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diff --git a/Source/JavaScriptCore/dfg/DFGGraph.h b/Source/JavaScriptCore/dfg/DFGGraph.h
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+/*
+ * Copyright (C) 2011 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 DFGGraph_h
+#define DFGGraph_h
+
+#if ENABLE(DFG_JIT)
+
+#include <dfg/DFGNode.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class CodeBlock;
+
+namespace DFG {
+
+// 
+// === Graph ===
+//
+// The dataflow graph is an ordered vector of nodes.
+// The order may be significant for nodes with side-effects (property accesses, value conversions).
+// Nodes that are 'dead' remain in the vector with refCount 0.
+class Graph : public Vector<Node, 64> {
+public:
+    // Mark a node as being referenced.
+    void ref(NodeIndex nodeIndex)
+    {
+        // If the value (before incrementing) was at reCount zero then we need to ref its children.
+        if (!at(nodeIndex).refCount++)
+            refChildren(nodeIndex);
+    }
+
+#ifndef NDEBUG
+    // CodeBlock is optional, but may allow additional information to be dumped (e.g. Identifier names).
+    void dump(CodeBlock* = 0);
+#endif
+
+private:
+    // When a node's refCount goes from 0 to 1, it must (logically) recursively ref all of its children.
+    void refChildren(NodeIndex);
+};
+
+} } // namespace JSC::DFG
+
+#endif
+#endif