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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 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 PutPropertySlot_h
+#define PutPropertySlot_h
+
+#include "JSCJSValue.h"
+#include "PropertyOffset.h"
+
+#include <wtf/Assertions.h>
+
+namespace JSC {
+    
+class JSObject;
+class JSFunction;
+    
+class PutPropertySlot {
+public:
+    enum Type { Uncachable, ExistingProperty, NewProperty, SetterProperty, CustomProperty };
+    enum Context { UnknownContext, PutById, PutByIdEval };
+    typedef void (*PutValueFunc)(ExecState*, JSObject* base, EncodedJSValue thisObject, EncodedJSValue value);
+
+    PutPropertySlot(JSValue thisValue, bool isStrictMode = false, Context context = UnknownContext)
+        : m_type(Uncachable)
+        , m_base(0)
+        , m_thisValue(thisValue)
+        , m_offset(invalidOffset)
+        , m_isStrictMode(isStrictMode)
+        , m_context(context)
+        , m_putFunction(nullptr)
+    {
+    }
+
+    void setExistingProperty(JSObject* base, PropertyOffset offset)
+    {
+        m_type = ExistingProperty;
+        m_base = base;
+        m_offset = offset;
+    }
+
+    void setNewProperty(JSObject* base, PropertyOffset offset)
+    {
+        m_type = NewProperty;
+        m_base = base;
+        m_offset = offset;
+    }
+
+    void setCustomProperty(JSObject* base, PutValueFunc function)
+    {
+        m_type = CustomProperty;
+        m_base = base;
+        m_putFunction = function;
+    }
+
+    void setCacheableSetter(JSObject* base, PropertyOffset offset)
+    {
+        m_type = SetterProperty;
+        m_base = base;
+        m_offset = offset;
+    }
+
+    void setThisValue(JSValue thisValue)
+    {
+        m_thisValue = thisValue;
+    }
+
+    PutValueFunc customSetter() const { return m_putFunction; }
+
+    Context context() const { return static_cast<Context>(m_context); }
+
+    Type type() const { return m_type; }
+    JSObject* base() const { return m_base; }
+    JSValue thisValue() const { return m_thisValue; }
+
+    bool isStrictMode() const { return m_isStrictMode; }
+    bool isCacheablePut() const { return m_type == NewProperty || m_type == ExistingProperty; }
+    bool isCacheableSetter() const { return m_type == SetterProperty; }
+    bool isCacheableCustom() const { return m_type == CustomProperty; }
+
+    PropertyOffset cachedOffset() const
+    {
+        return m_offset;
+    }
+
+private:
+    Type m_type;
+    JSObject* m_base;
+    JSValue m_thisValue;
+    PropertyOffset m_offset;
+    bool m_isStrictMode;
+    uint8_t m_context;
+    PutValueFunc m_putFunction;
+};
+
+} // namespace JSC
+
+#endif // PutPropertySlot_h