Source/JavaScriptCore/bytecode/GetterSetterAccessCase.h

/*
 * Copyright (C) 2017-2020 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
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 *    documentation and/or other materials provided with the distribution.
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#pragma once

#if ENABLE(JIT)

#include "MacroAssemblerCodeRef.h"
#include "ProxyableAccessCase.h"

namespace JSC {

class GetterSetterAccessCase final : public ProxyableAccessCase {
public:
    typedef ProxyableAccessCase Base;
    friend class AccessCase;

    // This can return null if it hasn't been generated yet. That's
    // actually somewhat likely because of how we do buffering of new cases.
    // CallLinkInfo's ownership is held both by generated code via GCAwareJITStubRoutine and PolymorphicAccess.
    // The ownership relation is PolymorphicAccess -> GCAwareJITStubRoutine -> CallLinkInfo.
    // PolymorphicAccess can be destroyed while GCAwareJITStubRoutine is alive if we are destroying PolymorphicAccess
    // while we are executing GCAwareJITStubRoutine. It is not possible that GetterSetterAccessCase is alive while
    // GCAwareJITStubRoutine is destroyed.
    CallLinkInfo* callLinkInfo() const { return m_callLinkInfo; }
    JSObject* customSlotBase() const { return m_customSlotBase.get(); }
    Optional<DOMAttributeAnnotation> domAttribute() const { return m_domAttribute; }

    bool hasAlternateBase() const final;
    JSObject* alternateBase() const final;

    void emitDOMJITGetter(AccessGenerationState&, const DOMJIT::GetterSetter*, GPRReg baseForGetGPR);

    static std::unique_ptr<AccessCase> create(
        VM&, JSCell* owner, AccessType, CacheableIdentifier, PropertyOffset, Structure*,
        const ObjectPropertyConditionSet&, bool viaProxy, WatchpointSet* additionalSet, FunctionPtr<CustomAccessorPtrTag> customGetter,
        JSObject* customSlotBase, Optional<DOMAttributeAnnotation>, RefPtr<PolyProtoAccessChain>&&);

    static std::unique_ptr<AccessCase> create(VM&, JSCell* owner, AccessType, Structure*, CacheableIdentifier, PropertyOffset,
        const ObjectPropertyConditionSet&, RefPtr<PolyProtoAccessChain>&&, bool viaProxy = false,
        FunctionPtr<CustomAccessorPtrTag> customSetter = nullptr, JSObject* customSlotBase = nullptr);

    void dumpImpl(PrintStream&, CommaPrinter&) const final;
    std::unique_ptr<AccessCase> clone() const final;

    ~GetterSetterAccessCase() final;

    FunctionPtr<CustomAccessorPtrTag> customAccessor() const { return m_customAccessor; }

private:
    GetterSetterAccessCase(VM&, JSCell*, AccessType, CacheableIdentifier, PropertyOffset, Structure*, const ObjectPropertyConditionSet&, bool viaProxy, WatchpointSet* additionalSet, JSObject* customSlotBase, RefPtr<PolyProtoAccessChain>&&);

    GetterSetterAccessCase(const GetterSetterAccessCase&);

    WriteBarrier<JSObject> m_customSlotBase;
    CallLinkInfo* m_callLinkInfo { nullptr };
    FunctionPtr<CustomAccessorPtrTag> m_customAccessor;
    Optional<DOMAttributeAnnotation> m_domAttribute;
};

} // namespace JSC

#endif // ENABLE(JIT)