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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 --allow-natives-syntax
let cleanup_count = 0;
let cleanup_holdings = [];
let cleanup = function(iter) {
for (holdings of iter) {
cleanup_holdings.push(holdings);
}
++cleanup_count;
}
let fg = new FinalizationGroup(cleanup);
(function() {
let o = {};
fg.register(o, "holdings");
assertEquals(0, cleanup_count);
})();
// GC will detect o as dead.
gc();
// passing no callback, should trigger cleanup function
fg.cleanupSome();
assertEquals(1, cleanup_count);
assertEquals(1, cleanup_holdings.length);
assertEquals("holdings", cleanup_holdings[0]);
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