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diff --git a/Source/JavaScriptCore/heap/ConservativeRoots.h b/Source/JavaScriptCore/heap/ConservativeRoots.h
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+++ b/Source/JavaScriptCore/heap/ConservativeRoots.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 ConservativeRoots_h
+#define ConservativeRoots_h
+
+#include "Heap.h"
+#include <wtf/OSAllocator.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class JSCell;
+class Heap;
+
+// May contain duplicates.
+
+class ConservativeRoots {
+public:
+    ConservativeRoots(Heap*);
+    ~ConservativeRoots();
+
+    void add(void*);
+    void add(void* begin, void* end);
+    
+    size_t size();
+    JSCell** roots();
+
+private:
+    static const size_t inlineCapacity = 128;
+    static const size_t nonInlineCapacity = 8192 / sizeof(JSCell*);
+    
+    void grow();
+
+    Heap* m_heap;
+    JSCell** m_roots;
+    size_t m_size;
+    size_t m_capacity;
+    JSCell* m_inlineRoots[inlineCapacity];
+};
+
+inline ConservativeRoots::ConservativeRoots(Heap* heap)
+    : m_heap(heap)
+    , m_roots(m_inlineRoots)
+    , m_size(0)
+    , m_capacity(inlineCapacity)
+{
+}
+
+inline ConservativeRoots::~ConservativeRoots()
+{
+    if (m_roots != m_inlineRoots)
+        OSAllocator::decommitAndRelease(m_roots, m_capacity * sizeof(JSCell*));
+}
+
+inline void ConservativeRoots::add(void* p)
+{
+    if (!m_heap->contains(p))
+        return;
+
+    if (m_size == m_capacity)
+        grow();
+
+    m_roots[m_size++] = reinterpret_cast<JSCell*>(p);
+}
+
+inline size_t ConservativeRoots::size()
+{
+    return m_size;
+}
+
+inline JSCell** ConservativeRoots::roots()
+{
+    return m_roots;
+}
+
+} // namespace JSC
+
+#endif // ConservativeRoots_h