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diff --git a/Source/JavaScriptCore/jit/RegisterAtOffsetList.cpp b/Source/JavaScriptCore/jit/RegisterAtOffsetList.cpp
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+++ b/Source/JavaScriptCore/jit/RegisterAtOffsetList.cpp
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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. 
+ */
+
+#include "config.h"
+#include "RegisterAtOffsetList.h"
+
+#if ENABLE(JIT)
+
+#include <wtf/ListDump.h>
+
+namespace JSC {
+    
+RegisterAtOffsetList::RegisterAtOffsetList() { }
+
+RegisterAtOffsetList::RegisterAtOffsetList(RegisterSet registerSet, OffsetBaseType offsetBaseType)
+{
+    size_t numberOfRegisters = registerSet.numberOfSetRegisters();
+    ptrdiff_t offset = 0;
+    
+    if (offsetBaseType == FramePointerBased)
+        offset = -(static_cast<ptrdiff_t>(numberOfRegisters) * sizeof(void*));
+
+    m_registers.reserveInitialCapacity(numberOfRegisters);
+    registerSet.forEach([&] (Reg reg) {
+        m_registers.append(RegisterAtOffset(reg, offset));
+        offset += sizeof(void*);
+    });
+}
+
+void RegisterAtOffsetList::dump(PrintStream& out) const
+{
+    out.print(listDump(m_registers));
+}
+
+RegisterAtOffset* RegisterAtOffsetList::find(Reg reg) const
+{
+    return tryBinarySearch<RegisterAtOffset, Reg>(m_registers, m_registers.size(), reg, RegisterAtOffset::getReg);
+}
+
+unsigned RegisterAtOffsetList::indexOf(Reg reg) const
+{
+    if (RegisterAtOffset* pointer = find(reg))
+        return pointer - m_registers.begin();
+    return UINT_MAX;
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)
+