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/*
* Copyright (C) 2017-2021 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 "config.h"
#include "IsoMemoryAllocatorBase.h"
#include "MarkedBlock.h"
#include <wtf/text/CString.h>
namespace JSC {
IsoMemoryAllocatorBase::IsoMemoryAllocatorBase(CString name)
{
UNUSED_PARAM(name);
}
IsoMemoryAllocatorBase::~IsoMemoryAllocatorBase() = default;
// We need to call this from the derived class's destructor because it's undefined behavior to call pure virtual methods from within a destructor.
void IsoMemoryAllocatorBase::releaseMemoryFromSubclassDestructor()
{
#if !ENABLE(MALLOC_HEAP_BREAKDOWN)
for (unsigned i = 0; i < m_blocks.size(); ++i) {
void* block = m_blocks[i];
if (!m_committed.quickGet(i))
commitBlock(block);
freeBlock(block);
}
#endif
}
void* IsoMemoryAllocatorBase::tryAllocateAlignedMemory(size_t alignment, size_t size)
{
// Since this is designed specially for IsoSubspace, we know that we will only be asked to
// allocate MarkedBlocks.
RELEASE_ASSERT(alignment == MarkedBlock::blockSize);
RELEASE_ASSERT(size == MarkedBlock::blockSize);
Locker locker { m_lock };
m_firstUncommitted = m_committed.findBit(m_firstUncommitted, false);
if (m_firstUncommitted < m_blocks.size()) {
m_committed.quickSet(m_firstUncommitted);
void* result = m_blocks[m_firstUncommitted];
commitBlock(result);
return result;
}
void* result = tryMallocBlock();
if (!result)
return nullptr;
unsigned index = m_blocks.size();
m_blocks.append(result);
m_blockIndices.add(result, index);
if (m_blocks.capacity() != m_committed.size())
m_committed.resize(m_blocks.capacity());
m_committed.quickSet(index);
return result;
}
void IsoMemoryAllocatorBase::freeAlignedMemory(void* basePtr)
{
Locker locker { m_lock };
auto iter = m_blockIndices.find(basePtr);
RELEASE_ASSERT(iter != m_blockIndices.end());
unsigned index = iter->value;
m_committed.quickClear(index);
m_firstUncommitted = std::min(index, m_firstUncommitted);
decommitBlock(basePtr);
}
} // namespace JSC
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