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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) {
// See which target we're cleaning up and unregister the other one.
if (holdings == 1) {
let success = fg.unregister(key2);
assertTrue(success);
} else {
assertSame(holdings, 2);
let success = fg.unregister(key1);
assertTrue(success);
}
++cleanup_call_count;
}
let fg = new FinalizationRegistry(cleanup);
let key1 = {"k": "first key"};
let key2 = {"k": "second key"};
// Create two objects and register them in the FinalizationRegistry. The objects
// need to be inside a closure so that we can reliably kill them!
(function() {
let object1 = {};
fg.register(object1, 1, key1);
let object2 = {};
fg.register(object2, 2, key2);
// object1 and object2 go out of scope.
})();
// This GC will reclaim target objects 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 and cleaned up one holdings (but not the other one).
let timeout_func = function() {
assertEquals(1, cleanup_call_count);
}
setTimeout(timeout_func, 0);
})();
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