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diff --git a/Source/JavaScriptCore/runtime/PutPropertySlot.h b/Source/JavaScriptCore/runtime/PutPropertySlot.h
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+++ b/Source/JavaScriptCore/runtime/PutPropertySlot.h
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+// -*- mode: c++; c-basic-offset: 4 -*-
+/*
+ * Copyright (C) 2008 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 COMPUTER, 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 COMPUTER, 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 PutPropertySlot_h
+#define PutPropertySlot_h
+
+#include <wtf/Assertions.h>
+
+namespace JSC {
+    
+    class JSObject;
+    class JSFunction;
+    
+    class PutPropertySlot {
+    public:
+        enum Type { Uncachable, ExistingProperty, NewProperty };
+
+        PutPropertySlot(bool isStrictMode = false)
+            : m_type(Uncachable)
+            , m_base(0)
+            , m_isStrictMode(isStrictMode)
+        {
+        }
+
+        void setExistingProperty(JSObject* base, size_t offset)
+        {
+            m_type = ExistingProperty;
+            m_base = base;
+            m_offset = offset;
+        }
+
+        void setNewProperty(JSObject* base, size_t offset)
+        {
+            m_type = NewProperty;
+            m_base = base;
+            m_offset = offset;
+        }
+
+        Type type() const { return m_type; }
+        JSObject* base() const { return m_base; }
+
+        bool isStrictMode() const { return m_isStrictMode; }
+        bool isCacheable() const { return m_type != Uncachable; }
+        size_t cachedOffset() const {
+            ASSERT(isCacheable());
+            return m_offset;
+        }
+    private:
+        Type m_type;
+        JSObject* m_base;
+        size_t m_offset;
+        bool m_isStrictMode;
+    };
+
+} // namespace JSC
+
+#endif // PutPropertySlot_h