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diff --git a/Source/JavaScriptCore/bytecode/MethodCallLinkStatus.h b/Source/JavaScriptCore/bytecode/MethodCallLinkStatus.h
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+++ b/Source/JavaScriptCore/bytecode/MethodCallLinkStatus.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 MethodCallLinkStatus_h
+#define MethodCallLinkStatus_h
+
+namespace JSC {
+
+class CodeBlock;
+class JSObject;
+class Structure;
+
+class MethodCallLinkStatus {
+public:
+    MethodCallLinkStatus()
+        : m_structure(0)
+        , m_prototypeStructure(0)
+        , m_function(0)
+        , m_prototype(0)
+    {
+    }
+    
+    MethodCallLinkStatus(
+        Structure* structure,
+        Structure* prototypeStructure,
+        JSObject* function,
+        JSObject* prototype)
+        : m_structure(structure)
+        , m_prototypeStructure(prototypeStructure)
+        , m_function(function)
+        , m_prototype(prototype)
+    {
+        if (!m_function) {
+            ASSERT(!m_structure);
+            ASSERT(!m_prototypeStructure);
+            ASSERT(!m_prototype);
+        } else
+            ASSERT(m_structure);
+        
+        ASSERT(!m_prototype == !m_prototypeStructure);
+    }
+    
+    static MethodCallLinkStatus computeFor(CodeBlock*, unsigned bytecodeIndex);
+
+    bool isSet() const { return !!m_function; }
+    bool operator!() const { return !m_function; }
+    
+    bool needsPrototypeCheck() const { return !!m_prototype; }
+    
+    Structure* structure() { return m_structure; }
+    Structure* prototypeStructure() { return m_prototypeStructure; }
+    JSObject* function() const { return m_function; }
+    JSObject* prototype() const { return m_prototype; }
+    
+private:
+    Structure* m_structure;
+    Structure* m_prototypeStructure;
+    JSObject* m_function;
+    JSObject* m_prototype;
+};
+
+} // namespace JSC
+
+#endif // MethodCallLinkStatus_h
+