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diff --git a/Source/JavaScriptCore/dfg/DFGOSRAvailabilityAnalysisPhase.h b/Source/JavaScriptCore/dfg/DFGOSRAvailabilityAnalysisPhase.h
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+/*
+ * Copyright (C) 2013, 2014 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 DFGOSRAvailabilityAnalysisPhase_h
+#define DFGOSRAvailabilityAnalysisPhase_h
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGBasicBlock.h"
+#include "DFGCommon.h"
+
+namespace JSC { namespace DFG {
+
+class Graph;
+
+// Computes BasicBlock::ssa->availabiltiyAtHead/Tail. This is a forward flow type inference
+// over MovHints and SetLocals. This analysis is run directly by the Plan for preparing for
+// lowering to B3 IR, but it can also be used as a utility. Note that if you run it before
+// stack layout, all of the flush availability will omit the virtual register - but it will
+// tell you the format.
+
+bool performOSRAvailabilityAnalysis(Graph&);
+
+// Local calculator for figuring out the availability at any node in a basic block. Requires
+// having run the availability analysis.
+class LocalOSRAvailabilityCalculator {
+public:
+    LocalOSRAvailabilityCalculator();
+    ~LocalOSRAvailabilityCalculator();
+    
+    void beginBlock(BasicBlock*);
+    void endBlock(BasicBlock*); // Useful if you want to get data for the end of the block. You don't need to call this if you did beginBlock() and then executeNode() for every node.
+    void executeNode(Node*);
+    
+    AvailabilityMap m_availability;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGOSRAvailabilityAnalysisPhase_h
+