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diff --git a/Source/JavaScriptCore/runtime/IntendedStructureChain.h b/Source/JavaScriptCore/runtime/IntendedStructureChain.h
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+++ b/Source/JavaScriptCore/runtime/IntendedStructureChain.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 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 IntendedStructureChain_h
+#define IntendedStructureChain_h
+
+#include "Structure.h"
+#include <wtf/RefCounted.h>
+
+namespace JSC {
+
+class CodeBlock;
+class JSGlobalObject;
+class StructureChain;
+class VM;
+
+class IntendedStructureChain : public RefCounted<IntendedStructureChain> {
+public:
+    IntendedStructureChain(JSGlobalObject* globalObject, Structure* head);
+    IntendedStructureChain(CodeBlock* codeBlock, Structure* head, Structure* prototypeStructure);
+    IntendedStructureChain(CodeBlock* codeBlock, Structure* head, StructureChain* chain);
+    IntendedStructureChain(CodeBlock* codeBlock, Structure* head, StructureChain* chain, unsigned count);
+    ~IntendedStructureChain();
+    
+    bool isStillValid() const;
+    bool matches(StructureChain*) const;
+    StructureChain* chain(VM&) const;
+    bool mayInterceptStoreTo(VM&, StringImpl* uid);
+    bool isNormalized();
+    
+    Structure* head() const { return m_head; }
+    
+    size_t size() const { return m_vector.size(); }
+    Structure* at(size_t index) { return m_vector[index]; }
+    Structure* operator[](size_t index) { return at(index); }
+    
+    JSObject* terminalPrototype() const;
+    
+    Structure* last() const { return m_vector.last(); }
+private:
+    JSGlobalObject* m_globalObject;
+    Structure* m_head;
+    Vector<Structure*> m_vector;
+};
+
+} // namespace JSC
+
+#endif // IntendedStructureChain_h