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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.
*/
#pragma once
#include "Subspace.h"
#include "SubspaceAccess.h"
namespace JSC {
// Unlike other Subspaces, PreciseSubspace doesn't support LocalAllocators as it's meant for large, rarely allocated objects
// that wouldn't be profitable to allocate directly in JIT code.
class PreciseSubspace : public Subspace {
WTF_MAKE_TZONE_ALLOCATED_EXPORT(PreciseSubspace, JS_EXPORT_PRIVATE);
public:
JS_EXPORT_PRIVATE PreciseSubspace(CString name, Heap&, const HeapCellType&, AlignedMemoryAllocator*);
JS_EXPORT_PRIVATE ~PreciseSubspace() override;
void* tryAllocate(size_t cellSize);
void* allocate(VM&, size_t, GCDeferralContext*, AllocationFailureMode);
private:
void didResizeBits(unsigned newSize) override;
void didRemoveBlock(unsigned blockIndex) override;
void didBeginSweepingToFreeList(MarkedBlock::Handle*) override;
};
namespace GCClient {
// This doesn't do anything interesting right now but we keep the GCClient namespace for consistency/templates.
using PreciseSubspace = JSC::PreciseSubspace;
}
} // namespace JSC
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