f226350fcb
PR-URL: https://github.com/nodejs/node/pull/47251 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>
50 lines
1.6 KiB
JavaScript
50 lines
1.6 KiB
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --expose-gc --noincremental-marking
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(async function () {
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let cleanup_called = false;
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const cleanup = function(holdings) {
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assertFalse(cleanup_called);
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assertEquals("holdings", holdings);
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cleanup_called = true;
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}
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const fg = new FinalizationRegistry(cleanup);
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let weak_ref;
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(function() {
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const o = {};
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weak_ref = new WeakRef(o);
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fg.register(o, "holdings");
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})();
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// Since the WeakRef was created during this turn, it is not cleared by GC. The
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// pointer inside the FinalizationRegistry is not cleared either, since the WeakRef
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// keeps the target object alive.
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// Here we invoke GC synchronously and, with conservative stack scanning, there is
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// a chance that the object is not reclaimed now. In any case, the WeakRef should
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// not be cleared.
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gc();
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assertNotEquals(undefined, weak_ref.deref());
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assertFalse(cleanup_called);
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// Trigger GC in next task. Now the WeakRef is cleared but the cleanup has
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// not been called yet.
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// We need to invoke GC asynchronously and wait for it to finish, so that
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// it doesn't need to scan the stack. Otherwise, the objects may not be
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// reclaimed because of conservative stack scanning and the test may not
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// work as intended.
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await gc({ type: 'major', execution: 'async' });
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assertEquals(undefined, weak_ref.deref());
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assertFalse(cleanup_called);
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// Check that the cleanup callback was called in a follow up task.
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setTimeout(() => { assertTrue(cleanup_called); }, 0);
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})();
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