/*

 * Copyright (C) 2008, 2009 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.

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 JSActivation_h

#define JSActivation_h

#include "CodeBlock.h"

#include "JSVariableObject.h"

#include "SymbolTable.h"

#include "Nodes.h"

namespace JSC {

    class Arguments;

    class Register;

    class JSActivation : public JSVariableObject {

        typedef JSVariableObject Base;

    public:

        JSActivation(CallFrame*, NonNullPassRefPtr<FunctionExecutable>);

        virtual ~JSActivation();

        virtual void markChildren(MarkStack&);

        virtual bool isDynamicScope(bool& requiresDynamicChecks) const;

        virtual bool isActivationObject() const { return true; }

        virtual bool getOwnPropertySlot(ExecState*, const Identifier&, PropertySlot&);

        virtual void put(ExecState*, const Identifier&, JSValue, PutPropertySlot&);

        virtual void putWithAttributes(ExecState*, const Identifier&, JSValue, unsigned attributes);

        virtual bool deleteProperty(ExecState*, const Identifier& propertyName);

        virtual JSObject* toThisObject(ExecState*) const;

        void copyRegisters();

        virtual const ClassInfo* classInfo() const { return &info; }

        static const ClassInfo info;

        static PassRefPtr<Structure> createStructure(JSValue proto) { return Structure::create(proto, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount); }

    protected:

        static const unsigned StructureFlags = OverridesGetOwnPropertySlot | NeedsThisConversion | OverridesMarkChildren | OverridesGetPropertyNames | JSVariableObject::StructureFlags;

    private:

        struct JSActivationData : public JSVariableObjectData {

            JSActivationData(NonNullPassRefPtr<FunctionExecutable> _functionExecutable, Register* registers)

                : JSVariableObjectData(_functionExecutable->symbolTable(), registers)

                , functionExecutable(_functionExecutable)

            {

                // We have to manually ref and deref the symbol table as JSVariableObjectData

                // doesn't know about SharedSymbolTable

                functionExecutable->symbolTable()->ref();

            }

            ~JSActivationData()

            {

                static_cast<SharedSymbolTable*>(symbolTable)->deref();

            }

            RefPtr<FunctionExecutable> functionExecutable;

        };

        static JSValue argumentsGetter(ExecState*, JSValue, const Identifier&);

        NEVER_INLINE PropertySlot::GetValueFunc getArgumentsGetter();

        JSActivationData* d() const { return static_cast<JSActivationData*>(JSVariableObject::d); }

    };

    JSActivation* asActivation(JSValue);

    inline JSActivation* asActivation(JSValue value)

    {

        ASSERT(asObject(value)->inherits(&JSActivation::info));

        return static_cast<JSActivation*>(asObject(value));

    }

} // namespace JSC

#endif // JSActivation_h