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diff --git a/Source/JavaScriptCore/runtime/Completion.h b/Source/JavaScriptCore/runtime/Completion.h
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+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
+ *  Copyright (C) 2003, 2007 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef Completion_h
+#define Completion_h
+
+#include "JSValue.h"
+
+namespace JSC {
+
+    class ExecState;
+    class ScopeChain;
+    class SourceCode;
+
+    enum ComplType { Normal, Break, Continue, ReturnValue, Throw, Interrupted, Terminated };
+
+    /*
+     * Completion objects are used to convey the return status and value
+     * from functions.
+     */
+    class Completion {
+    public:
+        Completion(ComplType type = Normal, JSValue value = JSValue())
+            : m_type(type)
+            , m_value(value)
+        {
+        }
+
+        ComplType complType() const { return m_type; }
+        JSValue value() const { return m_value; }
+        void setValue(JSValue v) { m_value = v; }
+        bool isValueCompletion() const { return m_value; }
+
+    private:
+        ComplType m_type;
+        JSValue m_value;
+    };
+
+    Completion checkSyntax(ExecState*, const SourceCode&);
+    Completion evaluate(ExecState*, ScopeChain&, const SourceCode&, JSValue thisValue = JSValue());
+
+} // namespace JSC
+
+#endif // Completion_h