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diff --git a/Source/JavaScriptCore/jit/RegisterAtOffsetList.h b/Source/JavaScriptCore/jit/RegisterAtOffsetList.h
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+/*
+ * Copyright (C) 2015-2016 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 "RegisterAtOffset.h"
+#include "RegisterSet.h"
+
+namespace JSC {
+
+class RegisterAtOffsetList {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    enum OffsetBaseType { FramePointerBased, ZeroBased };
+
+    RegisterAtOffsetList();
+    RegisterAtOffsetList(RegisterSet, OffsetBaseType = FramePointerBased);
+
+    void dump(PrintStream&) const;
+
+    void clear()
+    {
+        m_registers.clear();
+    }
+
+    size_t size() const
+    {
+        return m_registers.size();
+    }
+
+    RegisterAtOffset& at(size_t index)
+    {
+        return m_registers.at(index);
+    }
+    
+    RegisterAtOffset* find(Reg) const;
+    unsigned indexOf(Reg) const; // Returns UINT_MAX if not found.
+
+    Vector<RegisterAtOffset>::const_iterator begin() const { return m_registers.begin(); }
+    Vector<RegisterAtOffset>::const_iterator end() const { return m_registers.end(); }
+
+private:
+    Vector<RegisterAtOffset> m_registers;
+};
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)