mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
136 lines
3.7 KiB
C++
136 lines
3.7 KiB
C++
/*
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* Copyright (C) 2012-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "CellContainer.h"
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#include "WeakBlock.h"
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#include <wtf/SentinelLinkedList.h>
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namespace JSC {
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class Heap;
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class WeakImpl;
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class WeakSet : public BasicRawSentinelNode<WeakSet> {
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friend class LLIntOffsetsExtractor;
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public:
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static WeakImpl* allocate(JSValue, WeakHandleOwner* = nullptr, void* context = nullptr);
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static void deallocate(WeakImpl*);
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WeakSet(VM&);
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~WeakSet();
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void lastChanceToFinalize();
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Heap* heap() const;
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VM& vm() const;
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bool isEmpty() const;
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bool isTriviallyDestructible() const;
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void visit(SlotVisitor&);
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void reap();
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void sweep();
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void shrink();
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void resetAllocator();
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static ptrdiff_t offsetOfVM() { return OBJECT_OFFSETOF(WeakSet, m_vm); }
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private:
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JS_EXPORT_PRIVATE WeakBlock::FreeCell* findAllocator(CellContainer);
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WeakBlock::FreeCell* tryFindAllocator();
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WeakBlock::FreeCell* addAllocator(CellContainer);
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void removeAllocator(WeakBlock*);
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WeakBlock::FreeCell* m_allocator { nullptr };
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WeakBlock* m_nextAllocator { nullptr };
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DoublyLinkedList<WeakBlock> m_blocks;
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// m_vm must be a pointer (instead of a reference) because the JSCLLIntOffsetsExtractor
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// cannot handle it being a reference.
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VM* m_vm;
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};
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inline WeakSet::WeakSet(VM& vm)
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: m_vm(&vm)
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{
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}
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inline VM& WeakSet::vm() const
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{
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return *m_vm;
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}
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inline bool WeakSet::isEmpty() const
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{
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for (WeakBlock* block = m_blocks.head(); block; block = block->next()) {
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if (!block->isEmpty())
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return false;
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}
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return true;
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}
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inline bool WeakSet::isTriviallyDestructible() const
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{
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if (!m_blocks.isEmpty())
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return false;
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if (isOnList())
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return false;
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return true;
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}
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inline void WeakSet::deallocate(WeakImpl* weakImpl)
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{
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weakImpl->setState(WeakImpl::Deallocated);
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}
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inline void WeakSet::lastChanceToFinalize()
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{
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for (WeakBlock* block = m_blocks.head(); block; block = block->next())
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block->lastChanceToFinalize();
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}
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inline void WeakSet::visit(SlotVisitor& visitor)
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{
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for (WeakBlock* block = m_blocks.head(); block; block = block->next())
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block->visit(visitor);
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}
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inline void WeakSet::reap()
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{
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for (WeakBlock* block = m_blocks.head(); block; block = block->next())
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block->reap();
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}
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inline void WeakSet::resetAllocator()
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{
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m_allocator = nullptr;
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m_nextAllocator = m_blocks.head();
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}
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} // namespace JSC
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