| // 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(holdings_arg) { |
| assertFalse(cleanup_called); |
| assertEquals(holdings_arg, holdings); |
| cleanup_called = true; |
| } |
| |
| let fg = new FinalizationRegistry(cleanup); |
| let o = {}; |
| let holdings = {'h': 55}; |
| |
| // 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 |
| // triggered. |
| (() => { fg.register(o, holdings); })() |
| |
| gc(); |
| assertFalse(cleanup_called); |
| |
| // Drop the last reference to o. |
| (() => { o = null; })() |
| |
| // GC will clear the WeakCell; the cleanup function will be called the next time |
| // we enter the event loop. |
| gc(); |
| assertFalse(cleanup_called); |
| |
| let timeout_func = function() { |
| assertTrue(cleanup_called); |
| } |
| |
| setTimeout(timeout_func, 0); |