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diff --git a/Source/JavaScriptCore/dfg/DFGAvailabilityMap.h b/Source/JavaScriptCore/dfg/DFGAvailabilityMap.h
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+++ b/Source/JavaScriptCore/dfg/DFGAvailabilityMap.h
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+/*
+ * Copyright (C) 2014, 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(DFG_JIT)
+
+#include "DFGAvailability.h"
+#include "DFGPromotedHeapLocation.h"
+
+namespace JSC { namespace DFG {
+
+struct AvailabilityMap {
+    void pruneHeap();
+    void pruneByLiveness(Graph&, CodeOrigin);
+    void clear();
+    
+    void dump(PrintStream& out) const;
+    
+    bool operator==(const AvailabilityMap& other) const;
+    
+    void merge(const AvailabilityMap& other);
+    
+    template<typename Functor>
+    void forEachAvailability(const Functor& functor)
+    {
+        for (unsigned i = m_locals.size(); i--;)
+            functor(m_locals[i]);
+        for (auto pair : m_heap)
+            functor(pair.value);
+    }
+    
+    template<typename HasFunctor, typename AddFunctor>
+    void closeOverNodes(const HasFunctor& has, const AddFunctor& add)
+    {
+        bool changed;
+        do {
+            changed = false;
+            for (auto pair : m_heap) {
+                if (pair.value.hasNode() && has(pair.key.base()))
+                    changed |= add(pair.value.node());
+            }
+        } while (changed);
+    }
+    
+    template<typename HasFunctor, typename AddFunctor>
+    void closeStartingWithLocal(VirtualRegister reg, const HasFunctor& has, const AddFunctor& add)
+    {
+        Availability availability = m_locals.operand(reg);
+        if (!availability.hasNode())
+            return;
+        
+        if (!add(availability.node()))
+            return;
+        
+        closeOverNodes(has, add);
+    }
+    
+    Operands<Availability> m_locals;
+    HashMap<PromotedHeapLocation, Availability> m_heap;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)