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diff --git a/Source/JavaScriptCore/jit/RegisterAtOffset.h b/Source/JavaScriptCore/jit/RegisterAtOffset.h
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+++ b/Source/JavaScriptCore/jit/RegisterAtOffset.h
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+/*
+ * Copyright (C) 2013-2015 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. 
+ */
+
+#pragma once
+
+#if ENABLE(JIT)
+
+#include "Reg.h"
+#include <wtf/PrintStream.h>
+
+namespace JSC {
+
+class RegisterAtOffset {
+public:
+    RegisterAtOffset()
+        : m_offset(0)
+    {
+    }
+    
+    RegisterAtOffset(Reg reg, ptrdiff_t offset)
+        : m_reg(reg)
+        , m_offset(offset)
+    {
+    }
+    
+    bool operator!() const { return !m_reg; }
+    
+    Reg reg() const { return m_reg; }
+    ptrdiff_t offset() const { return m_offset; }
+    int offsetAsIndex() const { return offset() / sizeof(void*); }
+    
+    bool operator==(const RegisterAtOffset& other) const
+    {
+        return reg() == other.reg() && offset() == other.offset();
+    }
+    
+    bool operator<(const RegisterAtOffset& other) const
+    {
+        if (reg() != other.reg())
+            return reg() < other.reg();
+        return offset() < other.offset();
+    }
+    
+    static Reg getReg(RegisterAtOffset* value) { return value->reg(); }
+    
+    void dump(PrintStream& out) const;
+
+private:
+    Reg m_reg;
+    ptrdiff_t m_offset : sizeof(ptrdiff_t) * 8 - sizeof(Reg) * 8;
+};
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)