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// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --expose-gc --noincremental-marking
(async function () {
let cleanup_call_count = 0;
let cleanup = function(holdings) {
assertEquals("holdings2", holdings);
++cleanup_call_count;
}
let fg = new FinalizationRegistry(cleanup);
let key1 = {"k": "key1"};
let key2 = {"k": "key2"};
// Create three objects and register them in the FinalizationRegistry. The objects
// need to be inside a closure so that we can reliably kill them!
(function() {
let object1a = {};
fg.register(object1a, "holdings1a", key1);
let object1b = {};
fg.register(object1b, "holdings1b", key1);
let object2 = {};
fg.register(object2, "holdings2", key2);
// Unregister before the GC has a chance to discover the objects.
let success = fg.unregister(key1);
assertTrue(success);
// objects go out of scope.
})();
// This GC will reclaim the target objects.
// We need to invoke GC asynchronously and wait for it to finish, so that
// it doesn't need to scan the stack. Otherwise, the objects may not be
// reclaimed because of conservative stack scanning and the test may not
// work as intended.
await gc({ type: 'major', execution: 'async' });
assertEquals(0, cleanup_call_count);
// Assert that the cleanup function will be called only for the reference which
// was not unregistered.
let timeout_func = function() {
assertEquals(1, cleanup_call_count);
}
setTimeout(timeout_func, 0);
})();
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