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diff --git a/Source/JavaScriptCore/runtime/DirectArgumentsOffset.h b/Source/JavaScriptCore/runtime/DirectArgumentsOffset.h
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+++ b/Source/JavaScriptCore/runtime/DirectArgumentsOffset.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 DirectArgumentsOffset_h
+#define DirectArgumentsOffset_h
+
+#include "GenericOffset.h"
+#include <wtf/PrintStream.h>
+
+namespace JSC {
+
+// This is an offset into the special arguments object, which captures the arguments to a
+// function. It only comes into play if the arguments aren't also lifted into the activation.
+// If they were then accesses to the arguments would resolve to a ScopeOffset and not a
+// DirectArgumentsOffset.
+class DirectArgumentsOffset : public GenericOffset<DirectArgumentsOffset> {
+public:
+    DirectArgumentsOffset() { }
+    
+    explicit DirectArgumentsOffset(unsigned offset)
+        : GenericOffset(offset)
+    {
+    }
+    
+    void dump(PrintStream&) const;
+};
+
+} // namespace JSC
+
+#endif // DirectArgumentsOffset_h
+