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diff --git a/Source/JavaScriptCore/runtime/ConservativeSet.h b/Source/JavaScriptCore/runtime/ConservativeSet.h
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+++ b/Source/JavaScriptCore/runtime/ConservativeSet.h
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+/*
+ * Copyright (C) 2009 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 ConservativeSet_h
+#define ConservativeSet_h
+
+#include "Heap.h"
+#include "MarkStack.h"
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class JSCell;
+
+class ConservativeSet {
+public:
+    ConservativeSet(Heap*);
+    ~ConservativeSet();
+
+    void add(void* begin, void* end);
+    void mark(MarkStack&);
+
+private:
+    static const size_t inlineCapacity = 128;
+    static const size_t nonInlineCapacity = 8192 / sizeof(JSCell*);
+    
+    void grow();
+
+    Heap* m_heap;
+    DeprecatedPtr<JSCell>* m_set;
+    size_t m_size;
+    size_t m_capacity;
+    DeprecatedPtr<JSCell> m_inlineSet[inlineCapacity];
+};
+
+inline ConservativeSet::ConservativeSet(Heap* heap)
+    : m_heap(heap)
+    , m_set(m_inlineSet)
+    , m_size(0)
+    , m_capacity(inlineCapacity)
+{
+}
+
+inline ConservativeSet::~ConservativeSet()
+{
+    if (m_set != m_inlineSet)
+        OSAllocator::decommitAndRelease(m_set, m_capacity * sizeof(DeprecatedPtr<JSCell>*));
+}
+
+inline void ConservativeSet::mark(MarkStack& markStack)
+{
+    for (size_t i = 0; i < m_size; ++i)
+        markStack.append(&m_set[i]);
+}
+
+} // namespace JSC
+
+#endif // ConservativeSet_h