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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 "Subspace.h"
#include "AlignedMemoryAllocator.h"
#include "BlockDirectoryInlines.h"
#include "HeapCellType.h"
#include "JSCInlines.h"
#include "MarkedBlockInlines.h"
#include "ParallelSourceAdapter.h"
#include "PreventCollectionScope.h"
#include "SubspaceInlines.h"
namespace JSC {
Subspace::Subspace(CString name, Heap& heap)
: m_space(heap.objectSpace())
, m_name(name)
{
}
void Subspace::initialize(HeapCellType* heapCellType, AlignedMemoryAllocator* alignedMemoryAllocator)
{
m_attributes = heapCellType->attributes();
m_heapCellType = heapCellType;
m_alignedMemoryAllocator = alignedMemoryAllocator;
m_directoryForEmptyAllocation = m_alignedMemoryAllocator->firstDirectory();
Heap& heap = *m_space.heap();
PreventCollectionScope preventCollectionScope(heap);
heap.objectSpace().m_subspaces.append(this);
m_alignedMemoryAllocator->registerSubspace(this);
}
Subspace::~Subspace()
{
}
void Subspace::finishSweep(MarkedBlock::Handle& block, FreeList* freeList)
{
m_heapCellType->finishSweep(block, freeList);
}
void Subspace::destroy(VM& vm, JSCell* cell)
{
m_heapCellType->destroy(vm, cell);
}
void Subspace::prepareForAllocation()
{
forEachDirectory(
[&] (BlockDirectory& directory) {
directory.prepareForAllocation();
});
m_directoryForEmptyAllocation = m_alignedMemoryAllocator->firstDirectory();
}
MarkedBlock::Handle* Subspace::findEmptyBlockToSteal()
{
for (; m_directoryForEmptyAllocation; m_directoryForEmptyAllocation = m_directoryForEmptyAllocation->nextDirectoryInAlignedMemoryAllocator()) {
if (MarkedBlock::Handle* block = m_directoryForEmptyAllocation->findEmptyBlockToSteal())
return block;
}
return nullptr;
}
RefPtr<SharedTask<BlockDirectory*()>> Subspace::parallelDirectorySource()
{
class Task : public SharedTask<BlockDirectory*()> {
public:
Task(BlockDirectory* directory)
: m_directory(directory)
{
}
BlockDirectory* run() override
{
auto locker = holdLock(m_lock);
BlockDirectory* result = m_directory;
if (result)
m_directory = result->nextDirectoryInSubspace();
return result;
}
private:
BlockDirectory* m_directory;
Lock m_lock;
};
return adoptRef(new Task(m_firstDirectory));
}
RefPtr<SharedTask<MarkedBlock::Handle*()>> Subspace::parallelNotEmptyMarkedBlockSource()
{
return createParallelSourceAdapter<BlockDirectory*, MarkedBlock::Handle*>(
parallelDirectorySource(),
[] (BlockDirectory* directory) -> RefPtr<SharedTask<MarkedBlock::Handle*()>> {
if (!directory)
return nullptr;
return directory->parallelNotEmptyBlockSource();
});
}
void Subspace::sweep()
{
forEachDirectory(
[&] (BlockDirectory& directory) {
directory.sweep();
});
}
void Subspace::didResizeBits(size_t)
{
}
void Subspace::didRemoveBlock(size_t)
{
}
void Subspace::didBeginSweepingToFreeList(MarkedBlock::Handle*)
{
}
} // namespace JSC