From: Jeff King <peff@peff.net>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: "Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>,
git@vger.kernel.org, "Junio C Hamano" <gitster@pobox.com>,
"Johannes Schindelin" <johannes.schindelin@gmx.de>,
"SZEDER Gábor" <szeder.dev@gmail.com>,
git-packagers@googlegroups.com
Subject: Re: Can we just get rid of kwset & obstack in favor of optimistically using PCRE v2 JIT?
Date: Thu, 20 Jun 2019 06:35:31 -0400 [thread overview]
Message-ID: <20190620103530.GA15700@sigill.intra.peff.net> (raw)
In-Reply-To: <87tvcr92m2.fsf@evledraar.gmail.com>
On Sat, Jun 15, 2019 at 01:19:33AM +0200, Ævar Arnfjörð Bjarmason wrote:
> ...small correction, we currently hard-rely on kwset() for any pattern
> containing a \0 for "git-grep" (these can only by supplied via the -f
> <pattern-from-file> option), this means that any pattern containing a \0
> is implicitly fixed, unless kwset() doesn't like it (-i and non-ASCII),
> what a mess.
>
> Since we hard depend on REG_STARTEND since 2f8952250a ("regex: add
> regexec_buf() that can work on a non NUL-terminated string", 2016-09-21)
> we should just fix that while we're at it. It's a backwards-incompatible
> change, but I doubt anyone is relying on our undocumented behavior of
> implicitly considering grep patterns with \0 in them always fixed.
That's only for NULs in the haystack, though. I don't think there's a
way to have a NUL in the pattern with regcomp(), since it takes a
NUL-terminated string.
I do agree with you that treating it like a fixed string is somewhat
insane. We're probably better off to die.
In general, your plan to get rid of kwset sounds like a good path. It
would be a slight regression for somebody who is truly feeding a
fixed-string pattern with a NUL in it, on a system without pcre. Right
now that works (via kwset), and if we would start feeding fixed strings
to regcomp() then obviously that won't work. I guess we could go back to
using memmem as a fallback, which is what it looks like we used before
9eceddeec6 (Use kwset in grep, 2011-08-21).
Seems like a code path that would get exercised approximately never,
though.
-Peff
next prev parent reply other threads:[~2019-06-20 10:35 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-13 11:49 [PATCH 0/4] Support building with GCC v8.x/v9.x Johannes Schindelin via GitGitGadget
2019-06-13 11:49 ` [PATCH 1/4] poll (mingw): allow compiling with GCC 8 and DEVELOPER=1 Johannes Schindelin via GitGitGadget
2019-06-13 11:49 ` [PATCH 2/4] kwset: allow building with GCC 8 Johannes Schindelin via GitGitGadget
2019-06-13 16:11 ` Junio C Hamano
2019-06-14 9:53 ` SZEDER Gábor
2019-06-14 10:00 ` [RFC/PATCH v1 0/4] compat/obstack: update from upstream SZEDER Gábor
2019-06-14 10:00 ` [PATCH v1 1/4] " SZEDER Gábor
2019-06-14 10:00 ` [PATCH v1 2/4] SQUASH??? compat/obstack: fix portability issues SZEDER Gábor
2019-06-14 10:00 ` [PATCH v1 3/4] SQUASH??? compat/obstack: fix build errors with Clang SZEDER Gábor
2019-06-14 10:00 ` [PATCH v1 4/4] compat/obstack: fix some sparse warnings SZEDER Gábor
2019-06-14 17:57 ` [RFC/PATCH v1 0/4] compat/obstack: update from upstream Jeff King
2019-06-14 18:19 ` Junio C Hamano
2019-06-14 20:30 ` Ramsay Jones
2019-06-14 21:24 ` Ramsay Jones
2019-06-17 18:36 ` SZEDER Gábor
2019-06-14 16:12 ` [PATCH 2/4] kwset: allow building with GCC 8 Junio C Hamano
2019-06-17 18:26 ` SZEDER Gábor
2019-06-14 22:09 ` Ævar Arnfjörð Bjarmason
2019-06-14 22:55 ` Can we just get rid of kwset & obstack in favor of optimistically using PCRE v2 JIT? Ævar Arnfjörð Bjarmason
2019-06-14 23:19 ` Ævar Arnfjörð Bjarmason
2019-06-20 10:35 ` Jeff King [this message]
2019-06-15 9:01 ` Carlo Arenas
2019-06-15 19:15 ` brian m. carlson
2019-06-15 22:14 ` Ævar Arnfjörð Bjarmason
2019-06-26 0:03 ` [RFC/PATCH 0/7] grep: move from kwset to optional PCRE v2 Ævar Arnfjörð Bjarmason
2019-06-26 14:02 ` Johannes Schindelin
2019-06-27 9:16 ` Johannes Schindelin
2019-06-27 16:27 ` Ævar Arnfjörð Bjarmason
2019-06-27 18:21 ` Johannes Schindelin
2019-06-27 23:39 ` [PATCH v2 0/9] " Ævar Arnfjörð Bjarmason
2019-06-28 7:23 ` Ævar Arnfjörð Bjarmason
2019-06-28 16:10 ` Junio C Hamano
2019-07-01 21:20 ` [PATCH v3 00/10] " Ævar Arnfjörð Bjarmason
2019-07-01 21:31 ` Junio C Hamano
2019-07-02 11:10 ` Ævar Arnfjörð Bjarmason
2019-07-02 12:32 ` Johannes Schindelin
2019-07-02 19:57 ` Junio C Hamano
2019-07-03 10:08 ` Johannes Schindelin
2019-07-03 10:25 ` Johannes Schindelin
2019-07-03 11:27 ` Johannes Schindelin
2019-07-01 21:20 ` [PATCH v3 01/10] log tests: test regex backends in "--encode=<enc>" tests Ævar Arnfjörð Bjarmason
2019-07-01 21:20 ` [PATCH v3 02/10] grep: don't use PCRE2?_UTF8 with "log --encoding=<non-utf8>" Ævar Arnfjörð Bjarmason
2019-07-01 21:20 ` [PATCH v3 03/10] t4210: skip more command-line encoding tests on MinGW Ævar Arnfjörð Bjarmason
2019-07-01 21:20 ` [PATCH v3 04/10] grep: inline the return value of a function call used only once Ævar Arnfjörð Bjarmason
2019-07-01 21:20 ` [PATCH v3 05/10] grep tests: move "grep binary" alongside the rest Ævar Arnfjörð Bjarmason
2019-07-01 21:20 ` [PATCH v3 06/10] grep tests: move binary pattern tests into their own file Ævar Arnfjörð Bjarmason
2019-07-01 21:20 ` [PATCH v3 07/10] grep: make the behavior for NUL-byte in patterns sane Ævar Arnfjörð Bjarmason
2019-07-01 21:20 ` [PATCH v3 08/10] grep: drop support for \0 in --fixed-strings <pattern> Ævar Arnfjörð Bjarmason
2019-07-01 21:20 ` [PATCH v3 09/10] grep: remove the kwset optimization Ævar Arnfjörð Bjarmason
2019-07-01 21:21 ` [PATCH v3 10/10] grep: use PCRE v2 for optimized fixed-string search Ævar Arnfjörð Bjarmason
2019-06-27 23:39 ` [PATCH v2 1/9] log tests: test regex backends in "--encode=<enc>" tests Ævar Arnfjörð Bjarmason
2019-06-27 23:39 ` [PATCH v2 2/9] grep: don't use PCRE2?_UTF8 with "log --encoding=<non-utf8>" Ævar Arnfjörð Bjarmason
2019-06-27 23:39 ` [PATCH v2 3/9] grep: inline the return value of a function call used only once Ævar Arnfjörð Bjarmason
2019-06-27 23:39 ` [PATCH v2 4/9] grep tests: move "grep binary" alongside the rest Ævar Arnfjörð Bjarmason
2019-06-27 23:39 ` [PATCH v2 5/9] grep tests: move binary pattern tests into their own file Ævar Arnfjörð Bjarmason
2019-06-27 23:39 ` [PATCH v2 6/9] grep: make the behavior for NUL-byte in patterns sane Ævar Arnfjörð Bjarmason
2019-06-27 23:39 ` [PATCH v2 7/9] grep: drop support for \0 in --fixed-strings <pattern> Ævar Arnfjörð Bjarmason
2019-06-27 23:39 ` [PATCH v2 8/9] grep: remove the kwset optimization Ævar Arnfjörð Bjarmason
2019-06-27 23:39 ` [PATCH v2 9/9] grep: use PCRE v2 for optimized fixed-string search Ævar Arnfjörð Bjarmason
2019-06-26 0:03 ` [RFC/PATCH 1/7] grep: inline the return value of a function call used only once Ævar Arnfjörð Bjarmason
2019-06-26 0:03 ` [RFC/PATCH 2/7] grep tests: move "grep binary" alongside the rest Ævar Arnfjörð Bjarmason
2019-06-26 14:05 ` Johannes Schindelin
2019-06-26 18:13 ` Junio C Hamano
2019-06-26 0:03 ` [RFC/PATCH 3/7] grep tests: move binary pattern tests into their own file Ævar Arnfjörð Bjarmason
2019-06-26 0:03 ` [RFC/PATCH 4/7] grep: make the behavior for \0 in patterns sane Ævar Arnfjörð Bjarmason
2019-06-27 2:03 ` brian m. carlson
2019-06-26 0:03 ` [RFC/PATCH 5/7] grep: drop support for \0 in --fixed-strings <pattern> Ævar Arnfjörð Bjarmason
2019-06-26 16:14 ` Junio C Hamano
2019-06-26 0:03 ` [RFC/PATCH 6/7] grep: remove the kwset optimization Ævar Arnfjörð Bjarmason
2019-06-26 0:03 ` [RFC/PATCH 7/7] grep: use PCRE v2 for optimized fixed-string search Ævar Arnfjörð Bjarmason
2019-06-26 14:13 ` Johannes Schindelin
2019-06-26 18:45 ` Junio C Hamano
2019-06-27 9:31 ` Johannes Schindelin
2019-06-27 18:45 ` Johannes Schindelin
2019-06-27 19:06 ` Junio C Hamano
2019-06-28 10:56 ` Johannes Schindelin
2019-06-13 11:49 ` [PATCH 3/4] winansi: simplify loading the GetCurrentConsoleFontEx() function Johannes Schindelin via GitGitGadget
2019-06-13 11:49 ` [PATCH 4/4] config: avoid calling `labs()` on too-large data type Johannes Schindelin via GitGitGadget
2019-06-13 16:13 ` Junio C Hamano
2019-06-16 6:48 ` René Scharfe
2019-06-16 8:24 ` René Scharfe
2019-06-16 14:01 ` René Scharfe
2019-06-16 22:26 ` Junio C Hamano
2019-06-20 19:58 ` René Scharfe
2019-06-20 21:07 ` Junio C Hamano
2019-06-21 18:35 ` Johannes Schindelin
2019-06-22 10:03 ` René Scharfe
2019-06-22 10:03 ` [PATCH v2 1/3] config: use unsigned_mult_overflows to check for overflows René Scharfe
2019-06-22 10:03 ` [PATCH v2 2/3] config: don't multiply in parse_unit_factor() René Scharfe
2019-06-22 10:03 ` [PATCH v2 3/3] config: simplify parsing of unit factors René Scharfe
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