third_party/WebKit/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 testDOMImplementation()
  87 {
  88   var impl = document.implementation.createHTMLDocument('').implementation;
  89   gc();
  90   impl.createHTMLDocument('');  // May crash or throw an exception if we collect parent document of impl.
  91 }
  92
  93 function test()
  94 {
  95     if (window.testRunner)
  96         testRunner.dumpAsText();
  97
  98     print("DOM OBJECTS BEFORE GARBAGE COLLECTION:");
  99     generateProperties();
 100
 101     gc();
 102
 103     print("DOM OBJECTS AFTER GARBAGE COLLECTION:");
 104     testPropertiesAgain();
 105
 106     testEvents();
 107     testDOMImplementation();
 108 }
 109
 110 // By default, we expect that custom properties are not allowed.
 111 // If "allow custom" is specified, then custom properties are allowed and survive garbage collection.
 112 // If "allow custom skip" is specified, this means this property is not guaranteed to survive garbage
 113 // collection, so we don't test it at all, since there is a chance it might due to conservative GC algorithm.
 114 // Any uses of "allow custom skip" represent bugs that need to be fixed.
 115
 116 var objectsToTest = [
 117     [ "document.implementation", "allow custom" ], // DOMImplementation
 118     [ "document", "allow custom" ],
 119     [ "document.body", "allow custom" ],
 120     [ "document.body.attributes", "allow custom" ], // NamedNodeMap
 121     [ "document.getElementsByTagName('body')", "allow custom" ], // NodeList
 122     [ "document.getElementsByTagName('canvas')[0].getContext('2d')", "allow custom" ], // CanvasRenderingContext2D
 123     [ "document.getElementsByTagName('canvas')[0].getContext('2d').createLinearGradient(0, 0, 0, 0)" ], // CanvasGradient
 124     [ "document.getElementsByTagName('canvas')[0].getContext('2d').createPattern(document.getElementsByTagName('canvas')[0], 'no-repeat')" ], // CanvasPattern
 125     [ "document.getElementsByTagName('select')[0].options", "allow custom" ],
 126     [ "document.body.childNodes", "allow custom" ],
 127
 128     [ "document.all", "allow custom" ],
 129     [ "document.images", "allow custom" ],
 130     [ "document.embeds", "allow custom" ],
 131     [ "document.applets", "allow custom" ],
 132     [ "document.links", "allow custom" ],
 133     [ "document.forms", "allow custom" ],
 134     [ "document.anchors", "allow custom" ],
 135     [ "document.scripts", "allow custom" ],
 136
 137     [ "document.getElementsByTagName('form')[0].elements", "allow custom" ],
 138     [ "document.getElementsByTagName('table')[0].rows", "allow custom" ],
 139     [ "document.getElementsByTagName('table')[0].rows[0].cells", "allow custom" ],
 140     [ "document.getElementsByTagName('table')[0].tBodies", "allow custom" ],
 141     [ "document.getElementsByTagName('table')[0].tBodies[0].rows", "allow custom" ],
 142     [ "document.body.children", "allow custom" ],
 143     [ "document.getElementsByTagName('map')[0].areas", "allow custom" ],
 144
 145     [ "document.body.style", "allow custom" ],
 146     [ "document.styleSheets", "allow custom" ],
 147     [ "document.styleSheets[0]", "allow custom" ],
 148     [ "document.styleSheets[0].cssRules", "allow custom"],
 149     [ "document.styleSheets[0].cssRules[0]", "allow custom" ],
 150
 151     [ "new XPathEvaluator()" ], // XPathEvaluator
 152     [ "new XPathEvaluator().evaluate('/', document, null, 0, null)" ], // XPathResult
 153     [ "document.createNSResolver(document)" ], // XPathNSResolver
 154     [ "document.createExpression('/', document.createNSResolver(document))" ] // XPathExpression
 155
 156     // should not cache: NodeIterator, NodeFilter, TreeWalker, XMLHttpRequest
 157     // add to test: DOMRect, MediaList, Counter, Range
 158 ];
 159
 160 function generateProperties()
 161 {
 162     for (var i = 0; i < objectsToTest.length; i++) { // >
 163         try {
 164             eval(objectsToTest[i][0] + ".myCustomProperty = 1;");
 165         } catch(e) {
 166             print("NOT SUPPORTED: " + objectsToTest[i][0] + "[ " + e.message + " ]");
 167         }
 168         var expectedResult = objectsToTest[i][1] ? 1 : undefined;
 169         try {
 170             shouldBe(objectsToTest[i][0] + ".myCustomProperty", expectedResult);
 171         } catch(e) {
 172         }
 173     }
 174 }
 175
 176 function testPropertiesAgain()
 177 {
 178     for (var i = 0; i < objectsToTest.length; i++) { // >
 179         if (objectsToTest[i][1] === "allow custom skip")
 180             continue;
 181         var expectedResult = objectsToTest[i][1] ? 1 : undefined;
 182         try {
 183             shouldBe(objectsToTest[i][0] + ".myCustomProperty", expectedResult);
 184         } catch(e) {
 185         }
 186     }
 187 }
 188
 189 </script>
 190 </head>
 191
 192 <body style="color: black" onload="test();">
 193 <p>This page tests whether custom properties on DOM objects persist after garbage collection.</p>
 194 <p>If the test passes, you'll see a series of 'PASS' messages below.</p>
 195 <p>Because neither WinIE nor FF has reasonable or predictable behavior in this scenario, this
 196    test just documents our behavior to ensure that we don't change it accidentally. It is not
 197    a prescription for how things should behave.</p>
 198 <hr>
 199
 200 <div id='console'></div>
 201
 202 <div class='hidden'>
 203     <canvas></canvas>
 204     <select></select>
 205     <object name="object"></object>
 206     <form></form>
 207     <table><tbody><tr></tr></tbody></table>
 208     <map></map>
 209 </div>
 210
 211 </body>
 212 </html>