202041 2019-09-20 02:30:10 -0700 [YARR] Properly handle surrogates when matching back references 2019-10-01 11:24:24 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 202042 202310 1 pmatos msaboff ews-watchlist fpizlo keith_miller mark.lam msaboff saam ticaiolima tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1572706 0 pmatos 2019-09-20 02:30:10 -0700 Since the fix for https://bugs.webkit.org/show_bug.cgi?id=201647 (whose report I don't have permissions to read), that we noticed the test stress/regexp-unicode-surrogate-pair-increment-should-involve-length-check.js (added with the mentioned fix) started failing on 32bits ARM. Turns out this is because we don't have YARR JIT enabled and it's not specific to 32bits. If I disable YARR JIT on 64bits, I can reproduce the same failure in other archs. $ WebKitBuild/Debug/bin/jsc --useRegExpJIT=0 JSTests/stress/regexp-unicode-surrogate-pair-increment-should-involve-length-check.js null Exception: Expected /([^x]+)[^]*\1([^])/u to match "�𐀀" but it didn't 1572707 1 pmatos 2019-09-20 02:31:22 -0700 Adding to CC msaboff and ysuzuki who were involved with https://bugs.webkit.org/show_bug.cgi?id=201647 1572723 2 pmatos 2019-09-20 05:22:37 -0700 Related patch to add failed run to set of tests: https://bugs.webkit.org/show_bug.cgi?id=202042 1573282 3 pmatos 2019-09-23 06:32:52 -0700 I am investigating this at the moment. It seems interpretation of backreferences are broken: >>> /([^x]+)\1/u.exec("\ud800\ud800\udc00") null when starting jsc with $ WebKitBuild/Debug/bin/jsc --useRegExpJIT=0 1573609 4 pmatos 2019-09-24 01:50:53 -0700 The current understanding is slightly different than the initial one. The RegExp JIT is broken, not the interpreter. All other engines seem to agree that: /([^x]+)[^]*\1([^])/u.exec("\ud800\ud800\udc00") should _not_ match. There are three surrogates, one unpaired (the first \ud800) and two paired with each other (\ud800\udc00). The [^x]+ should match and capture the unpaired surrogate \ud800 and the backreference should not possibly capture part of the paired surrogate with \1. This should therefore fail. 1574045 5 379547 pmatos 2019-09-25 07:35:55 -0700 Created attachment 379547 WIP - Patch 1574084 6 379547 ews-watchlist 2019-09-25 09:48:12 -0700 Comment on attachment 379547 WIP - Patch Attachment 379547 did not pass jsc-ews (mac): Output: https://webkit-queues.webkit.org/results/13067037 New failing tests: jsc-layout-tests.yaml/fast/regex/script-tests/backreferences.js.layout-dfg-eager-no-cjit jsc-layout-tests.yaml/js/script-tests/regexp-unicode.js.layout-no-ftl jsc-layout-tests.yaml/js/script-tests/regexp-unicode.js.layout-ftl-no-cjit jsc-layout-tests.yaml/fast/regex/script-tests/backreferences.js.layout-ftl-eager-no-cjit jsc-layout-tests.yaml/js/script-tests/regexp-unicode.js.layout-ftl-eager-no-cjit jsc-layout-tests.yaml/fast/regex/script-tests/backreferences.js.layout-no-ftl jsc-layout-tests.yaml/fast/regex/script-tests/backreferences.js.layout-no-llint jsc-layout-tests.yaml/fast/regex/script-tests/backreferences.js.layout jsc-layout-tests.yaml/fast/regex/script-tests/backreferences.js.layout-no-cjit jsc-layout-tests.yaml/js/script-tests/regexp-unicode.js.layout-dfg-eager-no-cjit jsc-layout-tests.yaml/fast/regex/script-tests/backreferences.js.layout-ftl-no-cjit jsc-layout-tests.yaml/js/script-tests/regexp-unicode.js.layout-no-cjit jsc-layout-tests.yaml/js/script-tests/regexp-unicode.js.layout jsc-layout-tests.yaml/js/script-tests/regexp-unicode.js.layout-no-llint 1574273 7 379547 msaboff 2019-09-25 16:30:10 -0700 Comment on attachment 379547 WIP - Patch r- This patch is mostly right. It needs 2 changes. 1) We need to properly increment the patternIndex and index when matching non-BMP characters. 2) There is a register clobbering issue on X86_64 since tryReadUnicodeCharImpl() uses r10 as a temp and patternChar is also r10. Posting a patch shortly that builds on this patch and addresses these two issues. 1574299 8 379595 msaboff 2019-09-25 17:24:16 -0700 Created attachment 379595 Patch 1574302 9 379597 msaboff 2019-09-25 17:33:03 -0700 Created attachment 379597 Updated ChangeLogs citing Paulo Matos <pmatos@igalia.com> original contribution. 1574453 10 pmatos 2019-09-26 08:19:37 -0700 Thanks Michael, I was still looking at this issue and just noticed you fixed it. I had a little testsuite with the most relevant tests to run: let match1 = /([^x])\1./u.exec('\ud800\ud800\udc00'); if (match1) { print('error 1'); } let match2 = /(\u{10123})x\1/u.exec('\u{10123}x\u{10123}'); if (!match2 || match2[1] !== '\u{10123}') { print('error 2'); } let match3 = /(\ud800\udd23)x\1/u.exec('\u{10123}x\u{10123}'); if (!match3 || match3[1] !== '\u{10123}') { print('error 3'); } let match4 = /(\u{10123})x\ud800\udd23/u.exec('\u{10123}x\u{10123}'); if (!match4 || match4[1] !== '\u{10123}') { print('error 4'); } let match5 = /(\ud800)\udd23x\1/u.exec('\u{10123}x\u{10123}'); if (match5) { print('error 5'); } let match6 = /([^x])\ud800./u.exec('\ud800\ud800\udc00'); if (match6) { print('error 6'); } print('DONE'); All bots pass and the above tests pass too so I think it's fixed. I didn't recognize the problems you mentioned and debugging this for the first time turned out to be a long exercise in C++ and x86_64 assembly reading. Once again, thanks for the help on this. 1575599 11 379597 keith_miller 2019-10-01 10:48:35 -0700 Comment on attachment 379597 Updated ChangeLogs citing Paulo Matos <pmatos@igalia.com> original contribution. r=me. I'll take your word on some of the character encodings because I don't know them very well. 1575600 12 379597 keith_miller 2019-10-01 10:49:27 -0700 Comment on attachment 379597 Updated ChangeLogs citing Paulo Matos <pmatos@igalia.com> original contribution. Can you also add Paulos' test? 1575601 13 msaboff 2019-10-01 11:01:43 -0700 (In reply to Keith Miller from comment #12) > Comment on attachment 379597 [details] > Updated ChangeLogs citing Paulo Matos <pmatos@igalia.com> original > contribution. > > Can you also add Paulos' test? His test is a collection of subtests that where failing with his patch. They are already part of our existing tests. 1575610 14 msaboff 2019-10-01 11:23:56 -0700 Committed r250568: <https://trac.webkit.org/changeset/250568> 1575611 15 webkit-bug-importer 2019-10-01 11:24:24 -0700 <rdar://problem/55883253> 379547 2019-09-25 07:35:55 -0700 2019-09-25 17:24:16 -0700 WIP - Patch bug-202041-20190925163533.patch text/plain 4118 pmatos U3VidmVyc2lvbiBSZXZpc2lvbjogMjUwMzQwCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBk YTE5MDQ5YmQzMDAxZWE5YTdmZjhlMGExYzIwMjRkMzdiOTMwNzhlLi44Yjc1MmE4MTg4MjdlMzQx ZDYzMzcxNjU4NWFiMmQyMjhmNzg2MDdiIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwxNCBAQAorMjAxOS0wOS0yNSAgUGF1bG8gTWF0b3MgIDxwbWF0b3NAaWdhbGlhLmNvbT4K KworICAgICAgICBEZWNvZGUgc3Vycm9nYXRlcyB3aGVuIGppdC1tYXRjaGluZyByZWdleHAgYmFj a3JlZmVyZW5jZXMKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dp 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