180537 2017-12-07 11:34:40 -0800 YARR: Coalesce constructed character classes 2022-02-27 23:30:42 -0800 1 1 1 Unclassified WebKit JavaScriptCore Other Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 179230 1 msaboff msaboff ews-watchlist fpizlo jfbastien keith_miller mark.lam saam webkit-bug-importer oldest_to_newest 1379187 0 msaboff 2017-12-07 11:34:40 -0800 Currently when we construct a character class like [abcde], we end up with a check for each character instead of characters in the range of a..e. It is also common for RegExp's to be written with something like [\s\S] when the programmer really wanted a . with the newly added 's', aka dotAll flag. In that case we perform lots of individual character and range checks. Instead we should coalesce characters and ranges when constructing a character class to reduce the resulting checks. 1379188 1 webkit-bug-importer 2017-12-07 11:35:39 -0800 <rdar://problem/35914557> 1379218 2 328716 msaboff 2017-12-07 12:35:54 -0800 Created attachment 328716 Patch 1379219 3 ews-watchlist 2017-12-07 12:38:23 -0800 Attachment 328716 did not pass style-queue: ERROR: Source/JavaScriptCore/yarr/YarrPattern.cpp:406: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] Total errors found: 1 in 5 files If any of these errors are false positives, please file a bug against check-webkit-style. 1379598 4 328716 jfbastien 2017-12-08 09:30:03 -0800 Comment on attachment 328716 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=328716&action=review I'm not an expert in this code, but looks fine overall. Minor comments. > Source/JavaScriptCore/yarr/YarrPattern.cpp:286 > + if (pos + index > 0 && matches[pos + index - 1] == ch - 1) { pos and index are both unsigned, so this is just checking that it's non-zero? Or was the intent to capture wraparound as well? > Source/JavaScriptCore/yarr/YarrPattern.cpp:358 > + // each iteration of the loop we will either remove something from the list, or break the loop. Break the loop, or just break out of it? > Source/JavaScriptCore/yarr/YarrPattern.cpp:407 > + && m_rangesUnicode[0].begin == 0x80 && m_rangesUnicode[0].end == 0x10ffff) I don't get the Unicode range comparison. That's the general non-ASCII range, can the user specify invalid codepoint ranges? Or put another way, when it this range *not* the Unicode range? 1379614 5 328716 msaboff 2017-12-08 10:15:09 -0800 Comment on attachment 328716 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=328716&action=review >> Source/JavaScriptCore/yarr/YarrPattern.cpp:286 >> + if (pos + index > 0 && matches[pos + index - 1] == ch - 1) { > > pos and index are both unsigned, so this is just checking that it's non-zero? Or was the intent to capture wraparound as well? Just checking that it's non-zero. Due to the range of character values (0..0x10ffff), we can't get close to wrapping around even if there was one character per range. >> Source/JavaScriptCore/yarr/YarrPattern.cpp:358 >> + // each iteration of the loop we will either remove something from the list, or break the loop. > > Break the loop, or just break out of it? Break *out of* the loop. >> Source/JavaScriptCore/yarr/YarrPattern.cpp:407 >> + && m_rangesUnicode[0].begin == 0x80 && m_rangesUnicode[0].end == 0x10ffff) > > I don't get the Unicode range comparison. That's the general non-ASCII range, can the user specify invalid codepoint ranges? > > Or put another way, when it this range *not* the Unicode range? This checks that this character class matches every possible character. 1379626 6 msaboff 2017-12-08 10:27:20 -0800 Committed r225683: <https://trac.webkit.org/changeset/225683> 328716 2017-12-07 12:35:54 -0800 2022-02-27 23:30:42 -0800 Patch 180537.patch text/plain 15446 msaboff SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjI1NjQwKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDQyIEBA CisyMDE3LTEyLTA3ICBNaWNoYWVsIFNhYm9mZiAgPG1zYWJvZmZAYXBwbGUuY29tPgorCisgICAg ICAgIFlBUlI6IENvYWxlc2NlIGNvbnN0cnVjdGVkIGNoYXJhY3RlciBjbGFzc2VzCisgICAgICAg IGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xODA1MzcKKworICAgICAg ICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBXaGVuIGFkZGluZyBjaGFy YWN0ZXJzIG9yIGNoYXJhY3RlciByYW5nZXMgdG8gYSBjaGFyYWN0ZXIgY2xhc3MgYmVpbmcgY29u 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