Add support for API accessors that prohibit overwriting by accessors...

src/api.cc

 // Copyright 2007-2008 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 683 matching lines @@
   HandleScope scope;
   i::Handle<i::AccessorInfo> obj = i::Factory::NewAccessorInfo();
   ASSERT(getter != NULL);
   obj->set_getter(*FromCData(getter));
   obj->set_setter(*FromCData(setter));
   if (data.IsEmpty()) data = v8::Undefined();
   obj->set_data(*Utils::OpenHandle(*data));
   obj->set_name(*Utils::OpenHandle(*name));
   if (settings & ALL_CAN_READ) obj->set_all_can_read(true);
   if (settings & ALL_CAN_WRITE) obj->set_all_can_write(true);
+  if (settings & PROHIBITS_OVERWRITING) obj->set_prohibits_overwriting(true);
   obj->set_property_attributes(static_cast<PropertyAttributes>(attributes));
 
   i::Handle<i::Object> list(Utils::OpenHandle(this)->property_accessors());
   if (list->IsUndefined()) {
     list = NeanderArray().value();
     Utils::OpenHandle(this)->set_property_accessors(*list);
   }
   NeanderArray array(list);
   array.add(obj);
 }
@@ skipping 1194 matching lines @@
 
 // Turns on access checks by copying the map and setting the check flag.
 // Because the object gets a new map, existing inline cache caching
 // the old map of this object will fail.
 void v8::Object::TurnOnAccessCheck() {
   ON_BAILOUT("v8::Object::TurnOnAccessCheck()", return);
   i::Handle<i::JSObject> obj = Utils::OpenHandle(this);
 
   i::Handle<i::Map> new_map =
     i::Factory::CopyMapDropTransitions(i::Handle<i::Map>(obj->map()));
-  new_map->set_is_access_check_needed();
+  new_map->set_is_access_check_needed(true);
   obj->set_map(*new_map);
 }
 
 
 Local<v8::Object> Function::NewInstance() {
   return NewInstance(0, NULL);
 }
 
 
 Local<v8::Object> Function::NewInstance(int argc,
@@ skipping 1037 matching lines @@
       reinterpret_cast<HandleScopeImplementer*>(storage);
   List<void**>* blocks_of_archived_thread = thread_local->Blocks();
   ImplementationUtilities::HandleScopeData* handle_data_of_archived_thread =
       &thread_local->handle_scope_data_;
   Iterate(v, blocks_of_archived_thread, handle_data_of_archived_thread);
 
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal