зеркало из https://github.com/mozilla/pjs.git
Bug 668855, part 6: test weak maps and the cycle collector. r=gal
This commit is contained in:
Andrew McCreight
Родитель
cbcab4c31d
Коммит
dc76cadfab
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@ -73,6 +73,7 @@ _CHROME_FILES = \
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test_precisegc.xul \
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test_precisegc.xul \
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test_nodelists.xul \
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test_nodelists.xul \
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test_getweakmapkeys.xul \
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test_getweakmapkeys.xul \
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test_weakmaps.xul \
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$(NULL)
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$(NULL)
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# Disabled until this test gets updated to test the new proxy based
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# Disabled until this test gets updated to test the new proxy based
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@ -0,0 +1,237 @@
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<?xml version="1.0"?>
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<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
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<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=668855
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-->
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<window title="Mozilla Bug "
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xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
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<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
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<!-- test results are displayed in the html:body -->
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<body xmlns="http://www.w3.org/1999/xhtml">
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<a href="https://bugzilla.mozilla.org/show_bug.cgi?id="
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target="_blank">Mozilla Bug 668855</a>
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</body>
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<!-- test code goes here -->
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<script type="application/javascript">
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<![CDATA[
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/** Test for Bug 668855 **/
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let Cu = Components.utils;
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let Ci = Components.interfaces;
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/* Create a weak reference, with a single-element weak map. */
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let make_weak_ref = function (obj) {
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let m = new WeakMap;
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m.set(obj, {});
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return m;
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};
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/* Check to see if a weak reference is dead. */
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let weak_ref_dead = function (r) {
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return Cu.nondeterministicGetWeakMapKeys(r).length == 0;
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}
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/* Deterministically grab an arbitrary DOM element. */
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let get_live_dom = function () {
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let elems = document.getElementsByTagName("a");
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return elems[0];
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};
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/* Test case from bug 653248, adapted into a standard test.
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This is a dead cycle involving a DOM edge, so the cycle collector can free it. Keys and
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values reachable only from XPConnect must be marked gray for this to work, and the cycle collector
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must know the proper structure of the heap.
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*/
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let make_gray_loop = function () {
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let map = new WeakMap;
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let div = document.createElement("div");
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let key = {};
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div.setUserData("entrain", {m:map, k:key}, null);
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//div.entrain = {m:map, k:key}; This is not sufficient to cause a leak in Fx9
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map.set(key, div);
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return make_weak_ref(map);
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};
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let weakref = make_gray_loop();
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/* Weak map entries where the key is a dead XPCWrappedNative key should be removed.
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map2 is a weak map that is black, so its entries will be visited during the
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black marking phase. We then use a new div element as key. The div element is dead
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after dead_xpc_key returns, so the weak map entry should be removed.
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The simple wrapper deoptimization for XPCWrappedNative weak map keys implemented in
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Bug 655297 will end up marking the key black, keeping the entry from being collected.
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*/
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let map2 = new WeakMap;
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let dead_xpc_key = function () {
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let div = document.createElement("div");
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map2.set(div, 0);
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};
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dead_xpc_key();
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/* Combinations of live and dead gray maps/keys. */
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let basic_weak_ref = null;
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let basic_map_weak_ref = null;
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let black_map = new WeakMap;
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let black_key = {};
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let basic_unit_tests = function () {
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let live_dom = get_live_dom();
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let dead_dom = document.createElement("div");
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let live_map = new WeakMap;
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let dead_map = new WeakMap;
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let live_key = {};
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let dead_key = {};
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// put the live/dead maps/keys into the appropriate DOM elements
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live_dom.basic_unit_tests = {m:live_map, k:live_key};
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dead_dom.setUserData("hook", {m:dead_map, k:dead_key}, null);
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// dead_dom.hook = {m:dead_map, k:dead_key};
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// Create a dead value, and a weak ref to it.
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// The loop keeps dead_dom alive unless the CC is smart enough to kill it.
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let dead_val = {loop:dead_dom};
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basic_weak_ref = make_weak_ref(dead_val);
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basic_map_weak_ref = make_weak_ref(dead_map);
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// set up the actual entries. most will die.
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live_map.set(live_key, {my_key:'live_live'});
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live_map.set(dead_key, dead_val);
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live_map.set(black_key, {my_key:'live_black'});
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dead_map.set(live_key, dead_val);
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dead_map.set(dead_key, dead_val);
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dead_map.set(black_key, dead_val);
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black_map.set(live_key, {my_key:'black_live'});
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black_map.set(dead_key, dead_val);
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black_map.set(black_key, {my_key:'black_black'});
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};
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basic_unit_tests();
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let check_basic_unit = function () {
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let live_dom = get_live_dom();
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let live_map = live_dom.basic_unit_tests.m;
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let live_key = live_dom.basic_unit_tests.k;
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// check the dead elements
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ok(weak_ref_dead(basic_weak_ref), "Dead value was kept alive.");
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ok(weak_ref_dead(basic_map_weak_ref), "Dead map was kept alive.");
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// check the live gray map
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is(live_map.get(live_key).my_key, 'live_live',
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"Live key should have the same value in live map.");
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is(live_map.get(black_key).my_key, 'live_black',
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"Black key should have the same value in live map.");
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is(Cu.nondeterministicGetWeakMapKeys(live_map).length, 2,
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"Live map should have two entries.");
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// check the live black map
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is(black_map.get(live_key).my_key, 'black_live',
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"Live key should have the same value in black map.");
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is(black_map.get(black_key).my_key, 'black_black',
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"Black key should have the same value in black map.");
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is(Cu.nondeterministicGetWeakMapKeys(black_map).length, 2,
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"Black map should have two entries.");
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};
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/* live gray chained weak map entries, involving the cycle collector. */
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let chainm = new WeakMap;
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let num_chains = 5;
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let nested_cc_maps = function () {
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let dom = get_live_dom();
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for(let i = 0; i < num_chains; i++) {
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let k = {count:i};
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dom.key = k;
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dom0 = document.createElement("div");
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chainm.set(k, {d:dom0});
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dom = document.createElement("div");
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dom0.appendChild(dom);
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};
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};
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let check_nested_cc_maps = function () {
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let dom = get_live_dom();
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let all_ok = true;
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for(let i = 0; i < num_chains; i++) {
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let k = dom.key;
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all_ok = all_ok && k.count == i;
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dom = chainm.get(k).d.firstChild;
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};
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ok(all_ok, "Count was invalid on a key in chained weak map entries.");
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};
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nested_cc_maps();
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/* black weak map, chained garbage cycle involving DOM */
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let garbage_map = new WeakMap;
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let chained_garbage_maps = function () {
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let dom0 = document.createElement("div");
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let dom = dom0;
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for(let i = 0; i < num_chains; i++) {
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let k = {};
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dom.key = k;
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let new_dom = document.createElement("div");
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garbage_map.set(k, {val_child:new_dom});
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dom = document.createElement("div");
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new_dom.appendChild(dom);
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};
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// tie the knot
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dom.appendChild(dom0);
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};
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chained_garbage_maps();
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/* set up for running precise GC/CC then checking the results */
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SimpleTest.waitForExplicitFinish();
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Cu.schedulePreciseGC(function () {
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window.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils)
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.cycleCollect();
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window.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils)
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.garbageCollect();
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window.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils)
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.garbageCollect();
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ok(weak_ref_dead(weakref), "Garbage gray cycle should be collected.");
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// this will fail without the XPCwrapped native key fix (Bug 680937)
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todo_is(Cu.nondeterministicGetWeakMapKeys(map2).length, 0, "Dead XPCWrappedNative keys should be collected.");
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check_nested_cc_maps();
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is(Cu.nondeterministicGetWeakMapKeys(garbage_map).length, 0, "Chained garbage weak map entries should not leak.");
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check_basic_unit();
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SimpleTest.finish();
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});
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]]>
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</script>
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</window>
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