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Deallocator.cpp
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89 lines (75 loc) · 2.51 KB
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/*
* Copyright (C) 2014-2018 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
* 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.
*/
#include "BAssert.h"
#include "BInline.h"
#include "Chunk.h"
#include "Deallocator.h"
#include "Environment.h"
#include "Heap.h"
#include "Object.h"
#include "PerProcess.h"
#include <algorithm>
#include <cstdlib>
#include <sys/mman.h>
#if !BUSE(LIBPAS)
namespace bmalloc {
Deallocator::Deallocator(Heap& heap)
: m_heap(heap)
{
BASSERT(!Environment::get()->isDebugHeapEnabled());
}
Deallocator::~Deallocator()
{
scavenge();
}
void Deallocator::scavenge()
{
UniqueLockHolder lock(Heap::mutex());
processObjectLog(lock);
m_heap.deallocateLineCache(lock, lineCache(lock));
}
void Deallocator::processObjectLog(UniqueLockHolder& lock)
{
for (Object object : m_objectLog)
m_heap.derefSmallLine(lock, object, lineCache(lock));
m_objectLog.clear();
}
void Deallocator::deallocateSlowCase(void* object)
{
if (!object)
return;
if (m_heap.isLarge(object)) {
UniqueLockHolder lock(Heap::mutex());
m_heap.deallocateLarge(lock, object);
return;
}
if (m_objectLog.size() == m_objectLog.capacity()) {
UniqueLockHolder lock(Heap::mutex());
processObjectLog(lock);
}
m_objectLog.push(object);
}
} // namespace bmalloc
#endif