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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_call_count = 0;
let cleanup = function(iter) {
print("in cleanup");
if (cleanup_call_count == 0) {
// First call: iterate 2 of the 3 holdings
let holdings_list = [];
for (holdings of iter) {
holdings_list.push(holdings);
// Don't iterate the rest of the holdings
if (holdings_list.length == 2) {
break;
}
}
assertEquals(holdings_list.length, 2);
assertTrue(holdings_list[0] < 3);
assertTrue(holdings_list[1] < 3);
// Update call count only after the asserts; this ensures that the test
// fails even if the exceptions inside the cleanup function are swallowed.
cleanup_call_count++;
} else {
// Second call: iterate one leftover holdings and one holdings.
assertEquals(1, cleanup_call_count);
let holdings_list = [];
for (holdings of iter) {
holdings_list.push(holdings);
}
assertEquals(holdings_list.length, 2);
assertTrue((holdings_list[0] < 3 && holdings_list[1] == 100) ||
(holdings_list[1] < 3 && holdings_list[0] == 100));
// Update call count only after the asserts; this ensures that the test
// fails even if the exceptions inside the cleanup function are swallowed.
cleanup_call_count++;
}
}
let fg = new FinalizationRegistry(cleanup);
// Create 3 objects and register them in the FinalizationRegistry. The objects need
// to be inside a closure so that we can reliably kill them!
(function() {
let objects = [];
for (let i = 0; i < 3; ++i) {
objects[i] = {a: i};
fg.register(objects[i], i);
}
gc();
assertEquals(0, cleanup_call_count);
// Drop the references to the objects.
objects = [];
})();
// This GC will reclaim the targets.
gc();
assertEquals(0, cleanup_call_count);
let timeout_func_1 = function() {
assertEquals(1, cleanup_call_count);
// Assert that the cleanup function won't be called unless new targets appear.
setTimeout(timeout_func_2, 0);
}
setTimeout(timeout_func_1, 0);
let timeout_func_2 = function() {
assertEquals(1, cleanup_call_count);
// Create a new object and register it.
(function() {
let obj = {};
let wc = fg.register(obj, 100);
obj = null;
})();
// This GC will reclaim the targets.
gc();
assertEquals(1, cleanup_call_count);
setTimeout(timeout_func_3, 0);
}
let timeout_func_3 = function() {
assertEquals(2, cleanup_call_count);
}
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