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diff --git a/Source/JavaScriptCore/heap/WeakSet.h b/Source/JavaScriptCore/heap/WeakSet.h
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+++ b/Source/JavaScriptCore/heap/WeakSet.h
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+/*
+ * Copyright (C) 2012 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 WeakSet_h
+#define WeakSet_h
+
+#include "WeakBlock.h"
+
+namespace JSC {
+
+class Heap;
+class WeakImpl;
+
+class WeakSet {
+public:
+    WeakSet(Heap*);
+    void finalizeAll();
+    ~WeakSet();
+
+    static WeakImpl* allocate(JSValue, WeakHandleOwner* = 0, void* context = 0);
+    static void deallocate(WeakImpl*);
+
+    void visitLiveWeakImpls(HeapRootVisitor&);
+    void visitDeadWeakImpls(HeapRootVisitor&);
+
+    void sweep();
+    void resetAllocator();
+
+    void shrink();
+
+private:
+    JS_EXPORT_PRIVATE WeakBlock::FreeCell* findAllocator();
+    WeakBlock::FreeCell* tryFindAllocator();
+    WeakBlock::FreeCell* addAllocator();
+    void removeAllocator(WeakBlock*);
+
+    WeakBlock::FreeCell* m_allocator;
+    WeakBlock* m_nextAllocator;
+    DoublyLinkedList<WeakBlock> m_blocks;
+    Heap* m_heap;
+};
+
+inline WeakSet::WeakSet(Heap* heap)
+    : m_allocator(0)
+    , m_nextAllocator(0)
+    , m_heap(heap)
+{
+}
+
+inline void WeakSet::deallocate(WeakImpl* weakImpl)
+{
+    weakImpl->setState(WeakImpl::Deallocated);
+}
+
+} // namespace JSC
+
+#endif // WeakSet_h