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diff --git a/Source/JavaScriptCore/bytecode/CallMode.h b/Source/JavaScriptCore/bytecode/CallMode.h
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+++ b/Source/JavaScriptCore/bytecode/CallMode.h
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+/*
+ * Copyright (C) 2015 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 CallMode_h
+#define CallMode_h
+
+#include "CodeSpecializationKind.h"
+
+namespace JSC {
+
+enum class CallMode { Regular, Tail, Construct };
+
+enum FrameAction { KeepTheFrame = 0, ReuseTheFrame };
+
+inline CodeSpecializationKind specializationKindFor(CallMode callMode)
+{
+    if (callMode == CallMode::Construct)
+        return CodeForConstruct;
+
+    return CodeForCall;
+}
+
+} // namespace JSC
+
+namespace WTF {
+
+class PrintStream;
+void printInternal(PrintStream&, JSC::CallMode);
+
+} // namespace WTF
+
+#endif // CallMode_h
+