Implement loads and calls from 'super'

src/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 2054 matching lines @@
   return *clone;
 }
 
 
 RUNTIME_FUNCTION(Runtime_HomeObjectSymbol) {
   DCHECK(args.length() == 0);
   return isolate->heap()->home_object_symbol();
 }
 
 
+RUNTIME_FUNCTION(Runtime_LoadFromSuper) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 3);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, base_value, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Name, name, 2);
+
+  LookupIterator it(receiver, name, base_value);
+  it.LookupForRead();

[Toon Verwaest, 2014/09/15 11:57:20]

I don't understand why you need this weird setup. Why not just do
Object::GetProperty(&it) immediately?

[Dmitry Lomov (no reviews), 2014/09/15 12:31:12]

Done.

+  Handle<Object> result;
+  if (it.IsFound()) {
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
+                                       Object::GetProperty(&it));
+    return *result;
+  }
+  return isolate->heap()->undefined_value();
+}
+
+
 RUNTIME_FUNCTION(Runtime_IsExtensible) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(JSObject, obj, 0);
   if (obj->IsJSGlobalProxy()) {
     PrototypeIterator iter(isolate, obj);
     if (iter.IsAtEnd()) return isolate->heap()->false_value();
     DCHECK(iter.GetCurrent()->IsJSGlobalObject());
     obj = JSObject::cast(iter.GetCurrent());
   }
@@ skipping 13572 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal