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diff --git a/Source/JavaScriptCore/dfg/DFGEdgeDominates.h b/Source/JavaScriptCore/dfg/DFGEdgeDominates.h
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+++ b/Source/JavaScriptCore/dfg/DFGEdgeDominates.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 DFGEdgeDominates_h
+#define DFGEdgeDominates_h
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGDominators.h"
+#include "DFGGraph.h"
+
+namespace JSC { namespace DFG {
+
+class EdgeDominates {
+    static const bool verbose = false;
+    
+public:
+    EdgeDominates(Graph& graph, BasicBlock* block)
+        : m_graph(graph)
+        , m_block(block)
+        , m_result(true)
+    {
+    }
+    
+    void operator()(Node*, Edge edge)
+    {
+        bool result = m_graph.m_dominators->dominates(edge.node()->owner, m_block);
+        if (verbose) {
+            dataLog(
+                "Checking if ", edge, " in ", *edge.node()->owner,
+                " dominates ", *m_block, ": ", result, "\n");
+        }
+        m_result &= result;
+    }
+    
+    bool result() const { return m_result; }
+
+private:
+    Graph& m_graph;
+    BasicBlock* m_block;
+    bool m_result;
+};
+
+inline bool edgesDominate(Graph& graph, Node* node, BasicBlock* block)
+{
+    EdgeDominates edgeDominates(graph, block);
+    DFG_NODE_DO_TO_CHILDREN(graph, node, edgeDominates);
+    return edgeDominates.result();
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGEdgeDominates_h
+