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>
49 lines
1.6 KiB
JavaScript
49 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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let wr;
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let wr_control; // control WeakRef for testing what happens without deref
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(function () {
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let o1 = {};
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wr = new WeakRef(o1);
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let o2 = {};
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wr_control = new WeakRef(o2);
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})();
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let strong = { a: wr.deref(), b: wr_control.deref() };
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// Here and below, we invoke GC synchronously and, with conservative stack
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// scanning, there is a chance that the object is not reclaimed now. In any
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// case, the WeakRefs should not be cleared.
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gc();
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// Next task.
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setTimeout(function() {
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// Call deref inside a closure, trying to avoid accidentally storing a strong
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// reference into the object in the stack frame.
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(function () { wr.deref(); })();
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strong = null;
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// This GC should clear wr_control (modulo CSS), since nothing was keeping it
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// alive, but it should not clear wr.
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gc();
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(function () { assertNotEquals(undefined, wr.deref()); })();
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// Next task.
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(async function () {
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// Trigger GC again to make sure the two WeakRefs are cleared.
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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, wr.deref());
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assertEquals(undefined, wr_control.deref());
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})();
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}, 0);
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