Make Object.freeze fast

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 3574 matching lines @@
   set_bit_field3(Deprecated::update(bit_field3(), true));
 }
 
 
 bool Map::is_deprecated() {
   if (!FLAG_track_fields) return false;
   return Deprecated::decode(bit_field3());
 }
 
 
+void Map::freeze() {
+  set_bit_field3(IsFrozen::update(bit_field3(), true));
+}
+
+
+bool Map::is_frozen() {
+  return IsFrozen::decode(bit_field3());
+}
+
+
 bool Map::CanBeDeprecated() {
   int descriptor = LastAdded();
   for (int i = 0; i <= descriptor; i++) {
     PropertyDetails details = instance_descriptors()->GetDetails(i);
     if (FLAG_track_fields && details.representation().IsSmi()) {
       return true;
     }
     if (FLAG_track_double_fields && details.representation().IsDouble()) {
       return true;
     }
@@ skipping 2597 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_