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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(holdings_list.length, 1);
assertEquals(holdings_list[0].a, "this is the holdings object");
cleanup_called = true;
}
let fg = new FinalizationRegistry(cleanup);
let o1 = {};
let holdings = {'a': 'this is the holdings object'};
// 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(o1, holdings);})()
gc();
assertFalse(cleanup_called);
// Drop the last references to o1.
(() => {o1 = null;})()
// Drop the last reference to the holdings. The FinalizationRegistry keeps it
// alive, so the cleanup function will be called as normal.
holdings = null;
gc();
assertFalse(cleanup_called);
let timeout_func = function() {
assertTrue(cleanup_called);
}
setTimeout(timeout_func, 0);
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