ES6 symbols: Allow symbols as property names

src/bootstrapper.cc

 // Copyright 2012 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 2221 matching lines @@
 void Genesis::TransferNamedProperties(Handle<JSObject> from,
                                       Handle<JSObject> to) {
   if (from->HasFastProperties()) {
     Handle<DescriptorArray> descs =
         Handle<DescriptorArray>(from->map()->instance_descriptors());
     for (int i = 0; i < descs->number_of_descriptors(); i++) {
       PropertyDetails details = descs->GetDetails(i);
       switch (details.type()) {
         case FIELD: {
           HandleScope inner;
-          Handle<String> key = Handle<String>(descs->GetKey(i));
+          Handle<Name> key = Handle<Name>(descs->GetKey(i));
           int index = descs->GetFieldIndex(i);
           Handle<Object> value = Handle<Object>(from->FastPropertyAt(index));
           CHECK_NOT_EMPTY_HANDLE(to->GetIsolate(),
                                  JSObject::SetLocalPropertyIgnoreAttributes(
                                      to, key, value, details.attributes()));
           break;
         }
         case CONSTANT_FUNCTION: {
           HandleScope inner;
-          Handle<String> key = Handle<String>(descs->GetKey(i));
+          Handle<Name> key = Handle<Name>(descs->GetKey(i));
           Handle<JSFunction> fun =
               Handle<JSFunction>(descs->GetConstantFunction(i));
           CHECK_NOT_EMPTY_HANDLE(to->GetIsolate(),
                                  JSObject::SetLocalPropertyIgnoreAttributes(
                                      to, key, fun, details.attributes()));
           break;
         }
         case CALLBACKS: {
           LookupResult result(isolate());
           to->LocalLookup(descs->GetKey(i), &result);
           // If the property is already there we skip it
           if (result.IsFound()) continue;
           HandleScope inner;
           ASSERT(!to->HasFastProperties());
           // Add to dictionary.
-          Handle<String> key = Handle<String>(descs->GetKey(i));
+          Handle<Name> key = Handle<Name>(descs->GetKey(i));
           Handle<Object> callbacks(descs->GetCallbacksObject(i));
           PropertyDetails d = PropertyDetails(details.attributes(),
                                               CALLBACKS,
                                               details.descriptor_index());
           JSObject::SetNormalizedProperty(to, key, callbacks, d);
           break;
         }
         case NORMAL:
           // Do not occur since the from object has fast properties.
         case HANDLER:
         case INTERCEPTOR:
         case TRANSITION:
         case NONEXISTENT:
           // No element in instance descriptors have proxy or interceptor type.
           UNREACHABLE();
           break;
       }
     }
   } else {
-    Handle<StringDictionary> properties =
-        Handle<StringDictionary>(from->property_dictionary());
+    Handle<NameDictionary> properties =
+        Handle<NameDictionary>(from->property_dictionary());
     int capacity = properties->Capacity();
     for (int i = 0; i < capacity; i++) {
       Object* raw_key(properties->KeyAt(i));
       if (properties->IsKey(raw_key)) {
-        ASSERT(raw_key->IsString());
+        ASSERT(raw_key->IsName());
         // If the property is already there we skip it.
         LookupResult result(isolate());
-        to->LocalLookup(String::cast(raw_key), &result);
+        to->LocalLookup(Name::cast(raw_key), &result);
         if (result.IsFound()) continue;
         // Set the property.
-        Handle<String> key = Handle<String>(String::cast(raw_key));
+        Handle<Name> key = Handle<Name>(Name::cast(raw_key));
         Handle<Object> value = Handle<Object>(properties->ValueAt(i));
         if (value->IsJSGlobalPropertyCell()) {
           value = Handle<Object>(JSGlobalPropertyCell::cast(*value)->value());
         }
         PropertyDetails details = properties->DetailsAt(i);
         CHECK_NOT_EMPTY_HANDLE(to->GetIsolate(),
                                JSObject::SetLocalPropertyIgnoreAttributes(
                                    to, key, value, details.attributes()));
       }
     }
@@ skipping 130 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   ASSERT(!IsActive());
 }
 
 } }  // namespace v8::internal