22001 2008-10-31 08:22:06 -0700 AtomicStringImpl* keys of event listener maps can outlive their strings 2008-11-01 00:26:08 -0700 1 1 1 Unclassified WebKit WebCore Misc. 528+ (Nightly build) Mac OS X 10.5 RESOLVED FIXED P2 Normal --- 1 ap ap simon.fraser oldest_to_newest 97244 0 ap 2008-10-31 08:22:06 -0700 Turns out that we actually have bugs caused by not ref'ing HashMap and HashSet keys, see attachment. We should audit other uses of StringImpl* and AtomicStringImpl*, too. 97245 1 24799 ap 2008-10-31 08:23:39 -0700 Created attachment 24799 test case 97247 2 simon.fraser 2008-10-31 09:04:13 -0700 It would be good if the testcase printed a PASS or FAIL; it's hard to see what it's doing. Have you identified the HashMap/HashSet in question? 97254 3 darin 2008-10-31 10:07:22 -0700 I'm not sure I agree with the title of this bug. Sure, it'd be easier to program with a map and set that did a ref/deref on its keys. But there are at least two other solutions to problems at any individual call site: 1) Add code to remove the string when it no longer should be in the collection. That code can be run by the owner of the string. 2) Add explicit ref/deref. These are both possibly tricky to get right, and may be inferior solutions to the problem. But I generally would prefer not to name bugs after a particular solution to a problem. 97268 4 ap 2008-10-31 11:25:03 -0700 I was (and still am) going to tackle this myself, so the test is indeed somewhat sub-standard, and the bug title indeed implies the solution I plan to employ. This particular case is XMLHttpRequest::m_eventListeners, but similar code exists elsewhere. 97273 5 ap 2008-10-31 11:39:19 -0700 On the other hand, the promise to audit all the uses of AtomicStringImpl* as a key was a bit presumptuous, as many of these are in code I'm not closely familiar with. So I'm going to fix just the EventListenersMap bug here. 97281 6 24807 ap 2008-10-31 12:25:49 -0700 Created attachment 24807 proposed fix 97284 7 24807 darin 2008-10-31 12:37:54 -0700 Comment on attachment 24807 proposed fix r=me 97362 8 ap 2008-11-01 00:26:08 -0700 Committed r38064. 24799 2008-10-31 08:23:39 -0700 2008-10-31 08:23:39 -0700 test case DestroyedAtomicString.html text/html 481 ap PHNjcmlwdD4KZnVuY3Rpb24gZ2MoKQp7CiAgICBpZiAod2luZG93LkdDQ29udHJvbGxlcikKICAg ICAgICByZXR1cm4gR0NDb250cm9sbGVyLmNvbGxlY3QoKTsKCiAgICBmb3IgKHZhciBpID0gMDsg aSA8IDEwMDAwOyBpKyspIHsgLy8gPiBmb3JjZSBnYXJiYWdlIGNvbGxlY3Rpb24gKEZGIHJlcXVp cmVzIGFib3V0IDlLIGFsbG9jYXRpb25zIGJlZm9yZSBhIGNvbGxlY3QpCiAgICAgICAgdmFyIHMg PSBuZXcgU3RyaW5nKCJhYmMiKTsKICAgIH0KfQoKdmFyIHJlcSA9IG5ldyBYTUxIdHRwUmVxdWVz dDsKcmVxLmFkZEV2ZW50TGlzdGVuZXIoImZvbyIsIGZ1bmN0aW9uKCkgeyBhbGVydCgwKSB9LCB0 cnVlKTsKdmFyIGV2dCA9IGRvY3VtZW50LmNyZWF0ZUV2ZW50KCJNZXNzYWdlRXZlbnQiKTsKZ2Mo 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