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diff --git a/Source/JavaScriptCore/runtime/StructureRareData.h b/Source/JavaScriptCore/runtime/StructureRareData.h
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+/*
+ * Copyright (C) 2013 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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 StructureRareData_h
+#define StructureRareData_h
+
+#include "ClassInfo.h"
+#include "JSCell.h"
+#include "JSTypeInfo.h"
+
+namespace JSC {
+
+class JSPropertyNameIterator;
+class Structure;
+
+class StructureRareData : public JSCell {
+    friend class Structure;
+public:
+    static StructureRareData* create(VM&, Structure*);
+    static StructureRareData* clone(VM&, const StructureRareData* other);
+
+    static void visitChildren(JSCell*, SlotVisitor&);
+
+    static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
+
+    // Returns true if this StructureRareData should also be cloned when cloning the owner Structure.
+    bool needsCloning() const { return false; }
+
+    Structure* previousID() const;
+    void setPreviousID(VM&, Structure* transition, Structure*);
+    void clearPreviousID();
+
+    JSString* objectToStringValue() const;
+    void setObjectToStringValue(VM&, const JSCell* owner, JSString* value);
+
+    JSPropertyNameIterator* enumerationCache();
+    void setEnumerationCache(VM&, const Structure* owner, JSPropertyNameIterator* value);
+
+    static JS_EXPORTDATA const ClassInfo s_info;
+
+private:
+    StructureRareData(VM&, Structure*);
+    StructureRareData(VM&, const StructureRareData*);
+
+    static const unsigned StructureFlags = OverridesVisitChildren | JSCell::StructureFlags;
+
+    WriteBarrier<Structure> m_previous;
+    WriteBarrier<JSString> m_objectToStringValue;
+    WriteBarrier<JSPropertyNameIterator> m_enumerationCache;
+};
+
+} // namespace JSC
+
+#endif // StructureRareData_h