ES6 symbols: Implement Symbol intrinsic and basic functionality

src/objects-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 163 matching lines @@
 bool Object::NonFailureIsHeapObject() {
   ASSERT(!this->IsFailure());
   return (reinterpret_cast<intptr_t>(this) & kSmiTagMask) != 0;
 }
 
 
 TYPE_CHECKER(HeapNumber, HEAP_NUMBER_TYPE)
 TYPE_CHECKER(Symbol, SYMBOL_TYPE)
 
 
-bool Object::IsName() {
-  return Object::IsHeapObject()
-    && HeapObject::cast(this)->map()->instance_type() <= LAST_NAME_TYPE;
-}
-
-
 bool Object::IsString() {
   return Object::IsHeapObject()
     && HeapObject::cast(this)->map()->instance_type() < FIRST_NONSTRING_TYPE;
 }
 
 
+bool Object::IsName() {
+  return IsString() || IsSymbol();
+}
+
+
+bool Object::IsUniqueName() {
+  return IsInternalizedString() || IsSymbol();
+}
+
+
 bool Object::IsSpecObject() {
   return Object::IsHeapObject()
     && HeapObject::cast(this)->map()->instance_type() >= FIRST_SPEC_OBJECT_TYPE;
 }
 
 
 bool Object::IsSpecFunction() {
   if (!Object::IsHeapObject()) return false;
   InstanceType type = HeapObject::cast(this)->map()->instance_type();
   return type == JS_FUNCTION_TYPE || type == JS_FUNCTION_PROXY_TYPE;
@@ skipping 5694 matching lines @@
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_