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// Copyright 2018 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(holdings, "holdings");
// There's one more object with the same key that we haven't
// cleaned up yet so we should be able to unregister the
// callback for that one.
let success = fg.unregister(key);
assertTrue(success);
++cleanup_call_count;
}
let fg = new FinalizationRegistry(cleanup);
// Create an object and register it in the FinalizationRegistry. The object needs to be inside
// a closure so that we can reliably kill them!
let key = {"k": "this is the key"};
(function() {
let object = {};
let object2 = {};
fg.register(object, "holdings", key);
fg.register(object2, "holdings", key);
// object goes out of scope.
})();
// This GC will discover dirty WeakCells and schedule cleanup.
// 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 was called.
let timeout_func = function() {
assertEquals(1, cleanup_call_count);
}
setTimeout(timeout_func, 0);
})();
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