178890 2017-10-26 15:25:45 -0700 REGRESSION(r222601): We fail to properly backtrack into a sub pattern of a parenthesis with non-zero minimum 2017-10-26 17:31:55 -0700 1 1 1 Unclassified WebKit JavaScriptCore Other Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 msaboff msaboff buildbot commit-queue keith_miller mark.lam saam webkit-bug-importer oldest_to_newest 1365053 0 msaboff 2017-10-26 15:25:45 -0700 A somewhat reduced test case is: Here is a somewhat reduced test case /:(?:\w)+\(([‘]?)((?:\([^\)]+\)|[^\(\)]*){1,2})\1\)/.exec(“:not('.hs-processed')”) Prior to r222601, the handling of a greedy parenthesis minimum count during backtracking was always 0, ignoring the actual minimum from the pattern. In this case, the parenthesized subpattern, ((?:\([^\)]+\)|[^\(\)]*){1,2}, has a minimum count of 1. Here is a RegExp pattern dump of that part of the expression. non-captured subpattern {1,2} greedy,frame location 4 alternative list,frame location 5 alternative #0: minimum size: 3 character inputPosition 3 '(' not character class inputPosition 4 [ASCII:(')')] not character class inputPosition 5 [ASCII:(')')] {0,...} greedy,frame location 1 character inputPosition 5 ')' alternative #1: minimum size: 0 not character class inputPosition 3 [ASCII:('(',')')] {0,...} greedy,frame location 1 With change r222601, we stop backtracking parenthesis when the match count is equal to the minimum without trying to backtrack the contained sub pattern. If that sub match fails and we are at the minimum, then we can fail the parenthesis backtracking. 1365054 1 msaboff 2017-10-26 15:26:19 -0700 <rdar://problem/35126949> 1365066 2 325069 msaboff 2017-10-26 15:55:41 -0700 Created attachment 325069 Patch 1365123 3 325069 keith_miller 2017-10-26 17:00:24 -0700 Comment on attachment 325069 Patch r=me. 1365155 4 325069 commit-queue 2017-10-26 17:31:54 -0700 Comment on attachment 325069 Patch Clearing flags on attachment: 325069 Committed r224072: <https://trac.webkit.org/changeset/224072> 1365156 5 commit-queue 2017-10-26 17:31:55 -0700 All reviewed patches have been landed. Closing bug. 325069 2017-10-26 15:55:41 -0700 2017-10-26 17:31:54 -0700 Patch 178890.patch text/plain 3061 msaboff SW5kZXg6IEpTVGVzdHMvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIEpTVGVzdHMvQ2hhbmdlTG9n CShyZXZpc2lvbiAyMjQwNTYpCisrKyBKU1Rlc3RzL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpA QCAtMSwzICsxLDE0IEBACisyMDE3LTEwLTI2ICBNaWNoYWVsIFNhYm9mZiAgPG1zYWJvZmZAYXBw bGUuY29tPgorCisgICAgICAgIFJFR1JFU1NJT04ocjIyMjYwMSk6IFdlIGZhaWwgdG8gcHJvcGVy bHkgYmFja3RyYWNrIGludG8gYSBzdWIgcGF0dGVybiBvZiBhIHBhcmVudGhlc2lzIHdpdGggbm9u LXplcm8gbWluaW11bQorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5j Z2k/aWQ9MTc4ODkwCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAg ICAgICAgTmV3IHJlZ3Jlc3Npb24gdGVzdC4KKworICAgICAgICAqIHN0cmVzcy9yZWdyZXNzLTE3 ODg5MC5qczogQWRkZWQuCisKIDIwMTctMTAtMjYgIE1hcmsgTGFtICA8bWFyay5sYW1AYXBwbGUu Y29tPgogCiAgICAgICAgIEpTUm9wZVN0cmluZzo6Um9wZUJ1aWxkZXI6OmFwcGVuZCgpIHNob3Vs ZCBjaGVjayBmb3Igb3ZlcmZsb3dzLgpJbmRleDogSlNUZXN0cy9zdHJlc3MvcmVncmVzcy0xNzg4 OTAuanMKPT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PQotLS0gSlNUZXN0cy9zdHJlc3MvcmVncmVzcy0xNzg4OTAuanMJKG5v bmV4aXN0ZW50KQorKysgSlNUZXN0cy9zdHJlc3MvcmVncmVzcy0xNzg4OTAuanMJKHdvcmtpbmcg Y29weSkKQEAgLTAsMCArMSw0IEBACisvLyBSZWdyZXNzaW9uIHRlc3QgZm9yIGJ1ZyAxNzg4OTAK KworaWYgKCEvOig/Olx3KStcKChbJ10/KSgoPzpcKFteXCldK1wpfFteXChcKV0qKXsxLDJ9KVwx XCkvLnRlc3QoIjpub3QoJy5ocy1wcm9jZXNzZWQnKSIpKQorICAgIHRocm93ICIvOig/Olx3KStc KChbJ10/KSgoPzpcKFteXCldK1wpfFteXChcKV0qKXsxLDJ9KVwxXCkvLnRlc3QoXCI6bm90KCcu aHMtcHJvY2Vzc2VkJylcIikgc2hvdWxkIHN1Y2NlZWQsIGJ1dCBhY3R1YWxseSBmYWlscyI7Cklu ZGV4OiBTb3VyY2UvSmF2YVNjcmlwdENvcmUvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFNvdXJj ZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDIyMzkzNikKKysrIFNvdXJjZS9K YXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cJKHdvcmtpbmcgY29weSkKQEAgLTEsMyArMSwxNyBAQAor MjAxNy0xMC0yNiAgTWljaGFlbCBTYWJvZmYgIDxtc2Fib2ZmQGFwcGxlLmNvbT4KKworICAgICAg ICBSRUdSRVNTSU9OKHIyMjI2MDEpOiBXZSBmYWlsIHRvIHByb3Blcmx5IGJhY2t0cmFjayBpbnRv IGEgc3ViIHBhdHRlcm4gb2YgYSBwYXJlbnRoZXNpcyB3aXRoIG5vbi16ZXJvIG1pbmltdW0KKyAg ICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE3ODg5MAorCisg ICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIFdlIG5lZWQgdG8g bGV0IGEgY29udGFpbmVkIHN1YnBhdHRlcm4gYmFja3RyYWNrIGJlZm9yZSBkZWNsYXJpbmcgdGhh dCB0aGUgY29udGFpbmluZworICAgICAgICBwYXJlbnRoZXNpcyBkb2Vzbid0IG1hdGNoLiAgSWYg dGhlIHN1YnBhdHRlcm4gZmFpbHMgdG8gbWF0Y2ggYmFja3RyYWNraW5nLCB0aGVuIHdlCisgICAg ICAgIGNhbiBjaGVjayB0byBzZWUgaWYgd2UgdHJ5aW5nIHRvIGJhY2t0cmFjayBiZWxvdyB0aGUg bWluaW11bSBtYXRjaCBjb3VudC4KKyAgICAgICAgCisgICAgICAgICogeWFyci9ZYXJySW50ZXJw cmV0ZXIuY3BwOgorICAgICAgICAoSlNDOjpZYXJyOjpJbnRlcnByZXRlcjo6YmFja3RyYWNrUGFy ZW50aGVzZXMpOgorCiAyMDE3LTEwLTI0ICBFcmljIENhcmxzb24gIDxlcmljLmNhcmxzb25AYXBw bGUuY29tPgogCiAgICAgICAgIFdlYiBJbnNwZWN0b3I6IEVuYWJsZSBXZWJLaXQgbG9nZ2luZyBj b25maWd1cmF0aW9uIGFuZCBkaXNwbGF5CkluZGV4OiBTb3VyY2UvSmF2YVNjcmlwdENvcmUveWFy ci9ZYXJySW50ZXJwcmV0ZXIuY3BwCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFNvdXJjZS9KYXZhU2NyaXB0Q29y ZS95YXJyL1lhcnJJbnRlcnByZXRlci5jcHAJKHJldmlzaW9uIDIyMzkzNikKKysrIFNvdXJjZS9K YXZhU2NyaXB0Q29yZS95YXJyL1lhcnJJbnRlcnByZXRlci5jcHAJKHdvcmtpbmcgY29weSkKQEAg LTExMTAsNyArMTExMCw3IEBAIHB1YmxpYzoKICAgICAgICAgfQogCiAgICAgICAgIGNhc2UgUXVh bnRpZmllckdyZWVkeTogewotICAgICAgICAgICAgaWYgKGJhY2tUcmFjay0+bWF0Y2hBbW91bnQg PT0gdGVybS5hdG9tLnF1YW50aXR5TWluQ291bnQpCisgICAgICAgICAgICBpZiAoIWJhY2tUcmFj ay0+bWF0Y2hBbW91bnQpCiAgICAgICAgICAgICAgICAgcmV0dXJuIEpTUmVnRXhwTm9NYXRjaDsK IAogICAgICAgICAgICAgUGFyZW50aGVzZXNEaXNqdW5jdGlvbkNvbnRleHQqIGNvbnRleHQgPSBi YWNrVHJhY2stPmxhc3RDb250ZXh0OwpAQCAtMTEzNiw3ICsxMTM2LDcgQEAgcHVibGljOgogICAg ICAgICAgICAgICAgIHBvcFBhcmVudGhlc2VzRGlzanVuY3Rpb25Db250ZXh0KGJhY2tUcmFjayk7 CiAgICAgICAgICAgICAgICAgZnJlZVBhcmVudGhlc2VzRGlzanVuY3Rpb25Db250ZXh0KGNvbnRl eHQpOwogCi0gICAgICAgICAgICAgICAgaWYgKHJlc3VsdCAhPSBKU1JlZ0V4cE5vTWF0Y2gpCisg ICAgICAgICAgICAgICAgaWYgKHJlc3VsdCAhPSBKU1JlZ0V4cE5vTWF0Y2ggfHwgYmFja1RyYWNr LT5tYXRjaEFtb3VudCA8IHRlcm0uYXRvbS5xdWFudGl0eU1pbkNvdW50KQogICAgICAgICAgICAg ICAgICAgICByZXR1cm4gcmVzdWx0OwogICAgICAgICAgICAgfQogCg==