[Arguments] Introduce a new backing store for non-strict arguments objects.

src/accessors.cc

 // 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 715 matching lines @@
   }
 
   UNREACHABLE();
 }
 
 
 static MaybeObject* ConstructArgumentsObjectForInlinedFunction(
     JavaScriptFrame* frame,
     Handle<JSFunction> inlined_function,
     int inlined_frame_index) {
+  UNIMPLEMENTED();

[Kevin Millikin (Chromium), 2011/03/23 16:07:20]

I have placed UNIMPLEMENTED() in places that will need to change or be inspected
to make sure they still work.

   Factory* factory = Isolate::Current()->factory();
   int args_count = inlined_function->shared()->formal_parameter_count();
   ScopedVector<SlotRef> args_slots(args_count);
   ComputeSlotMappingForArguments(frame, inlined_frame_index, &args_slots);
   Handle<JSObject> arguments =
       factory->NewArgumentsObject(inlined_function, args_count);
   Handle<FixedArray> array = factory->NewFixedArray(args_count);
   for (int i = 0; i < args_count; ++i) {
     Handle<Object> value = args_slots[i].GetValue();
     array->set(i, *value);
@@ skipping 169 matching lines @@
 }
 
 
 const AccessorDescriptor Accessors::ObjectPrototype = {
   ObjectGetPrototype,
   ObjectSetPrototype,
   0
 };
 
 } }  // namespace v8::internal