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diff --git a/Source/JavaScriptCore/dfg/DFGBasicBlock.h b/Source/JavaScriptCore/dfg/DFGBasicBlock.h
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+++ b/Source/JavaScriptCore/dfg/DFGBasicBlock.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 DFGBasicBlock_h
+#define DFGBasicBlock_h
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGAbstractValue.h"
+#include "DFGNode.h"
+#include "DFGOperands.h"
+#include <wtf/OwnPtr.h>
+#include <wtf/Vector.h>
+
+namespace JSC { namespace DFG {
+
+typedef Vector <BlockIndex, 2> PredecessorList;
+
+struct BasicBlock {
+    BasicBlock(unsigned bytecodeBegin, NodeIndex begin, unsigned numArguments, unsigned numLocals)
+        : bytecodeBegin(bytecodeBegin)
+        , begin(begin)
+        , end(NoNode)
+        , isOSRTarget(false)
+        , cfaHasVisited(false)
+        , cfaShouldRevisit(false)
+#if !ASSERT_DISABLED
+        , isLinked(false)
+#endif
+        , isReachable(false)
+        , variablesAtHead(numArguments, numLocals)
+        , variablesAtTail(numArguments, numLocals)
+        , valuesAtHead(numArguments, numLocals)
+        , valuesAtTail(numArguments, numLocals)
+    {
+    }
+    
+    void ensureLocals(unsigned newNumLocals)
+    {
+        variablesAtHead.ensureLocals(newNumLocals);
+        variablesAtTail.ensureLocals(newNumLocals);
+        valuesAtHead.ensureLocals(newNumLocals);
+        valuesAtTail.ensureLocals(newNumLocals);
+    }
+
+    // This value is used internally for block linking and OSR entry. It is mostly meaningless
+    // for other purposes due to inlining.
+    unsigned bytecodeBegin;
+    
+    NodeIndex begin;
+    NodeIndex end;
+    bool isOSRTarget;
+    bool cfaHasVisited;
+    bool cfaShouldRevisit;
+#if !ASSERT_DISABLED
+    bool isLinked;
+#endif
+    bool isReachable;
+    
+    PredecessorList m_predecessors;
+    
+    Operands<NodeIndex, NodeIndexTraits> variablesAtHead;
+    Operands<NodeIndex, NodeIndexTraits> variablesAtTail;
+    
+    Operands<AbstractValue> valuesAtHead;
+    Operands<AbstractValue> valuesAtTail;
+};
+
+struct UnlinkedBlock {
+    BlockIndex m_blockIndex;
+    bool m_needsNormalLinking;
+    bool m_needsEarlyReturnLinking;
+    
+    UnlinkedBlock() { }
+    
+    explicit UnlinkedBlock(BlockIndex blockIndex)
+        : m_blockIndex(blockIndex)
+        , m_needsNormalLinking(true)
+        , m_needsEarlyReturnLinking(false)
+    {
+    }
+};
+    
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGBasicBlock_h
+