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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 "IsoCellSet.h"
#include "MarkedBlockInlines.h"
namespace JSC {
IsoCellSet::IsoCellSet(IsoSubspace& subspace)
: m_subspace(subspace)
{
ASSERT_WITH_MESSAGE(!subspace.isPreciseOnly(), "IsoSubspaces with precise-only allocations are not supported by IsoCellSet");
size_t size = subspace.m_directory.m_blocks.size();
m_blocksWithBits.resize(size);
m_bits.grow(size);
subspace.m_cellSets.append(this);
}
IsoCellSet::~IsoCellSet()
{
if (isOnList())
BasicRawSentinelNode<IsoCellSet>::remove();
}
Ref<SharedTask<MarkedBlock::Handle*()>> IsoCellSet::parallelNotEmptyMarkedBlockSource()
{
class Task final : public SharedTask<MarkedBlock::Handle*()> {
public:
Task(IsoCellSet& set)
: m_set(set)
, m_directory(set.m_subspace.m_directory)
{
}
MarkedBlock::Handle* run() final
{
if (m_done)
return nullptr;
m_directory.assertIsMutatorOrMutatorIsStopped();
Locker locker { m_lock };
auto bits = m_directory.markingNotEmptyBitsView() & m_set.m_blocksWithBits;
m_index = bits.findBit(m_index, true);
if (m_index >= m_directory.m_blocks.size()) {
m_done = true;
return nullptr;
}
return m_directory.m_blocks[m_index++];
}
private:
IsoCellSet& m_set;
BlockDirectory& m_directory;
size_t m_index { 0 };
Lock m_lock;
bool m_done { false };
};
return adoptRef(*new Task(*this));
}
NEVER_INLINE WTF::BitSet<MarkedBlock::atomsPerBlock>* IsoCellSet::addSlow(unsigned blockIndex)
{
Locker locker { m_subspace.m_directory.m_bitvectorLock };
auto& bitsPtrRef = m_bits[blockIndex];
auto* bits = bitsPtrRef.get();
if (!bits) {
bitsPtrRef = makeUnique<WTF::BitSet<MarkedBlock::atomsPerBlock>>();
bits = bitsPtrRef.get();
WTF::storeStoreFence();
m_blocksWithBits[blockIndex] = true;
}
return bits;
}
void IsoCellSet::didResizeBits(unsigned newSize)
{
m_blocksWithBits.resize(newSize);
m_bits.grow(newSize);
}
void IsoCellSet::didRemoveBlock(unsigned blockIndex)
{
{
Locker locker { m_subspace.m_directory.m_bitvectorLock };
m_blocksWithBits[blockIndex] = false;
}
m_bits[blockIndex] = nullptr;
}
void IsoCellSet::sweepToFreeList(MarkedBlock::Handle* block)
{
RELEASE_ASSERT(!block->isAllocated());
if (!m_blocksWithBits[block->index()])
return;
WTF::loadLoadFence();
if (!m_bits[block->index()]) {
dataLog("FATAL: for block index ", block->index(), ":\n");
dataLog("Blocks with bits says: ", !!m_blocksWithBits[block->index()], "\n");
dataLog("Bits says: ", RawPointer(m_bits[block->index()].get()), "\n");
RELEASE_ASSERT_NOT_REACHED();
}
if (block->block().hasAnyNewlyAllocated()) {
// The newlyAllocated() bits are a superset of the marks() bits.
m_bits[block->index()]->concurrentFilter(block->block().newlyAllocated());
return;
}
if (block->isEmpty() || block->areMarksStaleForSweep()) {
{
// Holding the bitvector lock happens to be enough because that's what we also hold in
// other places where we manipulate this bitvector.
Locker locker { m_subspace.m_directory.m_bitvectorLock };
m_blocksWithBits[block->index()] = false;
}
m_bits[block->index()] = nullptr;
return;
}
m_bits[block->index()]->concurrentFilter(block->block().marks());
}
} // namespace JSC
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