toolkit/xre/test/test_fpuhandler.html

   1 <head>
   2   <title>Floating-point exception handler test</title>
   3   <script type="application/javascript" src="/MochiKit/packed.js"></script>
   4   <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
   5
   6 <body onload="runTest()">
   7   <embed id="plugin1" type="application/x-test" width="400" height="400"></embed>
   8
   9   <script class="testbody" type="application/javascript">
  10   SimpleTest.waitForExplicitFinish();
  11
  12   function doDiv(x, y) {
  13     var z;
  14     z = x / y;
  15
  16     for (i = 0 + x; i < 1000; ++i)
  17       z = y / x;
  18
  19     z = x / y;
  20     return z;
  21   }
  22
  23   function runTest()
  24   {
  25     ok(isNaN(doDiv(0.0, 0.0)), "Undefined division-by-zero doesn't crash");
  26
  27     try {
  28       document.getElementById('plugin1').enableFPExceptions();
  29     }
  30     catch (e) {
  31       ok(true, "No special code to set the FPU bit in the testplugin.");
  32       SimpleTest.finish();
  33       return;
  34     }
  35
  36     ok(isNaN(doDiv(0.0, 0.0)), "Undefined division-by-zero doesn't crash again.");
  37     SimpleTest.finish();
  38   }
  39   </script>