JSActivation.h   [plain text]

/*
 * 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*, FunctionExecutable*);
        virtual ~JSActivation();

        virtual void visitChildren(SlotVisitor&);

        virtual bool isDynamicScope(bool& requiresDynamicChecks) const;

        virtual bool isActivationObject() const { return true; }

        virtual bool getOwnPropertySlot(ExecState*, const Identifier&, PropertySlot&);
        virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode);

        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;
        virtual JSValue toStrictThisObject(ExecState*) const;

        void copyRegisters(JSGlobalData&);
        
        static const ClassInfo s_info;

        static Structure* createStructure(JSGlobalData& globalData, JSValue proto) { return Structure::create(globalData, proto, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount, &s_info); }

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

    private:
        bool symbolTableGet(const Identifier&, PropertySlot&);
        bool symbolTableGet(const Identifier&, PropertyDescriptor&);
        bool symbolTableGet(const Identifier&, PropertySlot&, bool& slotIsWriteable);
        bool symbolTablePut(JSGlobalData&, const Identifier&, JSValue);
        bool symbolTablePutWithAttributes(JSGlobalData&, const Identifier&, JSValue, unsigned attributes);

        static JSValue argumentsGetter(ExecState*, JSValue, const Identifier&);
        NEVER_INLINE PropertySlot::GetValueFunc getArgumentsGetter();

        int m_numParametersMinusThis;
        int m_numCapturedVars : 31;
        bool m_requiresDynamicChecks : 1;
        int m_argumentsRegister;
    };

    JSActivation* asActivation(JSValue);

    inline JSActivation* asActivation(JSValue value)
    {
        ASSERT(asObject(value)->inherits(&JSActivation::s_info));
        return static_cast<JSActivation*>(asObject(value));
    }
    
    ALWAYS_INLINE JSActivation* Register::activation() const
    {
        return asActivation(jsValue());
    }

} // namespace JSC

#endif // JSActivation_h