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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_called = 0;
let holdings_list = [];
let cleanup = function (holdings) {
holdings_list.push(holdings);
cleanup_called++;
}
let fg = new FinalizationRegistry(cleanup);
let o1 = {};
let o2 = {};
// Ignition holds references to objects in temporary registers. These will be
// released when the function exits. So only access o inside a function to
// prevent any references to objects in temporary registers when a gc is
(function () {
fg.register(o1, 1);
fg.register(o2, 2);
})();
// Here and below, 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(cleanup_called, 0);
// Drop the last references to o1 and o2.
(function () {
o1 = null;
o2 = null;
})();
// GC will reclaim the target objects; the cleanup function will be called the
// next time we enter the event loop.
await gc({ type: 'major', execution: 'async' });
assertEquals(cleanup_called, 0);
let timeout_func = function () {
assertEquals(cleanup_called, 2);
assertEquals(holdings_list.length, 2);
if (holdings_list[0] == 1) {
assertEquals(holdings_list[1], 2);
} else {
assertEquals(holdings_list[0], 2);
assertEquals(holdings_list[1], 1);
}
}
setTimeout(timeout_func, 0);
})();
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