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LibJS: Add the FinalizationRegistry built-in object

As well as the needed functionality in VM to enqueue and run cleanup
jobs for the FinalizationRegistry instances.
This commit is contained in:
Idan Horowitz 2021-06-15 22:16:17 +03:00 committed by Linus Groh
parent 8c7fe8d6c8
commit de9fa6622a
14 changed files with 365 additions and 20 deletions

View file

@ -0,0 +1,48 @@
/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/SinglyLinkedList.h>
#include <LibJS/Runtime/Function.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/WeakContainer.h>
namespace JS {
class FinalizationRegistry final
: public Object
, public WeakContainer {
JS_OBJECT(FinalizationRegistry, Object);
public:
static FinalizationRegistry* create(GlobalObject&, Function&);
explicit FinalizationRegistry(Object& prototype, Function&);
virtual ~FinalizationRegistry() override;
void add_finalization_record(Cell& target, Value held_value, Object* unregister_token);
bool remove_by_token(Object& unregister_token);
void cleanup(Function* callback = nullptr);
virtual void remove_sweeped_cells(Badge<Heap>, Vector<Cell*>&) override;
private:
virtual void visit_edges(Visitor& visitor) override;
Function* m_cleanup_callback { nullptr };
struct FinalizationRecord {
Cell* target { nullptr };
Value held_value;
Object* unregister_token { nullptr };
};
SinglyLinkedList<FinalizationRecord> m_records;
};
}