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<p>This test verifies that garbage collection successfully cleans up after the destruction
of a frame containing a JavaScript interpreter. If the test passes, you'll see a PASS message below.</p>
<hr>
<pre id="log"></pre>
<!-- The test: -->
<iframe id="iframe" src="data:text/html,<script>;</script>" style="display:none"></iframe>
<script>
function log(s)
{
document.getElementById("log").appendChild(document.createTextNode(s));
}
var wiggleRoom = 20;
window.onload = function main()
{
if (!window.layoutTestController || !window.GCController) {
log("FAIL: This test uses the layoutTestController and the GCController, so it can only run in DumpRenderTree.\n");
return;
}
layoutTestController.dumpAsText();
layoutTestController.waitUntilDone();
// Start with no garbage, so GC doesn't run automatically during the test.
GCController.collect();
// Create a little garbage, so we can detect failure in the case where the
// test doesn't produce any garbage because it fails to destroy the frame.
var garbage = [ { }, { }, { }, { }, { }, { }, { }, { }, { }, { } ];
garbage = null;
// Destroy a frame that has a JavaScript interpreter.
var iframe = document.getElementById("iframe");
iframe.parentNode.removeChild(iframe);
// Finish the test on a time-out, to allow the Frame keepAlive timer to fire
// and release the frame before we generate results.
var continueTest = function continueTest()
{
// Measure how many garbage JS objects are still around.
var jsObjectCountStart = GCController.getJSObjectCount();
GCController.collect();
var jsObjectCountDelta = jsObjectCountStart - GCController.getJSObjectCount();
var garbageCount = jsObjectCountDelta > 0 ? jsObjectCountDelta : 0;
// Fail if a lot of garbage was left behind. This can mean one of many things:
// the frame was not destroyed; the frame destruction did not trigger GC; or
// GC was not effective.
if (garbageCount > wiggleRoom) {
log("FAIL: " + garbageCount + " garbage JS objects left uncollected.\n");
} else {
log("PASS: " + wiggleRoom + " garbage JS objects or fewer left uncollected after destroying a frame.\n");
}
layoutTestController.notifyDone();
}
setTimeout(continueTest, 10);
}
</script>
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