Implemented Object.keys.

src/handles.cc

 // Copyright 2009 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 509 matching lines @@
     {
       // Leaving JavaScript.
       VMState state(EXTERNAL);
       result = enum_fun(info);
     }
   }
   return result;
 }
 
 
-Handle<FixedArray> GetKeysInFixedArrayFor(Handle<JSObject> object) {
+Handle<FixedArray> GetKeysInFixedArrayFor(Handle<JSObject> object,
+                                          KeyCollectionType type) {
   Handle<FixedArray> content = Factory::empty_fixed_array();
 
   JSObject* arguments_boilerplate =
       Top::context()->global_context()->arguments_boilerplate();
   JSFunction* arguments_function =
       JSFunction::cast(arguments_boilerplate->map()->constructor());
   bool allow_enumeration = (object->map()->constructor() != arguments_function);
 
   // Only collect keys if access is permitted.
   if (allow_enumeration) {
@@ skipping 27 matching lines @@
       // Compute the property keys.
       content = UnionOfKeys(content, GetEnumPropertyKeys(current));
 
       // Add the property keys from the interceptor.
       if (current->HasNamedInterceptor()) {
         v8::Handle<v8::Array> result =
             GetKeysForNamedInterceptor(object, current);
         if (!result.IsEmpty())
           content = AddKeysFromJSArray(content, v8::Utils::OpenHandle(*result));
       }
+
+      // If we only want local properties we bail out after the first
+      // iteration.
+      if (type == LOCAL_ONLY)
+        break;
     }
   }
   return content;
 }
 
 
 Handle<JSArray> GetKeysFor(Handle<JSObject> object) {
   Counters::for_in.Increment();
-  Handle<FixedArray> elements = GetKeysInFixedArrayFor(object);
+  Handle<FixedArray> elements = GetKeysInFixedArrayFor(object,
+                                                       INCLUDE_PROTOS);
   return Factory::NewJSArrayWithElements(elements);
 }
 
 
 Handle<FixedArray> GetEnumPropertyKeys(Handle<JSObject> object) {
   int index = 0;
   if (object->HasFastProperties()) {
     if (object->map()->instance_descriptors()->HasEnumCache()) {
       Counters::enum_cache_hits.Increment();
       DescriptorArray* desc = object->map()->instance_descriptors();
@@ skipping 161 matching lines @@
   Handle<Map> new_map = Factory::CopyMapDropTransitions(old_map);
   obj->set_map(*new_map);
   new_map->set_needs_loading(true);
   // Store the lazy loading info in the constructor field.  We'll
   // reestablish the constructor from the fixed array after loading.
   new_map->set_constructor(*arr);
   ASSERT(!obj->IsLoaded());
 }
 
 } }  // namespace v8::internal