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// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --expose-gc --noincremental-marking
(async function () {
const r = Realm.create();
const FG = Realm.eval(r, "FinalizationRegistry");
Realm.detachGlobal(r);
const cleanup_not_run = function (holdings) {
assertUnreachable();
}
let fg_not_run = new FG(cleanup_not_run);
(function () {
const object = {};
fg_not_run.register(object, "first");
// Object becomes unreachable.
})();
let cleanedUp = false;
let fg_run;
// Schedule a GC, which will schedule fg_not_run for cleanup.
// Here and below, we need to invoke GC asynchronously and wait for it to
// finish, so that it doesn't need to scan the stack. Otherwise, the objects
// may not be reclaimed because of conservative stack scanning and the test
// may not work as intended.
let task_1_gc = (async function () {
await gc({ type: 'major', execution: 'async' });
// Disposing the realm cancels the already scheduled fg_not_run's finalizer.
Realm.dispose(r);
const cleanup = function (holdings) {
assertEquals(holdings, "second");
assertFalse(cleanedUp);
cleanedUp = true;
}
fg_run = new FG(cleanup);
// FGs that are alive after disposal can still schedule tasks.
(function () {
const object = {};
fg_run.register(object, "second");
// Object becomes unreachable.
})();
})();
// Schedule a second GC for execution after that, which will now schedule
// fg_run for cleanup.
let task_2_gc = (async function () {
await gc({ type: 'major', execution: 'async' });
// Check that the cleanup task has had the chance to run yet.
assertFalse(cleanedUp);
})();
// Wait for the two GCs to be executed.
await task_1_gc;
await task_2_gc;
// Give the cleanup task a chance to run and check it worked correctly.
setTimeout(function () { assertTrue(cleanedUp); }, 0);
})();
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