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diff --git a/Source/JavaScriptCore/dfg/DFGAtTailAbstractState.h b/Source/JavaScriptCore/dfg/DFGAtTailAbstractState.h
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+++ b/Source/JavaScriptCore/dfg/DFGAtTailAbstractState.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. ``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
+ * 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 DFGAtTailAbstractState_h
+#define DFGAtTailAbstractState_h
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGAbstractValue.h"
+#include "DFGBasicBlock.h"
+#include "DFGGraph.h"
+
+namespace JSC { namespace DFG { 
+
+class AtTailAbstractState {
+public:
+    AtTailAbstractState(Graph&);
+    
+    ~AtTailAbstractState();
+    
+    void initializeTo(BasicBlock* block)
+    {
+        m_block = block;
+    }
+    
+    void createValueForNode(Node*);
+    AbstractValue& forNode(Node*);
+    AbstractValue& forNode(Edge edge) { return forNode(edge.node()); }
+    Operands<AbstractValue>& variables() { return m_block->valuesAtTail; }
+    
+    BasicBlock* block() const { return m_block; }
+    
+    bool isValid() { return m_block->cfaDidFinish; }
+    
+    StructureClobberState structureClobberState() const { return m_block->cfaStructureClobberStateAtTail; }
+    
+    void setDidClobber(bool) { }
+    void setStructureClobberState(StructureClobberState state) { RELEASE_ASSERT(state == m_block->cfaStructureClobberStateAtTail); }
+    void setIsValid(bool isValid) { m_block->cfaDidFinish = isValid; }
+    void setBranchDirection(BranchDirection) { }
+    void setFoundConstants(bool) { }
+
+private:
+    Graph& m_graph;
+    BasicBlock* m_block;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGAtTailAbstractState_h
+