55 lines
1.6 KiB
JavaScript
55 lines
1.6 KiB
JavaScript
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// Copyright 2019 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_call_count = 0;
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let cleanup = function(holdings) {
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assertEquals("holdings2", holdings);
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++cleanup_call_count;
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}
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let fg = new FinalizationRegistry(cleanup);
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let key1 = {"k": "key1"};
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let key2 = {"k": "key2"};
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// Create three objects and register them in the FinalizationRegistry. The objects
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// need to be inside a closure so that we can reliably kill them!
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(function() {
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let object1a = {};
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fg.register(object1a, "holdings1a", key1);
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let object1b = {};
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fg.register(object1b, "holdings1b", key1);
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let object2 = {};
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fg.register(object2, "holdings2", key2);
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// Unregister before the GC has a chance to discover the objects.
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let success = fg.unregister(key1);
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assertTrue(success);
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// objects go out of scope.
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})();
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// This GC will reclaim the target objects.
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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(0, cleanup_call_count);
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// Assert that the cleanup function will be called only for the reference which
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// was not unregistered.
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let timeout_func = function() {
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assertEquals(1, cleanup_call_count);
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}
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setTimeout(timeout_func, 0);
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})();
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