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diff --git a/Source/JavaScriptCore/interpreter/CallFrameClosure.h b/Source/JavaScriptCore/interpreter/CallFrameClosure.h
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+++ b/Source/JavaScriptCore/interpreter/CallFrameClosure.h
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+/*
+ * Copyright (C) 2009 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 CallFrameClosure_h
+#define CallFrameClosure_h
+
+namespace JSC {
+
+struct CallFrameClosure {
+    CallFrame* oldCallFrame;
+    CallFrame* newCallFrame;
+    JSFunction* function;
+    FunctionExecutable* functionExecutable;
+    JSGlobalData* globalData;
+    Register* oldEnd;
+    ScopeChainNode* scopeChain;
+    int expectedParams;
+    int providedParams;
+    
+    void setArgument(int arg, JSValue value)
+    {
+        if (arg < expectedParams)
+            newCallFrame[arg - RegisterFile::CallFrameHeaderSize - expectedParams] = value;
+        else
+            newCallFrame[arg - RegisterFile::CallFrameHeaderSize - expectedParams - providedParams] = value;
+    }
+
+    void resetCallFrame()
+    {
+        newCallFrame->setScopeChain(scopeChain);
+        for (int i = providedParams; i < expectedParams; ++i)
+            newCallFrame[i - RegisterFile::CallFrameHeaderSize - expectedParams] = jsUndefined();
+    }
+};
+
+}
+
+#endif