More renaming of GEP offsets in abi/trans. This should settle it. Also, fix some overenthusiastic renaming in previous commit.

Author: froystig

src/boot/be/abi.ml

@@ -45,15 +45,20 @@ let stk_field_valgrind_id = 0 + 1;;
 let stk_field_limit = stk_field_valgrind_id + 1;;
 let stk_field_data = stk_field_limit + 1;;
 
-let obj_elt_vtbl = 0;;
-let obj_elt_body_box = 1;;
+(* Both obj and fn are two-word "bindings":  One word points to some
+ * static dispatch information (vtbl or thunk), and the other points to
+ * some bag of bound data (object-body or closure). *)
 
+let binding_field_dispatch = 0;;
+let binding_field_bound_data = 1;;
+
+let obj_field_vtbl = binding_field_dispatch;;
+let obj_field_body_box = binding_field_bound_data;;
 let obj_body_elt_tydesc = 0;;
 let obj_body_elt_fields = 1;;
 
-let fn_elt_thunk = 0;;
-let fn_elt_closure = 1;;
-
+let fn_field_thunk = binding_field_dispatch;;
+let fn_field_closure = binding_field_bound_data;;
 let closure_elt_rc = 0;;
 let closure_elt_target = 1;;
 let closure_elt_bound_args = 2;;

src/boot/me/trans.ml

@@ -890,7 +890,7 @@ let trans_visitor
     let sorted_idents = sorted_htab_keys fns in
     let i = arr_idx sorted_idents id in
     let fn_ty = Hashtbl.find fns id in
-    let table_ptr = get_element_ptr obj_cell Abi.obj_elt_vtbl in
+    let table_ptr = get_element_ptr obj_cell Abi.obj_field_vtbl in
       (get_vtbl_entry_idx table_ptr i, fn_ty)
   in
 
@@ -1479,10 +1479,10 @@ let trans_visitor
                  Abi.indirect_args_elt_closure)
       in
       let closure_target_cell =
-        get_element_ptr closure_cell Abi.obj_elt_body_box
+        get_element_ptr closure_cell Abi.fn_field_closure
       in
       let closure_target_fn_cell =
-        get_element_ptr closure_target_cell Abi.obj_elt_vtbl
+        get_element_ptr closure_target_cell Abi.fn_field_thunk
       in
 
         merge_bound_args
@@ -2473,7 +2473,7 @@ let trans_visitor
 
           Ast.TY_fn _ ->
             note_drop_step ty "drop_ty: fn path";
-            let binding = get_element_ptr cell Abi.obj_elt_body_box in
+            let binding = get_element_ptr cell Abi.fn_field_closure in
             let null_jmp = null_check binding in
               (* Drop non-null bindings. *)
               (* FIXME (issue #58): this is completely wrong, Closures need to
@@ -2486,7 +2486,7 @@ let trans_visitor
 
         | Ast.TY_obj _ ->
             note_drop_step ty "drop_ty: obj path";
-            let binding = get_element_ptr cell Abi.obj_elt_body_box in
+            let binding = get_element_ptr cell Abi.obj_field_body_box in
             let null_jmp = null_check binding in
             let rc_jmp = drop_refcount_and_cmp binding in
             let obj_box = deref binding in
@@ -2607,7 +2607,9 @@ let trans_visitor
         | Ast.TY_obj _ ->
             if type_has_state ty
             then
-              let binding = get_element_ptr cell Abi.obj_elt_body_box in
+              let binding =
+                get_element_ptr cell Abi.binding_field_bound_data
+              in
                 sever_box binding;
 
         | _ ->
@@ -3094,13 +3096,17 @@ let trans_visitor
           | Ast.TY_fn _
           | Ast.TY_obj _ ->
               begin
-                let src_item = get_element_ptr src Abi.obj_elt_vtbl in
-                let dst_item = get_element_ptr dst Abi.obj_elt_vtbl in
+                let src_item =
+                  get_element_ptr src Abi.binding_field_dispatch
+                in
+                let dst_item =
+                  get_element_ptr dst Abi.binding_field_dispatch
+                in
                 let src_binding =
-                  get_element_ptr src Abi.obj_elt_body_box
+                  get_element_ptr src Abi.binding_field_bound_data
                 in
                 let dst_binding =
-                  get_element_ptr dst Abi.obj_elt_body_box
+                  get_element_ptr dst Abi.binding_field_bound_data
                 in
                   mov dst_item (Il.Cell src_item);
                   let null_jmp = null_check src_binding in
@@ -3197,7 +3203,7 @@ let trans_visitor
                   deref_ty DEREF_none initializing dst_cell dst_ty
                 in
                 let caller_vtbl =
-                  get_element_ptr caller_obj Abi.obj_elt_vtbl
+                  get_element_ptr caller_obj Abi.obj_field_vtbl
                 in
                   mov caller_vtbl caller_vtbl_oper
               end
@@ -3235,10 +3241,10 @@ let trans_visitor
     let fix = Hashtbl.find cx.ctxt_fn_fixups item.id in
 
     let dst_pair_item_cell =
-      get_element_ptr dst_cell Abi.obj_elt_vtbl
+      get_element_ptr dst_cell Abi.fn_field_thunk
     in
     let dst_pair_binding_cell =
-      get_element_ptr dst_cell Abi.obj_elt_body_box
+      get_element_ptr dst_cell Abi.fn_field_closure
     in
       mov dst_pair_item_cell (crate_rel_imm fix);
       mov dst_pair_binding_cell zero
@@ -3472,12 +3478,12 @@ let trans_visitor
 
     iflog (fun _ -> annotate "set closure target code ptr");
     mov
-      (get_element_ptr targ_cell Abi.fn_elt_thunk)
+      (get_element_ptr targ_cell Abi.fn_field_thunk)
       (reify_ptr target_fn_ptr);
 
     iflog (fun _ -> annotate "set closure target closure ptr");
     mov
-      (get_element_ptr targ_cell Abi.fn_elt_closure)
+      (get_element_ptr targ_cell Abi.fn_field_closure)
       (reify_ptr target_binding_ptr);
 
     iflog (fun _ -> annotate "set closure bound args");
@@ -3511,10 +3517,10 @@ let trans_visitor
     let target_binding_ptr = callee_binding_ptr flv cc in
     let closure_rty = closure_referent_type bound_arg_slots in
     let closure_sz = force_sz (Il.referent_ty_size word_bits closure_rty) in
-    let fn_cell = get_element_ptr dst_cell Abi.obj_elt_vtbl in
+    let fn_cell = get_element_ptr dst_cell Abi.fn_field_thunk in
     let closure_cell =
       ptr_cast
-        (get_element_ptr dst_cell Abi.obj_elt_body_box)
+        (get_element_ptr dst_cell Abi.fn_field_closure)
         (Il.ScalarTy (Il.AddrTy (closure_rty)))
     in
       iflog (fun _ -> annotate "assign glue-code to fn slot of pair");
@@ -3824,7 +3830,7 @@ let trans_visitor
       | CALL_indirect ->
           (* fptr is a pair [disp, binding*] *)
           let pair_cell = need_cell (reify_ptr fptr) in
-          let disp_cell = get_element_ptr pair_cell Abi.obj_elt_vtbl in
+          let disp_cell = get_element_ptr pair_cell Abi.fn_field_thunk in
             Il.Cell (crate_rel_to_ptr (Il.Cell disp_cell) Il.CodeTy)
 
   and callee_binding_ptr
@@ -3835,7 +3841,7 @@ let trans_visitor
     then zero
     else
       let (pair_cell, _) = trans_lval pair_lval in
-        Il.Cell (get_element_ptr pair_cell Abi.obj_elt_body_box)
+        Il.Cell (get_element_ptr pair_cell Abi.fn_field_closure)
 
   and call_ctrl flv : call_ctrl =
     if lval_is_static cx flv
@@ -4639,10 +4645,10 @@ let trans_visitor
     let _ = iflog (fun _ -> annotate "load destination obj pair ptr") in
     let dst_pair_cell = deref (ptr_at (fp_imm out_mem_disp) obj_ty) in
     let dst_pair_item_cell =
-      get_element_ptr dst_pair_cell Abi.obj_elt_vtbl
+      get_element_ptr dst_pair_cell Abi.obj_field_vtbl
     in
     let dst_pair_state_cell =
-      get_element_ptr dst_pair_cell Abi.obj_elt_body_box
+      get_element_ptr dst_pair_cell Abi.obj_field_body_box
     in
 
       (* Load first cell of pair with vtbl ptr.*)