mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-13 12:20:25 +00:00
132 lines
3.7 KiB
C++
132 lines
3.7 KiB
C++
/*
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* Copyright (C) 2013, 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "DeferGC.h"
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#include <wtf/Lock.h>
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#include <wtf/NoLock.h>
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#include <wtf/Optional.h>
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namespace JSC {
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using ConcurrentJSLock = Lock;
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using ConcurrentJSLockerImpl = LockHolder;
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static_assert(sizeof(ConcurrentJSLock) == 1, "Regardless of status of concurrent JS flag, size of ConurrentJSLock is always one byte.");
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class ConcurrentJSLockerBase : public AbstractLocker {
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WTF_MAKE_NONCOPYABLE(ConcurrentJSLockerBase);
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public:
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explicit ConcurrentJSLockerBase(ConcurrentJSLock& lockable)
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: m_locker(&lockable)
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{
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}
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explicit ConcurrentJSLockerBase(ConcurrentJSLock* lockable)
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: m_locker(lockable)
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{
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}
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explicit ConcurrentJSLockerBase(NoLockingNecessaryTag)
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: m_locker(NoLockingNecessary)
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{
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}
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~ConcurrentJSLockerBase()
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{
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}
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void unlockEarly()
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{
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m_locker.unlockEarly();
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}
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private:
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ConcurrentJSLockerImpl m_locker;
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};
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class GCSafeConcurrentJSLocker : public ConcurrentJSLockerBase {
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public:
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GCSafeConcurrentJSLocker(ConcurrentJSLock& lockable, Heap& heap)
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: ConcurrentJSLockerBase(lockable)
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, m_deferGC(heap)
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{
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}
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GCSafeConcurrentJSLocker(ConcurrentJSLock* lockable, Heap& heap)
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: ConcurrentJSLockerBase(lockable)
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, m_deferGC(heap)
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{
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}
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~GCSafeConcurrentJSLocker()
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{
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// We have to unlock early due to the destruction order of base
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// vs. derived classes. If we didn't, then we would destroy the
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// DeferGC object before unlocking the lock which could cause a GC
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// and resulting deadlock.
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unlockEarly();
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}
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private:
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DeferGC m_deferGC;
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};
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class ConcurrentJSLocker : public ConcurrentJSLockerBase {
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public:
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ConcurrentJSLocker(ConcurrentJSLock& lockable)
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: ConcurrentJSLockerBase(lockable)
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#if !defined(NDEBUG)
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, m_disallowGC(std::in_place)
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#endif
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{
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}
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ConcurrentJSLocker(ConcurrentJSLock* lockable)
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: ConcurrentJSLockerBase(lockable)
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#if !defined(NDEBUG)
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, m_disallowGC(std::in_place)
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#endif
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{
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}
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ConcurrentJSLocker(NoLockingNecessaryTag)
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: ConcurrentJSLockerBase(NoLockingNecessary)
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#if !defined(NDEBUG)
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, m_disallowGC(WTF::nullopt)
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#endif
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{
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}
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ConcurrentJSLocker(int) = delete;
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#if !defined(NDEBUG)
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private:
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Optional<DisallowGC> m_disallowGC;
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#endif
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};
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} // namespace JSC
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