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diff --git a/Source/JavaScriptCore/dfg/DFGArgumentPosition.h b/Source/JavaScriptCore/dfg/DFGArgumentPosition.h
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+++ b/Source/JavaScriptCore/dfg/DFGArgumentPosition.h
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+/*
+ * Copyright (C) 2012 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 DFGArgumentPosition_h
+#define DFGArgumentPosition_h
+
+#include "DFGDoubleFormatState.h"
+#include "DFGVariableAccessData.h"
+#include "PredictedType.h"
+
+namespace JSC { namespace DFG {
+
+class ArgumentPosition {
+public:
+    ArgumentPosition()
+        : m_prediction(PredictNone)
+        , m_doubleFormatState(EmptyDoubleFormatState)
+    {
+    }
+    
+    void addVariable(VariableAccessData* variable)
+    {
+        m_variables.append(variable);
+    }
+    
+    bool mergeArgumentAwareness()
+    {
+        bool changed = false;
+        for (unsigned i = 0; i < m_variables.size(); ++i) {
+            changed |= mergePrediction(m_prediction, m_variables[i]->argumentAwarePrediction());
+            changed |= mergeDoubleFormatState(m_doubleFormatState, m_variables[i]->doubleFormatState());
+        }
+        if (!changed)
+            return false;
+        changed = false;
+        for (unsigned i = 0; i < m_variables.size(); ++i) {
+            changed |= m_variables[i]->mergeArgumentAwarePrediction(m_prediction);
+            changed |= m_variables[i]->mergeDoubleFormatState(m_doubleFormatState);
+        }
+        return changed;
+    }
+    
+private:
+    PredictedType m_prediction;
+    DoubleFormatState m_doubleFormatState;
+    
+    Vector<VariableAccessData*, 2> m_variables;
+};
+
+} } // namespace JSC::DFG
+
+#endif // DFGArgumentPosition_h
+