Internalize strings being stored into uninitialized property cells

src/lookup.h

 // Copyright 2014 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_LOOKUP_H_
 #define V8_LOOKUP_H_
 
 #include "src/factory.h"
 #include "src/isolate.h"
 #include "src/objects.h"
@@ skipping 118 matching lines @@
   bool IsReadOnly() const { return property_details().IsReadOnly(); }
   Representation representation() const {
     return property_details().representation();
   }
   FieldIndex GetFieldIndex() const;
   Handle<HeapType> GetFieldType() const;
   int GetConstantIndex() const;
   Handle<PropertyCell> GetPropertyCell() const;
   Handle<Object> GetAccessors() const;
   Handle<Object> GetDataValue() const;
-  void WriteDataValue(Handle<Object> value);
+  // Usually returns the value that was passed in, but may perform
+  // non-observable modifications on it, such as internalize strings.
+  Handle<Object> WriteDataValue(Handle<Object> value);
 
   // Checks whether the receiver is an indexed exotic object
   // and name is a special numeric index.
   bool IsSpecialNumericIndex() const;
 
   void InternalizeName();
 
  private:
   Handle<Map> GetReceiverMap() const;
 
@@ skipping 44 matching lines @@
   Handle<Object> receiver_;
   Handle<JSReceiver> holder_;
 
   int number_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOOKUP_H_