::err_unqualified_pointer_member_function)
12519 << op->getSourceRange()
12520 << FixItHint::CreateInsertion(op->getSourceRange().getBegin(), Qual);
12521 }
12522 }
12523
12524 // Taking the address of a dtor is illegal per C++ [class.dtor]p2.
12525 if (isa<CXXDestructorDecl>(MD))
12526 Diag(OpLoc, diag::err_typecheck_addrof_dtor) << op->getSourceRange();
12527
12528 QualType MPTy = Context.getMemberPointerType(
12529 op->getType(), Context.getTypeDeclType(MD->getParent()).getTypePtr());
12530 // Under the MS ABI, lock down the inheritance model now.
12531 if (Context.getTargetInfo().getCXXABI().isMicrosoft())
12532 (void)isCompleteType(OpLoc, MPTy);
12533 return MPTy;
12534 } else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
12535 // C99 6.5.3.2p1
12536 // The operand must be either an l-value or a function designator
12537 if (!op->getType()->isFunctionType()) {
12538 // Use a special diagnostic for loads from property references.
12539 if (isa<PseudoObjectExpr>(op)) {
12540 AddressOfError = AO_Property_Expansion;
12541 } else {
12542 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
12543 << op->getType() << op->getSourceRange();
12544 return QualType();
12545 }
12546 }
12547 } else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
12548 // The operand cannot be a bit-field
12549 AddressOfError = AO_Bit_Field;
12550 } else if (op->getObjectKind() == OK_VectorComponent) {
12551 // The operand cannot be an element of a vector
12552 AddressOfError = AO_Vector_Element;
12553 } else if (dcl) { // C99 6.5.3.2p1
12554 // We have an lvalue with a decl. Make sure the decl is not declared
12555 // with the register storage-class specifier.
12556 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
12557 // in C++ it is not error to take address of a register
12558 // variable (c++03 7.1.1P3)
12559 if (vd->getStorageClass() == SC_Register &&
12560 !getLangOpts().CPlusPlus) {
12561 AddressOfError = AO_Register_Variable;
12562 }
12563 } else if (isa<MSPropertyDecl>(dcl)) {
12564 AddressOfError = AO_Property_Expansion;
12565 } else if (isa<FunctionTemplateDecl>(dcl)) {
12566 return Context.OverloadTy;
12567 } else if (isa<FieldDecl>(dcl) || isa<IndirectFieldDecl>(dcl)) {
12568 // Okay: we can take the address of a field.
12569 // Could be a pointer to member, though, if there is an explicit
12570 // scope qualifier for the class.
12571 if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
12572 DeclContext *Ctx = dcl->getDeclContext();
12573 if (Ctx && Ctx->isRecord()) {
12574 if (dcl->getType()->isReferenceType()) {
12575 Diag(OpLoc,
12576 diag::err_cannot_form_pointer_to_member_of_reference_type)
12577 << dcl->getDeclName() << dcl->getType();
12578 return QualType();
12579 }
12580
12581 while (cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion())
12582 Ctx = Ctx->getParent();
12583
12584 QualType MPTy = Context.getMemberPointerType(
12585 op->getType(),
12586 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
12587 // Under the MS ABI, lock down the inheritance model now.
12588 if (Context.getTargetInfo().getCXXABI().isMicrosoft())
12589 (void)isCompleteType(OpLoc, MPTy);
12590 return MPTy;
12591 }
12592 }
12593 } else if (!isa<FunctionDecl>(dcl) && !isa<NonTypeTemplateParmDecl>(dcl) &&
12594 !isa<BindingDecl>(dcl))
12595 llvm_unreachable("Unknown/unexpected decl type");
12596 }
12597
12598 if (AddressOfError != AO_No_Error) {
12599 diagnoseAddressOfInvalidType(*this, OpLoc, op, AddressOfError);
12600 return QualType();
12601 }
12602
12603 if (lval == Expr::LV_IncompleteVoidType) {
12604 // Taking the address of a void variable is technically illegal, but we
12605 // allow it in cases which are otherwise valid.
12606 // Example: "extern void x; void* y = &x;".
12607 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
12608 }
12609
12610 // If the operand has type "type", the result has type "pointer to type".
12611 if (op->getType()->isObjCObjectType())
12612 return Context.getObjCObjectPointerType(op->getType());
12613
12614 CheckAddressOfPackedMember(op);
12615
12616 return Context.getPointerType(op->getType());
12617 }
12618
12619 static void RecordModifiableNonNullParam(Sema &S, const Expr *Exp) {
12620 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Exp);
12621 if (!DRE)
12622 return;
12623 const Decl *D = DRE->getDecl();
12624 if (!D)
12625 return;
12626 const ParmVarDecl *Param = dyn_cast<ParmVarDecl>(D);
12627 if (!Param)
12628 return;
12629 if (const FunctionDecl* FD = dyn_cast<FunctionDecl>(Param->getDeclContext()))
12630 if (!FD->hasAttr<NonNullAttr>() && !Param->hasAttr<NonNullAttr>())
12631 return;
12632 if (FunctionScopeInfo *FD = S.getCurFunction())
12633 if (!FD->ModifiedNonNullParams.count(Param))
12634 FD->ModifiedNonNullParams.insert(Param);
12635 }
12636
12637 /// CheckIndirectionOperand - Type check unary indirection (prefix '*').
12638 static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
12639 SourceLocation OpLoc) {
12640 if (Op->isTypeDependent())
12641 return S.Context.DependentTy;
12642
12643 ExprResult ConvResult = S.UsualUnaryConversions(Op);
12644 if (ConvResult.isInvalid())
12645 return QualType();
12646 Op = ConvResult.get();
12647 QualType OpTy = Op->getType();
12648 QualType Result;
12649
12650 if (isa<CXXReinterpretCastExpr>(Op)) {
12651 QualType OpOrigType = Op->IgnoreParenCasts()->getType();
12652 S.CheckCompatibleReinterpretCast(OpOrigType, OpTy, /*IsDereference*/true,
12653 Op->getSourceRange());
12654 }
12655
12656 if (const PointerType *PT = OpTy->getAs<PointerType>())
12657 {
12658 Result = PT->getPointeeType();
12659 }
12660 else if (const ObjCObjectPointerType *OPT =
12661 OpTy->getAs<ObjCObjectPointerType>())
12662 Result = OPT->getPointeeType();
12663 else {
12664 ExprResult PR = S.CheckPlaceholderExpr(Op);
12665 if (PR.isInvalid()) return QualType();
12666 if (PR.get() != Op)
12667 return CheckIndirectionOperand(S, PR.get(), VK, OpLoc);
12668 }
12669
12670 if (Result.isNull()) {
12671 S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
12672 << OpTy << Op->getSourceRange();
12673 return QualType();
12674 }
12675
12676 // Note that per both C89 and C99, indirection is always legal, even if Result
12677 // is an incomplete type or void. It would be possible to warn about
12678 // dereferencing a void pointer, but it's completely well-defined, and such a
12679 // warning is unlikely to catch any mistakes. In C++, indirection is not valid
12680 // for pointers to 'void' but is fine for any other pointer type:
12681 //
12682 // C++ [expr.unary.op]p1:
12683 // [...] the expression to which [the unary * operator] is applied shall
12684 // be a pointer to an object type, or a pointer to a function type
12685 if (S.getLangOpts().CPlusPlus && Result->isVoidType())
12686 S.Diag(OpLoc, diag::ext_typecheck_indirection_through_void_pointer)
12687 << OpTy << Op->getSourceRange();
12688
12689 // Dereferences are usually l-values...
12690 VK = VK_LValue;
12691
12692 // ...except that certain expressions are never l-values in C.
12693 if (!S.getLangOpts().CPlusPlus && Result.isCForbiddenLValueType())
12694 VK = VK_RValue;
12695
12696 return Result;
12697 }
12698
12699 BinaryOperatorKind Sema::ConvertTokenKindToBinaryOpcode(tok::TokenKind Kind) {
12700 BinaryOperatorKind Opc;
12701 switch (Kind) {
12702 default: llvm_unreachable("Unknown binop!");
12703 case tok::periodstar: Opc = BO_PtrMemD; break;
12704 case tok::arrowstar: Opc = BO_PtrMemI; break;
12705 case tok::star: Opc = BO_Mul; break;
12706 case tok::slash: Opc = BO_Div; break;
12707 case tok::percent: Opc = BO_Rem; break;
12708 case tok::plus: Opc = BO_Add; break;
12709 case tok::minus: Opc = BO_Sub; break;
12710 case tok::lessless: Opc = BO_Shl; break;
12711 case tok::greatergreater: Opc = BO_Shr; break;
12712 case tok::lessequal: Opc = BO_LE; break;
12713 case tok::less: Opc = BO_LT; break;
12714 case tok::greaterequal: Opc = BO_GE; break;
12715 case tok::greater: Opc = BO_GT; break;
12716 case tok::exclaimequal: Opc = BO_NE; break;
12717 case tok::equalequal: Opc = BO_EQ; break;
12718 case tok::spaceship: Opc = BO_Cmp; break;
12719 case tok::amp: Opc = BO_And; break;
12720 case tok::caret: Opc = BO_Xor; break;
12721 case tok::pipe: Opc = BO_Or; break;
12722 case tok::ampamp: Opc = BO_LAnd; break;
12723 case tok::pipepipe: Opc = BO_LOr; break;
12724 case tok::equal: Opc = BO_Assign; break;
12725 case tok::starequal: Opc = BO_MulAssign; break;
12726 case tok::slashequal: Opc = BO_DivAssign; break;
12727 case tok::percentequal: Opc = BO_RemAssign; break;
12728 case tok::plusequal: Opc = BO_AddAssign; break;
12729 case tok::minusequal: Opc = BO_SubAssign; break;
12730 case tok::lesslessequal: Opc = BO_ShlAssign; break;
12731 case tok::greatergreaterequal: Opc = BO_ShrAssign; break;
12732 case tok::ampequal: Opc = BO_AndAssign; break;
12733 case tok::caretequal: Opc = BO_XorAssign; break;
12734 case tok::pipeequal: Opc = BO_OrAssign; break;
12735 case tok::comma: Opc = BO_Comma; break;
12736 }
12737 return Opc;
12738 }
12739
12740 static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
12741 tok::TokenKind Kind) {
12742 UnaryOperatorKind Opc;
12743 switch (Kind) {
12744 default: llvm_unreachable("Unknown unary op!");
12745 case tok::plusplus: Opc = UO_PreInc; break;
12746 case tok::minusminus: Opc = UO_PreDec; break;
12747 case tok::amp: Opc = UO_AddrOf; break;
12748 case tok::star: Opc = UO_Deref; break;
12749 case tok::plus: Opc = UO_Plus; break;
12750 case tok::minus: Opc = UO_Minus; break;
12751 case tok::tilde: Opc = UO_Not; break;
12752 case tok::exclaim: Opc = UO_LNot; break;
12753 case tok::kw___real: Opc = UO_Real; break;
12754 case tok::kw___imag: Opc = UO_Imag; break;
12755 case tok::kw___extension__: Opc = UO_Extension; break;
12756 }
12757 return Opc;
12758 }
12759
12760 /// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
12761 /// This warning suppressed in the event of macro expansions.
12762 static void DiagnoseSelfAssignment(Sema &S, Expr *LHSExpr, Expr *RHSExpr,
12763 SourceLocation OpLoc, bool IsBuiltin) {
12764 if (S.inTemplateInstantiation())
12765 return;
12766 if (S.isUnevaluatedContext())
12767 return;
12768 if (OpLoc.isInvalid() || OpLoc.isMacroID())
12769 return;
12770 LHSExpr = LHSExpr->IgnoreParenImpCasts();
12771 RHSExpr = RHSExpr->IgnoreParenImpCasts();
12772 const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
12773 const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
12774 if (!LHSDeclRef || !RHSDeclRef ||
12775 LHSDeclRef->getLocation().isMacroID() ||
12776 RHSDeclRef->getLocation().isMacroID())
12777 return;
12778 const ValueDecl *LHSDecl =
12779 cast<ValueDecl>(LHSDeclRef->getDecl()->getCanonicalDecl());
12780 const ValueDecl *RHSDecl =
12781 cast<ValueDecl>(RHSDeclRef->getDecl()->getCanonicalDecl());
12782 if (LHSDecl != RHSDecl)
12783 return;
12784 if (LHSDecl->getType().isVolatileQualified())
12785 return;
12786 if (const ReferenceType *RefTy = LHSDecl->getType()->getAs<ReferenceType>())
12787 if (RefTy->getPointeeType().isVolatileQualified())
12788 return;
12789
12790 S.Diag(OpLoc, IsBuiltin ? diag::warn_self_assignment_builtin
12791 : diag::warn_self_assignment_overloaded)
12792 << LHSDeclRef->getType() << LHSExpr->getSourceRange()
12793 << RHSExpr->getSourceRange();
12794 }
12795
12796 /// Check if a bitwise-& is performed on an Objective-C pointer. This
12797 /// is usually indicative of introspection within the Objective-C pointer.
12798 static void checkObjCPointerIntrospection(Sema &S, ExprResult &L, ExprResult &R,
12799 SourceLocation OpLoc) {
12800 if (!S.getLangOpts().ObjC)
12801 return;
12802
12803 const Expr *ObjCPointerExpr = nullptr, *OtherExpr = nullptr;
12804 const Expr *LHS = L.get();
12805 const Expr *RHS = R.get();
12806
12807 if (LHS->IgnoreParenCasts()->getType()->isObjCObjectPointerType()) {
12808 ObjCPointerExpr = LHS;
12809 OtherExpr = RHS;
12810 }
12811 else if (RHS->IgnoreParenCasts()->getType()->isObjCObjectPointerType()) {
12812 ObjCPointerExpr = RHS;
12813 OtherExpr = LHS;
12814 }
12815
12816 // This warning is deliberately made very specific to reduce false
12817 // positives with logic that uses '&' for hashing. This logic mainly
12818 // looks for code trying to introspect into tagged pointers, which
12819 // code should generally never do.
12820 if (ObjCPointerExpr && isa<IntegerLiteral>(OtherExpr->IgnoreParenCasts())) {
12821 unsigned Diag = diag::warn_objc_pointer_masking;
12822 // Determine if we are introspecting the result of performSelectorXXX.
12823 const Expr *Ex = ObjCPointerExpr->IgnoreParenCasts();
12824 // Special case messages to -performSelector and friends, which
12825 // can return non-pointer values boxed in a pointer value.
12826 // Some clients may wish to silence warnings in this subcase.
12827 if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(Ex)) {
12828 Selector S = ME->getSelector();
12829 StringRef SelArg0 = S.getNameForSlot(0);
12830 if (SelArg0.startswith("performSelector"))
12831 Diag = diag::warn_objc_pointer_masking_performSelector;
12832 }
12833
12834 S.Diag(OpLoc, Diag)
12835 << ObjCPointerExpr->getSourceRange();
12836 }
12837 }
12838
12839 static NamedDecl *getDeclFromExpr(Expr *E) {
12840 if (!E)
12841 return nullptr;
12842 if (auto *DRE = dyn_cast<DeclRefExpr>(E))
12843 return DRE->getDecl();
12844 if (auto *ME = dyn_cast<MemberExpr>(E))
12845 return ME->getMemberDecl();
12846 if (auto *IRE = dyn_cast<ObjCIvarRefExpr>(E))
12847 return IRE->getDecl();
12848 return nullptr;
12849 }
12850
12851 // This helper function promotes a binary operator's operands (which are of a
12852 // half vector type) to a vector of floats and then truncates the result to
12853 // a vector of either half or short.
12854 static ExprResult convertHalfVecBinOp(Sema &S, ExprResult LHS, ExprResult RHS,
12855 BinaryOperatorKind Opc, QualType ResultTy,
12856 ExprValueKind VK, ExprObjectKind OK,
12857 bool IsCompAssign, SourceLocation OpLoc,
12858 FPOptions FPFeatures) {
12859 auto &Context = S.getASTContext();
12860 assert((isVector(ResultTy, Context.HalfTy) ||
12861 isVector(ResultTy, Context.ShortTy)) &&
12862 "Result must be a vector of half or short");
12863 assert(isVector(LHS.get()->getType(), Context.HalfTy) &&
12864 isVector(RHS.get()->getType(), Context.HalfTy) &&
12865 "both operands expected to be a half vector");
12866
12867 RHS = convertVector(RHS.get(), Context.FloatTy, S);
12868 QualType BinOpResTy = RHS.get()->getType();
12869
12870 // If Opc is a comparison, ResultType is a vector of shorts. In that case,
12871 // change BinOpResTy to a vector of ints.
12872 if (isVector(ResultTy, Context.ShortTy))
12873 BinOpResTy = S.GetSignedVectorType(BinOpResTy);
12874
12875 if (IsCompAssign)
12876 return new (Context) CompoundAssignOperator(
12877 LHS.get(), RHS.get(), Opc, ResultTy, VK, OK, BinOpResTy, BinOpResTy,
12878 OpLoc, FPFeatures);
12879
12880 LHS = convertVector(LHS.get(), Context.FloatTy, S);
12881 auto *BO = new (Context) BinaryOperator(LHS.get(), RHS.get(), Opc, BinOpResTy,
12882 VK, OK, OpLoc, FPFeatures);
12883 return convertVector(BO, ResultTy->castAs<VectorType>()->getElementType(), S);
12884 }
12885
12886 static std::pair<ExprResult, ExprResult>
12887 CorrectDelayedTyposInBinOp(Sema &S, BinaryOperatorKind Opc, Expr *LHSExpr,
12888 Expr *RHSExpr) {
12889 ExprResult LHS = LHSExpr, RHS = RHSExpr;
12890 if (!S.getLangOpts().CPlusPlus) {
12891 // C cannot handle TypoExpr nodes on either side of a binop because it
12892 // doesn't handle dependent types properly, so make sure any TypoExprs have
12893 // been dealt with before checking the operands.
12894 LHS = S.CorrectDelayedTyposInExpr(LHS);
12895 RHS = S.CorrectDelayedTyposInExpr(RHS, [Opc, LHS](Expr *E) {
12896 if (Opc != BO_Assign)
12897 return ExprResult(E);
12898 // Avoid correcting the RHS to the same Expr as the LHS.
12899 Decl *D = getDeclFromExpr(E);
12900 return (D && D == getDeclFromExpr(LHS.get())) ? ExprError() : E;
12901 });
12902 }
12903 return std::make_pair(LHS, RHS);
12904 }
12905
12906 /// Returns true if conversion between vectors of halfs and vectors of floats
12907 /// is needed.
12908 static bool needsConversionOfHalfVec(bool OpRequiresConversion, ASTContext &Ctx,
12909 QualType SrcType) {
12910 return OpRequiresConversion && !Ctx.getLangOpts().NativeHalfType &&
12911 !Ctx.getTargetInfo().useFP16ConversionIntrinsics() &&
12912 isVector(SrcType, Ctx.HalfTy);
12913 }
12914
12915 /// CreateBuiltinBinOp - Creates a new built-in binary operation with
12916 /// operator @p Opc at location @c TokLoc. This routine only supports
12917 /// built-in operations; ActOnBinOp handles overloaded operators.
12918 ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
12919 BinaryOperatorKind Opc,
12920 Expr *LHSExpr, Expr *RHSExpr) {
12921 if (getLangOpts().CPlusPlus11 && isa<InitListExpr>(RHSExpr)) {
12922 // The syntax only allows initializer lists on the RHS of assignment,
12923 // so we don't need to worry about accepting invalid code for
12924 // non-assignment operators.
12925 // C++11 5.17p9:
12926 // The meaning of x = {v} [...] is that of x = T(v) [...]. The meaning
12927 // of x = {} is x = T().
12928 InitializationKind Kind = InitializationKind::CreateDirectList(
12929 RHSExpr->getBeginLoc(), RHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
12930 InitializedEntity Entity =
12931 InitializedEntity::InitializeTemporary(LHSExpr->getType());
12932 InitializationSequence InitSeq(*this, Entity, Kind, RHSExpr);
12933 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, RHSExpr);
12934 if (Init.isInvalid())
12935 return Init;
12936 RHSExpr = Init.get();
12937 }
12938
12939 ExprResult LHS = LHSExpr, RHS = RHSExpr;
12940 QualType ResultTy; // Result type of the binary operator.
12941 // The following two variables are used for compound assignment operators
12942 QualType CompLHSTy; // Type of LHS after promotions for computation
12943 QualType CompResultTy; // Type of computation result
12944 ExprValueKind VK = VK_RValue;
12945 ExprObjectKind OK = OK_Ordinary;
12946 bool ConvertHalfVec = false;
12947
12948 std::tie(LHS, RHS) = CorrectDelayedTyposInBinOp(*this, Opc, LHSExpr, RHSExpr);
12949 if (!LHS.isUsable() || !RHS.isUsable())
12950 return ExprError();
12951
12952 if (getLangOpts().OpenCL) {
12953 QualType LHSTy = LHSExpr->getType();
12954 QualType RHSTy = RHSExpr->getType();
12955 // OpenCLC v2.0 s6.13.11.1 allows atomic variables to be initialized by
12956 // the ATOMIC_VAR_INIT macro.
12957 if (LHSTy->isAtomicType() || RHSTy->isAtomicType()) {
12958 SourceRange SR(LHSExpr->getBeginLoc(), RHSExpr->getEndLoc());
12959 if (BO_Assign == Opc)
12960 Diag(OpLoc, diag::err_opencl_atomic_init) << 0 << SR;
12961 else
12962 ResultTy = InvalidOperands(OpLoc, LHS, RHS);
12963 return ExprError();
12964 }
12965
12966 // OpenCL special types - image, sampler, pipe, and blocks are to be used
12967 // only with a builtin functions and therefore should be disallowed here.
12968 if (LHSTy->isImageType() || RHSTy->isImageType() ||
12969 LHSTy->isSamplerT() || RHSTy->isSamplerT() ||
12970 LHSTy->isPipeType() || RHSTy->isPipeType() ||
12971 LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) {
12972 ResultTy = InvalidOperands(OpLoc, LHS, RHS);
12973 return ExprError();
12974 }
12975 }
12976
12977 // Diagnose operations on the unsupported types for OpenMP device compilation.
12978 if (getLangOpts().OpenMP && getLangOpts().OpenMPIsDevice) {
12979 if (Opc != BO_Assign && Opc != BO_Comma) {
12980 checkOpenMPDeviceExpr(LHSExpr);
12981 checkOpenMPDeviceExpr(RHSExpr);
12982 }
12983 }
12984
12985 switch (Opc) {
12986 case BO_Assign:
12987 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, QualType());
12988 if (getLangOpts().CPlusPlus &&
12989 LHS.get()->getObjectKind() != OK_ObjCProperty) {
12990 VK = LHS.get()->getValueKind();
12991 OK = LHS.get()->getObjectKind();
12992 }
12993 if (!ResultTy.isNull()) {
12994 DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc, true);
12995 DiagnoseSelfMove(LHS.get(), RHS.get(), OpLoc);
12996
12997 // Avoid copying a block to the heap if the block is assigned to a local
12998 // auto variable that is declared in the same scope as the block. This
12999 // optimization is unsafe if the local variable is declared in an outer
13000 // scope. For example:
13001 //
13002 // BlockTy b;
13003 // {
13004 // b = ^{...};
13005 // }
13006 // // It is unsafe to invoke the block here if it wasn't copied to the
13007 // // heap.
13008 // b();
13009
13010 if (auto *BE = dyn_cast<BlockExpr>(RHS.get()->IgnoreParens()))
13011 if (auto *DRE = dyn_cast<DeclRefExpr>(LHS.get()->IgnoreParens()))
13012 if (auto *VD = dyn_cast<VarDecl>(DRE->getDecl()))
13013 if (VD->hasLocalStorage() && getCurScope()->isDeclScope(VD))
13014 BE->getBlockDecl()->setCanAvoidCopyToHeap();
13015
13016 if (LHS.get()->getType().hasNonTrivialToPrimitiveCopyCUnion())
13017 checkNonTrivialCUnion(LHS.get()->getType(), LHS.get()->getExprLoc(),
13018 NTCUC_Assignment, NTCUK_Copy);
13019 }
13020 RecordModifiableNonNullParam(*this, LHS.get());
13021 break;
13022 case BO_PtrMemD:
13023 case BO_PtrMemI:
13024 ResultTy = CheckPointerToMemberOperands(LHS, RHS, VK, OpLoc,
13025 Opc == BO_PtrMemI);
13026 break;
13027 case BO_Mul:
13028 case BO_Div:
13029 ConvertHalfVec = true;
13030 ResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, false,
13031 Opc == BO_Div);
13032 break;
13033 case BO_Rem:
13034 ResultTy = CheckRemainderOperands(LHS, RHS, OpLoc);
13035 break;
13036 case BO_Add:
13037 ConvertHalfVec = true;
13038 ResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, Opc);
13039 break;
13040 case BO_Sub:
13041 ConvertHalfVec = true;
13042 ResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc);
13043 break;
13044 case BO_Shl:
13045 case BO_Shr:
13046 ResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc);
13047 break;
13048 case BO_LE:
13049 case BO_LT:
13050 case BO_GE:
13051 case BO_GT:
13052 ConvertHalfVec = true;
13053 ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc);
13054 break;
13055 case BO_EQ:
13056 case BO_NE:
13057 ConvertHalfVec = true;
13058 ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc);
13059 break;
13060 case BO_Cmp:
13061 ConvertHalfVec = true;
13062 ResultTy = CheckCompareOperands(LHS, RHS, OpLoc, Opc);
13063 assert(ResultTy.isNull() || ResultTy->getAsCXXRecordDecl());
13064 break;
13065 case BO_And:
13066 checkObjCPointerIntrospection(*this, LHS, RHS, OpLoc);
13067 LLVM_FALLTHROUGH;
13068 case BO_Xor:
13069 case BO_Or:
13070 ResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, Opc);
13071 break;
13072 case BO_LAnd:
13073 case BO_LOr:
13074 ConvertHalfVec = true;
13075 ResultTy = CheckLogicalOperands(LHS, RHS, OpLoc, Opc);
13076 break;
13077 case BO_MulAssign:
13078 case BO_DivAssign:
13079 ConvertHalfVec = true;
13080 CompResultTy = CheckMultiplyDivideOperands(LHS, RHS, OpLoc, true,
13081 Opc == BO_DivAssign);
13082 CompLHSTy = CompResultTy;
13083 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
13084 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
13085 break;
13086 case BO_RemAssign:
13087 CompResultTy = CheckRemainderOperands(LHS, RHS, OpLoc, true);
13088 CompLHSTy = CompResultTy;
13089 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
13090 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
13091 break;
13092 case BO_AddAssign:
13093 ConvertHalfVec = true;
13094 CompResultTy = CheckAdditionOperands(LHS, RHS, OpLoc, Opc, &CompLHSTy);
13095 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
13096 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
13097 break;
13098 case BO_SubAssign:
13099 ConvertHalfVec = true;
13100 CompResultTy = CheckSubtractionOperands(LHS, RHS, OpLoc, &CompLHSTy);
13101 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
13102 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
13103 break;
13104 case BO_ShlAssign:
13105 case BO_ShrAssign:
13106 CompResultTy = CheckShiftOperands(LHS, RHS, OpLoc, Opc, true);
13107 CompLHSTy = CompResultTy;
13108 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
13109 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
13110 break;
13111 case BO_AndAssign:
13112 case BO_OrAssign: // fallthrough
13113 DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc, true);
13114 LLVM_FALLTHROUGH;
13115 case BO_XorAssign:
13116 CompResultTy = CheckBitwiseOperands(LHS, RHS, OpLoc, Opc);
13117 CompLHSTy = CompResultTy;
13118 if (!CompResultTy.isNull() && !LHS.isInvalid() && !RHS.isInvalid())
13119 ResultTy = CheckAssignmentOperands(LHS.get(), RHS, OpLoc, CompResultTy);
13120 break;
13121 case BO_Comma:
13122 ResultTy = CheckCommaOperands(*this, LHS, RHS, OpLoc);
13123 if (getLangOpts().CPlusPlus && !RHS.isInvalid()) {
13124 VK = RHS.get()->getValueKind();
13125 OK = RHS.get()->getObjectKind();
13126 }
13127 break;
13128 }
13129 if (ResultTy.isNull() || LHS.isInvalid() || RHS.isInvalid())
13130 return ExprError();
13131
13132 if (ResultTy->isRealFloatingType() &&
13133 (getLangOpts().getFPRoundingMode() != LangOptions::FPR_ToNearest ||
13134 getLangOpts().getFPExceptionMode() != LangOptions::FPE_Ignore))
13135 // Mark the current function as usng floating point constrained intrinsics
13136 if (FunctionDecl *F = dyn_cast<FunctionDecl>(CurContext)) {
13137 F->setUsesFPIntrin(true);
13138 }
13139
13140 // Some of the binary operations require promoting operands of half vector to
13141 // float vectors and truncating the result back to half vector. For now, we do
13142 // this only when HalfArgsAndReturn is set (that is, when the target is arm or
13143 // arm64).
13144 assert(isVector(RHS.get()->getType(), Context.HalfTy) ==
13145 isVector(LHS.get()->getType(), Context.HalfTy) &&
13146 "both sides are half vectors or neither sides are");
13147 ConvertHalfVec = needsConversionOfHalfVec(ConvertHalfVec, Context,
13148 LHS.get()->getType());
13149
13150 // Check for array bounds violations for both sides of the BinaryOperator
13151 CheckArrayAccess(LHS.get());
13152 CheckArrayAccess(RHS.get());
13153
13154 if (const ObjCIsaExpr *OISA = dyn_cast<ObjCIsaExpr>(LHS.get()->IgnoreParenCasts())) {
13155 NamedDecl *ObjectSetClass = LookupSingleName(TUScope,
13156 &Context.Idents.get("object_setClass"),
13157 SourceLocation(), LookupOrdinaryName);
13158 if (ObjectSetClass && isa<ObjCIsaExpr>(LHS.get())) {
13159 SourceLocation RHSLocEnd = getLocForEndOfToken(RHS.get()->getEndLoc());
13160 Diag(LHS.get()->getExprLoc(), diag::warn_objc_isa_assign)
13161 << FixItHint::CreateInsertion(LHS.get()->getBeginLoc(),
13162 "object_setClass(")
13163 << FixItHint::CreateReplacement(SourceRange(OISA->getOpLoc(), OpLoc),
13164 ",")
13165 << FixItHint::CreateInsertion(RHSLocEnd, ")");
13166 }
13167 else
13168 Diag(LHS.get()->getExprLoc(), diag::warn_objc_isa_assign);
13169 }
13170 else if (const ObjCIvarRefExpr *OIRE =
13171 dyn_cast<ObjCIvarRefExpr>(LHS.get()->IgnoreParenCasts()))
13172 DiagnoseDirectIsaAccess(*this, OIRE, OpLoc, RHS.get());
13173
13174 // Opc is not a compound assignment if CompResultTy is null.
13175 if (CompResultTy.isNull()) {
13176 if (ConvertHalfVec)
13177 return convertHalfVecBinOp(*this, LHS, RHS, Opc, ResultTy, VK, OK, false,
13178 OpLoc, FPFeatures);
13179 return new (Context) BinaryOperator(LHS.get(), RHS.get(), Opc, ResultTy, VK,
13180 OK, OpLoc, FPFeatures);
13181 }
13182
13183 // Handle compound assignments.
13184 if (getLangOpts().CPlusPlus && LHS.get()->getObjectKind() !=
13185 OK_ObjCProperty) {
13186 VK = VK_LValue;
13187 OK = LHS.get()->getObjectKind();
13188 }
13189
13190 if (ConvertHalfVec)
13191 return convertHalfVecBinOp(*this, LHS, RHS, Opc, ResultTy, VK, OK, true,
13192 OpLoc, FPFeatures);
13193
13194 return new (Context) CompoundAssignOperator(
13195 LHS.get(), RHS.get(), Opc, ResultTy, VK, OK, CompLHSTy, CompResultTy,
13196 OpLoc, FPFeatures);
13197 }
13198
13199 /// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
13200 /// operators are mixed in a way that suggests that the programmer forgot that
13201 /// comparison operators have higher precedence. The most typical example of
13202 /// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
13203 static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
13204 SourceLocation OpLoc, Expr *LHSExpr,
13205 Expr *RHSExpr) {
13206 BinaryOperator *LHSBO = dyn_cast<BinaryOperator>(LHSExpr);
13207 BinaryOperator *RHSBO = dyn_cast<BinaryOperator>(RHSExpr);
13208
13209 // Check that one of the sides is a comparison operator and the other isn't.
13210 bool isLeftComp = LHSBO && LHSBO->isComparisonOp();
13211 bool isRightComp = RHSBO && RHSBO->isComparisonOp();
13212 if (isLeftComp == isRightComp)
13213 return;
13214
13215 // Bitwise operations are sometimes used as eager logical ops.
13216 // Don't diagnose this.
13217 bool isLeftBitwise = LHSBO && LHSBO->isBitwiseOp();
13218 bool isRightBitwise = RHSBO && RHSBO->isBitwiseOp();
13219 if (isLeftBitwise || isRightBitwise)
13220 return;
13221
13222 SourceRange DiagRange = isLeftComp
13223 ? SourceRange(LHSExpr->getBeginLoc(), OpLoc)
13224 : SourceRange(OpLoc, RHSExpr->getEndLoc());
13225 StringRef OpStr = isLeftComp ? LHSBO->getOpcodeStr() : RHSBO->getOpcodeStr();
13226 SourceRange ParensRange =
13227 isLeftComp
13228 ? SourceRange(LHSBO->getRHS()->getBeginLoc(), RHSExpr->getEndLoc())
13229 : SourceRange(LHSExpr->getBeginLoc(), RHSBO->getLHS()->getEndLoc());
13230
13231 Self.Diag(OpLoc, diag::warn_precedence_bitwise_rel)
13232 << DiagRange << BinaryOperator::getOpcodeStr(Opc) << OpStr;
13233 SuggestParentheses(Self, OpLoc,
13234 Self.PDiag(diag::note_precedence_silence) << OpStr,
13235 (isLeftComp ? LHSExpr : RHSExpr)->getSourceRange());
13236 SuggestParentheses(Self, OpLoc,
13237 Self.PDiag(diag::note_precedence_bitwise_first)
13238 << BinaryOperator::getOpcodeStr(Opc),
13239 ParensRange);
13240 }
13241
13242 /// It accepts a '&&' expr that is inside a '||' one.
13243 /// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
13244 /// in parentheses.
13245 static void
13246 EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
13247 BinaryOperator *Bop) {
13248 assert(Bop->getOpcode() == BO_LAnd);
13249 Self.Diag(Bop->getOperatorLoc(), diag::warn_logical_and_in_logical_or)
13250 << Bop->getSourceRange() << OpLoc;
13251 SuggestParentheses(Self, Bop->getOperatorLoc(),
13252 Self.PDiag(diag::note_precedence_silence)
13253 << Bop->getOpcodeStr(),
13254 Bop->getSourceRange());
13255 }
13256
13257 /// Returns true if the given expression can be evaluated as a constant
13258 /// 'true'.
13259 static bool EvaluatesAsTrue(Sema &S, Expr *E) {
13260 bool Res;
13261 return !E->isValueDependent() &&
13262 E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && Res;
13263 }
13264
13265 /// Returns true if the given expression can be evaluated as a constant
13266 /// 'false'.
13267 static bool EvaluatesAsFalse(Sema &S, Expr *E) {
13268 bool Res;
13269 return !E->isValueDependent() &&
13270 E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && !Res;
13271 }
13272
13273 /// Look for '&&' in the left hand of a '||' expr.
13274 static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
13275 Expr *LHSExpr, Expr *RHSExpr) {
13276 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(LHSExpr)) {
13277 if (Bop->getOpcode() == BO_LAnd) {
13278 // If it's "a && b || 0" don't warn since the precedence doesn't matter.
13279 if (EvaluatesAsFalse(S, RHSExpr))
13280 return;
13281 // If it's "1 && a || b" don't warn since the precedence doesn't matter.
13282 if (!EvaluatesAsTrue(S, Bop->getLHS()))
13283 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
13284 } else if (Bop->getOpcode() == BO_LOr) {
13285 if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
13286 // If it's "a || b && 1 || c" we didn't warn earlier for
13287 // "a || b && 1", but warn now.
13288 if (RBop->getOpcode() == BO_LAnd && EvaluatesAsTrue(S, RBop->getRHS()))
13289 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
13290 }
13291 }
13292 }
13293 }
13294
13295 /// Look for '&&' in the right hand of a '||' expr.
13296 static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
13297 Expr *LHSExpr, Expr *RHSExpr) {
13298 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(RHSExpr)) {
13299 if (Bop->getOpcode() == BO_LAnd) {
13300 // If it's "0 || a && b" don't warn since the precedence doesn't matter.
13301 if (EvaluatesAsFalse(S, LHSExpr))
13302 return;
13303 // If it's "a || b && 1" don't warn since the precedence doesn't matter.
13304 if (!EvaluatesAsTrue(S, Bop->getRHS()))
13305 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
13306 }
13307 }
13308 }
13309
13310 /// Look for bitwise op in the left or right hand of a bitwise op with
13311 /// lower precedence and emit a diagnostic together with a fixit hint that wraps
13312 /// the '&' expression in parentheses.
13313 static void DiagnoseBitwiseOpInBitwiseOp(Sema &S, BinaryOperatorKind Opc,
13314 SourceLocation OpLoc, Expr *SubExpr) {
13315 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(SubExpr)) {
13316 if (Bop->isBitwiseOp() && Bop->getOpcode() < Opc) {
13317 S.Diag(Bop->getOperatorLoc(), diag::warn_bitwise_op_in_bitwise_op)
13318 << Bop->getOpcodeStr() << BinaryOperator::getOpcodeStr(Opc)
13319 << Bop->getSourceRange() << OpLoc;
13320 SuggestParentheses(S, Bop->getOperatorLoc(),
13321 S.PDiag(diag::note_precedence_silence)
13322 << Bop->getOpcodeStr(),
13323 Bop->getSourceRange());
13324 }
13325 }
13326 }
13327
13328 static void DiagnoseAdditionInShift(Sema &S, SourceLocation OpLoc,
13329 Expr *SubExpr, StringRef Shift) {
13330 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(SubExpr)) {
13331 if (Bop->getOpcode() == BO_Add || Bop->getOpcode() == BO_Sub) {
13332 StringRef Op = Bop->getOpcodeStr();
13333 S.Diag(Bop->getOperatorLoc(), diag::warn_addition_in_bitshift)
13334 << Bop->getSourceRange() << OpLoc << Shift << Op;
13335 SuggestParentheses(S, Bop->getOperatorLoc(),
13336 S.PDiag(diag::note_precedence_silence) << Op,
13337 Bop->getSourceRange());
13338 }
13339 }
13340 }
13341
13342 static void DiagnoseShiftCompare(Sema &S, SourceLocation OpLoc,
13343 Expr *LHSExpr, Expr *RHSExpr) {
13344 CXXOperatorCallExpr *OCE = dyn_cast<CXXOperatorCallExpr>(LHSExpr);
13345 if (!OCE)
13346 return;
13347
13348 FunctionDecl *FD = OCE->getDirectCallee();
13349 if (!FD || !FD->isOverloadedOperator())
13350 return;
13351
13352 OverloadedOperatorKind Kind = FD->getOverloadedOperator();
13353 if (Kind != OO_LessLess && Kind != OO_GreaterGreater)
13354 return;
13355
13356 S.Diag(OpLoc, diag::warn_overloaded_shift_in_comparison)
13357 << LHSExpr->getSourceRange() << RHSExpr->getSourceRange()
13358 << (Kind == OO_LessLess);
13359 SuggestParentheses(S, OCE->getOperatorLoc(),
13360 S.PDiag(diag::note_precedence_silence)
13361 << (Kind == OO_LessLess ? "<<" : ">>"),
13362 OCE->getSourceRange());
13363 SuggestParentheses(
13364 S, OpLoc, S.PDiag(diag::note_evaluate_comparison_first),
13365 SourceRange(OCE->getArg(1)->getBeginLoc(), RHSExpr->getEndLoc()));
13366 }
13367
13368 /// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
13369 /// precedence.
13370 static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
13371 SourceLocation OpLoc, Expr *LHSExpr,
13372 Expr *RHSExpr){
13373 // Diagnose "arg1 'bitwise' arg2 'eq' arg3".
13374 if (BinaryOperator::isBitwiseOp(Opc))
13375 DiagnoseBitwisePrecedence(Self, Opc, OpLoc, LHSExpr, RHSExpr);
13376
13377 // Diagnose "arg1 & arg2 | arg3"
13378 if ((Opc == BO_Or || Opc == BO_Xor) &&
13379 !OpLoc.isMacroID()/* Don't warn in macros. */) {
13380 DiagnoseBitwiseOpInBitwiseOp(Self, Opc, OpLoc, LHSExpr);
13381 DiagnoseBitwiseOpInBitwiseOp(Self, Opc, OpLoc, RHSExpr);
13382 }
13383
13384 // Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
13385 // We don't warn for 'assert(a || b && "bad")' since this is safe.
13386 if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
13387 DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, LHSExpr, RHSExpr);
13388 DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, LHSExpr, RHSExpr);
13389 }
13390
13391 if ((Opc == BO_Shl && LHSExpr->getType()->isIntegralType(Self.getASTContext()))
13392 || Opc == BO_Shr) {
13393 StringRef Shift = BinaryOperator::getOpcodeStr(Opc);
13394 DiagnoseAdditionInShift(Self, OpLoc, LHSExpr, Shift);
13395 DiagnoseAdditionInShift(Self, OpLoc, RHSExpr, Shift);
13396 }
13397
13398 // Warn on overloaded shift operators and comparisons, such as:
13399 // cout << 5 == 4;
13400 if (BinaryOperator::isComparisonOp(Opc))
13401 DiagnoseShiftCompare(Self, OpLoc, LHSExpr, RHSExpr);
13402 }
13403
13404 // Binary Operators. 'Tok' is the token for the operator.
13405 ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
13406 tok::TokenKind Kind,
13407 Expr *LHSExpr, Expr *RHSExpr) {
13408 BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
13409 assert(LHSExpr && "ActOnBinOp(): missing left expression");
13410 assert(RHSExpr && "ActOnBinOp(): missing right expression");
13411
13412 // Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
13413 DiagnoseBinOpPrecedence(*this, Opc, TokLoc, LHSExpr, RHSExpr);
13414
13415 return BuildBinOp(S, TokLoc, Opc, LHSExpr, RHSExpr);
13416 }
13417
13418 /// Build an overloaded binary operator expression in the given scope.
13419 static ExprResult BuildOverloadedBinOp(Sema &S, Scope *Sc, SourceLocation OpLoc,
13420 BinaryOperatorKind Opc,
13421 Expr *LHS, Expr *RHS) {
13422 switch (Opc) {
13423 case BO_Assign:
13424 case BO_DivAssign:
13425 case BO_RemAssign:
13426 case BO_SubAssign:
13427 case BO_AndAssign:
13428 case BO_OrAssign:
13429 case BO_XorAssign:
13430 DiagnoseSelfAssignment(S, LHS, RHS, OpLoc, false);
13431 CheckIdentityFieldAssignment(LHS, RHS, OpLoc, S);
13432 break;
13433 default:
13434 break;
13435 }
13436
13437 // Find all of the overloaded operators visible from this
13438 // point. We perform both an operator-name lookup from the local
13439 // scope and an argument-dependent lookup based on the types of
13440 // the arguments.
13441 UnresolvedSet<16> Functions;
13442 OverloadedOperatorKind OverOp
13443 = BinaryOperator::getOverloadedOperator(Opc);
13444 if (Sc && OverOp != OO_None && OverOp != OO_Equal)
13445 S.LookupOverloadedOperatorName(OverOp, Sc, LHS->getType(),
13446 RHS->getType(), Functions);
13447
13448 // In C++20 onwards, we may have a second operator to look up.
13449 if (S.getLangOpts().CPlusPlus2a) {
13450 if (OverloadedOperatorKind ExtraOp = getRewrittenOverloadedOperator(OverOp))
13451 S.LookupOverloadedOperatorName(ExtraOp, Sc, LHS->getType(),
13452 RHS->getType(), Functions);
13453 }
13454
13455 // Build the (potentially-overloaded, potentially-dependent)
13456 // binary operation.
13457 return S.CreateOverloadedBinOp(OpLoc, Opc, Functions, LHS, RHS);
13458 }
13459
13460 ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
13461 BinaryOperatorKind Opc,
13462 Expr *LHSExpr, Expr *RHSExpr) {
13463 ExprResult LHS, RHS;
13464 std::tie(LHS, RHS) = CorrectDelayedTyposInBinOp(*this, Opc, LHSExpr, RHSExpr);
13465 if (!LHS.isUsable() || !RHS.isUsable())
13466 return ExprError();
13467 LHSExpr = LHS.get();
13468 RHSExpr = RHS.get();
13469
13470 // We want to end up calling one of checkPseudoObjectAssignment
13471 // (if the LHS is a pseudo-object), BuildOverloadedBinOp (if
13472 // both expressions are overloadable or either is type-dependent),
13473 // or CreateBuiltinBinOp (in any other case). We also want to get
13474 // any placeholder types out of the way.
13475
13476 // Handle pseudo-objects in the LHS.
13477 if (const BuiltinType *pty = LHSExpr->getType()->getAsPlaceholderType()) {
13478 // Assignments with a pseudo-object l-value need special analysis.
13479 if (pty->getKind() == BuiltinType::PseudoObject &&
13480 BinaryOperator::isAssignmentOp(Opc))
13481 return checkPseudoObjectAssignment(S, OpLoc, Opc, LHSExpr, RHSExpr);
13482
13483 // Don't resolve overloads if the other type is overloadable.
13484 if (getLangOpts().CPlusPlus && pty->getKind() == BuiltinType::Overload) {
13485 // We can't actually test that if we still have a placeholder,
13486 // though. Fortunately, none of the exceptions we see in that
13487 // code below are valid when the LHS is an overload set. Note
13488 // that an overload set can be dependently-typed, but it never
13489 // instantiates to having an overloadable type.
13490 ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
13491 if (resolvedRHS.isInvalid()) return ExprError();
13492 RHSExpr = resolvedRHS.get();
13493
13494 if (RHSExpr->isTypeDependent() ||
13495 RHSExpr->getType()->isOverloadableType())
13496 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
13497 }
13498
13499 // If we're instantiating "a.x < b" or "A::x < b" and 'x' names a function
13500 // template, diagnose the missing 'template' keyword instead of diagnosing
13501 // an invalid use of a bound member function.
13502 //
13503 // Note that "A::x < b" might be valid if 'b' has an overloadable type due
13504 // to C++1z [over.over]/1.4, but we already checked for that case above.
13505 if (Opc == BO_LT && inTemplateInstantiation() &&
13506 (pty->getKind() == BuiltinType::BoundMember ||
13507 pty->getKind() == BuiltinType::Overload)) {
13508 auto *OE = dyn_cast<OverloadExpr>(LHSExpr);
13509 if (OE && !OE->hasTemplateKeyword() && !OE->hasExplicitTemplateArgs() &&
13510 std::any_of(OE->decls_begin(), OE->decls_end(), [](NamedDecl *ND) {
13511 return isa<FunctionTemplateDecl>(ND);
13512 })) {
13513 Diag(OE->getQualifier() ? OE->getQualifierLoc().getBeginLoc()
13514 : OE->getNameLoc(),
13515 diag::err_template_kw_missing)
13516 << OE->getName().getAsString() << "";
13517 return ExprError();
13518 }
13519 }
13520
13521 ExprResult LHS = CheckPlaceholderExpr(LHSExpr);
13522 if (LHS.isInvalid()) return ExprError();
13523 LHSExpr = LHS.get();
13524 }
13525
13526 // Handle pseudo-objects in the RHS.
13527 if (const BuiltinType *pty = RHSExpr->getType()->getAsPlaceholderType()) {
13528 // An overload in the RHS can potentially be resolved by the type
13529 // being assigned to.
13530 if (Opc == BO_Assign && pty->getKind() == BuiltinType::Overload) {
13531 if (getLangOpts().CPlusPlus &&
13532 (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent() ||
13533 LHSExpr->getType()->isOverloadableType()))
13534 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
13535
13536 return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
13537 }
13538
13539 // Don't resolve overloads if the other type is overloadable.
13540 if (getLangOpts().CPlusPlus && pty->getKind() == BuiltinType::Overload &&
13541 LHSExpr->getType()->isOverloadableType())
13542 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
13543
13544 ExprResult resolvedRHS = CheckPlaceholderExpr(RHSExpr);
13545 if (!resolvedRHS.isUsable()) return ExprError();
13546 RHSExpr = resolvedRHS.get();
13547 }
13548
13549 if (getLangOpts().CPlusPlus) {
13550 // If either expression is type-dependent, always build an
13551 // overloaded op.
13552 if (LHSExpr->isTypeDependent() || RHSExpr->isTypeDependent())
13553 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
13554
13555 // Otherwise, build an overloaded op if either expression has an
13556 // overloadable type.
13557 if (LHSExpr->getType()->isOverloadableType() ||
13558 RHSExpr->getType()->isOverloadableType())
13559 return BuildOverloadedBinOp(*this, S, OpLoc, Opc, LHSExpr, RHSExpr);
13560 }
13561
13562 // Build a built-in binary operation.
13563 return CreateBuiltinBinOp(OpLoc, Opc, LHSExpr, RHSExpr);
13564 }
13565
13566 static bool isOverflowingIntegerType(ASTContext &Ctx, QualType T) {
13567 if (T.isNull() || T->isDependentType())
13568 return false;
13569
13570 if (!T->isPromotableIntegerType())
13571 return true;
13572
13573 return Ctx.getIntWidth(T) >= Ctx.getIntWidth(Ctx.IntTy);
13574 }
13575
13576 ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
13577 UnaryOperatorKind Opc,
13578 Expr *InputExpr) {
13579 ExprResult Input = InputExpr;
13580 ExprValueKind VK = VK_RValue;
13581 ExprObjectKind OK = OK_Ordinary;
13582 QualType resultType;
13583 bool CanOverflow = false;
13584
13585 bool ConvertHalfVec = false;
13586 if (getLangOpts().OpenCL) {
13587 QualType Ty = InputExpr->getType();
13588 // The only legal unary operation for atomics is '&'.
13589 if ((Opc != UO_AddrOf && Ty->isAtomicType()) ||
13590 // OpenCL special types - image, sampler, pipe, and blocks are to be used
13591 // only with a builtin functions and therefore should be disallowed here.
13592 (Ty->isImageType() || Ty->isSamplerT() || Ty->isPipeType()
13593 || Ty->isBlockPointerType())) {
13594 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
13595 << InputExpr->getType()
13596 << Input.get()->getSourceRange());
13597 }
13598 }
13599 // Diagnose operations on the unsupported types for OpenMP device compilation.
13600 if (getLangOpts().OpenMP && getLangOpts().OpenMPIsDevice) {
13601 if (UnaryOperator::isIncrementDecrementOp(Opc) ||
13602 UnaryOperator::isArithmeticOp(Opc))
13603 checkOpenMPDeviceExpr(InputExpr);
13604 }
13605
13606 switch (Opc) {
13607 case UO_PreInc:
13608 case UO_PreDec:
13609 case UO_PostInc:
13610 case UO_PostDec:
13611 resultType = CheckIncrementDecrementOperand(*this, Input.get(), VK, OK,
13612 OpLoc,
13613 Opc == UO_PreInc ||
13614 Opc == UO_PostInc,
13615 Opc == UO_PreInc ||
13616 Opc == UO_PreDec);
13617 CanOverflow = isOverflowingIntegerType(Context, resultType);
13618 break;
13619 case UO_AddrOf:
13620 resultType = CheckAddressOfOperand(Input, OpLoc);
13621 CheckAddressOfNoDeref(InputExpr);
13622 RecordModifiableNonNullParam(*this, InputExpr);
13623 break;
13624 case UO_Deref: {
13625 Input = DefaultFunctionArrayLvalueConversion(Input.get());
13626 if (Input.isInvalid()) return ExprError();
13627 resultType = CheckIndirectionOperand(*this, Input.get(), VK, OpLoc);
13628 break;
13629 }
13630 case UO_Plus:
13631 case UO_Minus:
13632 CanOverflow = Opc == UO_Minus &&
13633 isOverflowingIntegerType(Context, Input.get()->getType());
13634 Input = UsualUnaryConversions(Input.get());
13635 if (Input.isInvalid()) return ExprError();
13636 // Unary plus and minus require promoting an operand of half vector to a
13637 // float vector and truncating the result back to a half vector. For now, we
13638 // do this only when HalfArgsAndReturns is set (that is, when the target is
13639 // arm or arm64).
13640 ConvertHalfVec =
13641 needsConversionOfHalfVec(true, Context, Input.get()->getType());
13642
13643 // If the operand is a half vector, promote it to a float vector.
13644 if (ConvertHalfVec)
13645 Input = convertVector(Input.get(), Context.FloatTy, *this);
13646 resultType = Input.get()->getType();
13647 if (resultType->isDependentType())
13648 break;
13649 if (resultType->isArithmeticType()) // C99 6.5.3.3p1
13650 break;
13651 else if (resultType->isVectorType() &&
13652 // The z vector extensions don't allow + or - with bool vectors.
13653 (!Context.getLangOpts().ZVector ||
13654 resultType->castAs<VectorType>()->getVectorKind() !=
13655 VectorType::AltiVecBool))
13656 break;
13657 else if (getLangOpts().CPlusPlus && // C++ [expr.unary.op]p6
13658 Opc == UO_Plus &&
13659 resultType->isPointerType())
13660 break;
13661
13662 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
13663 << resultType << Input.get()->getSourceRange());
13664
13665 case UO_Not: // bitwise complement
13666 Input = UsualUnaryConversions(Input.get());
13667 if (Input.isInvalid())
13668 return ExprError();
13669 resultType = Input.get()->getType();
13670 if (resultType->isDependentType())
13671 break;
13672 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
13673 if (resultType->isComplexType() || resultType->isComplexIntegerType())
13674 // C99 does not support '~' for complex conjugation.
13675 Diag(OpLoc, diag::ext_integer_complement_complex)
13676 << resultType << Input.get()->getSourceRange();
13677 else if (resultType->hasIntegerRepresentation())
13678 break;
13679 else if (resultType->isExtVectorType() && Context.getLangOpts().OpenCL) {
13680 // OpenCL v1.1 s6.3.f: The bitwise operator not (~) does not operate
13681 // on vector float types.
13682 QualType T = resultType->castAs<ExtVectorType>()->getElementType();
13683 if (!T->isIntegerType())
13684 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
13685 << resultType << Input.get()->getSourceRange());
13686 } else {
13687 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
13688 << resultType << Input.get()->getSourceRange());
13689 }
13690 break;
13691
13692 case UO_LNot: // logical negation
13693 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
13694 Input = DefaultFunctionArrayLvalueConversion(Input.get());
13695 if (Input.isInvalid()) return ExprError();
13696 resultType = Input.get()->getType();
13697
13698 // Though we still have to promote half FP to float...
13699 if (resultType->isHalfType() && !Context.getLangOpts().NativeHalfType) {
13700 Input = ImpCastExprToType(Input.get(), Context.FloatTy, CK_FloatingCast).get();
13701 resultType = Context.FloatTy;
13702 }
13703
13704 if (resultType->isDependentType())
13705 break;
13706 if (resultType->isScalarType() && !isScopedEnumerationType(resultType)) {
13707 // C99 6.5.3.3p1: ok, fallthrough;
13708 if (Context.getLangOpts().CPlusPlus) {
13709 // C++03 [expr.unary.op]p8, C++0x [expr.unary.op]p9:
13710 // operand contextually converted to bool.
13711 Input = ImpCastExprToType(Input.get(), Context.BoolTy,
13712 ScalarTypeToBooleanCastKind(resultType));
13713 } else if (Context.getLangOpts().OpenCL &&
13714 Context.getLangOpts().OpenCLVersion < 120) {
13715 // OpenCL v1.1 6.3.h: The logical operator not (!) does not
13716 // operate on scalar float types.
13717 if (!resultType->isIntegerType() && !resultType->isPointerType())
13718 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
13719 << resultType << Input.get()->getSourceRange());
13720 }
13721 } else if (resultType->isExtVectorType()) {
13722 if (Context.getLangOpts().OpenCL &&
13723 Context.getLangOpts().OpenCLVersion < 120 &&
13724 !Context.getLangOpts().OpenCLCPlusPlus) {
13725 // OpenCL v1.1 6.3.h: The logical operator not (!) does not
13726 // operate on vector float types.
13727 QualType T = resultType->castAs<ExtVectorType>()->getElementType();
13728 if (!T->isIntegerType())
13729 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
13730 << resultType << Input.get()->getSourceRange());
13731 }
13732 // Vector logical not returns the signed variant of the operand type.
13733 resultType = GetSignedVectorType(resultType);
13734 break;
13735 } else {
13736 // FIXME: GCC's vector extension permits the usage of '!' with a vector
13737 // type in C++. We should allow that here too.
13738 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
13739 << resultType << Input.get()->getSourceRange());
13740 }
13741
13742 // LNot always has type int. C99 6.5.3.3p5.
13743 // In C++, it's bool. C++ 5.3.1p8
13744 resultType = Context.getLogicalOperationType();
13745 break;
13746 case UO_Real:
13747 case UO_Imag:
13748 resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
13749 // _Real maps ordinary l-values into ordinary l-values. _Imag maps ordinary
13750 // complex l-values to ordinary l-values and all other values to r-values.
13751 if (Input.isInvalid()) return ExprError();
13752 if (Opc == UO_Real || Input.get()->getType()->isAnyComplexType()) {
13753 if (Input.get()->getValueKind() != VK_RValue &&
13754 Input.get()->getObjectKind() == OK_Ordinary)
13755 VK = Input.get()->getValueKind();
13756 } else if (!getLangOpts().CPlusPlus) {
13757 // In C, a volatile scalar is read by __imag. In C++, it is not.
13758 Input = DefaultLvalueConversion(Input.get());
13759 }
13760 break;
13761 case UO_Extension:
13762 resultType = Input.get()->getType();
13763 VK = Input.get()->getValueKind();
13764 OK = Input.get()->getObjectKind();
13765 break;
13766 case UO_Coawait:
13767 // It's unnecessary to represent the pass-through operator co_await in the
13768 // AST; just return the input expression instead.
13769 assert(!Input.get()->getType()->isDependentType() &&
13770 "the co_await expression must be non-dependant before "
13771 "building operator co_await");
13772 return Input;
13773 }
13774 if (resultType.isNull() || Input.isInvalid())
13775 return ExprError();
13776
13777 // Check for array bounds violations in the operand of the UnaryOperator,
13778 // except for the '*' and '&' operators that have to be handled specially
13779 // by CheckArrayAccess (as there are special cases like &array[arraysize]
13780 // that are explicitly defined as valid by the standard).
13781 if (Opc != UO_AddrOf && Opc != UO_Deref)
13782 CheckArrayAccess(Input.get());
13783
13784 auto *UO = new (Context)
13785 UnaryOperator(Input.get(), Opc, resultType, VK, OK, OpLoc, CanOverflow);
13786
13787 if (Opc == UO_Deref && UO->getType()->hasAttr(attr::NoDeref) &&
13788 !isa<ArrayType>(UO->getType().getDesugaredType(Context)))
13789 ExprEvalContexts.back().PossibleDerefs.insert(UO);
13790
13791 // Convert the result back to a half vector.
13792 if (ConvertHalfVec)
13793 return convertVector(UO, Context.HalfTy, *this);
13794 return UO;
13795 }
13796
13797 /// Determine whether the given expression is a qualified member
13798 /// access expression, of a form that could be turned into a pointer to member
13799 /// with the address-of operator.
13800 bool Sema::isQualifiedMemberAccess(Expr *E) {
13801 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
13802 if (!DRE->getQualifier())
13803 return false;
13804
13805 ValueDecl *VD = DRE->getDecl();
13806 if (!VD->isCXXClassMember())
13807 return false;
13808
13809 if (isa<FieldDecl>(VD) || isa<IndirectFieldDecl>(VD))
13810 return true;
13811 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(VD))
13812 return Method->isInstance();
13813
13814 return false;
13815 }
13816
13817 if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
13818 if (!ULE->getQualifier())
13819 return false;
13820
13821 for (NamedDecl *D : ULE->decls()) {
13822 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
13823 if (Method->isInstance())
13824 return true;
13825 } else {
13826 // Overload set does not contain methods.
13827 break;
13828 }
13829 }
13830
13831 return false;
13832 }
13833
13834 return false;
13835 }
13836
13837 ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
13838 UnaryOperatorKind Opc, Expr *Input) {
13839 // First things first: handle placeholders so that the
13840 // overloaded-operator check considers the right type.
13841 if (const BuiltinType *pty = Input->getType()->getAsPlaceholderType()) {
13842 // Increment and decrement of pseudo-object references.
13843 if (pty->getKind() == BuiltinType::PseudoObject &&
13844 UnaryOperator::isIncrementDecrementOp(Opc))
13845 return checkPseudoObjectIncDec(S, OpLoc, Opc, Input);
13846
13847 // extension is always a builtin operator.
13848 if (Opc == UO_Extension)
13849 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
13850
13851 // & gets special logic for several kinds of placeholder.
13852 // The builtin code knows what to do.
13853 if (Opc == UO_AddrOf &&
13854 (pty->getKind() == BuiltinType::Overload ||
13855 pty->getKind() == BuiltinType::UnknownAny ||
13856 pty->getKind() == BuiltinType::BoundMember))
13857 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
13858
13859 // Anything else needs to be handled now.
13860 ExprResult Result = CheckPlaceholderExpr(Input);
13861 if (Result.isInvalid()) return ExprError();
13862 Input = Result.get();
13863 }
13864
13865 if (getLangOpts().CPlusPlus && Input->getType()->isOverloadableType() &&
13866 UnaryOperator::getOverloadedOperator(Opc) != OO_None &&
13867 !(Opc == UO_AddrOf && isQualifiedMemberAccess(Input))) {
13868 // Find all of the overloaded operators visible from this
13869 // point. We perform both an operator-name lookup from the local
13870 // scope and an argument-dependent lookup based on the types of
13871 // the arguments.
13872 UnresolvedSet<16> Functions;
13873 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
13874 if (S && OverOp != OO_None)
13875 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
13876 Functions);
13877
13878 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
13879 }
13880
13881 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
13882 }
13883
13884 // Unary Operators. 'Tok' is the token for the operator.
13885 ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
13886 tok::TokenKind Op, Expr *Input) {
13887 return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input);
13888 }
13889
13890 /// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
13891 ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc,
13892 LabelDecl *TheDecl) {
13893 TheDecl->markUsed(Context);
13894 // Create the AST node. The address of a label always has type 'void*'.
13895 return new (Context) AddrLabelExpr(OpLoc, LabLoc, TheDecl,
13896 Context.getPointerType(Context.VoidTy));
13897 }
13898
13899 void Sema::ActOnStartStmtExpr() {
13900 PushExpressionEvaluationContext(ExprEvalContexts.back().Context);
13901 }
13902
13903 void Sema::ActOnStmtExprError() {
13904 // Note that function is also called by TreeTransform when leaving a
13905 // StmtExpr scope without rebuilding anything.
13906
13907 DiscardCleanupsInEvaluationContext();
13908 PopExpressionEvaluationContext();
13909 }
13910
13911 ExprResult Sema::ActOnStmtExpr(Scope *S, SourceLocation LPLoc, Stmt *SubStmt,
13912 SourceLocation RPLoc) {
13913 return BuildStmtExpr(LPLoc, SubStmt, RPLoc, getTemplateDepth(S));
13914 }
13915
13916 ExprResult Sema::BuildStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
13917 SourceLocation RPLoc, unsigned TemplateDepth) {
13918 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
13919 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
13920
13921 if (hasAnyUnrecoverableErrorsInThisFunction())
13922 DiscardCleanupsInEvaluationContext();
13923 assert(!Cleanup.exprNeedsCleanups() &&
13924 "cleanups within StmtExpr not correctly bound!");
13925 PopExpressionEvaluationContext();
13926
13927 // FIXME: there are a variety of strange constraints to enforce here, for
13928 // example, it is not possible to goto into a stmt expression apparently.
13929 // More semantic analysis is needed.
13930
13931 // If there are sub-stmts in the compound stmt, take the type of the last one
13932 // as the type of the stmtexpr.
13933 QualType Ty = Context.VoidTy;
13934 bool StmtExprMayBindToTemp = false;
13935 if (!Compound->body_empty()) {
13936 // For GCC compatibility we get the last Stmt excluding trailing NullStmts.
13937 if (const auto *LastStmt =
13938 dyn_cast<ValueStmt>(Compound->getStmtExprResult())) {
13939 if (const Expr *Value = LastStmt->getExprStmt()) {
13940 StmtExprMayBindToTemp = true;
13941 Ty = Value->getType();
13942 }
13943 }
13944 }
13945
13946 // FIXME: Check that expression type is complete/non-abstract; statement
13947 // expressions are not lvalues.
13948 Expr *ResStmtExpr =
13949 new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc, TemplateDepth);
13950 if (StmtExprMayBindToTemp)
13951 return MaybeBindToTemporary(ResStmtExpr);
13952 return ResStmtExpr;
13953 }
13954
13955 ExprResult Sema::ActOnStmtExprResult(ExprResult ER) {
13956 if (ER.isInvalid())
13957 return ExprError();
13958
13959 // Do function/array conversion on the last expression, but not
13960 // lvalue-to-rvalue. However, initialize an unqualified type.
13961 ER = DefaultFunctionArrayConversion(ER.get());
13962 if (ER.isInvalid())
13963 return ExprError();
13964 Expr *E = ER.get();
13965
13966 if (E->isTypeDependent())
13967 return E;
13968
13969 // In ARC, if the final expression ends in a consume, splice
13970 // the consume out and bind it later. In the alternate case
13971 // (when dealing with a retainable type), the result
13972 // initialization will create a produce. In both cases the
13973 // result will be +1, and we'll need to balance that out with
13974 // a bind.
13975 auto *Cast = dyn_cast<ImplicitCastExpr>(E);
13976 if (Cast && Cast->getCastKind() == CK_ARCConsumeObject)
13977 return Cast->getSubExpr();
13978
13979 // FIXME: Provide a better location for the initialization.
13980 return PerformCopyInitialization(
13981 InitializedEntity::InitializeStmtExprResult(
13982 E->getBeginLoc(), E->getType().getUnqualifiedType()),
13983 SourceLocation(), E);
13984 }
13985
13986 ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
13987 TypeSourceInfo *TInfo,
13988 ArrayRef<OffsetOfComponent> Components,
13989 SourceLocation RParenLoc) {
13990 QualType ArgTy = TInfo->getType();
13991 bool Dependent = ArgTy->isDependentType();
13992 SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();
13993
13994 // We must have at least one component that refers to the type, and the first
13995 // one is known to be a field designator. Verify that the ArgTy represents
13996 // a struct/union/class.
13997 if (!Dependent && !ArgTy->isRecordType())
13998 return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type)
13999 << ArgTy << TypeRange);
14000
14001 // Type must be complete per C99 7.17p3 because a declaring a variable
14002 // with an incomplete type would be ill-formed.
14003 if (!Dependent
14004 && RequireCompleteType(BuiltinLoc, ArgTy,
14005 diag::err_offsetof_incomplete_type, TypeRange))
14006 return ExprError();
14007
14008 bool DidWarnAboutNonPOD = false;
14009 QualType CurrentType = ArgTy;
14010 SmallVector<OffsetOfNode, 4> Comps;
14011 SmallVector<Expr*, 4> Exprs;
14012 for (const OffsetOfComponent &OC : Components) {
14013 if (OC.isBrackets) {
14014 // Offset of an array sub-field. TODO: Should we allow vector elements?
14015 if (!CurrentType->isDependentType()) {
14016 const ArrayType *AT = Context.getAsArrayType(CurrentType);
14017 if(!AT)
14018 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
14019 << CurrentType);
14020 CurrentType = AT->getElementType();
14021 } else
14022 CurrentType = Context.DependentTy;
14023
14024 ExprResult IdxRval = DefaultLvalueConversion(static_cast<Expr*>(OC.U.E));
14025 if (IdxRval.isInvalid())
14026 return ExprError();
14027 Expr *Idx = IdxRval.get();
14028
14029 // The expression must be an integral expression.
14030 // FIXME: An integral constant expression?
14031 if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
14032 !Idx->getType()->isIntegerType())
14033 return ExprError(
14034 Diag(Idx->getBeginLoc(), diag::err_typecheck_subscript_not_integer)
14035 << Idx->getSourceRange());
14036
14037 // Record this array index.
14038 Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
14039 Exprs.push_back(Idx);
14040 continue;
14041 }
14042
14043 // Offset of a field.
14044 if (CurrentType->isDependentType()) {
14045 // We have the offset of a field, but we can't look into the dependent
14046 // type. Just record the identifier of the field.
14047 Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
14048 CurrentType = Context.DependentTy;
14049 continue;
14050 }
14051
14052 // We need to have a complete type to look into.
14053 if (RequireCompleteType(OC.LocStart, CurrentType,
14054 diag::err_offsetof_incomplete_type))
14055 return ExprError();
14056
14057 // Look for the designated field.
14058 const RecordType *RC = CurrentType->getAs<RecordType>();
14059 if (!RC)
14060 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
14061 << CurrentType);
14062 RecordDecl *RD = RC->getDecl();
14063
14064 // C++ [lib.support.types]p5:
14065 // The macro offsetof accepts a restricted set of type arguments in this
14066 // International Standard. type shall be a POD structure or a POD union
14067 // (clause 9).
14068 // C++11 [support.types]p4:
14069 // If type is not a standard-layout class (Clause 9), the results are
14070 // undefined.
14071 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
14072 bool IsSafe = LangOpts.CPlusPlus11? CRD->isStandardLayout() : CRD->isPOD();
14073 unsigned DiagID =
14074 LangOpts.CPlusPlus11? diag::ext_offsetof_non_standardlayout_type
14075 : diag::ext_offsetof_non_pod_type;
14076
14077 if (!IsSafe && !DidWarnAboutNonPOD &&
14078 DiagRuntimeBehavior(BuiltinLoc, nullptr,
14079 PDiag(DiagID)
14080 << SourceRange(Components[0].LocStart, OC.LocEnd)
14081 << CurrentType))
14082 DidWarnAboutNonPOD = true;
14083 }
14084
14085 // Look for the field.
14086 LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
14087 LookupQualifiedName(R, RD);
14088 FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
14089 IndirectFieldDecl *IndirectMemberDecl = nullptr;
14090 if (!MemberDecl) {
14091 if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
14092 MemberDecl = IndirectMemberDecl->getAnonField();
14093 }
14094
14095 if (!MemberDecl)
14096 return ExprError(Diag(BuiltinLoc, diag::err_no_member)
14097 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart,
14098 OC.LocEnd));
14099
14100 // C99 7.17p3:
14101 // (If the specified member is a bit-field, the behavior is undefined.)
14102 //
14103 // We diagnose this as an error.
14104 if (MemberDecl->isBitField()) {
14105 Diag(OC.LocEnd, diag::err_offsetof_bitfield)
14106 << MemberDecl->getDeclName()
14107 << SourceRange(BuiltinLoc, RParenLoc);
14108 Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
14109 return ExprError();
14110 }
14111
14112 RecordDecl *Parent = MemberDecl->getParent();
14113 if (IndirectMemberDecl)
14114 Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());
14115
14116 // If the member was found in a base class, introduce OffsetOfNodes for
14117 // the base class indirections.
14118 CXXBasePaths Paths;
14119 if (IsDerivedFrom(OC.LocStart, CurrentType, Context.getTypeDeclType(Parent),
14120 Paths)) {
14121 if (Paths.getDetectedVirtual()) {
14122 Diag(OC.LocEnd, diag::err_offsetof_field_of_virtual_base)
14123 << MemberDecl->getDeclName()
14124 << SourceRange(BuiltinLoc, RParenLoc);
14125 return ExprError();
14126 }
14127
14128 CXXBasePath &Path = Paths.front();
14129 for (const CXXBasePathElement &B : Path)
14130 Comps.push_back(OffsetOfNode(B.Base));
14131 }
14132
14133 if (IndirectMemberDecl) {
14134 for (auto *FI : IndirectMemberDecl->chain()) {
14135 assert(isa<FieldDecl>(FI));
14136 Comps.push_back(OffsetOfNode(OC.LocStart,
14137 cast<FieldDecl>(FI), OC.LocEnd));
14138 }
14139 } else
14140 Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));
14141
14142 CurrentType = MemberDecl->getType().getNonReferenceType();
14143 }
14144
14145 return OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc, TInfo,
14146 Comps, Exprs, RParenLoc);
14147 }
14148
14149 ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
14150 SourceLocation BuiltinLoc,
14151 SourceLocation TypeLoc,
14152 ParsedType ParsedArgTy,
14153 ArrayRef<OffsetOfComponent> Components,
14154 SourceLocation RParenLoc) {
14155
14156 TypeSourceInfo *ArgTInfo;
14157 QualType ArgTy = GetTypeFromParser(ParsedArgTy, &ArgTInfo);
14158 if (ArgTy.isNull())
14159 return ExprError();
14160
14161 if (!ArgTInfo)
14162 ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);
14163
14164 return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, Components, RParenLoc);
14165 }
14166
14167
14168 ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
14169 Expr *CondExpr,
14170 Expr *LHSExpr, Expr *RHSExpr,
14171 SourceLocation RPLoc) {
14172 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
14173
14174 ExprValueKind VK = VK_RValue;
14175 ExprObjectKind OK = OK_Ordinary;
14176 QualType resType;
14177 bool ValueDependent = false;
14178 bool CondIsTrue = false;
14179 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
14180 resType = Context.DependentTy;
14181 ValueDependent = true;
14182 } else {
14183 // The conditional expression is required to be a constant expression.
14184 llvm::APSInt condEval(32);
14185 ExprResult CondICE
14186 = VerifyIntegerConstantExpression(CondExpr, &condEval,
14187 diag::err_typecheck_choose_expr_requires_constant, false);
14188 if (CondICE.isInvalid())
14189 return ExprError();
14190 CondExpr = CondICE.get();
14191 CondIsTrue = condEval.getZExtValue();
14192
14193 // If the condition is > zero, then the AST type is the same as the LHSExpr.
14194 Expr *ActiveExpr = CondIsTrue ? LHSExpr : RHSExpr;
14195
14196 resType = ActiveExpr->getType();
14197 ValueDependent = ActiveExpr->isValueDependent();
14198 VK = ActiveExpr->getValueKind();
14199 OK = ActiveExpr->getObjectKind();
14200 }
14201
14202 return new (Context)
14203 ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, VK, OK, RPLoc,
14204 CondIsTrue, resType->isDependentType(), ValueDependent);
14205 }
14206
14207 //===----------------------------------------------------------------------===//
14208 // Clang Extensions.
14209 //===----------------------------------------------------------------------===//
14210
14211 /// ActOnBlockStart - This callback is invoked when a block literal is started.
14212 void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope) {
14213 BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
14214
14215 if (LangOpts.CPlusPlus) {
14216 MangleNumberingContext *MCtx;
14217 Decl *ManglingContextDecl;
14218 std::tie(MCtx, ManglingContextDecl) =
14219 getCurrentMangleNumberContext(Block->getDeclContext());
14220 if (MCtx) {
14221 unsigned ManglingNumber = MCtx->getManglingNumber(Block);
14222 Block->setBlockMangling(ManglingNumber, ManglingContextDecl);
14223 }
14224 }
14225
14226 PushBlockScope(CurScope, Block);
14227 CurContext->addDecl(Block);
14228 if (CurScope)
14229 PushDeclContext(CurScope, Block);
14230 else
14231 CurContext = Block;
14232
14233 getCurBlock()->HasImplicitReturnType = true;
14234
14235 // Enter a new evaluation context to insulate the block from any
14236 // cleanups from the enclosing full-expression.
14237 PushExpressionEvaluationContext(
14238 ExpressionEvaluationContext::PotentiallyEvaluated);
14239 }
14240
14241 void Sema::ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo,
14242 Scope *CurScope) {
14243 assert(ParamInfo.getIdentifier() == nullptr &&
14244 "block-id should have no identifier!");
14245 assert(ParamInfo.getContext() == DeclaratorContext::BlockLiteralContext);
14246 BlockScopeInfo *CurBlock = getCurBlock();
14247
14248 TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo, CurScope);
14249 QualType T = Sig->getType();
14250
14251 // FIXME: We should allow unexpanded parameter packs here, but that would,
14252 // in turn, make the block expression contain unexpanded parameter packs.
14253 if (DiagnoseUnexpandedParameterPack(CaretLoc, Sig, UPPC_Block)) {
14254 // Drop the parameters.
14255 FunctionProtoType::ExtProtoInfo EPI;
14256 EPI.HasTrailingReturn = false;
14257 EPI.TypeQuals.addConst();
14258 T = Context.getFunctionType(Context.DependentTy, None, EPI);
14259 Sig = Context.getTrivialTypeSourceInfo(T);
14260 }
14261
14262 // GetTypeForDeclarator always produces a function type for a block
14263 // literal signature. Furthermore, it is always a FunctionProtoType
14264 // unless the function was written with a typedef.
14265 assert(T->isFunctionType() &&
14266 "GetTypeForDeclarator made a non-function block signature");
14267
14268 // Look for an explicit signature in that function type.
14269 FunctionProtoTypeLoc ExplicitSignature;
14270
14271 if ((ExplicitSignature = Sig->getTypeLoc()
14272 .getAsAdjusted<FunctionProtoTypeLoc>())) {
14273
14274 // Check whether that explicit signature was synthesized by
14275 // GetTypeForDeclarator. If so, don't save that as part of the
14276 // written signature.
14277 if (ExplicitSignature.getLocalRangeBegin() ==
14278 ExplicitSignature.getLocalRangeEnd()) {
14279 // This would be much cheaper if we stored TypeLocs instead of
14280 // TypeSourceInfos.
14281 TypeLoc Result = ExplicitSignature.getReturnLoc();
14282 unsigned Size = Result.getFullDataSize();
14283 Sig = Context.CreateTypeSourceInfo(Result.getType(), Size);
14284 Sig->getTypeLoc().initializeFullCopy(Result, Size);
14285
14286 ExplicitSignature = FunctionProtoTypeLoc();
14287 }
14288 }
14289
14290 CurBlock->TheDecl->setSignatureAsWritten(Sig);
14291 CurBlock->FunctionType = T;
14292
14293 const FunctionType *Fn = T->getAs<FunctionType>();
14294 QualType RetTy = Fn->getReturnType();
14295 bool isVariadic =
14296 (isa<FunctionProtoType>(Fn) && cast<FunctionProtoType>(Fn)->isVariadic());
14297
14298 CurBlock->TheDecl->setIsVariadic(isVariadic);
14299
14300 // Context.DependentTy is used as a placeholder for a missing block
14301 // return type. TODO: what should we do with declarators like:
14302 // ^ * { ... }
14303 // If the answer is "apply template argument deduction"....
14304 if (RetTy != Context.DependentTy) {
14305 CurBlock->ReturnType = RetTy;
14306 CurBlock->TheDecl->setBlockMissingReturnType(false);
14307 CurBlock->HasImplicitReturnType = false;
14308 }
14309
14310 // Push block parameters from the declarator if we had them.
14311 SmallVector<ParmVarDecl*, 8> Params;
14312 if (ExplicitSignature) {
14313 for (unsigned I = 0, E = ExplicitSignature.getNumParams(); I != E; ++I) {
14314 ParmVarDecl *Param = ExplicitSignature.getParam(I);
14315 if (Param->getIdentifier() == nullptr &&
14316 !Param->isImplicit() &&
14317 !Param->isInvalidDecl() &&
14318 !getLangOpts().CPlusPlus)
14319 Diag(Param->getLocation(), diag::err_parameter_name_omitted);
14320 Params.push_back(Param);
14321 }
14322
14323 // Fake up parameter variables if we have a typedef, like
14324 // ^ fntype { ... }
14325 } else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
14326 for (const auto &I : Fn->param_types()) {
14327 ParmVarDecl *Param = BuildParmVarDeclForTypedef(
14328 CurBlock->TheDecl, ParamInfo.getBeginLoc(), I);
14329 Params.push_back(Param);
14330 }
14331 }
14332
14333 // Set the parameters on the block decl.
14334 if (!Params.empty()) {
14335 CurBlock->TheDecl->setParams(Params);
14336 CheckParmsForFunctionDef(CurBlock->TheDecl->parameters(),
14337 /*CheckParameterNames=*/false);
14338 }
14339
14340 // Finally we can process decl attributes.
14341 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
14342
14343 // Put the parameter variables in scope.
14344 for (auto AI : CurBlock->TheDecl->parameters()) {
14345 AI->setOwningFunction(CurBlock->TheDecl);
14346
14347 // If this has an identifier, add it to the scope stack.
14348 if (AI->getIdentifier()) {
14349 CheckShadow(CurBlock->TheScope, AI);
14350
14351 PushOnScopeChains(AI, CurBlock->TheScope);
14352 }
14353 }
14354 }
14355
14356 /// ActOnBlockError - If there is an error parsing a block, this callback
14357 /// is invoked to pop the information about the block from the action impl.
14358 void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
14359 // Leave the expression-evaluation context.
14360 DiscardCleanupsInEvaluationContext();
14361 PopExpressionEvaluationContext();
14362
14363 // Pop off CurBlock, handle nested blocks.
14364 PopDeclContext();
14365 PopFunctionScopeInfo();
14366 }
14367
14368 /// ActOnBlockStmtExpr - This is called when the body of a block statement
14369 /// literal was successfully completed. ^(int x){...}
14370 ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
14371 Stmt *Body, Scope *CurScope) {
14372 // If blocks are disabled, emit an error.
14373 if (!LangOpts.Blocks)
14374 Diag(CaretLoc, diag::err_blocks_disable) << LangOpts.OpenCL;
14375
14376 // Leave the expression-evaluation context.
14377 if (hasAnyUnrecoverableErrorsInThisFunction())
14378 DiscardCleanupsInEvaluationContext();
14379 assert(!Cleanup.exprNeedsCleanups() &&
14380 "cleanups within block not correctly bound!");
14381 PopExpressionEvaluationContext();
14382
14383 BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
14384 BlockDecl *BD = BSI->TheDecl;
14385
14386 if (BSI->HasImplicitReturnType)
14387 deduceClosureReturnType(*BSI);
14388
14389 QualType RetTy = Context.VoidTy;
14390 if (!BSI->ReturnType.isNull())
14391 RetTy = BSI->ReturnType;
14392
14393 bool NoReturn = BD->hasAttr<NoReturnAttr>();
14394 QualType BlockTy;
14395
14396 // If the user wrote a function type in some form, try to use that.
14397 if (!BSI->FunctionType.isNull()) {
14398 const FunctionType *FTy = BSI->FunctionType->castAs<FunctionType>();
14399
14400 FunctionType::ExtInfo Ext = FTy->getExtInfo();
14401 if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
14402
14403 // Turn protoless block types into nullary block types.
14404 if (isa<FunctionNoProtoType>(FTy)) {
14405 FunctionProtoType::ExtProtoInfo EPI;
14406 EPI.ExtInfo = Ext;
14407 BlockTy = Context.getFunctionType(RetTy, None, EPI);
14408
14409 // Otherwise, if we don't need to change anything about the function type,
14410 // preserve its sugar structure.
14411 } else if (FTy->getReturnType() == RetTy &&
14412 (!NoReturn || FTy->getNoReturnAttr())) {
14413 BlockTy = BSI->FunctionType;
14414
14415 // Otherwise, make the minimal modifications to the function type.
14416 } else {
14417 const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
14418 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
14419 EPI.TypeQuals = Qualifiers();
14420 EPI.ExtInfo = Ext;
14421 BlockTy = Context.getFunctionType(RetTy, FPT->getParamTypes(), EPI);
14422 }
14423
14424 // If we don't have a function type, just build one from nothing.
14425 } else {
14426 FunctionProtoType::ExtProtoInfo EPI;
14427 EPI.ExtInfo = FunctionType::ExtInfo().withNoReturn(NoReturn);
14428 BlockTy = Context.getFunctionType(RetTy, None, EPI);
14429 }
14430
14431 DiagnoseUnusedParameters(BD->parameters());
14432 BlockTy = Context.getBlockPointerType(BlockTy);
14433
14434 // If needed, diagnose invalid gotos and switches in the block.
14435 if (getCurFunction()->NeedsScopeChecking() &&
14436 !PP.isCodeCompletionEnabled())
14437 DiagnoseInvalidJumps(cast<CompoundStmt>(Body));
14438
14439 BD->setBody(cast<CompoundStmt>(Body));
14440
14441 if (Body && getCurFunction()->HasPotentialAvailabilityViolations)
14442 DiagnoseUnguardedAvailabilityViolations(BD);
14443
14444 // Try to apply the named return value optimization. We have to check again
14445 // if we can do this, though, because blocks keep return statements around
14446 // to deduce an implicit return type.
14447 if (getLangOpts().CPlusPlus && RetTy->isRecordType() &&
14448 !BD->isDependentContext())
14449 computeNRVO(Body, BSI);
14450
14451 if (RetTy.hasNonTrivialToPrimitiveDestructCUnion() ||
14452 RetTy.hasNonTrivialToPrimitiveCopyCUnion())
14453 checkNonTrivialCUnion(RetTy, BD->getCaretLocation(), NTCUC_FunctionReturn,
14454 NTCUK_Destruct|NTCUK_Copy);
14455
14456 PopDeclContext();
14457
14458 // Pop the block scope now but keep it alive to the end of this function.
14459 AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
14460 PoppedFunctionScopePtr ScopeRAII = PopFunctionScopeInfo(&WP, BD, BlockTy);
14461
14462 // Set the captured variables on the block.
14463 SmallVector<BlockDecl::Capture, 4> Captures;
14464 for (Capture &Cap : BSI->Captures) {
14465 if (Cap.isInvalid() || Cap.isThisCapture())
14466 continue;
14467
14468 VarDecl *Var = Cap.getVariable();
14469 Expr *CopyExpr = nullptr;
14470 if (getLangOpts().CPlusPlus && Cap.isCopyCapture()) {
14471 if (const RecordType *Record =
14472 Cap.getCaptureType()->getAs<RecordType>()) {
14473 // The capture logic needs the destructor, so make sure we mark it.
14474 // Usually this is unnecessary because most local variables have
14475 // their destructors marked at declaration time, but parameters are
14476 // an exception because it's technically only the call site that
14477 // actually requires the destructor.
14478 if (isa<ParmVarDecl>(Var))
14479 FinalizeVarWithDestructor(Var, Record);
14480
14481 // Enter a separate potentially-evaluated context while building block
14482 // initializers to isolate their cleanups from those of the block
14483 // itself.
14484 // FIXME: Is this appropriate even when the block itself occurs in an
14485 // unevaluated operand?
14486 EnterExpressionEvaluationContext EvalContext(
14487 *this, ExpressionEvaluationContext::PotentiallyEvaluated);
14488
14489 SourceLocation Loc = Cap.getLocation();
14490
14491 ExprResult Result = BuildDeclarationNameExpr(
14492 CXXScopeSpec(), DeclarationNameInfo(Var->getDeclName(), Loc), Var);
14493
14494 // According to the blocks spec, the capture of a variable from
14495 // the stack requires a const copy constructor. This is not true
14496 // of the copy/move done to move a __block variable to the heap.
14497 if (!Result.isInvalid() &&
14498 !Result.get()->getType().isConstQualified()) {
14499 Result = ImpCastExprToType(Result.get(),
14500 Result.get()->getType().withConst(),
14501 CK_NoOp, VK_LValue);
14502 }
14503
14504 if (!Result.isInvalid()) {
14505 Result = PerformCopyInitialization(
14506 InitializedEntity::InitializeBlock(Var->getLocation(),
14507 Cap.getCaptureType(), false),
14508 Loc, Result.get());
14509 }
14510
14511 // Build a full-expression copy expression if initialization
14512 // succeeded and used a non-trivial constructor. Recover from
14513 // errors by pretending that the copy isn't necessary.
14514 if (!Result.isInvalid() &&
14515 !cast<CXXConstructExpr>(Result.get())->getConstructor()
14516 ->isTrivial()) {
14517 Result = MaybeCreateExprWithCleanups(Result);
14518 CopyExpr = Result.get();
14519 }
14520 }
14521 }
14522
14523 BlockDecl::Capture NewCap(Var, Cap.isBlockCapture(), Cap.isNested(),
14524 CopyExpr);
14525 Captures.push_back(NewCap);
14526 }
14527 BD->setCaptures(Context, Captures, BSI->CXXThisCaptureIndex != 0);
14528
14529 BlockExpr *Result = new (Context) BlockExpr(BD, BlockTy);
14530
14531 // If the block isn't obviously global, i.e. it captures anything at
14532 // all, then we need to do a few things in the surrounding context:
14533 if (Result->getBlockDecl()->hasCaptures()) {
14534 // First, this expression has a new cleanup object.
14535 ExprCleanupObjects.push_back(Result->getBlockDecl());
14536 Cleanup.setExprNeedsCleanups(true);
14537
14538 // It also gets a branch-protected scope if any of the captured
14539 // variables needs destruction.
14540 for (const auto &CI : Result->getBlockDecl()->captures()) {
14541 const VarDecl *var = CI.getVariable();
14542 if (var->getType().isDestructedType() != QualType::DK_none) {
14543 setFunctionHasBranchProtectedScope();
14544 break;
14545 }
14546 }
14547 }
14548
14549 if (getCurFunction())
14550 getCurFunction()->addBlock(BD);
14551
14552 return Result;
14553 }
14554
14555 ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty,
14556 SourceLocation RPLoc) {
14557 TypeSourceInfo *TInfo;
14558 GetTypeFromParser(Ty, &TInfo);
14559 return BuildVAArgExpr(BuiltinLoc, E, TInfo, RPLoc);
14560 }
14561
14562 ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
14563 Expr *E, TypeSourceInfo *TInfo,
14564 SourceLocation RPLoc) {
14565 Expr *OrigExpr = E;
14566 bool IsMS = false;
14567
14568 // CUDA device code does not support varargs.
14569 if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice) {
14570 if (const FunctionDecl *F = dyn_cast<FunctionDecl>(CurContext)) {
14571 CUDAFunctionTarget T = IdentifyCUDATarget(F);
14572 if (T == CFT_Global || T == CFT_Device || T == CFT_HostDevice)
14573 return ExprError(Diag(E->getBeginLoc(), diag::err_va_arg_in_device));
14574 }
14575 }
14576
14577 // NVPTX does not support va_arg expression.
14578 if (getLangOpts().OpenMP && getLangOpts().OpenMPIsDevice &&
14579 Context.getTargetInfo().getTriple().isNVPTX())
14580 targetDiag(E->getBeginLoc(), diag::err_va_arg_in_device);
14581
14582 // It might be a __builtin_ms_va_list. (But don't ever mark a va_arg()
14583 // as Microsoft ABI on an actual Microsoft platform, where
14584 // __builtin_ms_va_list and __builtin_va_list are the same.)
14585 if (!E->isTypeDependent() && Context.getTargetInfo().hasBuiltinMSVaList() &&
14586 Context.getTargetInfo().getBuiltinVaListKind() != TargetInfo::CharPtrBuiltinVaList) {
14587 QualType MSVaListType = Context.getBuiltinMSVaListType();
14588 if (Context.hasSameType(MSVaListType, E->getType())) {
14589 if (CheckForModifiableLvalue(E, BuiltinLoc, *this))
14590 return ExprError();
14591 IsMS = true;
14592 }
14593 }
14594
14595 // Get the va_list type
14596 QualType VaListType = Context.getBuiltinVaListType();
14597 if (!IsMS) {
14598 if (VaListType->isArrayType()) {
14599 // Deal with implicit array decay; for example, on x86-64,
14600 // va_list is an array, but it's supposed to decay to
14601 // a pointer for va_arg.
14602 VaListType = Context.getArrayDecayedType(VaListType);
14603 // Make sure the input expression also decays appropriately.
14604 ExprResult Result = UsualUnaryConversions(E);
14605 if (Result.isInvalid())
14606 return ExprError();
14607 E = Result.get();
14608 } else if (VaListType->isRecordType() && getLangOpts().CPlusPlus) {
14609 // If va_list is a record type and we are compiling in C++ mode,
14610 // check the argument using reference binding.
14611 InitializedEntity Entity = InitializedEntity::InitializeParameter(
14612 Context, Context.getLValueReferenceType(VaListType), false);
14613 ExprResult Init = PerformCopyInitialization(Entity, SourceLocation(), E);
14614 if (Init.isInvalid())
14615 return ExprError();
14616 E = Init.getAs<Expr>();
14617 } else {
14618 // Otherwise, the va_list argument must be an l-value because
14619 // it is modified by va_arg.
14620 if (!E->isTypeDependent() &&
14621 CheckForModifiableLvalue(E, BuiltinLoc, *this))
14622 return ExprError();
14623 }
14624 }
14625
14626 if (!IsMS && !E->isTypeDependent() &&
14627 !Context.hasSameType(VaListType, E->getType()))
14628 return ExprError(
14629 Diag(E->getBeginLoc(),
14630 diag::err_first_argument_to_va_arg_not_of_type_va_list)
14631 << OrigExpr->getType() << E->getSourceRange());
14632
14633 if (!TInfo->getType()->isDependentType()) {
14634 if (RequireCompleteType(TInfo->getTypeLoc().getBeginLoc(), TInfo->getType(),
14635 diag::err_second_parameter_to_va_arg_incomplete,
14636 TInfo->getTypeLoc()))
14637 return ExprError();
14638
14639 if (RequireNonAbstractType(TInfo->getTypeLoc().getBeginLoc(),
14640 TInfo->getType(),
14641 diag::err_second_parameter_to_va_arg_abstract,
14642 TInfo->getTypeLoc()))
14643 return ExprError();
14644
14645 if (!TInfo->getType().isPODType(Context)) {
14646 Diag(TInfo->getTypeLoc().getBeginLoc(),
14647 TInfo->getType()->isObjCLifetimeType()
14648 ? diag::warn_second_parameter_to_va_arg_ownership_qualified
14649 : diag::warn_second_parameter_to_va_arg_not_pod)
14650 << TInfo->getType()
14651 << TInfo->getTypeLoc().getSourceRange();
14652 }
14653
14654 // Check for va_arg where arguments of the given type will be promoted
14655 // (i.e. this va_arg is guaranteed to have undefined behavior).
14656 QualType PromoteType;
14657 if (TInfo->getType()->isPromotableIntegerType()) {
14658 PromoteType = Context.getPromotedIntegerType(TInfo->getType());
14659 if (Context.typesAreCompatible(PromoteType, TInfo->getType()))
14660 PromoteType = QualType();
14661 }
14662 if (TInfo->getType()->isSpecificBuiltinType(BuiltinType::Float))
14663 PromoteType = Context.DoubleTy;
14664 if (!PromoteType.isNull())
14665 DiagRuntimeBehavior(TInfo->getTypeLoc().getBeginLoc(), E,
14666 PDiag(diag::warn_second_parameter_to_va_arg_never_compatible)
14667 << TInfo->getType()
14668 << PromoteType
14669 << TInfo->getTypeLoc().getSourceRange());
14670 }
14671
14672 QualType T = TInfo->getType().getNonLValueExprType(Context);
14673 return new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T, IsMS);
14674 }
14675
14676 ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
14677 // The type of __null will be int or long, depending on the size of
14678 // pointers on the target.
14679 QualType Ty;
14680 unsigned pw = Context.getTargetInfo().getPointerWidth(0);
14681 if (pw == Context.getTargetInfo().getIntWidth())
14682 Ty = Context.IntTy;
14683 else if (pw == Context.getTargetInfo().getLongWidth())
14684 Ty = Context.LongTy;
14685 else if (pw == Context.getTargetInfo().getLongLongWidth())
14686 Ty = Context.LongLongTy;
14687 else {
14688 llvm_unreachable("I don't know size of pointer!");
14689 }
14690
14691 return new (Context) GNUNullExpr(Ty, TokenLoc);
14692 }
14693
14694 ExprResult Sema::ActOnSourceLocExpr(SourceLocExpr::IdentKind Kind,
14695 SourceLocation BuiltinLoc,
14696 SourceLocation RPLoc) {
14697 return BuildSourceLocExpr(Kind, BuiltinLoc, RPLoc, CurContext);
14698 }
14699
14700 ExprResult Sema::BuildSourceLocExpr(SourceLocExpr::IdentKind Kind,
14701 SourceLocation BuiltinLoc,
14702 SourceLocation RPLoc,
14703 DeclContext *ParentContext) {
14704 return new (Context)
14705 SourceLocExpr(Context, Kind, BuiltinLoc, RPLoc, ParentContext);
14706 }
14707
14708 bool Sema::ConversionToObjCStringLiteralCheck(QualType DstType, Expr *&Exp,
14709 bool Diagnose) {
14710 if (!getLangOpts().ObjC)
14711 return false;
14712
14713 const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
14714 if (!PT)
14715 return false;
14716
14717 if (!PT->isObjCIdType()) {
14718 // Check if the destination is the 'NSString' interface.
14719 const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
14720 if (!ID || !ID->getIdentifier()->isStr("NSString"))
14721 return false;
14722 }
14723
14724 // Ignore any parens, implicit casts (should only be
14725 // array-to-pointer decays), and not-so-opaque values. The last is
14726 // important for making this trigger for property assignments.
14727 Expr *SrcExpr = Exp->IgnoreParenImpCasts();
14728 if (OpaqueValueExpr *OV = dyn_cast<OpaqueValueExpr>(SrcExpr))
14729 if (OV->getSourceExpr())
14730 SrcExpr = OV->getSourceExpr()->IgnoreParenImpCasts();
14731
14732 StringLiteral *SL = dyn_cast<StringLiteral>(SrcExpr);
14733 if (!SL || !SL->isAscii())
14734 return false;
14735 if (Diagnose) {
14736 Diag(SL->getBeginLoc(), diag::err_missing_atsign_prefix)
14737 << FixItHint::CreateInsertion(SL->getBeginLoc(), "@");
14738 Exp = BuildObjCStringLiteral(SL->getBeginLoc(), SL).get();
14739 }
14740 return true;
14741 }
14742
14743 static bool maybeDiagnoseAssignmentToFunction(Sema &S, QualType DstType,
14744 const Expr *SrcExpr) {
14745 if (!DstType->isFunctionPointerType() ||
14746 !SrcExpr->getType()->isFunctionType())
14747 return false;
14748
14749 auto *DRE = dyn_cast<DeclRefExpr>(SrcExpr->IgnoreParenImpCasts());
14750 if (!DRE)
14751 return false;
14752
14753 auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl());
14754 if (!FD)
14755 return false;
14756
14757 return !S.checkAddressOfFunctionIsAvailable(FD,
14758 /*Complain=*/true,
14759 SrcExpr->getBeginLoc());
14760 }
14761
14762 bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
14763 SourceLocation Loc,
14764 QualType DstType, QualType SrcType,
14765 Expr *SrcExpr, AssignmentAction Action,
14766 bool *Complained) {
14767 if (Complained)
14768 *Complained = false;
14769
14770 // Decode the result (notice that AST's are still created for extensions).
14771 bool CheckInferredResultType = false;
14772 bool isInvalid = false;
14773 unsigned DiagKind = 0;
14774 FixItHint Hint;
14775 ConversionFixItGenerator ConvHints;
14776 bool MayHaveConvFixit = false;
14777 bool MayHaveFunctionDiff = false;
14778 const ObjCInterfaceDecl *IFace = nullptr;
14779 const ObjCProtocolDecl *PDecl = nullptr;
14780
14781 switch (ConvTy) {
14782 case Compatible:
14783 DiagnoseAssignmentEnum(DstType, SrcType, SrcExpr);
14784 return false;
14785
14786 case PointerToInt:
14787 DiagKind = diag::ext_typecheck_convert_pointer_int;
14788 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
14789 MayHaveConvFixit = true;
14790 break;
14791 case IntToPointer:
14792 DiagKind = diag::ext_typecheck_convert_int_pointer;
14793 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
14794 MayHaveConvFixit = true;
14795 break;
14796 case IncompatiblePointer:
14797 if (Action == AA_Passing_CFAudited)
14798 DiagKind = diag::err_arc_typecheck_convert_incompatible_pointer;
14799 else if (SrcType->isFunctionPointerType() &&
14800 DstType->isFunctionPointerType())
14801 DiagKind = diag::ext_typecheck_convert_incompatible_function_pointer;
14802 else
14803 DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
14804
14805 CheckInferredResultType = DstType->isObjCObjectPointerType() &&
14806 SrcType->isObjCObjectPointerType();
14807 if (Hint.isNull() && !CheckInferredResultType) {
14808 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
14809 }
14810 else if (CheckInferredResultType) {
14811 SrcType = SrcType.getUnqualifiedType();
14812 DstType = DstType.getUnqualifiedType();
14813 }
14814 MayHaveConvFixit = true;
14815 break;
14816 case IncompatiblePointerSign:
14817 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
14818 break;
14819 case FunctionVoidPointer:
14820 DiagKind = diag::ext_typecheck_convert_pointer_void_func;
14821 break;
14822 case IncompatiblePointerDiscardsQualifiers: {
14823 // Perform array-to-pointer decay if necessary.
14824 if (SrcType->isArrayType()) SrcType = Context.getArrayDecayedType(SrcType);
14825
14826 Qualifiers lhq = SrcType->getPointeeType().getQualifiers();
14827 Qualifiers rhq = DstType->getPointeeType().getQualifiers();
14828 if (lhq.getAddressSpace() != rhq.getAddressSpace()) {
14829 DiagKind = diag::err_typecheck_incompatible_address_space;
14830 break;
14831
14832 } else if (lhq.getObjCLifetime() != rhq.getObjCLifetime()) {
14833 DiagKind = diag::err_typecheck_incompatible_ownership;
14834 break;
14835 }
14836
14837 llvm_unreachable("unknown error case for discarding qualifiers!");
14838 // fallthrough
14839 }
14840 case CompatiblePointerDiscardsQualifiers:
14841 // If the qualifiers lost were because we were applying the
14842 // (deprecated) C++ conversion from a string literal to a char*
14843 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME:
14844 // Ideally, this check would be performed in
14845 // checkPointerTypesForAssignment. However, that would require a
14846 // bit of refactoring (so that the second argument is an
14847 // expression, rather than a type), which should be done as part
14848 // of a larger effort to fix checkPointerTypesForAssignment for
14849 // C++ semantics.
14850 if (getLangOpts().CPlusPlus &&
14851 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
14852 return false;
14853 DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
14854 break;
14855 case IncompatibleNestedPointerQualifiers:
14856 DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
14857 break;
14858 case IncompatibleNestedPointerAddressSpaceMismatch:
14859 DiagKind = diag::err_typecheck_incompatible_nested_address_space;
14860 break;
14861 case IntToBlockPointer:
14862 DiagKind = diag::err_int_to_block_pointer;
14863 break;
14864 case IncompatibleBlockPointer:
14865 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
14866 break;
14867 case IncompatibleObjCQualifiedId: {
14868 if (SrcType->isObjCQualifiedIdType()) {
14869 const ObjCObjectPointerType *srcOPT =
14870 SrcType->castAs<ObjCObjectPointerType>();
14871 for (auto *srcProto : srcOPT->quals()) {
14872 PDecl = srcProto;
14873 break;
14874 }
14875 if (const ObjCInterfaceType *IFaceT =
14876 DstType->castAs<ObjCObjectPointerType>()->getInterfaceType())
14877 IFace = IFaceT->getDecl();
14878 }
14879 else if (DstType->isObjCQualifiedIdType()) {
14880 const ObjCObjectPointerType *dstOPT =
14881 DstType->castAs<ObjCObjectPointerType>();
14882 for (auto *dstProto : dstOPT->quals()) {
14883 PDecl = dstProto;
14884 break;
14885 }
14886 if (const ObjCInterfaceType *IFaceT =
14887 SrcType->castAs<ObjCObjectPointerType>()->getInterfaceType())
14888 IFace = IFaceT->getDecl();
14889 }
14890 DiagKind = diag::warn_incompatible_qualified_id;
14891 break;
14892 }
14893 case IncompatibleVectors:
14894 DiagKind = diag::warn_incompatible_vectors;
14895 break;
14896 case IncompatibleObjCWeakRef:
14897 DiagKind = diag::err_arc_weak_unavailable_assign;
14898 break;
14899 case Incompatible:
14900 if (maybeDiagnoseAssignmentToFunction(*this, DstType, SrcExpr)) {
14901 if (Complained)
14902 *Complained = true;
14903 return true;
14904 }
14905
14906 DiagKind = diag::err_typecheck_convert_incompatible;
14907 ConvHints.tryToFixConversion(SrcExpr, SrcType, DstType, *this);
14908 MayHaveConvFixit = true;
14909 isInvalid = true;
14910 MayHaveFunctionDiff = true;
14911 break;
14912 }
14913
14914 QualType FirstType, SecondType;
14915 switch (Action) {
14916 case AA_Assigning:
14917 case AA_Initializing:
14918 // The destination type comes first.
14919 FirstType = DstType;
14920 SecondType = SrcType;
14921 break;
14922
14923 case AA_Returning:
14924 case AA_Passing:
14925 case AA_Passing_CFAudited:
14926 case AA_Converting:
14927 case AA_Sending:
14928 case AA_Casting:
14929 // The source type comes first.
14930 FirstType = SrcType;
14931 SecondType = DstType;
14932 break;
14933 }
14934
14935 PartialDiagnostic FDiag = PDiag(DiagKind);
14936 if (Action == AA_Passing_CFAudited)
14937 FDiag << FirstType << SecondType << AA_Passing << SrcExpr->getSourceRange();
14938 else
14939 FDiag << FirstType << SecondType << Action << SrcExpr->getSourceRange();
14940
14941 // If we can fix the conversion, suggest the FixIts.
14942 assert(ConvHints.isNull() || Hint.isNull());
14943 if (!ConvHints.isNull()) {
14944 for (FixItHint &H : ConvHints.Hints)
14945 FDiag << H;
14946 } else {
14947 FDiag << Hint;
14948 }
14949 if (MayHaveConvFixit) { FDiag << (unsigned) (ConvHints.Kind); }
14950
14951 if (MayHaveFunctionDiff)
14952 HandleFunctionTypeMismatch(FDiag, SecondType, FirstType);
14953
14954 Diag(Loc, FDiag);
14955 if (DiagKind == diag::warn_incompatible_qualified_id &&
14956 PDecl && IFace && !IFace->hasDefinition())
14957 Diag(IFace->getLocation(), diag::note_incomplete_class_and_qualified_id)
14958 << IFace << PDecl;
14959
14960 if (SecondType == Context.OverloadTy)
14961 NoteAllOverloadCandidates(OverloadExpr::find(SrcExpr).Expression,
14962 FirstType, /*TakingAddress=*/true);
14963
14964 if (CheckInferredResultType)
14965 EmitRelatedResultTypeNote(SrcExpr);
14966
14967 if (Action == AA_Returning && ConvTy == IncompatiblePointer)
14968 EmitRelatedResultTypeNoteForReturn(DstType);
14969
14970 if (Complained)
14971 *Complained = true;
14972 return isInvalid;
14973 }
14974
14975 ExprResult Sema::VerifyIntegerConstantExpression(Expr *E,
14976 llvm::APSInt *Result) {
14977 class SimpleICEDiagnoser : public VerifyICEDiagnoser {
14978 public:
14979 void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override {
14980 S.Diag(Loc, diag::err_expr_not_ice) << S.LangOpts.CPlusPlus << SR;
14981 }
14982 } Diagnoser;
14983
14984 return VerifyIntegerConstantExpression(E, Result, Diagnoser);
14985 }
14986
14987 ExprResult Sema::VerifyIntegerConstantExpression(Expr *E,
14988 llvm::APSInt *Result,
14989 unsigned DiagID,
14990 bool AllowFold) {
14991 class IDDiagnoser : public VerifyICEDiagnoser {
14992 unsigned DiagID;
14993
14994 public:
14995 IDDiagnoser(unsigned DiagID)
14996 : VerifyICEDiagnoser(DiagID == 0), DiagID(DiagID) { }
14997
14998 void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override {
14999 S.Diag(Loc, DiagID) << SR;
15000 }
15001 } Diagnoser(DiagID);
15002
15003 return VerifyIntegerConstantExpression(E, Result, Diagnoser, AllowFold);
15004 }
15005
15006 void Sema::VerifyICEDiagnoser::diagnoseFold(Sema &S, SourceLocation Loc,
15007 SourceRange SR) {
15008 S.Diag(Loc, diag::ext_expr_not_ice) << SR << S.LangOpts.CPlusPlus;
15009 }
15010
15011 ExprResult
15012 Sema::VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result,
15013 VerifyICEDiagnoser &Diagnoser,
15014 bool AllowFold) {
15015 SourceLocation DiagLoc = E->getBeginLoc();
15016
15017 if (getLangOpts().CPlusPlus11) {
15018 // C++11 [expr.const]p5:
15019 // If an expression of literal class type is used in a context where an
15020 // integral constant expression is required, then that class type shall
15021 // have a single non-explicit conversion function to an integral or
15022 // unscoped enumeration type
15023 ExprResult Converted;
15024 class CXX11ConvertDiagnoser : public ICEConvertDiagnoser {
15025 public:
15026 CXX11ConvertDiagnoser(bool Silent)
15027 : ICEConvertDiagnoser(/*AllowScopedEnumerations*/false,
15028 Silent, true) {}
15029
15030 SemaDiagnosticBuilder diagnoseNotInt(Sema &S, SourceLocation Loc,
15031 QualType T) override {
15032 return S.Diag(Loc, diag::err_ice_not_integral) << T;
15033 }
15034
15035 SemaDiagnosticBuilder diagnoseIncomplete(
15036 Sema &S, SourceLocation Loc, QualType T) override {
15037 return S.Diag(Loc, diag::err_ice_incomplete_type) << T;
15038 }
15039
15040 SemaDiagnosticBuilder diagnoseExplicitConv(
15041 Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) override {
15042 return S.Diag(Loc, diag::err_ice_explicit_conversion) << T << ConvTy;
15043 }
15044
15045 SemaDiagnosticBuilder noteExplicitConv(
15046 Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
15047 return S.Diag(Conv->getLocation(), diag::note_ice_conversion_here)
15048 << ConvTy->isEnumeralType() << ConvTy;
15049 }
15050
15051 SemaDiagnosticBuilder diagnoseAmbiguous(
15052 Sema &S, SourceLocation Loc, QualType T) override {
15053 return S.Diag(Loc, diag::err_ice_ambiguous_conversion) << T;
15054 }
15055
15056 SemaDiagnosticBuilder noteAmbiguous(
15057 Sema &S, CXXConversionDecl *Conv, QualType ConvTy) override {
15058 return S.Diag(Conv->getLocation(), diag::note_ice_conversion_here)
15059 << ConvTy->isEnumeralType() << ConvTy;
15060 }
15061
15062 SemaDiagnosticBuilder diagnoseConversion(
15063 Sema &S, SourceLocation Loc, QualType T, QualType ConvTy) override {
15064 llvm_unreachable("conversion functions are permitted");
15065 }
15066 } ConvertDiagnoser(Diagnoser.Suppress);
15067
15068 Converted = PerformContextualImplicitConversion(DiagLoc, E,
15069 ConvertDiagnoser);
15070 if (Converted.isInvalid())
15071 return Converted;
15072 E = Converted.get();
15073 if (!E->getType()->isIntegralOrUnscopedEnumerationType())
15074 return ExprError();
15075 } else if (!E->getType()->isIntegralOrUnscopedEnumerationType()) {
15076 // An ICE must be of integral or unscoped enumeration type.
15077 if (!Diagnoser.Suppress)
15078 Diagnoser.diagnoseNotICE(*this, DiagLoc, E->getSourceRange());
15079 return ExprError();
15080 }
15081
15082 // Circumvent ICE checking in C++11 to avoid evaluating the expression twice
15083 // in the non-ICE case.
15084 if (!getLangOpts().CPlusPlus11 && E->isIntegerConstantExpr(Context)) {
15085 if (Result)
15086 *Result = E->EvaluateKnownConstIntCheckOverflow(Context);
15087 if (!isa<ConstantExpr>(E))
15088 E = ConstantExpr::Create(Context, E);
15089 return E;
15090 }
15091
15092 Expr::EvalResult EvalResult;
15093 SmallVector<PartialDiagnosticAt, 8> Notes;
15094 EvalResult.Diag = &Notes;
15095
15096 // Try to evaluate the expression, and produce diagnostics explaining why it's
15097 // not a constant expression as a side-effect.
15098 bool Folded =
15099 E->EvaluateAsRValue(EvalResult, Context, /*isConstantContext*/ true) &&
15100 EvalResult.Val.isInt() && !EvalResult.HasSideEffects;
15101
15102 if (!isa<ConstantExpr>(E))
15103 E = ConstantExpr::Create(Context, E, EvalResult.Val);
15104
15105 // In C++11, we can rely on diagnostics being produced for any expression
15106 // which is not a constant expression. If no diagnostics were produced, then
15107 // this is a constant expression.
15108 if (Folded && getLangOpts().CPlusPlus11 && Notes.empty()) {
15109 if (Result)
15110 *Result = EvalResult.Val.getInt();
15111 return E;
15112 }
15113
15114 // If our only note is the usual "invalid subexpression" note, just point
15115 // the caret at its location rather than producing an essentially
15116 // redundant note.
15117 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
15118 diag::note_invalid_subexpr_in_const_expr) {
15119 DiagLoc = Notes[0].first;
15120 Notes.clear();
15121 }
15122
15123 if (!Folded || !AllowFold) {
15124 if (!Diagnoser.Suppress) {
15125 Diagnoser.diagnoseNotICE(*this, DiagLoc, E->getSourceRange());
15126 for (const PartialDiagnosticAt &Note : Notes)
15127 Diag(Note.first, Note.second);
15128 }
15129
15130 return ExprError();
15131 }
15132
15133 Diagnoser.diagnoseFold(*this, DiagLoc, E->getSourceRange());
15134 for (const PartialDiagnosticAt &Note : Notes)
15135 Diag(Note.first, Note.second);
15136
15137 if (Result)
15138 *Result = EvalResult.Val.getInt();
15139 return E;
15140 }
15141
15142 namespace {
15143 // Handle the case where we conclude a expression which we speculatively
15144 // considered to be unevaluated is actually evaluated.
15145 class TransformToPE : public TreeTransform<TransformToPE> {
15146 typedef TreeTransform<TransformToPE> BaseTransform;
15147
15148 public:
15149 TransformToPE(Sema &SemaRef) : BaseTransform(SemaRef) { }
15150
15151 // Make sure we redo semantic analysis
15152 bool AlwaysRebuild() { return true; }
15153 bool ReplacingOriginal() { return true; }
15154
15155 // We need to special-case DeclRefExprs referring to FieldDecls which
15156 // are not part of a member pointer formation; normal TreeTransforming
15157 // doesn't catch this case because of the way we represent them in the AST.
15158 // FIXME: This is a bit ugly; is it really the best way to handle this
15159 // case?
15160 //
15161 // Error on DeclRefExprs referring to FieldDecls.
15162 ExprResult TransformDeclRefExpr(DeclRefExpr *E) {
15163 if (isa<FieldDecl>(E->getDecl()) &&
15164 !SemaRef.isUnevaluatedContext())
15165 return SemaRef.Diag(E->getLocation(),
15166 diag::err_invalid_non_static_member_use)
15167 << E->getDecl() << E->getSourceRange();
15168
15169 return BaseTransform::TransformDeclRefExpr(E);
15170 }
15171
15172 // Exception: filter out member pointer formation
15173 ExprResult TransformUnaryOperator(UnaryOperator *E) {
15174 if (E->getOpcode() == UO_AddrOf && E->getType()->isMemberPointerType())
15175 return E;
15176
15177 return BaseTransform::TransformUnaryOperator(E);
15178 }
15179
15180 // The body of a lambda-expression is in a separate expression evaluation
15181 // context so never needs to be transformed.
15182 // FIXME: Ideally we wouldn't transform the closure type either, and would
15183 // just recreate the capture expressions and lambda expression.
15184 StmtResult TransformLambdaBody(LambdaExpr *E, Stmt *Body) {
15185 return SkipLambdaBody(E, Body);
15186 }
15187 };
15188 }
15189
15190 ExprResult Sema::TransformToPotentiallyEvaluated(Expr *E) {
15191 assert(isUnevaluatedContext() &&
15192 "Should only transform unevaluated expressions");
15193 ExprEvalContexts.back().Context =
15194 ExprEvalContexts[ExprEvalContexts.size()-2].Context;
15195 if (isUnevaluatedContext())
15196 return E;
15197 return TransformToPE(*this).TransformExpr(E);
15198 }
15199
15200 void
15201 Sema::PushExpressionEvaluationContext(
15202 ExpressionEvaluationContext NewContext, Decl *LambdaContextDecl,
15203 ExpressionEvaluationContextRecord::ExpressionKind ExprContext) {
15204 ExprEvalContexts.emplace_back(NewContext, ExprCleanupObjects.size(), Cleanup,
15205 LambdaContextDecl, ExprContext);
15206 Cleanup.reset();
15207 if (!MaybeODRUseExprs.empty())
15208 std::swap(MaybeODRUseExprs, ExprEvalContexts.back().SavedMaybeODRUseExprs);
15209 }
15210
15211 void
15212 Sema::PushExpressionEvaluationContext(
15213 ExpressionEvaluationContext NewContext, ReuseLambdaContextDecl_t,
15214 ExpressionEvaluationContextRecord::ExpressionKind ExprContext) {
15215 Decl *ClosureContextDecl = ExprEvalContexts.back().ManglingContextDecl;
15216 PushExpressionEvaluationContext(NewContext, ClosureContextDecl, ExprContext);
15217 }
15218
15219 namespace {
15220
15221 const DeclRefExpr *CheckPossibleDeref(Sema &S, const Expr *PossibleDeref) {
15222 PossibleDeref = PossibleDeref->IgnoreParenImpCasts();
15223 if (const auto *E = dyn_cast<UnaryOperator>(PossibleDeref)) {
15224 if (E->getOpcode() == UO_Deref)
15225 return CheckPossibleDeref(S, E->getSubExpr());
15226 } else if (const auto *E = dyn_cast<ArraySubscriptExpr>(PossibleDeref)) {
15227 return CheckPossibleDeref(S, E->getBase());
15228 } else if (const auto *E = dyn_cast<MemberExpr>(PossibleDeref)) {
15229 return CheckPossibleDeref(S, E->getBase());
15230 } else if (const auto E = dyn_cast<DeclRefExpr>(PossibleDeref)) {
15231 QualType Inner;
15232 QualType Ty = E->getType();
15233 if (const auto *Ptr = Ty->getAs<PointerType>())
15234 Inner = Ptr->getPointeeType();
15235 else if (const auto *Arr = S.Context.getAsArrayType(Ty))
15236 Inner = Arr->getElementType();
15237 else
15238 return nullptr;
15239
15240 if (Inner->hasAttr(attr::NoDeref))
15241 return E;
15242 }
15243 return nullptr;
15244 }
15245
15246 } // namespace
15247
15248 void Sema::WarnOnPendingNoDerefs(ExpressionEvaluationContextRecord &Rec) {
15249 for (const Expr *E : Rec.PossibleDerefs) {
15250 const DeclRefExpr *DeclRef = CheckPossibleDeref(*this, E);
15251 if (DeclRef) {
15252 const ValueDecl *Decl = DeclRef->getDecl();
15253 Diag(E->getExprLoc(), diag::warn_dereference_of_noderef_type)
15254 << Decl->getName() << E->getSourceRange();
15255 Diag(Decl->getLocation(), diag::note_previous_decl) << Decl->getName();
15256 } else {
15257 Diag(E->getExprLoc(), diag::warn_dereference_of_noderef_type_no_decl)
15258 << E->getSourceRange();
15259 }
15260 }
15261 Rec.PossibleDerefs.clear();
15262 }
15263
15264 /// Check whether E, which is either a discarded-value expression or an
15265 /// unevaluated operand, is a simple-assignment to a volatlie-qualified lvalue,
15266 /// and if so, remove it from the list of volatile-qualified assignments that
15267 /// we are going to warn are deprecated.
15268 void Sema::CheckUnusedVolatileAssignment(Expr *E) {
15269 if (!E->getType().isVolatileQualified() || !getLangOpts().CPlusPlus2a)
15270 return;
15271
15272 // Note: ignoring parens here is not justified by the standard rules, but
15273 // ignoring parentheses seems like a more reasonable approach, and this only
15274 // drives a deprecation warning so doesn't affect conformance.
15275 if (auto *BO = dyn_cast<BinaryOperator>(E->IgnoreParenImpCasts())) {
15276 if (BO->getOpcode() == BO_Assign) {
15277 auto &LHSs = ExprEvalContexts.back().VolatileAssignmentLHSs;
15278 LHSs.erase(std::remove(LHSs.begin(), LHSs.end(), BO->getLHS()),
15279 LHSs.end());
15280 }
15281 }
15282 }
15283
15284 void Sema::PopExpressionEvaluationContext() {
15285 ExpressionEvaluationContextRecord& Rec = ExprEvalContexts.back();
15286 unsigned NumTypos = Rec.NumTypos;
15287
15288 if (!Rec.Lambdas.empty()) {
15289 using ExpressionKind = ExpressionEvaluationContextRecord::ExpressionKind;
15290 if (Rec.ExprContext == ExpressionKind::EK_TemplateArgument || Rec.isUnevaluated() ||
15291 (Rec.isConstantEvaluated() && !getLangOpts().CPlusPlus17)) {
15292 unsigned D;
15293 if (Rec.isUnevaluated()) {
15294 // C++11 [expr.prim.lambda]p2:
15295 // A lambda-expression shall not appear in an unevaluated operand
15296 // (Clause 5).
15297 D = diag::err_lambda_unevaluated_operand;
15298 } else if (Rec.isConstantEvaluated() && !getLangOpts().CPlusPlus17) {
15299 // C++1y [expr.const]p2:
15300 // A conditional-expression e is a core constant expression unless the
15301 // evaluation of e, following the rules of the abstract machine, would
15302 // evaluate [...] a lambda-expression.
15303 D = diag::err_lambda_in_constant_expression;
15304 } else if (Rec.ExprContext == ExpressionKind::EK_TemplateArgument) {
15305 // C++17 [expr.prim.lamda]p2:
15306 // A lambda-expression shall not appear [...] in a template-argument.
15307 D = diag::err_lambda_in_invalid_context;
15308 } else
15309 llvm_unreachable("Couldn't infer lambda error message.");
15310
15311 for (const auto *L : Rec.Lambdas)
15312 Diag(L->getBeginLoc(), D);
15313 }
15314 }
15315
15316 WarnOnPendingNoDerefs(Rec);
15317
15318 // Warn on any volatile-qualified simple-assignments that are not discarded-
15319 // value expressions nor unevaluated operands (those cases get removed from
15320 // this list by CheckUnusedVolatileAssignment).
15321 for (auto *BO : Rec.VolatileAssignmentLHSs)
15322 Diag(BO->getBeginLoc(), diag::warn_deprecated_simple_assign_volatile)
15323 << BO->getType();
15324
15325 // When are coming out of an unevaluated context, clear out any
15326 // temporaries that we may have created as part of the evaluation of
15327 // the expression in that context: they aren't relevant because they
15328 // will never be constructed.
15329 if (Rec.isUnevaluated() || Rec.isConstantEvaluated()) {
15330 ExprCleanupObjects.erase(ExprCleanupObjects.begin() + Rec.NumCleanupObjects,
15331 ExprCleanupObjects.end());
15332 Cleanup = Rec.ParentCleanup;
15333 CleanupVarDeclMarking();
15334 std::swap(MaybeODRUseExprs, Rec.SavedMaybeODRUseExprs);
15335 // Otherwise, merge the contexts together.
15336 } else {
15337 Cleanup.mergeFrom(Rec.ParentCleanup);
15338 MaybeODRUseExprs.insert(Rec.SavedMaybeODRUseExprs.begin(),
15339 Rec.SavedMaybeODRUseExprs.end());
15340 }
15341
15342 // Pop the current expression evaluation context off the stack.
15343 ExprEvalContexts.pop_back();
15344
15345 // The global expression evaluation context record is never popped.
15346 ExprEvalContexts.back().NumTypos += NumTypos;
15347 }
15348
15349 void Sema::DiscardCleanupsInEvaluationContext() {
15350 ExprCleanupObjects.erase(
15351 ExprCleanupObjects.begin() + ExprEvalContexts.back().NumCleanupObjects,
15352 ExprCleanupObjects.end());
15353 Cleanup.reset();
15354 MaybeODRUseExprs.clear();
15355 }
15356
15357 ExprResult Sema::HandleExprEvaluationContextForTypeof(Expr *E) {
15358 ExprResult Result = CheckPlaceholderExpr(E);
15359 if (Result.isInvalid())
15360 return ExprError();
15361 E = Result.get();
15362 if (!E->getType()->isVariablyModifiedType())
15363 return E;
15364 return TransformToPotentiallyEvaluated(E);
15365 }
15366
15367 /// Are we in a context that is potentially constant evaluated per C++20
15368 /// [expr.const]p12?
15369 static bool isPotentiallyConstantEvaluatedContext(Sema &SemaRef) {
15370 /// C++2a [expr.const]p12:
15371 // An expression or conversion is potentially constant evaluated if it is
15372 switch (SemaRef.ExprEvalContexts.back().Context) {
15373 case Sema::ExpressionEvaluationContext::ConstantEvaluated:
15374 // -- a manifestly constant-evaluated expression,
15375 case Sema::ExpressionEvaluationContext::PotentiallyEvaluated:
15376 case Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
15377 case Sema::ExpressionEvaluationContext::DiscardedStatement:
15378 // -- a potentially-evaluated expression,
15379 case Sema::ExpressionEvaluationContext::UnevaluatedList:
15380 // -- an immediate subexpression of a braced-init-list,
15381
15382 // -- [FIXME] an expression of the form & cast-expression that occurs
15383 // within a templated entity
15384 // -- a subexpression of one of the above that is not a subexpression of
15385 // a nested unevaluated operand.
15386 return true;
15387
15388 case Sema::ExpressionEvaluationContext::Unevaluated:
15389 case Sema::ExpressionEvaluationContext::UnevaluatedAbstract:
15390 // Expressions in this context are never evaluated.
15391 return false;
15392 }
15393 llvm_unreachable("Invalid context");
15394 }
15395
15396 /// Return true if this function has a calling convention that requires mangling
15397 /// in the size of the parameter pack.
15398 static bool funcHasParameterSizeMangling(Sema &S, FunctionDecl *FD) {
15399 // These manglings don't do anything on non-Windows or non-x86 platforms, so
15400 // we don't need parameter type sizes.
15401 const llvm::Triple &TT = S.Context.getTargetInfo().getTriple();
15402 if (!TT.isOSWindows() || !TT.isX86())
15403 return false;
15404
15405 // If this is C++ and this isn't an extern "C" function, parameters do not
15406 // need to be complete. In this case, C++ mangling will apply, which doesn't
15407 // use the size of the parameters.
15408 if (S.getLangOpts().CPlusPlus && !FD->isExternC())
15409 return false;
15410
15411 // Stdcall, fastcall, and vectorcall need this special treatment.
15412 CallingConv CC = FD->getType()->castAs<FunctionType>()->getCallConv();
15413 switch (CC) {
15414 case CC_X86StdCall:
15415 case CC_X86FastCall:
15416 case CC_X86VectorCall:
15417 return true;
15418 default:
15419 break;
15420 }
15421 return false;
15422 }
15423
15424 /// Require that all of the parameter types of function be complete. Normally,
15425 /// parameter types are only required to be complete when a function is called
15426 /// or defined, but to mangle functions with certain calling conventions, the
15427 /// mangler needs to know the size of the parameter list. In this situation,
15428 /// MSVC doesn't emit an error or instantiate templates. Instead, MSVC mangles
15429 /// the function as _foo@0, i.e. zero bytes of parameters, which will usually
15430 /// result in a linker error. Clang doesn't implement this behavior, and instead
15431 /// attempts to error at compile time.
15432 static void CheckCompleteParameterTypesForMangler(Sema &S, FunctionDecl *FD,
15433 SourceLocation Loc) {
15434 class ParamIncompleteTypeDiagnoser : public Sema::TypeDiagnoser {
15435 FunctionDecl *FD;
15436 ParmVarDecl *Param;
15437
15438 public:
15439 ParamIncompleteTypeDiagnoser(FunctionDecl *FD, ParmVarDecl *Param)
15440 : FD(FD), Param(Param) {}
15441
15442 void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
15443 CallingConv CC = FD->getType()->castAs<FunctionType>()->getCallConv();
15444 StringRef CCName;
15445 switch (CC) {
15446 case CC_X86StdCall:
15447 CCName = "stdcall";
15448 break;
15449 case CC_X86FastCall:
15450 CCName = "fastcall";
15451 break;
15452 case CC_X86VectorCall:
15453 CCName = "vectorcall";
15454 break;
15455 default:
15456 llvm_unreachable("CC does not need mangling");
15457 }
15458
15459 S.Diag(Loc, diag::err_cconv_incomplete_param_type)
15460 << Param->getDeclName() << FD->getDeclName() << CCName;
15461 }
15462 };
15463
15464 for (ParmVarDecl *Param : FD->parameters()) {
15465 ParamIncompleteTypeDiagnoser Diagnoser(FD, Param);
15466 S.RequireCompleteType(Loc, Param->getType(), Diagnoser);
15467 }
15468 }
15469
15470 namespace {
15471 enum class OdrUseContext {
15472 /// Declarations in this context are not odr-used.
15473 None,
15474 /// Declarations in this context are formally odr-used, but this is a
15475 /// dependent context.
15476 Dependent,
15477 /// Declarations in this context are odr-used but not actually used (yet).
15478 FormallyOdrUsed,
15479 /// Declarations in this context are used.
15480 Used
15481 };
15482 }
15483
15484 /// Are we within a context in which references to resolved functions or to
15485 /// variables result in odr-use?
15486 static OdrUseContext isOdrUseContext(Sema &SemaRef) {
15487 OdrUseContext Result;
15488
15489 switch (SemaRef.ExprEvalContexts.back().Context) {
15490 case Sema::ExpressionEvaluationContext::Unevaluated:
15491 case Sema::ExpressionEvaluationContext::UnevaluatedList:
15492 case Sema::ExpressionEvaluationContext::UnevaluatedAbstract:
15493 return OdrUseContext::None;
15494
15495 case Sema::ExpressionEvaluationContext::ConstantEvaluated:
15496 case Sema::ExpressionEvaluationContext::PotentiallyEvaluated:
15497 Result = OdrUseContext::Used;
15498 break;
15499
15500 case Sema::ExpressionEvaluationContext::DiscardedStatement:
15501 Result = OdrUseContext::FormallyOdrUsed;
15502 break;
15503
15504 case Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
15505 // A default argument formally results in odr-use, but doesn't actually
15506 // result in a use in any real sense until it itself is used.
15507 Result = OdrUseContext::FormallyOdrUsed;
15508 break;
15509 }
15510
15511 if (SemaRef.CurContext->isDependentContext())
15512 return OdrUseContext::Dependent;
15513
15514 return Result;
15515 }
15516
15517 static bool isImplicitlyDefinableConstexprFunction(FunctionDecl *Func) {
15518 return Func->isConstexpr() &&
15519 (Func->isImplicitlyInstantiable() || !Func->isUserProvided());
15520 }
15521
15522 /// Mark a function referenced, and check whether it is odr-used
15523 /// (C++ [basic.def.odr]p2, C99 6.9p3)
15524 void Sema::MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func,
15525 bool MightBeOdrUse) {
15526 assert(Func && "No function?");
15527
15528 Func->setReferenced();
15529
15530 // Recursive functions aren't really used until they're used from some other
15531 // context.
15532 bool IsRecursiveCall = CurContext == Func;
15533
15534 // C++11 [basic.def.odr]p3:
15535 // A function whose name appears as a potentially-evaluated expression is
15536 // odr-used if it is the unique lookup result or the selected member of a
15537 // set of overloaded functions [...].
15538 //
15539 // We (incorrectly) mark overload resolution as an unevaluated context, so we
15540 // can just check that here.
15541 OdrUseContext OdrUse =
15542 MightBeOdrUse ? isOdrUseContext(*this) : OdrUseContext::None;
15543 if (IsRecursiveCall && OdrUse == OdrUseContext::Used)
15544 OdrUse = OdrUseContext::FormallyOdrUsed;
15545
15546 // Trivial default constructors and destructors are never actually used.
15547 // FIXME: What about other special members?
15548 if (Func->isTrivial() && !Func->hasAttr<DLLExportAttr>() &&
15549 OdrUse == OdrUseContext::Used) {
15550 if (auto *Constructor = dyn_cast<CXXConstructorDecl>(Func))
15551 if (Constructor->isDefaultConstructor())
15552 OdrUse = OdrUseContext::FormallyOdrUsed;
15553 if (isa<CXXDestructorDecl>(Func))
15554 OdrUse = OdrUseContext::FormallyOdrUsed;
15555 }
15556
15557 // C++20 [expr.const]p12:
15558 // A function [...] is needed for constant evaluation if it is [...] a
15559 // constexpr function that is named by an expression that is potentially
15560 // constant evaluated
15561 bool NeededForConstantEvaluation =
15562 isPotentiallyConstantEvaluatedContext(*this) &&
15563 isImplicitlyDefinableConstexprFunction(Func);
15564
15565 // Determine whether we require a function definition to exist, per
15566 // C++11 [temp.inst]p3:
15567 // Unless a function template specialization has been explicitly
15568 // instantiated or explicitly specialized, the function template
15569 // specialization is implicitly instantiated when the specialization is
15570 // referenced in a context that requires a function definition to exist.
15571 // C++20 [temp.inst]p7:
15572 // The existence of a definition of a [...] function is considered to
15573 // affect the semantics of the program if the [...] function is needed for
15574 // constant evaluation by an expression
15575 // C++20 [basic.def.odr]p10:
15576 // Every program shall contain exactly one definition of every non-inline
15577 // function or variable that is odr-used in that program outside of a
15578 // discarded statement
15579 // C++20 [special]p1:
15580 // The implementation will implicitly define [defaulted special members]
15581 // if they are odr-used or needed for constant evaluation.
15582 //
15583 // Note that we skip the implicit instantiation of templates that are only
15584 // used in unused default arguments or by recursive calls to themselves.
15585 // This is formally non-conforming, but seems reasonable in practice.
15586 bool NeedDefinition = !IsRecursiveCall && (OdrUse == OdrUseContext::Used ||
15587 NeededForConstantEvaluation);
15588
15589 // C++14 [temp.expl.spec]p6:
15590 // If a template [...] is explicitly specialized then that specialization
15591 // shall be declared before the first use of that specialization that would
15592 // cause an implicit instantiation to take place, in every translation unit
15593 // in which such a use occurs
15594 if (NeedDefinition &&
15595 (Func->getTemplateSpecializationKind() != TSK_Undeclared ||
15596 Func->getMemberSpecializationInfo()))
15597 checkSpecializationVisibility(Loc, Func);
15598
15599 if (getLangOpts().CUDA)
15600 CheckCUDACall(Loc, Func);
15601
15602 // If we need a definition, try to create one.
15603 if (NeedDefinition && !Func->getBody()) {
15604 runWithSufficientStackSpace(Loc, [&] {
15605 if (CXXConstructorDecl *Constructor =
15606 dyn_cast<CXXConstructorDecl>(Func)) {
15607 Constructor = cast<CXXConstructorDecl>(Constructor->getFirstDecl());
15608 if (Constructor->isDefaulted() && !Constructor->isDeleted()) {
15609 if (Constructor->isDefaultConstructor()) {
15610 if (Constructor->isTrivial() &&
15611 !Constructor->hasAttr<DLLExportAttr>())
15612 return;
15613 DefineImplicitDefaultConstructor(Loc, Constructor);
15614 } else if (Constructor->isCopyConstructor()) {
15615 DefineImplicitCopyConstructor(Loc, Constructor);
15616 } else if (Constructor->isMoveConstructor()) {
15617 DefineImplicitMoveConstructor(Loc, Constructor);
15618 }
15619 } else if (Constructor->getInheritedConstructor()) {
15620 DefineInheritingConstructor(Loc, Constructor);
15621 }
15622 } else if (CXXDestructorDecl *Destructor =
15623 dyn_cast<CXXDestructorDecl>(Func)) {
15624 Destructor = cast<CXXDestructorDecl>(Destructor->getFirstDecl());
15625 if (Destructor->isDefaulted() && !Destructor->isDeleted()) {
15626 if (Destructor->isTrivial() && !Destructor->hasAttr<DLLExportAttr>())
15627 return;
15628 DefineImplicitDestructor(Loc, Destructor);
15629 }
15630 if (Destructor->isVirtual() && getLangOpts().AppleKext)
15631 MarkVTableUsed(Loc, Destructor->getParent());
15632 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(Func)) {
15633 if (MethodDecl->isOverloadedOperator() &&
15634 MethodDecl->getOverloadedOperator() == OO_Equal) {
15635 MethodDecl = cast<CXXMethodDecl>(MethodDecl->getFirstDecl());
15636 if (MethodDecl->isDefaulted() && !MethodDecl->isDeleted()) {
15637 if (MethodDecl->isCopyAssignmentOperator())
15638 DefineImplicitCopyAssignment(Loc, MethodDecl);
15639 else if (MethodDecl->isMoveAssignmentOperator())
15640 DefineImplicitMoveAssignment(Loc, MethodDecl);
15641 }
15642 } else if (isa<CXXConversionDecl>(MethodDecl) &&
15643 MethodDecl->getParent()->isLambda()) {
15644 CXXConversionDecl *Conversion =
15645 cast<CXXConversionDecl>(MethodDecl->getFirstDecl());
15646 if (Conversion->isLambdaToBlockPointerConversion())
15647 DefineImplicitLambdaToBlockPointerConversion(Loc, Conversion);
15648 else
15649 DefineImplicitLambdaToFunctionPointerConversion(Loc, Conversion);
15650 } else if (MethodDecl->isVirtual() && getLangOpts().AppleKext)
15651 MarkVTableUsed(Loc, MethodDecl->getParent());
15652 }
15653
15654 if (Func->isDefaulted() && !Func->isDeleted()) {
15655 DefaultedComparisonKind DCK = getDefaultedComparisonKind(Func);
15656 if (DCK != DefaultedComparisonKind::None)
15657 DefineDefaultedComparison(Loc, Func, DCK);
15658 }
15659
15660 // Implicit instantiation of function templates and member functions of
15661 // class templates.
15662 if (Func->isImplicitlyInstantiable()) {
15663 TemplateSpecializationKind TSK =
15664 Func->getTemplateSpecializationKindForInstantiation();
15665 SourceLocation PointOfInstantiation = Func->getPointOfInstantiation();
15666 bool FirstInstantiation = PointOfInstantiation.isInvalid();
15667 if (FirstInstantiation) {
15668 PointOfInstantiation = Loc;
15669 Func->setTemplateSpecializationKind(TSK, PointOfInstantiation);
15670 } else if (TSK != TSK_ImplicitInstantiation) {
15671 // Use the point of use as the point of instantiation, instead of the
15672 // point of explicit instantiation (which we track as the actual point
15673 // of instantiation). This gives better backtraces in diagnostics.
15674 PointOfInstantiation = Loc;
15675 }
15676
15677 if (FirstInstantiation || TSK != TSK_ImplicitInstantiation ||
15678 Func->isConstexpr()) {
15679 if (isa<CXXRecordDecl>(Func->getDeclContext()) &&
15680 cast<CXXRecordDecl>(Func->getDeclContext())->isLocalClass() &&
15681 CodeSynthesisContexts.size())
15682 PendingLocalImplicitInstantiations.push_back(
15683 std::make_pair(Func, PointOfInstantiation));
15684 else if (Func->isConstexpr())
15685 // Do not defer instantiations of constexpr functions, to avoid the
15686 // expression evaluator needing to call back into Sema if it sees a
15687 // call to such a function.
15688 InstantiateFunctionDefinition(PointOfInstantiation, Func);
15689 else {
15690 Func->setInstantiationIsPending(true);
15691 PendingInstantiations.push_back(
15692 std::make_pair(Func, PointOfInstantiation));
15693 // Notify the consumer that a function was implicitly instantiated.
15694 Consumer.HandleCXXImplicitFunctionInstantiation(Func);
15695 }
15696 }
15697 } else {
15698 // Walk redefinitions, as some of them may be instantiable.
15699 for (auto i : Func->redecls()) {
15700 if (!i->isUsed(false) && i->isImplicitlyInstantiable())
15701 MarkFunctionReferenced(Loc, i, MightBeOdrUse);
15702 }
15703 }
15704 });
15705 }
15706
15707 // C++14 [except.spec]p17:
15708 // An exception-specification is considered to be needed when:
15709 // - the function is odr-used or, if it appears in an unevaluated operand,
15710 // would be odr-used if the expression were potentially-evaluated;
15711 //
15712 // Note, we do this even if MightBeOdrUse is false. That indicates that the
15713 // function is a pure virtual function we're calling, and in that case the
15714 // function was selected by overload resolution and we need to resolve its
15715 // exception specification for a different reason.
15716 const FunctionProtoType *FPT = Func->getType()->getAs<FunctionProtoType>();
15717 if (FPT && isUnresolvedExceptionSpec(FPT->getExceptionSpecType()))
15718 ResolveExceptionSpec(Loc, FPT);
15719
15720 // If this is the first "real" use, act on that.
15721 if (OdrUse == OdrUseContext::Used && !Func->isUsed(/*CheckUsedAttr=*/false)) {
15722 // Keep track of used but undefined functions.
15723 if (!Func->isDefined()) {
15724 if (mightHaveNonExternalLinkage(Func))
15725 UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
15726 else if (Func->getMostRecentDecl()->isInlined() &&
15727 !LangOpts.GNUInline &&
15728 !Func->getMostRecentDecl()->hasAttr<GNUInlineAttr>())
15729 UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
15730 else if (isExternalWithNoLinkageType(Func))
15731 UndefinedButUsed.insert(std::make_pair(Func->getCanonicalDecl(), Loc));
15732 }
15733
15734 // Some x86 Windows calling conventions mangle the size of the parameter
15735 // pack into the name. Computing the size of the parameters requires the
15736 // parameter types to be complete. Check that now.
15737 if (funcHasParameterSizeMangling(*this, Func))
15738 CheckCompleteParameterTypesForMangler(*this, Func, Loc);
15739
15740 Func->markUsed(Context);
15741 }
15742
15743 if (LangOpts.OpenMP) {
15744 markOpenMPDeclareVariantFuncsReferenced(Loc, Func, MightBeOdrUse);
15745 if (LangOpts.OpenMPIsDevice)
15746 checkOpenMPDeviceFunction(Loc, Func);
15747 else
15748 checkOpenMPHostFunction(Loc, Func);
15749 }
15750 }
15751
15752 /// Directly mark a variable odr-used. Given a choice, prefer to use
15753 /// MarkVariableReferenced since it does additional checks and then
15754 /// calls MarkVarDeclODRUsed.
15755 /// If the variable must be captured:
15756 /// - if FunctionScopeIndexToStopAt is null, capture it in the CurContext
15757 /// - else capture it in the DeclContext that maps to the
15758 /// *FunctionScopeIndexToStopAt on the FunctionScopeInfo stack.
15759 static void
15760 MarkVarDeclODRUsed(VarDecl *Var, SourceLocation Loc, Sema &SemaRef,
15761 const unsigned *const FunctionScopeIndexToStopAt = nullptr) {
15762 // Keep track of used but undefined variables.
15763 // FIXME: We shouldn't suppress this warning for static data members.
15764 if (Var->hasDefinition(SemaRef.Context) == VarDecl::DeclarationOnly &&
15765 (!Var->isExternallyVisible() || Var->isInline() ||
15766 SemaRef.isExternalWithNoLinkageType(Var)) &&
15767 !(Var->isStaticDataMember() && Var->hasInit())) {
15768 SourceLocation &old = SemaRef.UndefinedButUsed[Var->getCanonicalDecl()];
15769 if (old.isInvalid())
15770 old = Loc;
15771 }
15772 QualType CaptureType, DeclRefType;
15773 if (SemaRef.LangOpts.OpenMP)
15774 SemaRef.tryCaptureOpenMPLambdas(Var);
15775 SemaRef.tryCaptureVariable(Var, Loc, Sema::TryCapture_Implicit,
15776 /*EllipsisLoc*/ SourceLocation(),
15777 /*BuildAndDiagnose*/ true,
15778 CaptureType, DeclRefType,
15779 FunctionScopeIndexToStopAt);
15780
15781 Var->markUsed(SemaRef.Context);
15782 }
15783
15784 void Sema::MarkCaptureUsedInEnclosingContext(VarDecl *Capture,
15785 SourceLocation Loc,
15786 unsigned CapturingScopeIndex) {
15787 MarkVarDeclODRUsed(Capture, Loc, *this, &CapturingScopeIndex);
15788 }
15789
15790 static void
15791 diagnoseUncapturableValueReference(Sema &S, SourceLocation loc,
15792 ValueDecl *var, DeclContext *DC) {
15793 DeclContext *VarDC = var->getDeclContext();
15794
15795 // If the parameter still belongs to the translation unit, then
15796 // we're actually just using one parameter in the declaration of
15797 // the next.
15798 if (isa<ParmVarDecl>(var) &&
15799 isa<TranslationUnitDecl>(VarDC))
15800 return;
15801
15802 // For C code, don't diagnose about capture if we're not actually in code
15803 // right now; it's impossible to write a non-constant expression outside of
15804 // function context, so we'll get other (more useful) diagnostics later.
15805 //
15806 // For C++, things get a bit more nasty... it would be nice to suppress this
15807 // diagnostic for certain cases like using a local variable in an array bound
15808 // for a member of a local class, but the correct predicate is not obvious.
15809 if (!S.getLangOpts().CPlusPlus && !S.CurContext->isFunctionOrMethod())
15810 return;
15811
15812 unsigned ValueKind = isa<BindingDecl>(var) ? 1 : 0;
15813 unsigned ContextKind = 3; // unknown
15814 if (isa<CXXMethodDecl>(VarDC) &&
15815 cast<CXXRecordDecl>(VarDC->getParent())->isLambda()) {
15816 ContextKind = 2;
15817 } else if (isa<FunctionDecl>(VarDC)) {
15818 ContextKind = 0;
15819 } else if (isa<BlockDecl>(VarDC)) {
15820 ContextKind = 1;
15821 }
15822
15823 S.Diag(loc, diag::err_reference_to_local_in_enclosing_context)
15824 << var << ValueKind << ContextKind << VarDC;
15825 S.Diag(var->getLocation(), diag::note_entity_declared_at)
15826 << var;
15827
15828 // FIXME: Add additional diagnostic info about class etc. which prevents
15829 // capture.
15830 }
15831
15832
15833 static bool isVariableAlreadyCapturedInScopeInfo(CapturingScopeInfo *CSI, VarDecl *Var,
15834 bool &SubCapturesAreNested,
15835 QualType &CaptureType,
15836 QualType &DeclRefType) {
15837 // Check whether we've already captured it.
15838 if (CSI->CaptureMap.count(Var)) {
15839 // If we found a capture, any subcaptures are nested.
15840 SubCapturesAreNested = true;
15841
15842 // Retrieve the capture type for this variable.
15843 CaptureType = CSI->getCapture(Var).getCaptureType();
15844
15845 // Compute the type of an expression that refers to this variable.
15846 DeclRefType = CaptureType.getNonReferenceType();
15847
15848 // Similarly to mutable captures in lambda, all the OpenMP captures by copy
15849 // are mutable in the sense that user can change their value - they are
15850 // private instances of the captured declarations.
15851 const Capture &Cap = CSI->getCapture(Var);
15852 if (Cap.isCopyCapture() &&
15853 !(isa<LambdaScopeInfo>(CSI) && cast<LambdaScopeInfo>(CSI)->Mutable) &&
15854 !(isa<CapturedRegionScopeInfo>(CSI) &&
15855 cast<CapturedRegionScopeInfo>(CSI)->CapRegionKind == CR_OpenMP))
15856 DeclRefType.addConst();
15857 return true;
15858 }
15859 return false;
15860 }
15861
15862 // Only block literals, captured statements, and lambda expressions can
15863 // capture; other scopes don't work.
15864 static DeclContext *getParentOfCapturingContextOrNull(DeclContext *DC, VarDecl *Var,
15865 SourceLocation Loc,
15866 const bool Diagnose, Sema &S) {
15867 if (isa<BlockDecl>(DC) || isa<CapturedDecl>(DC) || isLambdaCallOperator(DC))
15868 return getLambdaAwareParentOfDeclContext(DC);
15869 else if (Var->hasLocalStorage()) {
15870 if (Diagnose)
15871 diagnoseUncapturableValueReference(S, Loc, Var, DC);
15872 }
15873 return nullptr;
15874 }
15875
15876 // Certain capturing entities (lambdas, blocks etc.) are not allowed to capture
15877 // certain types of variables (unnamed, variably modified types etc.)
15878 // so check for eligibility.
15879 static bool isVariableCapturable(CapturingScopeInfo *CSI, VarDecl *Var,
15880 SourceLocation Loc,
15881 const bool Diagnose, Sema &S) {
15882
15883 bool IsBlock = isa<BlockScopeInfo>(CSI);
15884 bool IsLambda = isa<LambdaScopeInfo>(CSI);
15885
15886 // Lambdas are not allowed to capture unnamed variables
15887 // (e.g. anonymous unions).
15888 // FIXME: The C++11 rule don't actually state this explicitly, but I'm
15889 // assuming that's the intent.
15890 if (IsLambda && !Var->getDeclName()) {
15891 if (Diagnose) {
15892 S.Diag(Loc, diag::err_lambda_capture_anonymous_var);
15893 S.Diag(Var->getLocation(), diag::note_declared_at);
15894 }
15895 return false;
15896 }
15897
15898 // Prohibit variably-modified types in blocks; they're difficult to deal with.
15899 if (Var->getType()->isVariablyModifiedType() && IsBlock) {
15900 if (Diagnose) {
15901 S.Diag(Loc, diag::err_ref_vm_type);
15902 S.Diag(Var->getLocation(), diag::note_previous_decl)
15903 << Var->getDeclName();
15904 }
15905 return false;
15906 }
15907 // Prohibit structs with flexible array members too.
15908 // We cannot capture what is in the tail end of the struct.
15909 if (const RecordType *VTTy = Var->getType()->getAs<RecordType>()) {
15910 if (VTTy->getDecl()->hasFlexibleArrayMember()) {
15911 if (Diagnose) {
15912 if (IsBlock)
15913 S.Diag(Loc, diag::err_ref_flexarray_type);
15914 else
15915 S.Diag(Loc, diag::err_lambda_capture_flexarray_type)
15916 << Var->getDeclName();
15917 S.Diag(Var->getLocation(), diag::note_previous_decl)
15918 << Var->getDeclName();
15919 }
15920 return false;
15921 }
15922 }
15923 const bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
15924 // Lambdas and captured statements are not allowed to capture __block
15925 // variables; they don't support the expected semantics.
15926 if (HasBlocksAttr && (IsLambda || isa<CapturedRegionScopeInfo>(CSI))) {
15927 if (Diagnose) {
15928 S.Diag(Loc, diag::err_capture_block_variable)
15929 << Var->getDeclName() << !IsLambda;
15930 S.Diag(Var->getLocation(), diag::note_previous_decl)
15931 << Var->getDeclName();
15932 }
15933 return false;
15934 }
15935 // OpenCL v2.0 s6.12.5: Blocks cannot reference/capture other blocks
15936 if (S.getLangOpts().OpenCL && IsBlock &&
15937 Var->getType()->isBlockPointerType()) {
15938 if (Diagnose)
15939 S.Diag(Loc, diag::err_opencl_block_ref_block);
15940 return false;
15941 }
15942
15943 return true;
15944 }
15945
15946 // Returns true if the capture by block was successful.
15947 static bool captureInBlock(BlockScopeInfo *BSI, VarDecl *Var,
15948 SourceLocation Loc,
15949 const bool BuildAndDiagnose,
15950 QualType &CaptureType,
15951 QualType &DeclRefType,
15952 const bool Nested,
15953 Sema &S, bool Invalid) {
15954 bool ByRef = false;
15955
15956 // Blocks are not allowed to capture arrays, excepting OpenCL.
15957 // OpenCL v2.0 s1.12.5 (revision 40): arrays are captured by reference
15958 // (decayed to pointers).
15959 if (!Invalid && !S.getLangOpts().OpenCL && CaptureType->isArrayType()) {
15960 if (BuildAndDiagnose) {
15961 S.Diag(Loc, diag::err_ref_array_type);
15962 S.Diag(Var->getLocation(), diag::note_previous_decl)
15963 << Var->getDeclName();
15964 Invalid = true;
15965 } else {
15966 return false;
15967 }
15968 }
15969
15970 // Forbid the block-capture of autoreleasing variables.
15971 if (!Invalid &&
15972 CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
15973 if (BuildAndDiagnose) {
15974 S.Diag(Loc, diag::err_arc_autoreleasing_capture)
15975 << /*block*/ 0;
15976 S.Diag(Var->getLocation(), diag::note_previous_decl)
15977 << Var->getDeclName();
15978 Invalid = true;
15979 } else {
15980 return false;
15981 }
15982 }
15983
15984 // Warn about implicitly autoreleasing indirect parameters captured by blocks.
15985 if (const auto *PT = CaptureType->getAs<PointerType>()) {
15986 QualType PointeeTy = PT->getPointeeType();
15987
15988 if (!Invalid && PointeeTy->getAs<ObjCObjectPointerType>() &&
15989 PointeeTy.getObjCLifetime() == Qualifiers::OCL_Autoreleasing &&
15990 !S.Context.hasDirectOwnershipQualifier(PointeeTy)) {
15991 if (BuildAndDiagnose) {
15992 SourceLocation VarLoc = Var->getLocation();
15993 S.Diag(Loc, diag::warn_block_capture_autoreleasing);
15994 S.Diag(VarLoc, diag::note_declare_parameter_strong);
15995 }
15996 }
15997 }
15998
15999 const bool HasBlocksAttr = Var->hasAttr<BlocksAttr>();
16000 if (HasBlocksAttr || CaptureType->isReferenceType() ||
16001 (S.getLangOpts().OpenMP && S.isOpenMPCapturedDecl(Var))) {
16002 // Block capture by reference does not change the capture or
16003 // declaration reference types.
16004 ByRef = true;
16005 } else {
16006 // Block capture by copy introduces 'const'.
16007 CaptureType = CaptureType.getNonReferenceType().withConst();
16008 DeclRefType = CaptureType;
16009 }
16010
16011 // Actually capture the variable.
16012 if (BuildAndDiagnose)
16013 BSI->addCapture(Var, HasBlocksAttr, ByRef, Nested, Loc, SourceLocation(),
16014 CaptureType, Invalid);
16015
16016 return !Invalid;
16017 }
16018
16019
16020 /// Capture the given variable in the captured region.
16021 static bool captureInCapturedRegion(CapturedRegionScopeInfo *RSI,
16022 VarDecl *Var,
16023 SourceLocation Loc,
16024 const bool BuildAndDiagnose,
16025 QualType &CaptureType,
16026 QualType &DeclRefType,
16027 const bool RefersToCapturedVariable,
16028 Sema &S, bool Invalid) {
16029 // By default, capture variables by reference.
16030 bool ByRef = true;
16031 // Using an LValue reference type is consistent with Lambdas (see below).
16032 if (S.getLangOpts().OpenMP && RSI->CapRegionKind == CR_OpenMP) {
16033 if (S.isOpenMPCapturedDecl(Var)) {
16034 bool HasConst = DeclRefType.isConstQualified();
16035 DeclRefType = DeclRefType.getUnqualifiedType();
16036 // Don't lose diagnostics about assignments to const.
16037 if (HasConst)
16038 DeclRefType.addConst();
16039 }
16040 ByRef = S.isOpenMPCapturedByRef(Var, RSI->OpenMPLevel,
16041 RSI->OpenMPCaptureLevel);
16042 }
16043
16044 if (ByRef)
16045 CaptureType = S.Context.getLValueReferenceType(DeclRefType);
16046 else
16047 CaptureType = DeclRefType;
16048
16049 // Actually capture the variable.
16050 if (BuildAndDiagnose)
16051 RSI->addCapture(Var, /*isBlock*/ false, ByRef, RefersToCapturedVariable,
16052 Loc, SourceLocation(), CaptureType, Invalid);
16053
16054 return !Invalid;
16055 }
16056
16057 /// Capture the given variable in the lambda.
16058 static bool captureInLambda(LambdaScopeInfo *LSI,
16059 VarDecl *Var,
16060 SourceLocation Loc,
16061 const bool BuildAndDiagnose,
16062 QualType &CaptureType,
16063 QualType &DeclRefType,
16064 const bool RefersToCapturedVariable,
16065 const Sema::TryCaptureKind Kind,
16066 SourceLocation EllipsisLoc,
16067 const bool IsTopScope,
16068 Sema &S, bool Invalid) {
16069 // Determine whether we are capturing by reference or by value.
16070 bool ByRef = false;
16071 if (IsTopScope && Kind != Sema::TryCapture_Implicit) {
16072 ByRef = (Kind == Sema::TryCapture_ExplicitByRef);
16073 } else {
16074 ByRef = (LSI->ImpCaptureStyle == LambdaScopeInfo::ImpCap_LambdaByref);
16075 }
16076
16077 // Compute the type of the field that will capture this variable.
16078 if (ByRef) {
16079 // C++11 [expr.prim.lambda]p15:
16080 // An entity is captured by reference if it is implicitly or
16081 // explicitly captured but not captured by copy. It is
16082 // unspecified whether additional unnamed non-static data
16083 // members are declared in the closure type for entities
16084 // captured by reference.
16085 //
16086 // FIXME: It is not clear whether we want to build an lvalue reference
16087 // to the DeclRefType or to CaptureType.getNonReferenceType(). GCC appears
16088 // to do the former, while EDG does the latter. Core issue 1249 will
16089 // clarify, but for now we follow GCC because it's a more permissive and
16090 // easily defensible position.
16091 CaptureType = S.Context.getLValueReferenceType(DeclRefType);
16092 } else {
16093 // C++11 [expr.prim.lambda]p14:
16094 // For each entity captured by copy, an unnamed non-static
16095 // data member is declared in the closure type. The
16096 // declaration order of these members is unspecified. The type
16097 // of such a data member is the type of the corresponding
16098 // captured entity if the entity is not a reference to an
16099 // object, or the referenced type otherwise. [Note: If the
16100 // captured entity is a reference to a function, the
16101 // corresponding data member is also a reference to a
16102 // function. - end note ]
16103 if (const ReferenceType *RefType = CaptureType->getAs<ReferenceType>()){
16104 if (!RefType->getPointeeType()->isFunctionType())
16105 CaptureType = RefType->getPointeeType();
16106 }
16107
16108 // Forbid the lambda copy-capture of autoreleasing variables.
16109 if (!Invalid &&
16110 CaptureType.getObjCLifetime() == Qualifiers::OCL_Autoreleasing) {
16111 if (BuildAndDiagnose) {
16112 S.Diag(Loc, diag::err_arc_autoreleasing_capture) << /*lambda*/ 1;
16113 S.Diag(Var->getLocation(), diag::note_previous_decl)
16114 << Var->getDeclName();
16115 Invalid = true;
16116 } else {
16117 return false;
16118 }
16119 }
16120
16121 // Make sure that by-copy captures are of a complete and non-abstract type.
16122 if (!Invalid && BuildAndDiagnose) {
16123 if (!CaptureType->isDependentType() &&
16124 S.RequireCompleteType(Loc, CaptureType,
16125 diag::err_capture_of_incomplete_type,
16126 Var->getDeclName()))
16127 Invalid = true;
16128 else if (S.RequireNonAbstractType(Loc, CaptureType,
16129 diag::err_capture_of_abstract_type))
16130 Invalid = true;
16131 }
16132 }
16133
16134 // Compute the type of a reference to this captured variable.
16135 if (ByRef)
16136 DeclRefType = CaptureType.getNonReferenceType();
16137 else {
16138 // C++ [expr.prim.lambda]p5:
16139 // The closure type for a lambda-expression has a public inline
16140 // function call operator [...]. This function call operator is
16141 // declared const (9.3.1) if and only if the lambda-expression's
16142 // parameter-declaration-clause is not followed by mutable.
16143 DeclRefType = CaptureType.getNonReferenceType();
16144 if (!LSI->Mutable && !CaptureType->isReferenceType())
16145 DeclRefType.addConst();
16146 }
16147
16148 // Add the capture.
16149 if (BuildAndDiagnose)
16150 LSI->addCapture(Var, /*isBlock=*/false, ByRef, RefersToCapturedVariable,
16151 Loc, EllipsisLoc, CaptureType, Invalid);
16152
16153 return !Invalid;
16154 }
16155
16156 bool Sema::tryCaptureVariable(
16157 VarDecl *Var, SourceLocation ExprLoc, TryCaptureKind Kind,
16158 SourceLocation EllipsisLoc, bool BuildAndDiagnose, QualType &CaptureType,
16159 QualType &DeclRefType, const unsigned *const FunctionScopeIndexToStopAt) {
16160 // An init-capture is notionally from the context surrounding its
16161 // declaration, but its parent DC is the lambda class.
16162 DeclContext *VarDC = Var->getDeclContext();
16163 if (Var->isInitCapture())
16164 VarDC = VarDC->getParent();
16165
16166 DeclContext *DC = CurContext;
16167 const unsigned MaxFunctionScopesIndex = FunctionScopeIndexToStopAt
16168 ? *FunctionScopeIndexToStopAt : FunctionScopes.size() - 1;
16169 // We need to sync up the Declaration Context with the
16170 // FunctionScopeIndexToStopAt
16171 if (FunctionScopeIndexToStopAt) {
16172 unsigned FSIndex = FunctionScopes.size() - 1;
16173 while (FSIndex != MaxFunctionScopesIndex) {
16174 DC = getLambdaAwareParentOfDeclContext(DC);
16175 --FSIndex;
16176 }
16177 }
16178
16179
16180 // If the variable is declared in the current context, there is no need to
16181 // capture it.
16182 if (VarDC == DC) return true;
16183
16184 // Capture global variables if it is required to use private copy of this
16185 // variable.
16186 bool IsGlobal = !Var->hasLocalStorage();
16187 if (IsGlobal &&
16188 !(LangOpts.OpenMP && isOpenMPCapturedDecl(Var, /*CheckScopeInfo=*/true,
16189 MaxFunctionScopesIndex)))
16190 return true;
16191 Var = Var->getCanonicalDecl();
16192
16193 // Walk up the stack to determine whether we can capture the variable,
16194 // performing the "simple" checks that don't depend on type. We stop when
16195 // we've either hit the declared scope of the variable or find an existing
16196 // capture of that variable. We start from the innermost capturing-entity
16197 // (the DC) and ensure that all intervening capturing-entities
16198 // (blocks/lambdas etc.) between the innermost capturer and the variable`s
16199 // declcontext can either capture the variable or have already captured
16200 // the variable.
16201 CaptureType = Var->getType();
16202 DeclRefType = CaptureType.getNonReferenceType();
16203 bool Nested = false;
16204 bool Explicit = (Kind != TryCapture_Implicit);
16205 unsigned FunctionScopesIndex = MaxFunctionScopesIndex;
16206 do {
16207 // Only block literals, captured statements, and lambda expressions can
16208 // capture; other scopes don't work.
16209 DeclContext *ParentDC = getParentOfCapturingContextOrNull(DC, Var,
16210 ExprLoc,
16211 BuildAndDiagnose,
16212 *this);
16213 // We need to check for the parent *first* because, if we *have*
16214 // private-captured a global variable, we need to recursively capture it in
16215 // intermediate blocks, lambdas, etc.
16216 if (!ParentDC) {
16217 if (IsGlobal) {
16218 FunctionScopesIndex = MaxFunctionScopesIndex - 1;
16219 break;
16220 }
16221 return true;
16222 }
16223
16224 FunctionScopeInfo *FSI = FunctionScopes[FunctionScopesIndex];
16225 CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FSI);
16226
16227
16228 // Check whether we've already captured it.
16229 if (isVariableAlreadyCapturedInScopeInfo(CSI, Var, Nested, CaptureType,
16230 DeclRefType)) {
16231 CSI->getCapture(Var).markUsed(BuildAndDiagnose);
16232 break;
16233 }
16234 // If we are instantiating a generic lambda call operator body,
16235 // we do not want to capture new variables. What was captured
16236 // during either a lambdas transformation or initial parsing
16237 // should be used.
16238 if (isGenericLambdaCallOperatorSpecialization(DC)) {
16239 if (BuildAndDiagnose) {
16240 LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);
16241 if (LSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None) {
16242 Diag(ExprLoc, diag::err_lambda_impcap) << Var->getDeclName();
16243 Diag(Var->getLocation(), diag::note_previous_decl)
16244 << Var->getDeclName();
16245 Diag(LSI->Lambda->getBeginLoc(), diag::note_lambda_decl);
16246 } else
16247 diagnoseUncapturableValueReference(*this, ExprLoc, Var, DC);
16248 }
16249 return true;
16250 }
16251
16252 // Try to capture variable-length arrays types.
16253 if (Var->getType()->isVariablyModifiedType()) {
16254 // We're going to walk down into the type and look for VLA
16255 // expressions.
16256 QualType QTy = Var->getType();
16257 if (ParmVarDecl *PVD = dyn_cast_or_null<ParmVarDecl>(Var))
16258 QTy = PVD->getOriginalType();
16259 captureVariablyModifiedType(Context, QTy, CSI);
16260 }
16261
16262 if (getLangOpts().OpenMP) {
16263 if (auto *RSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
16264 // OpenMP private variables should not be captured in outer scope, so
16265 // just break here. Similarly, global variables that are captured in a
16266 // target region should not be captured outside the scope of the region.
16267 if (RSI->CapRegionKind == CR_OpenMP) {
16268 bool IsOpenMPPrivateDecl = isOpenMPPrivateDecl(Var, RSI->OpenMPLevel);
16269 // If the variable is private (i.e. not captured) and has variably
16270 // modified type, we still need to capture the type for correct
16271 // codegen in all regions, associated with the construct. Currently,
16272 // it is captured in the innermost captured region only.
16273 if (IsOpenMPPrivateDecl && Var->getType()->isVariablyModifiedType()) {
16274 QualType QTy = Var->getType();
16275 if (ParmVarDecl *PVD = dyn_cast_or_null<ParmVarDecl>(Var))
16276 QTy = PVD->getOriginalType();
16277 for (int I = 1, E = getNumberOfConstructScopes(RSI->OpenMPLevel);
16278 I < E; ++I) {
16279 auto *OuterRSI = cast<CapturedRegionScopeInfo>(
16280 FunctionScopes[FunctionScopesIndex - I]);
16281 assert(RSI->OpenMPLevel == OuterRSI->OpenMPLevel &&
16282 "Wrong number of captured regions associated with the "
16283 "OpenMP construct.");
16284 captureVariablyModifiedType(Context, QTy, OuterRSI);
16285 }
16286 }
16287 bool IsTargetCap = !IsOpenMPPrivateDecl &&
16288 isOpenMPTargetCapturedDecl(Var, RSI->OpenMPLevel);
16289 // When we detect target captures we are looking from inside the
16290 // target region, therefore we need to propagate the capture from the
16291 // enclosing region. Therefore, the capture is not initially nested.
16292 if (IsTargetCap)
16293 adjustOpenMPTargetScopeIndex(FunctionScopesIndex, RSI->OpenMPLevel);
16294
16295 if (IsTargetCap || IsOpenMPPrivateDecl) {
16296 Nested = !IsTargetCap;
16297 DeclRefType = DeclRefType.getUnqualifiedType();
16298 CaptureType = Context.getLValueReferenceType(DeclRefType);
16299 break;
16300 }
16301 }
16302 }
16303 }
16304 if (CSI->ImpCaptureStyle == CapturingScopeInfo::ImpCap_None && !Explicit) {
16305 // No capture-default, and this is not an explicit capture
16306 // so cannot capture this variable.
16307 if (BuildAndDiagnose) {
16308 Diag(ExprLoc, diag::err_lambda_impcap) << Var->getDeclName();
16309 Diag(Var->getLocation(), diag::note_previous_decl)
16310 << Var->getDeclName();
16311 if (cast<LambdaScopeInfo>(CSI)->Lambda)
16312 Diag(cast<LambdaScopeInfo>(CSI)->Lambda->getBeginLoc(),
16313 diag::note_lambda_decl);
16314 // FIXME: If we error out because an outer lambda can not implicitly
16315 // capture a variable that an inner lambda explicitly captures, we
16316 // should have the inner lambda do the explicit capture - because
16317 // it makes for cleaner diagnostics later. This would purely be done
16318 // so that the diagnostic does not misleadingly claim that a variable
16319 // can not be captured by a lambda implicitly even though it is captured
16320 // explicitly. Suggestion:
16321 // - create const bool VariableCaptureWasInitiallyExplicit = Explicit
16322 // at the function head
16323 // - cache the StartingDeclContext - this must be a lambda
16324 // - captureInLambda in the innermost lambda the variable.
16325 }
16326 return true;
16327 }
16328
16329 FunctionScopesIndex--;
16330 DC = ParentDC;
16331 Explicit = false;
16332 } while (!VarDC->Equals(DC));
16333
16334 // Walk back down the scope stack, (e.g. from outer lambda to inner lambda)
16335 // computing the type of the capture at each step, checking type-specific
16336 // requirements, and adding captures if requested.
16337 // If the variable had already been captured previously, we start capturing
16338 // at the lambda nested within that one.
16339 bool Invalid = false;
16340 for (unsigned I = ++FunctionScopesIndex, N = MaxFunctionScopesIndex + 1; I != N;
16341 ++I) {
16342 CapturingScopeInfo *CSI = cast<CapturingScopeInfo>(FunctionScopes[I]);
16343
16344 // Certain capturing entities (lambdas, blocks etc.) are not allowed to capture
16345 // certain types of variables (unnamed, variably modified types etc.)
16346 // so check for eligibility.
16347 if (!Invalid)
16348 Invalid =
16349 !isVariableCapturable(CSI, Var, ExprLoc, BuildAndDiagnose, *this);
16350
16351 // After encountering an error, if we're actually supposed to capture, keep
16352 // capturing in nested contexts to suppress any follow-on diagnostics.
16353 if (Invalid && !BuildAndDiagnose)
16354 return true;
16355
16356 if (BlockScopeInfo *BSI = dyn_cast<BlockScopeInfo>(CSI)) {
16357 Invalid = !captureInBlock(BSI, Var, ExprLoc, BuildAndDiagnose, CaptureType,
16358 DeclRefType, Nested, *this, Invalid);
16359 Nested = true;
16360 } else if (CapturedRegionScopeInfo *RSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) {
16361 Invalid = !captureInCapturedRegion(RSI, Var, ExprLoc, BuildAndDiagnose,
16362 CaptureType, DeclRefType, Nested,
16363 *this, Invalid);
16364 Nested = true;
16365 } else {
16366 LambdaScopeInfo *LSI = cast<LambdaScopeInfo>(CSI);
16367 Invalid =
16368 !captureInLambda(LSI, Var, ExprLoc, BuildAndDiagnose, CaptureType,
16369 DeclRefType, Nested, Kind, EllipsisLoc,
16370 /*IsTopScope*/ I == N - 1, *this, Invalid);
16371 Nested = true;
16372 }
16373
16374 if (Invalid && !BuildAndDiagnose)
16375 return true;
16376 }
16377 return Invalid;
16378 }
16379
16380 bool Sema::tryCaptureVariable(VarDecl *Var, SourceLocation Loc,
16381 TryCaptureKind Kind, SourceLocation EllipsisLoc) {
16382 QualType CaptureType;
16383 QualType DeclRefType;
16384 return tryCaptureVariable(Var, Loc, Kind, EllipsisLoc,
16385 /*BuildAndDiagnose=*/true, CaptureType,
16386 DeclRefType, nullptr);
16387 }
16388
16389 bool Sema::NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc) {
16390 QualType CaptureType;
16391 QualType DeclRefType;
16392 return !tryCaptureVariable(Var, Loc, TryCapture_Implicit, SourceLocation(),
16393 /*BuildAndDiagnose=*/false, CaptureType,
16394 DeclRefType, nullptr);
16395 }
16396
16397 QualType Sema::getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc) {
16398 QualType CaptureType;
16399 QualType DeclRefType;
16400
16401 // Determine whether we can capture this variable.
16402 if (tryCaptureVariable(Var, Loc, TryCapture_Implicit, SourceLocation(),
16403 /*BuildAndDiagnose=*/false, CaptureType,
16404 DeclRefType, nullptr))
16405 return QualType();
16406
16407 return DeclRefType;
16408 }
16409
16410 namespace {
16411 // Helper to copy the template arguments from a DeclRefExpr or MemberExpr.
16412 // The produced TemplateArgumentListInfo* points to data stored within this
16413 // object, so should only be used in contexts where the pointer will not be
16414 // used after the CopiedTemplateArgs object is destroyed.
16415 class CopiedTemplateArgs {
16416 bool HasArgs;
16417 TemplateArgumentListInfo TemplateArgStorage;
16418 public:
16419 template<typename RefExpr>
16420 CopiedTemplateArgs(RefExpr *E) : HasArgs(E->hasExplicitTemplateArgs()) {
16421 if (HasArgs)
16422 E->copyTemplateArgumentsInto(TemplateArgStorage);
16423 }
16424 operator TemplateArgumentListInfo*()
16425 #ifdef __has_cpp_attribute
16426 #if __has_cpp_attribute(clang::lifetimebound)
16427 [[clang::lifetimebound]]
16428 #endif
16429 #endif
16430 {
16431 return HasArgs ? &TemplateArgStorage : nullptr;
16432 }
16433 };
16434 }
16435
16436 /// Walk the set of potential results of an expression and mark them all as
16437 /// non-odr-uses if they satisfy the side-conditions of the NonOdrUseReason.
16438 ///
16439 /// \return A new expression if we found any potential results, ExprEmpty() if
16440 /// not, and ExprError() if we diagnosed an error.
16441 static ExprResult rebuildPotentialResultsAsNonOdrUsed(Sema &S, Expr *E,
16442 NonOdrUseReason NOUR) {
16443 // Per C++11 [basic.def.odr], a variable is odr-used "unless it is
16444 // an object that satisfies the requirements for appearing in a
16445 // constant expression (5.19) and the lvalue-to-rvalue conversion (4.1)
16446 // is immediately applied." This function handles the lvalue-to-rvalue
16447 // conversion part.
16448 //
16449 // If we encounter a node that claims to be an odr-use but shouldn't be, we
16450 // transform it into the relevant kind of non-odr-use node and rebuild the
16451 // tree of nodes leading to it.
16452 //
16453 // This is a mini-TreeTransform that only transforms a restricted subset of
16454 // nodes (and only certain operands of them).
16455
16456 // Rebuild a subexpression.
16457 auto Rebuild = [&](Expr *Sub) {
16458 return rebuildPotentialResultsAsNonOdrUsed(S, Sub, NOUR);
16459 };
16460
16461 // Check whether a potential result satisfies the requirements of NOUR.
16462 auto IsPotentialResultOdrUsed = [&](NamedDecl *D) {
16463 // Any entity other than a VarDecl is always odr-used whenever it's named
16464 // in a potentially-evaluated expression.
16465 auto *VD = dyn_cast<VarDecl>(D);
16466 if (!VD)
16467 return true;
16468
16469 // C++2a [basic.def.odr]p4:
16470 // A variable x whose name appears as a potentially-evalauted expression
16471 // e is odr-used by e unless
16472 // -- x is a reference that is usable in constant expressions, or
16473 // -- x is a variable of non-reference type that is usable in constant
16474 // expressions and has no mutable subobjects, and e is an element of
16475 // the set of potential results of an expression of
16476 // non-volatile-qualified non-class type to which the lvalue-to-rvalue
16477 // conversion is applied, or
16478 // -- x is a variable of non-reference type, and e is an element of the
16479 // set of potential results of a discarded-value expression to which
16480 // the lvalue-to-rvalue conversion is not applied
16481 //
16482 // We check the first bullet and the "potentially-evaluated" condition in
16483 // BuildDeclRefExpr. We check the type requirements in the second bullet
16484 // in CheckLValueToRValueConversionOperand below.
16485 switch (NOUR) {
16486 case NOUR_None:
16487 case NOUR_Unevaluated:
16488 llvm_unreachable("unexpected non-odr-use-reason");
16489
16490 case NOUR_Constant:
16491 // Constant references were handled when they were built.
16492 if (VD->getType()->isReferenceType())
16493 return true;
16494 if (auto *RD = VD->getType()->getAsCXXRecordDecl())
16495 if (RD->hasMutableFields())
16496 return true;
16497 if (!VD->isUsableInConstantExpressions(S.Context))
16498 return true;
16499 break;
16500
16501 case NOUR_Discarded:
16502 if (VD->getType()->isReferenceType())
16503 return true;
16504 break;
16505 }
16506 return false;
16507 };
16508
16509 // Mark that this expression does not constitute an odr-use.
16510 auto MarkNotOdrUsed = [&] {
16511 S.MaybeODRUseExprs.erase(E);
16512 if (LambdaScopeInfo *LSI = S.getCurLambda())
16513 LSI->markVariableExprAsNonODRUsed(E);
16514 };
16515
16516 // C++2a [basic.def.odr]p2:
16517 // The set of potential results of an expression e is defined as follows:
16518 switch (E->getStmtClass()) {
16519 // -- If e is an id-expression, ...
16520 case Expr::DeclRefExprClass: {
16521 auto *DRE = cast<DeclRefExpr>(E);
16522 if (DRE->isNonOdrUse() || IsPotentialResultOdrUsed(DRE->getDecl()))
16523 break;
16524
16525 // Rebuild as a non-odr-use DeclRefExpr.
16526 MarkNotOdrUsed();
16527 return DeclRefExpr::Create(
16528 S.Context, DRE->getQualifierLoc(), DRE->getTemplateKeywordLoc(),
16529 DRE->getDecl(), DRE->refersToEnclosingVariableOrCapture(),
16530 DRE->getNameInfo(), DRE->getType(), DRE->getValueKind(),
16531 DRE->getFoundDecl(), CopiedTemplateArgs(DRE), NOUR);
16532 }
16533
16534 case Expr::FunctionParmPackExprClass: {
16535 auto *FPPE = cast<FunctionParmPackExpr>(E);
16536 // If any of the declarations in the pack is odr-used, then the expression
16537 // as a whole constitutes an odr-use.
16538 for (VarDecl *D : *FPPE)
16539 if (IsPotentialResultOdrUsed(D))
16540 return ExprEmpty();
16541
16542 // FIXME: Rebuild as a non-odr-use FunctionParmPackExpr? In practice,
16543 // nothing cares about whether we marked this as an odr-use, but it might
16544 // be useful for non-compiler tools.
16545 MarkNotOdrUsed();
16546 break;
16547 }
16548
16549 // -- If e is a subscripting operation with an array operand...
16550 case Expr::ArraySubscriptExprClass: {
16551 auto *ASE = cast<ArraySubscriptExpr>(E);
16552 Expr *OldBase = ASE->getBase()->IgnoreImplicit();
16553 if (!OldBase->getType()->isArrayType())
16554 break;
16555 ExprResult Base = Rebuild(OldBase);
16556 if (!Base.isUsable())
16557 return Base;
16558 Expr *LHS = ASE->getBase() == ASE->getLHS() ? Base.get() : ASE->getLHS();
16559 Expr *RHS = ASE->getBase() == ASE->getRHS() ? Base.get() : ASE->getRHS();
16560 SourceLocation LBracketLoc = ASE->getBeginLoc(); // FIXME: Not stored.
16561 return S.ActOnArraySubscriptExpr(nullptr, LHS, LBracketLoc, RHS,
16562 ASE->getRBracketLoc());
16563 }
16564
16565 case Expr::MemberExprClass: {
16566 auto *ME = cast<MemberExpr>(E);
16567 // -- If e is a class member access expression [...] naming a non-static
16568 // data member...
16569 if (isa<FieldDecl>(ME->getMemberDecl())) {
16570 ExprResult Base = Rebuild(ME->getBase());
16571 if (!Base.isUsable())
16572 return Base;
16573 return MemberExpr::Create(
16574 S.Context, Base.get(), ME->isArrow(), ME->getOperatorLoc(),
16575 ME->getQualifierLoc(), ME->getTemplateKeywordLoc(),
16576 ME->getMemberDecl(), ME->getFoundDecl(), ME->getMemberNameInfo(),
16577 CopiedTemplateArgs(ME), ME->getType(), ME->getValueKind(),
16578 ME->getObjectKind(), ME->isNonOdrUse());
16579 }
16580
16581 if (ME->getMemberDecl()->isCXXInstanceMember())
16582 break;
16583
16584 // -- If e is a class member access expression naming a static data member,
16585 // ...
16586 if (ME->isNonOdrUse() || IsPotentialResultOdrUsed(ME->getMemberDecl()))
16587 break;
16588
16589 // Rebuild as a non-odr-use MemberExpr.
16590 MarkNotOdrUsed();
16591 return MemberExpr::Create(
16592 S.Context, ME->getBase(), ME->isArrow(), ME->getOperatorLoc(),
16593 ME->getQualifierLoc(), ME->getTemplateKeywordLoc(), ME->getMemberDecl(),
16594 ME->getFoundDecl(), ME->getMemberNameInfo(), CopiedTemplateArgs(ME),
16595 ME->getType(), ME->getValueKind(), ME->getObjectKind(), NOUR);
16596 return ExprEmpty();
16597 }
16598
16599 case Expr::BinaryOperatorClass: {
16600 auto *BO = cast<BinaryOperator>(E);
16601 Expr *LHS = BO->getLHS();
16602 Expr *RHS = BO->getRHS();
16603 // -- If e is a pointer-to-member expression of the form e1 .* e2 ...
16604 if (BO->getOpcode() == BO_PtrMemD) {
16605 ExprResult Sub = Rebuild(LHS);
16606 if (!Sub.isUsable())
16607 return Sub;
16608 LHS = Sub.get();
16609 // -- If e is a comma expression, ...
16610 } else if (BO->getOpcode() == BO_Comma) {
16611 ExprResult Sub = Rebuild(RHS);
16612 if (!Sub.isUsable())
16613 return Sub;
16614 RHS = Sub.get();
16615 } else {
16616 break;
16617 }
16618 return S.BuildBinOp(nullptr, BO->getOperatorLoc(), BO->getOpcode(),
16619 LHS, RHS);
16620 }
16621
16622 // -- If e has the form (e1)...
16623 case Expr::ParenExprClass: {
16624 auto *PE = cast<ParenExpr>(E);
16625 ExprResult Sub = Rebuild(PE->getSubExpr());
16626 if (!Sub.isUsable())
16627 return Sub;
16628 return S.ActOnParenExpr(PE->getLParen(), PE->getRParen(), Sub.get());
16629 }
16630
16631 // -- If e is a glvalue conditional expression, ...
16632 // We don't apply this to a binary conditional operator. FIXME: Should we?
16633 case Expr::ConditionalOperatorClass: {
16634 auto *CO = cast<ConditionalOperator>(E);
16635 ExprResult LHS = Rebuild(CO->getLHS());
16636 if (LHS.isInvalid())
16637 return ExprError();
16638 ExprResult RHS = Rebuild(CO->getRHS());
16639 if (RHS.isInvalid())
16640 return ExprError();
16641 if (!LHS.isUsable() && !RHS.isUsable())
16642 return ExprEmpty();
16643 if (!LHS.isUsable())
16644 LHS = CO->getLHS();
16645 if (!RHS.isUsable())
16646 RHS = CO->getRHS();
16647 return S.ActOnConditionalOp(CO->getQuestionLoc(), CO->getColonLoc(),
16648 CO->getCond(), LHS.get(), RHS.get());
16649 }
16650
16651 // [Clang extension]
16652 // -- If e has the form __extension__ e1...
16653 case Expr::UnaryOperatorClass: {
16654 auto *UO = cast<UnaryOperator>(E);
16655 if (UO->getOpcode() != UO_Extension)
16656 break;
16657 ExprResult Sub = Rebuild(UO->getSubExpr());
16658 if (!Sub.isUsable())
16659 return Sub;
16660 return S.BuildUnaryOp(nullptr, UO->getOperatorLoc(), UO_Extension,
16661 Sub.get());
16662 }
16663
16664 // [Clang extension]
16665 // -- If e has the form _Generic(...), the set of potential results is the
16666 // union of the sets of potential results of the associated expressions.
16667 case Expr::GenericSelectionExprClass: {
16668 auto *GSE = cast<GenericSelectionExpr>(E);
16669
16670 SmallVector<Expr *, 4> AssocExprs;
16671 bool AnyChanged = false;
16672 for (Expr *OrigAssocExpr : GSE->getAssocExprs()) {
16673 ExprResult AssocExpr = Rebuild(OrigAssocExpr);
16674 if (AssocExpr.isInvalid())
16675 return ExprError();
16676 if (AssocExpr.isUsable()) {
16677 AssocExprs.push_back(AssocExpr.get());
16678 AnyChanged = true;
16679 } else {
16680 AssocExprs.push_back(OrigAssocExpr);
16681 }
16682 }
16683
16684 return AnyChanged ? S.CreateGenericSelectionExpr(
16685 GSE->getGenericLoc(), GSE->getDefaultLoc(),
16686 GSE->getRParenLoc(), GSE->getControllingExpr(),
16687 GSE->getAssocTypeSourceInfos(), AssocExprs)
16688 : ExprEmpty();
16689 }
16690
16691 // [Clang extension]
16692 // -- If e has the form __builtin_choose_expr(...), the set of potential
16693 // results is the union of the sets of potential results of the
16694 // second and third subexpressions.
16695 case Expr::ChooseExprClass: {
16696 auto *CE = cast<ChooseExpr>(E);
16697
16698 ExprResult LHS = Rebuild(CE->getLHS());
16699 if (LHS.isInvalid())
16700 return ExprError();
16701
16702 ExprResult RHS = Rebuild(CE->getLHS());
16703 if (RHS.isInvalid())
16704 return ExprError();
16705
16706 if (!LHS.get() && !RHS.get())
16707 return ExprEmpty();
16708 if (!LHS.isUsable())
16709 LHS = CE->getLHS();
16710 if (!RHS.isUsable())
16711 RHS = CE->getRHS();
16712
16713 return S.ActOnChooseExpr(CE->getBuiltinLoc(), CE->getCond(), LHS.get(),
16714 RHS.get(), CE->getRParenLoc());
16715 }
16716
16717 // Step through non-syntactic nodes.
16718 case Expr::ConstantExprClass: {
16719 auto *CE = cast<ConstantExpr>(E);
16720 ExprResult Sub = Rebuild(CE->getSubExpr());
16721 if (!Sub.isUsable())
16722 return Sub;
16723 return ConstantExpr::Create(S.Context, Sub.get());
16724 }
16725
16726 // We could mostly rely on the recursive rebuilding to rebuild implicit
16727 // casts, but not at the top level, so rebuild them here.
16728 case Expr::ImplicitCastExprClass: {
16729 auto *ICE = cast<ImplicitCastExpr>(E);
16730 // Only step through the narrow set of cast kinds we expect to encounter.
16731 // Anything else suggests we've left the region in which potential results
16732 // can be found.
16733 switch (ICE->getCastKind()) {
16734 case CK_NoOp:
16735 case CK_DerivedToBase:
16736 case CK_UncheckedDerivedToBase: {
16737 ExprResult Sub = Rebuild(ICE->getSubExpr());
16738 if (!Sub.isUsable())
16739 return Sub;
16740 CXXCastPath Path(ICE->path());
16741 return S.ImpCastExprToType(Sub.get(), ICE->getType(), ICE->getCastKind(),
16742 ICE->getValueKind(), &Path);
16743 }
16744
16745 default:
16746 break;
16747 }
16748 break;
16749 }
16750
16751 default:
16752 break;
16753 }
16754
16755 // Can't traverse through this node. Nothing to do.
16756 return ExprEmpty();
16757 }
16758
16759 ExprResult Sema::CheckLValueToRValueConversionOperand(Expr *E) {
16760 // Check whether the operand is or contains an object of non-trivial C union
16761 // type.
16762 if (E->getType().isVolatileQualified() &&
16763 (E->getType().hasNonTrivialToPrimitiveDestructCUnion() ||
16764 E->getType().hasNonTrivialToPrimitiveCopyCUnion()))
16765 checkNonTrivialCUnion(E->getType(), E->getExprLoc(),
16766 Sema::NTCUC_LValueToRValueVolatile,
16767 NTCUK_Destruct|NTCUK_Copy);
16768
16769 // C++2a [basic.def.odr]p4:
16770 // [...] an expression of non-volatile-qualified non-class type to which
16771 // the lvalue-to-rvalue conversion is applied [...]
16772 if (E->getType().isVolatileQualified() || E->getType()->getAs<RecordType>())
16773 return E;
16774
16775 ExprResult Result =
16776 rebuildPotentialResultsAsNonOdrUsed(*this, E, NOUR_Constant);
16777 if (Result.isInvalid())
16778 return ExprError();
16779 return Result.get() ? Result : E;
16780 }
16781
16782 ExprResult Sema::ActOnConstantExpression(ExprResult Res) {
16783 Res = CorrectDelayedTyposInExpr(Res);
16784
16785 if (!Res.isUsable())
16786 return Res;
16787
16788 // If a constant-expression is a reference to a variable where we delay
16789 // deciding whether it is an odr-use, just assume we will apply the
16790 // lvalue-to-rvalue conversion. In the one case where this doesn't happen
16791 // (a non-type template argument), we have special handling anyway.
16792 return CheckLValueToRValueConversionOperand(Res.get());
16793 }
16794
16795 void Sema::CleanupVarDeclMarking() {
16796 // Iterate through a local copy in case MarkVarDeclODRUsed makes a recursive
16797 // call.
16798 MaybeODRUseExprSet LocalMaybeODRUseExprs;
16799 std::swap(LocalMaybeODRUseExprs, MaybeODRUseExprs);
16800
16801 for (Expr *E : LocalMaybeODRUseExprs) {
16802 if (auto *DRE = dyn_cast<DeclRefExpr>(E)) {
16803 MarkVarDeclODRUsed(cast<VarDecl>(DRE->getDecl()),
16804 DRE->getLocation(), *this);
16805 } else if (auto *ME = dyn_cast<MemberExpr>(E)) {
16806 MarkVarDeclODRUsed(cast<VarDecl>(ME->getMemberDecl()), ME->getMemberLoc(),
16807 *this);
16808 } else if (auto *FP = dyn_cast<FunctionParmPackExpr>(E)) {
16809 for (VarDecl *VD : *FP)
16810 MarkVarDeclODRUsed(VD, FP->getParameterPackLocation(), *this);
16811 } else {
16812 llvm_unreachable("Unexpected expression");
16813 }
16814 }
16815
16816 assert(MaybeODRUseExprs.empty() &&
16817 "MarkVarDeclODRUsed failed to cleanup MaybeODRUseExprs?");
16818 }
16819
16820 static void DoMarkVarDeclReferenced(Sema &SemaRef, SourceLocation Loc,
16821 VarDecl *Var, Expr *E) {
16822 assert((!E || isa<DeclRefExpr>(E) || isa<MemberExpr>(E) ||
16823 isa<FunctionParmPackExpr>(E)) &&
16824 "Invalid Expr argument to DoMarkVarDeclReferenced");
16825 Var->setReferenced();
16826
16827 if (Var->isInvalidDecl())
16828 return;
16829
16830 auto *MSI = Var->getMemberSpecializationInfo();
16831 TemplateSpecializationKind TSK = MSI ? MSI->getTemplateSpecializationKind()
16832 : Var->getTemplateSpecializationKind();
16833
16834 OdrUseContext OdrUse = isOdrUseContext(SemaRef);
16835 bool UsableInConstantExpr =
16836 Var->mightBeUsableInConstantExpressions(SemaRef.Context);
16837
16838 // C++20 [expr.const]p12:
16839 // A variable [...] is needed for constant evaluation if it is [...] a
16840 // variable whose name appears as a potentially constant evaluated
16841 // expression that is either a contexpr variable or is of non-volatile
16842 // const-qualified integral type or of reference type
16843 bool NeededForConstantEvaluation =
16844 isPotentiallyConstantEvaluatedContext(SemaRef) && UsableInConstantExpr;
16845
16846 bool NeedDefinition =
16847 OdrUse == OdrUseContext::Used || NeededForConstantEvaluation;
16848
16849 VarTemplateSpecializationDecl *VarSpec =
16850 dyn_cast<VarTemplateSpecializationDecl>(Var);
16851 assert(!isa<VarTemplatePartialSpecializationDecl>(Var) &&
16852 "Can't instantiate a partial template specialization.");
16853
16854 // If this might be a member specialization of a static data member, check
16855 // the specialization is visible. We already did the checks for variable
16856 // template specializations when we created them.
16857 if (NeedDefinition && TSK != TSK_Undeclared &&
16858 !isa<VarTemplateSpecializationDecl>(Var))
16859 SemaRef.checkSpecializationVisibility(Loc, Var);
16860
16861 // Perform implicit instantiation of static data members, static data member
16862 // templates of class templates, and variable template specializations. Delay
16863 // instantiations of variable templates, except for those that could be used
16864 // in a constant expression.
16865 if (NeedDefinition && isTemplateInstantiation(TSK)) {
16866 // Per C++17 [temp.explicit]p10, we may instantiate despite an explicit
16867 // instantiation declaration if a variable is usable in a constant
16868 // expression (among other cases).
16869 bool TryInstantiating =
16870 TSK == TSK_ImplicitInstantiation ||
16871 (TSK == TSK_ExplicitInstantiationDeclaration && UsableInConstantExpr);
16872
16873 if (TryInstantiating) {
16874 SourceLocation PointOfInstantiation =
16875 MSI ? MSI->getPointOfInstantiation() : Var->getPointOfInstantiation();
16876 bool FirstInstantiation = PointOfInstantiation.isInvalid();
16877 if (FirstInstantiation) {
16878 PointOfInstantiation = Loc;
16879 if (MSI)
16880 MSI->setPointOfInstantiation(PointOfInstantiation);
16881 else
16882 Var->setTemplateSpecializationKind(TSK, PointOfInstantiation);
16883 }
16884
16885 bool InstantiationDependent = false;
16886 bool IsNonDependent =
16887 VarSpec ? !TemplateSpecializationType::anyDependentTemplateArguments(
16888 VarSpec->getTemplateArgsInfo(), InstantiationDependent)
16889 : true;
16890
16891 // Do not instantiate specializations that are still type-dependent.
16892 if (IsNonDependent) {
16893 if (UsableInConstantExpr) {
16894 // Do not defer instantiations of variables that could be used in a
16895 // constant expression.
16896 SemaRef.runWithSufficientStackSpace(PointOfInstantiation, [&] {
16897 SemaRef.InstantiateVariableDefinition(PointOfInstantiation, Var);
16898 });
16899 } else if (FirstInstantiation ||
16900 isa<VarTemplateSpecializationDecl>(Var)) {
16901 // FIXME: For a specialization of a variable template, we don't
16902 // distinguish between "declaration and type implicitly instantiated"
16903 // and "implicit instantiation of definition requested", so we have
16904 // no direct way to avoid enqueueing the pending instantiation
16905 // multiple times.
16906 SemaRef.PendingInstantiations
16907 .push_back(std::make_pair(Var, PointOfInstantiation));
16908 }
16909 }
16910 }
16911 }
16912
16913 // C++2a [basic.def.odr]p4:
16914 // A variable x whose name appears as a potentially-evaluated expression e
16915 // is odr-used by e unless
16916 // -- x is a reference that is usable in constant expressions
16917 // -- x is a variable of non-reference type that is usable in constant
16918 // expressions and has no mutable subobjects [FIXME], and e is an
16919 // element of the set of potential results of an expression of
16920 // non-volatile-qualified non-class type to which the lvalue-to-rvalue
16921 // conversion is applied
16922 // -- x is a variable of non-reference type, and e is an element of the set
16923 // of potential results of a discarded-value expression to which the
16924 // lvalue-to-rvalue conversion is not applied [FIXME]
16925 //
16926 // We check the first part of the second bullet here, and
16927 // Sema::CheckLValueToRValueConversionOperand deals with the second part.
16928 // FIXME: To get the third bullet right, we need to delay this even for
16929 // variables that are not usable in constant expressions.
16930
16931 // If we already know this isn't an odr-use, there's nothing more to do.
16932 if (DeclRefExpr *DRE = dyn_cast_or_null<DeclRefExpr>(E))
16933 if (DRE->isNonOdrUse())
16934 return;
16935 if (MemberExpr *ME = dyn_cast_or_null<MemberExpr>(E))
16936 if (ME->isNonOdrUse())
16937 return;
16938
16939 switch (OdrUse) {
16940 case OdrUseContext::None:
16941 assert((!E || isa<FunctionParmPackExpr>(E)) &&
16942 "missing non-odr-use marking for unevaluated decl ref");
16943 break;
16944
16945 case OdrUseContext::FormallyOdrUsed:
16946 // FIXME: Ignoring formal odr-uses results in incorrect lambda capture
16947 // behavior.
16948 break;
16949
16950 case OdrUseContext::Used:
16951 // If we might later find that this expression isn't actually an odr-use,
16952 // delay the marking.
16953 if (E && Var->isUsableInConstantExpressions(SemaRef.Context))
16954 SemaRef.MaybeODRUseExprs.insert(E);
16955 else
16956 MarkVarDeclODRUsed(Var, Loc, SemaRef);
16957 break;
16958
16959 case OdrUseContext::Dependent:
16960 // If this is a dependent context, we don't need to mark variables as
16961 // odr-used, but we may still need to track them for lambda capture.
16962 // FIXME: Do we also need to do this inside dependent typeid expressions
16963 // (which are modeled as unevaluated at this point)?
16964 const bool RefersToEnclosingScope =
16965 (SemaRef.CurContext != Var->getDeclContext() &&
16966 Var->getDeclContext()->isFunctionOrMethod() && Var->hasLocalStorage());
16967 if (RefersToEnclosingScope) {
16968 LambdaScopeInfo *const LSI =
16969 SemaRef.getCurLambda(/*IgnoreNonLambdaCapturingScope=*/true);
16970 if (LSI && (!LSI->CallOperator ||
16971 !LSI->CallOperator->Encloses(Var->getDeclContext()))) {
16972 // If a variable could potentially be odr-used, defer marking it so
16973 // until we finish analyzing the full expression for any
16974 // lvalue-to-rvalue
16975 // or discarded value conversions that would obviate odr-use.
16976 // Add it to the list of potential captures that will be analyzed
16977 // later (ActOnFinishFullExpr) for eventual capture and odr-use marking
16978 // unless the variable is a reference that was initialized by a constant
16979 // expression (this will never need to be captured or odr-used).
16980 //
16981 // FIXME: We can simplify this a lot after implementing P0588R1.
16982 assert(E && "Capture variable should be used in an expression.");
16983 if (!Var->getType()->isReferenceType() ||
16984 !Var->isUsableInConstantExpressions(SemaRef.Context))
16985 LSI->addPotentialCapture(E->IgnoreParens());
16986 }
16987 }
16988 break;
16989 }
16990 }
16991
16992 /// Mark a variable referenced, and check whether it is odr-used
16993 /// (C++ [basic.def.odr]p2, C99 6.9p3). Note that this should not be
16994 /// used directly for normal expressions referring to VarDecl.
16995 void Sema::MarkVariableReferenced(SourceLocation Loc, VarDecl *Var) {
16996 DoMarkVarDeclReferenced(*this, Loc, Var, nullptr);
16997 }
16998
16999 static void MarkExprReferenced(Sema &SemaRef, SourceLocation Loc,
17000 Decl *D, Expr *E, bool MightBeOdrUse) {
17001 if (SemaRef.isInOpenMPDeclareTargetContext())
17002 SemaRef.checkDeclIsAllowedInOpenMPTarget(E, D);
17003
17004 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
17005 DoMarkVarDeclReferenced(SemaRef, Loc, Var, E);
17006 return;
17007 }
17008
17009 SemaRef.MarkAnyDeclReferenced(Loc, D, MightBeOdrUse);
17010
17011 // If this is a call to a method via a cast, also mark the method in the
17012 // derived class used in case codegen can devirtualize the call.
17013 const MemberExpr *ME = dyn_cast<MemberExpr>(E);
17014 if (!ME)
17015 return;
17016 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ME->getMemberDecl());
17017 if (!MD)
17018 return;
17019 // Only attempt to devirtualize if this is truly a virtual call.
17020 bool IsVirtualCall = MD->isVirtual() &&
17021 ME->performsVirtualDispatch(SemaRef.getLangOpts());
17022 if (!IsVirtualCall)
17023 return;
17024
17025 // If it's possible to devirtualize the call, mark the called function
17026 // referenced.
17027 CXXMethodDecl *DM = MD->getDevirtualizedMethod(
17028 ME->getBase(), SemaRef.getLangOpts().AppleKext);
17029 if (DM)
17030 SemaRef.MarkAnyDeclReferenced(Loc, DM, MightBeOdrUse);
17031 }
17032
17033 /// Perform reference-marking and odr-use handling for a DeclRefExpr.
17034 void Sema::MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base) {
17035 // TODO: update this with DR# once a defect report is filed.
17036 // C++11 defect. The address of a pure member should not be an ODR use, even
17037 // if it's a qualified reference.
17038 bool OdrUse = true;
17039 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getDecl()))
17040 if (Method->isVirtual() &&
17041 !Method->getDevirtualizedMethod(Base, getLangOpts().AppleKext))
17042 OdrUse = false;
17043 MarkExprReferenced(*this, E->getLocation(), E->getDecl(), E, OdrUse);
17044 }
17045
17046 /// Perform reference-marking and odr-use handling for a MemberExpr.
17047 void Sema::MarkMemberReferenced(MemberExpr *E) {
17048 // C++11 [basic.def.odr]p2:
17049 // A non-overloaded function whose name appears as a potentially-evaluated
17050 // expression or a member of a set of candidate functions, if selected by
17051 // overload resolution when referred to from a potentially-evaluated
17052 // expression, is odr-used, unless it is a pure virtual function and its
17053 // name is not explicitly qualified.
17054 bool MightBeOdrUse = true;
17055 if (E->performsVirtualDispatch(getLangOpts())) {
17056 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getMemberDecl()))
17057 if (Method->isPure())
17058 MightBeOdrUse = false;
17059 }
17060 SourceLocation Loc =
17061 E->getMemberLoc().isValid() ? E->getMemberLoc() : E->getBeginLoc();
17062 MarkExprReferenced(*this, Loc, E->getMemberDecl(), E, MightBeOdrUse);
17063 }
17064
17065 /// Perform reference-marking and odr-use handling for a FunctionParmPackExpr.
17066 void Sema::MarkFunctionParmPackReferenced(FunctionParmPackExpr *E) {
17067 for (VarDecl *VD : *E)
17068 MarkExprReferenced(*this, E->getParameterPackLocation(), VD, E, true);
17069 }
17070
17071 /// Perform marking for a reference to an arbitrary declaration. It
17072 /// marks the declaration referenced, and performs odr-use checking for
17073 /// functions and variables. This method should not be used when building a
17074 /// normal expression which refers to a variable.
17075 void Sema::MarkAnyDeclReferenced(SourceLocation Loc, Decl *D,
17076 bool MightBeOdrUse) {
17077 if (MightBeOdrUse) {
17078 if (auto *VD = dyn_cast<VarDecl>(D)) {
17079 MarkVariableReferenced(Loc, VD);
17080 return;
17081 }
17082 }
17083 if (auto *FD = dyn_cast<FunctionDecl>(D)) {
17084 MarkFunctionReferenced(Loc, FD, MightBeOdrUse);
17085 return;
17086 }
17087 D->setReferenced();
17088 }
17089
17090 namespace {
17091 // Mark all of the declarations used by a type as referenced.
17092 // FIXME: Not fully implemented yet! We need to have a better understanding
17093 // of when we're entering a context we should not recurse into.
17094 // FIXME: This is and EvaluatedExprMarker are more-or-less equivalent to
17095 // TreeTransforms rebuilding the type in a new context. Rather than
17096 // duplicating the TreeTransform logic, we should consider reusing it here.
17097 // Currently that causes problems when rebuilding LambdaExprs.
17098 class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
17099 Sema &S;
17100 SourceLocation Loc;
17101
17102 public:
17103 typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;
17104
17105 MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }
17106
17107 bool TraverseTemplateArgument(const TemplateArgument &Arg);
17108 };
17109 }
17110
17111 bool MarkReferencedDecls::TraverseTemplateArgument(
17112 const TemplateArgument &Arg) {
17113 {
17114 // A non-type template argument is a constant-evaluated context.
17115 EnterExpressionEvaluationContext Evaluated(
17116 S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
17117 if (Arg.getKind() == TemplateArgument::Declaration) {
17118 if (Decl *D = Arg.getAsDecl())
17119 S.MarkAnyDeclReferenced(Loc, D, true);
17120 } else if (Arg.getKind() == TemplateArgument::Expression) {
17121 S.MarkDeclarationsReferencedInExpr(Arg.getAsExpr(), false);
17122 }
17123 }
17124
17125 return Inherited::TraverseTemplateArgument(Arg);
17126 }
17127
17128 void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
17129 MarkReferencedDecls Marker(*this, Loc);
17130 Marker.TraverseType(T);
17131 }
17132
17133 namespace {
17134 /// Helper class that marks all of the declarations referenced by
17135 /// potentially-evaluated subexpressions as "referenced".
17136 class EvaluatedExprMarker : public EvaluatedExprVisitor<EvaluatedExprMarker> {
17137 Sema &S;
17138 bool SkipLocalVariables;
17139
17140 public:
17141 typedef EvaluatedExprVisitor<EvaluatedExprMarker> Inherited;
17142
17143 EvaluatedExprMarker(Sema &S, bool SkipLocalVariables)
17144 : Inherited(S.Context), S(S), SkipLocalVariables(SkipLocalVariables) { }
17145
17146 void VisitDeclRefExpr(DeclRefExpr *E) {
17147 // If we were asked not to visit local variables, don't.
17148 if (SkipLocalVariables) {
17149 if (VarDecl *VD = dyn_cast<VarDecl>(E->getDecl()))
17150 if (VD->hasLocalStorage())
17151 return;
17152 }
17153
17154 S.MarkDeclRefReferenced(E);
17155 }
17156
17157 void VisitMemberExpr(MemberExpr *E) {
17158 S.MarkMemberReferenced(E);
17159 Inherited::VisitMemberExpr(E);
17160 }
17161
17162 void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
17163 S.MarkFunctionReferenced(
17164 E->getBeginLoc(),
17165 const_cast<CXXDestructorDecl *>(E->getTemporary()->getDestructor()));
17166 Visit(E->getSubExpr());
17167 }
17168
17169 void VisitCXXNewExpr(CXXNewExpr *E) {
17170 if (E->getOperatorNew())
17171 S.MarkFunctionReferenced(E->getBeginLoc(), E->getOperatorNew());
17172 if (E->getOperatorDelete())
17173 S.MarkFunctionReferenced(E->getBeginLoc(), E->getOperatorDelete());
17174 Inherited::VisitCXXNewExpr(E);
17175 }
17176
17177 void VisitCXXDeleteExpr(CXXDeleteExpr *E) {
17178 if (E->getOperatorDelete())
17179 S.MarkFunctionReferenced(E->getBeginLoc(), E->getOperatorDelete());
17180 QualType Destroyed = S.Context.getBaseElementType(E->getDestroyedType());
17181 if (const RecordType *DestroyedRec = Destroyed->getAs<RecordType>()) {
17182 CXXRecordDecl *Record = cast<CXXRecordDecl>(DestroyedRec->getDecl());
17183 S.MarkFunctionReferenced(E->getBeginLoc(), S.LookupDestructor(Record));
17184 }
17185
17186 Inherited::VisitCXXDeleteExpr(E);
17187 }
17188
17189 void VisitCXXConstructExpr(CXXConstructExpr *E) {
17190 S.MarkFunctionReferenced(E->getBeginLoc(), E->getConstructor());
17191 Inherited::VisitCXXConstructExpr(E);
17192 }
17193
17194 void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
17195 Visit(E->getExpr());
17196 }
17197 };
17198 }
17199
17200 /// Mark any declarations that appear within this expression or any
17201 /// potentially-evaluated subexpressions as "referenced".
17202 ///
17203 /// \param SkipLocalVariables If true, don't mark local variables as
17204 /// 'referenced'.
17205 void Sema::MarkDeclarationsReferencedInExpr(Expr *E,
17206 bool SkipLocalVariables) {
17207 EvaluatedExprMarker(*this, SkipLocalVariables).Visit(E);
17208 }
17209
17210 /// Emit a diagnostic that describes an effect on the run-time behavior
17211 /// of the program being compiled.
17212 ///
17213 /// This routine emits the given diagnostic when the code currently being
17214 /// type-checked is "potentially evaluated", meaning that there is a
17215 /// possibility that the code will actually be executable. Code in sizeof()
17216 /// expressions, code used only during overload resolution, etc., are not
17217 /// potentially evaluated. This routine will suppress such diagnostics or,
17218 /// in the absolutely nutty case of potentially potentially evaluated
17219 /// expressions (C++ typeid), queue the diagnostic to potentially emit it
17220 /// later.
17221 ///
17222 /// This routine should be used for all diagnostics that describe the run-time
17223 /// behavior of a program, such as passing a non-POD value through an ellipsis.
17224 /// Failure to do so will likely result in spurious diagnostics or failures
17225 /// during overload resolution or within sizeof/alignof/typeof/typeid.
17226 bool Sema::DiagRuntimeBehavior(SourceLocation Loc, ArrayRef<const Stmt*> Stmts,
17227 const PartialDiagnostic &PD) {
17228 switch (ExprEvalContexts.back().Context) {
17229 case ExpressionEvaluationContext::Unevaluated:
17230 case ExpressionEvaluationContext::UnevaluatedList:
17231 case ExpressionEvaluationContext::UnevaluatedAbstract:
17232 case ExpressionEvaluationContext::DiscardedStatement:
17233 // The argument will never be evaluated, so don't complain.
17234 break;
17235
17236 case ExpressionEvaluationContext::ConstantEvaluated:
17237 // Relevant diagnostics should be produced by constant evaluation.
17238 break;
17239
17240 case ExpressionEvaluationContext::PotentiallyEvaluated:
17241 case ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed:
17242 if (!Stmts.empty() && getCurFunctionOrMethodDecl()) {
17243 FunctionScopes.back()->PossiblyUnreachableDiags.
17244 push_back(sema::PossiblyUnreachableDiag(PD, Loc, Stmts));
17245 return true;
17246 }
17247
17248 // The initializer of a constexpr variable or of the first declaration of a
17249 // static data member is not syntactically a constant evaluated constant,
17250 // but nonetheless is always required to be a constant expression, so we
17251 // can skip diagnosing.
17252 // FIXME: Using the mangling context here is a hack.
17253 if (auto *VD = dyn_cast_or_null<VarDecl>(
17254 ExprEvalContexts.back().ManglingContextDecl)) {
17255 if (VD->isConstexpr() ||
17256 (VD->isStaticDataMember() && VD->isFirstDecl() && !VD->isInline()))
17257 break;
17258 // FIXME: For any other kind of variable, we should build a CFG for its
17259 // initializer and check whether the context in question is reachable.
17260 }
17261
17262 Diag(Loc, PD);
17263 return true;
17264 }
17265
17266 return false;
17267 }
17268
17269 bool Sema::DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement,
17270 const PartialDiagnostic &PD) {
17271 return DiagRuntimeBehavior(
17272 Loc, Statement ? llvm::makeArrayRef(Statement) : llvm::None, PD);
17273 }
17274
17275 bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
17276 CallExpr *CE, FunctionDecl *FD) {
17277 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
17278 return false;
17279
17280 // If we're inside a decltype's expression, don't check for a valid return
17281 // type or construct temporaries until we know whether this is the last call.
17282 if (ExprEvalContexts.back().ExprContext ==
17283 ExpressionEvaluationContextRecord::EK_Decltype) {
17284 ExprEvalContexts.back().DelayedDecltypeCalls.push_back(CE);
17285 return false;
17286 }
17287
17288 class CallReturnIncompleteDiagnoser : public TypeDiagnoser {
17289 FunctionDecl *FD;
17290 CallExpr *CE;
17291
17292 public:
17293 CallReturnIncompleteDiagnoser(FunctionDecl *FD, CallExpr *CE)
17294 : FD(FD), CE(CE) { }
17295
17296 void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
17297 if (!FD) {
17298 S.Diag(Loc, diag::err_call_incomplete_return)
17299 << T << CE->getSourceRange();
17300 return;
17301 }
17302
17303 S.Diag(Loc, diag::err_call_function_incomplete_return)
17304 << CE->getSourceRange() << FD->getDeclName() << T;
17305 S.Diag(FD->getLocation(), diag::note_entity_declared_at)
17306 << FD->getDeclName();
17307 }
17308 } Diagnoser(FD, CE);
17309
17310 if (RequireCompleteType(Loc, ReturnType, Diagnoser))
17311 return true;
17312
17313 return false;
17314 }
17315
17316 // Diagnose the s/=/==/ and s/\|=/!=/ typos. Note that adding parentheses
17317 // will prevent this condition from triggering, which is what we want.
17318 void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
17319 SourceLocation Loc;
17320
17321 unsigned diagnostic = diag::warn_condition_is_assignment;
17322 bool IsOrAssign = false;
17323
17324 if (BinaryOperator *Op = dyn_cast<BinaryOperator>(E)) {
17325 if (Op->getOpcode() != BO_Assign && Op->getOpcode() != BO_OrAssign)
17326 return;
17327
17328 IsOrAssign = Op->getOpcode() == BO_OrAssign;
17329
17330 // Greylist some idioms by putting them into a warning subcategory.
17331 if (ObjCMessageExpr *ME
17332 = dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
17333 Selector Sel = ME->getSelector();
17334
17335 // self = [<foo> init...]
17336 if (isSelfExpr(Op->getLHS()) && ME->getMethodFamily() == OMF_init)
17337 diagnostic = diag::warn_condition_is_idiomatic_assignment;
17338
17339 // <foo> = [<bar> nextObject]
17340 else if (Sel.isUnarySelector() && Sel.getNameForSlot(0) == "nextObject")
17341 diagnostic = diag::warn_condition_is_idiomatic_assignment;
17342 }
17343
17344 Loc = Op->getOperatorLoc();
17345 } else if (CXXOperatorCallExpr *Op = dyn_cast<CXXOperatorCallExpr>(E)) {
17346 if (Op->getOperator() != OO_Equal && Op->getOperator() != OO_PipeEqual)
17347 return;
17348
17349 IsOrAssign = Op->getOperator() == OO_PipeEqual;
17350 Loc = Op->getOperatorLoc();
17351 } else if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E))
17352 return DiagnoseAssignmentAsCondition(POE->getSyntacticForm());
17353 else {
17354 // Not an assignment.
17355 return;
17356 }
17357
17358 Diag(Loc, diagnostic) << E->getSourceRange();
17359
17360 SourceLocation Open = E->getBeginLoc();
17361 SourceLocation Close = getLocForEndOfToken(E->getSourceRange().getEnd());
17362 Diag(Loc, diag::note_condition_assign_silence)
17363 << FixItHint::CreateInsertion(Open, "(")
17364 << FixItHint::CreateInsertion(Close, ")");
17365
17366 if (IsOrAssign)
17367 Diag(Loc, diag::note_condition_or_assign_to_comparison)
17368 << FixItHint::CreateReplacement(Loc, "!=");
17369 else
17370 Diag(Loc, diag::note_condition_assign_to_comparison)
17371 << FixItHint::CreateReplacement(Loc, "==");
17372 }
17373
17374 /// Redundant parentheses over an equality comparison can indicate
17375 /// that the user intended an assignment used as condition.
17376 void Sema::DiagnoseEqualityWithExtraParens(ParenExpr *ParenE) {
17377 // Don't warn if the parens came from a macro.
17378 SourceLocation parenLoc = ParenE->getBeginLoc();
17379 if (parenLoc.isInvalid() || parenLoc.isMacroID())
17380 return;
17381 // Don't warn for dependent expressions.
17382 if (ParenE->isTypeDependent())
17383 return;
17384
17385 Expr *E = ParenE->IgnoreParens();
17386
17387 if (BinaryOperator *opE = dyn_cast<BinaryOperator>(E))
17388 if (opE->getOpcode() == BO_EQ &&
17389 opE->getLHS()->IgnoreParenImpCasts()->isModifiableLvalue(Context)
17390 == Expr::MLV_Valid) {
17391 SourceLocation Loc = opE->getOperatorLoc();
17392
17393 Diag(Loc, diag::warn_equality_with_extra_parens) << E->getSourceRange();
17394 SourceRange ParenERange = ParenE->getSourceRange();
17395 Diag(Loc, diag::note_equality_comparison_silence)
17396 << FixItHint::CreateRemoval(ParenERange.getBegin())
17397 << FixItHint::CreateRemoval(ParenERange.getEnd());
17398 Diag(Loc, diag::note_equality_comparison_to_assign)
17399 << FixItHint::CreateReplacement(Loc, "=");
17400 }
17401 }
17402
17403 ExprResult Sema::CheckBooleanCondition(SourceLocation Loc, Expr *E,
17404 bool IsConstexpr) {
17405 DiagnoseAssignmentAsCondition(E);
17406 if (ParenExpr *parenE = dyn_cast<ParenExpr>(E))
17407 DiagnoseEqualityWithExtraParens(parenE);
17408
17409 ExprResult result = CheckPlaceholderExpr(E);
17410 if (result.isInvalid()) return ExprError();
17411 E = result.get();
17412
17413 if (!E->isTypeDependent()) {
17414 if (getLangOpts().CPlusPlus)
17415 return CheckCXXBooleanCondition(E, IsConstexpr); // C++ 6.4p4
17416
17417 ExprResult ERes = DefaultFunctionArrayLvalueConversion(E);
17418 if (ERes.isInvalid())
17419 return ExprError();
17420 E = ERes.get();
17421
17422 QualType T = E->getType();
17423 if (!T->isScalarType()) { // C99 6.8.4.1p1
17424 Diag(Loc, diag::err_typecheck_statement_requires_scalar)
17425 << T << E->getSourceRange();
17426 return ExprError();
17427 }
17428 CheckBoolLikeConversion(E, Loc);
17429 }
17430
17431 return E;
17432 }
17433
17434 Sema::ConditionResult Sema::ActOnCondition(Scope *S, SourceLocation Loc,
17435 Expr *SubExpr, ConditionKind CK) {
17436 // Empty conditions are valid in for-statements.
17437 if (!SubExpr)
17438 return ConditionResult();
17439
17440 ExprResult Cond;
17441 switch (CK) {
17442 case ConditionKind::Boolean:
17443 Cond = CheckBooleanCondition(Loc, SubExpr);
17444 break;
17445
17446 case ConditionKind::ConstexprIf:
17447 Cond = CheckBooleanCondition(Loc, SubExpr, true);
17448 break;
17449
17450 case ConditionKind::Switch:
17451 Cond = CheckSwitchCondition(Loc, SubExpr);
17452 break;
17453 }
17454 if (Cond.isInvalid())
17455 return ConditionError();
17456
17457 // FIXME: FullExprArg doesn't have an invalid bit, so check nullness instead.
17458 FullExprArg FullExpr = MakeFullExpr(Cond.get(), Loc);
17459 if (!FullExpr.get())
17460 return ConditionError();
17461
17462 return ConditionResult(*this, nullptr, FullExpr,
17463 CK == ConditionKind::ConstexprIf);
17464 }
17465
17466 namespace {
17467 /// A visitor for rebuilding a call to an __unknown_any expression
17468 /// to have an appropriate type.
17469 struct RebuildUnknownAnyFunction
17470 : StmtVisitor<RebuildUnknownAnyFunction, ExprResult> {
17471
17472 Sema &S;
17473
17474 RebuildUnknownAnyFunction(Sema &S) : S(S) {}
17475
17476 ExprResult VisitStmt(Stmt *S) {
17477 llvm_unreachable("unexpected statement!");
17478 }
17479
17480 ExprResult VisitExpr(Expr *E) {
17481 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_call)
17482 << E->getSourceRange();
17483 return ExprError();
17484 }
17485
17486 /// Rebuild an expression which simply semantically wraps another
17487 /// expression which it shares the type and value kind of.
17488 template <class T> ExprResult rebuildSugarExpr(T *E) {
17489 ExprResult SubResult = Visit(E->getSubExpr());
17490 if (SubResult.isInvalid()) return ExprError();
17491
17492 Expr *SubExpr = SubResult.get();
17493 E->setSubExpr(SubExpr);
17494 E->setType(SubExpr->getType());
17495 E->setValueKind(SubExpr->getValueKind());
17496 assert(E->getObjectKind() == OK_Ordinary);
17497 return E;
17498 }
17499
17500 ExprResult VisitParenExpr(ParenExpr *E) {
17501 return rebuildSugarExpr(E);
17502 }
17503
17504 ExprResult VisitUnaryExtension(UnaryOperator *E) {
17505 return rebuildSugarExpr(E);
17506 }
17507
17508 ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
17509 ExprResult SubResult = Visit(E->getSubExpr());
17510 if (SubResult.isInvalid()) return ExprError();
17511
17512 Expr *SubExpr = SubResult.get();
17513 E->setSubExpr(SubExpr);
17514 E->setType(S.Context.getPointerType(SubExpr->getType()));
17515 assert(E->getValueKind() == VK_RValue);
17516 assert(E->getObjectKind() == OK_Ordinary);
17517 return E;
17518 }
17519
17520 ExprResult resolveDecl(Expr *E, ValueDecl *VD) {
17521 if (!isa<FunctionDecl>(VD)) return VisitExpr(E);
17522
17523 E->setType(VD->getType());
17524
17525 assert(E->getValueKind() == VK_RValue);
17526 if (S.getLangOpts().CPlusPlus &&
17527 !(isa<CXXMethodDecl>(VD) &&
17528 cast<CXXMethodDecl>(VD)->isInstance()))
17529 E->setValueKind(VK_LValue);
17530
17531 return E;
17532 }
17533
17534 ExprResult VisitMemberExpr(MemberExpr *E) {
17535 return resolveDecl(E, E->getMemberDecl());
17536 }
17537
17538 ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
17539 return resolveDecl(E, E->getDecl());
17540 }
17541 };
17542 }
17543
17544 /// Given a function expression of unknown-any type, try to rebuild it
17545 /// to have a function type.
17546 static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *FunctionExpr) {
17547 ExprResult Result = RebuildUnknownAnyFunction(S).Visit(FunctionExpr);
17548 if (Result.isInvalid()) return ExprError();
17549 return S.DefaultFunctionArrayConversion(Result.get());
17550 }
17551
17552 namespace {
17553 /// A visitor for rebuilding an expression of type __unknown_anytype
17554 /// into one which resolves the type directly on the referring
17555 /// expression. Strict preservation of the original source
17556 /// structure is not a goal.
17557 struct RebuildUnknownAnyExpr
17558 : StmtVisitor<RebuildUnknownAnyExpr, ExprResult> {
17559
17560 Sema &S;
17561
17562 /// The current destination type.
17563 QualType DestType;
17564
17565 RebuildUnknownAnyExpr(Sema &S, QualType CastType)
17566 : S(S), DestType(CastType) {}
17567
17568 ExprResult VisitStmt(Stmt *S) {
17569 llvm_unreachable("unexpected statement!");
17570 }
17571
17572 ExprResult VisitExpr(Expr *E) {
17573 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
17574 << E->getSourceRange();
17575 return ExprError();
17576 }
17577
17578 ExprResult VisitCallExpr(CallExpr *E);
17579 ExprResult VisitObjCMessageExpr(ObjCMessageExpr *E);
17580
17581 /// Rebuild an expression which simply semantically wraps another
17582 /// expression which it shares the type and value kind of.
17583 template <class T> ExprResult rebuildSugarExpr(T *E) {
17584 ExprResult SubResult = Visit(E->getSubExpr());
17585 if (SubResult.isInvalid()) return ExprError();
17586 Expr *SubExpr = SubResult.get();
17587 E->setSubExpr(SubExpr);
17588 E->setType(SubExpr->getType());
17589 E->setValueKind(SubExpr->getValueKind());
17590 assert(E->getObjectKind() == OK_Ordinary);
17591 return E;
17592 }
17593
17594 ExprResult VisitParenExpr(ParenExpr *E) {
17595 return rebuildSugarExpr(E);
17596 }
17597
17598 ExprResult VisitUnaryExtension(UnaryOperator *E) {
17599 return rebuildSugarExpr(E);
17600 }
17601
17602 ExprResult VisitUnaryAddrOf(UnaryOperator *E) {
17603 const PointerType *Ptr = DestType->getAs<PointerType>();
17604 if (!Ptr) {
17605 S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof)
17606 << E->getSourceRange();
17607 return ExprError();
17608 }
17609
17610 if (isa<CallExpr>(E->getSubExpr())) {
17611 S.Diag(E->getOperatorLoc(), diag::err_unknown_any_addrof_call)
17612 << E->getSourceRange();
17613 return ExprError();
17614 }
17615
17616 assert(E->getValueKind() == VK_RValue);
17617 assert(E->getObjectKind() == OK_Ordinary);
17618 E->setType(DestType);
17619
17620 // Build the sub-expression as if it were an object of the pointee type.
17621 DestType = Ptr->getPointeeType();
17622 ExprResult SubResult = Visit(E->getSubExpr());
17623 if (SubResult.isInvalid()) return ExprError();
17624 E->setSubExpr(SubResult.get());
17625 return E;
17626 }
17627
17628 ExprResult VisitImplicitCastExpr(ImplicitCastExpr *E);
17629
17630 ExprResult resolveDecl(Expr *E, ValueDecl *VD);
17631
17632 ExprResult VisitMemberExpr(MemberExpr *E) {
17633 return resolveDecl(E, E->getMemberDecl());
17634 }
17635
17636 ExprResult VisitDeclRefExpr(DeclRefExpr *E) {
17637 return resolveDecl(E, E->getDecl());
17638 }
17639 };
17640 }
17641
17642 /// Rebuilds a call expression which yielded __unknown_anytype.
17643 ExprResult RebuildUnknownAnyExpr::VisitCallExpr(CallExpr *E) {
17644 Expr *CalleeExpr = E->getCallee();
17645
17646 enum FnKind {
17647 FK_MemberFunction,
17648 FK_FunctionPointer,
17649 FK_BlockPointer
17650 };
17651
17652 FnKind Kind;
17653 QualType CalleeType = CalleeExpr->getType();
17654 if (CalleeType == S.Context.BoundMemberTy) {
17655 assert(isa<CXXMemberCallExpr>(E) || isa<CXXOperatorCallExpr>(E));
17656 Kind = FK_MemberFunction;
17657 CalleeType = Expr::findBoundMemberType(CalleeExpr);
17658 } else if (const PointerType *Ptr = CalleeType->getAs<PointerType>()) {
17659 CalleeType = Ptr->getPointeeType();
17660 Kind = FK_FunctionPointer;
17661 } else {
17662 CalleeType = CalleeType->castAs<BlockPointerType>()->getPointeeType();
17663 Kind = FK_BlockPointer;
17664 }
17665 const FunctionType *FnType = CalleeType->castAs<FunctionType>();
17666
17667 // Verify that this is a legal result type of a function.
17668 if (DestType->isArrayType() || DestType->isFunctionType()) {
17669 unsigned diagID = diag::err_func_returning_array_function;
17670 if (Kind == FK_BlockPointer)
17671 diagID = diag::err_block_returning_array_function;
17672
17673 S.Diag(E->getExprLoc(), diagID)
17674 << DestType->isFunctionType() << DestType;
17675 return ExprError();
17676 }
17677
17678 // Otherwise, go ahead and set DestType as the call's result.
17679 E->setType(DestType.getNonLValueExprType(S.Context));
17680 E->setValueKind(Expr::getValueKindForType(DestType));
17681 assert(E->getObjectKind() == OK_Ordinary);
17682
17683 // Rebuild the function type, replacing the result type with DestType.
17684 const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FnType);
17685 if (Proto) {
17686 // __unknown_anytype(...) is a special case used by the debugger when
17687 // it has no idea what a function's signature is.
17688 //
17689 // We want to build this call essentially under the K&R
17690 // unprototyped rules, but making a FunctionNoProtoType in C++
17691 // would foul up all sorts of assumptions. However, we cannot
17692 // simply pass all arguments as variadic arguments, nor can we
17693 // portably just call the function under a non-variadic type; see
17694 // the comment on IR-gen's TargetInfo::isNoProtoCallVariadic.
17695 // However, it turns out that in practice it is generally safe to
17696 // call a function declared as "A foo(B,C,D);" under the prototype
17697 // "A foo(B,C,D,...);". The only known exception is with the
17698 // Windows ABI, where any variadic function is implicitly cdecl
17699 // regardless of its normal CC. Therefore we change the parameter
17700 // types to match the types of the arguments.
17701 //
17702 // This is a hack, but it is far superior to moving the
17703 // corresponding target-specific code from IR-gen to Sema/AST.
17704
17705 ArrayRef<QualType> ParamTypes = Proto->getParamTypes();
17706 SmallVector<QualType, 8> ArgTypes;
17707 if (ParamTypes.empty() && Proto->isVariadic()) { // the special case
17708 ArgTypes.reserve(E->getNumArgs());
17709 for (unsigned i = 0, e = E->getNumArgs(); i != e; ++i) {
17710 Expr *Arg = E->getArg(i);
17711 QualType ArgType = Arg->getType();
17712 if (E->isLValue()) {
17713 ArgType = S.Context.getLValueReferenceType(ArgType);
17714 } else if (E->isXValue()) {
17715 ArgType = S.Context.getRValueReferenceType(ArgType);
17716 }
17717 ArgTypes.push_back(ArgType);
17718 }
17719 ParamTypes = ArgTypes;
17720 }
17721 DestType = S.Context.getFunctionType(DestType, ParamTypes,
17722 Proto->getExtProtoInfo());
17723 } else {
17724 DestType = S.Context.getFunctionNoProtoType(DestType,
17725 FnType->getExtInfo());
17726 }
17727
17728 // Rebuild the appropriate pointer-to-function type.
17729 switch (Kind) {
17730 case FK_MemberFunction:
17731 // Nothing to do.
17732 break;
17733
17734 case FK_FunctionPointer:
17735 DestType = S.Context.getPointerType(DestType);
17736 break;
17737
17738 case FK_BlockPointer:
17739 DestType = S.Context.getBlockPointerType(DestType);
17740 break;
17741 }
17742
17743 // Finally, we can recurse.
17744 ExprResult CalleeResult = Visit(CalleeExpr);
17745 if (!CalleeResult.isUsable()) return ExprError();
17746 E->setCallee(CalleeResult.get());
17747
17748 // Bind a temporary if necessary.
17749 return S.MaybeBindToTemporary(E);
17750 }
17751
17752 ExprResult RebuildUnknownAnyExpr::VisitObjCMessageExpr(ObjCMessageExpr *E) {
17753 // Verify that this is a legal result type of a call.
17754 if (DestType->isArrayType() || DestType->isFunctionType()) {
17755 S.Diag(E->getExprLoc(), diag::err_func_returning_array_function)
17756 << DestType->isFunctionType() << DestType;
17757 return ExprError();
17758 }
17759
17760 // Rewrite the method result type if available.
17761 if (ObjCMethodDecl *Method = E->getMethodDecl()) {
17762 assert(Method->getReturnType() == S.Context.UnknownAnyTy);
17763 Method->setReturnType(DestType);
17764 }
17765
17766 // Change the type of the message.
17767 E->setType(DestType.getNonReferenceType());
17768 E->setValueKind(Expr::getValueKindForType(DestType));
17769
17770 return S.MaybeBindToTemporary(E);
17771 }
17772
17773 ExprResult RebuildUnknownAnyExpr::VisitImplicitCastExpr(ImplicitCastExpr *E) {
17774 // The only case we should ever see here is a function-to-pointer decay.
17775 if (E->getCastKind() == CK_FunctionToPointerDecay) {
17776 assert(E->getValueKind() == VK_RValue);
17777 assert(E->getObjectKind() == OK_Ordinary);
17778
17779 E->setType(DestType);
17780
17781 // Rebuild the sub-expression as the pointee (function) type.
17782 DestType = DestType->castAs<PointerType>()->getPointeeType();
17783
17784 ExprResult Result = Visit(E->getSubExpr());
17785 if (!Result.isUsable()) return ExprError();
17786
17787 E->setSubExpr(Result.get());
17788 return E;
17789 } else if (E->getCastKind() == CK_LValueToRValue) {
17790 assert(E->getValueKind() == VK_RValue);
17791 assert(E->getObjectKind() == OK_Ordinary);
17792
17793 assert(isa<BlockPointerType>(E->getType()));
17794
17795 E->setType(DestType);
17796
17797 // The sub-expression has to be a lvalue reference, so rebuild it as such.
17798 DestType = S.Context.getLValueReferenceType(DestType);
17799
17800 ExprResult Result = Visit(E->getSubExpr());
17801 if (!Result.isUsable()) return ExprError();
17802
17803 E->setSubExpr(Result.get());
17804 return E;
17805 } else {
17806 llvm_unreachable("Unhandled cast type!");
17807 }
17808 }
17809
17810 ExprResult RebuildUnknownAnyExpr::resolveDecl(Expr *E, ValueDecl *VD) {
17811 ExprValueKind ValueKind = VK_LValue;
17812 QualType Type = DestType;
17813
17814 // We know how to make this work for certain kinds of decls:
17815
17816 // - functions
17817 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(VD)) {
17818 if (const PointerType *Ptr = Type->getAs<PointerType>()) {
17819 DestType = Ptr->getPointeeType();
17820 ExprResult Result = resolveDecl(E, VD);
17821 if (Result.isInvalid()) return ExprError();
17822 return S.ImpCastExprToType(Result.get(), Type,
17823 CK_FunctionToPointerDecay, VK_RValue);
17824 }
17825
17826 if (!Type->isFunctionType()) {
17827 S.Diag(E->getExprLoc(), diag::err_unknown_any_function)
17828 << VD << E->getSourceRange();
17829 return ExprError();
17830 }
17831 if (const FunctionProtoType *FT = Type->getAs<FunctionProtoType>()) {
17832 // We must match the FunctionDecl's type to the hack introduced in
17833 // RebuildUnknownAnyExpr::VisitCallExpr to vararg functions of unknown
17834 // type. See the lengthy commentary in that routine.
17835 QualType FDT = FD->getType();
17836 const FunctionType *FnType = FDT->castAs<FunctionType>();
17837 const FunctionProtoType *Proto = dyn_cast_or_null<FunctionProtoType>(FnType);
17838 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
17839 if (DRE && Proto && Proto->getParamTypes().empty() && Proto->isVariadic()) {
17840 SourceLocation Loc = FD->getLocation();
17841 FunctionDecl *NewFD = FunctionDecl::Create(
17842 S.Context, FD->getDeclContext(), Loc, Loc,
17843 FD->getNameInfo().getName(), DestType, FD->getTypeSourceInfo(),
17844 SC_None, false /*isInlineSpecified*/, FD->hasPrototype(),
17845 /*ConstexprKind*/ CSK_unspecified);
17846
17847 if (FD->getQualifier())
17848 NewFD->setQualifierInfo(FD->getQualifierLoc());
17849
17850 SmallVector<ParmVarDecl*, 16> Params;
17851 for (const auto &AI : FT->param_types()) {
17852 ParmVarDecl *Param =
17853 S.BuildParmVarDeclForTypedef(FD, Loc, AI);
17854 Param->setScopeInfo(0, Params.size());
17855 Params.push_back(Param);
17856 }
17857 NewFD->setParams(Params);
17858 DRE->setDecl(NewFD);
17859 VD = DRE->getDecl();
17860 }
17861 }
17862
17863 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
17864 if (MD->isInstance()) {
17865 ValueKind = VK_RValue;
17866 Type = S.Context.BoundMemberTy;
17867 }
17868
17869 // Function references aren't l-values in C.
17870 if (!S.getLangOpts().CPlusPlus)
17871 ValueKind = VK_RValue;
17872
17873 // - variables
17874 } else if (isa<VarDecl>(VD)) {
17875 if (const ReferenceType *RefTy = Type->getAs<ReferenceType>()) {
17876 Type = RefTy->getPointeeType();
17877 } else if (Type->isFunctionType()) {
17878 S.Diag(E->getExprLoc(), diag::err_unknown_any_var_function_type)
17879 << VD << E->getSourceRange();
17880 return ExprError();
17881 }
17882
17883 // - nothing else
17884 } else {
17885 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_decl)
17886 << VD << E->getSourceRange();
17887 return ExprError();
17888 }
17889
17890 // Modifying the declaration like this is friendly to IR-gen but
17891 // also really dangerous.
17892 VD->setType(DestType);
17893 E->setType(Type);
17894 E->setValueKind(ValueKind);
17895 return E;
17896 }
17897
17898 /// Check a cast of an unknown-any type. We intentionally only
17899 /// trigger this for C-style casts.
17900 ExprResult Sema::checkUnknownAnyCast(SourceRange TypeRange, QualType CastType,
17901 Expr *CastExpr, CastKind &CastKind,
17902 ExprValueKind &VK, CXXCastPath &Path) {
17903 // The type we're casting to must be either void or complete.
17904 if (!CastType->isVoidType() &&
17905 RequireCompleteType(TypeRange.getBegin(), CastType,
17906 diag::err_typecheck_cast_to_incomplete))
17907 return ExprError();
17908
17909 // Rewrite the casted expression from scratch.
17910 ExprResult result = RebuildUnknownAnyExpr(*this, CastType).Visit(CastExpr);
17911 if (!result.isUsable()) return ExprError();
17912
17913 CastExpr = result.get();
17914 VK = CastExpr->getValueKind();
17915 CastKind = CK_NoOp;
17916
17917 return CastExpr;
17918 }
17919
17920 ExprResult Sema::forceUnknownAnyToType(Expr *E, QualType ToType) {
17921 return RebuildUnknownAnyExpr(*this, ToType).Visit(E);
17922 }
17923
17924 ExprResult Sema::checkUnknownAnyArg(SourceLocation callLoc,
17925 Expr *arg, QualType &paramType) {
17926 // If the syntactic form of the argument is not an explicit cast of
17927 // any sort, just do default argument promotion.
17928 ExplicitCastExpr *castArg = dyn_cast<ExplicitCastExpr>(arg->IgnoreParens());
17929 if (!castArg) {
17930 ExprResult result = DefaultArgumentPromotion(arg);
17931 if (result.isInvalid()) return ExprError();
17932 paramType = result.get()->getType();
17933 return result;
17934 }
17935
17936 // Otherwise, use the type that was written in the explicit cast.
17937 assert(!arg->hasPlaceholderType());
17938 paramType = castArg->getTypeAsWritten();
17939
17940 // Copy-initialize a parameter of that type.
17941 InitializedEntity entity =
17942 InitializedEntity::InitializeParameter(Context, paramType,
17943 /*consumed*/ false);
17944 return PerformCopyInitialization(entity, callLoc, arg);
17945 }
17946
17947 static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *E) {
17948 Expr *orig = E;
17949 unsigned diagID = diag::err_uncasted_use_of_unknown_any;
17950 while (true) {
17951 E = E->IgnoreParenImpCasts();
17952 if (CallExpr *call = dyn_cast<CallExpr>(E)) {
17953 E = call->getCallee();
17954 diagID = diag::err_uncasted_call_of_unknown_any;
17955 } else {
17956 break;
17957 }
17958 }
17959
17960 SourceLocation loc;
17961 NamedDecl *d;
17962 if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(E)) {
17963 loc = ref->getLocation();
17964 d = ref->getDecl();
17965 } else if (MemberExpr *mem = dyn_cast<MemberExpr>(E)) {
17966 loc = mem->getMemberLoc();
17967 d = mem->getMemberDecl();
17968 } else if (ObjCMessageExpr *msg = dyn_cast<ObjCMessageExpr>(E)) {
17969 diagID = diag::err_uncasted_call_of_unknown_any;
17970 loc = msg->getSelectorStartLoc();
17971 d = msg->getMethodDecl();
17972 if (!d) {
17973 S.Diag(loc, diag::err_uncasted_send_to_unknown_any_method)
17974 << static_cast<unsigned>(msg->isClassMessage()) << msg->getSelector()
17975 << orig->getSourceRange();
17976 return ExprError();
17977 }
17978 } else {
17979 S.Diag(E->getExprLoc(), diag::err_unsupported_unknown_any_expr)
17980 << E->getSourceRange();
17981 return ExprError();
17982 }
17983
17984 S.Diag(loc, diagID) << d << orig->getSourceRange();
17985
17986 // Never recoverable.
17987 return ExprError();
17988 }
17989
17990 /// Check for operands with placeholder types and complain if found.
17991 /// Returns ExprError() if there was an error and no recovery was possible.
17992 ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
17993 if (!getLangOpts().CPlusPlus) {
17994 // C cannot handle TypoExpr nodes on either side of a binop because it
17995 // doesn't handle dependent types properly, so make sure any TypoExprs have
17996 // been dealt with before checking the operands.
17997 ExprResult Result = CorrectDelayedTyposInExpr(E);
17998 if (!Result.isUsable()) return ExprError();
17999 E = Result.get();
18000 }
18001
18002 const BuiltinType *placeholderType = E->getType()->getAsPlaceholderType();
18003 if (!placeholderType) return E;
18004
18005 switch (placeholderType->getKind()) {
18006
18007 // Overloaded expressions.
18008 case BuiltinType::Overload: {
18009 // Try to resolve a single function template specialization.
18010 // This is obligatory.
18011 ExprResult Result = E;
18012 if (ResolveAndFixSingleFunctionTemplateSpecialization(Result, false))
18013 return Result;
18014
18015 // No guarantees that ResolveAndFixSingleFunctionTemplateSpecialization
18016 // leaves Result unchanged on failure.
18017 Result = E;
18018 if (resolveAndFixAddressOfSingleOverloadCandidate(Result))
18019 return Result;
18020
18021 // If that failed, try to recover with a call.
18022 tryToRecoverWithCall(Result, PDiag(diag::err_ovl_unresolvable),
18023 /*complain*/ true);
18024 return Result;
18025 }
18026
18027 // Bound member functions.
18028 case BuiltinType::BoundMember: {
18029 ExprResult result = E;
18030 const Expr *BME = E->IgnoreParens();
18031 PartialDiagnostic PD = PDiag(diag::err_bound_member_function);
18032 // Try to give a nicer diagnostic if it is a bound member that we recognize.
18033 if (isa<CXXPseudoDestructorExpr>(BME)) {
18034 PD = PDiag(diag::err_dtor_expr_without_call) << /*pseudo-destructor*/ 1;
18035 } else if (const auto *ME = dyn_cast<MemberExpr>(BME)) {
18036 if (ME->getMemberNameInfo().getName().getNameKind() ==
18037 DeclarationName::CXXDestructorName)
18038 PD = PDiag(diag::err_dtor_expr_without_call) << /*destructor*/ 0;
18039 }
18040 tryToRecoverWithCall(result, PD,
18041 /*complain*/ true);
18042 return result;
18043 }
18044
18045 // ARC unbridged casts.
18046 case BuiltinType::ARCUnbridgedCast: {
18047 Expr *realCast = stripARCUnbridgedCast(E);
18048 diagnoseARCUnbridgedCast(realCast);
18049 return realCast;
18050 }
18051
18052 // Expressions of unknown type.
18053 case BuiltinType::UnknownAny:
18054 return diagnoseUnknownAnyExpr(*this, E);
18055
18056 // Pseudo-objects.
18057 case BuiltinType::PseudoObject:
18058 return checkPseudoObjectRValue(E);
18059
18060 case BuiltinType::BuiltinFn: {
18061 // Accept __noop without parens by implicitly converting it to a call expr.
18062 auto *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts());
18063 if (DRE) {
18064 auto *FD = cast<FunctionDecl>(DRE->getDecl());
18065 if (FD->getBuiltinID() == Builtin::BI__noop) {
18066 E = ImpCastExprToType(E, Context.getPointerType(FD->getType()),
18067 CK_BuiltinFnToFnPtr)
18068 .get();
18069 return CallExpr::Create(Context, E, /*Args=*/{}, Context.IntTy,
18070 VK_RValue, SourceLocation());
18071 }
18072 }
18073
18074 Diag(E->getBeginLoc(), diag::err_builtin_fn_use);
18075 return ExprError();
18076 }
18077
18078 // Expressions of unknown type.
18079 case BuiltinType::OMPArraySection:
18080 Diag(E->getBeginLoc(), diag::err_omp_array_section_use);
18081 return ExprError();
18082
18083 // Everything else should be impossible.
18084 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
18085 case BuiltinType::Id:
18086 #include "clang/Basic/OpenCLImageTypes.def"
18087 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
18088 case BuiltinType::Id:
18089 #include "clang/Basic/OpenCLExtensionTypes.def"
18090 #define SVE_TYPE(Name, Id, SingletonId) \
18091 case BuiltinType::Id:
18092 #include "clang/Basic/AArch64SVEACLETypes.def"
18093 #define BUILTIN_TYPE(Id, SingletonId) case BuiltinType::Id:
18094 #define PLACEHOLDER_TYPE(Id, SingletonId)
18095 #include "clang/AST/BuiltinTypes.def"
18096 break;
18097 }
18098
18099 llvm_unreachable("invalid placeholder type!");
18100 }
18101
18102 bool Sema::CheckCaseExpression(Expr *E) {
18103 if (E->isTypeDependent())
18104 return true;
18105 if (E->isValueDependent() || E->isIntegerConstantExpr(Context))
18106 return E->getType()->isIntegralOrEnumerationType();
18107 return false;
18108 }
18109
18110 /// ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
18111 ExprResult
18112 Sema::ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
18113 assert((Kind == tok::kw___objc_yes || Kind == tok::kw___objc_no) &&
18114 "Unknown Objective-C Boolean value!");
18115 QualType BoolT = Context.ObjCBuiltinBoolTy;
18116 if (!Context.getBOOLDecl()) {
18117 LookupResult Result(*this, &Context.Idents.get("BOOL"), OpLoc,
18118 Sema::LookupOrdinaryName);
18119 if (LookupName(Result, getCurScope()) && Result.isSingleResult()) {
18120 NamedDecl *ND = Result.getFoundDecl();
18121 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(ND))
18122 Context.setBOOLDecl(TD);
18123 }
18124 }
18125 if (Context.getBOOLDecl())
18126 BoolT = Context.getBOOLType();
18127 return new (Context)
18128 ObjCBoolLiteralExpr(Kind == tok::kw___objc_yes, BoolT, OpLoc);
18129 }
18130
18131 ExprResult Sema::ActOnObjCAvailabilityCheckExpr(
18132 llvm::ArrayRef<AvailabilitySpec> AvailSpecs, SourceLocation AtLoc,
18133 SourceLocation RParen) {
18134
18135 StringRef Platform = getASTContext().getTargetInfo().getPlatformName();
18136
18137 auto Spec = llvm::find_if(AvailSpecs, [&](const AvailabilitySpec &Spec) {
18138 return Spec.getPlatform() == Platform;
18139 });
18140
18141 VersionTuple Version;
18142 if (Spec != AvailSpecs.end())
18143 Version = Spec->getVersion();
18144
18145 // The use of `@available` in the enclosing function should be analyzed to
18146 // warn when it's used inappropriately (i.e. not if(@available)).
18147 if (getCurFunctionOrMethodDecl())
18148 getEnclosingFunction()->HasPotentialAvailabilityViolations = true;
18149 else if (getCurBlock() || getCurLambda())
18150 getCurFunction()->HasPotentialAvailabilityViolations = true;
18151
18152 return new (Context)
18153 ObjCAvailabilityCheckExpr(Version, AtLoc, RParen, Context.BoolTy);
18154 }
18155
18156 bool Sema::IsDependentFunctionNameExpr(Expr *E) {
18157 assert(E->isTypeDependent());
18158 return isa<UnresolvedLookupExpr>(E);
18159 }
clang::Sema::TypeDiagnoser
Abstract class used to diagnose incomplete types.
Definition: Sema.h:1693
diagnoseArithmeticOnFunctionPointer
static void diagnoseArithmeticOnFunctionPointer(Sema &S, SourceLocation Loc, Expr *Pointer)
Diagnose invalid arithmetic on a function pointer.
Definition: SemaExpr.cpp:9500
clang::CorrectionCandidateCallback::setTypoName
void setTypoName(IdentifierInfo *II)
Definition: TypoCorrection.h:322
clang::OMF_finalize
Definition: IdentifierTable.h:641
clang::CXXOperatorCallExpr
A call to an overloaded operator written using operator syntax.
Definition: ExprCXX.h:78
clang::Expr::LV_IncompleteVoidType
Definition: Expr.h:266
clang::AR_Unavailable
Definition: DeclBase.h:78
clang::Sema::LookupMethodInQualifiedType
ObjCMethodDecl * LookupMethodInQualifiedType(Selector Sel, const ObjCObjectPointerType *OPT, bool IsInstance)
LookupMethodInQualifiedType - Lookups up a method in protocol qualifier list of a qualified objective...
Definition: SemaExprObjC.cpp:1834
clang::DeclarationNameInfo::getLoc
SourceLocation getLoc() const
getLoc - Returns the main location of the declaration name.
Definition: DeclarationName.h:719
ParsedTemplate.h
clang::ObjCObjectPointerType::getInterfaceType
const ObjCInterfaceType * getInterfaceType() const
If this pointer points to an Objective C @interface type, gets the type for that interface.
Definition: Type.cpp:1607
clang::Builtin::ID
ID
Definition: Builtins.h:46
clang::ast_matchers::type
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Definition: ASTMatchersInternal.cpp:644
DiagnoseBitwisePrecedence
static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc, SourceLocation OpLoc, Expr *LHSExpr, Expr *RHSExpr)
DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison operators are mixed in a way t...
Definition: SemaExpr.cpp:13203
ASTContext.h
Defines the clang::ASTContext interface.
clang::ASTContext::getAddrSpaceQualType
QualType getAddrSpaceQualType(QualType T, LangAS AddressSpace) const
Return the uniqued reference to the type for an address space qualified type with the specified type ...
Definition: ASTContext.cpp:2864
clang::BlockExpr::getBlockDecl
const BlockDecl * getBlockDecl() const
Definition: Expr.h:5599
clang::ObjCInterfaceDecl::hasDefinition
bool hasDefinition() const
Determine whether this class has been defined.
Definition: DeclObjC.h:1549
clang::QualType::isNonWeakInMRRWithObjCWeak
bool isNonWeakInMRRWithObjCWeak(const ASTContext &Context) const
Definition: Type.cpp:2326
clang::Sema::MarkDeclarationsReferencedInExpr
void MarkDeclarationsReferencedInExpr(Expr *E, bool SkipLocalVariables=false)
Mark any declarations that appear within this expression or any potentially-evaluated subexpressions ...
Definition: SemaExpr.cpp:17205
clang::Sema::VariadicCallType
VariadicCallType
Definition: Sema.h:10559
clang::ParmVarDecl::setScopeInfo
void setScopeInfo(unsigned scopeDepth, unsigned parameterIndex)
Definition: Decl.h:1628
clang::CharacterLiteral::Ascii
Definition: Expr.h:1533
clang::Sema::getCurrentThisType
QualType getCurrentThisType()
Try to retrieve the type of the &#39;this&#39; pointer.
Definition: SemaExprCXX.cpp:1082
clang::CanQual::withConst
QualType withConst() const
Retrieves a version of this type with const applied.
Definition: CanonicalType.h:161
clang::Sema::ActOnCondition
ConditionResult ActOnCondition(Scope *S, SourceLocation Loc, Expr *SubExpr, ConditionKind CK)
Definition: SemaExpr.cpp:17434
clang::CXXTemporary::getDestructor
const CXXDestructorDecl * getDestructor() const
Definition: ExprCXX.h:1352
clang::ObjCMethodDecl::isClassMethod
bool isClassMethod() const
Definition: DeclObjC.h:431
clang::CC_X86VectorCall
Definition: Specifiers.h:270
isOverflowingIntegerType
static bool isOverflowingIntegerType(ASTContext &Ctx, QualType T)
Definition: SemaExpr.cpp:13566
clang::ASTContext::LongLongTy
CanQualType LongLongTy
Definition: ASTContext.h:1025
clang::Sema::RequireNonAbstractType
bool RequireNonAbstractType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Definition: SemaDeclCXX.cpp:5550
clang::VarDecl::mightBeUsableInConstantExpressions
bool mightBeUsableInConstantExpressions(ASTContext &C) const
Determine whether this variable&#39;s value might be usable in a constant expression, according to the re...
Definition: Decl.cpp:2292
clang::FunctionDecl
Represents a function declaration or definition.
Definition: Decl.h:1783
isVariableAlreadyCapturedInScopeInfo
static bool isVariableAlreadyCapturedInScopeInfo(CapturingScopeInfo *CSI, VarDecl *Var, bool &SubCapturesAreNested, QualType &CaptureType, QualType &DeclRefType)
Definition: SemaExpr.cpp:15833
clang::Type::hasAttr
bool hasAttr(attr::Kind AK) const
Determine whether this type had the specified attribute applied to it (looking through top-level type...
Definition: Type.cpp:1707
clang::Type::isFixedPointType
bool isFixedPointType() const
Return true if this is a fixed point type according to ISO/IEC JTC1 SC22 WG14 N1169.
Definition: Type.h:6824
clang::CallExpr::getArgs
Expr ** getArgs()
Retrieve the call arguments.
Definition: Expr.h:2692
Diag
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
Definition: LiteralSupport.cpp:77
clang::interp::Cast
bool Cast(InterpState &S, CodePtr OpPC)
Definition: Interp.h:800
clang::Sema::ActOnCastExpr
ExprResult ActOnCastExpr(Scope *S, SourceLocation LParenLoc, Declarator &D, ParsedType &Ty, SourceLocation RParenLoc, Expr *CastExpr)
Definition: SemaExpr.cpp:6772
clang::TypoCorrection::getCorrectionRange
SourceRange getCorrectionRange() const
Definition: TypoCorrection.h:226
clang::Builtin::Context::isPredefinedLibFunction
bool isPredefinedLibFunction(unsigned ID) const
Determines whether this builtin is a predefined libc/libm function, such as "malloc", where we know the signature a priori.
Definition: Builtins.h:138
clang::Sema::IncompatibleNestedPointerAddressSpaceMismatch
IncompatibleNestedPointerAddressSpaceMismatch - The assignment changes address spaces in nested point...
Definition: Sema.h:10672
clang::ObjCObjectPointerType::isObjCQualifiedIdType
bool isObjCQualifiedIdType() const
True if this is equivalent to &#39;id.
Definition: Type.h:6030
clang::TargetInfo::hasBuiltinMSVaList
bool hasBuiltinMSVaList() const
Returns whether or not type __builtin_ms_va_list type is available on this target.
Definition: TargetInfo.h:790
clang::LangOptions::isSignedOverflowDefined
bool isSignedOverflowDefined() const
Definition: LangOptions.h:322
clang::ASTContext::AccumTy
CanQualType AccumTy
Definition: ASTContext.h:1029
clang::SourceLocation::getLocWithOffset
SourceLocation getLocWithOffset(int Offset) const
Return a source location with the specified offset from this SourceLocation.
Definition: SourceLocation.h:132
clang::UnqualifiedId::setKind
void setKind(UnqualifiedIdKind kind)
Definition: DeclSpec.h:1043
clang::Sema::ACK_Comparison
A comparison.
Definition: Sema.h:10613
clang::DynamicInitKind::Initializer
clang::Selector
Smart pointer class that efficiently represents Objective-C method names.
Definition: IdentifierTable.h:685
clang::ASTContext::getObjCIdType
QualType getObjCIdType() const
Represents the Objective-CC id type.
Definition: ASTContext.h:1874
clang::Sema::CheckLValueToRValueConversionOperand
ExprResult CheckLValueToRValueConversionOperand(Expr *E)
Definition: SemaExpr.cpp:16759
clang::BlockDecl::Capture
A class which contains all the information about a particular captured value.
Definition: Decl.h:4043
clang::OpaquePtr::get
PtrTy get() const
Definition: Ownership.h:80
clang::Sema::PushExpressionEvaluationContext
void PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext, Decl *LambdaContextDecl=nullptr, ExpressionEvaluationContextRecord::ExpressionKind Type=ExpressionEvaluationContextRecord::EK_Other)
Definition: SemaExpr.cpp:15201
clang::if
if(T->getSizeExpr()) TRY_TO(TraverseStmt(T -> getSizeExpr()))
Definition: RecursiveASTVisitor.h:1045
clang::PointerType
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2614
clang::Type::STK_FixedPoint
Definition: Type.h:2142
OEK_Member
Definition: SemaExpr.cpp:11752
clang::EvaluatedExprVisitor
EvaluatedExprVisitor - This class visits &#39;Expr *&#39;s.
Definition: EvaluatedExprVisitor.h:111
clang::PointerType::getPointeeType
QualType getPointeeType() const
Definition: Type.h:2627
clang::Sema::CheckLoopHintExpr
bool CheckLoopHintExpr(Expr *E, SourceLocation Loc)
Definition: SemaExpr.cpp:3483
clang::QualType
A (possibly-)qualified type.
Definition: Type.h:654
clang::ASTContext::getIntegerTypeOrder
int getIntegerTypeOrder(QualType LHS, QualType RHS) const
Return the highest ranked integer type, see C99 6.3.1.8p1.
Definition: ASTContext.cpp:6081
clang::Type::isBlockPointerType
bool isBlockPointerType() const
Definition: Type.h:6512
checkConditionalPointerCompatibility
static QualType checkConditionalPointerCompatibility(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc)
Checks compatibility between two pointers and return the resulting type.
Definition: SemaExpr.cpp:7043
clang::TypoCorrection
Simple class containing the result of Sema::CorrectTypo.
Definition: TypoCorrection.h:42
clang::ArraySubscriptExpr::getBase
Expr * getBase()
Definition: Expr.h:2505
clang::Sema::CheckAssignmentOperands
QualType CheckAssignmentOperands(Expr *LHSExpr, ExprResult &RHS, SourceLocation Loc, QualType CompoundType)
Definition: SemaExpr.cpp:11993
clang::ASTContext::areCommonBaseCompatible
QualType areCommonBaseCompatible(const ObjCObjectPointerType *LHSOPT, const ObjCObjectPointerType *RHSOPT)
Definition: ASTContext.cpp:8542
clang::QualType::isPODType
bool isPODType(const ASTContext &Context) const
Determine whether this is a Plain Old Data (POD) type (C++ 3.9p10).
Definition: Type.cpp:2185
clang::QualType::hasNonTrivialToPrimitiveCopyCUnion
bool hasNonTrivialToPrimitiveCopyCUnion() const
Check if this is or contains a C union that is non-trivial to copy, which is a union that has a membe...
Definition: Type.h:6398
clang::Type::isArrayType
bool isArrayType() const
Definition: Type.h:6570
clang::Sema::getExprRange
SourceRange getExprRange(Expr *E) const
Definition: SemaExpr.cpp:461
clang::Type::isMemberPointerType
bool isMemberPointerType() const
Definition: Type.h:6552
clang::MemberExpr::getMemberDecl
ValueDecl * getMemberDecl() const
Retrieve the member declaration to which this expression refers.
Definition: Expr.h:2919
clang::ImplicitConversionKind
ImplicitConversionKind
ImplicitConversionKind - The kind of implicit conversion used to convert an argument to a parameter&#39;s...
Definition: Overload.h:105
clang::MangleNumberingContext::getManglingNumber
virtual unsigned getManglingNumber(const CXXMethodDecl *CallOperator)=0
Retrieve the mangling number of a new lambda expression with the given call operator within this cont...
checkBlockType
static bool checkBlockType(Sema &S, const Expr *E)
Return true if the Expr is block type.
Definition: SemaExpr.cpp:7436
clang::FunctionDecl::isOverloadedOperator
bool isOverloadedOperator() const
Whether this function declaration represents an C++ overloaded operator, e.g., "operator+".
Definition: Decl.h:2525
clang::ASTContext::getFixedPointScale
unsigned char getFixedPointScale(QualType Ty) const
Definition: ASTContext.cpp:10775
clang::CallExpr::getArg
Expr * getArg(unsigned Arg)
getArg - Return the specified argument.
Definition: Expr.h:2702
clang::BlockDecl::hasCaptures
bool hasCaptures() const
True if this block (or its nested blocks) captures anything of local storage from its enclosing scope...
Definition: Decl.h:4156
DiagnoseSelfAssignment
static void DiagnoseSelfAssignment(Sema &S, Expr *LHSExpr, Expr *RHSExpr, SourceLocation OpLoc, bool IsBuiltin)
DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
Definition: SemaExpr.cpp:12762
clang::ObjCMethodDecl::getClassInterface
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1155
clang::FunctionDecl::isExternC
bool isExternC() const
Determines whether this function is a function with external, C linkage.
Definition: Decl.cpp:3075
clang::LocalInstantiationScope
A stack-allocated class that identifies which local variable declaration instantiations are present i...
Definition: Template.h:237
diagnoseArithmeticOnTwoFunctionPointers
static void diagnoseArithmeticOnTwoFunctionPointers(Sema &S, SourceLocation Loc, Expr *LHS, Expr *RHS)
Diagnose invalid arithmetic on two function pointers.
Definition: SemaExpr.cpp:9484
clang::ASTContext::getBuiltinVaListType
QualType getBuiltinVaListType() const
Retrieve the type of the __builtin_va_list type.
Definition: ASTContext.h:1929
clang::Sema::ActOnConditionalOp
ExprResult ActOnConditionalOp(SourceLocation QuestionLoc, SourceLocation ColonLoc, Expr *CondExpr, Expr *LHSExpr, Expr *RHSExpr)
ActOnConditionalOp - Parse a ?: operation.
Definition: SemaExpr.cpp:7912
clang::TargetInfo::getLongWidth
unsigned getLongWidth() const
getLongWidth/Align - Return the size of &#39;signed long&#39; and &#39;unsigned long&#39; for this target...
Definition: TargetInfo.h:401
clang::Sema::getFunctionLevelDeclContext
DeclContext * getFunctionLevelDeclContext()
Definition: Sema.cpp:1283
clang::Sema::ActOnIntegerConstant
ExprResult ActOnIntegerConstant(SourceLocation Loc, uint64_t Val)
Definition: SemaExpr.cpp:3445
clang::Expr::EvaluateKnownConstIntCheckOverflow
llvm::APSInt EvaluateKnownConstIntCheckOverflow(const ASTContext &Ctx, SmallVectorImpl< PartialDiagnosticAt > *Diag=nullptr) const
Definition: ExprConstant.cpp:13973
handleIntToFloatConversion
static QualType handleIntToFloatConversion(Sema &S, ExprResult &FloatExpr, ExprResult &IntExpr, QualType FloatTy, QualType IntTy, bool ConvertFloat, bool ConvertInt)
Handle arithmetic conversion from integer to float.
Definition: SemaExpr.cpp:1064
clang::APFixedPoint::getValue
llvm::APSInt getValue() const
Definition: FixedPoint.h:110
breakDownVectorType
static bool breakDownVectorType(QualType type, uint64_t &len, QualType &eltType)
Definition: SemaExpr.cpp:6603
clang::ASTContext::FractTy
CanQualType FractTy
Definition: ASTContext.h:1032
clang::QualType::isCForbiddenLValueType
bool isCForbiddenLValueType() const
Determine whether expressions of the given type are forbidden from being lvalues in C...
Definition: Type.h:6459
clang::Sema::LookupOrdinaryName
Ordinary name lookup, which finds ordinary names (functions, variables, typedefs, etc...
Definition: Sema.h:3463
clang::Sema::ActOnParenListExpr
ExprResult ActOnParenListExpr(SourceLocation L, SourceLocation R, MultiExprArg Val)
Definition: SemaExpr.cpp:6945
clang::ASTContext::Char32Ty
CanQualType Char32Ty
Definition: ASTContext.h:1024
checkConditionalNullPointer
static bool checkConditionalNullPointer(Sema &S, ExprResult &NullExpr, QualType PointerTy)
Return false if the NullExpr can be promoted to PointerTy, true otherwise.
Definition: SemaExpr.cpp:7030
diagnoseUnknownAnyExpr
static ExprResult diagnoseUnknownAnyExpr(Sema &S, Expr *E)
Definition: SemaExpr.cpp:17947
clang::LookupResult::setLookupName
void setLookupName(DeclarationName Name)
Sets the name to look up.
Definition: Lookup.h:248
clang::ASTContext::getPointerDiffType
QualType getPointerDiffType() const
Return the unique type for "ptrdiff_t" (C99 7.17) defined in <stddef.h>.
Definition: ASTContext.cpp:5294
clang::TemplateIdAnnotation::TemplateNameLoc
SourceLocation TemplateNameLoc
TemplateNameLoc - The location of the template name within the source.
Definition: ParsedTemplate.h:160
ConvertUTF8ToWideString
static void ConvertUTF8ToWideString(unsigned CharByteWidth, StringRef Source, SmallString< 32 > &Target)
Definition: SemaExpr.cpp:3306
clang::Type::STK_FloatingComplex
Definition: Type.h:2141
clang::NK_Dependent_Narrowing
Cannot tell whether this is a narrowing conversion because the expression is value-dependent.
Definition: Overload.h:245
clang::Type::isArithmeticType
bool isArithmeticType() const
Definition: Type.cpp:2036
clang::Stmt
Stmt - This represents one statement.
Definition: Stmt.h:66
clang::CallExpr::getNumArgs
unsigned getNumArgs() const
getNumArgs - Return the number of actual arguments to this call.
Definition: Expr.h:2689
clang::isGenericLambdaCallOperatorSpecialization
bool isGenericLambdaCallOperatorSpecialization(const CXXMethodDecl *MD)
Definition: ASTLambda.h:38
clang::NullabilityKind
NullabilityKind
Describes the nullability of a particular type.
Definition: Specifiers.h:315
clang::BuiltinType::getKind
Kind getKind() const
Definition: Type.h:2495
clang::FunctionType
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3422
EvaluatedExprVisitor.h
clang::Type::getPointeeType
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee...
Definition: Type.cpp:557
clang::TargetInfo::getTriple
const llvm::Triple & getTriple() const
Returns the target triple of the primary target.
Definition: TargetInfo.h:994
clang::EnumConstantDecl
An instance of this object exists for each enum constant that is defined.
Definition: Decl.h:2941
clang::Type::isRealFloatingType
bool isRealFloatingType() const
Floating point categories.
Definition: Type.cpp:2021
clang::sema::CapturingScopeInfo::ReturnType
QualType ReturnType
ReturnType - The target type of return statements in this context, or null if unknown.
Definition: ScopeInfo.h:659
clang::Sema::LookupMethodInObjectType
ObjCMethodDecl * LookupMethodInObjectType(Selector Sel, QualType Ty, bool IsInstance)
LookupMethodInType - Look up a method in an ObjCObjectType.
Definition: SemaExprObjC.cpp:1810
clang::sema::CapturingScopeInfo::isVLATypeCaptured
bool isVLATypeCaptured(const VariableArrayType *VAT) const
Determine whether the given variable-array type has been captured.
Definition: ScopeInfo.cpp:225
IsReadonlyMessage
static bool IsReadonlyMessage(Expr *E, Sema &S)
Definition: SemaExpr.cpp:11559
clang::QualType::DK_nontrivial_c_struct
Definition: Type.h:1167
clang::Expr::hasPlaceholderType
bool hasPlaceholderType() const
Returns whether this expression has a placeholder type.
Definition: Expr.h:481
clang::ElaboratedTypeLoc
Definition: TypeLoc.h:2087
Base
clang::Sema::ActOnArraySubscriptExpr
ExprResult ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc, Expr *Idx, SourceLocation RLoc)
Definition: SemaExpr.cpp:4450
clang::TypedefDecl
Represents the declaration of a typedef-name via the &#39;typedef&#39; type specifier.
Definition: Decl.h:3173
SourceManager.h
Defines the SourceManager interface.
clang::ConversionFixItGenerator::tryToFixConversion
bool tryToFixConversion(const Expr *FromExpr, const QualType FromQTy, const QualType ToQTy, Sema &S)
If possible, generates and stores a fix for the given conversion.
Definition: SemaFixItUtils.cpp:50
clang::CharSourceRange::getTokenRange
static CharSourceRange getTokenRange(SourceRange R)
Definition: SourceLocation.h:258
clang::QualType::addConst
void addConst()
Add the const type qualifier to this QualType.
Definition: Type.h:823
clang::Sema::BuildCXXDefaultArgExpr
ExprResult BuildCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD, ParmVarDecl *Param)
BuildCXXDefaultArgExpr - Creates a CXXDefaultArgExpr, instantiating the default expr if needed...
Definition: SemaExpr.cpp:5049
clang::FunctionDecl::isConstexpr
bool isConstexpr() const
Whether this is a (C++11) constexpr function or constexpr constructor.
Definition: Decl.h:2200
clang::ICK_Complex_Conversion
Complex conversions (C99 6.3.1.6)
Definition: Overload.h:140
clang::TemplateArgument::Expression
The template argument is an expression, and we&#39;ve not resolved it to one of the other forms yet...
Definition: TemplateBase.h:86
diagnoseObjCLiteralComparison
static void diagnoseObjCLiteralComparison(Sema &S, SourceLocation Loc, ExprResult &LHS, ExprResult &RHS, BinaryOperator::Opcode Opc)
Definition: SemaExpr.cpp:10307
clang::StringLiteral::isAscii
bool isAscii() const
Definition: Expr.h:1830
clang::Expr::MLV_IncompleteType
Definition: Expr.h:285
clang::Type::isRecordType
bool isRecordType() const
Definition: Type.h:6594
clang::Sema::InvalidLogicalVectorOperands
QualType InvalidLogicalVectorOperands(SourceLocation Loc, ExprResult &LHS, ExprResult &RHS)
Definition: SemaExpr.cpp:8865
clang::MemberExpr::getBase
Expr * getBase() const
Definition: Expr.h:2913
clang::CXXScopeSpec::isEmpty
bool isEmpty() const
No scope specifier.
Definition: DeclSpec.h:189
CheckIdentityFieldAssignment
static void CheckIdentityFieldAssignment(Expr *LHSExpr, Expr *RHSExpr, SourceLocation Loc, Sema &Sema)
Definition: SemaExpr.cpp:11948
clang::Type::isSpecificPlaceholderType
bool isSpecificPlaceholderType(unsigned K) const
Test for a specific placeholder type.
Definition: Type.h:6764
clang::InitializedEntity::InitializeParameter
static InitializedEntity InitializeParameter(ASTContext &Context, const ParmVarDecl *Parm)
Create the initialization entity for a parameter.
Definition: Initialization.h:248
clang::ASTContext::getQualifiedType
QualType getQualifiedType(SplitQualType split) const
Un-split a SplitQualType.
Definition: ASTContext.h:1958
clang::ASTContext::getLValueReferenceType
QualType getLValueReferenceType(QualType T, bool SpelledAsLValue=true) const
Return the uniqued reference to the type for an lvalue reference to the specified type...
Definition: ASTContext.cpp:3218
clang::TypeDecl::getTypeForDecl
const Type * getTypeForDecl() const
Definition: Decl.h:3053
clang::Sema::Diag
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1439
clang::Sema::CheckRemainderOperands
QualType CheckRemainderOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign=false)
Definition: SemaExpr.cpp:9424
clang::sema::Capture::getCaptureType
QualType getCaptureType() const
Retrieve the capture type for this capture, which is effectively the type of the non-static data memb...
Definition: ScopeInfo.h:625
clang::Sema::DiagnoseConditionalForNull
bool DiagnoseConditionalForNull(Expr *LHSExpr, Expr *RHSExpr, SourceLocation QuestionLoc)
Emit a specialized diagnostic when one expression is a null pointer constant and the other is not a p...
Definition: SemaExpr.cpp:6954
clang::Sema::ActOnBlockArguments
void ActOnBlockArguments(SourceLocation CaretLoc, Declarator &ParamInfo, Scope *CurScope)
ActOnBlockArguments - This callback allows processing of block arguments.
Definition: SemaExpr.cpp:14241
clang::Decl
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:88
DiagnoseRecursiveConstFields
static void DiagnoseRecursiveConstFields(Sema &S, const ValueDecl *VD, const RecordType *Ty, SourceLocation Loc, SourceRange Range, OriginalExprKind OEK, bool &DiagnosticEmitted)
Definition: SemaExpr.cpp:11756
clang::FunctionProtoType::isVariadic
bool isVariadic() const
Whether this function prototype is variadic.
Definition: Type.h:4086
clang::AvailabilitySpec::getPlatform
StringRef getPlatform() const
Definition: Availability.h:52
clang::PartialDiagnostic
Definition: PartialDiagnostic.h:34
clang::CXXMethodDecl::isVirtual
bool isVirtual() const
Definition: DeclCXX.h:1976
clang::OverloadCandidateSet::CSK_Normal
Normal lookup.
Definition: Overload.h:900
clang::CXXNewExpr::getOperatorNew
FunctionDecl * getOperatorNew() const
Definition: ExprCXX.h:2218
clang::Type::isExtVectorType
bool isExtVectorType() const
Definition: Type.h:6610
clang::Expr::setType
void setType(QualType t)
Definition: Expr.h:138
clang::Sema::PendingInstantiations
std::deque< PendingImplicitInstantiation > PendingInstantiations
The queue of implicit template instantiations that are required but have not yet been performed...
Definition: Sema.h:8573
clang::Sema::AssignConvertType
AssignConvertType
AssignConvertType - All of the &#39;assignment&#39; semantic checks return this enum to indicate whether the ...
Definition: Sema.h:10633
clang::UnresolvedLookupExpr
A reference to a name which we were able to look up during parsing but could not resolve to a specifi...
Definition: ExprCXX.h:3037
isReferenceToNonConstCapture
static NonConstCaptureKind isReferenceToNonConstCapture(Sema &S, Expr *E)
Definition: SemaExpr.cpp:11573
DeclTemplate.h
Defines the C++ template declaration subclasses.
clang::BinaryOperator::getOpcode
Opcode getOpcode() const
Definition: Expr.h:3469
clang::Scope::BreakScope
This is a while, do, switch, for, etc that can have break statements embedded into it...
Definition: Scope.h:51
clang::Sema::TUScope
Scope * TUScope
Translation Unit Scope - useful to Objective-C actions that need to lookup file scope declarations in...
Definition: Sema.h:934
clang::AutoType
Represents a C++11 auto or C++14 decltype(auto) type, possibly constrained by a type-constraint.
Definition: Type.h:4874
checkPointerIntegerMismatch
static bool checkPointerIntegerMismatch(Sema &S, ExprResult &Int, Expr *PointerExpr, SourceLocation Loc, bool IsIntFirstExpr)
Return false if the first expression is not an integer and the second expression is not a pointer...
Definition: SemaExpr.cpp:7237
clang::CallExpr::setNumArgsUnsafe
void setNumArgsUnsafe(unsigned NewNumArgs)
Bluntly set a new number of arguments without doing any checks whatsoever.
Definition: Expr.h:2732
clang::NK_Not_Narrowing
Not a narrowing conversion.
Definition: Overload.h:231
CheckObjCTraitOperandConstraints
static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T, SourceLocation Loc, SourceRange ArgRange, UnaryExprOrTypeTrait TraitKind)
Definition: SemaExpr.cpp:3901
clang::Sema::DefaultArgumentPromotion
ExprResult DefaultArgumentPromotion(Expr *E)
DefaultArgumentPromotion (C99 6.5.2.2p6).
Definition: SemaExpr.cpp:774
clang::sema::Capture::isCopyCapture
bool isCopyCapture() const
Definition: ScopeInfo.h:584
clang::ParenExpr
ParenExpr - This represents a parethesized expression, e.g.
Definition: Expr.h:1994
clang::QualType::getNonReferenceType
QualType getNonReferenceType() const
If Type is a reference type (e.g., const int&), returns the type that the reference refers to ("const...
Definition: Type.h:6452
clang::Sema::CheckVecStepExpr
bool CheckVecStepExpr(Expr *E)
Definition: SemaExpr.cpp:4149
clang::Sema::forceUnknownAnyToType
ExprResult forceUnknownAnyToType(Expr *E, QualType ToType)
Force an expression with unknown-type to an expression of the given type.
Definition: SemaExpr.cpp:17920
clang::Sema::CreateBuiltinArraySubscriptExpr
ExprResult CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc, Expr *Idx, SourceLocation RLoc)
Definition: SemaExpr.cpp:4732
clang::ASTContext::ARCUnbridgedCastTy
CanQualType ARCUnbridgedCastTy
Definition: ASTContext.h:1047
clang::FieldDecl::getParent
const RecordDecl * getParent() const
Returns the parent of this field declaration, which is the struct in which this field is defined...
Definition: Decl.h:2918
clang::IntegerLiteral
Definition: Expr.h:1446
clang::Sema::ActOnVAArg
ExprResult ActOnVAArg(SourceLocation BuiltinLoc, Expr *E, ParsedType Ty, SourceLocation RPLoc)
Definition: SemaExpr.cpp:14555
clang::ASTContext::getBlockPointerType
QualType getBlockPointerType(QualType T) const
Return the uniqued reference to the type for a block of the specified type.
Definition: ASTContext.cpp:3186
clang::Type
The base class of the type hierarchy.
Definition: Type.h:1450
clang::CanQual::getUnqualifiedType
CanQual< T > getUnqualifiedType() const
Retrieve the unqualified form of this type.
Definition: CanonicalType.h:618
clang::ASTContext::LongTy
CanQualType LongTy
Definition: ASTContext.h:1025
clang::Sema::CheckShiftOperands
QualType CheckShiftOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, BinaryOperatorKind Opc, bool IsCompAssign=false)
Definition: SemaExpr.cpp:10097
clang::Type::isClkEventT
bool isClkEventT() const
Definition: Type.h:6691
clang::Sema::CheckSubtractionOperands
QualType CheckSubtractionOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, QualType *CompLHSTy=nullptr)
Definition: SemaExpr.cpp:9808
clang::ASTContext::getCorrespondingSignedFixedPointType
QualType getCorrespondingSignedFixedPointType(QualType Ty) const
Definition: ASTContext.cpp:10887
clang::Declarator::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclSpec.h:1931
clang::Expr::MLV_ArrayTemporary
Definition: Expr.h:295
clang::CXXRecordDecl::isDerivedFrom
bool isDerivedFrom(const CXXRecordDecl *Base) const
Determine whether this class is derived from the class Base.
Definition: CXXInheritance.cpp:91
clang::sema::CapturingScopeInfo::ImpCap_LambdaByref
Definition: ScopeInfo.h:634
CXXInheritance.h
clang::ArrayType
Represents an array type, per C99 6.7.5.2 - Array Declarators.
Definition: Type.h:2889
clang::VarTemplateDecl
Declaration of a variable template.
Definition: DeclTemplate.h:3070
clang::ASTContext::getCorrespondingUnsignedType
QualType getCorrespondingUnsignedType(QualType T) const
Definition: ASTContext.cpp:9470
clang::TemplateArgument::Declaration
The template argument is a declaration that was provided for a pointer, reference, or pointer to member non-type template parameter.
Definition: TemplateBase.h:63
clang::Sema::getLocForEndOfToken
SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset=0)
Calls Lexer::getLocForEndOfToken()
Definition: Sema.cpp:49
clang::CXXConstructExpr
Represents a call to a C++ constructor.
Definition: ExprCXX.h:1422
clang::DeclarationNameInfo::getEndLoc
SourceLocation getEndLoc() const LLVM_READONLY
Definition: DeclarationName.h:805
clang::Expr::getValueKindForType
static ExprValueKind getValueKindForType(QualType T)
getValueKindForType - Given a formal return or parameter type, give its value kind.
Definition: Expr.h:404
clang::ObjCRuntime::allowsPointerArithmetic
bool allowsPointerArithmetic() const
Does this runtime allow pointer arithmetic on objects?
Definition: ObjCRuntime.h:323
clang::CharUnits::isZero
bool isZero() const
isZero - Test whether the quantity equals zero.
Definition: CharUnits.h:116
clang::QualType::withConst
QualType withConst() const
Definition: Type.h:826
convertPointersToCompositeType
static bool convertPointersToCompositeType(Sema &S, SourceLocation Loc, ExprResult &LHS, ExprResult &RHS)
Returns false if the pointers are converted to a composite type, true otherwise.
Definition: SemaExpr.cpp:10167
clang::FunctionType::getNoReturnAttr
bool getNoReturnAttr() const
Determine whether this function type includes the GNU noreturn attribute.
Definition: Type.h:3688
clang::ASTContext::getTargetInfo
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:707
clang::TemplateIdAnnotation::Kind
TemplateNameKind Kind
The kind of template that Template refers to.
Definition: ParsedTemplate.h:173
DeclObjC.h
clang::ASTContext::adjustStringLiteralBaseType
QualType adjustStringLiteralBaseType(QualType StrLTy) const
Definition: ASTContext.cpp:4077
clang::TypeSourceInfo
A container of type source information.
Definition: Type.h:6227
clang::FunctionDecl::getCallResultType
QualType getCallResultType() const
Determine the type of an expression that calls this function.
Definition: Decl.h:2481
handleComplexFloatConversion
static QualType handleComplexFloatConversion(Sema &S, ExprResult &LHS, ExprResult &RHS, QualType LHSType, QualType RHSType, bool IsCompAssign)
Handle arithmetic conversion with complex types.
Definition: SemaExpr.cpp:1008
clang::OpaquePtr< QualType >
LiteralSupport.h
clang::ASTContext::getLogicalOperationType
QualType getLogicalOperationType() const
The result type of logical operations, &#39;<&#39;, &#39;>&#39;, &#39;!=&#39;, etc.
Definition: ASTContext.h:1810
clang::AutoTypeKeyword::Auto
auto
clang::FPOptions
Floating point control options.
Definition: LangOptions.h:357
clang::XRayInstrKind::Function
constexpr XRayInstrMask Function
Definition: XRayInstr.h:38
clang::FunctionDecl::Create
static FunctionDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation NLoc, DeclarationName N, QualType T, TypeSourceInfo *TInfo, StorageClass SC, bool isInlineSpecified=false, bool hasWrittenPrototype=true, ConstexprSpecKind ConstexprKind=CSK_unspecified, Expr *TrailingRequiresClause=nullptr)
Definition: Decl.h:1955
clang::MSPropertySubscriptExpr
MS property subscript expression.
Definition: ExprCXX.h:937
clang::FunctionDecl::isDefined
bool isDefined(const FunctionDecl *&Definition) const
Returns true if the function has a definition that does not need to be instantiated.
Definition: Decl.cpp:2883
clang::Sema::CheckVectorLogicalOperands
QualType CheckVectorLogicalOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc)
Definition: SemaExpr.cpp:11392
CheckForModifiableLvalue
static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S)
CheckForModifiableLvalue - Verify that E is a modifiable lvalue.
Definition: SemaExpr.cpp:11820
clang::DecayedTypeLoc
Wrapper for source info for pointers decayed from arrays and functions.
Definition: TypeLoc.h:1187
clang::FunctionDecl::isImplicitlyInstantiable
bool isImplicitlyInstantiable() const
Determines whether this function is a function template specialization or a member of a class templat...
Definition: Decl.cpp:3571
clang::Sema::VerifyICEDiagnoser
Abstract base class used for diagnosing integer constant expression violations.
Definition: Sema.h:11122
clang::CXXBasePath
Represents a path from a specific derived class (which is not represented as part of the path) to a p...
Definition: CXXInheritance.h:70
checkVectorResult
static bool checkVectorResult(Sema &S, QualType CondTy, QualType VecResTy, SourceLocation QuestionLoc)
Return false if the vector condition type and the vector result type are compatible.
Definition: SemaExpr.cpp:7376
clang::CXXConstructorDecl
Represents a C++ constructor within a class.
Definition: DeclCXX.h:2383
clang::LookupResult::clear
LLVM_ATTRIBUTE_REINITIALIZES void clear()
Clears out any current state.
Definition: Lookup.h:554
clang::Sema::CheckCXXDefaultArgExpr
bool CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD, ParmVarDecl *Param)
Instantiate or parse a C++ default argument expression as necessary.
Definition: SemaExpr.cpp:4924
clang::ASTContext::WideCharTy
CanQualType WideCharTy
Definition: ASTContext.h:1020
TryTypoCorrectionForCall
static TypoCorrection TryTypoCorrectionForCall(Sema &S, Expr *Fn, FunctionDecl *FDecl, ArrayRef< Expr *> Args)
Definition: SemaExpr.cpp:5101
clang::Sema::MarkFunctionReferenced
void MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func, bool MightBeOdrUse=true)
Mark a function referenced, and check whether it is odr-used (C++ [basic.def.odr]p2, C99 6.9p3)
Definition: SemaExpr.cpp:15524
clang::FunctionDecl::param_size
size_t param_size() const
Definition: Decl.h:2415
clang::CC_X86StdCall
Definition: Specifiers.h:267
clang::Sema::isQualifiedMemberAccess
bool isQualifiedMemberAccess(Expr *E)
Determine whether the given expression is a qualified member access expression, of a form that could ...
Definition: SemaExpr.cpp:13800
clang::Sema::InstantiateVariableDefinition
void InstantiateVariableDefinition(SourceLocation PointOfInstantiation, VarDecl *Var, bool Recursive=false, bool DefinitionRequired=false, bool AtEndOfTU=false)
Instantiate the definition of the given variable from its template.
Definition: SemaTemplateInstantiateDecl.cpp:5027
clang::Expr::isModifiableLvalueResult
isModifiableLvalueResult
Definition: Expr.h:278
clang::ASTContext::HalfTy
CanQualType HalfTy
Definition: ASTContext.h:1040
clang::Sema::ActOnGNUNullExpr
ExprResult ActOnGNUNullExpr(SourceLocation TokenLoc)
Definition: SemaExpr.cpp:14676
clang::NOUR_Unevaluated
This name appears in an unevaluated operand.
Definition: Specifiers.h:164
clang::ArrayType::getElementType
QualType getElementType() const
Definition: Type.h:2910
clang::InitializedEntity::InitializeTemporary
static InitializedEntity InitializeTemporary(QualType Type)
Create the initialization entity for a temporary.
Definition: Initialization.h:318
clang::Type::getAsUnionType
const RecordType * getAsUnionType() const
NOTE: getAs*ArrayType are methods on ASTContext.
Definition: Type.cpp:592
Value
Value
Definition: UninitializedValues.cpp:101
clang::CharacterLiteral::UTF16
Definition: Expr.h:1536
clang::Sema::BuildBuiltinOffsetOf
ExprResult BuildBuiltinOffsetOf(SourceLocation BuiltinLoc, TypeSourceInfo *TInfo, ArrayRef< OffsetOfComponent > Components, SourceLocation RParenLoc)
__builtin_offsetof(type, a.b[123][456].c)
Definition: SemaExpr.cpp:13986
clang::sema::FunctionScopeInfo
Retains information about a function, method, or block that is currently being parsed.
Definition: ScopeInfo.h:98
clang::Type::isUnsignedIntegerType
bool isUnsignedIntegerType() const
Return true if this is an integer type that is unsigned, according to C99 6.2.5p6 [which returns true...
Definition: Type.cpp:1968
ASTLambda.h
This file provides some common utility functions for processing Lambda related AST Constructs...
clang::Sema::CheckVectorCast
bool CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty, CastKind &Kind)
Definition: SemaExpr.cpp:6684
hasIsEqualMethod
static bool hasIsEqualMethod(Sema &S, const Expr *LHS, const Expr *RHS)
Definition: SemaExpr.cpp:10219
clang::TemplateArgumentListInfo::setRAngleLoc
void setRAngleLoc(SourceLocation Loc)
Definition: TemplateBase.h:574
clang::CXXConstructExpr::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: ExprCXX.cpp:587
clang::Sema::UseArgumentDependentLookup
bool UseArgumentDependentLookup(const CXXScopeSpec &SS, const LookupResult &R, bool HasTrailingLParen)
Definition: SemaExpr.cpp:2945
clang::EnterExpressionEvaluationContext
RAII object that enters a new expression evaluation context.
Definition: Sema.h:12068
clang::VarDecl
Represents a variable declaration or definition.
Definition: Decl.h:820
funcHasParameterSizeMangling
static bool funcHasParameterSizeMangling(Sema &S, FunctionDecl *FD)
Return true if this function has a calling convention that requires mangling in the size of the param...
Definition: SemaExpr.cpp:15398
clang::Sema::PDiag
PartialDiagnostic PDiag(unsigned DiagID=0)
Build a partial diagnostic.
Definition: SemaInternal.h:24
clang::NestedNameSpecifier::Create
static NestedNameSpecifier * Create(const ASTContext &Context, NestedNameSpecifier *Prefix, IdentifierInfo *II)
Builds a specifier combining a prefix and an identifier.
Definition: NestedNameSpecifier.cpp:58
clang::ImplicitConversionSequence::isFailure
bool isFailure() const
Definition: Overload.h:632
clang::Sema::ExpressionEvaluationContextRecord::ExpressionKind
ExpressionKind
Describes whether we are in an expression constext which we have to handle differently.
Definition: Sema.h:1116
clang::Expr::MLV_LValueCast
Definition: Expr.h:284
clang::LookupResult::getLookupName
DeclarationName getLookupName() const
Gets the name to look up.
Definition: Lookup.h:243
clang::Declarator
Information about one declarator, including the parsed type information and the identifier.
Definition: DeclSpec.h:1792
clang::ObjCIsaExpr
ObjCIsaExpr - Represent X->isa and X.isa when X is an ObjC &#39;id&#39; type.
Definition: ExprObjC.h:1492
clang::Qualifiers::removeObjCLifetime
void removeObjCLifetime()
Definition: Type.h:339
clang::FunctionDecl::getReturnType
QualType getReturnType() const
Definition: Decl.h:2445
clang::CompoundLiteralExpr
CompoundLiteralExpr - [C99 6.5.2.5].
Definition: Expr.h:3077
clang::FunctionProtoType::isParamConsumed
bool isParamConsumed(unsigned I) const
Definition: Type.h:4181
diagnoseFunctionPointerToVoidComparison
static void diagnoseFunctionPointerToVoidComparison(Sema &S, SourceLocation Loc, ExprResult &LHS, ExprResult &RHS, bool IsError)
Definition: SemaExpr.cpp:10196
clang::FunctionProtoType::getNumParams
unsigned getNumParams() const
Definition: Type.h:3964
clang::Type::isEnumeralType
bool isEnumeralType() const
Definition: Type.h:6598
clang::SC_None
Definition: Specifiers.h:237
clang::DeclarationNameInfo::setCXXLiteralOperatorNameLoc
void setCXXLiteralOperatorNameLoc(SourceLocation Loc)
setCXXLiteralOperatorNameLoc - Sets the location of the literal operator name (not the operator keywo...
Definition: DeclarationName.h:779
clang::ASTContext::getFixedPointMax
APFixedPoint getFixedPointMax(QualType Ty) const
Definition: ASTContext.cpp:10877
clang::Type::getAs
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:7002
clang::Type::isOverloadableType
bool isOverloadableType() const
Determines whether this is a type for which one can define an overloaded operator.
Definition: Type.h:6907
clang::ASTContext::Float128Ty
CanQualType Float128Ty
Definition: ASTContext.h:1028
clang::Sema::computeDeclContext
DeclContext * computeDeclContext(QualType T)
Compute the DeclContext that is associated with the given type.
Definition: SemaCXXScopeSpec.cpp:53
clang::FunctionProtoType::ExtProtoInfo
Extra information about a function prototype.
Definition: Type.h:3837
clang::ASTContext::ShortAccumTy
CanQualType ShortAccumTy
Definition: ASTContext.h:1029
clang::LangAS
LangAS
Defines the address space values used by the address space qualifier of QualType. ...
Definition: AddressSpaces.h:25
clang::PredefinedExpr::FuncDName
Definition: Expr.h:1918
canConvertIntToOtherIntTy
static bool canConvertIntToOtherIntTy(Sema &S, ExprResult *Int, QualType OtherIntTy)
Test if a (constant) integer Int can be casted to another integer type IntTy without losing precision...
Definition: SemaExpr.cpp:8967
clang::VarTemplateSpecializationDecl
Represents a variable template specialization, which refers to a variable template with a given set o...
Definition: DeclTemplate.h:2655
TreeTransform.h
clang::ObjCMethodDecl
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:138
clang::NamedDecl::getUnderlyingDecl
NamedDecl * getUnderlyingDecl()
Looks through UsingDecls and ObjCCompatibleAliasDecls for the underlying named decl.
Definition: Decl.h:414
clang::Sema::UndefinedButUsed
llvm::MapVector< NamedDecl *, SourceLocation > UndefinedButUsed
UndefinedInternals - all the used, undefined objects which require a definition in this translation u...
Definition: Sema.h:1231
clang::LookupResult::isAmbiguous
bool isAmbiguous() const
Definition: Lookup.h:301
clang::TypoCorrection::getCorrectionSpecifier
NestedNameSpecifier * getCorrectionSpecifier() const
Gets the NestedNameSpecifier needed to use the typo correction.
Definition: TypoCorrection.h:91
clang::ASTContext::getMemberPointerType
QualType getMemberPointerType(QualType T, const Type *Cls) const
Return the uniqued reference to the type for a member pointer to the specified type in the specified ...
Definition: ASTContext.cpp:3291
clang::TypoCorrection::getCorrectionDeclAs
DeclClass * getCorrectionDeclAs() const
Definition: TypoCorrection.h:156
clang::Sema::BuildIvarRefExpr
ExprResult BuildIvarRefExpr(Scope *S, SourceLocation Loc, ObjCIvarDecl *IV)
Definition: SemaExpr.cpp:2678
handleIntegerToComplexFloatConversion
static bool handleIntegerToComplexFloatConversion(Sema &S, ExprResult &IntExpr, ExprResult &ComplexExpr, QualType IntTy, QualType ComplexTy, bool SkipCast)
Converts an integer to complex float type.
Definition: SemaExpr.cpp:986
clang::Sema::ActOnStartStmtExpr
void ActOnStartStmtExpr()
Definition: SemaExpr.cpp:13899
clang::Decl::isInvalidDecl
bool isInvalidDecl() const
Definition: DeclBase.h:553
clang::TypoCorrection::isOverloaded
bool isOverloaded() const
Definition: TypoCorrection.h:215
clang::ValueStmt::getExprStmt
const Expr * getExprStmt() const
Definition: Stmt.cpp:335
CheckAlignOfExpr
static bool CheckAlignOfExpr(Sema &S, Expr *E, UnaryExprOrTypeTrait ExprKind)
Definition: SemaExpr.cpp:4093
clang::ObjCPropertyDecl::findPropertyDecl
static ObjCPropertyDecl * findPropertyDecl(const DeclContext *DC, const IdentifierInfo *propertyID, ObjCPropertyQueryKind queryKind)
Lookup a property by name in the specified DeclContext.
Definition: DeclObjC.cpp:176
clang::InitializationKind::CreateDirectList
static InitializationKind CreateDirectList(SourceLocation InitLoc)
Definition: Initialization.h:609
clang::PredefinedExpr::Function
Definition: Expr.h:1916
ConstFunction
Definition: SemaExpr.cpp:11619
clang::ASTContext::ShortFractTy
CanQualType ShortFractTy
Definition: ASTContext.h:1032
SemaInternal.h
clang::Sema::BuildUnaryOp
ExprResult BuildUnaryOp(Scope *S, SourceLocation OpLoc, UnaryOperatorKind Opc, Expr *Input)
Definition: SemaExpr.cpp:13837
clang::tooling::fixit::internal::getSourceRange
CharSourceRange getSourceRange(const SourceRange &Range)
Returns the token CharSourceRange corresponding to Range.
Definition: FixIt.h:32
clang::Sema::tryCaptureVariable
bool tryCaptureVariable(VarDecl *Var, SourceLocation Loc, TryCaptureKind Kind, SourceLocation EllipsisLoc, bool BuildAndDiagnose, QualType &CaptureType, QualType &DeclRefType, const unsigned *const FunctionScopeIndexToStopAt)
Try to capture the given variable.
Definition: SemaExpr.cpp:16156
clang::CPlusPlus11
Definition: LangStandard.h:48
DiagnoseConstAssignment
static void DiagnoseConstAssignment(Sema &S, const Expr *E, SourceLocation Loc)
Emit the "read-only variable not assignable" error and print notes to give more information about why...
Definition: SemaExpr.cpp:11631
clang::ConversionFixItGenerator::Hints
std::vector< FixItHint > Hints
The list of Hints generated so far.
Definition: SemaFixItUtils.h:41
clang::MemberSpecializationInfo::getTemplateSpecializationKind
TemplateSpecializationKind getTemplateSpecializationKind() const
Determine what kind of template specialization this is.
Definition: DeclTemplate.h:644
clang::ParmVarDecl
Represents a parameter to a function.
Definition: Decl.h:1595
clang::Expr::LV_ClassTemporary
Definition: Expr.h:272
ExprCXX.h
Defines the clang::Expr interface and subclasses for C++ expressions.
clang::Token::getKind
tok::TokenKind getKind() const
Definition: Token.h:92
clang::BinaryOperator::isAdditiveOp
bool isAdditiveOp() const
Definition: Expr.h:3511
clang::BinaryOperator::isEqualityOp
bool isEqualityOp() const
Definition: Expr.h:3522
clang::sema::CapturingScopeInfo::addVLATypeCapture
void addVLATypeCapture(SourceLocation Loc, const VariableArrayType *VLAType, QualType CaptureType)
Definition: ScopeInfo.h:669
clang::ElaboratedTypeLoc::setQualifierLoc
void setQualifierLoc(NestedNameSpecifierLoc QualifierLoc)
Definition: TypeLoc.h:2105
diagnosePointerIncompatibility
static void diagnosePointerIncompatibility(Sema &S, SourceLocation Loc, Expr *LHSExpr, Expr *RHSExpr)
Emit error when two pointers are incompatible.
Definition: SemaExpr.cpp:9703
clang::Qualifiers
The collection of all-type qualifiers we support.
Definition: Type.h:143
GCCTypeClass::Bool
clang::Type::isVariableArrayType
bool isVariableArrayType() const
Definition: Type.h:6582
ContextKind
tok::TokenKind ContextKind
Definition: TokenAnnotator.cpp:1259
clang::Type::hasFloatingRepresentation
bool hasFloatingRepresentation() const
Determine whether this type has a floating-point representation of some sort, e.g., it is a floating-point type or a vector thereof.
Definition: Type.cpp:2014
clang::VarDecl::isARCPseudoStrong
bool isARCPseudoStrong() const
Determine whether this variable is an ARC pseudo-__strong variable.
Definition: Decl.h:1390
clang::Expr::isXValue
bool isXValue() const
Definition: Expr.h:260
clang::FunctionDecl::getReturnTypeSourceRange
SourceRange getReturnTypeSourceRange() const
Attempt to compute an informative source range covering the function return type. ...
Definition: Decl.cpp:3395
clang::Sema::MarkDeclarationsReferencedInType
void MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T)
Mark all of the declarations referenced within a particular AST node as referenced.
Definition: SemaExpr.cpp:17128
clang::LangOptions::LaxVectorConversionKind::Integer
Permit vector bitcasts between integer vectors with different numbers of elements but the same total ...
clang::NamedDecl::getIdentifier
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:244
clang::TypeLoc
Base wrapper for a particular "section" of type source info.
Definition: TypeLoc.h:58
checkObjCPointerTypesForAssignment
static Sema::AssignConvertType checkObjCPointerTypesForAssignment(Sema &S, QualType LHSType, QualType RHSType)
checkObjCPointerTypesForAssignment - Compares two objective-c pointer types for assignment compatibil...
Definition: SemaExpr.cpp:8210
clang::RecordDecl
Represents a struct/union/class.
Definition: Decl.h:3748
OpenCLConvertScalarsToVectors
static QualType OpenCLConvertScalarsToVectors(Sema &S, ExprResult &LHS, ExprResult &RHS, QualType CondTy, SourceLocation QuestionLoc)
Convert scalar operands to a vector that matches the condition in length.
Definition: SemaExpr.cpp:7322
clang::TreeTransform
A semantic tree transformation that allows one to transform one abstract syntax tree into another...
Definition: TreeTransform.h:99
clang::Sema::FindCompositeObjCPointerType
QualType FindCompositeObjCPointerType(ExprResult &LHS, ExprResult &RHS, SourceLocation QuestionLoc)
FindCompositeObjCPointerType - Helper method to find composite type of two objective-c pointer types ...
Definition: SemaExpr.cpp:7587
clang::TargetInfo::getPointerWidth
uint64_t getPointerWidth(unsigned AddrSpace) const
Return the width of pointers on this target, for the specified address space.
Definition: TargetInfo.h:361
clang::Expr::isOrdinaryOrBitFieldObject
bool isOrdinaryOrBitFieldObject() const
Definition: Expr.h:425
clang::UnqualifiedId::TemplateId
TemplateIdAnnotation * TemplateId
When Kind == IK_TemplateId or IK_ConstructorTemplateId, the template-id annotation that contains the ...
Definition: DeclSpec.h:1012
clang::Sema::UsualUnaryConversions
ExprResult UsualUnaryConversions(Expr *E)
UsualUnaryConversions - Performs various conversions that are common to most operators (C99 6...
Definition: SemaExpr.cpp:725
clang::NamedDecl::getDeclName
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:272
clang::Sema::ActOnPostfixUnaryOp
ExprResult ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, tok::TokenKind Kind, Expr *Input)
Definition: SemaExpr.cpp:4408
clang::Sema::BuildSourceLocExpr
ExprResult BuildSourceLocExpr(SourceLocExpr::IdentKind Kind, SourceLocation BuiltinLoc, SourceLocation RPLoc, DeclContext *ParentContext)
Definition: SemaExpr.cpp:14700
clang::DeclContext::Encloses
bool Encloses(const DeclContext *DC) const
Determine whether this declaration context encloses the declaration context DC.
Definition: DeclBase.cpp:1161
clang::NamedDecl::getFormalLinkage
Linkage getFormalLinkage() const
Get the linkage from a semantic point of view.
Definition: Decl.h:353
clang::FunctionProtoType::ExtProtoInfo::ExtInfo
FunctionType::ExtInfo ExtInfo
Definition: Type.h:3838
clang::IdentifierInfo
One of these records is kept for each identifier that is lexed.
Definition: IdentifierTable.h:57
clang::Sema::NSAPIObj
std::unique_ptr< NSAPI > NSAPIObj
Caches identifiers/selectors for NSFoundation APIs.
Definition: Sema.h:966
clang::Type::STK_MemberPointer
Definition: Type.h:2136
clang::Sema::CreateOverloadedBinOp
ExprResult CreateOverloadedBinOp(SourceLocation OpLoc, BinaryOperatorKind Opc, const UnresolvedSetImpl &Fns, Expr *LHS, Expr *RHS, bool RequiresADL=true, bool AllowRewrittenCandidates=true, FunctionDecl *DefaultedFn=nullptr)
Create a binary operation that may resolve to an overloaded operator.
Definition: SemaOverload.cpp:13142
clang::TargetInfo::getCXXABI
TargetCXXABI getCXXABI() const
Get the C++ ABI currently in use.
Definition: TargetInfo.h:1063
handleComplexIntConversion
static QualType handleComplexIntConversion(Sema &S, ExprResult &LHS, ExprResult &RHS, QualType LHSType, QualType RHSType, bool IsCompAssign)
Handle conversions with GCC complex int extension.
Definition: SemaExpr.cpp:1240
clang::DeclaratorDecl::getOuterLocStart
SourceLocation getOuterLocStart() const
Return start of source range taking into account any outer template declarations. ...
Definition: Decl.cpp:1879
needsConversionOfHalfVec
static bool needsConversionOfHalfVec(bool OpRequiresConversion, ASTContext &Ctx, QualType SrcType)
Returns true if conversion between vectors of halfs and vectors of floats is needed.
Definition: SemaExpr.cpp:12908
clang::Sema::CheckPtrComparisonWithNullChar
void CheckPtrComparisonWithNullChar(ExprResult &E, ExprResult &NullE)
Definition: SemaExpr.cpp:10729
clang::Sema::DiagnoseUnusedExprResult
void DiagnoseUnusedExprResult(const Stmt *S)
DiagnoseUnusedExprResult - If the statement passed in is an expression whose result is unused...
Definition: SemaStmt.cpp:218
clang::SourceLocExpr
Represents a function call to one of __builtin_LINE(), __builtin_COLUMN(), __builtin_FUNCTION(), or __builtin_FILE().
Definition: Expr.h:4301
clang::IdentifierInfo::isStr
bool isStr(const char(&Str)[StrLen]) const
Return true if this is the identifier for the specified string.
Definition: IdentifierTable.h:136
clang::ObjCObjectType
Represents a class type in Objective C.
Definition: Type.h:5694
clang::OK_VectorComponent
A vector component is an element or range of elements on a vector.
Definition: Specifiers.h:147
clang::TemplateArgument::getAsExpr
Expr * getAsExpr() const
Retrieve the template argument as an expression.
Definition: TemplateBase.h:329
clang::OpenCL
Definition: LangStandard.h:56
DiagnoseConditionalPrecedence
static void DiagnoseConditionalPrecedence(Sema &Self, SourceLocation OpLoc, Expr *Condition, Expr *LHSExpr, Expr *RHSExpr)
DiagnoseConditionalPrecedence - Emit a warning when a conditional operator and binary operator are mi...
Definition: SemaExpr.cpp:7826
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:168
clang::NestedNameSpecifierLoc
A C++ nested-name-specifier augmented with source location information.
Definition: NestedNameSpecifier.h:236
clang::TypoCorrection::getCorrection
DeclarationName getCorrection() const
Gets the DeclarationName of the typo correction.
Definition: TypoCorrection.h:84
clang::Sema::inTemplateInstantiation
bool inTemplateInstantiation() const
Determine whether we are currently performing template instantiation.
Definition: Sema.h:8444
clang::ExprEmpty
ExprResult ExprEmpty()
Definition: Ownership.h:285
checkArithmeticOpPointerOperand
static bool checkArithmeticOpPointerOperand(Sema &S, SourceLocation Loc, Expr *Operand)
Check the validity of an arithmetic pointer operand.
Definition: SemaExpr.cpp:9535
llvm::Optional
Definition: LLVM.h:37
clang::FunctionProtoType::getParamTypes
ArrayRef< QualType > getParamTypes() const
Definition: Type.h:3971
State
LineState State
Definition: UnwrappedLineFormatter.cpp:932
clang::Type::isObjCLifetimeType
bool isObjCLifetimeType() const
Returns true if objects of this type have lifetime semantics under ARC.
Definition: Type.cpp:4080
clang::Expr::ClassifyLValue
LValueClassification ClassifyLValue(ASTContext &Ctx) const
Reasons why an expression might not be an l-value.
Definition: ExprClassification.cpp:659
clang::ArraySubscriptExpr::getExprLoc
SourceLocation getExprLoc() const LLVM_READONLY
Definition: Expr.h:2523
clang::ObjCMethodFamily
ObjCMethodFamily
A family of Objective-C methods.
Definition: IdentifierTable.h:623
clang::UETT_PreferredAlignOf
Used for GCC&#39;s __alignof.
Definition: TypeTraits.h:106
clang::FullExpr
FullExpr - Represents a "full-expression" node.
Definition: Expr.h:950
clang::TemplateSpecializationType::anyDependentTemplateArguments
static bool anyDependentTemplateArguments(ArrayRef< TemplateArgumentLoc > Args, bool &InstantiationDependent)
Determine whether any of the given template arguments are dependent.
Definition: Type.cpp:3428
rewriteBuiltinFunctionDecl
static FunctionDecl * rewriteBuiltinFunctionDecl(Sema *Sema, ASTContext &Context, FunctionDecl *FDecl, MultiExprArg ArgExprs)
If a builtin function has a pointer argument with no explicit address space, then it should be able t...
Definition: SemaExpr.cpp:5525
clang::CorrectionCandidateCallback
Base class for callback objects used by Sema::CorrectTypo to check the validity of a potential typo c...
Definition: TypoCorrection.h:281
checkPointerTypesForAssignment
static Sema::AssignConvertType checkPointerTypesForAssignment(Sema &S, QualType LHSType, QualType RHSType)
Definition: SemaExpr.cpp:8021
clang::Type::isCharType
bool isCharType() const
Definition: Type.cpp:1871
clang::RecordDecl::fields
field_range fields() const
Definition: Decl.h:3963
clang::TypeLocBuilder::getTypeSourceInfo
TypeSourceInfo * getTypeSourceInfo(ASTContext &Context, QualType T)
Creates a TypeSourceInfo for the given type.
Definition: TypeLocBuilder.h:101
clang::Stmt::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:275
clang::DeclarationName::getNameKind
NameKind getNameKind() const
Determine what kind of name this is.
Definition: DeclarationName.h:384
clang::Type::isObjCIdType
bool isObjCIdType() const
Definition: Type.h:6651
NCCK_Block
Definition: SemaExpr.cpp:11572
clang::FieldDecl
Represents a member of a struct/union/class.
Definition: Decl.h:2729
clang::NestedNameSpecifier::getAsType
const Type * getAsType() const
Retrieve the type stored in this nested name specifier.
Definition: NestedNameSpecifier.h:194
clang::Sema::checkSpecializationVisibility
void checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec)
We&#39;ve found a use of a templated declaration that would trigger an implicit instantiation.
Definition: SemaTemplate.cpp:10850
clang::Sema::ExpressionEvaluationContext::PotentiallyEvaluated
The current expression is potentially evaluated at run time, which means that code may be generated t...
clang::ASTContext::setBOOLDecl
void setBOOLDecl(TypedefDecl *TD)
Save declaration of &#39;BOOL&#39; typedef.
Definition: ASTContext.h:1910
clang::CharacterLiteral::UTF32
Definition: Expr.h:1537
clang::ICK_Identity
Identity conversion (no conversion)
Definition: Overload.h:107
clang::ArrayType::Static
Definition: Type.h:2896
clang::TemplateArgumentListInfo::size
unsigned size() const
Definition: TemplateBase.h:576
clang::CompoundStmt::getStmtExprResult
Stmt * getStmtExprResult()
Definition: Stmt.h:1439
clang::UnaryExprOrTypeTrait
UnaryExprOrTypeTrait
Names for the "expression or type" traits.
Definition: TypeTraits.h:96
clang::Sema::DefaultedComparisonKind
DefaultedComparisonKind
Kinds of defaulted comparison operator functions.
Definition: Sema.h:1287
clang::LookupResult::getLookupNameInfo
const DeclarationNameInfo & getLookupNameInfo() const
Gets the name info to look up.
Definition: Lookup.h:233
clang::FunctionProtoType::ExtProtoInfo::TypeQuals
Qualifiers TypeQuals
Definition: Type.h:3841
clang::ASTContext::LongAccumTy
CanQualType LongAccumTy
Definition: ASTContext.h:1029
clang::ICK_Floating_Conversion
Floating point conversions (C++ [conv.double].
Definition: Overload.h:137
clang::GNUNullExpr
GNUNullExpr - Implements the GNU __null extension, which is a name for a null pointer constant that h...
Definition: Expr.h:4216
clang::Type::isReferenceType
bool isReferenceType() const
Definition: Type.h:6516
clang::CallExpr::setArg
void setArg(unsigned Arg, Expr *ArgExpr)
setArg - Set the specified argument.
Definition: Expr.h:2712
clang::Sema::DiagnoseEqualityWithExtraParens
void DiagnoseEqualityWithExtraParens(ParenExpr *ParenE)
Redundant parentheses over an equality comparison can indicate that the user intended an assignment u...
Definition: SemaExpr.cpp:17376
DiagnoseDirectIsaAccess
static void DiagnoseDirectIsaAccess(Sema &S, const ObjCIvarRefExpr *OIRE, SourceLocation AssignLoc, const Expr *RHS)
Definition: SemaExpr.cpp:533
clang::CallExpr::shrinkNumArgs
void shrinkNumArgs(unsigned NewNumArgs)
Reduce the number of arguments in this call expression.
Definition: Expr.h:2723
clang::Token
Token - This structure provides full information about a lexed token.
Definition: Token.h:34
clang::ASTContext::ObjCQualifiedIdTypesAreCompatible
bool ObjCQualifiedIdTypesAreCompatible(const ObjCObjectPointerType *LHS, const ObjCObjectPointerType *RHS, bool ForCompare)
ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an ObjCQualifiedIDType.
Definition: ASTContext.cpp:8187
clang::Decl::isDefinedOutsideFunctionOrMethod
bool isDefinedOutsideFunctionOrMethod() const
isDefinedOutsideFunctionOrMethod - This predicate returns true if this scoped decl is defined outside...
Definition: DeclBase.h:855
ScopeInfo.h
clang::Sema::CompatiblePointerDiscardsQualifiers
CompatiblePointerDiscardsQualifiers - The assignment discards c/v/r qualifiers, which we accept as an...
Definition: Sema.h:10661
diagnoseArithmeticOnTwoVoidPointers
static void diagnoseArithmeticOnTwoVoidPointers(Sema &S, SourceLocation Loc, Expr *LHSExpr, Expr *RHSExpr)
Diagnose invalid arithmetic on two void pointers.
Definition: SemaExpr.cpp:9450
clang::Type::isSpecificBuiltinType
bool isSpecificBuiltinType(unsigned K) const
Test for a particular builtin type.
Definition: Type.h:6744
clang::DeclContext::Equals
bool Equals(const DeclContext *DC) const
Determine whether this declaration context is equivalent to the declaration context DC...
Definition: DeclBase.h:1908
clang::UnresolvedMemberExpr
Represents a C++ member access expression for which lookup produced a set of overloaded functions...
Definition: ExprCXX.h:3771
clang::FixItHint::isNull
bool isNull() const
Definition: Diagnostic.h:86
clang::Sema::isOpenMPCapturedByRef
bool isOpenMPCapturedByRef(const ValueDecl *D, unsigned Level, unsigned OpenMPCaptureLevel) const
Return true if the provided declaration VD should be captured by reference.
Definition: SemaOpenMP.cpp:1803
clang::Token::setKind
void setKind(tok::TokenKind K)
Definition: Token.h:93
clang::Sema::ACK_Conditional
A conditional (?:) operator.
Definition: Sema.h:10615
clang::ExtVectorElementExpr
ExtVectorElementExpr - This represents access to specific elements of a vector, and may occur on the ...
Definition: Expr.h:5524
clang::Sema::ActOnObjCBoolLiteral
ExprResult ActOnObjCBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind)
ActOnObjCBoolLiteral - Parse {__objc_yes,__objc_no} literals.
Definition: SemaExpr.cpp:18112
clang::LookupResult::getResultKind
LookupResultKind getResultKind() const
Definition: Lookup.h:321
clang::CastExpr::getSubExpr
Expr * getSubExpr()
Definition: Expr.h:3202
clang::DeclaratorDecl::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Decl.h:723
clang::Sema::CheckConditionalOperands
QualType CheckConditionalOperands(ExprResult &Cond, ExprResult &LHS, ExprResult &RHS, ExprValueKind &VK, ExprObjectKind &OK, SourceLocation QuestionLoc)
Note that LHS is not null here, even if this is the gnu "x ?: y" extension.
Definition: SemaExpr.cpp:7450
clang::DeclarationName::CXXLiteralOperatorName
Definition: DeclarationName.h:212
clang::Type::isObjCQualifiedClassType
bool isObjCQualifiedClassType() const
Definition: Type.h:6645
clang::Sema::ExpressionEvaluationContextRecord::ExprContext
enum clang::Sema::ExpressionEvaluationContextRecord::ExpressionKind ExprContext
clang::Sema::DefaultFunctionArrayConversion
ExprResult DefaultFunctionArrayConversion(Expr *E, bool Diagnose=true)
DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
Definition: SemaExpr.cpp:470
clang::Sema::PopExpressionEvaluationContext
void PopExpressionEvaluationContext()
Definition: SemaExpr.cpp:15284
clang::QualType::isAtLeastAsQualifiedAs
bool isAtLeastAsQualifiedAs(QualType Other) const
Determine whether this type is at least as qualified as the other given type, requiring exact equalit...
Definition: Type.h:6433
clang::BinaryOperator::isAssignmentOp
bool isAssignmentOp() const
Definition: Expr.h:3563
clang::Type::isIntegralOrEnumerationType
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:6881
clang::LookupResult::NotFoundInCurrentInstantiation
No entity found met the criteria within the current instantiation,, but there were dependent base cla...
Definition: Lookup.h:55
llvm::SmallVectorImpl
Definition: LLVM.h:36
clang::ASTContext::Idents
IdentifierTable & Idents
Definition: ASTContext.h:580
clang::Sema::NoteDeletedFunction
void NoteDeletedFunction(FunctionDecl *FD)
Emit a note explaining that this function is deleted.
Definition: SemaExpr.cpp:100
clang::VK_RValue
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:125
clang::Declarator::isInvalidType
bool isInvalidType() const
Definition: DeclSpec.h:2530
clang::InitializedEntity::InitializeBlock
static InitializedEntity InitializeBlock(SourceLocation BlockVarLoc, QualType Type, bool NRVO)
Definition: Initialization.h:295
clang::FunctionDecl::parameters
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2399
clang::Expr::EvaluateAsBooleanCondition
bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx, bool InConstantContext=false) const
EvaluateAsBooleanCondition - Return true if this is a constant which we can fold and convert to a boo...
Definition: ExprConstant.cpp:13761
clang::NullabilityKind::Nullable
Values of this type can be null.
clang::Selector::isUnarySelector
bool isUnarySelector() const
Definition: IdentifierTable.h:762
clang::Language::CUDA
clang::ASTContext::LongFractTy
CanQualType LongFractTy
Definition: ASTContext.h:1032
clang::Scope::ControlScope
The controlling scope in a if/switch/while/for statement.
Definition: Scope.h:62
clang::Type::STK_ObjCObjectPointer
Definition: Type.h:2135
clang::LookupResult::getAsSingle
DeclClass * getAsSingle() const
Definition: Lookup.h:507
clang::VarDecl::getPointOfInstantiation
SourceLocation getPointOfInstantiation() const
If this variable is an instantiation of a variable template or a static data member of a class templa...
Definition: Decl.cpp:2570
clang::BinaryOperator::getOpcodeStr
StringRef getOpcodeStr() const
Definition: Expr.h:3490
clang::ObjCIvarRefExpr::getOpLoc
SourceLocation getOpLoc() const
Definition: ExprObjC.h:597
GetFixedPointRank
static unsigned GetFixedPointRank(QualType Ty)
Return the rank of a given fixed point or integer type.
Definition: SemaExpr.cpp:1286
checkCondition
static bool checkCondition(Sema &S, Expr *Cond, SourceLocation QuestionLoc)
Return false if the condition expression is valid, true otherwise.
Definition: SemaExpr.cpp:6993
clang::TypeLocBuilder
Definition: TypeLocBuilder.h:22
clang::Expr::isGLValue
bool isGLValue() const
Definition: Expr.h:261
clang::ObjCMethodDecl::getMethodFamily
ObjCMethodFamily getMethodFamily() const
Determines the family of this method.
Definition: DeclObjC.cpp:997
clang::Expr::MLV_MemberFunction
Definition: Expr.h:291
clang::ParenListExpr::Create
static ParenListExpr * Create(const ASTContext &Ctx, SourceLocation LParenLoc, ArrayRef< Expr *> Exprs, SourceLocation RParenLoc)
Create a paren list.
Definition: Expr.cpp:4502
clang::InitListExpr
Describes an C or C++ initializer list.
Definition: Expr.h:4409
clang::Sema::CheckStaticArrayArgument
void CheckStaticArrayArgument(SourceLocation CallLoc, ParmVarDecl *Param, const Expr *ArgExpr)
CheckStaticArrayArgument - If the given argument corresponds to a static array parameter, check that it is non-null, and that if it is formed by array-to-pointer decay, the underlying array is sufficiently large.
Definition: SemaExpr.cpp:5386
IsTypeModifiable
static bool IsTypeModifiable(QualType Ty, bool IsDereference)
Definition: SemaExpr.cpp:11609
clang::ObjCIvarRefExpr::isArrow
bool isArrow() const
Definition: ExprObjC.h:584
clang::Sema::ActOnBlockStmtExpr
ExprResult ActOnBlockStmtExpr(SourceLocation CaretLoc, Stmt *Body, Scope *CurScope)
ActOnBlockStmtExpr - This is called when the body of a block statement literal was successfully compl...
Definition: SemaExpr.cpp:14370
clang::sema::Capture::isThisCapture
bool isThisCapture() const
Definition: ScopeInfo.h:579
CheckVecStepTraitOperandType
static bool CheckVecStepTraitOperandType(Sema &S, QualType T, SourceLocation Loc, SourceRange ArgRange)
Definition: SemaExpr.cpp:3853
clang::BinaryOperatorKind
BinaryOperatorKind
Definition: OperationKinds.h:25
clang::UnqualifiedId
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:960
clang::FixedPointLiteral::CreateFromRawInt
static FixedPointLiteral * CreateFromRawInt(const ASTContext &C, const llvm::APInt &V, QualType type, SourceLocation l, unsigned Scale)
Definition: Expr.cpp:950
clang::Sema::CanUseDecl
bool CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid)
Determine whether the use of this declaration is valid, without emitting diagnostics.
Definition: SemaExpr.cpp:54
checkArithmeticOrEnumeralThreeWayCompare
static QualType checkArithmeticOrEnumeralThreeWayCompare(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc)
Definition: SemaExpr.cpp:10620
clang::FieldDecl::isBitField
bool isBitField() const
Determines whether this field is a bitfield.
Definition: Decl.h:2807
clang::Expr::EvalStatus::Diag
SmallVectorImpl< PartialDiagnosticAt > * Diag
Diag - If this is non-null, it will be filled in with a stack of notes indicating why evaluation fail...
Definition: Expr.h:573
clang::StringLiteral::getLength
unsigned getLength() const
Definition: Expr.h:1823
clang::TypeSpecTypeLoc::setNameLoc
void setNameLoc(SourceLocation Loc)
Definition: TypeLoc.h:527
clang::LookupResult
Represents the results of name lookup.
Definition: Lookup.h:46
OpenCLArithmeticConversions
static QualType OpenCLArithmeticConversions(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation QuestionLoc)
Simple conversion between integer and floating point types.
Definition: SemaExpr.cpp:7267
clang::ActionResult::get
PtrTy get() const
Definition: Ownership.h:170
clang::Sema::CallExprUnaryConversions
ExprResult CallExprUnaryConversions(Expr *E)
CallExprUnaryConversions - a special case of an unary conversion performed on a function designator o...
Definition: SemaExpr.cpp:703
canConvertIntTyToFloatTy
static bool canConvertIntTyToFloatTy(Sema &S, ExprResult *Int, QualType FloatTy)
Test if a (constant) integer Int can be casted to floating point type FloatTy without losing precisio...
Definition: SemaExpr.cpp:9005
clang::Expr::refersToBitField
bool refersToBitField() const
Returns true if this expression is a gl-value that potentially refers to a bit-field.
Definition: Expr.h:446
clang::FunctionDecl::getBody
Stmt * getBody(const FunctionDecl *&Definition) const
Retrieve the body (definition) of the function.
Definition: Decl.cpp:2894
clang::CXXDeleteExpr::getOperatorDelete
FunctionDecl * getOperatorDelete() const
Definition: ExprCXX.h:2399
clang::DeclAccessPair::make
static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS)
Definition: DeclAccessPair.h:35
clang::Sema::MaybeConvertParenListExprToParenExpr
ExprResult MaybeConvertParenListExprToParenExpr(Scope *S, Expr *ME)
This is not an AltiVec-style cast or or C++ direct-initialization, so turn the ParenListExpr into a s...
Definition: SemaExpr.cpp:6929
isVariableCapturable
static bool isVariableCapturable(CapturingScopeInfo *CSI, VarDecl *Var, SourceLocation Loc, const bool Diagnose, Sema &S)
Definition: SemaExpr.cpp:15879
clang::Sema::ActOnBlockStart
void ActOnBlockStart(SourceLocation CaretLoc, Scope *CurScope)
ActOnBlockStart - This callback is invoked when a block literal is started.
Definition: SemaExpr.cpp:14212
clang::ParmVarDecl::getOriginalType
QualType getOriginalType() const
Definition: Decl.cpp:2681
clang::Sema::getCurMethodDecl
ObjCMethodDecl * getCurMethodDecl()
getCurMethodDecl - If inside of a method body, this returns a pointer to the method decl for the meth...
Definition: Sema.cpp:1309
clang::OverloadExpr::FindResult::HasFormOfMemberPointer
bool HasFormOfMemberPointer
Definition: ExprCXX.h:2896
clang::Sema::LK_Block
Definition: Sema.h:3139
clang::IdentifierInfo::getTokenID
tok::TokenKind getTokenID() const
If this is a source-language token (e.g.
Definition: IdentifierTable.h:185
clang::CharUnits
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
clang::Sema::BuildDeclRefExpr
DeclRefExpr * BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK, SourceLocation Loc, const CXXScopeSpec *SS=nullptr)
Definition: SemaExpr.cpp:1866
clang::Sema::ActOnCallExpr
ExprResult ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc, MultiExprArg ArgExprs, SourceLocation RParenLoc, Expr *ExecConfig=nullptr)
ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
Definition: SemaExpr.cpp:5706
clang::Expr::EvalResult::Val
APValue Val
Val - This is the value the expression can be folded to.
Definition: Expr.h:588
clang::TemplateArgumentListInfo
A convenient class for passing around template argument information.
Definition: TemplateBase.h:554
clang::FunctionCallFilterCCC::ValidateCandidate
bool ValidateCandidate(const TypoCorrection &candidate) override
Simple predicate used by the default RankCandidate to determine whether to return an edit distance of...
Definition: SemaLookup.cpp:5236
clang::Expr::MLV_InvalidExpression
Definition: Expr.h:283
clang::Expr::LV_Valid
Definition: Expr.h:264
clang::format::Tok
const FormatToken & Tok
Definition: BreakableToken.h:239
clang::CXXBindTemporaryExpr::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: ExprCXX.h:1400
clang::MangleNumberingContext
Keeps track of the mangled names of lambda expressions and block literals within a particular context...
Definition: MangleNumberingContext.h:31
clang::PredefinedExpr::PrettyFunction
Definition: Expr.h:1921
clang::Type::getAsArrayTypeUnsafe
const ArrayType * getAsArrayTypeUnsafe() const
A variant of getAs<> for array types which silently discards qualifiers from the outermost type...
Definition: Type.h:7053
clang::Sema::CheckAssignmentConstraints
AssignConvertType CheckAssignmentConstraints(SourceLocation Loc, QualType LHSType, QualType RHSType)
CheckAssignmentConstraints - Perform type checking for assignment, argument passing, variable initialization, and function return values.
Definition: SemaExpr.cpp:8244
clang::Scope::ContinueScope
This is a while, do, for, which can have continue statements embedded into it.
Definition: Scope.h:55
clang::Sema::CheckFloatComparison
void CheckFloatComparison(SourceLocation Loc, Expr *LHS, Expr *RHS)
Check for comparisons of floating point operands using != and ==.
Definition: SemaChecking.cpp:10130
clang::FunctionDecl::hasPrototype
bool hasPrototype() const
Whether this function has a prototype, either because one was explicitly written or because it was "i...
Definition: Decl.h:2173
clang::NullabilityKind::Unspecified
Whether values of this type can be null is (explicitly) unspecified.
clang::FunctionCallFilterCCC
Definition: TypoCorrection.h:379
clang::VK_XValue
An x-value expression is a reference to an object with independent storage but which can be "moved"...
Definition: Specifiers.h:134
clang::Expr::getValueKind
ExprValueKind getValueKind() const
getValueKind - The value kind that this expression produces.
Definition: Expr.h:414
clang::ComparisonCategoryType::First
NestedConstMember
Definition: SemaExpr.cpp:11623
clang::Sema::CorrectDelayedTyposInExpr
ExprResult CorrectDelayedTyposInExpr(Expr *E, VarDecl *InitDecl=nullptr, llvm::function_ref< ExprResult(Expr *)> Filter=[](Expr *E) -> ExprResult { return E;})
Process any TypoExprs in the given Expr and its children, generating diagnostics as appropriate and r...
Definition: SemaExprCXX.cpp:8167
clang::Sema::CheckCXXThisCapture
bool CheckCXXThisCapture(SourceLocation Loc, bool Explicit=false, bool BuildAndDiagnose=true, const unsigned *const FunctionScopeIndexToStopAt=nullptr, bool ByCopy=false)
Make sure the value of &#39;this&#39; is actually available in the current context, if it is a potentially ev...
Definition: SemaExprCXX.cpp:1146
clang::toTargetAddressSpace
unsigned toTargetAddressSpace(LangAS AS)
Definition: AddressSpaces.h:66
checkDirectCallValidity
static void checkDirectCallValidity(Sema &S, const Expr *Fn, FunctionDecl *Callee, MultiExprArg ArgExprs)
Definition: SemaExpr.cpp:5599
clang::TypeDecl::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Decl.h:3056
clang::Sema::IsFunctionConversion
bool IsFunctionConversion(QualType FromType, QualType ToType, QualType &ResultTy)
Determine whether the conversion from FromType to ToType is a valid conversion that strips "noexcept"...
Definition: SemaOverload.cpp:1528
clang::Sema::MarkDeclRefReferenced
void MarkDeclRefReferenced(DeclRefExpr *E, const Expr *Base=nullptr)
Perform reference-marking and odr-use handling for a DeclRefExpr.
Definition: SemaExpr.cpp:17034
clang::getAsTypeTemplateDecl
TemplateDecl * getAsTypeTemplateDecl(Decl *D)
Definition: DeclTemplate.h:3271
clang::Type::STK_CPointer
Definition: Type.h:2133
recoverFromMSUnqualifiedLookup
static Expr * recoverFromMSUnqualifiedLookup(Sema &S, ASTContext &Context, DeclarationNameInfo &NameInfo, SourceLocation TemplateKWLoc, const TemplateArgumentListInfo *TemplateArgs)
In Microsoft mode, if we are inside a template class whose parent class has dependent base classes...
Definition: SemaExpr.cpp:2233
clang::sema::BlockScopeInfo::FunctionType
QualType FunctionType
BlockType - The function type of the block, if one was given.
Definition: ScopeInfo.h:726
clang::VarDecl::getTemplateSpecializationKind
TemplateSpecializationKind getTemplateSpecializationKind() const
If this variable is an instantiation of a variable template or a static data member of a class templa...
Definition: Decl.cpp:2549
clang::TypeDecl
Represents a declaration of a type.
Definition: Decl.h:3029
clang::BinaryOperator
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:3434
clang::QualType::isVolatileQualified
bool isVolatileQualified() const
Determine whether this type is volatile-qualified.
Definition: Type.h:6326
clang::DeclaratorDecl::getQualifierLoc
NestedNameSpecifierLoc getQualifierLoc() const
Retrieve the nested-name-specifier (with source-location information) that qualifies the name of this...
Definition: Decl.h:737
clang::ASTContext::PseudoObjectTy
CanQualType PseudoObjectTy
Definition: ASTContext.h:1047
clang::QualType::hasNonTrivialToPrimitiveDestructCUnion
bool hasNonTrivialToPrimitiveDestructCUnion() const
Check if this is or contains a C union that is non-trivial to destruct, which is a union that has a m...
Definition: Type.h:6392
clang::Qualifiers::getAddressSpace
LangAS getAddressSpace() const
Definition: Type.h:359
checkConditionalBlockPointerCompatibility
static QualType checkConditionalBlockPointerCompatibility(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc)
Return the resulting type when the operands are both block pointers.
Definition: SemaExpr.cpp:7172
clang::LangAS::opencl_private
clang::StandardConversionSequence::Second
ImplicitConversionKind Second
Second - The second conversion can be an integral promotion, floating point promotion, integral conversion, floating point conversion, floating-integral conversion, pointer conversion, pointer-to-member conversion, or boolean conversion.
Definition: Overload.h:267
clang::Sema::ActOnObjCAvailabilityCheckExpr
ExprResult ActOnObjCAvailabilityCheckExpr(llvm::ArrayRef< AvailabilitySpec > AvailSpecs, SourceLocation AtLoc, SourceLocation RParen)
Definition: SemaExpr.cpp:18131
clang::TemplateIdAnnotation::getTemplateArgs
ParsedTemplateArgument * getTemplateArgs()
Retrieves a pointer to the template arguments.
Definition: ParsedTemplate.h:187
clang::CorrectionCandidateCallback::setTypoNNS
void setTypoNNS(NestedNameSpecifier *NNS)
Definition: TypoCorrection.h:323
ExprObjC.h
clang::MemberExpr::isArrow
bool isArrow() const
Definition: Expr.h:3020
clang::NK_Constant_Narrowing
A narrowing conversion, because a constant expression got narrowed.
Definition: Overload.h:237
clang::ASTContext::getObjCClassRedefinitionType
QualType getObjCClassRedefinitionType() const
Retrieve the type that Class has been defined to, which may be different from the built-in Class if C...
Definition: ASTContext.h:1674
clang::ASTContext::LongDoubleTy
CanQualType LongDoubleTy
Definition: ASTContext.h:1028
clang::Expr::IgnoreParenCasts
Expr * IgnoreParenCasts() LLVM_READONLY
Skip past any parentheses and casts which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:3000
clang::NullabilityKind::NonNull
Values of this type can never be null.
clang::Sema::getCapturedDeclRefType
QualType getCapturedDeclRefType(VarDecl *Var, SourceLocation Loc)
Given a variable, determine the type that a reference to that variable will have in the given scope...
Definition: SemaExpr.cpp:16397
clang::Expr::MLV_IncompleteVoidType
Definition: Expr.h:281
clang::getLambdaAwareParentOfDeclContext
DeclContext * getLambdaAwareParentOfDeclContext(DeclContext *DC)
Definition: ASTLambda.h:81
clang::VariableArrayType::getSizeExpr
Expr * getSizeExpr() const
Definition: Type.h:3058
clang::Scope
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
clang::InitializationSequence::Perform
ExprResult Perform(Sema &S, const InitializedEntity &Entity, const InitializationKind &Kind, MultiExprArg Args, QualType *ResultType=nullptr)
Perform the actual initialization of the given entity based on the computed initialization sequence...
Definition: SemaInit.cpp:7750
clang::QualType::getTypePtr
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:6256
clang::ASTContext::getBOOLDecl
TypedefDecl * getBOOLDecl() const
Retrieve declaration of &#39;BOOL&#39; typedef.
Definition: ASTContext.h:1905
CheckExtensionTraitOperandType
static bool CheckExtensionTraitOperandType(Sema &S, QualType T, SourceLocation Loc, SourceRange ArgRange, UnaryExprOrTypeTrait TraitKind)
Definition: SemaExpr.cpp:3871
clang::CXXRecordDecl::getCanonicalDecl
CXXRecordDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclCXX.h:492
clang::StringLiteral::StringKind
StringKind
StringLiteral is followed by several trailing objects.
Definition: Expr.h:1733
clang::Sema::BuildResolvedCallExpr
ExprResult BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl, SourceLocation LParenLoc, ArrayRef< Expr *> Arg, SourceLocation RParenLoc, Expr *Config=nullptr, bool IsExecConfig=false, ADLCallKind UsesADL=ADLCallKind::NotADL)
BuildResolvedCallExpr - Build a call to a resolved expression, i.e.
Definition: SemaExpr.cpp:5909
clang::declaresSameEntity
bool declaresSameEntity(const Decl *D1, const Decl *D2)
Determine whether two declarations declare the same entity.
Definition: DeclBase.h:1166
clang::ParmVarDecl::hasUnparsedDefaultArg
bool hasUnparsedDefaultArg() const
Determines whether this parameter has a default argument that has not yet been parsed.
Definition: Decl.h:1709
clang::TypoExpr
TypoExpr - Internal placeholder for expressions where typo correction still needs to be performed and...
Definition: Expr.h:5984
clang::Expr::MLV_ArrayType
Definition: Expr.h:289
clang::Sema::ActOnIdExpression
ExprResult ActOnIdExpression(Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, UnqualifiedId &Id, bool HasTrailingLParen, bool IsAddressOfOperand, CorrectionCandidateCallback *CCC=nullptr, bool IsInlineAsmIdentifier=false, Token *KeywordReplacement=nullptr)
Definition: SemaExpr.cpp:2274
clang::Sema::WarnOnPendingNoDerefs
void WarnOnPendingNoDerefs(ExpressionEvaluationContextRecord &Rec)
Emit a warning for all pending noderef expressions that we recorded.
Definition: SemaExpr.cpp:15248
clang::APValue::isInt
bool isInt() const
Definition: APValue.h:361
clang::ParenListExpr
Definition: Expr.h:5149
clang::Lexer::AdvanceToTokenCharacter
static SourceLocation AdvanceToTokenCharacter(SourceLocation TokStart, unsigned Characters, const SourceManager &SM, const LangOptions &LangOpts)
AdvanceToTokenCharacter - If the current SourceLocation specifies a location at the start of a token...
Definition: Lexer.h:363
clang::BinaryOperator::isRelationalOp
bool isRelationalOp() const
Definition: Expr.h:3519
clang::TagDecl::hasNameForLinkage
bool hasNameForLinkage() const
Is this tag type named, either directly or via being defined in a typedef of this type...
Definition: Decl.h:3425
clang::CXXScopeSpec
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:63
captureVariablyModifiedType
static void captureVariablyModifiedType(ASTContext &Context, QualType T, CapturingScopeInfo *CSI)
Definition: SemaExpr.cpp:4159
clang::CastExpr
CastExpr - Base class for type casts, including both implicit casts (ImplicitCastExpr) and explicit c...
Definition: Expr.h:3150
CheckIndirectionOperand
static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK, SourceLocation OpLoc)
CheckIndirectionOperand - Type check unary indirection (prefix &#39;*&#39;).
Definition: SemaExpr.cpp:12638
ConstMember
Definition: SemaExpr.cpp:11621
clang::OffsetOfNode
Helper class for OffsetOfExpr.
Definition: Expr.h:2163
clang::Sema::ExpressionEvaluationContext::DiscardedStatement
The current expression occurs within a discarded statement.
clang::ObjCProtocolDecl
Represents an Objective-C protocol declaration.
Definition: DeclObjC.h:2078
clang::CXXBindTemporaryExpr
Represents binding an expression to a temporary.
Definition: ExprCXX.h:1373
clang::CXXBindTemporaryExpr::getTemporary
CXXTemporary * getTemporary()
Definition: ExprCXX.h:1392
clang::Type::isBlockCompatibleObjCPointerType
bool isBlockCompatibleObjCPointerType(ASTContext &ctx) const
Definition: Type.cpp:3983
checkAddressOfFunctionIsAvailable
static bool checkAddressOfFunctionIsAvailable(Sema &S, const FunctionDecl *FD, bool Complain, bool InOverloadResolution, SourceLocation Loc)
Returns true if we can take the address of the function.
Definition: SemaOverload.cpp:9950
clang::LambdaExpr
A C++ lambda expression, which produces a function object (of unspecified type) that can be invoked l...
Definition: ExprCXX.h:1818
clang::Sema::getLangOpts
const LangOptions & getLangOpts() const
Definition: Sema.h:1352
clang::IntegerLiteral::Create
static IntegerLiteral * Create(const ASTContext &C, const llvm::APInt &V, QualType type, SourceLocation l)
Returns a new integer literal with value &#39;V&#39; and type &#39;type&#39;.
Definition: Expr.cpp:928
clang::CXXMethodDecl::isInstance
bool isInstance() const
Definition: DeclCXX.h:1959
clang::Expr::isTypeDependent
bool isTypeDependent() const
isTypeDependent - Determines whether this expression is type-dependent (C++ [temp.dep.expr]), which means that its type could change from one template instantiation to the next.
Definition: Expr.h:176
clang::Sema::DefaultFunctionArrayLvalueConversion
ExprResult DefaultFunctionArrayLvalueConversion(Expr *E, bool Diagnose=true)
Definition: SemaExpr.cpp:691
clang::Type::isScalarType
bool isScalarType() const
Definition: Type.h:6866
clang::Sema::ActOnNumericConstant
ExprResult ActOnNumericConstant(const Token &Tok, Scope *UDLScope=nullptr)
Definition: SemaExpr.cpp:3511
clang::Sema::CheckSingleAssignmentConstraints
AssignConvertType CheckSingleAssignmentConstraints(QualType LHSType, ExprResult &RHS, bool Diagnose=true, bool DiagnoseCFAudited=false, bool ConvertRHS=true)
Check assignment constraints for an assignment of RHS to LHSType.
Definition: SemaExpr.cpp:8666
clang::Qualifiers::compatiblyIncludesObjCLifetime
bool compatiblyIncludesObjCLifetime(Qualifiers other) const
Determines if these qualifiers compatibly include another set of qualifiers from the narrow perspecti...
Definition: Type.h:517
clang::SourceLocation::isFileID
bool isFileID() const
Definition: SourceLocation.h:98
clang::OK_Ordinary
An ordinary object is located at an address in memory.
Definition: Specifiers.h:141
clang::isLambdaCallOperator
bool isLambdaCallOperator(const CXXMethodDecl *MD)
Definition: ASTLambda.h:27
clang::CPlusPlus2a
Definition: LangStandard.h:51
clang::Sema::MaybeODRUseExprs
MaybeODRUseExprSet MaybeODRUseExprs
Definition: Sema.h:615
DiagnoseLogicalAndInLogicalOrRHS
static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc, Expr *LHSExpr, Expr *RHSExpr)
Look for &#39;&&&#39; in the right hand of a &#39;||&#39; expr.
Definition: SemaExpr.cpp:13296
clang::RecursiveASTVisitor
A class that does preorder or postorder depth-first traversal on the entire Clang AST and visits each...
Definition: RecursiveASTVisitor.h:151
clang::Sema::isUnevaluatedContext
bool isUnevaluatedContext() const
Determines whether we are currently in a context that is not evaluated as per C++ [expr] p5...
Definition: Sema.h:8473
clang::ObjCInterfaceDecl
Represents an ObjC class declaration.
Definition: DeclObjC.h:1186
clang::NOUR_None
This is an odr-use.
Definition: Specifiers.h:162
clang::Sema::ExpressionEvaluationContextRecord::Lambdas
SmallVector< LambdaExpr *, 2 > Lambdas
The lambdas that are present within this context, if it is indeed an unevaluated context.
Definition: Sema.h:1092
clang::UnaryOperator::getOperatorLoc
SourceLocation getOperatorLoc() const
getOperatorLoc - Return the location of the operator.
Definition: Expr.h:2080
clang::ObjCMethodDecl::getReturnType
QualType getReturnType() const
Definition: DeclObjC.h:324
clang::LookupResult::addDecl
void addDecl(NamedDecl *D)
Add a declaration to these results with its natural access.
Definition: Lookup.h:426
clang::FunctionDecl::getBuiltinID
unsigned getBuiltinID(bool ConsiderWrapperFunctions=false) const
Returns a value indicating whether this function corresponds to a builtin function.
Definition: Decl.cpp:3173
clang::Sema::PrepareScalarCast
CastKind PrepareScalarCast(ExprResult &src, QualType destType)
Prepares for a scalar cast, performing all the necessary stages except the final cast and returning t...
Definition: SemaExpr.cpp:6394
llvm::ArrayRef
Definition: LLVM.h:31
enclosingClassIsRelatedToClassInWhichMembersWereFound
static bool enclosingClassIsRelatedToClassInWhichMembersWereFound(const UnresolvedMemberExpr *const UME, Sema &S)
Definition: SemaExpr.cpp:5625
clang::Sema::IncompatiblePointerSign
IncompatiblePointerSign - The assignment is between two pointers types which point to integers which ...
Definition: Sema.h:10657
llvm::SmallString< 32 >
clang::Sema::BuildDeclarationNameExpr
ExprResult BuildDeclarationNameExpr(const CXXScopeSpec &SS, LookupResult &R, bool NeedsADL, bool AcceptInvalidDecl=false)
Definition: SemaExpr.cpp:3034
isOdrUseContext
static OdrUseContext isOdrUseContext(Sema &SemaRef)
Are we within a context in which references to resolved functions or to variables result in odr-use...
Definition: SemaExpr.cpp:15486
clang::UnresolvedLookupExpr::Create
static UnresolvedLookupExpr * Create(const ASTContext &Context, CXXRecordDecl *NamingClass, NestedNameSpecifierLoc QualifierLoc, const DeclarationNameInfo &NameInfo, bool RequiresADL, bool Overloaded, UnresolvedSetIterator Begin, UnresolvedSetIterator End)
Definition: ExprCXX.cpp:404
clang::Type::STK_Floating
Definition: Type.h:2139
clang::ASTContext::getBOOLType
QualType getBOOLType() const
type of &#39;BOOL&#39; type.
Definition: ASTContext.h:1915
clang::FunctionDecl::getMemberSpecializationInfo
MemberSpecializationInfo * getMemberSpecializationInfo() const
If this function is an instantiation of a member function of a class template specialization, retrieves the member specialization information.
Definition: Decl.cpp:3540
ASTMutationListener.h
clang::Sema::ExpressionEvaluationContext::ConstantEvaluated
The current context is "potentially evaluated" in C++11 terms, but the expression is evaluated at com...
clang::CXXScopeSpec::getWithLocInContext
NestedNameSpecifierLoc getWithLocInContext(ASTContext &Context) const
Retrieve a nested-name-specifier with location information, copied into the given AST context...
Definition: DeclSpec.cpp:142
clang::Sema::checkUnknownAnyArg
ExprResult checkUnknownAnyArg(SourceLocation callLoc, Expr *result, QualType &paramType)
Type-check an expression that&#39;s being passed to an __unknown_anytype parameter.
Definition: SemaExpr.cpp:17924
clang::Sema::MarkVariableReferenced
void MarkVariableReferenced(SourceLocation Loc, VarDecl *Var)
Mark a variable referenced, and check whether it is odr-used (C++ [basic.def.odr]p2, C99 6.9p3).
Definition: SemaExpr.cpp:16995
clang::Declarator::getIdentifier
IdentifierInfo * getIdentifier() const
Definition: DeclSpec.h:2172
clang::ASTContext::UnsignedCharTy
CanQualType UnsignedCharTy
Definition: ASTContext.h:1026
clang::CXXDefaultArgExpr
A default argument (C++ [dcl.fct.default]).
Definition: ExprCXX.h:1202
Template.h
clang::Sema::LangOpts
const LangOptions & LangOpts
Definition: Sema.h:383
clang::Decl::getCanonicalDecl
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:877
clang::Type::isUnsignedFixedPointType
bool isUnsignedFixedPointType() const
Return true if this is a fixed point type that is unsigned according to ISO/IEC JTC1 SC22 WG14 N1169...
Definition: Type.h:6862
clang::Expr::MLV_ClassTemporary
Definition: Expr.h:294
clang::Expr::IgnoreImpCasts
Expr * IgnoreImpCasts() LLVM_READONLY
Skip past any implicit casts which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2975
CheckForNullPointerDereference
static void CheckForNullPointerDereference(Sema &S, Expr *E)
Definition: SemaExpr.cpp:508
clang::Type::hasUnsignedIntegerRepresentation
bool hasUnsignedIntegerRepresentation() const
Determine whether this type has an unsigned integer representation of some sort, e.g., it is an unsigned integer type or a vector.
Definition: Type.cpp:1998
clang::TypeLocBuilder::pushTypeSpec
TypeSpecTypeLoc pushTypeSpec(QualType T)
Pushes space for a typespec TypeLoc.
Definition: TypeLocBuilder.h:68
clang::MemberExpr::Create
static MemberExpr * Create(const ASTContext &C, Expr *Base, bool IsArrow, SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, ValueDecl *MemberDecl, DeclAccessPair FoundDecl, DeclarationNameInfo MemberNameInfo, const TemplateArgumentListInfo *TemplateArgs, QualType T, ExprValueKind VK, ExprObjectKind OK, NonOdrUseReason NOUR)
Definition: Expr.cpp:1662
clang::Sema::ActOnStmtExprError
void ActOnStmtExprError()
Definition: SemaExpr.cpp:13903
clang::Sema::VarArgKind
VarArgKind
Definition: Sema.h:10573
clang::TypeLocBuilder::push
TyLocType push(QualType T)
Pushes space for a new TypeLoc of the given type.
Definition: TypeLocBuilder.h:93
clang::ObjCIvarRefExpr::getDecl
ObjCIvarDecl * getDecl()
Definition: ExprObjC.h:576
clang::Qualifiers::withoutObjCGCAttr
Qualifiers withoutObjCGCAttr() const
Definition: Type.h:316
clang::Sema::ExpressionEvaluationContextRecord::NumCleanupObjects
unsigned NumCleanupObjects
The number of active cleanup objects when we entered this expression evaluation context.
Definition: Sema.h:1082
clang::BinaryOperator::isNullPointerArithmeticExtension
static bool isNullPointerArithmeticExtension(ASTContext &Ctx, Opcode Opc, Expr *LHS, Expr *RHS)
Definition: Expr.cpp:2119
rebuildPotentialResultsAsNonOdrUsed
static ExprResult rebuildPotentialResultsAsNonOdrUsed(Sema &S, Expr *E, NonOdrUseReason NOUR)
Walk the set of potential results of an expression and mark them all as non-odr-uses if they satisfy ...
Definition: SemaExpr.cpp:16441
clang::AS_none
Definition: Specifiers.h:117
OEK_Variable
Definition: SemaExpr.cpp:11751
clang::sema::CapturingScopeInfo::ImpCaptureStyle
ImplicitCaptureStyle ImpCaptureStyle
Definition: ScopeInfo.h:638
clang::TemplateIdAnnotation::LAngleLoc
SourceLocation LAngleLoc
The location of the &#39;<&#39; before the template argument list.
Definition: ParsedTemplate.h:177
clang::Sema::getDiagnostics
DiagnosticsEngine & getDiagnostics() const
Definition: Sema.h:1356
clang::Type::isIntegralOrUnscopedEnumerationType
bool isIntegralOrUnscopedEnumerationType() const
Determine whether this type is an integral or unscoped enumeration type.
Definition: Type.cpp:1857
clang::sema::LambdaScopeInfo::addPotentialCapture
void addPotentialCapture(Expr *VarExpr)
Add a variable that might potentially be captured by the lambda and therefore the enclosing lambdas...
Definition: ScopeInfo.h:908
clang::Type::isHalfType
bool isHalfType() const
Definition: Type.h:6783
Parent
NodeId Parent
Definition: ASTDiff.cpp:191
DiagnoseDivisionSizeofPointerOrArray
static void DiagnoseDivisionSizeofPointerOrArray(Sema &S, Expr *LHS, Expr *RHS, SourceLocation Loc)
Definition: SemaExpr.cpp:9337
clang::Sema::getNonOdrUseReasonInCurrentContext
NonOdrUseReason getNonOdrUseReasonInCurrentContext(ValueDecl *D)
If D cannot be odr-used in the current expression evaluation context, return a reason explaining why...
Definition: SemaExpr.cpp:1885
clang::ConversionFixItGenerator::Kind
OverloadFixItKind Kind
The type of fix applied.
Definition: SemaFixItUtils.h:49
clang::ExplicitCastExpr::getTypeAsWritten
QualType getTypeAsWritten() const
getTypeAsWritten - Returns the type that this expression is casting to, as written in the source code...
Definition: Expr.h:3360
clang::OMPArraySectionExpr
OpenMP 4.0 [2.4, Array Sections].
Definition: ExprOpenMP.h:44
clang::Sema::BuildPredefinedExpr
ExprResult BuildPredefinedExpr(SourceLocation Loc, PredefinedExpr::IdentKind IK)
Definition: SemaExpr.cpp:3318
clang::DefaultFilterCCC
Definition: TypoCorrection.h:352
clang::Decl::hasAttr
bool hasAttr() const
Definition: DeclBase.h:542
clang::ConditionalOperator
ConditionalOperator - The ?: ternary operator.
Definition: Expr.h:3732
clang::ASTContext::getCorrespondingSaturatedType
QualType getCorrespondingSaturatedType(QualType Ty) const
Definition: ASTContext.cpp:10721
clang::Sema
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:336
DiagnoseBinOpPrecedence
static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc, SourceLocation OpLoc, Expr *LHSExpr, Expr *RHSExpr)
DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky precedence.
Definition: SemaExpr.cpp:13370
clang::Type::isPromotableIntegerType
bool isPromotableIntegerType() const
More type predicates useful for type checking/promotion.
Definition: Type.cpp:2560
clang::LookupResult::setNamingClass
void setNamingClass(CXXRecordDecl *Record)
Sets the &#39;naming class&#39; for this lookup.
Definition: Lookup.h:408
clang::TypoCorrection::getFoundDecl
NamedDecl * getFoundDecl() const
Get the correction declaration found by name lookup (before we looked through using shadow declaratio...
Definition: TypoCorrection.h:146
ExprLooksBoolean
static bool ExprLooksBoolean(Expr *E)
ExprLooksBoolean - Returns true if E looks boolean, i.e.
Definition: SemaExpr.cpp:7805
clang::sema::LambdaScopeInfo::Mutable
bool Mutable
Whether this is a mutable lambda.
Definition: ScopeInfo.h:814
clang::CompoundStmt
CompoundStmt - This represents a group of statements like { stmt stmt }.
Definition: Stmt.h:1347
clang::Type::getAsCXXRecordDecl
CXXRecordDecl * getAsCXXRecordDecl() const
Retrieves the CXXRecordDecl that this type refers to, either because the type is a RecordType or beca...
Definition: Type.cpp:1690
clang::Sema::checkVariadicArgument
void checkVariadicArgument(const Expr *E, VariadicCallType CT)
Check to see if the given expression is a valid argument to a variadic function, issuing a diagnostic...
Definition: SemaExpr.cpp:876
clang::FunctionProtoType
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3754
clang::CXXScopeSpec::MakeTrivial
void MakeTrivial(ASTContext &Context, NestedNameSpecifier *Qualifier, SourceRange R)
Make a new nested-name-specifier from incomplete source-location information.
Definition: DeclSpec.cpp:118
computeConditionalNullability
static QualType computeConditionalNullability(QualType ResTy, bool IsBin, QualType LHSTy, QualType RHSTy, ASTContext &Ctx)
Compute the nullability of a conditional expression.
Definition: SemaExpr.cpp:7862
clang::Decl::getAvailability
AvailabilityResult getAvailability(std::string *Message=nullptr, VersionTuple EnclosingVersion=VersionTuple(), StringRef *RealizedPlatform=nullptr) const
Determine the availability of the given declaration.
Definition: DeclBase.cpp:574
clang::Sema::MarkAnyDeclReferenced
void MarkAnyDeclReferenced(SourceLocation Loc, Decl *D, bool MightBeOdrUse)
Perform marking for a reference to an arbitrary declaration.
Definition: SemaExpr.cpp:17075
ConstUnknown
Definition: SemaExpr.cpp:11624
clang::VarDecl::isUsableInConstantExpressions
bool isUsableInConstantExpressions(ASTContext &C) const
Determine whether this variable&#39;s value can be used in a constant expression, according to the releva...
Definition: Decl.cpp:2323
clang::Qualifiers::compatiblyIncludes
bool compatiblyIncludes(Qualifiers other) const
Determines if these qualifiers compatibly include another set.
Definition: Type.h:496
getDeclFromExpr
static NamedDecl * getDeclFromExpr(Expr *E)
Definition: SemaExpr.cpp:12839
clang::Sema::CreateBuiltinBinOp
ExprResult CreateBuiltinBinOp(SourceLocation OpLoc, BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr)
CreateBuiltinBinOp - Creates a new built-in binary operation with operator Opc at location TokLoc...
Definition: SemaExpr.cpp:12918
clang::FunctionDecl::getOverloadedOperator
OverloadedOperatorKind getOverloadedOperator() const
getOverloadedOperator - Which C++ overloaded operator this function represents, if any...
Definition: Decl.cpp:3501
clang::Type::isComplexType
bool isComplexType() const
isComplexType() does not include complex integers (a GCC extension).
Definition: Type.cpp:533
clang::Sema::CheckShadowingDeclModification
void CheckShadowingDeclModification(Expr *E, SourceLocation Loc)
Warn if &#39;E&#39;, which is an expression that is about to be modified, refers to a shadowing declaration...
Definition: SemaDecl.cpp:7477
clang::sema::CapturedRegionScopeInfo
Retains information about a captured region.
Definition: ScopeInfo.h:742
clang::CXXConstructExpr::getConstructor
CXXConstructorDecl * getConstructor() const
Get the constructor that this expression will (ultimately) call.
Definition: ExprCXX.h:1494
DiagnoseBitwiseOpInBitwiseOp
static void DiagnoseBitwiseOpInBitwiseOp(Sema &S, BinaryOperatorKind Opc, SourceLocation OpLoc, Expr *SubExpr)
Look for bitwise op in the left or right hand of a bitwise op with lower precedence and emit a diagno...
Definition: SemaExpr.cpp:13313
clang::CastKind
CastKind
CastKind - The kind of operation required for a conversion.
Definition: OperationKinds.h:20
clang::TypeLoc::getLocalSourceRange
SourceRange getLocalSourceRange() const
Get the local source range.
Definition: TypeLoc.h:158
emitEmptyLookupTypoDiagnostic
static void emitEmptyLookupTypoDiagnostic(const TypoCorrection &TC, Sema &SemaRef, const CXXScopeSpec &SS, DeclarationName Typo, SourceLocation TypoLoc, ArrayRef< Expr *> Args, unsigned DiagnosticID, unsigned DiagnosticSuggestID)
Definition: SemaExpr.cpp:1998
clang::ImplicitCastExpr::Create
static ImplicitCastExpr * Create(const ASTContext &Context, QualType T, CastKind Kind, Expr *Operand, const CXXCastPath *BasePath, ExprValueKind Cat)
Definition: Expr.cpp:1998
checkConditionalVoidType
static QualType checkConditionalVoidType(Sema &S, ExprResult &LHS, ExprResult &RHS)
Handle when one or both operands are void type.
Definition: SemaExpr.cpp:7012
clang::ASTContext::DeclarationNames
DeclarationNameTable DeclarationNames
Definition: ASTContext.h:583
clang::Expr::NPC_NeverValueDependent
Specifies that the expression should never be value-dependent.
Definition: Expr.h:735
clang::Sema::CheckAdditionOperands
QualType CheckAdditionOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, BinaryOperatorKind Opc, QualType *CompLHSTy=nullptr)
Definition: SemaExpr.cpp:9713
clang::Sema::FunctionVoidPointer
FunctionVoidPointer - The assignment is between a function pointer and void*, which the standard does...
Definition: Sema.h:10647
clang::Type::STK_IntegralComplex
Definition: Type.h:2140
clang::UnaryOperator::setSubExpr
void setSubExpr(Expr *E)
Definition: Expr.h:2077
clang::UnaryExprOrTypeTraitExpr
UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) expression operand...
Definition: Expr.h:2372
clang::Type::isNonOverloadPlaceholderType
bool isNonOverloadPlaceholderType() const
Test for a placeholder type other than Overload; see BuiltinType::isNonOverloadPlaceholderType.
Definition: Type.h:6771
clang::BinaryOperator::getOpcodeStr
static StringRef getOpcodeStr(Opcode Op)
getOpcodeStr - Turn an Opcode enum value into the punctuation char it corresponds to...
Definition: Expr.cpp:2047
clang::Expr::MLV_InvalidMessageExpression
Definition: Expr.h:293
Used
Definition: ObjCUnusedIVarsChecker.cpp:29
OdrUseContext
OdrUseContext
Definition: SemaExpr.cpp:15471
clang::ASTContext::isObjCSelType
bool isObjCSelType(QualType T) const
Definition: ASTContext.h:2601
clang::QualType::hasQualifiers
bool hasQualifiers() const
Determine whether this type has any qualifiers.
Definition: Type.h:6331
diagnoseStringPlusChar
static void diagnoseStringPlusChar(Sema &Self, SourceLocation OpLoc, Expr *LHSExpr, Expr *RHSExpr)
Emit a warning when adding a char literal to a string.
Definition: SemaExpr.cpp:9652
clang::Sema::MaybeODRUseExprSet
llvm::SmallPtrSet< Expr *, 2 > MaybeODRUseExprSet
Store a set of either DeclRefExprs or MemberExprs that contain a reference to a variable (constant) t...
Definition: Sema.h:614
clang::DeclRefExpr::getLocation
SourceLocation getLocation() const
Definition: Expr.h:1255
clang::CXXScopeSpec::getRange
SourceRange getRange() const
Definition: DeclSpec.h:68
clang::CharUnits::getQuantity
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
Overload.h
clang::ObjCIvarDecl::getUsageType
QualType getUsageType(QualType objectType) const
Retrieve the type of this instance variable when viewed as a member of a specific object type...
Definition: DeclObjC.cpp:1839
clang::Sema::ICEConvertDiagnoser
Definition: Sema.h:3096
clang::SourceLocExpr::IdentKind
IdentKind
Definition: Expr.h:4306
clang::VAArgExpr
Represents a call to the builtin function __builtin_va_arg.
Definition: Expr.h:4250
clang::ConstraintSatisfaction
The result of a constraint satisfaction check, containing the necessary information to diagnose an un...
Definition: ASTConcept.h:29
clang::NK_Type_Narrowing
A narrowing conversion by virtue of the source and destination types.
Definition: Overload.h:234
clang::Type::STK_BlockPointer
Definition: Type.h:2134
clang::ASTContext::getTrivialTypeSourceInfo
TypeSourceInfo * getTrivialTypeSourceInfo(QualType T, SourceLocation Loc=SourceLocation()) const
Allocate a TypeSourceInfo where all locations have been initialized to a given location, which defaults to the empty location.
Definition: ASTContext.cpp:2812
clang::TemplateArgument::getAsDecl
ValueDecl * getAsDecl() const
Retrieve the declaration for a declaration non-type template argument.
Definition: TemplateBase.h:263
clang::Sema::CTK_ErrorRecovery
Definition: Sema.h:3697
clang::Type::isSaturatedFixedPointType
bool isSaturatedFixedPointType() const
Return true if this is a saturated fixed point type according to ISO/IEC JTC1 SC22 WG14 N1169...
Definition: Type.h:6836
handleIntegerConversion
static QualType handleIntegerConversion(Sema &S, ExprResult &LHS, ExprResult &RHS, QualType LHSType, QualType RHSType, bool IsCompAssign)
Handle integer arithmetic conversions.
Definition: SemaExpr.cpp:1190
BuildCookedLiteralOperatorCall
static ExprResult BuildCookedLiteralOperatorCall(Sema &S, Scope *Scope, IdentifierInfo *UDSuffix, SourceLocation UDSuffixLoc, ArrayRef< Expr *> Args, SourceLocation LitEndLoc)
BuildCookedLiteralOperatorCall - A user-defined literal was found.
Definition: SemaExpr.cpp:1695
clang::ArrayType::Normal
Definition: Type.h:2896
diagnoseArithmeticOnVoidPointer
static void diagnoseArithmeticOnVoidPointer(Sema &S, SourceLocation Loc, Expr *Pointer)
Diagnose invalid arithmetic on a void pointer.
Definition: SemaExpr.cpp:9460
clang::ASTContext::getPromotedIntegerType
QualType getPromotedIntegerType(QualType PromotableType) const
Return the type that PromotableType will promote to: C99 6.3.1.1p2, assuming that PromotableType is a...
Definition: ASTContext.cpp:6009
clang::TypoCorrection::getAsString
std::string getAsString(const LangOptions &LO) const
Definition: SemaLookup.cpp:5180
clang::Sema::CheckLogicalOperands
QualType CheckLogicalOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, BinaryOperatorKind Opc)
Definition: SemaExpr.cpp:11456
clang::Expr::isSameComparisonOperand
static bool isSameComparisonOperand(const Expr *E1, const Expr *E2)
Checks that the two Expr&#39;s will refer to the same value as a comparison operand.
Definition: Expr.cpp:3985
Offset
unsigned Offset
Definition: Format.cpp:1827
clang::Lexer::getSourceText
static StringRef getSourceText(CharSourceRange Range, const SourceManager &SM, const LangOptions &LangOpts, bool *Invalid=nullptr)
Returns a string for the source that the range encompasses.
Definition: Lexer.cpp:939
clang::CharacterLiteral::getValue
unsigned getValue() const
Definition: Expr.h:1564
clang::Expr::HasSideEffects
bool HasSideEffects(const ASTContext &Ctx, bool IncludePossibleEffects=true) const
HasSideEffects - This routine returns true for all those expressions which have any effect other than...
Definition: Expr.cpp:3401
clang::Sema::ActOnCompoundLiteral
ExprResult ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty, SourceLocation RParenLoc, Expr *InitExpr)
Definition: SemaExpr.cpp:6157
clang::MultiLevelTemplateArgumentList::getInnermost
const ArgList & getInnermost() const
Retrieve the innermost template argument list.
Definition: Template.h:164
clang::OK_ObjCProperty
An Objective-C property is a logical field of an Objective-C object which is read and written via Obj...
Definition: Specifiers.h:151
clang::sema::CapturingScopeInfo::ImpCap_None
Definition: ScopeInfo.h:634
clang::runWithSufficientStackSpace
void runWithSufficientStackSpace(llvm::function_ref< void()> Diag, llvm::function_ref< void()> Fn)
Run a given function on a stack with "sufficient" space.
Definition: Stack.h:40
clang::Sema::DiagnoseAssignmentAsCondition
void DiagnoseAssignmentAsCondition(Expr *E)
DiagnoseAssignmentAsCondition - Given that an expression is being used as a boolean condition...
Definition: SemaExpr.cpp:17318
clang::TypeLoc::getBeginLoc
SourceLocation getBeginLoc() const
Get the begin source location.
Definition: TypeLoc.cpp:191
clang::Sema::ActOnBinOp
ExprResult ActOnBinOp(Scope *S, SourceLocation TokLoc, tok::TokenKind Kind, Expr *LHSExpr, Expr *RHSExpr)
Definition: SemaExpr.cpp:13405
clang::Sema::UsualArithmeticConversions
QualType UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, ArithConvKind ACK)
UsualArithmeticConversions - Performs various conversions that are common to binary operators (C99 6...
Definition: SemaExpr.cpp:1430
clang::StringLiteral::Create
static StringLiteral * Create(const ASTContext &Ctx, StringRef Str, StringKind Kind, bool Pascal, QualType Ty, const SourceLocation *Loc, unsigned NumConcatenated)
This is the "fully general" constructor that allows representation of strings formed from multiple co...
Definition: Expr.cpp:1084
clang::sema::BlockScopeInfo
Retains information about a block that is currently being parsed.
Definition: ScopeInfo.h:716
Designator.h
clang::sema::LambdaScopeInfo::CallOperator
CXXMethodDecl * CallOperator
The lambda&#39;s compiler-generated operator().
Definition: ScopeInfo.h:800
clang::ComplexType::getElementType
QualType getElementType() const
Definition: Type.h:2567
clang::CallExpr::Create
static CallExpr * Create(const ASTContext &Ctx, Expr *Fn, ArrayRef< Expr *> Args, QualType Ty, ExprValueKind VK, SourceLocation RParenLoc, unsigned MinNumArgs=0, ADLCallKind UsesADL=NotADL)
Create a call expression.
Definition: Expr.cpp:1384
clang::ValueDecl::isWeak
bool isWeak() const
Determine whether this symbol is weakly-imported, or declared with the weak or weak-ref attr...
Definition: Decl.cpp:4675
isPotentiallyConstantEvaluatedContext
static bool isPotentiallyConstantEvaluatedContext(Sema &SemaRef)
Are we in a context that is potentially constant evaluated per C++20 [expr.const]p12?
Definition: SemaExpr.cpp:15369
clang::DeclarationName::getCXXNameType
QualType getCXXNameType() const
If this name is one of the C++ names (of a constructor, destructor, or conversion function)...
Definition: DeclarationName.h:439
clang::ASTContext::getVectorType
QualType getVectorType(QualType VectorType, unsigned NumElts, VectorType::VectorKind VecKind) const
Return the unique reference to a vector type of the specified element type and size.
Definition: ASTContext.cpp:3647
clang::BlockDecl
Represents a block literal declaration, which is like an unnamed FunctionDecl.
Definition: Decl.h:4037
clang::sema::Capture::isInvalid
bool isInvalid() const
Definition: ScopeInfo.h:591
clang::Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed
The current expression is potentially evaluated, but any declarations referenced inside that expressi...
clang::PredefinedExpr::LFunction
Definition: Expr.h:1917
clang::ValueDecl
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:619
clang::Expr
This represents one expression.
Definition: Expr.h:108
End
SourceLocation End
Definition: USRLocFinder.cpp:166
clang::ConversionFixItGenerator::isNull
bool isNull()
Definition: SemaFixItUtils.h:84
clang::CharSourceRange
Represents a character-granular source range.
Definition: SourceLocation.h:250
clang::ExprValueKind
ExprValueKind
The categorization of expression values, currently following the C++11 scheme.
Definition: Specifiers.h:122
DiagnoseLogicalAndInLogicalOrLHS
static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc, Expr *LHSExpr, Expr *RHSExpr)
Look for &#39;&&&#39; in the left hand of a &#39;||&#39; expr.
Definition: SemaExpr.cpp:13274
clang::FunctionDecl::isVariadic
bool isVariadic() const
Whether this function is variadic.
Definition: Decl.cpp:2827
NCCK_None
Definition: SemaExpr.cpp:11572
clang::CallExpr::setCallee
void setCallee(Expr *F)
Definition: Expr.h:2665
clang::FunctionDecl::isDefaulted
bool isDefaulted() const
Whether this function is defaulted per C++0x.
Definition: Decl.h:2130
llvm::MutableArrayRef
Definition: LLVM.h:32
clang::FunctionDecl::isUserProvided
bool isUserProvided() const
True if this method is user-declared and was not deleted or defaulted on its first declaration...
Definition: Decl.h:2147
getParentOfCapturingContextOrNull
static DeclContext * getParentOfCapturingContextOrNull(DeclContext *DC, VarDecl *Var, SourceLocation Loc, const bool Diagnose, Sema &S)
Definition: SemaExpr.cpp:15864
Id
int Id
Definition: ASTDiff.cpp:190
clang::ObjCInterfaceDecl::ivar_begin
ivar_iterator ivar_begin() const
Definition: DeclObjC.h:1474
clang::VarDecl::hasLocalStorage
bool hasLocalStorage() const
Returns true if a variable with function scope is a non-static local variable.
Definition: Decl.h:1045
clang::AttributedType::getNullabilityAttrKind
static Kind getNullabilityAttrKind(NullabilityKind kind)
Retrieve the attribute kind corresponding to the given nullability kind.
Definition: Type.h:4606
clang::TargetInfo::getIntWidth
unsigned getIntWidth() const
getIntWidth/Align - Return the size of &#39;signed int&#39; and &#39;unsigned int&#39; for this target, in bits.
Definition: TargetInfo.h:396
EvaluatesAsTrue
static bool EvaluatesAsTrue(Sema &S, Expr *E)
Returns true if the given expression can be evaluated as a constant &#39;true&#39;.
Definition: SemaExpr.cpp:13259
clang::CPlusPlus
Definition: LangStandard.h:47
clang::DeclContext::containsDecl
bool containsDecl(Decl *D) const
Checks whether a declaration is in this context.
Definition: DeclBase.cpp:1401
clang::OverloadExpr::find
static FindResult find(Expr *E)
Finds the overloaded expression in the given expression E of OverloadTy.
Definition: ExprCXX.h:2904
clang::UnresolvedMemberExpr::isImplicitAccess
bool isImplicitAccess() const
True if this is an implicit access, i.e., one in which the member being accessed was not written in t...
Definition: ExprCXX.cpp:1531
clang::ObjCRuntime::allowsSizeofAlignof
bool allowsSizeofAlignof() const
Does this runtime allow sizeof or alignof on object types?
Definition: ObjCRuntime.h:315
clang::Sema::BuildCallExpr
ExprResult BuildCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc, MultiExprArg ArgExprs, SourceLocation RParenLoc, Expr *ExecConfig=nullptr, bool IsExecConfig=false)
BuildCallExpr - Handle a call to Fn with the specified array of arguments.
Definition: SemaExpr.cpp:5732
DeclSpec.h
This file defines the classes used to store parsed information about declaration-specifiers and decla...
clang::Type::isObjCBuiltinType
bool isObjCBuiltinType() const
Definition: Type.h:6669
clang::Type::castAs
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:7067
maybeDiagnoseAssignmentToFunction
static bool maybeDiagnoseAssignmentToFunction(Sema &S, QualType DstType, const Expr *SrcExpr)
Definition: SemaExpr.cpp:14743
clang::Sema::FindCompositePointerType
QualType FindCompositePointerType(SourceLocation Loc, Expr *&E1, Expr *&E2, bool ConvertArgs=true)
Find a merged pointer type and convert the two expressions to it.
Definition: SemaExprCXX.cpp:6265
clang::Sema::ActOnStmtExprResult
ExprResult ActOnStmtExprResult(ExprResult E)
Definition: SemaExpr.cpp:13955
clang::NOUR_Constant
This name appears as a potential result of an lvalue-to-rvalue conversion that is a constant expressi...
Definition: Specifiers.h:167
V
#define V(N, I)
Definition: ASTContext.h:2941
clang::BlockExpr
BlockExpr - Adaptor class for mixing a BlockDecl with expressions.
Definition: Expr.h:5585
clang::TypeLoc::getAs
T getAs() const
Convert to the specified TypeLoc type, returning a null TypeLoc if this TypeLoc is not of the desired...
Definition: TypeLoc.h:88
clang::CXXDestructorDecl
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2649
clang::ASTContext::OMPArraySectionTy
CanQualType OMPArraySectionTy
Definition: ASTContext.h:1055
clang::CallExpr::getCallee
Expr * getCallee()
Definition: Expr.h:2663
clang::Decl::setInvalidDecl
void setInvalidDecl(bool Invalid=true)
setInvalidDecl - Indicates the Decl had a semantic error.
Definition: DeclBase.cpp:132
clang::Sema::isOpenMPCapturedDecl
VarDecl * isOpenMPCapturedDecl(ValueDecl *D, bool CheckScopeInfo=false, unsigned StopAt=0)
Check if the specified variable is used in one of the private clauses (private, firstprivate, lastprivate, reduction etc.) in OpenMP constructs.
Definition: SemaOpenMP.cpp:1978
clang::DeclarationName::getAsString
std::string getAsString() const
Retrieve the human-readable string for this name.
Definition: DeclarationName.cpp:223
Lookup.h
clang::Decl::isImplicit
bool isImplicit() const
isImplicit - Indicates whether the declaration was implicitly generated by the implementation.
Definition: DeclBase.h:558
clang::Token::getLocation
SourceLocation getLocation() const
Return a source location identifier for the specified offset in the current file. ...
Definition: Token.h:126
clang::Expr::MLV_SubObjCPropertySetting
Definition: Expr.h:292
Preprocessor.h
Defines the clang::Preprocessor interface.
clang::OMF_dealloc
Definition: IdentifierTable.h:640
clang::Type::isNullPtrType
bool isNullPtrType() const
Definition: Type.h:6802
clang::Sema::VerifyIntegerConstantExpression
ExprResult VerifyIntegerConstantExpression(Expr *E, llvm::APSInt *Result, VerifyICEDiagnoser &Diagnoser, bool AllowFold=true)
VerifyIntegerConstantExpression - Verifies that an expression is an ICE, and reports the appropriate ...
Definition: SemaExpr.cpp:15012
clang::Sema::LK_String
Definition: Sema.h:3138
clang::CharLiteralParser
CharLiteralParser - Perform interpretation and semantic analysis of a character literal.
Definition: LiteralSupport.h:175
DelayedDiagnostic.h
Defines the classes clang::DelayedDiagnostic and clang::AccessedEntity.
bool
#define bool
Definition: stdbool.h:15
clang::MemberExpr::performsVirtualDispatch
bool performsVirtualDispatch(const LangOptions &LO) const
Returns true if virtual dispatch is performed.
Definition: Expr.h:3054
clang::Qualifiers::getObjCLifetime
ObjCLifetime getObjCLifetime() const
Definition: Type.h:333
clang::ConstantExpr::Create
static ConstantExpr * Create(const ASTContext &Context, Expr *E, const APValue &Result)
Definition: Expr.cpp:294
clang::Selector::getNameForSlot
StringRef getNameForSlot(unsigned argIndex) const
Retrieve the name at a given position in the selector.
Definition: IdentifierTable.cpp:452
clang::Sema::LookupIvarInObjCMethod
DeclResult LookupIvarInObjCMethod(LookupResult &Lookup, Scope *S, IdentifierInfo *II)
The parser has read a name in, and Sema has detected that we&#39;re currently inside an ObjC method...
Definition: SemaExpr.cpp:2605
clang::Type::isObjCClassType
bool isObjCClassType() const
Definition: Type.h:6657
DiagnoseShiftCompare
static void DiagnoseShiftCompare(Sema &S, SourceLocation OpLoc, Expr *LHSExpr, Expr *RHSExpr)
Definition: SemaExpr.cpp:13342
clang::CXXScopeSpec::getBeginLoc
SourceLocation getBeginLoc() const
Definition: DeclSpec.h:72
clang::Sema::ExpressionEvaluationContextRecord::SavedMaybeODRUseExprs
MaybeODRUseExprSet SavedMaybeODRUseExprs
Definition: Sema.h:1088
clang::Decl::getDeclContext
DeclContext * getDeclContext()
Definition: DeclBase.h:438
clang::ParenListExpr::getLParenLoc
SourceLocation getLParenLoc() const
Definition: Expr.h:5194
clang::StringLiteral::getCodeUnit
uint32_t getCodeUnit(size_t i) const
Definition: Expr.h:1809
clang::OR_Success
Overload resolution succeeded.
Definition: Overload.h:53
clang::ConstraintSatisfaction::IsSatisfied
bool IsSatisfied
Definition: ASTConcept.h:47
clang::ObjCObjectPointerType::isObjCIdType
bool isObjCIdType() const
True if this is equivalent to the &#39;id&#39; type, i.e.
Definition: Type.h:6013
clang::Type::isAnyComplexType
bool isAnyComplexType() const
Definition: Type.h:6602
isVector
static bool isVector(QualType QT, QualType ElementType)
This helper function returns true if QT is a vector type that has element type ElementType.
Definition: SemaExpr.cpp:8259
clang::UnaryOperator::getOverloadedOperator
static OverloadedOperatorKind getOverloadedOperator(Opcode Opc)
Retrieve the overloaded operator kind that corresponds to the given unary opcode. ...
Definition: Expr.cpp:1318
BuildOverloadedBinOp
static ExprResult BuildOverloadedBinOp(Sema &S, Scope *Sc, SourceLocation OpLoc, BinaryOperatorKind Opc, Expr *LHS, Expr *RHS)
Build an overloaded binary operator expression in the given scope.
Definition: SemaExpr.cpp:13419
clang::ObjCInterfaceDecl::getSuperClass
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:337
clang::CXXDependentScopeMemberExpr::Create
static CXXDependentScopeMemberExpr * Create(const ASTContext &Ctx, Expr *Base, QualType BaseType, bool IsArrow, SourceLocation OperatorLoc, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, NamedDecl *FirstQualifierFoundInScope, DeclarationNameInfo MemberNameInfo, const TemplateArgumentListInfo *TemplateArgs)
Definition: ExprCXX.cpp:1446
clang::Sema::DiagnoseAssignmentResult
bool DiagnoseAssignmentResult(AssignConvertType ConvTy, SourceLocation Loc, QualType DstType, QualType SrcType, Expr *SrcExpr, AssignmentAction Action, bool *Complained=nullptr)
DiagnoseAssignmentResult - Emit a diagnostic, if required, for the assignment conversion type specifi...
Definition: SemaExpr.cpp:14762
clang::CXXRecordDecl::hasAnyDependentBases
bool hasAnyDependentBases() const
Determine whether this class has any dependent base classes which are not the current instantiation...
Definition: DeclCXX.cpp:543
clang::ASTContext::ShortTy
CanQualType ShortTy
Definition: ASTContext.h:1025
clang::ASTMutationListener
An abstract interface that should be implemented by listeners that want to be notified when an AST en...
Definition: ASTMutationListener.h:46
clang::AsTypeExpr
AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] This AST node provides support ...
Definition: Expr.h:5648
diagnoseUncapturableValueReference
static void diagnoseUncapturableValueReference(Sema &S, SourceLocation loc, ValueDecl *var, DeclContext *DC)
Definition: SemaExpr.cpp:15791
Scope.h
clang::Sema::IncompatiblePointerDiscardsQualifiers
IncompatiblePointerDiscardsQualifiers - The assignment discards qualifiers that we don&#39;t permit to be...
Definition: Sema.h:10666
clang::Sema::CheckPlaceholderExpr
ExprResult CheckPlaceholderExpr(Expr *E)
Check for operands with placeholder types and complain if found.
Definition: SemaExpr.cpp:17992
clang::Type::getScalarTypeKind
ScalarTypeKind getScalarTypeKind() const
Given that this is a scalar type, classify it.
Definition: Type.cpp:2051
clang::CallExpr::getDirectCallee
FunctionDecl * getDirectCallee()
If the callee is a FunctionDecl, return it. Otherwise return null.
Definition: Expr.h:2681
clang::DeclRefExpr::refersToEnclosingVariableOrCapture
bool refersToEnclosingVariableOrCapture() const
Does this DeclRefExpr refer to an enclosing local or a captured variable?
Definition: Expr.h:1377
clang::FloatingLiteral::Create
static FloatingLiteral * Create(const ASTContext &C, const llvm::APFloat &V, bool isexact, QualType Type, SourceLocation L)
Definition: Expr.cpp:984
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Represents a C++ template name within the type system.
Definition: TemplateName.h:191
isMSPropertySubscriptExpr
static bool isMSPropertySubscriptExpr(Sema &S, Expr *Base)
Definition: SemaExpr.cpp:4442
clang::Sema::FullExprArg
Definition: Sema.h:4091
clang::Sema::RequireCompleteType
bool RequireCompleteType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Ensure that the type T is a complete type.
Definition: SemaType.cpp:7919
TypeLoc.h
Defines the clang::TypeLoc interface and its subclasses.
clang::ICK_Floating_Integral
Floating-integral conversions (C++ [conv.fpint])
Definition: Overload.h:143
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UnqualifiedIdKind getKind() const
Determine what kind of name we have.
Definition: DeclSpec.h:1042
clang::Sema::ExpressionEvaluationContext::Unevaluated
The current expression and its subexpressions occur within an unevaluated operand (C++11 [expr]p7)...
clang::Sema::DiscardCleanupsInEvaluationContext
void DiscardCleanupsInEvaluationContext()
Definition: SemaExpr.cpp:15349
clang::DeclarationName::getAsIdentifierInfo
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Retrieve the IdentifierInfo * stored in this declaration name, or null if this declaration name isn&#39;t...
Definition: DeclarationName.h:410
clang::Expr::NPC_ValueDependentIsNull
Specifies that a value-dependent expression of integral or dependent type should be considered a null...
Definition: Expr.h:739
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static bool checkForArray(const Expr *E)
Definition: SemaExpr.cpp:10399
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bool hasBody(const FunctionDecl *&Definition) const
Returns true if the function has a body.
Definition: Decl.cpp:2859
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QualType getType() const
Definition: Expr.h:137
clang::DeclContext::isFunctionOrMethod
bool isFunctionOrMethod() const
Definition: DeclBase.h:1836
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DefinitionKind hasDefinition(ASTContext &) const
Check whether this variable is defined in this translation unit.
Definition: Decl.cpp:2203
clang::LangOptions::LaxVectorConversionKind::All
Permit vector bitcasts between all vectors with the same total bit-width.
clang::Type::STK_Bool
Definition: Type.h:2137
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CleanupInfo ParentCleanup
Whether the enclosing context needed a cleanup.
Definition: Sema.h:1075
clang::sema::CapturingScopeInfo::getCapture
Capture & getCapture(VarDecl *Var)
Retrieve the capture of the given variable, if it has been captured already.
Definition: ScopeInfo.h:697
clang::ObjCInterfaceDecl::lookupInstanceVariable
ObjCIvarDecl * lookupInstanceVariable(IdentifierInfo *IVarName, ObjCInterfaceDecl *&ClassDeclared)
Definition: DeclObjC.cpp:620
clang::Sema::TooManyArguments
static bool TooManyArguments(size_t NumParams, size_t NumArgs, bool PartialOverloading=false)
To be used for checking whether the arguments being passed to function exceeds the number of paramete...
Definition: Sema.h:11968
clang::Expr::setValueKind
void setValueKind(ExprValueKind Cat)
setValueKind - Set the value kind produced by this expression.
Definition: Expr.h:431
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bool isSingleResult() const
Determines if this names a single result which is not an unresolved value using decl.
Definition: Lookup.h:308
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clang::ObjCRuntime ObjCRuntime
Definition: LangOptions.h:257
clang::transformer::remove
ASTEdit remove(RangeSelector S)
Removes the source selected by S.
Definition: RewriteRule.cpp:82
clang::DeclContext::getParent
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1784
clang::Sema::BuildLiteralOperatorCall
ExprResult BuildLiteralOperatorCall(LookupResult &R, DeclarationNameInfo &SuffixInfo, ArrayRef< Expr *> Args, SourceLocation LitEndLoc, TemplateArgumentListInfo *ExplicitTemplateArgs=nullptr)
BuildLiteralOperatorCall - Build a UserDefinedLiteral by creating a call to a literal operator descri...
Definition: SemaOverload.cpp:14460
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void setAddressSpace(LangAS space)
Definition: Type.h:379
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static PredefinedExpr * Create(const ASTContext &Ctx, SourceLocation L, QualType FNTy, IdentKind IK, StringLiteral *SL)
Create a PredefinedExpr.
Definition: Expr.cpp:633
clang::Sema::ConvertArgumentsForCall
bool ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, FunctionDecl *FDecl, const FunctionProtoType *Proto, ArrayRef< Expr *> Args, SourceLocation RParenLoc, bool ExecConfig=false)
ConvertArgumentsForCall - Converts the arguments specified in Args/NumArgs to the parameter types of ...
Definition: SemaExpr.cpp:5146
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ScalarTypeKind
Definition: Type.h:2132
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An expression that sends a message to the given Objective-C object or class.
Definition: ExprObjC.h:950
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Data structure that captures multiple levels of template argument lists for use in template instantia...
Definition: Template.h:64
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llvm::SmallPtrSet< const Expr *, 8 > PossibleDerefs
Definition: Sema.h:1107
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ConditionKind
Definition: Sema.h:11058
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bool isInvalid() const
Definition: Ownership.h:166
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static UnaryOperatorKind ConvertTokenKindToUnaryOpcode(tok::TokenKind Kind)
Definition: SemaExpr.cpp:12740
clang::Sema::OffsetOfComponent
Definition: Sema.h:4963
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SourceLocation getEnd() const
Definition: SourceLocation.h:217
clang::UnaryOperator
UnaryOperator - This represents the unary-expression&#39;s (except sizeof and alignof), the postinc/postdec operators from postfix-expression, and various extensions.
Definition: Expr.h:2046
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bool isInstanceMethod() const
Definition: DeclObjC.h:423
clang::ASTContext::getFunctionType
QualType getFunctionType(QualType ResultTy, ArrayRef< QualType > Args, const FunctionProtoType::ExtProtoInfo &EPI) const
Return a normal function type with a typed argument list.
Definition: ASTContext.h:1401
clang::Sema::getPreprocessor
Preprocessor & getPreprocessor() const
Definition: Sema.h:1358
clang::MemberExpr::getMemberLoc
SourceLocation getMemberLoc() const
getMemberLoc - Return the location of the "member", in X->F, it is the location of &#39;F&#39;...
Definition: Expr.h:3025
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Represents a GCC generic vector type.
Definition: Type.h:3235
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ArraySizeModifier getSizeModifier() const
Definition: Type.h:2912
clang::Sema::ActOnChooseExpr
ExprResult ActOnChooseExpr(SourceLocation BuiltinLoc, Expr *CondExpr, Expr *LHSExpr, Expr *RHSExpr, SourceLocation RPLoc)
Definition: SemaExpr.cpp:14168
clang::Expr::LV_MemberFunction
Definition: Expr.h:270
clang::CXXConversionDecl::isLambdaToBlockPointerConversion
bool isLambdaToBlockPointerConversion() const
Determine whether this conversion function is a conversion from a lambda closure type to a block poin...
Definition: DeclCXX.cpp:2699
clang::DeclContext::isDependentContext
bool isDependentContext() const
Determines whether this context is dependent on a template parameter.
Definition: DeclBase.cpp:1091
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void CleanupVarDeclMarking()
Definition: SemaExpr.cpp:16795
clang::sema::Capture
Definition: ScopeInfo.h:496
clang::Type::getAsPlaceholderType
const BuiltinType * getAsPlaceholderType() const
Definition: Type.h:6757
ASTConsumer.h
clang::DeclRefExpr::getDecl
ValueDecl * getDecl()
Definition: Expr.h:1247
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bool isUsable() const
Definition: Ownership.h:167
clang::CXXConversionDecl
Represents a C++ conversion function within a class.
Definition: DeclCXX.h:2713
RecursiveASTVisitor.h
clang::ASTContext::getTypeDeclType
QualType getTypeDeclType(const TypeDecl *Decl, const TypeDecl *PrevDecl=nullptr) const
Return the unique reference to the type for the specified type declaration.
Definition: ASTContext.h:1417
clang::TSK_ImplicitInstantiation
This template specialization was implicitly instantiated from a template.
Definition: Specifiers.h:181
clang::FunctionDecl::isTrivial
bool isTrivial() const
Whether this function is "trivial" in some specialized C++ senses.
Definition: Decl.h:2122
clang::QualType::hasNonTrivialToPrimitiveDefaultInitializeCUnion
bool hasNonTrivialToPrimitiveDefaultInitializeCUnion() const
Check if this is or contains a C union that is non-trivial to default-initialize, which is a union th...
Definition: Type.h:6386
clang::Sema::LookupSingleName
NamedDecl * LookupSingleName(Scope *S, DeclarationName Name, SourceLocation Loc, LookupNameKind NameKind, RedeclarationKind Redecl=NotForRedeclaration)
Look up a name, looking for a single declaration.
Definition: SemaLookup.cpp:3049
clang::PredefinedExpr::IdentKind
IdentKind
Definition: Expr.h:1914
clang::CXXDeleteExpr::getDestroyedType
QualType getDestroyedType() const
Retrieve the type being destroyed.
Definition: ExprCXX.cpp:301
clang::ParenExpr::getSubExpr
const Expr * getSubExpr() const
Definition: Expr.h:2010
clang::CXXBindTemporaryExpr::getSubExpr
const Expr * getSubExpr() const
Definition: ExprCXX.h:1396
clang::sema::CapturedRegionScopeInfo::CapRegionKind
unsigned short CapRegionKind
The kind of captured region.
Definition: ScopeInfo.h:757
clang::sema::Capture::getLocation
SourceLocation getLocation() const
Retrieve the location at which this variable was captured.
Definition: ScopeInfo.h:616
clang::Sema::BuildCompoundLiteralExpr
ExprResult BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo, SourceLocation RParenLoc, Expr *LiteralExpr)
Definition: SemaExpr.cpp:6171
clang::QualType::isNull
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:719
clang::ObjCMethodDecl::getSelfDecl
ImplicitParamDecl * getSelfDecl() const
Definition: DeclObjC.h:415
clang::BlockDecl::setBlockMangling
void setBlockMangling(unsigned Number, Decl *Ctx)
Definition: Decl.h:4207
clang::Qualifiers::removeCVRQualifiers
void removeCVRQualifiers(unsigned mask)
Definition: Type.h:283
clang::Sema::checkDeclIsAllowedInOpenMPTarget
void checkDeclIsAllowedInOpenMPTarget(Expr *E, Decl *D, SourceLocation IdLoc=SourceLocation())
Check declaration inside target region.
Definition: SemaOpenMP.cpp:16929
clang::isTemplateInstantiation
bool isTemplateInstantiation(TemplateSpecializationKind Kind)
Determine whether this template specialization kind refers to an instantiation of an entity (as oppos...
Definition: Specifiers.h:199
ConstMethod
Definition: SemaExpr.cpp:11622
checkArgsForPlaceholders
static bool checkArgsForPlaceholders(Sema &S, MultiExprArg args)
Check an argument list for placeholders that we won&#39;t try to handle later.
Definition: SemaExpr.cpp:5498
clang::CallingConv
CallingConv
CallingConv - Specifies the calling convention that a function uses.
Definition: Specifiers.h:265
clang::TypeLoc::getAsAdjusted
T getAsAdjusted() const
Convert to the specified TypeLoc type, returning a null TypeLoc if this TypeLoc is not of the desired...
Definition: TypeLoc.h:2435
OEK_LValue
Definition: SemaExpr.cpp:11753
hasAnyExplicitStorageClass
static bool hasAnyExplicitStorageClass(const FunctionDecl *D)
Determine whether a FunctionDecl was ever declared with an explicit storage class.
Definition: SemaExpr.cpp:124
clang::VarDecl::getCanonicalDecl
VarDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: Decl.cpp:2088
CorrectDelayedTyposInBinOp
static std::pair< ExprResult, ExprResult > CorrectDelayedTyposInBinOp(Sema &S, BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr)
Definition: SemaExpr.cpp:12887
clang::CXXOperatorCallExpr::getSourceRange
SourceRange getSourceRange() const
Definition: ExprCXX.h:141
clang::ImaginaryLiteral
ImaginaryLiteral - We support imaginary integer and floating point literals, like "1...
Definition: Expr.h:1662
clang::Sema::BuildInitList
ExprResult BuildInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList, SourceLocation RBraceLoc)
Definition: SemaExpr.cpp:6338
clang::Redeclarable::getFirstDecl
decl_type * getFirstDecl()
Return the first declaration of this declaration or itself if this is the only declaration.
Definition: Redeclarable.h:215
clang::Sema::ActOnSourceLocExpr
ExprResult ActOnSourceLocExpr(SourceLocExpr::IdentKind Kind, SourceLocation BuiltinLoc, SourceLocation RPLoc)
Definition: SemaExpr.cpp:14694
clang::Sema::LookupDestructor
CXXDestructorDecl * LookupDestructor(CXXRecordDecl *Class)
Look for the destructor of the given class.
Definition: SemaLookup.cpp:3392
clang::Stmt::getEndLoc
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Stmt.cpp:288
clang::Builtin::Context::hasPtrArgsOrResult
bool hasPtrArgsOrResult(unsigned ID) const
Determines whether this builtin has a result or any arguments which are pointer types.
Definition: Builtins.h:163
clang::InitializationKind::CreateCopy
static InitializationKind CreateCopy(SourceLocation InitLoc, SourceLocation EqualLoc, bool AllowExplicitConvs=false)
Create a copy initialization.
Definition: Initialization.h:648
DiagnoseCalleeStaticArrayParam
static void DiagnoseCalleeStaticArrayParam(Sema &S, ParmVarDecl *PVD)
Definition: SemaExpr.cpp:5368
clang::Expr::getObjectKind
ExprObjectKind getObjectKind() const
getObjectKind - The object kind that this expression produces.
Definition: Expr.h:421
clang::NK_Variable_Narrowing
A narrowing conversion, because a non-constant-expression variable might have got narrowed...
Definition: Overload.h:241
isPlaceholderToRemoveAsArg
static bool isPlaceholderToRemoveAsArg(QualType type)
Is the given type a placeholder that we need to lower out immediately during argument processing...
Definition: SemaExpr.cpp:5444
clang::Type::isSignedFixedPointType
bool isSignedFixedPointType() const
Return true if this is a fixed point type that is signed according to ISO/IEC JTC1 SC22 WG14 N1169...
Definition: Type.h:6848
clang::LookupResult::isUnresolvableResult
bool isUnresolvableResult() const
Definition: Lookup.h:317
clang::CharSourceRange::getCharRange
static CharSourceRange getCharRange(SourceRange R)
Definition: SourceLocation.h:262
clang::ASTContext::getAttributedType
QualType getAttributedType(attr::Kind attrKind, QualType modifiedType, QualType equivalentType)
Definition: ASTContext.cpp:4195
clang::FunctionType::ExtInfo::withNoReturn
ExtInfo withNoReturn(bool noReturn) const
Definition: Type.h:3604
clang::ICK_Lvalue_To_Rvalue
Lvalue-to-rvalue conversion (C++ [conv.lval])
Definition: Overload.h:110
clang::QualType::isConstQualified
bool isConstQualified() const
Determine whether this type is const-qualified.
Definition: Type.h:6315
clang::Type::isVoidPointerType
bool isVoidPointerType() const
Definition: Type.cpp:521
clang::Sema::ActOnParenExpr
ExprResult ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E)
Definition: SemaExpr.cpp:3848
clang::Sema::areLaxCompatibleVectorTypes
bool areLaxCompatibleVectorTypes(QualType srcType, QualType destType)
Are the two types lax-compatible vector types? That is, given that one of them is a vector...
Definition: SemaExpr.cpp:6629
clang::FunctionProtoType::ExtProtoInfo::HasTrailingReturn
bool HasTrailingReturn
Definition: Type.h:3840
clang::BinaryOperator::isComparisonOp
bool isComparisonOp() const
Definition: Expr.h:3525
clang::StandardConversionSequence::getNarrowingKind
NarrowingKind getNarrowingKind(ASTContext &Context, const Expr *Converted, APValue &ConstantValue, QualType &ConstantType, bool IgnoreFloatToIntegralConversion=false) const
Check if this standard conversion sequence represents a narrowing conversion, according to C++11 [dcl...
Definition: SemaOverload.cpp:307
diagnoseAddressOfInvalidType
static void diagnoseAddressOfInvalidType(Sema &S, SourceLocation Loc, Expr *E, unsigned Type)
Diagnose invalid operand for address of operations.
Definition: SemaExpr.cpp:12391
clang::RecordType::getDecl
RecordDecl * getDecl() const
Definition: Type.h:4505
clang::CXXOperatorCallExpr::getOperatorLoc
SourceLocation getOperatorLoc() const
Returns the location of the operator symbol in the expression.
Definition: ExprCXX.h:129
clang::CXXScopeSpec::getScopeRep
NestedNameSpecifier * getScopeRep() const
Retrieve the representation of the nested-name-specifier.
Definition: DeclSpec.h:76
MarkExprReferenced
static void MarkExprReferenced(Sema &SemaRef, SourceLocation Loc, Decl *D, Expr *E, bool MightBeOdrUse)
Definition: SemaExpr.cpp:16999
clang::BinaryOperator::isBitwiseOp
static bool isBitwiseOp(Opcode Opc)
Definition: Expr.h:3515
clang::TargetInfo::useFP16ConversionIntrinsics
virtual bool useFP16ConversionIntrinsics() const
Check whether llvm intrinsics such as llvm.convert.to.fp16 should be used to convert to and from __fp...
Definition: TargetInfo.h:754
clang::ASTContext::getWideCharType
QualType getWideCharType() const
Return the type of wide characters.
Definition: ASTContext.h:1590
clang::BinaryOperator::getOverloadedOpcode
static Opcode getOverloadedOpcode(OverloadedOperatorKind OO)
Retrieve the binary opcode that corresponds to the given overloaded operator.
Definition: Expr.cpp:2056
clang::ObjCIvarDecl::Private
Definition: DeclObjC.h:1964
checkConditionalObjectPointersCompatibility
static QualType checkConditionalObjectPointersCompatibility(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc)
Return the resulting type when the operands are both pointers.
Definition: SemaExpr.cpp:7198
clang::ArrayTypeLoc
Wrapper for source info for arrays.
Definition: TypeLoc.h:1484
captureInLambda
static bool captureInLambda(LambdaScopeInfo *LSI, VarDecl *Var, SourceLocation Loc, const bool BuildAndDiagnose, QualType &CaptureType, QualType &DeclRefType, const bool RefersToCapturedVariable, const Sema::TryCaptureKind Kind, SourceLocation EllipsisLoc, const bool IsTopScope, Sema &S, bool Invalid)
Capture the given variable in the lambda.
Definition: SemaExpr.cpp:16058
clang::Expr::IgnoreConversionOperator
Expr * IgnoreConversionOperator() LLVM_READONLY
Skip conversion operators.
Definition: Expr.cpp:3004
clang::TargetInfo::getIntMaxTWidth
unsigned getIntMaxTWidth() const
Return the size of intmax_t and uintmax_t for this target, in bits.
Definition: TargetInfo.h:661
clang::Expr::EvaluateAsRValue
bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx, bool InConstantContext=false) const
EvaluateAsRValue - Return true if this is a constant which we can fold to an rvalue using any crazy t...
Definition: ExprConstant.cpp:13752
clang::ASTContext::OverloadTy
CanQualType OverloadTy
Definition: ASTContext.h:1045
checkArithmeticIncompletePointerType
static bool checkArithmeticIncompletePointerType(Sema &S, SourceLocation Loc, Expr *Operand)
Emit error if Operand is incomplete pointer type.
Definition: SemaExpr.cpp:9514
clang::OpaqueValueExpr
OpaqueValueExpr - An expression referring to an opaque object of a fixed type and value class...
Definition: Expr.h:1075
clang::ASTContext::getBuiltinMSVaListType
QualType getBuiltinMSVaListType() const
Retrieve the type of the __builtin_ms_va_list type.
Definition: ASTContext.h:1943
clang::ICK_Integral_Conversion
Integral conversions (C++ [conv.integral])
Definition: Overload.h:134
clang::OverloadCandidateSet::iterator
SmallVectorImpl< OverloadCandidate >::iterator iterator
Definition: Overload.h:1053
clang::ASTContext::getObjCIdRedefinitionType
QualType getObjCIdRedefinitionType() const
Retrieve the type that id has been defined to, which may be different from the built-in id if id has ...
Definition: ASTContext.h:1661
clang::Sema::MaybeBindToTemporary
ExprResult MaybeBindToTemporary(Expr *E)
MaybeBindToTemporary - If the passed in expression has a record type with a non-trivial destructor...
Definition: SemaExprCXX.cpp:6598
clang::ASTContext::BuiltinFnTy
CanQualType BuiltinFnTy
Definition: ASTContext.h:1046
clang::Qualifiers::OCL_Strong
Assigning into this object requires the old value to be released and the new value to be retained...
Definition: Type.h:171
AnalysisBasedWarnings.h
Kind
Kind
Definition: ChrootChecker.cpp:29
clang::OverloadExpr
A reference to an overloaded function set, either an UnresolvedLookupExpr or an UnresolvedMemberExpr...
Definition: ExprCXX.h:2844
clang::ImplicitConversionSequence
ImplicitConversionSequence - Represents an implicit conversion sequence, which may be a standard conv...
Definition: Overload.h:513
clang::getRewrittenOverloadedOperator
OverloadedOperatorKind getRewrittenOverloadedOperator(OverloadedOperatorKind Kind)
Get the other overloaded operator that the given operator can be rewritten into, if any such operator...
Definition: OperatorKinds.h:36
clang::QualType::getCanonicalType
QualType getCanonicalType() const
Definition: Type.h:6295
clang::Sema::CheckCaseExpression
bool CheckCaseExpression(Expr *E)
Definition: SemaExpr.cpp:18102
clang::VectorType::GenericVector
not a target-specific vector type
Definition: Type.h:3239
clang::ActionResult
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:153
clang::Sema::LookupInObjCMethod
ExprResult LookupInObjCMethod(LookupResult &LookUp, Scope *S, IdentifierInfo *II, bool AllowBuiltinCreation=false)
The parser has read a name in, and Sema has detected that we&#39;re currently inside an ObjC method...
Definition: SemaExpr.cpp:2743
clang::PseudoObjectExpr
PseudoObjectExpr - An expression which accesses a pseudo-object l-value.
Definition: Expr.h:5721
clang::FunctionProtoType::param_types
param_type_range param_types() const
Definition: Type.h:4119
clang::Sema::InstantiatingTemplate
A stack object to be created when performing template instantiation.
Definition: Sema.h:8275
clang::FunctionProtoType::getExtParameterInfo
ExtParameterInfo getExtParameterInfo(unsigned I) const
Definition: Type.h:4167
clang::sema::Capture::getVariable
VarDecl * getVariable() const
Definition: ScopeInfo.h:605
clang::FunctionProtoType::getExtProtoInfo
ExtProtoInfo getExtProtoInfo() const
Definition: Type.h:3975
clang::Expr::MLV_NotObjectType
Definition: Expr.h:280
clang::Sema::getASTContext
ASTContext & getASTContext() const
Definition: Sema.h:1359
clang::LangOptions::LaxVectorConversionKind::None
Permit no implicit vector bitcasts.
clang::Redeclarable::redecls
redecl_range redecls() const
Returns an iterator range for all the redeclarations of the same decl.
Definition: Redeclarable.h:294
clang::Sema::runWithSufficientStackSpace
void runWithSufficientStackSpace(SourceLocation Loc, llvm::function_ref< void()> Fn)
Run some code with "sufficient" stack space.
Definition: Sema.cpp:423
clang::ParenListExpr::getNumExprs
unsigned getNumExprs() const
Return the number of expressions in this paren list.
Definition: Expr.h:5175
clang::LangAS::Default
clang::Expr::isNullPointerConstant
NullPointerConstantKind isNullPointerConstant(ASTContext &Ctx, NullPointerConstantValueDependence NPC) const
isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to a Null pointer constant...
Definition: Expr.cpp:3743
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:86
clang::Sema::ActOnConvertVectorExpr
ExprResult ActOnConvertVectorExpr(Expr *E, ParsedType ParsedDestTy, SourceLocation BuiltinLoc, SourceLocation RParenLoc)
__builtin_convertvector(...)
Definition: SemaExpr.cpp:5895
clang::FunctionType::getReturnType
QualType getReturnType() const
Definition: Type.h:3680
clang::IdentifierTable::get
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
Definition: IdentifierTable.h:529
clang::NumericLiteralParser::GetFloatValue
llvm::APFloat::opStatus GetFloatValue(llvm::APFloat &Result)
GetFloatValue - Convert this numeric literal to a floating value, using the specified APFloat fltSema...
Definition: LiteralSupport.cpp:1040
clang::Expr::MLV_ConstQualifiedField
Definition: Expr.h:287
clang::EnumType
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of enums...
Definition: Type.h:4521
clang::BinaryOperator::getOperatorLoc
SourceLocation getOperatorLoc() const
Definition: Expr.h:3466
APSInt
llvm::APSInt APSInt
Definition: ByteCodeEmitter.cpp:18
clang::Sema::PrepareCastToObjCObjectPointer
CastKind PrepareCastToObjCObjectPointer(ExprResult &E)
Prepare a conversion of the given expression to an ObjC object pointer type.
Definition: SemaExpr.cpp:6379
clang::QualType::getAddressSpace
LangAS getAddressSpace() const
Return the address space of this type.
Definition: Type.h:6377
clang::OMPDeclareReductionDecl
This represents &#39;#pragma omp declare reduction ...&#39; directive.
Definition: DeclOpenMP.h:102
clang::DependentScopeDeclRefExpr::Create
static DependentScopeDeclRefExpr * Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, const DeclarationNameInfo &NameInfo, const TemplateArgumentListInfo *TemplateArgs)
Definition: ExprCXX.cpp:556
clang::Expr::NPCK_NotNull
Expression is not a Null pointer constant.
Definition: Expr.h:712
clang::QualType::getSingleStepDesugaredType
QualType getSingleStepDesugaredType(const ASTContext &Context) const
Return the specified type with one level of "sugar" removed from the type.
Definition: Type.h:967
clang::Sema::isValidVarArgType
VarArgKind isValidVarArgType(const QualType &Ty)
Determine the degree of POD-ness for an expression.
Definition: SemaExpr.cpp:826
clang::UnaryOperator::getSubExpr
Expr * getSubExpr() const
Definition: Expr.h:2076
clang::ObjCInterfaceType
Interfaces are the core concept in Objective-C for object oriented design.
Definition: Type.h:5894
SuggestParentheses
static void SuggestParentheses(Sema &Self, SourceLocation Loc, const PartialDiagnostic &Note, SourceRange ParenRange)
SuggestParentheses - Emit a note with a fixit hint that wraps ParenRange in parentheses.
Definition: SemaExpr.cpp:7729
clang::Type::isVariablyModifiedType
bool isVariablyModifiedType() const
Whether this type is a variably-modified type (C99 6.7.5).
Definition: Type.h:2166
clang::sema::LambdaScopeInfo::Lambda
CXXRecordDecl * Lambda
The class that describes the lambda.
Definition: ScopeInfo.h:797
clang::ASTContext::getObjCSelRedefinitionType
QualType getObjCSelRedefinitionType() const
Retrieve the type that &#39;SEL&#39; has been defined to, which may be different from the built-in &#39;SEL&#39; if &#39;...
Definition: ASTContext.h:1687
clang::FunctionType::ExtParameterInfo::isNoEscape
bool isNoEscape() const
Definition: Type.h:3487
CheckCommaOperands
static QualType CheckCommaOperands(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc)
Definition: SemaExpr.cpp:12196
checkArithmeticOrEnumeralCompare
static QualType checkArithmeticOrEnumeralCompare(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, BinaryOperatorKind Opc)
Definition: SemaExpr.cpp:10702
clang::Sema::ConversionToObjCStringLiteralCheck
bool ConversionToObjCStringLiteralCheck(QualType DstType, Expr *&SrcExpr, bool Diagnose=true)
Definition: SemaExpr.cpp:14708
captureInCapturedRegion
static bool captureInCapturedRegion(CapturedRegionScopeInfo *RSI, VarDecl *Var, SourceLocation Loc, const bool BuildAndDiagnose, QualType &CaptureType, QualType &DeclRefType, const bool RefersToCapturedVariable, Sema &S, bool Invalid)
Capture the given variable in the captured region.
Definition: SemaExpr.cpp:16021
clang::Type::getAsComplexIntegerType
const ComplexType * getAsComplexIntegerType() const
Definition: Type.cpp:550
clang::CastExpr::getCastKind
CastKind getCastKind() const
Definition: Expr.h:3196
clang::LangOptions::FPR_ToNearest
Rounding to nearest, corresponds to "round.tonearest".
Definition: LangOptions.h:200
clang::CSK_unspecified
Definition: Specifiers.h:33
clang::Expr::MLV_NoSetterProperty
Definition: Expr.h:290
MarkVarDeclODRUsed
static void MarkVarDeclODRUsed(VarDecl *Var, SourceLocation Loc, Sema &SemaRef, const unsigned *const FunctionScopeIndexToStopAt=nullptr)
Directly mark a variable odr-used.
Definition: SemaExpr.cpp:15760
clang::CXXNewExpr
Represents a new-expression for memory allocation and constructor calls, e.g: "new CXXNewExpr(foo)"...
Definition: ExprCXX.h:2100
clang::CXXNewExpr::getBeginLoc
SourceLocation getBeginLoc() const
Definition: ExprCXX.h:2339
getPrimaryDecl
static ValueDecl * getPrimaryDecl(Expr *E)
getPrimaryDecl - Helper function for CheckAddressOfOperand().
Definition: SemaExpr.cpp:12334
warnOnSizeofOnArrayDecay
static void warnOnSizeofOnArrayDecay(Sema &S, SourceLocation Loc, QualType T, Expr *E)
Check whether E is a pointer from a decayed array type (the decayed pointer type is equal to T) and e...
Definition: SemaExpr.cpp:3919
clang::Sema::ArithConvKind
ArithConvKind
Context in which we&#39;re performing a usual arithmetic conversion.
Definition: Sema.h:10607
clang::DeclarationNameInfo::getName
DeclarationName getName() const
getName - Returns the embedded declaration name.
Definition: DeclarationName.h:713
IgnoreCommaOperand
static bool IgnoreCommaOperand(const Expr *E)
Definition: SemaExpr.cpp:12126
clang::ASTContext::CreateTypeSourceInfo
TypeSourceInfo * CreateTypeSourceInfo(QualType T, unsigned Size=0) const
Allocate an uninitialized TypeSourceInfo.
Definition: ASTContext.cpp:2798
clang::TargetInfo::getLongLongWidth
unsigned getLongLongWidth() const
getLongLongWidth/Align - Return the size of &#39;signed long long&#39; and &#39;unsigned long long&#39; for this targ...
Definition: TargetInfo.h:406
clang::VectorType::getElementType
QualType getElementType() const
Definition: Type.h:3270
clang::Decl::setReferenced
void setReferenced(bool R=true)
Definition: DeclBase.h:588
clang::LabelDecl
Represents the declaration of a label.
Definition: Decl.h:451
clang::Sema::IncompatiblePointer
IncompatiblePointer - The assignment is between two pointers types that are not compatible, but we accept them as an extension.
Definition: Sema.h:10651
clang::CC_X86FastCall
Definition: Specifiers.h:268
clang::Sema::ActOnCharacterConstant
ExprResult ActOnCharacterConstant(const Token &Tok, Scope *UDLScope=nullptr)
Definition: SemaExpr.cpp:3388
clang::Sema::ActOnStmtExpr
ExprResult ActOnStmtExpr(Scope *S, SourceLocation LPLoc, Stmt *SubStmt, SourceLocation RPLoc)
Definition: SemaExpr.cpp:13911
clang::LookupResult::isOverloadedResult
bool isOverloadedResult() const
Determines if the results are overloaded.
Definition: Lookup.h:313
clang::ExprObjectKind
ExprObjectKind
A further classification of the kind of object referenced by an l-value or x-value.
Definition: Specifiers.h:139
clang::Sema::isExternalWithNoLinkageType
bool isExternalWithNoLinkageType(ValueDecl *VD)
Determine if VD, which must be a variable or function, is an external symbol that nonetheless can&#39;t b...
Definition: Sema.cpp:672
clang::ASTContext::getBaseElementType
QualType getBaseElementType(const ArrayType *VAT) const
Return the innermost element type of an array type.
Definition: ASTContext.cpp:5818
clang::PartialDiagnosticAt
std::pair< SourceLocation, PartialDiagnostic > PartialDiagnosticAt
A partial diagnostic along with the source location where this diagnostic occurs. ...
Definition: PartialDiagnostic.h:418
clang::OffsetOfExpr::Create
static OffsetOfExpr * Create(const ASTContext &C, QualType type, SourceLocation OperatorLoc, TypeSourceInfo *tsi, ArrayRef< OffsetOfNode > comps, ArrayRef< Expr *> exprs, SourceLocation RParenLoc)
Definition: Expr.cpp:1550
clang::Type::isIntegralType
bool isIntegralType(const ASTContext &Ctx) const
Determine whether this type is an integral type.
Definition: Type.cpp:1844
clang::CXXMethodDecl
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1931
clang::prec::Shift
Definition: OperatorPrecedence.h:39
Initialization.h
convertVector
static ExprResult convertVector(Expr *E, QualType ElementType, Sema &S)
Convert vector E to a vector with the same number of elements but different element type...
Definition: SemaExpr.cpp:8948
clang::Token::setIdentifierInfo
void setIdentifierInfo(IdentifierInfo *II)
Definition: Token.h:188
clang::PredefinedExpr::FuncSig
Definition: Expr.h:1919
clang::ASTContext::getAsConstantArrayType
const ConstantArrayType * getAsConstantArrayType(QualType T) const
Definition: ASTContext.h:2466
clang::OverloadExpr::FindResult
Definition: ExprCXX.h:2893
clang::Sema::TransformToPotentiallyEvaluated
ExprResult TransformToPotentiallyEvaluated(Expr *E)
Definition: SemaExpr.cpp:15190
clang::ASTContext::getExtVectorType
QualType getExtVectorType(QualType VectorType, unsigned NumElts) const
Return the unique reference to an extended vector type of the specified element type and size...
Definition: ASTContext.cpp:3718
clang::PredefinedExpr::ComputeName
static std::string ComputeName(IdentKind IK, const Decl *CurrentDecl)
Definition: Expr.cpp:673
clang::StmtVisitor
StmtVisitor - This class implements a simple visitor for Stmt subclasses.
Definition: StmtVisitor.h:183
clang::ASTContext::getNameForTemplate
DeclarationNameInfo getNameForTemplate(TemplateName Name, SourceLocation NameLoc) const
Definition: ASTContext.cpp:5498
clang::NestedNameSpecifier
Represents a C++ nested name specifier, such as "\::std::vector<int>::".
Definition: NestedNameSpecifier.h:48
clang::Sema::DefaultLvalueConversion
ExprResult DefaultLvalueConversion(Expr *E)
Definition: SemaExpr.cpp:590
clang::InitializedEntity::InitializeCompoundLiteralInit
static InitializedEntity InitializeCompoundLiteralInit(TypeSourceInfo *TSI)
Create the entity for a compound literal initializer.
Definition: Initialization.h:398
clang::ASTContext::FloatTy
CanQualType FloatTy
Definition: ASTContext.h:1028
clang::FunctionDecl::getParamDecl
const ParmVarDecl * getParamDecl(unsigned i) const
Definition: Decl.h:2422
clang::OverloadExpr::FindResult::IsAddressOfOperand
bool IsAddressOfOperand
Definition: ExprCXX.h:2895
clang::ASTContext::getAsArrayType
const ArrayType * getAsArrayType(QualType T) const
Type Query functions.
Definition: ASTContext.cpp:5707
clang::Sema::TryCapture_ExplicitByRef
Definition: Sema.h:4508
clang::Sema::ActOnInitList
ExprResult ActOnInitList(SourceLocation LBraceLoc, MultiExprArg InitArgList, SourceLocation RBraceLoc)
Definition: SemaExpr.cpp:6270
clang::Expr::NPC_ValueDependentIsNotNull
Specifies that a value-dependent expression should be considered to never be a null pointer constant...
Definition: Expr.h:743
clang::OverloadCandidateSet::BestViableFunction
OverloadingResult BestViableFunction(Sema &S, SourceLocation Loc, OverloadCandidateSet::iterator &Best)
Find the best viable function on this overload set, if it exists.
Definition: SemaOverload.cpp:9744
clang::ASTContext::VoidTy
CanQualType VoidTy
Definition: ASTContext.h:1016
Paren
Definition: PPMacroExpansion.cpp:629
CheckBoolLikeConversion
static void CheckBoolLikeConversion(Sema &S, Expr *E, SourceLocation CC)
Check conversion of given expression to boolean.
Definition: SemaChecking.cpp:12115
clang::tok::TokenKind
TokenKind
Provides a simple uniform namespace for tokens from all C languages.
Definition: TokenKinds.h:24
clang::ParenListExpr::getExpr
Expr * getExpr(unsigned Init)
Definition: Expr.h:5177
clang::SourceManager::isInMainFile
bool isInMainFile(SourceLocation Loc) const
Returns whether the PresumedLoc for a given SourceLocation is in the main file.
Definition: SourceManager.cpp:1519
clang::InitializationKind
Describes the kind of initialization being performed, along with location information for tokens rela...
Definition: Initialization.h:541
clang::Expr::isValueDependent
bool isValueDependent() const
isValueDependent - Determines whether this expression is value-dependent (C++ [temp.dep.constexpr]).
Definition: Expr.h:158
clang::VarTemplateSpecializationDecl::getTemplateArgsInfo
const TemplateArgumentListInfo & getTemplateArgsInfo() const
Definition: DeclTemplate.h:2751
clang::CharacterLiteral::UTF8
Definition: Expr.h:1535
clang::Sema::CorrectTypo
TypoCorrection CorrectTypo(const DeclarationNameInfo &Typo, Sema::LookupNameKind LookupKind, Scope *S, CXXScopeSpec *SS, CorrectionCandidateCallback &CCC, CorrectTypoKind Mode, DeclContext *MemberContext=nullptr, bool EnteringContext=false, const ObjCObjectPointerType *OPT=nullptr, bool RecordFailure=true)
Try to "correct" a typo in the source code by finding visible declarations whose names are similar to...
Definition: SemaLookup.cpp:4999
clang::Sema::ACK_CompAssign
A compound assignment expression.
Definition: Sema.h:10617
clang::StringLiteral::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:1886
clang::Qualifiers::withoutObjCLifetime
Qualifiers withoutObjCLifetime() const
Definition: Type.h:321
clang::Sema::CheckTransparentUnionArgumentConstraints
AssignConvertType CheckTransparentUnionArgumentConstraints(QualType ArgType, ExprResult &RHS)
Definition: SemaExpr.cpp:8614
clang::ASTContext::Float16Ty
CanQualType Float16Ty
Definition: ASTContext.h:1041
llvm::SmallVector
Definition: LLVM.h:35
clang::Type::isAnyPointerType
bool isAnyPointerType() const
Definition: Type.h:6508
clang::Type::isObjCObjectPointerType
bool isObjCObjectPointerType() const
Definition: Type.h:6618
clang::Sema::MarkFunctionParmPackReferenced
void MarkFunctionParmPackReferenced(FunctionParmPackExpr *E)
Perform reference-marking and odr-use handling for a FunctionParmPackExpr.
Definition: SemaExpr.cpp:17066
clang::Sema::TryCapture_Implicit
Definition: Sema.h:4508
clang::VarDecl::DeclarationOnly
This declaration is only a declaration.
Definition: Decl.h:1156
clang::VectorType::AltiVecBool
is AltiVec &#39;vector bool ...&#39;
Definition: Type.h:3248
clang::sema::CapturingScopeInfo::Captures
SmallVector< Capture, 4 > Captures
Captures - The captures.
Definition: ScopeInfo.h:651
clang::StandardConversionSequence::setAsIdentityConversion
void setAsIdentityConversion()
StandardConversionSequence - Set the standard conversion sequence to the identity conversion...
Definition: SemaOverload.cpp:188
clang::Sema::MarkCaptureUsedInEnclosingContext
void MarkCaptureUsedInEnclosingContext(VarDecl *Capture, SourceLocation Loc, unsigned CapturingScopeIndex)
Definition: SemaExpr.cpp:15784
clang::TargetInfo::getBuiltinVaListKind
virtual BuiltinVaListKind getBuiltinVaListKind() const =0
Returns the kind of __builtin_va_list type that should be used with this target.
clang::interp::APInt
llvm::APInt APInt
Definition: Integral.h:27
clang::CorrectionCandidateCallback::IsAddressOfOperand
bool IsAddressOfOperand
Definition: TypoCorrection.h:337
clang::Sema::ExpressionEvaluationContextRecord::NumTypos
unsigned NumTypos
The number of typos encountered during this expression evaluation context (i.e.
Definition: Sema.h:1086
clang::Sema::tryCaptureOpenMPLambdas
void tryCaptureOpenMPLambdas(ValueDecl *V)
Function tries to capture lambda&#39;s captured variables in the OpenMP region before the original lambda...
Definition: SemaOpenMP.cpp:3804
clang::ObjCPropertyDecl
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:741
clang::ImplicitCastExpr
ImplicitCastExpr - Allows us to explicitly represent implicit type conversions, which have no direct ...
Definition: Expr.h:3274
clang::QualType::isDestructedType
DestructionKind isDestructedType() const
Returns a nonzero value if objects of this type require non-trivial work to clean up after...
Definition: Type.h:1174
clang::Expr::findBoundMemberType
static QualType findBoundMemberType(const Expr *expr)
Given an expression of bound-member type, find the type of the member.
Definition: Expr.cpp:2800
clang::FunctionProtoTypeLoc
Definition: TypeLoc.h:1466
clang::Expr::isLValue
bool isLValue() const
isLValue - True if this expression is an "l-value" according to the rules of the current language...
Definition: Expr.h:258
clang::Expr::isModifiableLvalue
isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc=nullptr) const
isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, does not have an incomplet...
Definition: ExprClassification.cpp:679
clang::VectorType::AltiVecVector
is AltiVec vector
Definition: Type.h:3242
clang::ParmVarDecl::hasUninstantiatedDefaultArg
bool hasUninstantiatedDefaultArg() const
Definition: Decl.h:1713
SemaFixItUtils.h
clang::Sema::VerifyICEDiagnoser::diagnoseFold
virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR)
Definition: SemaExpr.cpp:15006
clang::Sema::DiagnoseUseOfDecl
bool DiagnoseUseOfDecl(NamedDecl *D, ArrayRef< SourceLocation > Locs, const ObjCInterfaceDecl *UnknownObjCClass=nullptr, bool ObjCPropertyAccess=false, bool AvoidPartialAvailabilityChecks=false, ObjCInterfaceDecl *ClassReciever=nullptr)
Determine whether the use of this declaration is valid, and emit any corresponding diagnostics...
Definition: SemaExpr.cpp:207
clang::Sema::ActOnOMPArraySectionExpr
ExprResult ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc, Expr *LowerBound, SourceLocation ColonLoc, Expr *Length, SourceLocation RBLoc)
Definition: SemaExpr.cpp:4584
clang::PointerType::isAddressSpaceOverlapping
bool isAddressSpaceOverlapping(const PointerType &other) const
Returns true if address spaces of pointers overlap.
Definition: Type.h:2637
clang::sema::LambdaScopeInfo::addPotentialThisCapture
void addPotentialThisCapture(SourceLocation Loc)
Definition: ScopeInfo.h:914
clang::Type::isFixedPointOrIntegerType
bool isFixedPointOrIntegerType() const
Return true if this is a fixed point or integer type.
Definition: Type.h:6832
clang::Type::getTypeClass
TypeClass getTypeClass() const
Definition: Type.h:1876
clang::UETT_AlignOf
Used for C&#39;s _Alignof and C++&#39;s alignof.
Definition: TypeTraits.h:100
clang::FunctionDecl::getMinRequiredArguments
unsigned getMinRequiredArguments() const
Returns the minimum number of arguments needed to call this function.
Definition: Decl.cpp:3263
clang::Decl::isUsed
bool isUsed(bool CheckUsedAttr=true) const
Whether any (re-)declaration of the entity was used, meaning that a definition is required...
Definition: DeclBase.cpp:398
clang::TSK_Undeclared
This template specialization was formed from a template-id but has not yet been declared, defined, or instantiated.
Definition: Specifiers.h:178
clang::ASTContext::typesAreBlockPointerCompatible
bool typesAreBlockPointerCompatible(QualType, QualType)
Definition: ASTContext.cpp:8761
clang::Type::isAnyCharacterType
bool isAnyCharacterType() const
Determine whether this type is any of the built-in character types.
Definition: Type.cpp:1907
clang::AtomicType
Definition: Type.h:6125
clang::CharacterLiteral
Definition: Expr.h:1530
clang::isTargetAddressSpace
bool isTargetAddressSpace(LangAS AS)
Definition: AddressSpaces.h:62
clang::EnumType::getDecl
EnumDecl * getDecl() const
Definition: Type.h:4528
clang::ObjCMessageExpr::getMethodDecl
const ObjCMethodDecl * getMethodDecl() const
Definition: ExprObjC.h:1356
ExprOpenMP.h
clang::Type::isVectorType
bool isVectorType() const
Definition: Type.h:6606
clang::ICK_Complex_Real
Complex-real conversions (C99 6.3.1.7)
Definition: Overload.h:167
clang::getComparisonCategoryForBuiltinCmp
Optional< ComparisonCategoryType > getComparisonCategoryForBuiltinCmp(QualType T)
Get the comparison category that should be used when comparing values of type T.
Definition: ComparisonCategories.cpp:23
clang::Qualifiers::OCL_Autoreleasing
Assigning into this object requires a lifetime extension.
Definition: Type.h:177
clang::StmtExpr
StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
Definition: Expr.h:3954
clang::PredefinedExpr::LFuncSig
Definition: Expr.h:1920
clang::OverloadCandidateSet
OverloadCandidateSet - A set of overload candidates, used in C++ overload resolution (C++ 13...
Definition: Overload.h:896
clang::TypeLoc::getFullDataSize
unsigned getFullDataSize() const
Returns the size of the type source info data block.
Definition: TypeLoc.h:163
clang::UnresolvedMemberExpr::getNamingClass
CXXRecordDecl * getNamingClass()
Retrieve the naming class of this lookup.
Definition: ExprCXX.cpp:1569
clang::Sema::HandleExprEvaluationContextForTypeof
ExprResult HandleExprEvaluationContextForTypeof(Expr *E)
Definition: SemaExpr.cpp:15357
clang::QualType::isCanonical
bool isCanonical() const
Definition: Type.h:6300
clang::TemplateArgumentListInfo::setLAngleLoc
void setLAngleLoc(SourceLocation Loc)
Definition: TemplateBase.h:573
clang::CXXScopeSpec::isInvalid
bool isInvalid() const
An error occurred during parsing of the scope specifier.
Definition: DeclSpec.h:194
clang::TemplateArgumentListInfo::addArgument
void addArgument(const TemplateArgumentLoc &Loc)
Definition: TemplateBase.h:594
clang::ASTContext::hasSameUnqualifiedType
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2345
checkVectorShift
static QualType checkVectorShift(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign)
Return the resulting type when a vector is shifted by a scalar or vector shift amount.
Definition: SemaExpr.cpp:10011
clang::CXXNewExpr::getOperatorDelete
FunctionDecl * getOperatorDelete() const
Definition: ExprCXX.h:2220
isEnabled
static unsigned isEnabled(DiagnosticsEngine &D, unsigned diag)
Definition: AnalysisBasedWarnings.cpp:1982
clang::Type::isInstantiationDependentType
bool isInstantiationDependentType() const
Determine whether this type is an instantiation-dependent type, meaning that the type involves a temp...
Definition: Type.h:2156
clang::MultiVersionKind::None
FixedPoint.h
Defines the fixed point number interface.
clang::Expr::getExprLoc
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:224
clang::ASTContext::getArrayDecayedType
QualType getArrayDecayedType(QualType T) const
Return the properly qualified result of decaying the specified array type to a pointer.
Definition: ASTContext.cpp:5796
clang::ASTContext::getFloatTypeSemantics
const llvm::fltSemantics & getFloatTypeSemantics(QualType T) const
Return the APFloat &#39;semantics&#39; for the specified scalar floating point type.
Definition: ASTContext.cpp:1700
DiagnoseBadShiftValues
static void DiagnoseBadShiftValues(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, BinaryOperatorKind Opc, QualType LHSType)
Definition: SemaExpr.cpp:9925
PerformCastFn
ExprResult PerformCastFn(Sema &S, Expr *operand, QualType toType)
Definition: SemaExpr.cpp:1172
convertHalfVecBinOp
static ExprResult convertHalfVecBinOp(Sema &S, ExprResult LHS, ExprResult RHS, BinaryOperatorKind Opc, QualType ResultTy, ExprValueKind VK, ExprObjectKind OK, bool IsCompAssign, SourceLocation OpLoc, FPOptions FPFeatures)
Definition: SemaExpr.cpp:12854
clang::Sema::checkUnknownAnyCast
ExprResult checkUnknownAnyCast(SourceRange TypeRange, QualType CastType, Expr *CastExpr, CastKind &CastKind, ExprValueKind &VK, CXXCastPath &Path)
Check a cast of an unknown-any type.
Definition: SemaExpr.cpp:17900
clang::CompoundAssignOperator
CompoundAssignOperator - For compound assignments (e.g.
Definition: Expr.h:3654
clang::DeclAccessPair
A POD class for pairing a NamedDecl* with an access specifier.
Definition: DeclAccessPair.h:29
clang::ImplicitParamDecl
Definition: Decl.h:1531
clang::Type::isRealType
bool isRealType() const
Definition: Type.cpp:2027
clang::Type::isPlaceholderType
bool isPlaceholderType() const
Test for a type which does not represent an actual type-system type but is instead used as a placehol...
Definition: Type.h:6751
clang::AvailabilitySpec::getVersion
VersionTuple getVersion() const
Definition: Availability.h:51
clang::Sema::maybeExtendBlockObject
void maybeExtendBlockObject(ExprResult &E)
Do an explicit extend of the given block pointer if we&#39;re in ARC.
Definition: SemaExpr.cpp:6364
clang::Sema::ReuseLambdaContextDecl_t
ReuseLambdaContextDecl_t
Definition: Sema.h:4465
clang::VarDecl::setTemplateSpecializationKind
void setTemplateSpecializationKind(TemplateSpecializationKind TSK, SourceLocation PointOfInstantiation=SourceLocation())
For a static data member that was instantiated from a static data member of a class template...
Definition: Decl.cpp:2633
clang::Preprocessor::isMacroDefined
bool isMacroDefined(StringRef Id)
Definition: Preprocessor.h:1020
clang::CXXBasePathElement
Represents an element in a path from a derived class to a base class.
Definition: CXXInheritance.h:44
clang::AddrLabelExpr
AddrLabelExpr - The GNU address of label extension, representing &&label.
Definition: Expr.h:3910
clang::Sema::diagnoseTypo
void diagnoseTypo(const TypoCorrection &Correction, const PartialDiagnostic &TypoDiag, bool ErrorRecovery=true)
Definition: SemaLookup.cpp:5296
clang::Sema::MarkMemberReferenced
void MarkMemberReferenced(MemberExpr *E)
Perform reference-marking and odr-use handling for a MemberExpr.
Definition: SemaExpr.cpp:17047
clang::FunctionParmPackExpr
Represents a reference to a function parameter pack or init-capture pack that has been substituted bu...
Definition: ExprCXX.h:4337
clang::ASTContext::CharTy
CanQualType CharTy
Definition: ASTContext.h:1018
clang::Expr::LV_ArrayTemporary
Definition: Expr.h:273
clang::TemplateArgument
Represents a template argument.
Definition: TemplateBase.h:50
ConstVariable
Definition: SemaExpr.cpp:11620
clang::Type::isPipeType
bool isPipeType() const
Definition: Type.h:6710
clang::Sema::DecomposeUnqualifiedId
void DecomposeUnqualifiedId(const UnqualifiedId &Id, TemplateArgumentListInfo &Buffer, DeclarationNameInfo &NameInfo, const TemplateArgumentListInfo *&TemplateArgs)
Decomposes the given name into a DeclarationNameInfo, its location, and possibly a list of template a...
Definition: SemaExpr.cpp:1976
isInvalid
static bool isInvalid(LocType Loc, bool *Invalid)
Definition: SourceManager.cpp:1199
clang::NOUR_Discarded
This name appears as a potential result of a discarded value expression.
Definition: Specifiers.h:170
NonConstCaptureKind
NonConstCaptureKind
Is the given expression (which must be &#39;const&#39;) a reference to a variable which was originally non-co...
Definition: SemaExpr.cpp:11572
ConstructTransparentUnion
static void ConstructTransparentUnion(Sema &S, ASTContext &C, ExprResult &EResult, QualType UnionType, FieldDecl *Field)
Constructs a transparent union from an expression that is used to initialize the transparent union...
Definition: SemaExpr.cpp:8595
clang::ParmVarDecl::Create
static ParmVarDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg)
Definition: Decl.cpp:2672
clang::Expr::isKnownToHaveBooleanValue
bool isKnownToHaveBooleanValue(bool Semantic=true) const
isKnownToHaveBooleanValue - Return true if this is an integer expression that is known to return 0 or...
Definition: Expr.cpp:130
clang
Dataflow Directional Tag Classes.
Definition: CFGReachabilityAnalysis.h:21
clang::ASTContext::getFloatingTypeOrder
int getFloatingTypeOrder(QualType LHS, QualType RHS) const
Compare the rank of the two specified floating point types, ignoring the domain of the type (i...
Definition: ASTContext.cpp:5899
clang::SourceLocation::isValid
bool isValid() const
Return true if this is a valid SourceLocation object.
Definition: SourceLocation.h:106
clang::StringLiteral::Wide
Definition: Expr.h:1733
clang::FunctionType::getExtInfo
ExtInfo getExtInfo() const
Definition: Type.h:3691
clang::StringLiteral::UTF32
Definition: Expr.h:1733
clang::Sema::BuildParmVarDeclForTypedef
ParmVarDecl * BuildParmVarDeclForTypedef(DeclContext *DC, SourceLocation Loc, QualType T)
Synthesizes a variable for a parameter arising from a typedef.
Definition: SemaDecl.cpp:13239
clang::LangOptions::FPE_Ignore
Assume that floating-point exceptions are masked.
Definition: LangOptions.h:214
isScopedEnumerationType
static bool isScopedEnumerationType(QualType T)
Definition: SemaExpr.cpp:9919
clang::ASTContext::mergeTypes
QualType mergeTypes(QualType, QualType, bool OfBlockPointer=false, bool Unqualified=false, bool BlockReturnType=false)
Definition: ASTContext.cpp:9006
clang::VarDecl::getMemberSpecializationInfo
MemberSpecializationInfo * getMemberSpecializationInfo() const
If this variable is an instantiation of a static data member of a class template specialization, retrieves the member specialization information.
Definition: Decl.cpp:2624
clang::UnaryOperatorKind
UnaryOperatorKind
Definition: OperationKinds.h:30
clang::ASTContext::hasDirectOwnershipQualifier
bool hasDirectOwnershipQualifier(QualType Ty) const
Return true if the type has been explicitly qualified with ObjC ownership.
Definition: ASTContext.cpp:8128
clang::DeclContext
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1271
clang::Sema::ActOnUnaryOp
ExprResult ActOnUnaryOp(Scope *S, SourceLocation OpLoc, tok::TokenKind Op, Expr *Input)
Definition: SemaExpr.cpp:13885
clang::Expr::EvalResult
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:586
clang::Sema::getCurObjCLexicalContext
const DeclContext * getCurObjCLexicalContext() const
Definition: Sema.h:11951
clang::CXXDeleteExpr
Represents a delete expression for memory deallocation and destructor calls, e.g. ...
Definition: ExprCXX.h:2359
TryImplicitConversion
static ImplicitConversionSequence TryImplicitConversion(Sema &S, Expr *From, QualType ToType, bool SuppressUserConversions, bool AllowExplicit, bool InOverloadResolution, bool CStyle, bool AllowObjCWritebackConversion, bool AllowObjCConversionOnExplicit)
TryImplicitConversion - Attempt to perform an implicit conversion from the given expression (Expr) to...
Definition: SemaOverload.cpp:1421
clang::BlockDecl::captures
ArrayRef< Capture > captures() const
Definition: Decl.h:4164
diagnoseStringPlusInt
static void diagnoseStringPlusInt(Sema &Self, SourceLocation OpLoc, Expr *LHSExpr, Expr *RHSExpr)
diagnoseStringPlusInt - Emit a warning when adding an integer to a string literal.
Definition: SemaExpr.cpp:9622
clang::ASTContext::isSentinelNullExpr
bool isSentinelNullExpr(const Expr *E)
Definition: ASTContext.cpp:2702
clang::TemplateDecl
The base class of all kinds of template declarations (e.g., class, function, etc.).
Definition: DeclTemplate.h:402
clang::OverloadedOperatorKind
OverloadedOperatorKind
Enumeration specifying the different kinds of C++ overloaded operators.
Definition: OperatorKinds.h:21
clang::CharacterLiteral::CharacterKind
CharacterKind
Definition: Expr.h:1532
clang::Sema::GetSignedVectorType
QualType GetSignedVectorType(QualType V)
Definition: SemaExpr.cpp:11198
clang::Sema::ImpCastExprToType
ExprResult ImpCastExprToType(Expr *E, QualType Type, CastKind CK, ExprValueKind VK=VK_RValue, const CXXCastPath *BasePath=nullptr, CheckedConversionKind CCK=CCK_ImplicitConversion)
ImpCastExprToType - If Expr is not of type &#39;Type&#39;, insert an implicit cast.
Definition: Sema.cpp:529
clang::TargetInfo::CharPtrBuiltinVaList
typedef char* __builtin_va_list;
Definition: TargetInfo.h:228
unsupportedTypeConversion
static bool unsupportedTypeConversion(const Sema &S, QualType LHSType, QualType RHSType)
Diagnose attempts to convert between __float128 and long double if there is no support for such conve...
Definition: SemaExpr.cpp:1134
clang::TypeLoc::getType
QualType getType() const
Get the type for which this source info wrapper provides information.
Definition: TypeLoc.h:132
clang::Sema::CheckVectorCompareOperands
QualType CheckVectorCompareOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, BinaryOperatorKind Opc)
CheckVectorCompareOperands - vector comparisons are a clang extension that operates on extended vecto...
Definition: SemaExpr.cpp:11238
clang::FunctionDecl::getTemplateSpecializationKind
TemplateSpecializationKind getTemplateSpecializationKind() const
Determine what kind of template instantiation this function represents.
Definition: Decl.cpp:3756
clang::DeclContext::isRecord
bool isRecord() const
Definition: DeclBase.h:1863
clang::BinaryOperator::isShiftOp
bool isShiftOp() const
Definition: Expr.h:3513
clang::Sema::ExpressionEvaluationContext::UnevaluatedAbstract
The current expression occurs within an unevaluated operand that unconditionally permits abstract ref...
clang::TemplateIdAnnotation::RAngleLoc
SourceLocation RAngleLoc
The location of the &#39;>&#39; after the template argument list.
Definition: ParsedTemplate.h:181
clang::Sema::CheckLiteralKind
ObjCLiteralKind CheckLiteralKind(Expr *FromE)
Definition: SemaExpr.cpp:10265
clang::QualType::isCXX98PODType
bool isCXX98PODType(const ASTContext &Context) const
Return true if this is a POD type according to the rules of the C++98 standard, regardless of the cur...
Definition: Type.cpp:2193
clang::C99
Definition: LangStandard.h:43
clang::IndirectFieldDecl
Represents a field injected from an anonymous union/struct into the parent scope. ...
Definition: Decl.h:2980
clang::Sema::ComparisonCategoryUsage::OperatorInExpression
The &#39;<=>&#39; operator was used in an expression and a builtin operator was selected. ...
clang::SC_Extern
Definition: Specifiers.h:238
tryVectorConvertAndSplat
static bool tryVectorConvertAndSplat(Sema &S, ExprResult *scalar, QualType scalarTy, QualType vectorEltTy, QualType vectorTy, unsigned &DiagID)
Try to convert a value of non-vector type to a vector type by converting the type to the element type...
Definition: SemaExpr.cpp:8901
clang::CastExpr::setSubExpr
void setSubExpr(Expr *E)
Definition: Expr.h:3204
clang::Sema::ActOnAsTypeExpr
ExprResult ActOnAsTypeExpr(Expr *E, ParsedType ParsedDestTy, SourceLocation BuiltinLoc, SourceLocation RParenLoc)
__builtin_astype(...)
Definition: SemaExpr.cpp:5874
clang::Sema::DiagRuntimeBehavior
bool DiagRuntimeBehavior(SourceLocation Loc, const Stmt *Statement, const PartialDiagnostic &PD)
Conditionally issue a diagnostic based on the current evaluation context.
Definition: SemaExpr.cpp:17269
type
checkArithmeticNull
static void checkArithmeticNull(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompare)
Definition: SemaExpr.cpp:9301
clang::ASTContext::UnsignedLongLongTy
CanQualType UnsignedLongLongTy
Definition: ASTContext.h:1027
clang::StringLiteral::UTF16
Definition: Expr.h:1733
clang::FixItHint::CreateRemoval
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:118
clang::Sema::CheckCompatibleReinterpretCast
void CheckCompatibleReinterpretCast(QualType SrcType, QualType DestType, bool IsDereference, SourceRange Range)
Definition: SemaCast.cpp:1807
diagnoseTautologicalComparison
static void diagnoseTautologicalComparison(Sema &S, SourceLocation Loc, Expr *LHS, Expr *RHS, BinaryOperatorKind Opc)
Diagnose some forms of syntactically-obvious tautological comparison.
Definition: SemaExpr.cpp:10413
clang::VarDecl::getInit
const Expr * getInit() const
Definition: Decl.h:1229
clang::ASTContext::hasCvrSimilarType
bool hasCvrSimilarType(QualType T1, QualType T2)
Determine if two types are similar, ignoring only CVR qualifiers.
Definition: ASTContext.cpp:5478
clang::ObjCIvarRefExpr::getEndLoc
SourceLocation getEndLoc() const LLVM_READONLY
Definition: ExprObjC.h:595
clang::ObjCAvailabilityCheckExpr
A runtime availability query.
Definition: ExprObjC.h:1699
clang::GenericSelectionExpr::Create
static GenericSelectionExpr * Create(const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr, ArrayRef< TypeSourceInfo *> AssocTypes, ArrayRef< Expr *> AssocExprs, SourceLocation DefaultLoc, SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack, unsigned ResultIndex)
Create a non-result-dependent generic selection expression.
Definition: Expr.cpp:4243
clang::ICK_Array_To_Pointer
Array-to-pointer conversion (C++ [conv.array])
Definition: Overload.h:113
clang::TSK_ExplicitInstantiationDeclaration
This template specialization was instantiated from a template due to an explicit instantiation declar...
Definition: Specifiers.h:189
ShouldLookupResultBeMultiVersionOverload
static bool ShouldLookupResultBeMultiVersionOverload(const LookupResult &R)
Definition: SemaExpr.cpp:3027
clang::sema::CapturingScopeInfo::CXXThisCaptureIndex
unsigned CXXThisCaptureIndex
CXXThisCaptureIndex - The (index+1) of the capture of &#39;this&#39;; zero if &#39;this&#39; is not captured...
Definition: ScopeInfo.h:648
clang::Sema::CheckUnaryExprOrTypeTraitOperand
bool CheckUnaryExprOrTypeTraitOperand(Expr *E, UnaryExprOrTypeTrait ExprKind)
Check the constraints on expression operands to unary type expression and type traits.
Definition: SemaExpr.cpp:3942
clang::Sema::BuildStmtExpr
ExprResult BuildStmtExpr(SourceLocation LPLoc, Stmt *SubStmt, SourceLocation RPLoc, unsigned TemplateDepth)
Definition: SemaExpr.cpp:13916
clang::DeclarationName
The name of a declaration.
Definition: DeclarationName.h:145
clang::Stmt::getStmtClass
StmtClass getStmtClass() const
Definition: Stmt.h:1124
clang::VectorType::getVectorKind
VectorKind getVectorKind() const
Definition: Type.h:3280
clang::CastExpr::getCastKindName
const char * getCastKindName() const
Definition: Expr.h:3200
clang::LookupResult::getFoundDecl
NamedDecl * getFoundDecl() const
Fetch the unique decl found by this lookup.
Definition: Lookup.h:517
clang::ParmVarDecl::getDefaultArg
Expr * getDefaultArg()
Definition: Decl.cpp:2710
clang::FunctionDecl::setInstantiationIsPending
void setInstantiationIsPending(bool IC)
State that the instantiation of this function is pending.
Definition: Decl.h:2228
clang::QualType::getAsString
static std::string getAsString(SplitQualType split, const PrintingPolicy &Policy)
Definition: Type.h:990
clang::NamedDecl::isCXXClassMember
bool isCXXClassMember() const
Determine whether this declaration is a C++ class member.
Definition: Decl.h:328
clang::CXXMethodDecl::getParent
const CXXRecordDecl * getParent() const
Return the parent of this method declaration, which is the class in which this method is defined...
Definition: DeclCXX.h:2046
clang::CXXDefaultArgExpr::getExpr
const Expr * getExpr() const
Definition: ExprCXX.h:1241
clang::Type::isBooleanType
bool isBooleanType() const
Definition: Type.h:6894
clang::Decl::getKind
Kind getKind() const
Definition: DeclBase.h:432
rebuildUnknownAnyFunction
static ExprResult rebuildUnknownAnyFunction(Sema &S, Expr *fn)
Given a function expression of unknown-any type, try to rebuild it to have a function type...
Definition: SemaExpr.cpp:17546
clang::OverloadExpr::FindResult::Expression
OverloadExpr * Expression
Definition: ExprCXX.h:2894
clang::ASTContext::getFunctionNoProtoType
QualType getFunctionNoProtoType(QualType ResultTy, const FunctionType::ExtInfo &Info) const
Return a K&R style C function type like &#39;int()&#39;.
Definition: ASTContext.cpp:3832
clang::Expr::NPCK_ZeroExpression
Expression is a Null pointer constant built from a zero integer expression that is not a simple...
Definition: Expr.h:719
clang::Sema::prepareVectorSplat
ExprResult prepareVectorSplat(QualType VectorTy, Expr *SplattedExpr)
Prepare SplattedExpr for a vector splat operation, adding implicit casts if necessary.
Definition: SemaExpr.cpp:6704
clang::UnresolvedSet
A set of unresolved declarations.
Definition: UnresolvedSet.h:148
clang::Sema::ExpressionEvaluationContextRecord::isConstantEvaluated
bool isConstantEvaluated() const
Definition: Sema.h:1134
clang::Sema::VerifyICEDiagnoser::diagnoseNotICE
virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR)=0
clang::Sema::IncompatibleBlockPointer
IncompatibleBlockPointer - The assignment is between two block pointers types that are not compatible...
Definition: Sema.h:10690
clang::interp::InitField
bool InitField(InterpState &S, CodePtr OpPC, uint32_t I)
Definition: Interp.h:465
clang::Expr::NPCK_CXX11_nullptr
Expression is a C++11 nullptr.
Definition: Expr.h:725
diagnoseLogicalNotOnLHSofCheck
static void diagnoseLogicalNotOnLHSofCheck(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, BinaryOperatorKind Opc)
Warns on !x < y, !x & y where !(x < y), !(x & y) was probably intended.
Definition: SemaExpr.cpp:10357
clang::FunctionType::getCallResultType
QualType getCallResultType(const ASTContext &Context) const
Determine the type of an expression that calls a function of this type.
Definition: Type.h:3703
EmitDiagnosticForLogicalAndInLogicalOr
static void EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc, BinaryOperator *Bop)
It accepts a &#39;&&&#39; expr that is inside a &#39;||&#39; one.
Definition: SemaExpr.cpp:13246
clang::Expr::isIntegerConstantExpr
bool isIntegerConstantExpr(llvm::APSInt &Result, const ASTContext &Ctx, SourceLocation *Loc=nullptr, bool isEvaluated=true) const
isIntegerConstantExpr - Return true if this expression is a valid integer constant expression...
Definition: ExprConstant.cpp:14502
clang::TemplateSpecializationKind
TemplateSpecializationKind
Describes the kind of template specialization that a particular template specialization declaration r...
Definition: Specifiers.h:175
clang::DeclarationName::CXXDestructorName
Definition: DeclarationName.h:207
clang::InitializationKind::CreateCStyleCast
static InitializationKind CreateCStyleCast(SourceLocation StartLoc, SourceRange TypeRange, bool InitList)
Create a direct initialization for a C-style cast.
Definition: Initialization.h:629
clang::StringLiteral::Ascii
Definition: Expr.h:1733
clang::Sema::FullExprArg::get
Expr * get() const
Definition: Sema.h:4100
clang::VarDecl::isInitCapture
bool isInitCapture() const
Whether this variable is the implicit variable for a lambda init-capture.
Definition: Decl.h:1421
clang::DeclarationName::CXXConversionFunctionName
Definition: DeclarationName.h:208
clang::sema::CapturedRegionScopeInfo::OpenMPLevel
unsigned short OpenMPLevel
Definition: ScopeInfo.h:759
clang::ExplicitCastExpr
ExplicitCastExpr - An explicit cast written in the source code.
Definition: Expr.h:3337
checkArithmeticOnObjCPointer
static bool checkArithmeticOnObjCPointer(Sema &S, SourceLocation opLoc, Expr *op)
Diagnose if arithmetic on the given ObjC pointer is illegal.
Definition: SemaExpr.cpp:4428
clang::Sema::ActOnPredefinedExpr
ExprResult ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind)
Definition: SemaExpr.cpp:3371
clang::DeclarationNameInfo
DeclarationNameInfo - A collector data type for bundling together a DeclarationName and the correspnd...
Definition: DeclarationName.h:690
clang::InitListExpr::setInitializedFieldInUnion
void setInitializedFieldInUnion(FieldDecl *FD)
Definition: Expr.h:4527
diagnoseXorMisusedAsPow
static void diagnoseXorMisusedAsPow(Sema &S, const ExprResult &XorLHS, const ExprResult &XorRHS, const SourceLocation Loc)
Definition: SemaExpr.cpp:11278
clang::Sema::ActOnConstantExpression
ExprResult ActOnConstantExpression(ExprResult Res)
Definition: SemaExpr.cpp:16782
clang::Token::getLength
unsigned getLength() const
Definition: Token.h:129
clang::TypoCorrection::getCorrectionAsIdentifierInfo
IdentifierInfo * getCorrectionAsIdentifierInfo() const
Definition: TypoCorrection.h:86
clang::TargetInfo::hasFeature
virtual bool hasFeature(StringRef Feature) const
Determine whether the given target has the given feature.
Definition: TargetInfo.h:1143
clang::ASTContext::areComparableObjCPointerTypes
bool areComparableObjCPointerTypes(QualType LHS, QualType RHS)
Definition: ASTContext.cpp:8727
clang::Sema::GatherArgumentsForCall
bool GatherArgumentsForCall(SourceLocation CallLoc, FunctionDecl *FDecl, const FunctionProtoType *Proto, unsigned FirstParam, ArrayRef< Expr *> Args, SmallVectorImpl< Expr *> &AllArgs, VariadicCallType CallType=VariadicDoesNotApply, bool AllowExplicit=false, bool IsListInitialization=false)
GatherArgumentsForCall - Collector argument expressions for various form of call prototypes.
Definition: SemaExpr.cpp:5262
clang::Sema::CreateGenericSelectionExpr
ExprResult CreateGenericSelectionExpr(SourceLocation KeyLoc, SourceLocation DefaultLoc, SourceLocation RParenLoc, Expr *ControllingExpr, ArrayRef< TypeSourceInfo *> Types, ArrayRef< Expr *> Exprs)
Definition: SemaExpr.cpp:1541
clang::CXXScopeSpec::isValid
bool isValid() const
A scope specifier is present, and it refers to a real scope.
Definition: DeclSpec.h:196
clang::Expr::IgnoreParenImpCasts
Expr * IgnoreParenImpCasts() LLVM_READONLY
Skip past any parentheses and implicit casts which might surround this expression until reaching a fi...
Definition: Expr.cpp:2995
clang::Qualifiers::addConst
void addConst()
Definition: Type.h:263
clang::SourceLocation::isMacroID
bool isMacroID() const
Definition: SourceLocation.h:99
clang::Sema::IgnoredValueConversions
ExprResult IgnoredValueConversions(Expr *E)
IgnoredValueConversions - Given that an expression&#39;s result is syntactically ignored, perform any conversions that are required.
Definition: SemaExprCXX.cpp:7574
clang::Sema::LookupOverloadedOperatorName
void LookupOverloadedOperatorName(OverloadedOperatorKind Op, Scope *S, QualType T1, QualType T2, UnresolvedSetImpl &Functions)
Definition: SemaLookup.cpp:3067
clang::Sema::VerifyICEDiagnoser::Suppress
bool Suppress
Definition: Sema.h:11124
clang::ObjCObjectPointerType
Represents a pointer to an Objective C object.
Definition: Type.h:5951
handleFixedPointConversion
static QualType handleFixedPointConversion(Sema &S, QualType LHSTy, QualType RHSTy)
handleFixedPointConversion - Fixed point operations between fixed point types and integers or other f...
Definition: SemaExpr.cpp:1333
clang::TypeLoc::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
Get the full source range.
Definition: TypeLoc.h:152
clang::BlockPointerType
Pointer to a block type.
Definition: Type.h:2716
clang::ASTContext::ObjCBuiltinBoolTy
CanQualType ObjCBuiltinBoolTy
Definition: ASTContext.h:1049
OpenVariant::Open
The standard open() call: int open(const char *path, int oflag, ...);.
clang::Sema::LookupInstanceMethodInGlobalPool
ObjCMethodDecl * LookupInstanceMethodInGlobalPool(Selector Sel, SourceRange R, bool receiverIdOrClass=false)
LookupInstanceMethodInGlobalPool - Returns the method and warns if there are multiple signatures...
Definition: Sema.h:4063
EvaluatesAsFalse
static bool EvaluatesAsFalse(Sema &S, Expr *E)
Returns true if the given expression can be evaluated as a constant &#39;false&#39;.
Definition: SemaExpr.cpp:13267
clang::CXXDeleteExpr::getBeginLoc
SourceLocation getBeginLoc() const
Definition: ExprCXX.h:2410
clang::ASTContext::getIntWidth
unsigned getIntWidth(QualType T) const
Definition: ASTContext.cpp:9461
DiagnoseBadDivideOrRemainderValues
static void DiagnoseBadDivideOrRemainderValues(Sema &S, ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsDiv)
Definition: SemaExpr.cpp:9385
clang::Expr::IgnoreImplicit
Expr * IgnoreImplicit() LLVM_READONLY
Skip past any implicit AST nodes which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2983
clang::Sema::NTCUC_LValueToRValueVolatile
Definition: Sema.h:2312
clang::Type::isUnscopedEnumerationType
bool isUnscopedEnumerationType() const
Definition: Type.cpp:1864
clang::OO_None
Not an overloaded operator.
Definition: OperatorKinds.h:22
clang::Sema::ActOnUnaryExprOrTypeTraitExpr
ExprResult ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc, UnaryExprOrTypeTrait ExprKind, bool IsType, void *TyOrEx, SourceRange ArgRange)
ActOnUnaryExprOrTypeTraitExpr - Handle sizeof(type) and sizeof expr and the same for alignof and __al...
Definition: SemaExpr.cpp:4354
clang::Expr::EvalStatus::HasSideEffects
bool HasSideEffects
Whether the evaluated expression has side effects.
Definition: Expr.h:559
clang::RecordType
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4495
clang::ComplexType
Complex values, per C99 6.2.5p11.
Definition: Type.h:2554
clang::TemplateArgumentLoc
Location wrapper for a TemplateArgument.
Definition: TemplateBase.h:449
clang::CharacterLiteral::Wide
Definition: Expr.h:1534
clang::ParmVarDecl::getUninstantiatedDefaultArg
Expr * getUninstantiatedDefaultArg()
Definition: Decl.cpp:2752
clang::ASTContext::getStringLiteralArrayType
QualType getStringLiteralArrayType(QualType EltTy, unsigned Length) const
Return a type for a constant array for a string literal of the specified element type and length...
Definition: ASTContext.cpp:10490
clang::ASTContext::UnknownAnyTy
CanQualType UnknownAnyTy
Definition: ASTContext.h:1045
clang::FunctionDecl::setTemplateSpecializationKind
void setTemplateSpecializationKind(TemplateSpecializationKind TSK, SourceLocation PointOfInstantiation=SourceLocation())
Determine what kind of template instantiation this function represents.
Definition: Decl.cpp:3806
clang::CompoundStmt::body_empty
bool body_empty() const
Definition: Stmt.h:1374
clang::ObjCObjectPointerType::getInterfaceDecl
ObjCInterfaceDecl * getInterfaceDecl() const
If this pointer points to an Objective @interface type, gets the declaration for that interface...
Definition: Type.h:6007
clang::ArraySubscriptExpr
ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting.
Definition: Expr.h:2462
clang::CXXMethodDecl::getDevirtualizedMethod
CXXMethodDecl * getDevirtualizedMethod(const Expr *Base, bool IsAppleKext)
If it&#39;s possible to devirtualize a call to this method, return the called function.
Definition: DeclCXX.cpp:2094
clang::Sema::ObjCLiteralKind
ObjCLiteralKind
Definition: Sema.h:3133
OpenCLCheckVectorConditional
static QualType OpenCLCheckVectorConditional(Sema &S, ExprResult &Cond, ExprResult &LHS, ExprResult &RHS, SourceLocation QuestionLoc)
Return the resulting type for the conditional operator in OpenCL (aka "ternary selection operator"...
Definition: SemaExpr.cpp:7404
clang::Type::isIntegerType
bool isIntegerType() const
isIntegerType() does not include complex integers (a GCC extension).
Definition: Type.h:6811
clang::Sema::BuildQualifiedDeclarationNameExpr
ExprResult BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, bool IsAddressOfOperand, const Scope *S, TypeSourceInfo **RecoveryTSI=nullptr)
BuildQualifiedDeclarationNameExpr - Build a C++ qualified declaration name, generally during template...
Definition: SemaExpr.cpp:2525
clang::ASTContext::UnsignedLongTy
CanQualType UnsignedLongTy
Definition: ASTContext.h:1026
clang::DeclaratorDecl::setQualifierInfo
void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc)
Definition: Decl.cpp:1829
clang::ASTContext::areCompatibleVectorTypes
bool areCompatibleVectorTypes(QualType FirstVec, QualType SecondVec)
Return true if the given vector types are of the same unqualified type or if they are equivalent to t...
Definition: ASTContext.cpp:8105
clang::Decl::getAttr
T * getAttr() const
Definition: DeclBase.h:538
clang::Sema::CheckExtVectorCast
ExprResult CheckExtVectorCast(SourceRange R, QualType DestTy, Expr *CastExpr, CastKind &Kind)
Definition: SemaExpr.cpp:6737
clang::ObjCIvarRefExpr::getLocation
SourceLocation getLocation() const
Definition: ExprObjC.h:589
DiagnoseAdditionInShift
static void DiagnoseAdditionInShift(Sema &S, SourceLocation OpLoc, Expr *SubExpr, StringRef Shift)
Definition: SemaExpr.cpp:13328
clang::ConstantArrayType::getSize
const llvm::APInt & getSize() const
Definition: Type.h:2958
clang::ASTContext::getCharWidth
uint64_t getCharWidth() const
Return the size of the character type, in bits.
Definition: ASTContext.h:2108
clang::QualType::DK_none
Definition: Type.h:1163
clang::ASTContext::DependentTy
CanQualType DependentTy
Definition: ASTContext.h:1045
clang::Type::isImageType
bool isImageType() const
Definition: Type.h:6703
clang::Sema::getCurFunctionDecl
FunctionDecl * getCurFunctionDecl()
getCurFunctionDecl - If inside of a function body, this returns a pointer to the function decl for th...
Definition: Sema.cpp:1304
checkArithmeticBinOpPointerOperands
static bool checkArithmeticBinOpPointerOperands(Sema &S, SourceLocation Loc, Expr *LHSExpr, Expr *RHSExpr)
Check the validity of a binary arithmetic operation w.r.t.
Definition: SemaExpr.cpp:9567
clang::Type::isAtomicType
bool isAtomicType() const
Definition: Type.h:6631
clang::DeclRefExpr::Create
static DeclRefExpr * Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc, ValueDecl *D, bool RefersToEnclosingVariableOrCapture, SourceLocation NameLoc, QualType T, ExprValueKind VK, NamedDecl *FoundD=nullptr, const TemplateArgumentListInfo *TemplateArgs=nullptr, NonOdrUseReason NOUR=NOUR_None)
Definition: Expr.cpp:545
checkThreeWayNarrowingConversion
static bool checkThreeWayNarrowingConversion(Sema &S, QualType ToType, Expr *E, QualType FromType, SourceLocation Loc)
Definition: SemaExpr.cpp:10577
clang::Type::isFunctionType
bool isFunctionType() const
Definition: Type.h:6500
clang::Type::isObjCQualifiedIdType
bool isObjCQualifiedIdType() const
Definition: Type.h:6639
getUDSuffixLoc
static SourceLocation getUDSuffixLoc(Sema &S, SourceLocation TokLoc, unsigned Offset)
getUDSuffixLoc - Create a SourceLocation for a ud-suffix, given the location of the token and the off...
Definition: SemaExpr.cpp:1687
clang::DeclaratorDecl::getTypeSourceInfo
TypeSourceInfo * getTypeSourceInfo() const
Definition: Decl.h:700
clang::ExtVectorType
ExtVectorType - Extended vector type.
Definition: Type.h:3354
clang::UnaryOperator::getOpcode
Opcode getOpcode() const
Definition: Expr.h:2071
clang::ReferenceType
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:2750
clang::DeclContext::getRedeclContext
DeclContext * getRedeclContext()
getRedeclContext - Retrieve the context in which an entity conflicts with other entities of the same ...
Definition: DeclBase.cpp:1747
clang::ASTContext::hasSameType
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2321
clang::ASTContext::BoundMemberTy
CanQualType BoundMemberTy
Definition: ASTContext.h:1045
clang::Expr::LValueClassification
LValueClassification
Definition: Expr.h:263
clang::Sema::ExprEvalContexts
SmallVector< ExpressionEvaluationContextRecord, 8 > ExprEvalContexts
A stack of expression evaluation contexts.
Definition: Sema.h:1140
checkBlockPointerTypesForAssignment
static Sema::AssignConvertType checkBlockPointerTypesForAssignment(Sema &S, QualType LHSType, QualType RHSType)
checkBlockPointerTypesForAssignment - This routine determines whether two block pointer types are com...
Definition: SemaExpr.cpp:8159
clang::Sema::isInOpenMPDeclareTargetContext
bool isInOpenMPDeclareTargetContext() const
Return true inside OpenMP declare target region.
Definition: Sema.h:9866
clang::Sema::CreateBuiltinUnaryOp
ExprResult CreateBuiltinUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc, Expr *InputExpr)
Definition: SemaExpr.cpp:13576
CheckIncrementDecrementOperand
static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op, ExprValueKind &VK, ExprObjectKind &OK, SourceLocation OpLoc, bool IsInc, bool IsPrefix)
CheckIncrementDecrementOperand - unlike most "Check" methods, this routine doesn&#39;t need to call Usual...
Definition: SemaExpr.cpp:12232
clang::ASTContext::getConstantArrayType
QualType getConstantArrayType(QualType EltTy, const llvm::APInt &ArySize, const Expr *SizeExpr, ArrayType::ArraySizeModifier ASM, unsigned IndexTypeQuals) const
Return the unique reference to the type for a constant array of the specified element type...
Definition: ASTContext.cpp:3321
clang::ObjCObjectPointerType::quals
qual_range quals() const
Definition: Type.h:6074
clang::InternalLinkage
Internal linkage, which indicates that the entity can be referred to from within the translation unit...
Definition: Linkage.h:31
CheckDeclInExpr
static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D)
Diagnoses obvious problems with the use of the given declaration as an expression.
Definition: SemaExpr.cpp:3003
clang::FixItHint::CreateInsertion
static FixItHint CreateInsertion(SourceLocation InsertionLoc, StringRef Code, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code string at a specific location.
Definition: Diagnostic.h:92
clang::ASTContext::canAssignObjCInterfaces
bool canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, const ObjCObjectPointerType *RHSOPT)
canAssignObjCInterfaces - Return true if the two interface types are compatible for assignment from R...
Definition: ASTContext.cpp:8303
clang::Sema::ExpressionEvaluationContextRecord::isUnevaluated
bool isUnevaluated() const
Definition: Sema.h:1129
PartialDiagnostic.h
Implements a partial diagnostic that can be emitted anwyhere in a DiagnosticBuilder stream...
clang::LookupResult::getLookupKind
Sema::LookupNameKind getLookupKind() const
Gets the kind of lookup to perform.
Definition: Lookup.h:253
clang::ObjCIvarRefExpr::getBase
const Expr * getBase() const
Definition: ExprObjC.h:580
clang::Type::getNullability
Optional< NullabilityKind > getNullability(const ASTContext &context) const
Determine the nullability of the given type.
Definition: Type.cpp:3828
clang::FunctionDecl::getTemplateSpecializationKindForInstantiation
TemplateSpecializationKind getTemplateSpecializationKindForInstantiation() const
Determine the kind of template specialization this function represents for the purpose of template in...
Definition: Decl.cpp:3772
clang::QualType::getNonLValueExprType
QualType getNonLValueExprType(const ASTContext &Context) const
Determine the type of a (typically non-lvalue) expression with the specified result type...
Definition: Type.cpp:2915
clang::Type::isConstantArrayType
bool isConstantArrayType() const
Definition: Type.h:6574
clang::QualType::hasAddressSpace
bool hasAddressSpace() const
Check if this type has any address space qualifier.
Definition: Type.h:6372
clang::sema::CapturingScopeInfo::CaptureMap
llvm::DenseMap< VarDecl *, unsigned > CaptureMap
CaptureMap - A map of captured variables to (index+1) into Captures.
Definition: ScopeInfo.h:644
clang::APValue
APValue - This class implements a discriminated union of [uninitialized] [APSInt] [APFloat]...
Definition: APValue.h:115
NCCK_Lambda
Definition: SemaExpr.cpp:11572
clang::Sema::ActOnBuiltinOffsetOf
ExprResult ActOnBuiltinOffsetOf(Scope *S, SourceLocation BuiltinLoc, SourceLocation TypeLoc, ParsedType ParsedArgTy, ArrayRef< OffsetOfComponent > Components, SourceLocation RParenLoc)
Definition: SemaExpr.cpp:14149
clang::OK_BitField
A bitfield object is a bitfield on a C or C++ record.
Definition: Specifiers.h:144
tryGCCVectorConvertAndSplat
static bool tryGCCVectorConvertAndSplat(Sema &S, ExprResult *Scalar, ExprResult *Vector)
Attempt to convert and splat Scalar into a vector whose types matches Vector following GCC conversion...
Definition: SemaExpr.cpp:9049
clang::Sema::CheckComparisonCategoryType
QualType CheckComparisonCategoryType(ComparisonCategoryType Kind, SourceLocation Loc, ComparisonCategoryUsage Usage)
Lookup the specified comparison category types in the standard library, an check the VarDecls possibl...
Definition: SemaDeclCXX.cpp:10727
clang::Decl::markUsed
void markUsed(ASTContext &C)
Mark the declaration used, in the sense of odr-use.
Definition: DeclBase.cpp:413
clang::ASTContext::getTypeSize
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2104
clang::ObjCIvarRefExpr
ObjCIvarRefExpr - A reference to an ObjC instance variable.
Definition: ExprObjC.h:546
clang::Scope::DeclScope
This is a scope that can contain a declaration.
Definition: Scope.h:59
clang::InitializedEntity::InitializeStmtExprResult
static InitializedEntity InitializeStmtExprResult(SourceLocation ReturnLoc, QualType Type)
Definition: Initialization.h:290
diagnoseDistinctPointerComparison
static void diagnoseDistinctPointerComparison(Sema &S, SourceLocation Loc, ExprResult &LHS, ExprResult &RHS, bool IsError)
Diagnose bad pointer comparisons.
Definition: SemaExpr.cpp:10156
clang::Sema::InvalidOperands
QualType InvalidOperands(SourceLocation Loc, ExprResult &LHS, ExprResult &RHS)
the following "Check" methods will return a valid/converted QualType or a null QualType (indicating a...
Definition: SemaExpr.cpp:8838
clang::Type::isObjCObjectType
bool isObjCObjectType() const
Definition: Type.h:6622
clang::Type::isIncompleteType
bool isIncompleteType(NamedDecl **Def=nullptr) const
Types are partitioned into 3 broad categories (C99 6.2.5p1): object types, function types...
Definition: Type.cpp:2115
clang::ASTContext::Char8Ty
CanQualType Char8Ty
Definition: ASTContext.h:1022
clang::FunctionDecl::isInlined
bool isInlined() const
Determine whether this function should be inlined, because it is either marked "inline" or "constexpr...
Definition: Decl.h:2513
clang::Sema::checkAddressOfFunctionIsAvailable
bool checkAddressOfFunctionIsAvailable(const FunctionDecl *Function, bool Complain=false, SourceLocation Loc=SourceLocation())
Returns whether the given function&#39;s address can be taken or not, optionally emitting a diagnostic if...
Definition: SemaOverload.cpp:10010
clang::QualType::withCVRQualifiers
QualType withCVRQualifiers(unsigned CVR) const
Definition: Type.h:846
clang::PredefinedExpr::Func
Definition: Expr.h:1915
clang::Sema::getScopeForContext
Scope * getScopeForContext(DeclContext *Ctx)
Determines the active Scope associated with the given declaration context.
Definition: Sema.cpp:1652
clang::ASTContext::getCanonicalType
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2305
clang::Sema::IsDependentFunctionNameExpr
bool IsDependentFunctionNameExpr(Expr *E)
Check whether the given type-dependent expression will be the name of a function or another callable ...
Definition: SemaExpr.cpp:18156
clang::CXXScopeSpec::isSet
bool isSet() const
Deprecated.
Definition: DeclSpec.h:209
clang::TypeSourceInfo::getTypeLoc
TypeLoc getTypeLoc() const
Return the TypeLoc wrapper for the type source info.
Definition: TypeLoc.h:244
clang::Sema::CheckUnusedVolatileAssignment
void CheckUnusedVolatileAssignment(Expr *E)
Check whether E, which is either a discarded-value expression or an unevaluated operand, is a simple-assignment to a volatlie-qualified lvalue, and if so, remove it from the list of volatile-qualified assignments that we are going to warn are deprecated.
Definition: SemaExpr.cpp:15268
clang::UnaryOperator::isArithmeticOp
bool isArithmeticOp() const
Definition: Expr.h:2127
clang::LookupResult::getNamingClass
CXXRecordDecl * getNamingClass() const
Returns the &#39;naming class&#39; for this lookup, i.e.
Definition: Lookup.h:403
clang::BlockDecl::Create
static BlockDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation L)
Definition: Decl.cpp:4724
clang::Qualifiers::OCL_Weak
Reading or writing from this object requires a barrier call.
Definition: Type.h:174
clang::Type::isQueueT
bool isQueueT() const
Definition: Type.h:6695
clang::Sema::CreateUnaryExprOrTypeTraitExpr
ExprResult CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo, SourceLocation OpLoc, UnaryExprOrTypeTrait ExprKind, SourceRange R)
Build a sizeof or alignof expression given a type operand.
Definition: SemaExpr.cpp:4265
clang::TemplateArgument::getKind
ArgKind getKind() const
Return the kind of stored template argument.
Definition: TemplateBase.h:234
clang::DeclarationNameTable::getCXXLiteralOperatorName
DeclarationName getCXXLiteralOperatorName(IdentifierInfo *II)
Get the name of the literal operator function with II as the identifier.
Definition: DeclarationName.cpp:362
clang::FunctionProtoType::getParamType
QualType getParamType(unsigned i) const
Definition: Type.h:3966
clang::Sema::DefaultVariadicArgumentPromotion
ExprResult DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT, FunctionDecl *FDecl)
DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but will create a trap if the resul...
Definition: SemaExpr.cpp:923
clang::Expr::EvaluateAsInt
bool EvaluateAsInt(EvalResult &Result, const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects, bool InConstantContext=false) const
EvaluateAsInt - Return true if this is a constant which we can fold and convert to an integer...
Definition: ExprConstant.cpp:13770
clang::Expr::NPCK_ZeroLiteral
Expression is a Null pointer constant built from a literal zero.
Definition: Expr.h:722
clang::ASTContext::typesAreCompatible
bool typesAreCompatible(QualType T1, QualType T2, bool CompareUnqualified=false)
Compatibility predicates used to check assignment expressions.
Definition: ASTContext.cpp:8749
DoMarkVarDeclReferenced
static void DoMarkVarDeclReferenced(Sema &SemaRef, SourceLocation Loc, VarDecl *Var, Expr *E)
Definition: SemaExpr.cpp:16820
clang::ICK_Function_To_Pointer
Function-to-pointer (C++ [conv.array])
Definition: Overload.h:116
clang::ASTContext::getTranslationUnitDecl
TranslationUnitDecl * getTranslationUnitDecl() const
Definition: ASTContext.h:1009
clang::Sema::ActOnGenericSelectionExpr
ExprResult ActOnGenericSelectionExpr(SourceLocation KeyLoc, SourceLocation DefaultLoc, SourceLocation RParenLoc, Expr *ControllingExpr, ArrayRef< ParsedType > ArgTypes, ArrayRef< Expr *> ArgExprs)
Definition: SemaExpr.cpp:1515
clang::MemberExpr
MemberExpr - [C99 6.5.2.3] Structure and Union Members.
Definition: Expr.h:2836
clang::Expr::MLV_ConstQualified
Definition: Expr.h:286
clang::UETT_SizeOf
Definition: TypeTraits.h:97
clang::Sema::ExpressionEvaluationContextRecord
Data structure used to record current or nested expression evaluation contexts.
Definition: Sema.h:1070
clang::Sema::CheckBitwiseOperands
QualType CheckBitwiseOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, BinaryOperatorKind Opc)
Definition: SemaExpr.cpp:11414
clang::sema::CapturingScopeInfo::addCapture
void addCapture(VarDecl *Var, bool isBlock, bool isByref, bool isNested, SourceLocation Loc, SourceLocation EllipsisLoc, QualType CaptureType, bool Invalid)
Definition: ScopeInfo.h:661
clang::InitializationSequence
Describes the sequence of initializations required to initialize a given object or reference with a s...
Definition: Initialization.h:760
clang::StringLiteral::UTF8
Definition: Expr.h:1733
clang::ExprResult
ActionResult< Expr * > ExprResult
Definition: Ownership.h:263
clang::QualType::getUnqualifiedType
QualType getUnqualifiedType() const
Retrieve the unqualified variant of the given type, removing as little sugar as possible.
Definition: Type.h:6336
clang::sema::PossiblyUnreachableDiag
Definition: ScopeInfo.h:85
handleFloatConversion
static QualType handleFloatConversion(Sema &S, ExprResult &LHS, ExprResult &RHS, QualType LHSType, QualType RHSType, bool IsCompAssign)
Handle arithmethic conversion with floating point types.
Definition: SemaExpr.cpp:1095
clang::ParmVarDecl::setDefaultArg
void setDefaultArg(Expr *defarg)
Definition: Decl.cpp:2722
isObjCObjectLiteral
static bool isObjCObjectLiteral(ExprResult &E)
Definition: SemaExpr.cpp:10206
clang::Type::hasSignedIntegerRepresentation
bool hasSignedIntegerRepresentation() const
Determine whether this type has an signed integer representation of some sort, e.g., it is an signed integer type or a vector.
Definition: Type.cpp:1958
clang::CXXRecordDecl
Represents a C++ struct/union/class.
Definition: DeclCXX.h:253
clang::Sema::Compatible
Compatible - the types are compatible according to the standard.
Definition: Sema.h:10635
clang::ASTContext::getRValueReferenceType
QualType getRValueReferenceType(QualType T) const
Return the uniqued reference to the type for an rvalue reference to the specified type...
Definition: ASTContext.cpp:3257
clang::Type::isVoidType
bool isVoidType() const
Definition: Type.h:6777
clang::ASTContext::getTypeInfo
TypeInfo getTypeInfo(const Type *T) const
Get the size and alignment of the specified complete type in bits.
Definition: ASTContext.cpp:1903
clang::Sema::CUDAFunctionTarget
CUDAFunctionTarget
Definition: Sema.h:11347
clang::sema::Capture::markUsed
void markUsed(bool IsODRUse)
Definition: ScopeInfo.h:598
clang::Sema::getCurFunction
sema::FunctionScopeInfo * getCurFunction() const
Definition: Sema.h:1521
clang::OMPArraySectionExpr::getBaseOriginalType
static QualType getBaseOriginalType(const Expr *Base)
Return original type of the base expression for array section.
Definition: Expr.cpp:4712
clang::ParenExpr::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:2014
clang::ChooseExpr
ChooseExpr - GNU builtin-in function __builtin_choose_expr.
Definition: Expr.h:4136
clang::Expr::hasAnyTypeDependentArguments
static bool hasAnyTypeDependentArguments(ArrayRef< Expr *> Exprs)
hasAnyTypeDependentArguments - Determines if any of the expressions in Exprs is type-dependent.
Definition: Expr.cpp:3181
clang::sema::Capture::isNested
bool isNested() const
Definition: ScopeInfo.h:589
clang::Sema::LK_None
Definition: Sema.h:3140
IsArithmeticBinaryExpr
static bool IsArithmeticBinaryExpr(Expr *E, BinaryOperatorKind *Opcode, Expr **RHSExprs)
IsArithmeticBinaryExpr - Returns true if E is an arithmetic binary expression, either using a built-i...
Definition: SemaExpr.cpp:7759
clang::BinaryConditionalOperator
BinaryConditionalOperator - The GNU extension to the conditional operator which allows the middle ope...
Definition: Expr.h:3808
clang::Type::hasIntegerRepresentation
bool hasIntegerRepresentation() const
Determine whether this type has an integer representation of some sort, e.g., it is an integer type o...
Definition: Type.cpp:1818
clang::ParenListExpr::getRParenLoc
SourceLocation getRParenLoc() const
Definition: Expr.h:5195
clang::QualType::getQualifiers
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6283
clang::SourceLocation::isInvalid
bool isInvalid() const
Definition: SourceLocation.h:107
clang::Sema::LookupLiteralOperator
LiteralOperatorLookupResult LookupLiteralOperator(Scope *S, LookupResult &R, ArrayRef< QualType > ArgTys, bool AllowRaw, bool AllowTemplate, bool AllowStringTemplate, bool DiagnoseMissing)
LookupLiteralOperator - Determine which literal operator should be used for a user-defined literal...
Definition: SemaLookup.cpp:3405
clang::ObjCIvarDecl
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1959
clang::UETT_VecStep
Definition: TypeTraits.h:101
clang::ASTContext::Char16Ty
CanQualType Char16Ty
Definition: ASTContext.h:1023
clang::BinaryOperator::isMultiplicativeOp
bool isMultiplicativeOp() const
Definition: Expr.h:3509
clang::ASTContext::removeAddrSpaceQualType
QualType removeAddrSpaceQualType(QualType T) const
Remove any existing address space on the type and returns the type with qualifiers intact (or that&#39;s ...
Definition: ASTContext.cpp:2884
clang::Sema::isLaxVectorConversion
bool isLaxVectorConversion(QualType srcType, QualType destType)
Is this a legal conversion between two types, one of which is known to be a vector type...
Definition: SemaExpr.cpp:6656
clang::sema::LambdaScopeInfo
Definition: ScopeInfo.h:793
clang::Sema::TryCaptureKind
TryCaptureKind
Definition: Sema.h:4507
clang::Sema::NeedToCaptureVariable
bool NeedToCaptureVariable(VarDecl *Var, SourceLocation Loc)
Checks if the variable must be captured.
Definition: SemaExpr.cpp:16389
clang::Sema::PoppedFunctionScopePtr
std::unique_ptr< sema::FunctionScopeInfo, PoppedFunctionScopeDeleter > PoppedFunctionScopePtr
Definition: Sema.h:1514
clang::Sema::CheckCompareOperands
QualType CheckCompareOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, BinaryOperatorKind Opc)
Definition: SemaExpr.cpp:10756
clang::Sema::CheckMultiplyDivideOperands
QualType CheckMultiplyDivideOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign, bool IsDivide)
Definition: SemaExpr.cpp:9398
clang::sema::BlockScopeInfo::TheDecl
BlockDecl * TheDecl
Definition: ScopeInfo.h:718
clang::Sema::AddOverloadCandidate
void AddOverloadCandidate(FunctionDecl *Function, DeclAccessPair FoundDecl, ArrayRef< Expr *> Args, OverloadCandidateSet &CandidateSet, bool SuppressUserConversions=false, bool PartialOverloading=false, bool AllowExplicit=true, bool AllowExplicitConversion=false, ADLCallKind IsADLCandidate=ADLCallKind::NotADL, ConversionSequenceList EarlyConversions=None, OverloadCandidateParamOrder PO={})
AddOverloadCandidate - Adds the given function to the set of candidate functions, using the given fun...
Definition: SemaOverload.cpp:6128
clang::ASTContext::BuiltinInfo
Builtin::Context & BuiltinInfo
Definition: ASTContext.h:582
clang::TemplateArgumentLocInfo
Location information for a TemplateArgument.
Definition: TemplateBase.h:392
clang::Sema::CurContext
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:397
clang::Type::isSamplerT
bool isSamplerT() const
Definition: Type.h:6683
clang::sema::CapturingScopeInfo::isCXXThisCaptured
bool isCXXThisCaptured() const
Determine whether the C++ &#39;this&#39; is captured.
Definition: ScopeInfo.h:679
clang::Sema::MaybeSuggestAddingStaticToDecl
void MaybeSuggestAddingStaticToDecl(const FunctionDecl *D)
Definition: SemaExpr.cpp:184
clang::Expr::containsUnexpandedParameterPack
bool containsUnexpandedParameterPack() const
Whether this expression contains an unexpanded parameter pack (for C++11 variadic templates)...
Definition: Expr.h:223
clang::Expr::isRValue
bool isRValue() const
Definition: Expr.h:259
clang::Qualifiers::isAddressSpaceSupersetOf
static bool isAddressSpaceSupersetOf(LangAS A, LangAS B)
Returns true if address space A is equal to or a superset of B.
Definition: Type.h:476
clang::DeclContext::getLookupParent
DeclContext * getLookupParent()
Find the parent context of this context that will be used for unqualified name lookup.
Definition: DeclBase.cpp:1042
clang::StringLiteralParser
StringLiteralParser - This decodes string escape characters and performs wide string analysis and Tra...
Definition: LiteralSupport.h:205
Expr.h
clang::ASTContext::getPointerType
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
Definition: ASTContext.cpp:3098
clang::FixItHint::CreateReplacement
static FixItHint CreateReplacement(CharSourceRange RemoveRange, StringRef Code)
Create a code modification hint that replaces the given source range with the given code string...
Definition: Diagnostic.h:129
clang::BuiltinType
This class is used for builtin types like &#39;int&#39;.
Definition: Type.h:2465
clang::Sema::DiagnoseEmptyLookup
bool DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R, CorrectionCandidateCallback &CCC, TemplateArgumentListInfo *ExplicitTemplateArgs=nullptr, ArrayRef< Expr *> Args=None, TypoExpr **Out=nullptr)
Diagnose an empty lookup.
Definition: SemaExpr.cpp:2034
clang::Sema::getSourceManager
SourceManager & getSourceManager() const
Definition: Sema.h:1357
clang::LookupResult::end
iterator end() const
Definition: Lookup.h:336
clang::UnqualifiedIdKind::IK_TemplateId
A template-id, e.g., f<int>.
clang::CXXDefaultArgExpr::Create
static CXXDefaultArgExpr * Create(const ASTContext &C, SourceLocation Loc, ParmVarDecl *Param, DeclContext *UsedContext)
Definition: ExprCXX.h:1229
clang::sema::CapturingScopeInfo
Definition: ScopeInfo.h:628
clang::OMPDeclareMapperDecl
This represents &#39;#pragma omp declare mapper ...&#39; directive.
Definition: DeclOpenMP.h:217
clang::InitializedEntity::setParameterCFAudited
void setParameterCFAudited()
Definition: Initialization.h:524
clang::Stmt::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:263
clang::OMF_init
Definition: IdentifierTable.h:633
clang::Sema::DiagnoseCommaOperator
void DiagnoseCommaOperator(const Expr *LHS, SourceLocation Loc)
Definition: SemaExpr.cpp:12147
clang::Sema::ExpressionEvaluationContext
ExpressionEvaluationContext
Describes how the expressions currently being parsed are evaluated at run-time, if at all...
Definition: Sema.h:1023
BuildFloatingLiteral
static Expr * BuildFloatingLiteral(Sema &S, NumericLiteralParser &Literal, QualType Ty, SourceLocation Loc)
Definition: SemaExpr.cpp:3451
clang::StringLiteral
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1711
TargetInfo.h
Defines the clang::TargetInfo interface.
clang::Type::isComplexIntegerType
bool isComplexIntegerType() const
Definition: Type.cpp:539
clang::CallExpr
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2546
castKindToImplicitConversionKind
static ImplicitConversionKind castKindToImplicitConversionKind(CastKind CK)
Definition: SemaExpr.cpp:10540
clang::Sema::CheckVectorOperands
QualType CheckVectorOperands(ExprResult &LHS, ExprResult &RHS, SourceLocation Loc, bool IsCompAssign, bool AllowBothBool, bool AllowBoolConversion)
type checking for vector binary operators.
Definition: SemaExpr.cpp:9130
clang::TargetCXXABI::isMicrosoft
bool isMicrosoft() const
Is this ABI an MSVC-compatible ABI?
Definition: TargetCXXABI.h:160
clang::Expr::MLV_Valid
Definition: Expr.h:279
clang::CUDAKernelCallExpr::Create
static CUDAKernelCallExpr * Create(const ASTContext &Ctx, Expr *Fn, CallExpr *Config, ArrayRef< Expr *> Args, QualType Ty, ExprValueKind VK, SourceLocation RP, unsigned MinNumArgs=0)
Definition: ExprCXX.cpp:1746
clang::FunctionDecl::getSourceRange
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: Decl.cpp:3868
clang::sema::CapturingScopeInfo::HasImplicitReturnType
bool HasImplicitReturnType
Definition: ScopeInfo.h:655
clang::NamedDecl::getName
StringRef getName() const
Get the name of identifier for this declaration as a StringRef.
Definition: Decl.h:250
clang::Qualifiers::getCVRQualifiers
unsigned getCVRQualifiers() const
Definition: Type.h:276
clang::ExprError
ExprResult ExprError()
Definition: Ownership.h:279
clang::NumericLiteralParser
NumericLiteralParser - This performs strict semantic analysis of the content of a ppnumber...
Definition: LiteralSupport.h:42
clang::Sema::PerformObjectMemberConversion
ExprResult PerformObjectMemberConversion(Expr *From, NestedNameSpecifier *Qualifier, NamedDecl *FoundDecl, NamedDecl *Member)
Cast a base object to a member&#39;s actual type.
Definition: SemaExpr.cpp:2778
clang::TypeInfo::Width
uint64_t Width
Definition: ASTContext.h:157
clang::ASTContext::IntTy
CanQualType IntTy
Definition: ASTContext.h:1025
clang::CR_OpenMP
Definition: CapturedStmt.h:19
clang::NonOdrUseReason
NonOdrUseReason
The reason why a DeclRefExpr does not constitute an odr-use.
Definition: Specifiers.h:160
clang::VectorType::getNumElements
unsigned getNumElements() const
Definition: Type.h:3271
clang::SC_Register
Definition: Specifiers.h:244
clang::ObjCBoolLiteralExpr
ObjCBoolLiteralExpr - Objective-C Boolean Literal.
Definition: ExprObjC.h:85
clang::Sema::AssumedTemplateKind
AssumedTemplateKind
Definition: Sema.h:6875
clang::Redeclarable::getMostRecentDecl
decl_type * getMostRecentDecl()
Returns the most recent (re)declaration of this declaration.
Definition: Redeclarable.h:225
clang::TNK_Var_template
The name refers to a variable template whose specialization produces a variable.
Definition: TemplateKinds.h:33
clang::Type::isDependentType
bool isDependentType() const
Whether this type is a dependent type, meaning that its definition somehow depends on a template para...
Definition: Type.h:2150
clang::CallExpr::ADLCallKind
ADLCallKind
Definition: Expr.h:2593
tryImplicitlyCaptureThisIfImplicitMemberFunctionAccessWithDependentArgs
static void tryImplicitlyCaptureThisIfImplicitMemberFunctionAccessWithDependentArgs(Sema &S, const UnresolvedMemberExpr *const UME, SourceLocation CallLoc)
Definition: SemaExpr.cpp:5667
clang::MemberExpr::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.cpp:1751
clang::DeclRefExpr
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1171
clang::DiagnosticsEngine::isIgnored
bool isIgnored(unsigned DiagID, SourceLocation Loc) const
Determine whether the diagnostic is known to be ignored.
Definition: Diagnostic.h:825
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The class facilities generation and storage of conversion FixIts.
Definition: SemaFixItUtils.h:32
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Definition: AnalysisBasedWarnings.h:34
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Expr * getRHS() const
Definition: Expr.h:3476
clang::Sema::BuildVAArgExpr
ExprResult BuildVAArgExpr(SourceLocation BuiltinLoc, Expr *E, TypeSourceInfo *TInfo, SourceLocation RPLoc)
Definition: SemaExpr.cpp:14562
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bool isDeleted() const
Whether this function has been deleted.
Definition: Decl.h:2259
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bool isPointerType() const
Definition: Type.h:6504
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bool isBitwiseOp() const
Definition: Expr.h:3516
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bool isIncrementDecrementOp() const
Definition: Expr.h:2120
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Definition: Type.h:4240
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ExprResult ActOnStringLiteral(ArrayRef< Token > StringToks, Scope *UDLScope=nullptr)
ActOnStringLiteral - The specified tokens were lexed as pasted string fragments (e.g.
Definition: SemaExpr.cpp:1731
clang::BinaryOperator::getOverloadedOperator
static OverloadedOperatorKind getOverloadedOperator(Opcode Opc)
Retrieve the overloaded operator kind that corresponds to the given binary opcode.
Definition: Expr.cpp:2094
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BasePaths - Represents the set of paths from a derived class to one of its (direct or indirect) bases...
Definition: CXXInheritance.h:118
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Return the size of the specified (complete) type T, in characters.
Definition: ASTContext.cpp:2379
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Annotates a diagnostic with some code that should be inserted, removed, or replaced to fix the proble...
Definition: Diagnostic.h:66
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Definition: OperatorPrecedence.h:28
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Definition: LangStandard.h:49
clang::TypeLoc::initializeFullCopy
void initializeFullCopy(TypeLoc Other)
Initializes this by copying its information from another TypeLoc of the same type.
Definition: TypeLoc.h:202
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DeclaratorContext getContext() const
Definition: DeclSpec.h:1920
clang::VarDecl::isStaticDataMember
bool isStaticDataMember() const
Determines whether this is a static data member.
Definition: Decl.h:1144
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void suppressDiagnostics()
Suppress the diagnostics that would normally fire because of this lookup.
Definition: Lookup.h:583
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void setLocation(SourceLocation L)
Definition: Token.h:134
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T * getAs()
Definition: Ownership.h:171
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Definition: Decl.h:630
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Definition: Expr.h:282
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An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:129
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bool empty() const
Return true if no decls were found.
Definition: Lookup.h:339
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bool isFloatingType() const
Definition: Type.cpp:2005
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Definition: ExceptionSpecificationType.h:49
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A trivial tuple used to represent a source range.
Definition: SourceLocation.h:207
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bool Variadic
Definition: Type.h:3839
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ASTContext & Context
Definition: Sema.h:385
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FunctionDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: Decl.cpp:3158
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SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.cpp:1531
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IncompatibleObjCQualifiedId - The assignment is between a qualified id type and something else (that ...
Definition: Sema.h:10695
clang::Sema::CheckBooleanCondition
ExprResult CheckBooleanCondition(SourceLocation Loc, Expr *E, bool IsConstexpr=false)
CheckBooleanCondition - Diagnose problems involving the use of the given expression as a boolean cond...
Definition: SemaExpr.cpp:17403
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Definition: DeclarationName.h:209
clang::NamedDecl
This represents a decl that may have a name.
Definition: Decl.h:223
clang::UnqualifiedId::setIdentifier
void setIdentifier(const IdentifierInfo *Id, SourceLocation IdLoc)
Specify that this unqualified-id was parsed as an identifier.
Definition: DeclSpec.h:1049
clang::ASTContext::getObjCObjectPointerType
QualType getObjCObjectPointerType(QualType OIT) const
Return a ObjCObjectPointerType type for the given ObjCObjectType.
Definition: ASTContext.cpp:4969
clang::Builtin::Context::hasCustomTypechecking
bool hasCustomTypechecking(unsigned ID) const
Determines whether this builtin has custom typechecking.
Definition: Builtins.h:157
clang::Sema::BuildVectorLiteral
ExprResult BuildVectorLiteral(SourceLocation LParenLoc, SourceLocation RParenLoc, Expr *E, TypeSourceInfo *TInfo)
Build an altivec or OpenCL literal.
Definition: SemaExpr.cpp:6846
clang::DeclRefExpr::getQualifier
NestedNameSpecifier * getQualifier() const
If the name was qualified, retrieves the nested-name-specifier that precedes the name.
Definition: Expr.h:1274
clang::Sema::ExpressionEvaluationContextRecord::VolatileAssignmentLHSs
SmallVector< Expr *, 2 > VolatileAssignmentLHSs
Expressions appearing as the LHS of a volatile assignment in this context.
Definition: Sema.h:1112
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Opcode
Definition: Opcode.h:21
clang::ASTContext::BoolTy
CanQualType BoolTy
Definition: ASTContext.h:1017
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Represents a C array with a specified size that is not an integer-constant-expression.
Definition: Type.h:3039
clang::sema::CapturedRegionScopeInfo::OpenMPCaptureLevel
unsigned short OpenMPCaptureLevel
Definition: ScopeInfo.h:760
clang::Sema::CheckCallReturnType
bool CheckCallReturnType(QualType ReturnType, SourceLocation Loc, CallExpr *CE, FunctionDecl *FD)
CheckCallReturnType - Checks that a call expression&#39;s return type is complete.
Definition: SemaExpr.cpp:17275
clang::ETK_None
No keyword precedes the qualified type name.
Definition: Type.h:5227
clang::Sema::getCurLambda
sema::LambdaScopeInfo * getCurLambda(bool IgnoreNonLambdaCapturingScope=false)
Retrieve the current lambda scope info, if any.
Definition: Sema.cpp:1882
clang::Sema::BuildBinOp
ExprResult BuildBinOp(Scope *S, SourceLocation OpLoc, BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr)
Definition: SemaExpr.cpp:13460
clang::VarDecl::isInline
bool isInline() const
Whether this variable is (C++1z) inline.
Definition: Decl.h:1394
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APSInt & getInt()
Definition: APValue.h:380
clang::ObjCIvarDecl::getAccessControl
AccessControl getAccessControl() const
Definition: DeclObjC.h:1998
clang::LookupResult::begin
iterator begin() const
Definition: Lookup.h:335
clang::ASTContext::DoubleTy
CanQualType DoubleTy
Definition: ASTContext.h:1028
clang::Expr::IgnoreParenNoopCasts
Expr * IgnoreParenNoopCasts(const ASTContext &Ctx) LLVM_READONLY
Skip past any parenthese and casts which do not change the value (including ptr->int casts of the sam...
Definition: Expr.cpp:3022
clang::LookupResult::getNameLoc
SourceLocation getNameLoc() const
Gets the location of the identifier.
Definition: Lookup.h:606
clang::Expr::MLV_ConstAddrSpace
Definition: Expr.h:288
clang::ASTContext::isObjCNSObjectType
static bool isObjCNSObjectType(QualType Ty)
Return true if this is an NSObject object with its NSObject attribute set.
Definition: ASTContext.h:2084
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Describes an entity that is being initialized.
Definition: Initialization.h:48
clang::Type::isFunctionPointerType
bool isFunctionPointerType() const
Definition: Type.h:6538
clang::TemplateIdAnnotation::NumArgs
unsigned NumArgs
NumArgs - The number of template arguments.
Definition: ParsedTemplate.h:184
clang::LookupResult::getRepresentativeDecl
NamedDecl * getRepresentativeDecl() const
Fetches a representative decl. Useful for lazy diagnostics.
Definition: Lookup.h:524
clang::Sema::DiagnoseSentinelCalls
void DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, ArrayRef< Expr *> Args)
DiagnoseSentinelCalls - This routine checks whether a call or message-send is to a declaration with t...
Definition: SemaExpr.cpp:370
clang::StandardConversionSequence::setToType
void setToType(unsigned Idx, QualType T)
Definition: Overload.h:332
clang::Sema::CheckEnableIf
EnableIfAttr * CheckEnableIf(FunctionDecl *Function, ArrayRef< Expr *> Args, bool MissingImplicitThis=false)
Check the enable_if expressions on the given function.
Definition: SemaOverload.cpp:6517
DiagnoseUnusedOfDecl
static void DiagnoseUnusedOfDecl(Sema &S, NamedDecl *D, SourceLocation Loc)
Definition: SemaExpr.cpp:85
checkOpenCLConditionVector
static bool checkOpenCLConditionVector(Sema &S, Expr *Cond, SourceLocation QuestionLoc)
Return false if this is a valid OpenCL condition vector.
Definition: SemaExpr.cpp:7356
clang::FunctionDecl::getNumParams
unsigned getNumParams() const
Return the number of parameters this function must have based on its FunctionType.
Definition: Decl.cpp:3242
clang::ValueDecl::setType
void setType(QualType newType)
Definition: Decl.h:631
clang::Qualifiers::removeAddressSpace
void removeAddressSpace()
Definition: Type.h:384
CheckCompleteParameterTypesForMangler
static void CheckCompleteParameterTypesForMangler(Sema &S, FunctionDecl *FD, SourceLocation Loc)
Require that all of the parameter types of function be complete.
Definition: SemaExpr.cpp:15432
clang::BinaryOperator::isComparisonOp
static bool isComparisonOp(Opcode Opc)
Definition: Expr.h:3524
clang::OpaquePtr< QualType >::getFromOpaquePtr
static OpaquePtr getFromOpaquePtr(void *P)
Definition: Ownership.h:91
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bool hasInit() const
Definition: Decl.cpp:2226
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SourceLocation getBegin() const
Definition: SourceLocation.h:216
clang::Sema::AssignmentAction
AssignmentAction
Definition: Sema.h:2922
ColonLoc
SourceLocation ColonLoc
Location of &#39;:&#39;.
Definition: OpenMPClause.h:107
clang::ASTContext::getLangOpts
const LangOptions & getLangOpts() const
Definition: ASTContext.h:724
clang::DeclContext::getInnermostBlockDecl
const BlockDecl * getInnermostBlockDecl() const
Return this DeclContext if it is a BlockDecl.
Definition: DeclBase.cpp:1058
clang::TypoCorrection::WillReplaceSpecifier
void WillReplaceSpecifier(bool ForceReplacement)
Definition: TypoCorrection.h:100
captureInBlock
static bool captureInBlock(BlockScopeInfo *BSI, VarDecl *Var, SourceLocation Loc, const bool BuildAndDiagnose, QualType &CaptureType, QualType &DeclRefType, const bool Nested, Sema &S, bool Invalid)
Definition: SemaExpr.cpp:15947
clang::sema::Capture::isBlockCapture
bool isBlockCapture() const
Definition: ScopeInfo.h:586
clang::UnqualifiedIdKind::IK_ImplicitSelfParam
An implicit &#39;self&#39; parameter.
clang::Sema::LOLR_Error
The lookup resulted in an error.
Definition: Sema.h:3537
checkObjCPointerIntrospection
static void checkObjCPointerIntrospection(Sema &S, ExprResult &L, ExprResult &R, SourceLocation OpLoc)
Check if a bitwise-& is performed on an Objective-C pointer.
Definition: SemaExpr.cpp:12798
clang::ConstantArrayType
Represents the canonical version of C arrays with a specified constant size.
Definition: Type.h:2935
IsArithmeticOp
static bool IsArithmeticOp(BinaryOperatorKind Opc)
Definition: SemaExpr.cpp:7744
clang::Sema::IncompatibleNestedPointerQualifiers
IncompatibleNestedPointerQualifiers - The assignment is between two nested pointer types...
Definition: Sema.h:10678
clang::ASTContext::isPromotableBitField
QualType isPromotableBitField(Expr *E) const
Whether this is a promotable bitfield reference according to C99 6.3.1.1p2, bullet 2 (and GCC extensi...
Definition: ASTContext.cpp:5954
Builtins.h
Defines enum values for all the target-independent builtin functions.
clang::FunctionTemplateDecl
Declaration of a template function.
Definition: DeclTemplate.h:977
clang::ObjCIvarRefExpr::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: ExprObjC.h:592
clang::DeclResult
ActionResult< Decl * > DeclResult
Definition: Ownership.h:269
clang::FunctionType::ExtInfo
A class which abstracts out some details necessary for making a call.
Definition: Type.h:3533
clang::interp::Sub
bool Sub(InterpState &S, CodePtr OpPC)
Definition: Interp.h:140
isImplicitlyDefinableConstexprFunction
static bool isImplicitlyDefinableConstexprFunction(FunctionDecl *Func)
Definition: SemaExpr.cpp:15517
clang::Sema::ExpressionEvaluationContext::UnevaluatedList
The current expression occurs within a braced-init-list within an unevaluated operand.
clang::Expr::NullPointerConstantKind
NullPointerConstantKind
Enumeration used to describe the kind of Null pointer constant returned from isNullPointerConstant()...
Definition: Expr.h:710
clang::Sema::ConditionResult
Definition: Sema.h:11024
clang::AvailabilitySpec
One specifier in an expression.
Definition: Availability.h:30
clang::ElaboratedTypeLoc::setElaboratedKeywordLoc
void setElaboratedKeywordLoc(SourceLocation Loc)
Definition: TypeLoc.h:2096
clang::Attr
Attr - This represents one attribute.
Definition: Attr.h:45
clang::Decl::getLocation
SourceLocation getLocation() const
Definition: DeclBase.h:429
clang::Type::isIncompleteOrObjectType
bool isIncompleteOrObjectType() const
Return true if this is an incomplete or object type, in other words, not a function type...
Definition: Type.h:1926
CastType
CastType
Definition: SemaCast.cpp:45
clang::Token::startToken
void startToken()
Reset all flags to cleared.
Definition: Token.h:171
clang::Sema::ActOnAddrLabel
ExprResult ActOnAddrLabel(SourceLocation OpLoc, SourceLocation LabLoc, LabelDecl *TheDecl)
ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
Definition: SemaExpr.cpp:13891
clang::NamedDecl::isExternallyVisible
bool isExternallyVisible() const
Definition: Decl.h:362
clang::UETT_OpenMPRequiredSimdAlign
Definition: TypeTraits.h:102
checkEnumArithmeticConversions
static void checkEnumArithmeticConversions(Sema &S, Expr *LHS, Expr *RHS, SourceLocation Loc, Sema::ArithConvKind ACK)
Check that the usual arithmetic conversions can be performed on this pair of expressions that might b...
Definition: SemaExpr.cpp:1372
clang::Sema::CheckAddressOfOperand
QualType CheckAddressOfOperand(ExprResult &Operand, SourceLocation OpLoc)
CheckAddressOfOperand - The operand of & must be either a function designator or an lvalue designatin...
Definition: SemaExpr.cpp:12403
clang::TypeSourceInfo::getType
QualType getType() const
Return the type wrapped by this type source info.
Definition: Type.h:6238
clang::IdentifierInfo::isEditorPlaceholder
bool isEditorPlaceholder() const
Return true if this identifier is an editor placeholder.
Definition: IdentifierTable.h:383
clang::TemplateIdAnnotation::Template
ParsedTemplateTy Template
The declaration of the template corresponding to the template-name.
Definition: ParsedTemplate.h:170
clang::ObjCMethodDecl::parameters
ArrayRef< ParmVarDecl * > parameters() const
Definition: DeclObjC.h:368
diagnoseArithmeticOnNullPointer
static void diagnoseArithmeticOnNullPointer(Sema &S, SourceLocation Loc, Expr *Pointer, bool IsGNUIdiom)
Diagnose invalid arithmetic on a null pointer.
Definition: SemaExpr.cpp:9473
clang::ASTContext::getComplexType
QualType getComplexType(QualType T) const
Return the uniqued reference to the type for a complex number with the specified element type...
Definition: ASTContext.cpp:3070
clang::ASTContext::getIntTypeForBitwidth
QualType getIntTypeForBitwidth(unsigned DestWidth, unsigned Signed) const
getIntTypeForBitwidth - sets integer QualTy according to specified details: bitwidth, signed/unsigned.
Definition: ASTContext.cpp:10373
clang::Sema::ActOnBlockError
void ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope)
ActOnBlockError - If there is an error parsing a block, this callback is invoked to pop the informati...
Definition: SemaExpr.cpp:14358
diagnoseUseOfInternalDeclInInlineFunction
static void diagnoseUseOfInternalDeclInInlineFunction(Sema &S, const NamedDecl *D, SourceLocation Loc)
Check whether we&#39;re in an extern inline function and referring to a variable or function with interna...
Definition: SemaExpr.cpp:140
clang::Sema::SemaDiagnosticBuilder
Helper class that creates diagnostics with optional template instantiation stacks.
Definition: Sema.h:1392
clang::Expr::IgnoreParens
Expr * IgnoreParens() LLVM_READONLY
Skip past any parentheses which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2991
OriginalExprKind
OriginalExprKind
Definition: SemaExpr.cpp:11750
clang::ASTContext::UnsignedIntTy
CanQualType UnsignedIntTy
Definition: ASTContext.h:1026
clang::FunctionDecl::getPointOfInstantiation
SourceLocation getPointOfInstantiation() const
Retrieve the (first) point of instantiation of a function template specialization or a member of a cl...
Definition: Decl.cpp:3833
clang::ASTContext::getSizeType
CanQualType getSizeType() const
Return the unique type for "size_t" (C99 7.17), defined in <stddef.h>.
Definition: ASTContext.cpp:5250
clang::Type::STK_Integral
Definition: Type.h:2138
clang::QualType::getObjCLifetime
Qualifiers::ObjCLifetime getObjCLifetime() const
Returns lifetime attribute of this type.
Definition: Type.h:1080
RecordModifiableNonNullParam
static void RecordModifiableNonNullParam(Sema &S, const Expr *Exp)
Definition: SemaExpr.cpp:12619
clang::Sema::ContextRAII
A RAII object to temporarily push a declaration context.
Definition: Sema.h:816
clang::Sema::getVariadicCallType
VariadicCallType getVariadicCallType(FunctionDecl *FDecl, const FunctionProtoType *Proto, Expr *Fn)
Definition: SemaExpr.cpp:5057
clang::ObjCObjectPointerType::getPointeeType
QualType getPointeeType() const
Gets the type pointed to by this ObjC pointer.
Definition: Type.h:5967
clang::StandardConversionSequence
StandardConversionSequence - represents a standard conversion sequence (C++ 13.3.3.1.1).
Definition: Overload.h:256
CheckRealImagOperand
static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc, bool IsReal)
Definition: SemaExpr.cpp:4371