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diff --git a/Source/JavaScriptCore/API/JSVirtualMachineInternal.h b/Source/JavaScriptCore/API/JSVirtualMachineInternal.h
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+/*
+ * Copyright (C) 2013 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 JSVirtualMachineInternal_h
+#define JSVirtualMachineInternal_h
+
+#import <JavaScriptCore/JavaScriptCore.h>
+
+#if JSC_OBJC_API_ENABLED
+
+namespace JSC {
+class VM;
+class SlotVisitor;
+}
+
+#if defined(__OBJC__)
+@interface JSVirtualMachine(Internal)
+
+JSContextGroupRef getGroupFromVirtualMachine(JSVirtualMachine *);
+
++ (JSVirtualMachine *)virtualMachineWithContextGroupRef:(JSContextGroupRef)group;
+
+- (JSContext *)contextForGlobalContextRef:(JSGlobalContextRef)globalContext;
+- (void)addContext:(JSContext *)wrapper forGlobalContextRef:(JSGlobalContextRef)globalContext;
+
+- (NSMapTable *)externalObjectGraph;
+
+@end
+#endif // defined(__OBJC__)
+
+void scanExternalObjectGraph(JSC::VM&, JSC::SlotVisitor&, void* root);
+
+#endif
+
+#endif // JSVirtualMachineInternal_h