Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibJS/Runtime/FinalizationRegistry.h

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2021-2022, Idan Horowitz <idan.horowitz@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/SinglyLinkedList.h>
+#include <LibJS/Heap/GCPtr.h>
+#include <LibJS/Runtime/FunctionObject.h>
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/JobCallback.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);
+    JS_DECLARE_ALLOCATOR(FinalizationRegistry);
+
+public:
+    virtual ~FinalizationRegistry() override = default;
+
+    void add_finalization_record(Cell& target, Value held_value, Cell* unregister_token);
+    bool remove_by_token(Cell& unregister_token);
+    ThrowCompletionOr<void> cleanup(GCPtr<JobCallback> = {});
+
+    virtual void remove_dead_cells(Badge<Heap>) override;
+
+    Realm& realm() { return *m_realm; }
+    Realm const& realm() const { return *m_realm; }
+
+    JobCallback& cleanup_callback() { return *m_cleanup_callback; }
+    JobCallback const& cleanup_callback() const { return *m_cleanup_callback; }
+
+private:
+    FinalizationRegistry(Realm&, NonnullGCPtr<JobCallback>, Object& prototype);
+
+    virtual void visit_edges(Visitor& visitor) override;
+
+    NonnullGCPtr<Realm> m_realm;
+    NonnullGCPtr<JobCallback> m_cleanup_callback;
+
+    struct FinalizationRecord {
+        GCPtr<Cell> target;
+        Value held_value;
+        GCPtr<Cell> unregister_token;
+    };
+    SinglyLinkedList<FinalizationRecord> m_records;
+};
+
+}