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diff --git a/Source/JavaScriptCore/runtime/RopeImpl.h b/Source/JavaScriptCore/runtime/RopeImpl.h
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+/*
+ * Copyright (C) 2009, 2010 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 RopeImpl_h
+#define RopeImpl_h
+
+#include <wtf/text/StringImpl.h>
+
+namespace JSC {
+
+class RopeImpl : public StringImplBase {
+public:
+    // A RopeImpl is composed from a set of smaller strings called Fibers.
+    // Each Fiber in a rope is either StringImpl or another RopeImpl.
+    typedef StringImplBase* Fiber;
+
+    // Creates a RopeImpl comprising of 'fiberCount' Fibers.
+    // The RopeImpl is constructed in an uninitialized state - initialize must be called for each Fiber in the RopeImpl.
+    static PassRefPtr<RopeImpl> tryCreateUninitialized(unsigned fiberCount)
+    {
+        void* allocation;
+        if (tryFastMalloc(sizeof(RopeImpl) + (fiberCount - 1) * sizeof(Fiber)).getValue(allocation))
+            return adoptRef(new (allocation) RopeImpl(fiberCount));
+        return 0;
+    }
+
+    static bool isRope(Fiber fiber)
+    {
+        return !fiber->isStringImpl();
+    }
+
+    static void deref(Fiber fiber)
+    {
+        if (isRope(fiber))
+            static_cast<RopeImpl*>(fiber)->deref();
+        else
+            static_cast<StringImpl*>(fiber)->deref();
+    }
+
+    void initializeFiber(unsigned &index, Fiber fiber)
+    {
+        m_fibers[index++] = fiber;
+        fiber->ref();
+        m_length += fiber->length();
+    }
+
+    unsigned fiberCount() { return m_size; }
+    Fiber* fibers() { return m_fibers; }
+
+    ALWAYS_INLINE void deref()
+    {
+        m_refCountAndFlags -= s_refCountIncrement;
+        if (!(m_refCountAndFlags & s_refCountMask))
+            destructNonRecursive();
+    }
+
+private:
+    RopeImpl(unsigned fiberCount)
+        : StringImplBase(ConstructNonStringImpl)
+        , m_size(fiberCount)
+    {
+    }
+
+    void destructNonRecursive();
+    void derefFibersNonRecursive(Vector<RopeImpl*, 32>& workQueue);
+
+    bool hasOneRef() { return (m_refCountAndFlags & s_refCountMask) == s_refCountIncrement; }
+
+    unsigned m_size;
+    Fiber m_fibers[1];
+};
+
+}
+
+#endif