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diff --git a/Source/JavaScriptCore/heap/OpaqueRootSet.h b/Source/JavaScriptCore/heap/OpaqueRootSet.h
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+++ b/Source/JavaScriptCore/heap/OpaqueRootSet.h
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+/*
+ * Copyright (C) 2014 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 OpaqueRootSet_h
+#define OpaqueRootSet_h
+
+#include <wtf/HashSet.h>
+
+namespace JSC {
+
+class OpaqueRootSet {
+    WTF_MAKE_NONCOPYABLE(OpaqueRootSet);
+public:
+    OpaqueRootSet()
+        : m_lastQueriedRoot(nullptr)
+        , m_containsLastQueriedRoot(false)
+    {
+    }
+
+    bool contains(void* root) const
+    {
+        if (root != m_lastQueriedRoot) {
+            m_lastQueriedRoot = root;
+            m_containsLastQueriedRoot = m_roots.contains(root);
+        }
+        return m_containsLastQueriedRoot;
+    }
+
+    bool isEmpty() const
+    {
+        return m_roots.isEmpty();
+    }
+
+    void clear()
+    {
+        m_roots.clear();
+        m_lastQueriedRoot = nullptr;
+        m_containsLastQueriedRoot = false;
+    }
+
+    void add(void* root)
+    {
+        if (root == m_lastQueriedRoot)
+            m_containsLastQueriedRoot = true;
+        m_roots.add(root);
+    }
+
+    int size() const
+    {
+        return m_roots.size();
+    }
+
+    HashSet<void*>::const_iterator begin() const
+    {
+        return m_roots.begin();
+    }
+
+    HashSet<void*>::const_iterator end() const
+    {
+        return m_roots.end();
+    }
+
+
+private:
+    HashSet<void*> m_roots;
+    mutable void* m_lastQueriedRoot;
+    mutable bool m_containsLastQueriedRoot;
+};
+
+} // namespace JSC
+
+#endif // OpaqueRootSet_h