Source/JavaScriptCore/API/JSCallbackConstructor.h

/*
 * Copyright (C) 2006-2019 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
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 * 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. ``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
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 */

#ifndef JSCallbackConstructor_h
#define JSCallbackConstructor_h

#include "JSObject.h"
#include "JSObjectRef.h"

namespace JSC {

class JSCallbackConstructor final : public JSNonFinalObject {
public:
    using Base = JSNonFinalObject;
    static constexpr unsigned StructureFlags = Base::StructureFlags | ImplementsHasInstance | ImplementsDefaultHasInstance;
    static constexpr bool needsDestruction = true;

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

    static JSCallbackConstructor* create(JSGlobalObject* globalObject, Structure* structure, JSClassRef classRef, JSObjectCallAsConstructorCallback callback) 
    {
        VM& vm = getVM(globalObject);
        JSCallbackConstructor* constructor = new (NotNull, allocateCell<JSCallbackConstructor>(vm.heap)) JSCallbackConstructor(globalObject, structure, classRef, callback);
        constructor->finishCreation(globalObject, classRef);
        return constructor;
    }
    
    ~JSCallbackConstructor();
    static void destroy(JSCell*);
    JSClassRef classRef() const { return m_class; }
    JSObjectCallAsConstructorCallback callback() const { return m_callback; }
    DECLARE_INFO;

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

protected:
    JSCallbackConstructor(JSGlobalObject*, Structure*, JSClassRef, JSObjectCallAsConstructorCallback);
    void finishCreation(JSGlobalObject*, JSClassRef);

private:
    friend struct APICallbackFunction;

    static ConstructType getConstructData(JSCell*, ConstructData&);

    JSObjectCallAsConstructorCallback constructCallback() { return m_callback; }

    JSClassRef m_class;
    JSObjectCallAsConstructorCallback m_callback;
};

} // namespace JSC

#endif // JSCallbackConstructor_h