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/*
* Copyright (C) 2017-2018 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 "config.h"
#include "IsoSubspace.h"
#include "IsoAlignedMemoryAllocator.h"
#include "IsoCellSetInlines.h"
#include "JSCellInlines.h"
#include "MarkedSpaceInlines.h"
namespace JSC {
IsoSubspace::IsoSubspace(CString name, Heap& heap, HeapCellType* heapCellType, size_t size, uint8_t numberOfLowerTierCells)
: Subspace(name, heap)
, m_directory(WTF::roundUpToMultipleOf<MarkedBlock::atomSize>(size))
, m_localAllocator(&m_directory)
, m_isoAlignedMemoryAllocator(makeUnique<IsoAlignedMemoryAllocator>(name))
{
m_remainingLowerTierCellCount = numberOfLowerTierCells;
ASSERT(WTF::roundUpToMultipleOf<MarkedBlock::atomSize>(size) == cellSize());
ASSERT(numberOfLowerTierCells <= MarkedBlock::maxNumberOfLowerTierCells);
m_isIsoSubspace = true;
initialize(heapCellType, m_isoAlignedMemoryAllocator.get());
auto locker = holdLock(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()
{
}
Allocator IsoSubspace::allocatorFor(size_t size, AllocatorForMode mode)
{
return allocatorForNonVirtual(size, mode);
}
void* IsoSubspace::allocate(VM& vm, size_t size, GCDeferralContext* deferralContext, AllocationFailureMode failureMode)
{
return allocateNonVirtual(vm, size, deferralContext, failureMode);
}
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::tryAllocateFromLowerTier()
{
auto revive = [&] (PreciseAllocation* allocation) {
allocation->setIndexInSpace(m_space.m_preciseAllocations.size());
allocation->m_hasValidCell = true;
m_space.m_preciseAllocations.append(allocation);
if (auto* set = m_space.preciseAllocationSet())
set->add(allocation->cell());
ASSERT(allocation->indexInSpace() == m_space.m_preciseAllocations.size() - 1);
m_preciseAllocations.append(allocation);
return allocation->cell();
};
if (!m_lowerTierFreeList.isEmpty()) {
PreciseAllocation* allocation = m_lowerTierFreeList.begin();
allocation->remove();
return revive(allocation);
}
if (m_remainingLowerTierCellCount) {
PreciseAllocation* allocation = PreciseAllocation::createForLowerTier(m_space.heap(), cellSize(), this, --m_remainingLowerTierCellCount);
return revive(allocation);
}
return nullptr;
}
void IsoSubspace::sweepLowerTierCell(PreciseAllocation* preciseAllocation)
{
preciseAllocation = preciseAllocation->reuseForLowerTier();
m_lowerTierFreeList.append(preciseAllocation);
}
void IsoSubspace::destroyLowerTierFreeList()
{
m_lowerTierFreeList.forEach([&](PreciseAllocation* allocation) {
allocation->destroy();
});
}
} // namespace JSC