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diff --git a/Source/JavaScriptCore/bytecompiler/RegisterID.h b/Source/JavaScriptCore/bytecompiler/RegisterID.h
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+++ b/Source/JavaScriptCore/bytecompiler/RegisterID.h
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+/*
+ * Copyright (C) 2008 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 RegisterID_h
+#define RegisterID_h
+
+#include <wtf/Assertions.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/VectorTraits.h>
+
+namespace JSC {
+
+    class RegisterID : public Noncopyable {
+    public:
+        RegisterID()
+            : m_refCount(0)
+            , m_isTemporary(false)
+#ifndef NDEBUG
+            , m_didSetIndex(false)
+#endif
+        {
+        }
+
+        explicit RegisterID(int index)
+            : m_refCount(0)
+            , m_index(index)
+            , m_isTemporary(false)
+#ifndef NDEBUG
+            , m_didSetIndex(true)
+#endif
+        {
+        }
+
+        void setIndex(int index)
+        {
+            ASSERT(!m_refCount);
+#ifndef NDEBUG
+            m_didSetIndex = true;
+#endif
+            m_index = index;
+        }
+
+        void setTemporary()
+        {
+            m_isTemporary = true;
+        }
+
+        int index() const
+        {
+            ASSERT(m_didSetIndex);
+            return m_index;
+        }
+
+        bool isTemporary()
+        {
+            return m_isTemporary;
+        }
+
+        void ref()
+        {
+            ++m_refCount;
+        }
+
+        void deref()
+        {
+            --m_refCount;
+            ASSERT(m_refCount >= 0);
+        }
+
+        int refCount() const
+        {
+            return m_refCount;
+        }
+
+    private:
+
+        int m_refCount;
+        int m_index;
+        bool m_isTemporary;
+#ifndef NDEBUG
+        bool m_didSetIndex;
+#endif
+    };
+
+} // namespace JSC
+
+namespace WTF {
+
+    template<> struct VectorTraits<JSC::RegisterID> : VectorTraitsBase<true, JSC::RegisterID> {
+        static const bool needsInitialization = true;
+        static const bool canInitializeWithMemset = true; // Default initialization just sets everything to 0 or false, so this is safe.
+    };
+
+} // namespace WTF
+
+#endif // RegisterID_h