Bug 1309 non-extensible objects have immutable __Proto__

src/frames-inl.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 130 matching lines @@
 }
 
 
 inline bool StandardFrame::IsConstructFrame(Address fp) {
   Object* marker =
       Memory::Object_at(fp + StandardFrameConstants::kMarkerOffset);
   return marker == Smi::FromInt(CONSTRUCT);
 }
 
 
+Address JavaScriptFrame::GetParameterSlot(int index) const {
+  int param_count = ComputeParametersCount();
+  ASSERT(-1 <= index && index < param_count);
+  int parameter_offset = (param_count - index - 1) * kPointerSize;
+  return caller_sp() + parameter_offset;
+}
+
+
+Object* JavaScriptFrame::GetParameter(int index) const {
+  return Memory::Object_at(GetParameterSlot(index));
+}
+
+
 inline Object* JavaScriptFrame::receiver() const {
-  const int offset = JavaScriptFrameConstants::kReceiverOffset;
-  return Memory::Object_at(caller_sp() + offset);
+  return GetParameter(-1);
 }
 
 
 inline void JavaScriptFrame::set_receiver(Object* value) {
-  const int offset = JavaScriptFrameConstants::kReceiverOffset;
-  Memory::Object_at(caller_sp() + offset) = value;
+  Memory::Object_at(GetParameterSlot(-1)) = value;
 }
 
 
 inline bool JavaScriptFrame::has_adapted_arguments() const {
   return IsArgumentsAdaptorFrame(caller_fp());
 }
 
 
 inline Object* JavaScriptFrame::function() const {
   Object* result = function_slot_object();
@@ skipping 57 matching lines @@
 template<typename Iterator>
 void JavaScriptFrameIteratorTemp<Iterator>::Reset() {
   iterator_.Reset();
   if (!done()) Advance();
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_INL_H_