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diff --git a/Source/JavaScriptCore/dfg/DFGThreadData.h b/Source/JavaScriptCore/dfg/DFGThreadData.h
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+++ b/Source/JavaScriptCore/dfg/DFGThreadData.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. 
+ */
+
+#ifndef DFGThreadData_h
+#define DFGThreadData_h
+
+#if ENABLE(DFG_JIT)
+
+#include <wtf/Lock.h>
+#include <wtf/Threading.h>
+
+namespace JSC { namespace DFG {
+
+class Safepoint;
+class Worklist;
+
+class ThreadData {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    ThreadData(Worklist*);
+    ~ThreadData();
+    
+private:
+    friend class Safepoint;
+    friend class Worklist;
+    
+    Worklist* m_worklist;
+    ThreadIdentifier m_identifier;
+    Lock m_rightToRun;
+    Safepoint* m_safepoint;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGThreadData_h
+