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/*
* Copyright (C) 2025 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 "PreciseSubspace.h"
#include "AllocatingScope.h"
#include "IsoAlignedMemoryAllocator.h"
#include "IsoCellSetInlines.h"
#include "JSCellInlines.h"
#include "MarkedSpaceInlines.h"
#include <wtf/TZoneMallocInlines.h>
namespace JSC {
WTF_MAKE_TZONE_ALLOCATED_IMPL(PreciseSubspace);
PreciseSubspace::PreciseSubspace(CString name, JSC::Heap& heap, const HeapCellType& heapCellType, AlignedMemoryAllocator* allocator)
: Subspace(SubspaceKind::PreciseSubspace, name, heap)
{
initialize(heapCellType, allocator);
}
PreciseSubspace::~PreciseSubspace() = default;
void PreciseSubspace::didResizeBits(unsigned)
{
UNREACHABLE_FOR_PLATFORM();
}
void PreciseSubspace::didRemoveBlock(unsigned)
{
UNREACHABLE_FOR_PLATFORM();
}
void PreciseSubspace::didBeginSweepingToFreeList(MarkedBlock::Handle*)
{
UNREACHABLE_FOR_PLATFORM();
}
void* PreciseSubspace::tryAllocate(size_t size)
{
PreciseAllocation* allocation = PreciseAllocation::tryCreate(m_space.heap(), size, this, 0);
if (!allocation)
return nullptr;
m_preciseAllocations.append(allocation);
m_space.registerPreciseAllocation(allocation, /* isNewAllocation */ true);
return allocation->cell();
}
void* PreciseSubspace::allocate(VM& vm, size_t cellSize, GCDeferralContext* deferralContext, AllocationFailureMode failureMode)
{
ASSERT(vm.currentThreadIsHoldingAPILock());
ASSERT(!vm.heap.objectSpace().isIterating());
UNUSED_PARAM(failureMode);
ASSERT_WITH_MESSAGE(failureMode == AllocationFailureMode::ReturnNull, "PreciseSubspace is meant for large objects so it should always be able to fail.");
AllocatingScope helpingHeap(vm.heap);
vm.heap.collectIfNecessaryOrDefer(deferralContext);
return tryAllocate(cellSize);
}
} // namespace JSC
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