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diff --git a/Source/JavaScriptCore/API/JSClassRef.h b/Source/JavaScriptCore/API/JSClassRef.h
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+/*
+ * Copyright (C) 2006 Apple Computer, 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 COMPUTER, 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 COMPUTER, 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 JSClassRef_h
+#define JSClassRef_h
+
+#include "JSObjectRef.h"
+
+#include <runtime/JSObject.h>
+#include <runtime/Protect.h>
+#include <runtime/UString.h>
+#include <runtime/WeakGCPtr.h>
+#include <wtf/HashMap.h>
+
+struct StaticValueEntry : FastAllocBase {
+    StaticValueEntry(JSObjectGetPropertyCallback _getProperty, JSObjectSetPropertyCallback _setProperty, JSPropertyAttributes _attributes)
+        : getProperty(_getProperty), setProperty(_setProperty), attributes(_attributes)
+    {
+    }
+    
+    JSObjectGetPropertyCallback getProperty;
+    JSObjectSetPropertyCallback setProperty;
+    JSPropertyAttributes attributes;
+};
+
+struct StaticFunctionEntry : FastAllocBase {
+    StaticFunctionEntry(JSObjectCallAsFunctionCallback _callAsFunction, JSPropertyAttributes _attributes)
+        : callAsFunction(_callAsFunction), attributes(_attributes)
+    {
+    }
+
+    JSObjectCallAsFunctionCallback callAsFunction;
+    JSPropertyAttributes attributes;
+};
+
+typedef HashMap<RefPtr<StringImpl>, StaticValueEntry*> OpaqueJSClassStaticValuesTable;
+typedef HashMap<RefPtr<StringImpl>, StaticFunctionEntry*> OpaqueJSClassStaticFunctionsTable;
+
+struct OpaqueJSClass;
+
+// An OpaqueJSClass (JSClass) is created without a context, so it can be used with any context, even across context groups.
+// This structure holds data members that vary across context groups.
+struct OpaqueJSClassContextData : Noncopyable {
+    OpaqueJSClassContextData(OpaqueJSClass*);
+    ~OpaqueJSClassContextData();
+
+    // It is necessary to keep OpaqueJSClass alive because of the following rare scenario:
+    // 1. A class is created and used, so its context data is stored in JSGlobalData hash map.
+    // 2. The class is released, and when all JS objects that use it are collected, OpaqueJSClass
+    // is deleted (that's the part prevented by this RefPtr).
+    // 3. Another class is created at the same address.
+    // 4. When it is used, the old context data is found in JSGlobalData and used.
+    RefPtr<OpaqueJSClass> m_class;
+
+    OpaqueJSClassStaticValuesTable* staticValues;
+    OpaqueJSClassStaticFunctionsTable* staticFunctions;
+    JSC::WeakGCPtr<JSC::JSObject> cachedPrototype;
+};
+
+struct OpaqueJSClass : public ThreadSafeShared<OpaqueJSClass> {
+    static PassRefPtr<OpaqueJSClass> create(const JSClassDefinition*);
+    static PassRefPtr<OpaqueJSClass> createNoAutomaticPrototype(const JSClassDefinition*);
+    ~OpaqueJSClass();
+    
+    JSC::UString className();
+    OpaqueJSClassStaticValuesTable* staticValues(JSC::ExecState*);
+    OpaqueJSClassStaticFunctionsTable* staticFunctions(JSC::ExecState*);
+    JSC::JSObject* prototype(JSC::ExecState*);
+
+    OpaqueJSClass* parentClass;
+    OpaqueJSClass* prototypeClass;
+    
+    JSObjectInitializeCallback initialize;
+    JSObjectFinalizeCallback finalize;
+    JSObjectHasPropertyCallback hasProperty;
+    JSObjectGetPropertyCallback getProperty;
+    JSObjectSetPropertyCallback setProperty;
+    JSObjectDeletePropertyCallback deleteProperty;
+    JSObjectGetPropertyNamesCallback getPropertyNames;
+    JSObjectCallAsFunctionCallback callAsFunction;
+    JSObjectCallAsConstructorCallback callAsConstructor;
+    JSObjectHasInstanceCallback hasInstance;
+    JSObjectConvertToTypeCallback convertToType;
+
+private:
+    friend struct OpaqueJSClassContextData;
+
+    OpaqueJSClass();
+    OpaqueJSClass(const OpaqueJSClass&);
+    OpaqueJSClass(const JSClassDefinition*, OpaqueJSClass* protoClass);
+
+    OpaqueJSClassContextData& contextData(JSC::ExecState*);
+
+    // UStrings in these data members should not be put into any IdentifierTable.
+    JSC::UString m_className;
+    OpaqueJSClassStaticValuesTable* m_staticValues;
+    OpaqueJSClassStaticFunctionsTable* m_staticFunctions;
+};
+
+#endif // JSClassRef_h