PutPropertySlot.h   [plain text]

// -*- 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 <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_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;
        }

        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