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Copy pathDeallocator.cpp
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100 lines (84 loc) · 2.88 KB
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/*
* Copyright (C) 2014 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 "Chunk.h"
#include "Deallocator.h"
#include "Heap.h"
#include "Inline.h"
#include "Object.h"
#include "PerProcess.h"
#include <algorithm>
#include <cstdlib>
#include <sys/mman.h>
using namespace std;
namespace bmalloc {
Deallocator::Deallocator(Heap* heap)
: m_isBmallocEnabled(heap->environment().isBmallocEnabled())
{
if (!m_isBmallocEnabled) {
// Fill the object log in order to disable the fast path.
while (m_objectLog.size() != m_objectLog.capacity())
m_objectLog.push(nullptr);
}
}
Deallocator::~Deallocator()
{
scavenge();
}
void Deallocator::scavenge()
{
if (m_isBmallocEnabled)
processObjectLog();
}
void Deallocator::processObjectLog(std::lock_guard<StaticMutex>& lock)
{
Heap* heap = PerProcess<Heap>::getFastCase();
for (Object object : m_objectLog)
heap->derefSmallLine(lock, object);
m_objectLog.clear();
}
void Deallocator::processObjectLog()
{
std::lock_guard<StaticMutex> lock(PerProcess<Heap>::mutex());
processObjectLog(lock);
}
void Deallocator::deallocateSlowCase(void* object)
{
if (!m_isBmallocEnabled) {
free(object);
return;
}
if (!object)
return;
std::lock_guard<StaticMutex> lock(PerProcess<Heap>::mutex());
if (PerProcess<Heap>::getFastCase()->isLarge(lock, object)) {
PerProcess<Heap>::getFastCase()->deallocateLarge(lock, object);
return;
}
if (m_objectLog.size() == m_objectLog.capacity())
processObjectLog(lock);
m_objectLog.push(object);
}
} // namespace bmalloc