LayoutTests/fast/dom/gc-9.html

   1 <html>
   2 <head>
   3 <style>
   4     body {
   5         color: black;
   6         padding: 0px 0px 0px 0px;
   7     }
   8
   9     .hidden {
  10         visibility: hidden;
  11     }
  12 </style>
  13 <script>
  14 function print(message, color)
  15 {
  16     var paragraph = document.createElement("div");
  17     paragraph.appendChild(document.createTextNode(message));
  18     paragraph.style.fontFamily = "monospace";
  19     if (color)
  20         paragraph.style.color = color;
  21     document.getElementById("console").appendChild(paragraph);
  22 }
  23
  24 function shouldBe(a, b)
  25 {
  26     var evalA = eval(a);
  27     if (evalA == b)
  28         print("PASS: " + a + " should be " + b + " and is.", "green");
  29     else
  30         print("FAIL: " + a + " should be " + b + " but instead is " + evalA + ".", "red");
  31 }
  32
  33 function gc()
  34 {
  35     if (window.GCController)
  36         return GCController.collect();
  37
  38     for (var i = 0; i < 10000; i++) { // > force garbage collection (FF requires about 9K allocations before a collect)
  39         var s = new String("");
  40     }
  41 }
  42
  43 var event;
  44 function parentEventListener(e)
  45 {
  46     print("DOM EVENT AFTER GARBAGE COLLECTION");
  47     gc();
  48     event = e;
  49     shouldBe("event.myCustomProperty", 1);
  50     event = null; // clear JS reference
  51 }
  52
  53 function childEventListener(e)
  54 {
  55     print("DOM EVENT BEFORE GARBAGE COLLECTION");
  56     e.myCustomProperty = 1;
  57     event = e;
  58     shouldBe("event.myCustomProperty", 1);
  59     event = null; // clear JS reference
  60 }
  61
  62 function testEvents()
  63 {
  64     var parent = document.createElement("p");
  65     var child = document.createElement("p");
  66     parent.appendChild(child);
  67     document.body.appendChild(parent);
  68
  69     if (parent.addEventListener) {
  70         child.addEventListener("click", childEventListener, false);
  71         parent.addEventListener("click", parentEventListener, false);
  72     } else {
  73         child.attachEvent("onclick", childEventListener);
  74         parent.attachEvent("onclick", parentEventListener);
  75     }
  76
  77     if (document.createEvent) {
  78         var event = document.createEvent("MouseEvents");
  79         event.initEvent("click", true, true);
  80         child.dispatchEvent(event);
  81     } else {
  82         child.fireEvent("onclick");
  83     }
  84 }
  85
  86 function test()
  87 {
  88     if (window.layoutTestController)
  89         layoutTestController.dumpAsText();
  90
  91     generateProperties();
  92
  93     print("DOM OBJECTS BEFORE GARBAGE COLLECTION:");
  94     testProperties(expectedResultsBeforeGC);
  95
  96     gc();
  97
  98     print("DOM OBJECTS AFTER GARBAGE COLLECTION:");
  99     testProperties(expectedResultsAfterGC);
 100
 101     testEvents();
 102 }
 103
 104 var objectsToTest = [
 105     "document.implementation", // DOMImplementation
 106     "document",
 107     "document.body",
 108     "document.body.attributes", // NamedNodeMap
 109     "document.getElementsByTagName('body')", // NodeList
 110     "document.getElementsByTagName('canvas')[0].getContext('2d')", // CanvasRenderingContext2D
 111     "document.getElementsByTagName('canvas')[0].getContext('2d').createLinearGradient(0, 0, 0, 0)", // CanvasGradient
 112     "document.getElementsByTagName('canvas')[0].getContext('2d').createPattern(new Image(), 'no-repeat')", // CanvasPattern
 113     "document.getElementsByTagName('select')[0].options",
 114     "document.all",
 115     "document.body.childNodes",
 116
 117     "document.images",
 118     "document.embeds",
 119     "document.applets",
 120     "document.links",
 121     "document.forms",
 122     "document.anchors",
 123     "document.scripts",
 124
 125     "document.getElementsByTagName('form')[0].elements",
 126     "document.getElementsByTagName('table')[0].rows",
 127     "document.getElementsByTagName('table')[0].rows[0].cells",
 128     "document.getElementsByTagName('table')[0].tBodies",
 129     "document.getElementsByTagName('table')[0].tBodies[0].rows",
 130     "document.body.children",
 131     "document.getElementsByTagName('map')[0].areas",
 132
 133     "document.body.style",
 134     "document.body.style.getPropertyCSSValue('color')",
 135     "document.styleSheets",
 136     "document.styleSheets[0]",
 137     "document.styleSheets[0].cssRules",
 138     "document.styleSheets[0].cssRules[0]",
 139
 140     "new XPathEvaluator()", // XPathEvaluator
 141     "new XPathEvaluator().evaluate('/', document, null, 0, null)", // XPathResult
 142     "document.createNSResolver(document)", // XPathNSResolver
 143     "document.createExpression('/', document.createNSResolver(document))" // XPathExpression
 144
 145     // should not cache: NodeIterator, NodeFilter, TreeWalker, XMLHttpRequest
 146     // add to test: DOMRect, MediaList, Counter, Range
 147
 148 ];
 149
 150 var expectedResultsBeforeGC = [
 151     1,
 152     1,
 153     1,
 154     1,
 155     undefined,
 156     1,
 157     undefined,
 158     undefined,
 159     undefined,
 160     undefined,
 161     undefined,
 162     undefined,
 163     undefined,
 164     undefined,
 165     undefined,
 166     undefined,
 167     undefined,
 168     undefined,
 169     undefined,
 170     undefined,
 171     undefined,
 172     undefined,
 173     undefined,
 174     undefined,
 175     undefined,
 176     1,
 177     1,
 178     1,
 179     1,
 180     undefined,
 181     1,
 182     undefined,
 183     undefined,
 184     undefined,
 185     undefined,
 186 ];
 187
 188 var expectedResultsAfterGC = [
 189     undefined,
 190     1,
 191     1,
 192     undefined,
 193     undefined,
 194     undefined,
 195     undefined,
 196     undefined,
 197     undefined,
 198     undefined,
 199     undefined,
 200     undefined,
 201     undefined,
 202     undefined,
 203     undefined,
 204     undefined,
 205     undefined,
 206     undefined,
 207     undefined,
 208     undefined,
 209     undefined,
 210     undefined,
 211     undefined,
 212     undefined,
 213     undefined,
 214     undefined,
 215     undefined,
 216     undefined,
 217     undefined,
 218     undefined,
 219     undefined,
 220     undefined,
 221     undefined,
 222     undefined,
 223     undefined,
 224 ];
 225
 226 function generateProperties()
 227 {
 228     for (var i = 0; i < objectsToTest.length; i++) { // >
 229         try {
 230             eval(objectsToTest[i] + ".myCustomProperty = 1;");
 231         } catch(e) {
 232             print("NOT SUPPORTED: " + objectsToTest[i] + "[ " + e.message + " ]");
 233         }
 234     }
 235 }
 236
 237 function testProperties(expectedResults)
 238 {
 239     for (var i = 0; i < objectsToTest.length; i++) { // >
 240         try {
 241             shouldBe(objectsToTest[i] + ".myCustomProperty", expectedResults[i]);
 242         } catch(e) {
 243         }
 244     }
 245 }
 246 </script>
 247 </head>
 248
 249 <body style="color: black" onload="test();">
 250 <p>This page tests whether custom properties on DOM objects persist after garbage collection.</p>
 251 <p>If the test passes, you'll see a series of 'PASS' messages below.</p>
 252 <p>Because neither WinIE nor FF has reasonable or predictable behavior in this scenario, this
 253    test just documents our behavior to ensure that we don't change it accidentally. It is not
 254    a prescription for how things should behave.</p>
 255 <hr>
 256
 257 <div id='console'></div>
 258
 259 <div class='hidden'>
 260     <canvas></canvas>
 261     <select></select>
 262     <object name="object"></object>
 263     <form></form>
 264     <table><tbody><tr></tr></tbody></table>
 265     <map></map>
 266 </div>
 267
 268 </body>
 269 </html>