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LibJS: Add Cell::must_survive_garbage_collection() mechanism
This allows cells to prevent themselves from being garbage collected, even when there are no references to them.
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3 changed files with 24 additions and 4 deletions
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/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <AK/Format.h>
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#include <AK/Forward.h>
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#include <AK/Noncopyable.h>
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@ -80,15 +81,25 @@ public:
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// This will be called on unmarked objects by the garbage collector in a separate pass before destruction.
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virtual void finalize() { }
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// This allows cells to survive GC by choice, even if nothing points to them.
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// It's used to implement special rules in the web platform.
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// NOTE: Cells must call set_overrides_must_survive_garbage_collection() for this to be honored.
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virtual bool must_survive_garbage_collection() const { return false; }
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bool overrides_must_survive_garbage_collection(Badge<Heap>) const { return m_overrides_must_survive_garbage_collection; }
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Heap& heap() const;
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VM& vm() const;
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protected:
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Cell() = default;
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void set_overrides_must_survive_garbage_collection(bool b) { m_overrides_must_survive_garbage_collection = b; }
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private:
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bool m_mark : 1 { false };
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State m_state : 7 { State::Live };
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bool m_overrides_must_survive_garbage_collection { false };
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State m_state : 1 { State::Live };
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};
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}
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