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diff --git a/Source/JavaScriptCore/heap/DeferGC.h b/Source/JavaScriptCore/heap/DeferGC.h
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+++ b/Source/JavaScriptCore/heap/DeferGC.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 DeferGC_h
+#define DeferGC_h
+
+#include "Heap.h"
+#include <wtf/Noncopyable.h>
+#include <wtf/ThreadSpecific.h>
+
+namespace JSC {
+
+class DeferGC {
+    WTF_MAKE_NONCOPYABLE(DeferGC);
+public:
+    DeferGC(Heap& heap)
+        : m_heap(heap)
+    {
+        m_heap.incrementDeferralDepth();
+    }
+    
+    ~DeferGC()
+    {
+        m_heap.decrementDeferralDepthAndGCIfNeeded();
+    }
+
+private:
+    Heap& m_heap;
+};
+
+class DeferGCForAWhile {
+    WTF_MAKE_NONCOPYABLE(DeferGCForAWhile);
+public:
+    DeferGCForAWhile(Heap& heap)
+        : m_heap(heap)
+    {
+        m_heap.incrementDeferralDepth();
+    }
+    
+    ~DeferGCForAWhile()
+    {
+        m_heap.decrementDeferralDepth();
+    }
+
+private:
+    Heap& m_heap;
+};
+
+#ifndef NDEBUG
+class DisallowGC {
+    WTF_MAKE_NONCOPYABLE(DisallowGC);
+public:
+    DisallowGC()
+    {
+        WTF::threadSpecificSet(s_isGCDisallowedOnCurrentThread, reinterpret_cast<void*>(true));
+    }
+
+    ~DisallowGC()
+    {
+        WTF::threadSpecificSet(s_isGCDisallowedOnCurrentThread, reinterpret_cast<void*>(false));
+    }
+
+    static bool isGCDisallowedOnCurrentThread()
+    {
+        return !!WTF::threadSpecificGet(s_isGCDisallowedOnCurrentThread);
+    }
+    static void initialize()
+    {
+        WTF::threadSpecificKeyCreate(&s_isGCDisallowedOnCurrentThread, 0);
+    }
+
+    JS_EXPORT_PRIVATE static WTF::ThreadSpecificKey s_isGCDisallowedOnCurrentThread;
+};
+#endif // NDEBUG
+
+} // namespace JSC
+
+#endif // DeferGC_h
+