diff -r 000000000000 -r 4f2f89ce4247 JavaScriptCore/runtime/BatchedTransitionOptimizer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/runtime/BatchedTransitionOptimizer.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,55 @@
+// -*- mode: c++; c-basic-offset: 4 -*-
+/*
+ * Copyright (C) 2008 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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 with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#ifndef BatchedTransitionOptimizer_h
+#define BatchedTransitionOptimizer_h
+
+#include <wtf/Noncopyable.h>
+#include "JSObject.h"
+
+namespace JSC {
+
+    class BatchedTransitionOptimizer : public Noncopyable {
+    public:
+        BatchedTransitionOptimizer(JSObject* object)
+            : m_object(object)
+        {
+            if (!m_object->structure()->isDictionary())
+                m_object->setStructure(Structure::toCacheableDictionaryTransition(m_object->structure()));
+        }
+
+        ~BatchedTransitionOptimizer()
+        {
+            m_object->flattenDictionaryObject();
+        }
+
+    private:
+        JSObject* m_object;
+    };
+
+} // namespace JSC
+
+#endif // BatchedTransitionOptimizer_h