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diff --git a/Source/JavaScriptCore/dfg/DFGCFG.h b/Source/JavaScriptCore/dfg/DFGCFG.h
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+/*
+ * Copyright (C) 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 "DFGBasicBlock.h"
+#include "DFGBlockMapInlines.h"
+#include "DFGBlockSet.h"
+#include "DFGGraph.h"
+
+namespace JSC { namespace DFG {
+
+class CFG {
+    WTF_MAKE_NONCOPYABLE(CFG);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    typedef BasicBlock* Node;
+    typedef BlockSet Set;
+    template<typename T> using Map = BlockMap<T>;
+    typedef BlockList List;
+
+    CFG(Graph& graph)
+        : m_graph(graph)
+    {
+    }
+
+    Node root() { return m_graph.block(0); }
+
+    template<typename T>
+    Map<T> newMap() { return BlockMap<T>(m_graph); }
+
+    DFG::Node::SuccessorsIterable successors(Node node) { return node->successors(); }
+    PredecessorList& predecessors(Node node) { return node->predecessors; }
+
+    unsigned index(Node node) const { return node->index; }
+    Node node(unsigned index) const { return m_graph.block(index); }
+    unsigned numNodes() const { return m_graph.numBlocks(); }
+
+    PointerDump<BasicBlock> dump(Node node) const { return pointerDump(node); }
+
+    void dump(PrintStream& out) const
+    {
+        m_graph.dump(out);
+    }
+
+private:
+    Graph& m_graph;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)