LayoutTests/fast/dom/gc-9.html - WebKit - Git at Google

 <html>
 <head>
 <style>
     body {
         color: black;
         padding: 0px 0px 0px 0px;
     }

     .hidden {
         visibility: hidden;
     }
 </style>
 <script>
 function print(message, color)
 {
     var paragraph = document.createElement("div");
     paragraph.appendChild(document.createTextNode(message));
     paragraph.style.fontFamily = "monospace";
     if (color)
         paragraph.style.color = color;
     document.getElementById("console").appendChild(paragraph);
 }

 function shouldBe(a, b)
 {
     var evalA = eval(a);
     if (evalA == b)
         print("PASS: " + a + " should be " + b + " and is.", "green");
     else
         print("FAIL: " + a + " should be " + b + " but instead is " + evalA + ".", "red");
 }

 function gc()
 {
     if (window.GCController)
         return GCController.collect();

     for (var i = 0; i < 10000; i++) { // > force garbage collection (FF requires about 9K allocations before a collect)
         var s = new String("");
     }
 }

 var event;
 function parentEventListener(e)
 {
     print("DOM EVENT AFTER GARBAGE COLLECTION");
     gc();
     event = e;
     shouldBe("event.myCustomProperty", 1);
     event = null; // clear JS reference
 }

 function childEventListener(e)
 {
     print("DOM EVENT BEFORE GARBAGE COLLECTION");
     e.myCustomProperty = 1;
     event = e;
     shouldBe("event.myCustomProperty", 1);
     event = null; // clear JS reference
 }

 function testEvents()
 {
     var parent = document.createElement("p");
     var child = document.createElement("p");
     parent.appendChild(child);
     document.body.appendChild(parent);

     if (parent.addEventListener) {
         child.addEventListener("click", childEventListener, false);
         parent.addEventListener("click", parentEventListener, false);
     } else {
         child.attachEvent("onclick", childEventListener);
         parent.attachEvent("onclick", parentEventListener);
     }

     if (document.createEvent) {
         var event = document.createEvent("MouseEvents");
         event.initEvent("click", true, true);
         child.dispatchEvent(event);
     } else {
         child.fireEvent("onclick");
     }
 }

 function testDOMImplementation()
 {
   var impl = document.implementation.createHTMLDocument('').implementation;
   gc();
   impl.createHTMLDocument('');  // May crash or throw an exception if we collect parent document of impl.
 }

 function test()
 {
     if (window.testRunner)
         testRunner.dumpAsText();

     print("DOM OBJECTS BEFORE GARBAGE COLLECTION:");
     generateProperties();

     gc();

     print("DOM OBJECTS AFTER GARBAGE COLLECTION:");
     testPropertiesAgain();

     testEvents();
     testDOMImplementation();
 }

 // By default, we expect that custom properties are not allowed.
 // If "allow custom" is specified, then custom properties are allowed and survive garbage collection.
 // If "allow custom skip" is specified, this means this property is not guaranteed to survive garbage
 // collection, so we don't test it at all, since there is a chance it might due to conservative GC algorithm.
 // Any uses of "allow custom skip" represent bugs that need to be fixed.

 var objectsToTest = [
     [ "document.implementation", "allow custom" ], // DOMImplementation
     [ "document", "allow custom" ],
     [ "document.body", "allow custom" ],
     [ "document.body.attributes", "allow custom" ], // NamedNodeMap
     [ "document.getElementsByTagName('body')", "allow custom" ], // NodeList
     [ "document.getElementsByTagName('canvas')[0].getContext('2d')", "allow custom" ], // CanvasRenderingContext2D
     [ "document.getElementsByTagName('canvas')[0].getContext('2d').createLinearGradient(0, 0, 0, 0)" ], // CanvasGradient
     [ "document.getElementsByTagName('canvas')[0].getContext('2d').createPattern(new Image(), 'no-repeat')" ], // CanvasPattern
     [ "document.getElementsByTagName('select')[0].options", "allow custom" ],
     [ "document.body.childNodes", "allow custom" ],

     [ "document.all", "allow custom" ],
     [ "document.images", "allow custom" ],
     [ "document.embeds", "allow custom" ],
     [ "document.applets", "allow custom" ],
     [ "document.links", "allow custom" ],
     [ "document.forms", "allow custom" ],
     [ "document.anchors", "allow custom" ],
     [ "document.scripts", "allow custom" ],

     [ "document.getElementsByTagName('form')[0].elements", "allow custom" ],
     [ "document.getElementsByTagName('table')[0].rows", "allow custom" ],
     [ "document.getElementsByTagName('table')[0].rows[0].cells", "allow custom" ],
     [ "document.getElementsByTagName('table')[0].tBodies", "allow custom" ],
     [ "document.getElementsByTagName('table')[0].tBodies[0].rows", "allow custom" ],
     [ "document.body.children", "allow custom" ],
     [ "document.getElementsByTagName('map')[0].areas", "allow custom" ],

     [ "document.body.style", "allow custom" ],
     [ "document.body.style.getPropertyCSSValue('color')", "allow custom" ],
     [ "document.styleSheets", "allow custom" ],
     [ "document.styleSheets[0]", "allow custom" ],
     [ "document.styleSheets[0].cssRules", "allow custom"],
     [ "document.styleSheets[0].cssRules[0]", "allow custom" ],

     [ "new XPathEvaluator()" ], // XPathEvaluator
     [ "new XPathEvaluator().evaluate('/', document, null, 0, null)" ], // XPathResult
     [ "document.createNSResolver(document)" ], // XPathNSResolver
     [ "document.createExpression('/', document.createNSResolver(document))" ] // XPathExpression

     // should not cache: NodeIterator, NodeFilter, TreeWalker, XMLHttpRequest
     // add to test: DOMRect, MediaList, Counter, Range
 ];

 function generateProperties()
 {
     for (var i = 0; i < objectsToTest.length; i++) { // >
         try {
             eval(objectsToTest[i][0] + ".myCustomProperty = 1;");
         } catch(e) {
             print("NOT SUPPORTED: " + objectsToTest[i][0] + "[ " + e.message + " ]");
         }
         var expectedResult = objectsToTest[i][1] ? 1 : undefined;
         try {
             shouldBe(objectsToTest[i][0] + ".myCustomProperty", expectedResult);
         } catch(e) {
         }
     }
 }

 function testPropertiesAgain()
 {
     for (var i = 0; i < objectsToTest.length; i++) { // >
         if (objectsToTest[i][1] === "allow custom skip")
             continue;
         var expectedResult = objectsToTest[i][1] ? 1 : undefined;
         try {
             shouldBe(objectsToTest[i][0] + ".myCustomProperty", expectedResult);
         } catch(e) {
         }
     }
 }

 </script>
 </head>

 <body style="color: black" onload="test();">
 <p>This page tests whether custom properties on DOM objects persist after garbage collection.</p>
 <p>If the test passes, you'll see a series of 'PASS' messages below.</p>
 <p>Because neither WinIE nor FF has reasonable or predictable behavior in this scenario, this
    test just documents our behavior to ensure that we don't change it accidentally. It is not
    a prescription for how things should behave.</p>
 <hr>

 <div id='console'></div>

 <div class='hidden'>
     <canvas></canvas>
     <select></select>
     <object name="object"></object>
     <form></form>
     <table><tbody><tr></tr></tbody></table>
     <map></map>
 </div>

 </body>
 </html>
	<html>
	<head>
	<style>
	body {
	color: black;
	padding: 0px 0px 0px 0px;
	}

	.hidden {
	visibility: hidden;
	}
	</style>
	<script>
	function print(message, color)
	{
	var paragraph = document.createElement("div");
	paragraph.appendChild(document.createTextNode(message));
	paragraph.style.fontFamily = "monospace";
	if (color)
	paragraph.style.color = color;
	document.getElementById("console").appendChild(paragraph);
	}

	function shouldBe(a, b)
	{
	var evalA = eval(a);
	if (evalA == b)
	print("PASS: " + a + " should be " + b + " and is.", "green");
	else
	print("FAIL: " + a + " should be " + b + " but instead is " + evalA + ".", "red");
	}

	function gc()
	{
	if (window.GCController)
	return GCController.collect();

	for (var i = 0; i < 10000; i++) { // > force garbage collection (FF requires about 9K allocations before a collect)
	var s = new String("");
	}
	}

	var event;
	function parentEventListener(e)
	{
	print("DOM EVENT AFTER GARBAGE COLLECTION");
	gc();
	event = e;
	shouldBe("event.myCustomProperty", 1);
	event = null; // clear JS reference
	}

	function childEventListener(e)
	{
	print("DOM EVENT BEFORE GARBAGE COLLECTION");
	e.myCustomProperty = 1;
	event = e;
	shouldBe("event.myCustomProperty", 1);
	event = null; // clear JS reference
	}

	function testEvents()
	{
	var parent = document.createElement("p");
	var child = document.createElement("p");
	parent.appendChild(child);
	document.body.appendChild(parent);

	if (parent.addEventListener) {
	child.addEventListener("click", childEventListener, false);
	parent.addEventListener("click", parentEventListener, false);
	} else {
	child.attachEvent("onclick", childEventListener);
	parent.attachEvent("onclick", parentEventListener);
	}

	if (document.createEvent) {
	var event = document.createEvent("MouseEvents");
	event.initEvent("click", true, true);
	child.dispatchEvent(event);
	} else {
	child.fireEvent("onclick");
	}
	}

	function testDOMImplementation()
	{
	var impl = document.implementation.createHTMLDocument('').implementation;
	gc();
	impl.createHTMLDocument(''); // May crash or throw an exception if we collect parent document of impl.
	}

	function test()
	{
	if (window.testRunner)
	testRunner.dumpAsText();

	print("DOM OBJECTS BEFORE GARBAGE COLLECTION:");
	generateProperties();

	gc();

	print("DOM OBJECTS AFTER GARBAGE COLLECTION:");
	testPropertiesAgain();

	testEvents();
	testDOMImplementation();
	}

	// By default, we expect that custom properties are not allowed.
	// If "allow custom" is specified, then custom properties are allowed and survive garbage collection.
	// If "allow custom skip" is specified, this means this property is not guaranteed to survive garbage
	// collection, so we don't test it at all, since there is a chance it might due to conservative GC algorithm.
	// Any uses of "allow custom skip" represent bugs that need to be fixed.

	var objectsToTest = [
	[ "document.implementation", "allow custom" ], // DOMImplementation
	[ "document", "allow custom" ],
	[ "document.body", "allow custom" ],
	[ "document.body.attributes", "allow custom" ], // NamedNodeMap
	[ "document.getElementsByTagName('body')", "allow custom" ], // NodeList
	[ "document.getElementsByTagName('canvas')[0].getContext('2d')", "allow custom" ], // CanvasRenderingContext2D
	[ "document.getElementsByTagName('canvas')[0].getContext('2d').createLinearGradient(0, 0, 0, 0)" ], // CanvasGradient
	[ "document.getElementsByTagName('canvas')[0].getContext('2d').createPattern(new Image(), 'no-repeat')" ], // CanvasPattern
	[ "document.getElementsByTagName('select')[0].options", "allow custom" ],
	[ "document.body.childNodes", "allow custom" ],

	[ "document.all", "allow custom" ],
	[ "document.images", "allow custom" ],
	[ "document.embeds", "allow custom" ],
	[ "document.applets", "allow custom" ],
	[ "document.links", "allow custom" ],
	[ "document.forms", "allow custom" ],
	[ "document.anchors", "allow custom" ],
	[ "document.scripts", "allow custom" ],

	[ "document.getElementsByTagName('form')[0].elements", "allow custom" ],
	[ "document.getElementsByTagName('table')[0].rows", "allow custom" ],
	[ "document.getElementsByTagName('table')[0].rows[0].cells", "allow custom" ],
	[ "document.getElementsByTagName('table')[0].tBodies", "allow custom" ],
	[ "document.getElementsByTagName('table')[0].tBodies[0].rows", "allow custom" ],
	[ "document.body.children", "allow custom" ],
	[ "document.getElementsByTagName('map')[0].areas", "allow custom" ],

	[ "document.body.style", "allow custom" ],
	[ "document.body.style.getPropertyCSSValue('color')", "allow custom" ],
	[ "document.styleSheets", "allow custom" ],
	[ "document.styleSheets[0]", "allow custom" ],
	[ "document.styleSheets[0].cssRules", "allow custom"],
	[ "document.styleSheets[0].cssRules[0]", "allow custom" ],

	[ "new XPathEvaluator()" ], // XPathEvaluator
	[ "new XPathEvaluator().evaluate('/', document, null, 0, null)" ], // XPathResult
	[ "document.createNSResolver(document)" ], // XPathNSResolver
	[ "document.createExpression('/', document.createNSResolver(document))" ] // XPathExpression

	// should not cache: NodeIterator, NodeFilter, TreeWalker, XMLHttpRequest
	// add to test: DOMRect, MediaList, Counter, Range
	];

	function generateProperties()
	{
	for (var i = 0; i < objectsToTest.length; i++) { // >
	try {
	eval(objectsToTest[i][0] + ".myCustomProperty = 1;");
	} catch(e) {
	print("NOT SUPPORTED: " + objectsToTest[i][0] + "[ " + e.message + " ]");
	}
	var expectedResult = objectsToTest[i][1] ? 1 : undefined;
	try {
	shouldBe(objectsToTest[i][0] + ".myCustomProperty", expectedResult);
	} catch(e) {
	}
	}
	}

	function testPropertiesAgain()
	{
	for (var i = 0; i < objectsToTest.length; i++) { // >
	if (objectsToTest[i][1] === "allow custom skip")
	continue;
	var expectedResult = objectsToTest[i][1] ? 1 : undefined;
	try {
	shouldBe(objectsToTest[i][0] + ".myCustomProperty", expectedResult);
	} catch(e) {
	}
	}
	}

	</script>
	</head>

	<body style="color: black" onload="test();">
	<p>This page tests whether custom properties on DOM objects persist after garbage collection.</p>
	<p>If the test passes, you'll see a series of 'PASS' messages below.</p>
	<p>Because neither WinIE nor FF has reasonable or predictable behavior in this scenario, this
	test just documents our behavior to ensure that we don't change it accidentally. It is not
	a prescription for how things should behave.</p>
	<hr>

	<div id='console'></div>

	<div class='hidden'>
	<canvas></canvas>
	<select></select>
	<object name="object"></object>
	<form></form>
	<table><tbody><tr></tr></tbody></table>
	<map></map>
	</div>

	</body>
	</html>