Fix for issue 339:...

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 255 matching lines @@
 
 
 Handle<Object> GetPrototype(Handle<Object> obj) {
   Handle<Object> result(obj->GetPrototype());
   return result;
 }
 
 
 Handle<Object> GetHiddenProperties(Handle<JSObject> obj,
                                    bool create_if_needed) {
-  CALL_HEAP_FUNCTION(obj->GetHiddenProperties(create_if_needed), Object);
+  Handle<String> key = Factory::hidden_symbol();
+
+  if (obj->HasFastProperties()) {
+    // If the object has fast properties, check whether the first slot
+    // in the descriptor array matches the hidden symbol. Since the
+    // hidden symbols hash code is zero (and no other string has hash
+    // code zero) it will always occupy the first entry if present.
+    DescriptorArray* descriptors = obj->map()->instance_descriptors();
+    DescriptorReader r(descriptors);
+    if (!r.eos() && (r.GetKey() == *key) && r.IsProperty()) {
+      ASSERT(r.type() == FIELD);
+      return Handle<Object>(obj->FastPropertyAt(r.GetFieldIndex()));
+    }
+  }
+
+  // Only attempt to find the hidden properties in the local object and not
+  // in the prototype chain.  Note that HasLocalProperty() can cause a GC in
+  // the general case in the presence of interceptors.
+  if (!obj->HasLocalProperty(*key)) {
+    // Hidden properties object not found. Allocate a new hidden properties
+    // object if requested. Otherwise return the undefined value.
+    if (create_if_needed) {
+      Handle<Object> hidden_obj = Factory::NewJSObject(Top::object_function());
+      return SetProperty(obj, key, hidden_obj, DONT_ENUM);
+    } else {
+      return Factory::undefined_value();
+    }
+  }
+  return GetProperty(obj, key);
 }
 
 
 Handle<Object> DeleteElement(Handle<JSObject> obj,
                              uint32_t index) {
   CALL_HEAP_FUNCTION(obj->DeleteElement(index), Object);
 }
 
 
 Handle<Object> DeleteProperty(Handle<JSObject> obj,
@@ skipping 416 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