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diff --git a/Source/JavaScriptCore/dfg/DFGMinifiedID.h b/Source/JavaScriptCore/dfg/DFGMinifiedID.h
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+++ b/Source/JavaScriptCore/dfg/DFGMinifiedID.h
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+/*
+ * Copyright (C) 2013 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. 
+ */
+
+#ifndef DFGMinifiedID_h
+#define DFGMinifiedID_h
+
+#include <wtf/Platform.h>
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGCommon.h"
+#include <wtf/HashMap.h>
+#include <wtf/PrintStream.h>
+
+namespace JSC { namespace DFG {
+
+class Graph;
+class MinifiedNode;
+class ValueSource;
+
+class MinifiedID {
+public:
+    MinifiedID() : m_id(invalidID()) { }
+    MinifiedID(WTF::HashTableDeletedValueType) : m_id(otherInvalidID()) { }
+    explicit MinifiedID(Node* node) : m_id(bitwise_cast<uintptr_t>(node)) { }
+    
+    bool operator!() const { return m_id == invalidID(); }
+    
+    // This takes Graph& to remind you, that you should only be calling this method
+    // when you're in the main compilation pass (i.e. you have a graph) and not later,
+    // like during OSR exit compilation.
+    Node* node(const Graph&) const { return bitwise_cast<Node*>(m_id); }
+    
+    bool operator==(const MinifiedID& other) const { return m_id == other.m_id; }
+    bool operator!=(const MinifiedID& other) const { return m_id != other.m_id; }
+    bool operator<(const MinifiedID& other) const { return m_id < other.m_id; }
+    bool operator>(const MinifiedID& other) const { return m_id > other.m_id; }
+    bool operator<=(const MinifiedID& other) const { return m_id <= other.m_id; }
+    bool operator>=(const MinifiedID& other) const { return m_id >= other.m_id; }
+    
+    unsigned hash() const { return WTF::IntHash<uintptr_t>::hash(m_id); }
+    
+    void dump(PrintStream& out) const { out.print(RawPointer(reinterpret_cast<void*>(m_id))); }
+    
+    bool isHashTableDeletedValue() const { return m_id == otherInvalidID(); }
+    
+private:
+    friend class MinifiedNode;
+    friend class ValueSource;
+    
+    static uintptr_t invalidID() { return static_cast<uintptr_t>(static_cast<intptr_t>(-1)); }
+    static uintptr_t otherInvalidID() { return static_cast<uintptr_t>(static_cast<intptr_t>(-2)); }
+    
+    static MinifiedID fromBits(uintptr_t value)
+    {
+        MinifiedID result;
+        result.m_id = value;
+        return result;
+    }
+
+    uintptr_t m_id;
+};
+
+struct MinifiedIDHash {
+    static unsigned hash(const MinifiedID& key) { return key.hash(); }
+    static bool equal(const MinifiedID& a, const MinifiedID& b) { return a == b; }
+    static const bool safeToCompareToEmptyOrDeleted = true;
+};
+
+} } // namespace JSC::DFG
+
+namespace WTF {
+
+template<typename T> struct DefaultHash;
+template<> struct DefaultHash<JSC::DFG::MinifiedID> {
+    typedef JSC::DFG::MinifiedIDHash Hash;
+};
+
+template<typename T> struct HashTraits;
+template<> struct HashTraits<JSC::DFG::MinifiedID> : SimpleClassHashTraits<JSC::DFG::MinifiedID> { };
+
+} // namespace WTF
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGMinifiedID_h
+