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/*
* Copyright (C) 2017-2023 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 "IsoSubspace.h"
#include "IsoAlignedMemoryAllocator.h"
#include "IsoCellSetInlines.h"
#include "JSCellInlines.h"
#include "MarkedSpaceInlines.h"
#include <wtf/TZoneMallocInlines.h>
namespace JSC {
WTF_MAKE_TZONE_ALLOCATED_IMPL(IsoSubspace);
IsoSubspace::IsoSubspace(CString name, JSC::Heap& heap, const HeapCellType& heapCellType, size_t size, uint8_t numberOfLowerTierPreciseCells, std::unique_ptr<IsoMemoryAllocatorBase>&& allocator)
: Subspace(SubspaceKind::IsoSubspace, name, heap)
, m_directory(WTF::roundUpToMultipleOf<MarkedBlock::atomSize>(size))
, m_isoAlignedMemoryAllocator(allocator ? WTFMove(allocator) : makeUnique<IsoAlignedMemoryAllocator>(name))
{
m_remainingLowerTierPreciseCount = numberOfLowerTierPreciseCells;
ASSERT(WTF::roundUpToMultipleOf<MarkedBlock::atomSize>(size) == cellSize());
ASSERT(m_remainingLowerTierPreciseCount <= MarkedBlock::maxNumberOfLowerTierPreciseCells);
initialize(heapCellType, m_isoAlignedMemoryAllocator.get());
Locker locker { m_space.directoryLock() };
m_directory.setSubspace(this);
m_space.addBlockDirectory(locker, &m_directory);
m_alignedMemoryAllocator->registerDirectory(heap, &m_directory);
m_firstDirectory = &m_directory;
}
IsoSubspace::~IsoSubspace() = default;
void IsoSubspace::didResizeBits(unsigned blockIndex)
{
m_cellSets.forEach(
[&] (IsoCellSet* set) {
set->didResizeBits(blockIndex);
});
}
void IsoSubspace::didRemoveBlock(unsigned blockIndex)
{
m_cellSets.forEach(
[&] (IsoCellSet* set) {
set->didRemoveBlock(blockIndex);
});
}
void IsoSubspace::didBeginSweepingToFreeList(MarkedBlock::Handle* block)
{
m_cellSets.forEach(
[&] (IsoCellSet* set) {
set->sweepToFreeList(block);
});
}
void* IsoSubspace::tryAllocateLowerTierPrecise(size_t size)
{
auto revive = [&] (PreciseAllocation* allocation) {
// Lower-tier cells never report capacity. This is intentional since it will not be freed until VM dies.
// Whether we will do GC or not does not affect on the used memory by lower-tier cells. So we should not
// count them in capacity since it is not interesting to decide whether we should do GC.
m_preciseAllocations.append(allocation);
m_space.registerPreciseAllocation(allocation, /* isNewAllocation */ false);
ASSERT(allocation->indexInSpace() == m_space.m_preciseAllocations.size() - 1);
return allocation->cell();
};
ASSERT_WITH_MESSAGE(cellSize() == size, "non-preciseOnly IsoSubspaces shouldn't have variable size");
if (!m_lowerTierPreciseFreeList.isEmpty()) {
PreciseAllocation* allocation = &*m_lowerTierPreciseFreeList.begin();
allocation->remove();
return revive(allocation);
}
if (m_remainingLowerTierPreciseCount) {
PreciseAllocation* allocation = PreciseAllocation::tryCreateForLowerTierPrecise(m_space.heap(), size, this, --m_remainingLowerTierPreciseCount);
if (allocation)
return revive(allocation);
}
return nullptr;
}
void IsoSubspace::sweepLowerTierPreciseCell(PreciseAllocation* preciseAllocation)
{
preciseAllocation = preciseAllocation->reuseForLowerTierPrecise();
m_lowerTierPreciseFreeList.append(preciseAllocation);
}
void IsoSubspace::destroyLowerTierPreciseFreeList()
{
m_lowerTierPreciseFreeList.forEach([&](PreciseAllocation* allocation) {
allocation->destroy();
});
}
namespace GCClient {
IsoSubspace::IsoSubspace(JSC::IsoSubspace& server)
: m_localAllocator(&server.m_directory)
{
}
} // namespace GCClient
} // namespace JSC
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