src/third_party/WebKit/LayoutTests/resources/leak-check.js

   1 // include resources/js-test.js before this file.
   2
   3 function getCounterValues(callback) {
   4     testRunner.resetTestHelperControllers();
   5     asyncGC(function() {
   6         var ret = {'numberOfLiveDocuments': window.internals.numberOfLiveDocuments()};
   7
   8         var refCountedInstances = JSON.parse(window.internals.dumpRefCountedInstanceCounts());
   9         for (typename in refCountedInstances)
  10             ret['numberOfInstances-'+typename] = refCountedInstances[typename];
  11
  12         callback(ret);
  13     });
  14
  15 }
  16
  17 function compareValues(countersBefore, countersAfter, tolerance) {
  18     for (type in tolerance) {
  19         var before = countersBefore[type];
  20         var after = countersAfter[type];
  21
  22         if (after - before <= tolerance[type])
  23             testPassed('The difference of counter "'+type+'" before and after the cycle is under the threshold of '+tolerance[type]+'.');
  24         else
  25             testFailed('counter "'+type+'" was '+before+' before and now '+after+' after the cycle. This exceeds the threshold of '+tolerance[type]+'.');
  26     }
  27 }
  28
  29 function doLeakTest(src, tolerance) {
  30     var frame = document.createElement('iframe');
  31     document.body.appendChild(frame);
  32     function loadSourceIntoIframe(src, callback) {
  33         var originalSrc = frame.src;
  34
  35         frame.onload = function() {
  36             if (frame.src === originalSrc)
  37                 return true;
  38
  39             callback();
  40             return true;
  41         };
  42         frame.src = src;
  43     }
  44
  45     jsTestIsAsync = true;
  46     if (!window.internals) {
  47         debug("This test only runs on DumpRenderTree, as it requires existence of window.internals and cross-domain resource access check disabled.");
  48         finishJSTest();
  49     }
  50
  51     loadSourceIntoIframe('about:blank', function() {
  52         // blank document loaded...
  53         getCounterValues(function(countersBefore) {
  54             loadSourceIntoIframe(src, function() {
  55                 // target document loaded...
  56
  57                 loadSourceIntoIframe('about:blank', function() {
  58                     // target document unloaded...
  59
  60                     // Measure counter values on next timer event. This is needed
  61                     // to correctly handle deref cycles for some ActiveDOMObjects
  62                     // such as XMLHttpRequest.
  63                     setTimeout(function() {
  64                         getCounterValues(function(countersAfter) {
  65                             compareValues(countersBefore, countersAfter, tolerance);
  66                             finishJSTest();
  67                         });
  68                     }, 0);
  69                 });
  70             });
  71         });
  72     });
  73 }
  74
  75 function htmlToUrl(html) {
  76     return 'data:text/html;charset=utf-8,' + html;
  77 }
  78
  79 function grabScriptText(id) {
  80     return document.getElementById(id).innerText;
  81 }
  82
  83 // include fast/js/resources/js-test-post.js after this file.