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Bug 1642685 - Add WeakRef and FinalizationRegistry tests involving DOM objects r=smaug

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Differential Revision: https://phabricator.services.mozilla.com/D77798
This commit is contained in:
Jon Coppeard 2020-06-03 09:19:59 +00:00
parent 72b60beac6
commit 1fa83d8c9b
2 changed files with 140 additions and 47 deletions
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111
js/xpconnect/tests/mochitest/test_finalizationRegistry.html
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@ -5,43 +5,72 @@
<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.
let holdings1 = [];
let registry1 = new FinalizationRegistry(v => { holdings1.push(v); });
holdings1 = [];
registry1 = new FinalizationRegistry(v => { holdings1.push(v); });
// Registry with three registered objects.
let holdings2 = [];
let registry2 = new FinalizationRegistry(v => { holdings2.push(v); });
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.
let holdings3 = [];
let registry3 = new FinalizationRegistry(v => { holdings3.push(v); });
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.
let holdings4 = [];
let registry4 = new FinalizationRegistry(v => { holdings4.push(v); });
holdings4 = [];
registry4 = new FinalizationRegistry(v => { holdings4.push(v); });
registry4.register(object4, 1);
// Registry observing cyclic JS data structure.
let holdings5 = [];
let registry5 = new FinalizationRegistry(v => { holdings5.push(v); });
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.
let holdings6 = [];
let registry6 = new FinalizationRegistry(v => { holdings6.push(v); });
registry6.register(makeDOMCycle(4), 6);
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.
@ -57,29 +86,55 @@
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(() => {
is(holdings1.length, 0);
setTimeout(task2, 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);
function task2() {
is(holdings1.length, 0);
is(holdings3.length, 0);
is(holdings4.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(holdings5.length, 1);
is(holdings5[0], 5);
is(holdings3.length, 0);
is(holdings4.length, 0);
is(holdings6.length, 1);
is(holdings6[0], 6);
is(holdings5.length, 1);
is(holdings5[0], 5);
SimpleTest.finish();
}, 0);
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) {

76
js/xpconnect/tests/mochitest/test_weakRefs.html
View File

@ -5,36 +5,74 @@
<title>Test WeakRef works in the browser</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="application/javascript">
let wr1, wr2, wr3, wr4;
function go() {
SimpleTest.waitForExplicitFinish();
let wr;
{
let obj = {};
wr = new WeakRef(obj);
obj = null;
}
// 1. WeakRef with JS target.
wr1 = new WeakRef({});
// 2. WeakRef with DOM object target (without preserved wrapper).
wr2 = new WeakRef(document.createElement("div"));
// 3. WeakRef with DOM object target (with preserved wrapper).
let object = document.createElement("div");
object.someProperty = true;
wr3 = new WeakRef(object);
object = null
// 4. WeakRef with reachable DOM object target without preserved wrapper.
document.body.appendChild(document.createElement("div"));
wr4 = new WeakRef(document.body.lastChild);
// WeakRef should keep the target in the current task.
isnot(wr.deref(), undefined, "deref() should return its target.");
isnot(wr1.deref(), undefined, "deref() should return its target.");
isnot(wr2.deref(), undefined, "deref() should return its target.");
isnot(wr3.deref(), undefined, "deref() should return its target.");
isnot(wr4.deref(), undefined, "deref() should return its target.");
// Weakref should keep the target until the end of current Job, that
// includes microtask(Promise).
// WeakRef should keep the target until the end of current task, which
// includes promise microtasks.
Promise.resolve().then(() => {
isnot(wr.deref(), undefined,
"deref() should return its target in promise");
isnot(wr1.deref(), undefined, "deref() should return its target.");
isnot(wr2.deref(), undefined, "deref() should return its target.");
isnot(wr3.deref(), undefined, "deref() should return its target.");
isnot(wr4.deref(), undefined, "deref() should return its target.");
});
// setTimeout will launch a new job and call ClearKeptObjects().
setTimeout(() => {
// Call gc() forcibly to clear the target of wr.
SpecialPowers.DOMWindowUtils.garbageCollect();
// setTimeout will call its callback in a new task.
setTimeout(task2, 0);
}
is(wr.deref(), undefined, "deref() should return undefined in the new job.");
function task2() {
// Trigger a full GC/CC/GC cycle to collect WeakRef targets.
SpecialPowers.DOMWindowUtils.garbageCollect();
SpecialPowers.DOMWindowUtils.cycleCollect();
SpecialPowers.DOMWindowUtils.garbageCollect();
SimpleTest.finish();
}, 0);
is(wr1.deref(), undefined, "deref() should return undefined.");
is(wr2.deref(), undefined, "deref() should return undefined.");
is(wr3.deref(), undefined, "deref() should return undefined.");
isnot(wr4.deref(), undefined, "deref() should return its target.");
// setTimeout will call its callback in a new task.
setTimeout(task3, 0);
}
function task3() {
document.body.removeChild(document.body.lastChild);
SpecialPowers.DOMWindowUtils.garbageCollect();
SpecialPowers.DOMWindowUtils.cycleCollect();
SpecialPowers.DOMWindowUtils.garbageCollect();
is(wr1.deref(), undefined, "deref() should return undefined.");
is(wr2.deref(), undefined, "deref() should return undefined.");
is(wr3.deref(), undefined, "deref() should return undefined.");
is(wr4.deref(), undefined, "deref() should return undefined.");
SimpleTest.finish();
}
</script>
</head>