Handlify Map::CopyDropDescriptors().

test/cctest/test-alloc.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 119 matching lines @@
   function->ReplaceCode(CcTest::i_isolate()->builtins()->builtin(
       Builtins::kEmptyFunction));
   // Patch the map to have an accessor for "get".
   Handle<Map> map(function->initial_map());
   Handle<DescriptorArray> instance_descriptors(map->instance_descriptors());
   Handle<Foreign> foreign = factory->NewForeign(&kDescriptor);
   Handle<String> name =
       factory->NewStringFromAscii(Vector<const char>("get", 3));
   ASSERT(instance_descriptors->IsEmpty());
 
-  Handle<DescriptorArray> new_descriptors = factory->NewDescriptorArray(0, 1);
-
-  v8::internal::DescriptorArray::WhitenessWitness witness(*new_descriptors);
-  map->set_instance_descriptors(*new_descriptors);
+  Map::EnsureDescriptorSlack(map, 1);
 
   CallbacksDescriptor d(name,
                         foreign,
                         static_cast<PropertyAttributes>(0));
-  map->AppendDescriptor(&d, witness);
+  map->AppendDescriptor(&d);
 
   // Add the Foo constructor the global object.
   env->Global()->Set(v8::String::NewFromUtf8(CcTest::isolate(), "Foo"),
                      v8::Utils::ToLocal(function));
   // Call the accessor through JavaScript.
   v8::Handle<v8::Value> result = v8::Script::Compile(
       v8::String::NewFromUtf8(CcTest::isolate(), "(new Foo).get"))->Run();
   CHECK_EQ(42, result->Int32Value());
   env->Exit();
 }
@@ skipping 61 matching lines @@
       if (index < blocks.length() - 1) {
         blocks[index] = blocks.RemoveLast();
       } else {
         blocks.RemoveLast();
       }
     }
   }
 
   code_range.TearDown();
 }