<!
DOCTYPE HTML>
<
html>
<
head>
<
meta charset=
"utf-8">
<
title>Test for cycle collection of event handlers</
title>
<
script src=
"/tests/SimpleTest/SimpleTest.js"></
script>
<
link rel=
"stylesheet" href=
"/tests/SimpleTest/test.css"/>
<
script>
SimpleTest.waitForExplicitFinish();
function listener() {}
function make_weak_ref(obj) {
let m = new WeakMap;
m.set(obj, {});
return m;
}
function weak_ref_dead(r) {
return !SpecialPowers.nondeterministicGetWeakMapKeys(r).length;
}
function setupTarget1() {
let ifr = document.getElementById(
"target1");
let doc = ifr.contentDocument;
let b = doc.createElement(
"button");
doc.
body.appendChild(b);
b.onclick = listener;
ifr.remove();
return make_weak_ref(b);
}
function setupTarget2() {
let ifr = document.getElementById(
"target2");
let doc = ifr.contentDocument;
let b = doc.createElement(
"button");
doc.
body.appendChild(b);
let setFunc = new ifr.contentWindow.Function(`
var b = document.querySelector(
"button");
var proto = parent.HTMLElement.prototype;
var setter =
Object.getOwnPropertyDescriptor(proto,
"onclick").set;
// Here the current global (and hence CallbackObject global) will be
// the parent, the callback will be a known-live thing from the
// parent, but the incumbent global will be the child.
setter.call(b, parent.listener);
`);
setFunc();
ifr.remove();
return make_weak_ref(b);
}
var ref1;
var ref2;
var maxCounter = 20;
function GCCCUntilCollected() {
SpecialPowers.exactGC(function () {
SpecialPowers.forceCC();
SpecialPowers.forceGC();
SpecialPowers.forceGC();
if ((!weak_ref_dead(ref1) || !weak_ref_dead(ref2)) && --maxCounter > 0) {
requestIdleCallback(GCCCUntilCollected, {timeout: 250});
return;
}
ok(weak_ref_dead(ref1),
"Should collect cycle through callback global");
ok(weak_ref_dead(ref2),
"Should collect cycle through incumbent global");
SimpleTest.finish();
});
}
addLoadEvent(function() {
ref1 = setupTarget1();
ref2 = setupTarget2();
GCCCUntilCollected();
});
</
script>
</
head>
<
body>
<p id=
"display"></p>
<
div id=
"content" style=
"display: none"></
div>
<
iframe id=
"target1"></
iframe>
<
iframe id=
"target2"></
iframe>
<
pre id=
"test"></
pre>
</
body>
</
html>
