Source/JavaScriptCore/runtime/JSCustomGetterSetterFunction.h

/*
 * Copyright (C) 2015-2019 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 */

#pragma once

#include "JSFunction.h"

namespace JSC {

class CustomGetterSetter;

class JSCustomGetterSetterFunction final : public JSFunction {
public:
    typedef JSFunction Base;

    // The Type is set to the number of arguments the resultant function will have.
    enum class Type { Getter = 0, Setter = 1 };

    static constexpr unsigned StructureFlags = Base::StructureFlags;

    template<typename CellType, SubspaceAccess mode>
    static IsoSubspace* subspaceFor(VM& vm)
    {
        return vm.customGetterSetterFunctionSpace<mode>();
    }

    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
    {
        ASSERT(globalObject);
        return Structure::create(vm, globalObject, prototype, TypeInfo(JSFunctionType, StructureFlags), info());
    }

    static JSCustomGetterSetterFunction* create(VM&, JSGlobalObject*, CustomGetterSetter*, const Type, const PropertyName&);

    DECLARE_EXPORT_INFO;

protected:
    static void visitChildren(JSCell*, SlotVisitor&);

private:
    JSCustomGetterSetterFunction(VM&, JSGlobalObject*, Structure*, Type, const PropertyName&);
    void finishCreation(VM&, NativeExecutable*, CustomGetterSetter*, const String&);

    static EncodedJSValue JSC_HOST_CALL customGetterSetterFunctionCall(JSGlobalObject*, CallFrame*);

    CustomGetterSetter* customGetterSetter() const { return m_getterSetter.get(); }
    bool isSetter() const { return m_type == Type::Setter; }
    const PropertyName& propertyName() const { return m_propertyName; }

    WriteBarrier<CustomGetterSetter> m_getterSetter;
    Type m_type;
    PropertyName m_propertyName;
};

} // namespace JSC