зеркало из https://github.com/mozilla/gecko-dev.git
82 строки
2.9 KiB
JavaScript
82 строки
2.9 KiB
JavaScript
// Any copyright is dedicated to the Public Domain.
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// http://creativecommons.org/publicdomain/zero/1.0/
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"use strict"
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// This function runs a number of tests where:
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//
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// 1. An iframe is created
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// 2. The target callback is executed with the iframe's contentWindow as
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// an argument.
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// 3. The iframe is destroyed and GC is forced.
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// 4. Verifies that the iframe's contentWindow has been GC'd.
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//
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// Different ways of destroying the iframe are checked. Simple
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// remove(), destruction via bfcache, or replacement by document.open().
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//
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// Please pass a target callback that exercises the API under
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// test using the given window. The callback should try to leave the
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// API active to increase the liklihood of provoking an API. Any activity
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// should be canceled by the destruction of the window.
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async function checkForEventListenerLeaks(name, target) {
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// Test if we leak in the case where we do nothing special to
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// the frame before removing it from the DOM.
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await _eventListenerLeakStep(target, `${name} default`);
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// Test the case where we navigate the frame before removing it
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// from the DOM so that the window using the target API ends up
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// in bfcache.
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await _eventListenerLeakStep(target, `${name} bfcache`, frame => {
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frame.src = "about:blank";
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return new Promise(resolve => frame.onload = resolve);
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});
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// Test the case where we document.open() the frame before removing
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// it from the DOM so that the window using the target API ends
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// up getting replaced.
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await _eventListenerLeakStep(target, `${name} document.open()`, frame => {
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frame.contentDocument.open();
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frame.contentDocument.close();
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});
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}
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// ----------------
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// Internal helpers
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// ----------------
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// Utility function to create a loaded iframe.
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async function _withFrame(doc, url) {
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let frame = doc.createElement('iframe');
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frame.src = url;
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doc.body.appendChild(frame);
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await new Promise(resolve => frame.onload = resolve);
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return frame;
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}
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// This function defines the basic form of the test cases. We create an
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// iframe, execute the target callback to manipulate the DOM, remove the frame
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// from the DOM, and then check to see if the frame was GC'd. The caller
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// may optionally pass in a callback that will be executed with the
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// frame as an argument before removing it from the DOM.
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async function _eventListenerLeakStep(target, name, extra) {
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let frame = await _withFrame(document, "empty.html");
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await target(frame.contentWindow);
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let weakRef = SpecialPowers.Cu.getWeakReference(frame.contentWindow);
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ok(weakRef.get(), `should be able to create a weak reference - ${name}`);
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if (extra) {
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await extra(frame);
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}
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frame.remove();
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frame = null;
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// Perform two GC'd to avoid intermittent delayed collection.
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await new Promise(resolve => SpecialPowers.exactGC(resolve));
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await new Promise(resolve => SpecialPowers.exactGC(resolve));
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ok(!weakRef.get(), `iframe content window should be garbage collected - ${name}`);
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}
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