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>
52 lines
1.7 KiB
JavaScript
52 lines
1.7 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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let holdings_list = [];
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let cleanup = function (holdings) {
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assertFalse(cleanup_called);
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holdings_list.push(holdings);
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cleanup_called = true;
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}
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let fg = new FinalizationRegistry(cleanup);
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let o1 = {};
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let holdings = { 'a': 'this is the holdings object' };
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// Ignition holds references to objects in temporary registers. These will be
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// released when the function exits. So only access o inside a function to
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// prevent any references to objects in temporary registers when a gc is
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// triggered.
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(() => { fg.register(o1, holdings); })()
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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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assertFalse(cleanup_called);
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// Drop the last references to o1.
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(() => { o1 = null; })()
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// Drop the last reference to the holdings. The FinalizationRegistry keeps it
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// alive, so the cleanup function will be called as normal.
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holdings = null;
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await gc({ type: 'major', execution: 'async' });
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assertFalse(cleanup_called);
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let timeout_func = function () {
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assertTrue(cleanup_called);
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assertEquals(holdings_list.length, 1);
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assertEquals(holdings_list[0].a, "this is the holdings object");
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}
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setTimeout(timeout_func, 0);
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})();
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