// -*- 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()

            : m_type(Uncachable)

            , m_base(0)

        {

        }

        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 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;

    };

} // namespace JSC

#endif // PutPropertySlot_h