ES6 symbols: Implement Symbol intrinsic and basic functionality

src/ic-inl.h

 // 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 89 matching lines @@
   PostPatching(address, target, old_target);
 }
 
 
 InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object,
                                                 JSObject* holder) {
   if (object->IsJSObject()) {
     return GetCodeCacheForObject(JSObject::cast(object), holder);
   }
   // If the object is a value, we use the prototype map for the cache.
-  ASSERT(object->IsString() || object->IsNumber() || object->IsBoolean());
-  return PROTOTYPE_MAP;
+  ASSERT(object->IsString() || object->IsSymbol() ||
+         object->IsNumber() || object->IsBoolean());
+  return DELEGATE_MAP;
 }
 
 
 InlineCacheHolderFlag IC::GetCodeCacheForObject(JSObject* object,
                                                 JSObject* holder) {
   // Fast-properties and global objects store stubs in their own maps.
   // Slow properties objects use prototype's map (unless the property is its own
   // when holder == object). It works because slow properties objects having
   // the same prototype (or a prototype with the same map) and not having
   // the property are interchangeable for such a stub.
   if (holder != object &&
       !object->HasFastProperties() &&
       !object->IsJSGlobalProxy() &&
       !object->IsJSGlobalObject()) {
-    return PROTOTYPE_MAP;
+    return DELEGATE_MAP;
   }
   return OWN_MAP;
 }
 
 
 JSObject* IC::GetCodeCacheHolder(Object* object, InlineCacheHolderFlag holder) {
-  Object* map_owner = (holder == OWN_MAP ? object : object->GetPrototype());
+  Object* map_owner = (holder == OWN_MAP ? object : object->GetDelegate());
   ASSERT(map_owner->IsJSObject());
   return JSObject::cast(map_owner);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IC_INL_H_