| <script> |
| // The test works by first navigating iframe to a page that allocates a lot of JS objects |
| // and then creates a long timeout. Then iframe is navigated to about:blank and the number of JS |
| // objects is verified - there should be a significant drop in their number. |
| |
| var objectCountBefore; |
| function start() { |
| if (window.layoutTestController && window.GCController) { |
| layoutTestController.dumpAsText(); |
| layoutTestController.waitUntilDone(); |
| window.GCController.collect(); |
| objectCountBefore = window.GCController.getJSObjectCount(); |
| var iframeElement = document.getElementById("iframe"); |
| iframeElement.setAttribute("onload", "loadBlank()"); |
| iframeElement.src = "resources/long_timeout.html"; |
| } |
| } |
| |
| var objectCountAfterLoad; |
| function loadBlank() { |
| window.GCController.collect(); |
| objectCountAfterLoad = window.GCController.getJSObjectCount(); |
| var iframeElement = document.getElementById("iframe"); |
| iframeElement.setAttribute("onload", "verify()"); |
| iframeElement.src = "about:blank"; |
| } |
| |
| function verify() |
| { |
| var allocatedObjects = 1000; // Number of allocated objects in "resources/long_timeout.html". |
| var threshold = allocatedObjects / 2; |
| |
| window.GCController.collect(); |
| var objectCountAfter = window.GCController.getJSObjectCount(); |
| // Some number of objects is still not released (possibly related to execution of this script). |
| // Use a threshold which is less then the numebr of allocated objects in "resources/long_timeout.html" to account for this. |
| var success = (objectCountAfter - objectCountBefore) < threshold; |
| document.getElementById("result").innerText = (success ? "PASS" : "FAIL" + |
| ", before: " + objectCountBefore + |
| ", after load: " + objectCountAfterLoad + |
| ", after: " + objectCountAfter); |
| layoutTestController.notifyDone(); |
| } |
| </script> |
| <body onload="start()"> |
| <p>This test verifies that an active timeout that didn't yet fire does not prevent a Document from releasing (bug https://bugs.webkit.org/show_bug.cgi?id=22710). Test can only run in DumpRenderTree since it needs GCController. Test is successful if it prints 'PASS'.</p> |
| <div id="result"></div> |
| <iframe id="iframe"></iframe> |
| </body> |
