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