51 lines
1.5 KiB
JavaScript
51 lines
1.5 KiB
JavaScript
// 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) {
|
|
++cleanup_call_count;
|
|
}
|
|
|
|
let fg = new FinalizationRegistry(cleanup);
|
|
let key = { "k": "this is the key" };
|
|
// Create an object and register it in the FinalizationRegistry. The object needs
|
|
// to be inside a closure so that we can reliably kill them!
|
|
|
|
(function () {
|
|
let object = {};
|
|
fg.register(object, "holdings", key);
|
|
|
|
// Unregister before the GC has a chance to discover the object.
|
|
let success = fg.unregister(key);
|
|
assertTrue(success);
|
|
|
|
// Call unregister again (just to assert we handle this gracefully).
|
|
success = fg.unregister(key);
|
|
assertFalse(success);
|
|
|
|
// object goes out of scope.
|
|
})();
|
|
|
|
// This GC will reclaim the target object.
|
|
// 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 won't be called, since the weak reference
|
|
// was unregistered.
|
|
let timeout_func = function () {
|
|
assertEquals(0, cleanup_call_count);
|
|
}
|
|
|
|
setTimeout(timeout_func, 0);
|
|
|
|
})();
|