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diff --git a/Source/JavaScriptCore/dfg/DFGPhase.h b/Source/JavaScriptCore/dfg/DFGPhase.h
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+/*
+ * Copyright (C) 2011 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 DFGPhase_h
+#define DFGPhase_h
+
+#include <wtf/Platform.h>
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGCommon.h"
+#include "DFGGraph.h"
+
+namespace JSC { namespace DFG {
+
+class Phase {
+public:
+    Phase(Graph& graph, const char* name)
+        : m_graph(graph)
+        , m_name(name)
+    {
+        beginPhase();
+    }
+    
+    ~Phase()
+    {
+        endPhase();
+    }
+    
+    // Each phase must have a run() method.
+    
+protected:
+    // Things you need to have a DFG compiler phase.
+    Graph& m_graph;
+    
+    JSGlobalData& globalData() { return m_graph.m_globalData; }
+    CodeBlock* codeBlock() { return m_graph.m_codeBlock; }
+    CodeBlock* profiledBlock() { return m_graph.m_profiledBlock; }
+    
+    const char* m_name;
+    
+private:
+    // Call these hooks when starting and finishing.
+#if DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
+    void beginPhase();
+    void endPhase();
+#else // DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
+    void beginPhase() { }
+    void endPhase() { }
+#endif // DFG_ENABLE(DEBUG_PROPAGATION_VERBOSE)
+};
+
+template<typename PhaseType>
+void runPhase(Graph& graph)
+{
+    PhaseType phase(graph);
+    phase.run();
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGPhase_h
+