GetterSetter.h 2.83 KB
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/*
 *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
 *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
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 *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
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 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 */

#ifndef GetterSetter_h
#define GetterSetter_h

#include "JSCell.h"

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#include "CallFrame.h"
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#include "Structure.h"
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namespace JSC {
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    class JSObject;

    // This is an internal value object which stores getter and setter functions
    // for a property.
    class GetterSetter : public JSCell {
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        friend class JIT;
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    private:        
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        GetterSetter(ExecState* exec)
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            : JSCell(exec->globalData(), exec->globalData().getterSetterStructure.get())
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        {
        }

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    public:
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        typedef JSCell Base;

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        static GetterSetter* create(ExecState* exec)
        {
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            GetterSetter* getterSetter = new (allocateCell<GetterSetter>(*exec->heap())) GetterSetter(exec);
            getterSetter->finishCreation(exec->globalData());
            return getterSetter;
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        }

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        virtual void visitChildren(SlotVisitor&);
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        JSObject* getter() const { return m_getter.get(); }
        void setGetter(JSGlobalData& globalData, JSObject* getter) { m_getter.set(globalData, this, getter); }
        JSObject* setter() const { return m_setter.get(); }
        void setSetter(JSGlobalData& globalData, JSObject* setter) { m_setter.set(globalData, this, setter); }
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        static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype)
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        {
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            return Structure::create(globalData, globalObject, prototype, TypeInfo(GetterSetterType, OverridesVisitChildren), &s_info);
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        }
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        static const ClassInfo s_info;

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    private:
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        WriteBarrier<JSObject> m_getter;
        WriteBarrier<JSObject> m_setter;  
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    };

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    GetterSetter* asGetterSetter(JSValue);
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    inline GetterSetter* asGetterSetter(JSValue value)
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    {
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        ASSERT(value.asCell()->isGetterSetter());
        return static_cast<GetterSetter*>(value.asCell());
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    }


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} // namespace JSC
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#endif // GetterSetter_h