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<!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 == 0;
}
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);
}
addLoadEvent(function() {
let ref1 = setupTarget1();
let ref2 = setupTarget2();
SpecialPowers.exactGC(function () {
SpecialPowers.forceCC();
SpecialPowers.forceGC();
SpecialPowers.forceGC();
ok(weak_ref_dead(ref1),
"Should collect cycle through callback global");
ok(weak_ref_dead(ref2),
"Should collect cycle through incumbent global");
SimpleTest.finish();
});
});
</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>
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