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diff --git a/Source/JavaScriptCore/debugger/DebuggerCallFrame.h b/Source/JavaScriptCore/debugger/DebuggerCallFrame.h
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+++ b/Source/JavaScriptCore/debugger/DebuggerCallFrame.h
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+/*
+ * Copyright (C) 2008, 2013, 2014 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.
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 DebuggerCallFrame_h
+#define DebuggerCallFrame_h
+
+#include "DebuggerPrimitives.h"
+#include "Strong.h"
+#include <wtf/NakedPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/text/TextPosition.h>
+
+namespace JSC {
+
+class DebuggerScope;
+class Exception;
+class ExecState;
+typedef ExecState CallFrame;
+
+class DebuggerCallFrame : public RefCounted<DebuggerCallFrame> {
+public:
+    enum Type { ProgramType, FunctionType };
+
+    static Ref<DebuggerCallFrame> create(CallFrame* callFrame)
+    {
+        return adoptRef(*new DebuggerCallFrame(callFrame));
+    }
+
+    JS_EXPORT_PRIVATE explicit DebuggerCallFrame(CallFrame*);
+
+    JS_EXPORT_PRIVATE RefPtr<DebuggerCallFrame> callerFrame();
+    ExecState* exec() const { return m_callFrame; }
+    JS_EXPORT_PRIVATE SourceID sourceID() const;
+
+    // line and column are in base 0 e.g. the first line is line 0.
+    int line() const { return m_position.m_line.zeroBasedInt(); }
+    int column() const { return m_position.m_column.zeroBasedInt(); }
+    JS_EXPORT_PRIVATE const TextPosition& position() const { return m_position; }
+
+    JS_EXPORT_PRIVATE JSGlobalObject* vmEntryGlobalObject() const;
+    JS_EXPORT_PRIVATE DebuggerScope* scope();
+    JS_EXPORT_PRIVATE String functionName() const;
+    JS_EXPORT_PRIVATE Type type() const;
+    JS_EXPORT_PRIVATE JSValue thisValue() const;
+    JSValue evaluate(const String&, NakedPtr<Exception>&);
+
+    bool isValid() const { return !!m_callFrame; }
+    JS_EXPORT_PRIVATE void invalidate();
+
+    // The following are only public for the Debugger's use only. They will be
+    // made private soon. Other clients should not use these.
+
+    JS_EXPORT_PRIVATE static TextPosition positionForCallFrame(CallFrame*);
+    JS_EXPORT_PRIVATE static SourceID sourceIDForCallFrame(CallFrame*);
+    static JSValue thisValueForCallFrame(CallFrame*);
+
+private:
+    CallFrame* m_callFrame;
+    RefPtr<DebuggerCallFrame> m_caller;
+    TextPosition m_position;
+    // The DebuggerPausedScope is responsible for calling invalidate() which,
+    // in turn, will clear this strong ref.
+    Strong<DebuggerScope> m_scope;
+};
+
+} // namespace JSC
+
+#endif // DebuggerCallFrame_h