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diff --git a/Source/JavaScriptCore/runtime/StructureChain.h b/Source/JavaScriptCore/runtime/StructureChain.h
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+/*
+ * 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 StructureChain_h
+#define StructureChain_h
+
+#include "JSCell.h"
+#include "JSObject.h"
+#include "Structure.h"
+
+#include <wtf/OwnArrayPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+
+namespace JSC {
+
+    class Structure;
+
+    class StructureChain : public JSCell {
+        friend class JIT;
+
+    public:
+        typedef JSCell Base;
+
+        static StructureChain* create(JSGlobalData& globalData, Structure* head)
+        { 
+            StructureChain* chain = new (NotNull, allocateCell<StructureChain>(globalData.heap)) StructureChain(globalData, globalData.structureChainStructure.get());
+            chain->finishCreation(globalData, head);
+            return chain;
+        }
+        WriteBarrier<Structure>* head() { return m_vector.get(); }
+        static void visitChildren(JSCell*, SlotVisitor&);
+
+        static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype) { return Structure::create(globalData, globalObject, prototype, TypeInfo(CompoundType, OverridesVisitChildren), &s_info); }
+        
+        static ClassInfo s_info;
+
+    protected:
+        void finishCreation(JSGlobalData& globalData, Structure* head)
+        {
+            Base::finishCreation(globalData);
+            size_t size = 0;
+            for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
+                ++size;
+    
+            m_vector = adoptArrayPtr(new WriteBarrier<Structure>[size + 1]);
+
+            size_t i = 0;
+            for (Structure* current = head; current; current = current->storedPrototype().isNull() ? 0 : asObject(current->storedPrototype())->structure())
+                m_vector[i++].set(globalData, this, current);
+        }
+
+    private:
+        StructureChain(JSGlobalData&, Structure*);
+        static void destroy(JSCell*);
+        OwnArrayPtr<WriteBarrier<Structure> > m_vector;
+    };
+
+} // namespace JSC
+
+#endif // StructureChain_h