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Auto merge of #8227 - asajeffrey:versioned_dom, r=eefriedman

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Versioned dom

This PR adds versioning to the DOM. There are now node.get_version and node.get_descendent_version methods that return a counter that is bumped when the node is dirtied. This is used to implement cache invalidation for caching HTMLCollection state. Caching HTMCollections gets a 1000x speedup in the Dromaeo DOM query tests.

Addresses https://github.com/servo/servo/issues/6901, https://github.com/servo/servo/issues/3381 and https://github.com/servo/servo/issues/1916.

Replaces PR https://github.com/servo/servo/pull/6927.

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This commit is contained in:
bors-servo 2015-11-10 01:11:23 +05:30
commit f39faaf994
7 changed files with 325 additions and 89 deletions
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57
tests/wpt/mozilla/tests/mozilla/htmlcollection.html
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@ -52,13 +52,68 @@
var new_live = document.createElement("div");
new_live.className = "live";
assert_equals(htmlcollection.length, 1);
document.body.appendChild(new_live);
assert_equals(htmlcollection.length, 2);
assert_equals(htmlcollection.item(1), new_live);
new_live.className = "dead";
assert_equals(htmlcollection.length, 1);
new_live.className = "live";
assert_equals(htmlcollection.length, 2);
document.body.removeChild(new_live);
assert_equals(htmlcollection.length, 1);
}, "live HTMLCollection");
}, "live HTMLCollection byClassName");
test(function() {
var element = document.createElement("div");
var coll = element.getElementsByTagName("div");
assert_equals(coll.length, 0);
element.innerHTML = '<div id="q1"><span id="q2">a</span><div id="q3">b</div><div id="q4">c</div></div>';
assert_equals(coll.length, 3);
var child = coll[0];
var grandchild = coll[1];
assert_equals(child.id, "q1");
assert_equals(grandchild.id, "q3");
assert_equals(grandchild.parentNode, child);
assert_equals(child.parentNode, element);
child.removeChild(grandchild);
assert_equals(coll.length, 2);
child.appendChild(grandchild);
assert_equals(coll.length, 3);
}, "live HTMLCollection byTagName");
test(function() {
var element = document.createElement("div");
var coll = element.getElementsByTagName("div");
assert_equals(coll.length, 0);
element.innerHTML = '<div id="n0"><div id="n1"><div id="n2"></div><div id="n3"></div></div></div>';
assert_equals(coll.length, 4);
assert_equals(coll[3].id, "n3");
assert_equals(coll[2].id, "n2");
assert_equals(coll[2].id, "n2");
assert_equals(coll[1].id, "n1");
assert_equals(coll[2].id, "n2");
assert_equals(coll[0].id, "n0");
assert_equals(coll[0].id, "n0");
assert_equals(coll[2].id, "n2");
assert_equals(coll[1].id, "n1");
assert_equals(coll[2].id, "n2");
assert_equals(coll[3].id, "n3");
assert_equals(coll.length, 4);
}, "HTMLCollection cursoring");
test(function() {
assert_equals(document.getElementsByTagName("DIV").length, 5);