Source/JavaScriptCore/runtime/DeferTermination.h

/*
 * Copyright (C) 2021 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. ``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,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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 */

#pragma once

#include "VM.h"
#include <wtf/ForbidHeapAllocation.h>
#include <wtf/Noncopyable.h>

namespace JSC {

template<VMTraps::DeferAction deferAction = VMTraps::DeferAction::DeferUntilEndOfScope>
class DeferTermination {
    WTF_MAKE_NONCOPYABLE(DeferTermination);
    WTF_FORBID_HEAP_ALLOCATION;
public:
    DeferTermination(VM& vm)
        : m_vm(vm)
    {
        m_vm.traps().deferTermination(deferAction);
    }
    
    ~DeferTermination()
    {
        m_vm.traps().undoDeferTermination(deferAction);
    }

private:
    VM& m_vm;
};

using DeferTerminationForAWhile = DeferTermination<VMTraps::DeferAction::DeferForAWhile>;

} // namespace JSC