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diff --git a/Source/JavaScriptCore/jit/RegisterMap.h b/Source/JavaScriptCore/jit/RegisterMap.h
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+++ b/Source/JavaScriptCore/jit/RegisterMap.h
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+/*
+ * Copyright (C) 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 "FPRInfo.h"
+#include "GPRInfo.h"
+#include "MacroAssembler.h"
+#include "Reg.h"
+
+namespace JSC {
+
+template<typename T>
+class RegisterMap {
+public:
+    T& operator[](Reg reg)
+    {
+        return m_map[reg.index()];
+    }
+
+    T& operator[](GPRReg gpr)
+    {
+        return m_map[MacroAssembler::registerIndex(gpr)];
+    }
+
+    T& operator[](FPRReg fpr)
+    {
+        return m_map[MacroAssembler::registerIndex(fpr)];
+    }
+
+    const T& operator[](Reg reg) const
+    {
+        return m_map[reg.index()];
+    }
+
+    const T& operator[](GPRReg gpr) const
+    {
+        return m_map[MacroAssembler::registerIndex(gpr)];
+    }
+
+    const T& operator[](FPRReg fpr) const
+    {
+        return m_map[MacroAssembler::registerIndex(fpr)];
+    }
+
+private:
+    std::array<T, MacroAssembler::totalNumberOfRegisters()> m_map { { } };
+};
+
+template<typename T>
+class GPRMap {
+public:
+    T& operator[](GPRReg gpr)
+    {
+        return m_map[MacroAssembler::registerIndex(gpr)];
+    }
+
+    const T& operator[](GPRReg gpr) const
+    {
+        return m_map[MacroAssembler::registerIndex(gpr)];
+    }
+
+private:
+    std::array<T, MacroAssembler::numberOfRegisters()> m_map { { } };
+};
+
+template<typename T>
+class FPRMap {
+public:
+    T& operator[](FPRReg fpr)
+    {
+        return m_map[MacroAssembler::fpRegisterIndex(fpr)];
+    }
+
+    const T& operator[](FPRReg fpr) const
+    {
+        return m_map[MacroAssembler::fpRegisterIndex(fpr)];
+    }
+
+private:
+    std::array<T, MacroAssembler::numberOfFPRegisters()> m_map { { } };
+};
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)