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>
45 lines
1.5 KiB
JavaScript
45 lines
1.5 KiB
JavaScript
// Copyright 2020 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: --stress-compaction --expose-gc
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(async function () {
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// Test that the dirty FinalizationRegistries that are enqueued during GC have
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// their slots correctly recorded by the GC.
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// 1) Create many JSFinalizationRegistry objects so that they span several pages
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// (page size is 256kb).
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let registries = [];
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for (let i = 0; i < 1024 * 8; i++) {
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registries.push(new FinalizationRegistry(() => { }));
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}
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// 2) Force two GCs to ensure that JSFinalizatonRegistry objects are tenured.
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// Here and below, we need to invoke GC asynchronously and wait for it to
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// finish, so that it doesn't need to scan the stack. Otherwise, the objects
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// may not be reclaimed because of conservative stack scanning and the test
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// may not work as intended.
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await gc({ type: 'major', execution: 'async' });
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await gc({ type: 'major', execution: 'async' });
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// 3) In a function: create a dummy target and register it in all
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// JSFinalizatonRegistry objects.
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(function () {
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let garbage = {};
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registries.forEach((fr) => {
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fr.register(garbage, 42);
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});
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garbage = null;
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})();
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// 4) Outside the function where the target is unreachable: force GC to collect
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// the object.
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await gc({ type: 'major', execution: 'async' });
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// 5) Force another GC to test that the slot was correctly updated.
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await gc({ type: 'major', execution: 'async' });
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})();
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