mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
/*
|
|
* Copyright (C) 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.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "AllocationFailureMode.h"
|
|
#include "FreeList.h"
|
|
#include "MarkedBlock.h"
|
|
#include <wtf/Noncopyable.h>
|
|
|
|
namespace JSC {
|
|
|
|
class BlockDirectory;
|
|
class GCDeferralContext;
|
|
class Heap;
|
|
|
|
class LocalAllocator : public BasicRawSentinelNode<LocalAllocator> {
|
|
WTF_MAKE_NONCOPYABLE(LocalAllocator);
|
|
|
|
public:
|
|
LocalAllocator(BlockDirectory*);
|
|
~LocalAllocator();
|
|
|
|
void* allocate(Heap&, GCDeferralContext*, AllocationFailureMode);
|
|
|
|
unsigned cellSize() const { return m_freeList.cellSize(); }
|
|
|
|
void stopAllocating();
|
|
void prepareForAllocation();
|
|
void resumeAllocating();
|
|
void stopAllocatingForGood();
|
|
|
|
static ptrdiff_t offsetOfFreeList();
|
|
static ptrdiff_t offsetOfCellSize();
|
|
|
|
bool isFreeListedCell(const void*) const;
|
|
|
|
private:
|
|
friend class BlockDirectory;
|
|
|
|
void reset();
|
|
JS_EXPORT_PRIVATE void* allocateSlowCase(Heap&, GCDeferralContext*, AllocationFailureMode);
|
|
void didConsumeFreeList();
|
|
void* tryAllocateWithoutCollecting();
|
|
void* tryAllocateIn(MarkedBlock::Handle*);
|
|
void* allocateIn(MarkedBlock::Handle*);
|
|
ALWAYS_INLINE void doTestCollectionsIfNeeded(Heap&, GCDeferralContext*);
|
|
|
|
BlockDirectory* m_directory;
|
|
FreeList m_freeList;
|
|
|
|
MarkedBlock::Handle* m_currentBlock { nullptr };
|
|
MarkedBlock::Handle* m_lastActiveBlock { nullptr };
|
|
|
|
// After you do something to a block based on one of these cursors, you clear the bit in the
|
|
// corresponding bitvector and leave the cursor where it was.
|
|
unsigned m_allocationCursor { 0 }; // Points to the next block that is a candidate for allocation.
|
|
};
|
|
|
|
inline ptrdiff_t LocalAllocator::offsetOfFreeList()
|
|
{
|
|
return OBJECT_OFFSETOF(LocalAllocator, m_freeList);
|
|
}
|
|
|
|
inline ptrdiff_t LocalAllocator::offsetOfCellSize()
|
|
{
|
|
return OBJECT_OFFSETOF(LocalAllocator, m_freeList) + FreeList::offsetOfCellSize();
|
|
}
|
|
|
|
} // namespace JSC
|
|
|