e992a9f469
This is a continuation of the previous three commits. Now that create() receives the allocating realm, we can simply forward that to allocate(), which accounts for the majority of these changes. Additionally, we can get rid of the realm_from_global_object() in one place, with one more remaining in VM::throw_completion().
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/*
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* Copyright (c) 2021-2022, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/WeakRef.h>
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namespace JS {
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WeakRef* WeakRef::create(Realm& realm, Object& value)
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{
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return realm.heap().allocate<WeakRef>(realm, value, *realm.global_object().weak_ref_prototype());
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}
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WeakRef* WeakRef::create(Realm& realm, Symbol& value)
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{
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return realm.heap().allocate<WeakRef>(realm, value, *realm.global_object().weak_ref_prototype());
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}
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WeakRef::WeakRef(Object& value, Object& prototype)
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: Object(prototype)
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, WeakContainer(heap())
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, m_value(&value)
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, m_last_execution_generation(vm().execution_generation())
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{
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}
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WeakRef::WeakRef(Symbol& value, Object& prototype)
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: Object(prototype)
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, WeakContainer(heap())
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, m_value(&value)
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, m_last_execution_generation(vm().execution_generation())
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{
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}
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void WeakRef::remove_dead_cells(Badge<Heap>)
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{
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if (m_value.visit([](Cell* cell) -> bool { return cell->state() == Cell::State::Live; }, [](Empty) -> bool { VERIFY_NOT_REACHED(); }))
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return;
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m_value = Empty {};
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// This is an optimization, we deregister from the garbage collector early (even if we were not garbage collected ourself yet)
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// to reduce the garbage collection overhead, which we can do because a cleared weak ref cannot be reused.
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WeakContainer::deregister();
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}
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void WeakRef::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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if (vm().execution_generation() == m_last_execution_generation) {
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auto* cell = m_value.visit([](Cell* cell) -> Cell* { return cell; }, [](Empty) -> Cell* { return nullptr; });
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visitor.visit(cell);
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}
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}
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}
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