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101 lines (85 loc) · 2.71 KB
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/*
* Copyright (C) 2013 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
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DeferGC_h
#define DeferGC_h
#include "Heap.h"
#include <wtf/Noncopyable.h>
#include <wtf/ThreadSpecific.h>
namespace JSC {
class DeferGC {
WTF_MAKE_NONCOPYABLE(DeferGC);
public:
DeferGC(Heap& heap)
: m_heap(heap)
{
m_heap.incrementDeferralDepth();
}
~DeferGC()
{
m_heap.decrementDeferralDepthAndGCIfNeeded();
}
private:
Heap& m_heap;
};
class DeferGCForAWhile {
WTF_MAKE_NONCOPYABLE(DeferGCForAWhile);
public:
DeferGCForAWhile(Heap& heap)
: m_heap(heap)
{
m_heap.incrementDeferralDepth();
}
~DeferGCForAWhile()
{
m_heap.decrementDeferralDepth();
}
private:
Heap& m_heap;
};
#ifndef NDEBUG
class DisallowGC {
WTF_MAKE_NONCOPYABLE(DisallowGC);
public:
DisallowGC()
{
WTF::threadSpecificSet(s_isGCDisallowedOnCurrentThread, reinterpret_cast<void*>(true));
}
~DisallowGC()
{
WTF::threadSpecificSet(s_isGCDisallowedOnCurrentThread, reinterpret_cast<void*>(false));
}
static bool isGCDisallowedOnCurrentThread()
{
return !!WTF::threadSpecificGet(s_isGCDisallowedOnCurrentThread);
}
static void initialize()
{
WTF::threadSpecificKeyCreate(&s_isGCDisallowedOnCurrentThread, 0);
}
JS_EXPORT_PRIVATE static WTF::ThreadSpecificKey s_isGCDisallowedOnCurrentThread;
};
#endif // NDEBUG
} // namespace JSC
#endif // DeferGC_h