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diff --git a/Source/JavaScriptCore/dfg/DFGDesiredWeakReferences.h b/Source/JavaScriptCore/dfg/DFGDesiredWeakReferences.h
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+/*
+ * Copyright (C) 2013-2015 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. AND ITS CONTRIBUTORS ``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 ITS 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 DFGDesiredWeakReferences_h
+#define DFGDesiredWeakReferences_h
+
+#include <wtf/HashSet.h>
+
+#if ENABLE(DFG_JIT)
+
+namespace JSC { 
+
+class CodeBlock;
+class JSCell;
+class JSValue;
+class SlotVisitor;
+class VM;
+
+namespace DFG {
+
+class CommonData;
+
+class DesiredWeakReferences {
+public:
+    DesiredWeakReferences();
+    DesiredWeakReferences(CodeBlock*);
+    ~DesiredWeakReferences();
+
+    void addLazily(JSCell*);
+    void addLazily(JSValue);
+    bool contains(JSCell*);
+    
+    void reallyAdd(VM&, CommonData*);
+    
+    void visitChildren(SlotVisitor&);
+
+private:
+    CodeBlock* m_codeBlock;
+    HashSet<JSCell*> m_references;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGDesiredWeakReferences_h