mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 12:19:46 +00:00
118 lines
4.2 KiB
C++
118 lines
4.2 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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* Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>.
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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. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "WeakMapImpl.h"
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#include "AuxiliaryBarrierInlines.h"
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#include "StructureInlines.h"
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#include "WeakMapImplInlines.h"
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namespace JSC {
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template <typename WeakMapBucket>
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void WeakMapImpl<WeakMapBucket>::destroy(JSCell* cell)
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{
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static_cast<WeakMapImpl*>(cell)->~WeakMapImpl();
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}
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template <typename WeakMapBucket>
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void WeakMapImpl<WeakMapBucket>::visitChildren(JSCell* cell, SlotVisitor& visitor)
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{
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WeakMapImpl* thisObject = jsCast<WeakMapImpl*>(cell);
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ASSERT_GC_OBJECT_INHERITS(thisObject, info());
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Base::visitChildren(thisObject, visitor);
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visitor.reportExtraMemoryVisited(thisObject->m_capacity * sizeof(WeakMapBucket));
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}
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template <typename WeakMapBucket>
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size_t WeakMapImpl<WeakMapBucket>::estimatedSize(JSCell* cell, VM& vm)
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{
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auto* thisObject = static_cast<WeakMapImpl*>(cell);
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return Base::estimatedSize(thisObject, vm) + (sizeof(WeakMapImpl) - sizeof(Base)) + thisObject->m_capacity * sizeof(WeakMapBucket);
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}
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template <>
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void WeakMapImpl<WeakMapBucket<WeakMapBucketDataKey>>::visitOutputConstraints(JSCell*, SlotVisitor&)
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{
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// Only JSWeakMap needs to harvest value references
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}
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template <>
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void WeakMapImpl<WeakMapBucket<WeakMapBucketDataKeyValue>>::visitOutputConstraints(JSCell* cell, SlotVisitor& visitor)
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{
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VM& vm = visitor.vm();
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auto* thisObject = jsCast<WeakMapImpl*>(cell);
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auto locker = holdLock(thisObject->cellLock());
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auto* buffer = thisObject->buffer();
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for (uint32_t index = 0; index < thisObject->m_capacity; ++index) {
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auto* bucket = buffer + index;
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if (bucket->isEmpty() || bucket->isDeleted())
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continue;
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if (!vm.heap.isMarked(bucket->key()))
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continue;
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bucket->visitAggregate(visitor);
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}
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}
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template <typename WeakMapBucket>
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template<typename Appender>
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void WeakMapImpl<WeakMapBucket>::takeSnapshotInternal(unsigned limit, Appender appender)
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{
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DisallowGC disallowGC;
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unsigned fetched = 0;
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forEach([&] (JSObject* key, JSValue value) {
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appender(key, value);
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++fetched;
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if (limit && fetched >= limit)
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return IterationState::Stop;
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return IterationState::Continue;
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});
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}
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// takeSnapshot must not invoke garbage collection since iterating WeakMap may be modified.
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template <>
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void WeakMapImpl<WeakMapBucket<WeakMapBucketDataKey>>::takeSnapshot(MarkedArgumentBuffer& buffer, unsigned limit)
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{
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takeSnapshotInternal(limit, [&] (JSObject* key, JSValue) {
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buffer.append(key);
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});
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}
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template <>
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void WeakMapImpl<WeakMapBucket<WeakMapBucketDataKeyValue>>::takeSnapshot(MarkedArgumentBuffer& buffer, unsigned limit)
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{
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takeSnapshotInternal(limit, [&] (JSObject* key, JSValue value) {
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buffer.append(key);
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buffer.append(value);
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});
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}
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template class WeakMapImpl<WeakMapBucket<WeakMapBucketDataKeyValue>>;
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template class WeakMapImpl<WeakMapBucket<WeakMapBucketDataKey>>;
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} // namespace JSC
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