The Tor Browser: dom/plugins/test/mochitest/test

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 <head>

     2   <title>GC race with actors on the parent</title>

     4   <script type="text/javascript"

     5 	  src="/tests/SimpleTest/SimpleTest.js"></script>

     6   <script type="text/javascript" src="utils.js"></script>

     7   <link rel="stylesheet" type="text/css"

     8 	href="/tests/SimpleTest/test.css" />

     9 <body onload="start()">

    10   <p id="display"></p>

    12   <script class="testbody" type="application/javascript">

    13     SimpleTest.waitForExplicitFinish();

    14     setTestPluginEnabledState(SpecialPowers.Ci.nsIPluginTag.STATE_ENABLED);

    16     function start() {

    17       if (!SimpleTest.testPluginIsOOP()) {

    18         ok(true, "Skipping this test when test plugin is not OOP.");

    19         SimpleTest.finish();

    20         return;

    21       }

    22       else {

    23         if (navigator.platform.startsWith("Win")) {

    24           SimpleTest.expectAssertions(0, 350);

    25         }

    27         setTimeout(checkGCRace, 1000);

    28       }

    29     }

    31     var nested = false;

    33     function cb(f) {

    34       ok(!nested, "Callback shouldn't occur in a nested stack frame");

    35       try {

    36         f(35);

    37         ok(true, "Callback was called, no crash");

    38       }

    39       catch (e) {

    40         ok(false, "Exception calling callback object: " + e);

    41       }

    42       SimpleTest.executeSoon(removePlugin);

    43     }

    45     function removePlugin() {

    46       var p = document.getElementById('p');

    47       p.parentNode.removeChild(p);

    48       p = null;

    49       SpecialPowers.Cu.forceGC();

    50       SimpleTest.finish();

    51     }

    53     function checkGCRace() {

    54       nested = true;

    56       // The plugin will hand back a function and immediately sleep.

    57       // We will lose our only reference to the function and force GC, followed

    58       // by calling us with that function object again. We should be able to

    59       // call the function and not crash.

    60       var p = document.getElementById('p');

    61       var f = p.checkGCRace(cb);

    62       f = null;  // 'f' should be collected next GC

    64       nested = false;

    66       setTimeout(function() {

    67         SpecialPowers.Cu.forceGC();

    68       }, 2000);

    69     }

    70   </script>

    72   <embed id="p" type="application/x-test" wmode="window"></embed>

The Tor Browser / file revision