Source/JavaScriptCore/runtime/JSNativeStdFunction.h

/*
 * Copyright (C) 2015-2018 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
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */

#pragma once

#include "JSFunction.h"

namespace JSC {

class JSGlobalObject;

using NativeStdFunction = WTF::Function<EncodedJSValue(JSGlobalObject*, CallFrame*)>;

class JSNativeStdFunction final : public JSFunction {
public:
    using Base = JSFunction;

    static constexpr unsigned StructureFlags = Base::StructureFlags;
    static constexpr bool needsDestruction = true;
    static void destroy(JSCell* cell)
    {
        static_cast<JSNativeStdFunction*>(cell)->JSNativeStdFunction::~JSNativeStdFunction();
    }

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

    DECLARE_EXPORT_INFO;

    JS_EXPORT_PRIVATE static JSNativeStdFunction* create(VM&, JSGlobalObject*, int length, const String& name, NativeStdFunction&&, Intrinsic = NoIntrinsic, NativeFunction nativeConstructor = callHostFunctionAsConstructor);

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

    const NativeStdFunction& function() { return m_function; }

private:
    JSNativeStdFunction(VM&, NativeExecutable*, JSGlobalObject*, Structure*, NativeStdFunction&&);
    void finishCreation(VM&, NativeExecutable*, int length, const String& name);
    static void visitChildren(JSCell*, SlotVisitor&);

    NativeStdFunction m_function;
};

} // namespace JSC