| // 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_call_count = 0; |
| let cleanup_holdings_count = 0; |
| let cleanup = function(iter) { |
| for (holdings of iter) { |
| assertEquals(holdings, "holdings"); |
| let success = fg.unregister(key); |
| assertFalse(success); |
| |
| ++cleanup_holdings_count; |
| } |
| ++cleanup_call_count; |
| } |
| |
| let fg = new FinalizationGroup(cleanup); |
| // Create an object and register it in the FinalizationGroup. The object needs to be inside |
| // a closure so that we can reliably kill them! |
| let key = {"k": "this is the key"}; |
| |
| (function() { |
| let object = {}; |
| fg.register(object, "holdings", key); |
| |
| // object goes out of scope. |
| })(); |
| |
| // This GC will discover dirty WeakCells and schedule cleanup. |
| gc(); |
| assertEquals(0, cleanup_call_count); |
| |
| // Assert that the cleanup function was called and iterated the WeakCell. |
| let timeout_func = function() { |
| assertEquals(1, cleanup_call_count); |
| assertEquals(1, cleanup_holdings_count); |
| } |
| |
| setTimeout(timeout_func, 0); |
