Treat generator functions as normal functions when evaluating and specializing.

Author: markshannon

Python/ceval.c

@@ -4592,28 +4592,25 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, InterpreterFrame *frame, int thr
             // Check if the call can be inlined or not
             if (Py_TYPE(function) == &PyFunction_Type && tstate->interp->eval_frame == NULL) {
                 int code_flags = ((PyCodeObject*)PyFunction_GET_CODE(function))->co_flags;
-                int is_generator = code_flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR);
-                if (!is_generator) {
-                    PyObject *locals = code_flags & CO_OPTIMIZED ? NULL : PyFunction_GET_GLOBALS(function);
-                    STACK_SHRINK(oparg);
-                    InterpreterFrame *new_frame = _PyEvalFramePushAndInit(
-                        tstate, (PyFunctionObject *)function, locals,
-                        stack_pointer, nargs, kwnames
-                    );
-                    STACK_SHRINK(postcall_shrink);
-                    RESET_STACK_ADJUST_FOR_CALLS;
-                    // The frame has stolen all the arguments from the stack,
-                    // so there is no need to clean them up.
-                    Py_XDECREF(kwnames);
-                    Py_DECREF(function);
-                    if (new_frame == NULL) {
-                        goto error;
-                    }
-                    _PyFrame_SetStackPointer(frame, stack_pointer);
-                    new_frame->previous = frame;
-                    cframe.current_frame = frame = new_frame;
-                    goto start_frame;
+                PyObject *locals = code_flags & CO_OPTIMIZED ? NULL : PyFunction_GET_GLOBALS(function);
+                STACK_SHRINK(oparg);
+                InterpreterFrame *new_frame = _PyEvalFramePushAndInit(
+                    tstate, (PyFunctionObject *)function, locals,
+                    stack_pointer, nargs, kwnames
+                );
+                STACK_SHRINK(postcall_shrink);
+                RESET_STACK_ADJUST_FOR_CALLS;
+                // The frame has stolen all the arguments from the stack,
+                // so there is no need to clean them up.
+                Py_XDECREF(kwnames);
+                Py_DECREF(function);
+                if (new_frame == NULL) {
+                    goto error;
                 }
+                _PyFrame_SetStackPointer(frame, stack_pointer);
+                new_frame->previous = frame;
+                cframe.current_frame = frame = new_frame;
+                goto start_frame;
             }
             /* Callable is not a normal Python function */
             PyObject *res;

Python/specialize.c

@@ -1153,9 +1153,6 @@ _Py_IDENTIFIER(__getitem__);
 static int
 function_kind(PyCodeObject *code) {
     int flags = code->co_flags;
-    if (flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR)) {
-        return SPEC_FAIL_GENERATOR;
-    }
     if ((flags & (CO_VARKEYWORDS | CO_VARARGS)) || code->co_kwonlyargcount) {
         return SPEC_FAIL_COMPLEX_PARAMETERS;
     }