Optimize Object.seal and Object.preventExtensions

src/transitions-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TRANSITIONS_INL_H_
 #define V8_TRANSITIONS_INL_H_
 
 #include "src/transitions.h"
 
 namespace v8 {
@@ skipping 139 matching lines @@
     return kNotFound;
   }
   return internal::Search<ALL_ENTRIES>(this, name, 0, out_insertion_index);
 }
 
 
 #ifdef DEBUG
 bool TransitionArray::IsSpecialTransition(Name* name) {
   if (!name->IsSymbol()) return false;
   Heap* heap = name->GetHeap();
-  return name == heap->frozen_symbol() ||
+  return name == heap->nonextensible_symbol() ||
+         name == heap->sealed_symbol() || name == heap->frozen_symbol() ||
          name == heap->elements_transition_symbol() ||
          name == heap->observed_symbol();
 }
 #endif
 
 
 int TransitionArray::CompareKeys(Name* key1, uint32_t hash1,
                                  bool is_data_property1,
                                  PropertyAttributes attributes1, Name* key2,
                                  uint32_t hash2, bool is_data_property2,
@@ skipping 67 matching lines @@
 
 
 #undef FIELD_ADDR
 #undef WRITE_FIELD
 #undef CONDITIONAL_WRITE_BARRIER
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TRANSITIONS_INL_H_