xref: /external/webkit/Source/JavaScriptCore/runtime/JSActivation.h

/*
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 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
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 *     its contributors may be used to endorse or promote products derived
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#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 markChildren(MarkStack&);

        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 | OverridesMarkChildren | 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