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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: --harmony-weak-refs --expose-gc --noincremental-marking
let cleanup_called = false;
let cleanup = function(iter) {
assertFalse(cleanup_called);
let holdings_list = [];
for (holdings of iter) {
holdings_list.push(holdings);
}
assertEquals(1, holdings_list.length);
assertEquals("holdings", holdings_list[0]);
cleanup_called = true;
}
let fg = new FinalizationRegistry(cleanup);
let weak_ref;
(function() {
let o = {};
weak_ref = new WeakRef(o);
fg.register(o, "holdings");
})();
// Since the WeakRef was created during this turn, it is not cleared by GC. The
// pointer inside the FinalizationRegistry is not cleared either, since the WeakRef
// keeps the target object alive.
gc();
(function() {
assertNotEquals(undefined, weak_ref.deref());
})();
// Trigger gc in next task
setTimeout(() => {
gc();
// Check that cleanup callback was called in a follow up task
setTimeout(() => {
assertTrue(cleanup_called);
assertEquals(undefined, weak_ref.deref());
}, 0);
}, 0);
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