third_party/WebKit/LayoutTests/fast/events/event-properties-gc.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <script src="../../resources/js-test.js"></script>
   5 </head>
   6 <body>
   7 <script>
   8 window.jsTestIsAsync = true;
   9 description("Tests that properties passed to events are not garbage collected prematurely.");
  10
  11 function addListener(eventType, prop) {
  12     document.addEventListener(eventType, function(event) {
  13         window.prop = prop;
  14         // Despite the earlier assignement of the local variable to null and
  15         // the following garabage collection, the property should still be
  16         // present here.
  17         shouldBeEqualToString("event[prop]", "foo");
  18
  19         window.prop = undefined;
  20         window.postMessage("done", "*");
  21     });
  22 }
  23
  24 // Run the tests whenever a notification arrives, which indicates that the
  25 // previous test has finished.
  26 window.addEventListener("message", function(message) {
  27     runNextTest();
  28 }, false);
  29
  30 function newEvent(eventType, prop, value) {
  31     return eval("new " + eventType + "('" + eventType + "', { " + prop + ": value })");
  32 }
  33
  34 // The events that we want to test, with the properties that each one uses.
  35 var events = [
  36     { eventType: "CustomEvent", prop: "detail" },
  37     { eventType: "MessageEvent", prop: "data" },
  38     { eventType: "PopStateEvent", prop: "state" }
  39 ];
  40
  41 function runNextTest () {
  42     var evt = events.pop();
  43     if (!evt) {
  44         finishJSTest();
  45         return;
  46     }
  47
  48     var value = "foo";
  49     var eventToDispatch = newEvent(evt.eventType, evt.prop, value);
  50     value = null;
  51     gc();
  52
  53     addListener(evt.eventType, evt.prop);
  54     document.dispatchEvent(eventToDispatch);
  55 };
  56
  57 // This test is meaningless without testRunner.
  58 if (window.testRunner) {
  59     runNextTest();
  60 }
  61 </script>
  62 </body>
  63 </html>