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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Test FinalizationRegistry works in the browser</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="application/javascript">
let registry1, holdings1;
let registry2, holdings2;
let registry3, holdings3;
let registry4, holdings4;
let registry5, holdings5;
let registry6, holdings6;
let registry7, holdings7;
let registry8, holdings8;
let registry9, holdings9;
let object4 = {};
function go() {
SimpleTest.waitForExplicitFinish();
// Registry with no registered objects.
holdings1 = [];
registry1 = new FinalizationRegistry(v => { holdings1.push(v); });
// Registry with three registered objects.
holdings2 = [];
registry2 = new FinalizationRegistry(v => { holdings2.push(v); });
registry2.register({}, 1);
registry2.register({}, 2);
registry2.register({}, 3);
// Registry with registered object that is then unregistered.
holdings3 = [];
registry3 = new FinalizationRegistry(v => { holdings3.push(v); });
let token3 = {}
registry3.register({}, 1, token3);
registry3.unregister(token3);
// Registry with registered object that doesn't die.
holdings4 = [];
registry4 = new FinalizationRegistry(v => { holdings4.push(v); });
registry4.register(object4, 1);
// Registry observing cyclic JS data structure.
holdings5 = [];
registry5 = new FinalizationRegistry(v => { holdings5.push(v); });
registry5.register(makeJSCycle(4), 5);
// Registry observing DOM object without preserved wrappers.
holdings6 = [];
registry6 = new FinalizationRegistry(v => { holdings6.push(v); });
registry6.register(document.createElement("div"), 6);
// Registry observing DOM object with preserved wrappers.
holdings7 = [];
registry7 = new FinalizationRegistry(v => { holdings7.push(v); });
let object = document.createElement("div");
object.someProperty = true;
registry7.register(object, 7);
object = null;
// Registry observing reachable DOM object without preserved wrappers.
holdings8 = [];
registry8 = new FinalizationRegistry(v => { holdings8.push(v); });
document.body.appendChild(document.createElement("div"));
registry8.register(document.body.lastChild, 8);
// Registry observing cyclic DOM/JS data structure.
holdings9 = [];
registry9 = new FinalizationRegistry(v => { holdings9.push(v); });
registry9.register(makeDOMCycle(4), 9);
// Need to run full GC/CC/GC cycle to collect cyclic garbage through DOM
// and JS heaps.
SpecialPowers.DOMWindowUtils.garbageCollect();
SpecialPowers.DOMWindowUtils.cycleCollect();
SpecialPowers.DOMWindowUtils.garbageCollect();
// Microtasks are run before cleanup callbacks.
Promise.resolve().then(() => {
is(holdings1.length, 0);
is(holdings2.length, 0);
is(holdings3.length, 0);
is(holdings4.length, 0);
is(holdings5.length, 0);
is(holdings6.length, 0);
is(holdings7.length, 0);
is(holdings8.length, 0);
is(holdings9.length, 0);
});
// setTimeout queues a task which will run after cleanup callbacks.
setTimeout(task2, 0);
}
function task2() {
is(holdings1.length, 0);
let result = holdings2.sort((a, b) => a - b);
is(result.length, 3);
is(result[0], 1);
is(result[1], 2);
is(result[2], 3);
is(holdings3.length, 0);
is(holdings4.length, 0);
is(holdings5.length, 1);
is(holdings5[0], 5);
is(holdings6.length, 1);
is(holdings6[0], 6);
is(holdings7.length, 1);
is(holdings7[0], 7);
is(holdings8.length, 0);
is(holdings9.length, 1);
is(holdings9[0], 9);
document.body.removeChild(document.body.lastChild);
SpecialPowers.DOMWindowUtils.garbageCollect();
SpecialPowers.DOMWindowUtils.cycleCollect();
SpecialPowers.DOMWindowUtils.garbageCollect();
setTimeout(task3, 0);
}
function task3() {
is(holdings8.length, 1);
is(holdings8[0], 8);
SimpleTest.finish();
}
function makeJSCycle(size) {
let first = {};
let current = first;
for (let i = 0; i < size; i++) {
current.next = {};
current = current.next;
}
current.next = first;
return first;
}
function makeDOMCycle(size) {
let first = {};
let current = first;
for (let i = 0; i < size; i++) {
if (i % 2 === 0) {
current.next = document.createElement("div");
} else {
current.next = {};
}
current = current.next;
}
current.next = first;
return first;
}
</script>
</head>
<body onload="go()"></body>
</html>
|
