| // Copyright (C) 2019 Leo Balter. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-properties-of-the-finalization-group-constructor |
| description: > |
| The callback function is called with a FinalizationGroupCleanupIterator |
| info: | |
| The %FinalizationGroupCleanupIteratorPrototype% Object |
| |
| - has properties that are inherited by all FinalizationGroup Cleanup Iterator Objects. |
| - is an ordinary object. |
| - has a [[Prototype]] internal slot whose value is the intrinsic object %IteratorPrototype%. |
| ... |
| |
| FinalizationGroup.prototype.cleanupSome ( [ callback ] ) |
| |
| 1. Let finalizationGroup be the this value. |
| 2. If Type(finalizationGroup) is not Object, throw a TypeError exception. |
| 3. If finalizationGroup does not have a [[Cells]] internal slot, throw a TypeError exception. |
| 4. If callback is not undefined and IsCallable(callback) is false, throw a TypeError exception. |
| 5. Perform ! CleanupFinalizationGroup(finalizationGroup, callback). |
| 6. Return undefined. |
| |
| CleanupFinalizationGroup ( finalizationGroup [ , callback ] ) |
| |
| ... |
| 2. If CheckForEmptyCells(finalizationGroup) is false, return. |
| 3. Let iterator be ! CreateFinalizationGroupCleanupIterator(finalizationGroup). |
| 4. If callback is undefined, set callback to finalizationGroup.[[CleanupCallback]]. |
| 5. Set finalizationGroup.[[IsFinalizationGroupCleanupJobActive]] to true. |
| 6. Let result be Call(callback, undefined, « iterator »). |
| ... |
| |
| CheckForEmptyCells ( finalizationGroup ) |
| |
| ... |
| 2. For each cell in finalizationGroup.[[Cells]], do |
| a. If cell.[[Target]] is empty, then |
| i. Return true. |
| 3. Return false. |
| |
| CreateFinalizationGroupCleanupIterator ( finalizationGroup ) |
| |
| ... |
| 4. Let prototype be finalizationGroup.[[Realm]].[[Intrinsics]].[[%FinalizationGroupCleanupIteratorPrototype%]]. |
| 5. Let iterator be ObjectCreate(prototype, « [[FinalizationGroup]] »). |
| 6. Set iterator.[[FinalizationGroup]] to finalizationGroup. |
| 7. Return iterator. |
| features: [FinalizationGroup, host-gc-required] |
| ---*/ |
| |
| var IteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]())); |
| var FinalizationGroupCleanupIteratorPrototype; |
| var called = 0; |
| var cleanupCallbackCalled = 0; |
| |
| function callback(iterator) { |
| called += 1; |
| |
| FinalizationGroupCleanupIteratorPrototype = Object.getPrototypeOf(iterator); |
| } |
| |
| var fg = new FinalizationGroup(function() { |
| cleanupCallbackCalled += 1; |
| }); |
| |
| (function() { |
| let o = {}; |
| fg.register(o); |
| })(); |
| |
| assert.sameValue(called, 0); |
| |
| $262.gc(); |
| fg.cleanupSome(callback); |
| |
| assert.sameValue(called, 1); |
| |
| var proto = Object.getPrototypeOf(FinalizationGroupCleanupIteratorPrototype); |
| assert.sameValue( |
| proto, IteratorPrototype, |
| '[[Prototype]] internal slot whose value is the intrinsic object %IteratorPrototype%' |
| ); |
| |
| |
| assert.sameValue(cleanupCallbackCalled, 0, 'if a callback is given, do not call cleanupCallback'); |