mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
/*
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* Copyright (C) 2013-2020 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 "DisallowScope.h"
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#include "Heap.h"
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#include <wtf/NeverDestroyed.h>
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#include <wtf/ThreadSpecific.h>
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namespace JSC {
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class DeferGC {
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WTF_MAKE_NONCOPYABLE(DeferGC);
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WTF_FORBID_HEAP_ALLOCATION;
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public:
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DeferGC(Heap& heap)
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: m_heap(heap)
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{
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m_heap.incrementDeferralDepth();
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}
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~DeferGC()
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{
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if constexpr (validateDFGDoesGC)
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m_heap.verifyCanGC();
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m_heap.decrementDeferralDepthAndGCIfNeeded();
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}
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private:
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Heap& m_heap;
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};
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class DeferGCForAWhile {
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WTF_MAKE_NONCOPYABLE(DeferGCForAWhile);
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WTF_FORBID_HEAP_ALLOCATION;
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public:
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DeferGCForAWhile(Heap& heap)
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: m_heap(heap)
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{
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m_heap.incrementDeferralDepth();
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}
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~DeferGCForAWhile()
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{
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m_heap.decrementDeferralDepth();
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}
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private:
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Heap& m_heap;
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};
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class DisallowGC : public DisallowScope<DisallowGC> {
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WTF_MAKE_NONCOPYABLE(DisallowGC);
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WTF_FORBID_HEAP_ALLOCATION;
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typedef DisallowScope<DisallowGC> Base;
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public:
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#if ASSERT_ENABLED
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DisallowGC() = default;
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static void initialize()
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{
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s_scopeReentryCount.construct();
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}
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private:
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static unsigned scopeReentryCount()
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{
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return *s_scopeReentryCount.get();
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}
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static void setScopeReentryCount(unsigned value)
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{
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*s_scopeReentryCount.get() = value;
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}
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JS_EXPORT_PRIVATE static LazyNeverDestroyed<ThreadSpecific<unsigned, WTF::CanBeGCThread::True>> s_scopeReentryCount;
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#else
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ALWAYS_INLINE DisallowGC() { } // We need this to placate Clang due to unused warnings.
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ALWAYS_INLINE static void initialize() { }
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#endif // ASSERT_ENABLED
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friend class DisallowScope<DisallowGC>;
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};
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} // namespace JSC
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