142792 2015-03-17 14:53:56 -0700 Objects with numeric properties intermittently get a phantom 'length' property 2015-04-08 07:15:33 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) iPhone / iPad iOS 8.1 RESOLVED FIXED InRadar P2 Normal --- 108645 1 osolo msaboff caitp fpizlo ggaren jstephenson-wkbgz mathias m.goleb+bugzilla mhahnenb msaboff osolo ossy webkit-bug-importer ysuzuki oldest_to_newest 1077976 0 osolo 2015-03-17 14:53:56 -0700 There is a timing bug in iOS8 that causes mobile Safari to incorrectly report a 'length' on objects that don't have one. To the best of my knowledge, this happens on iOS8+, possibly only on 64-bit systems. The bug is triggered for objects that have only numeric properties. For example: foo = { 1: 'a', 2: 'b', 3: 'c' } In this case, if you query foo.length then mobile Safari will sometimes return 4 (the highest property + 1). This causes strange failures in functions like jQuery's $.each() or Underscore's _.each() since the appearance of the '.length' property makes them believe the object is an array. When the bug manifests itself, the following be true: a = foo.length; b = typeof a; c = foo.hasOwnProperty('length') --> a == 4 // should have been undefined b == 'number' // should have been 'undefined' c == false // correct Both jQuery and Underscore to use the 'typeof' test on the length property, and I have advised them to add an 'hasOwnProperty' check as well. You can see more background and some repro steps at the following Stack Overflow discussion: http://stackoverflow.com/questions/28155841/misterious-failure-of-jquery-each-and-underscore-each-on-ios The Underscore team have apparently managed to create an automated test for this: https://github.com/jashkenas/underscore/issues/2081 The jQuery issue is here: https://github.com/jquery/jquery/issues/2145 1080253 1 webkit-bug-importer 2015-03-26 04:12:05 -0700 <rdar://problem/20307461> 1080279 2 ysuzuki 2015-03-26 08:04:12 -0700 ossy, now I think it may be related to aarch64 failures with "length" property. 1080439 3 msaboff 2015-03-26 15:49:40 -0700 I can reproduce on iOS ARM64 in ToT (r182023) WebKit. It doesn't happen in on ARM32 or Mac. Curious. 1080470 4 249534 msaboff 2015-03-26 16:16:48 -0700 Created attachment 249534 Converted supplied test into a regression test 1080507 5 msaboff 2015-03-26 17:18:06 -0700 Looks like we have a bad instruction optimization when comparing a literal with a single bit to a register in MacroAssemblerARM64::branchTest32(). Patch in progress. 1080589 6 249564 msaboff 2015-03-27 07:06:00 -0700 Created attachment 249564 Patch 1080592 7 249564 ossy 2015-03-27 07:18:05 -0700 Comment on attachment 249564 Patch nice catch, r=me 1080593 8 msaboff 2015-03-27 07:29:15 -0700 Committed r182058: <http://trac.webkit.org/changeset/182058> 1080638 9 mhahnenb 2015-03-27 10:26:54 -0700 This might be my favorite bug/fix ever. 1080664 10 ossy 2015-03-27 11:03:12 -0700 *** Bug 142575 has been marked as a duplicate of this bug. *** 1080800 11 m.goleb+bugzilla 2015-03-27 16:25:54 -0700 It would be great to have it backported to iOS 8. If that's not planned (or if it's planned but we're be notified about that) we'll have to publish another patch release of jQuery dedicated to Safari; the first one was: http://blog.jquery.com/2014/12/18/jquery-1-11-2-and-2-1-3-released-safari-fail-safe-edition/ 249534 2015-03-26 16:16:48 -0700 2015-03-27 07:06:00 -0700 Converted supplied test into a regression test 142792-regress-tests.patch text/plain 2595 msaboff SW5kZXg6IExheW91dFRlc3RzL2pzL3JlZ3Jlc3MtMTQyNzkyLWV4cGVjdGVkLnR4dAo9PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09Ci0tLSBMYXlvdXRUZXN0cy9qcy9yZWdyZXNzLTE0Mjc5Mi1leHBlY3RlZC50eHQJKHJldmlz aW9uIDApCisrKyBMYXlvdXRUZXN0cy9qcy9yZWdyZXNzLTE0Mjc5Mi1leHBlY3RlZC50eHQJKHdv cmtpbmcgY29weSkKQEAgLTAsMCArMSwxMCBAQAorVmVyaWZ5IHRoYXQgb2JqZWN0cyB3aXRoIG51 bWVyaWMgbmFtZWQgcHJvcGVydGllcyBkb24ndCBzZXQgbGVuZ3RoIGxpa2UgYW4gYXJyYXkuCisK K09uIHN1Y2Nlc3MsIHlvdSB3aWxsIHNlZSBhIHNlcmllcyBvZiAiUEFTUyIgbWVzc2FnZXMsIGZv 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