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From: Junio C Hamano <gitster@pobox.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Carlo Arenas <carenas@gmail.com>,
	git@vger.kernel.org, Beat Bolli <dev+git@drbeat.li>,
	Johannes Schindelin <Johannes.Schindelin@gmx.de>
Subject: Re: [PATCH v2 4/8] grep: consistently use "p->fixed" in compile_regexp()
Date: Mon, 29 Jul 2019 09:23:20 -0700	[thread overview]
Message-ID: <xmqqlfwgvmh3.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <87zhkx5hlj.fsf@evledraar.gmail.com> (=?utf-8?B?IsOGdmFyIEFy?= =?utf-8?B?bmZqw7Zyw7A=?= Bjarmason"'s message of "Mon, 29 Jul 2019 11:13:12 +0200")

Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:

>> The reason we ignore the user's choice here is because you might
>> e.g. set grep.patternType=extended in your config, and you'd still want
>> grepping for a fixed "foo" to be fast.
>
> ...and more generally, for any future sanity of implementation and
> maintenance I think we should only make the promise that we support
> certain syntax & semantics, not that the -F, -G, -E, -P options are
> guaranteed to dispatch to a given codepath.
>
> Internally we should be free to switch between those, so e.g. if a
> pattern is fixed and you configure "basic" regexp, but we know your C
> library is faster for those matches with REG_EXTENDED we should just
> pass that regardless of -G or -E.

That certainly is a very sensible goal.

> I'm just saying that the presence of those bugs means we should be
> inclined to fix them / back out certain changes, not work around them
> with user-servicable knobs.

Amen.

  reply	other threads:[~2019-07-29 16:23 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-21 19:40 [PATCH] grep: use custom JIT stack with pcre2 Carlo Marcelo Arenas Belón
2019-07-24 15:14 ` [PATCH 0/3] grep: PCRE JIT fixes Ævar Arnfjörð Bjarmason
2019-07-24 16:18   ` Junio C Hamano
2019-07-24 20:03     ` Ævar Arnfjörð Bjarmason
2019-07-26 15:08   ` [PATCH v2 0/8] grep: PCRE JIT fixes + ab/no-kwset fix Ævar Arnfjörð Bjarmason
2019-07-26 20:27     ` Junio C Hamano
2019-07-29  9:20       ` Ævar Arnfjörð Bjarmason
2019-07-29 16:12         ` Junio C Hamano
2019-07-26 15:08   ` [PATCH v2 1/8] grep: remove overly paranoid BUG(...) code Ævar Arnfjörð Bjarmason
2019-07-26 15:08   ` [PATCH v2 2/8] grep: stop "using" a custom JIT stack with PCRE v2 Ævar Arnfjörð Bjarmason
2019-07-29  0:33     ` Carlo Arenas
2019-07-26 15:08   ` [PATCH v2 3/8] grep: stop using a custom JIT stack with PCRE v1 Ævar Arnfjörð Bjarmason
2019-07-29  1:26     ` Carlo Arenas
2019-07-26 15:08   ` [PATCH v2 4/8] grep: consistently use "p->fixed" in compile_regexp() Ævar Arnfjörð Bjarmason
2019-07-29  1:48     ` Carlo Arenas
2019-07-29  9:05       ` Ævar Arnfjörð Bjarmason
2019-07-29  9:13         ` Ævar Arnfjörð Bjarmason
2019-07-29 16:23           ` Junio C Hamano [this message]
2019-07-26 15:08   ` [PATCH v2 5/8] grep: create a "is_fixed" member in "grep_pat" Ævar Arnfjörð Bjarmason
2019-07-26 15:08   ` [PATCH v2 6/8] grep: stess test PCRE v2 on invalid UTF-8 data Ævar Arnfjörð Bjarmason
2019-07-26 20:34     ` Junio C Hamano
2019-07-26 21:55       ` Ævar Arnfjörð Bjarmason
2019-07-29  3:06     ` Carlo Arenas
2019-11-26 21:50     ` [PATCH] t7812: add missing redirects Andreas Schwab
2019-11-26 22:27       ` Johannes Schindelin
2019-11-26 23:11         ` Andreas Schwab
2019-11-27 11:58           ` Jeff King
2019-11-30  0:46       ` [PATCH] t7812: expect failure for grep -i with invalid UTF-8 data Todd Zullinger
2019-11-30  8:00         ` Andreas Schwab
2019-12-01 16:33           ` Junio C Hamano
2019-12-01 17:09             ` Andreas Schwab
2019-12-01 18:32             ` Todd Zullinger
2019-12-02  6:13               ` Junio C Hamano
2019-07-26 15:08   ` [PATCH v2 7/8] grep: do not enter PCRE2_UTF mode on fixed matching Ævar Arnfjörð Bjarmason
2019-07-26 20:36     ` Junio C Hamano
2019-07-26 15:08   ` [PATCH v2 8/8] grep: optimistically use PCRE2_MATCH_INVALID_UTF Ævar Arnfjörð Bjarmason
2019-07-26 21:07     ` Junio C Hamano
2019-07-26 21:53       ` Ævar Arnfjörð Bjarmason
2019-07-26 21:57         ` Ævar Arnfjörð Bjarmason
2021-01-24  2:12     ` [PATCH v3 0/4] grep: better support invalid UTF-8 haystacks Ævar Arnfjörð Bjarmason
2021-01-24 11:48       ` [PATCH v4 0/2] " Ævar Arnfjörð Bjarmason
2021-01-24 17:28         ` [PATCH v5 " Ævar Arnfjörð Bjarmason
2021-01-24 17:28         ` [PATCH v5 1/2] grep/pcre2 tests: don't rely on invalid UTF-8 data test Ævar Arnfjörð Bjarmason
2021-01-24 17:28         ` [PATCH v5 2/2] grep/pcre2: better support invalid UTF-8 haystacks Ævar Arnfjörð Bjarmason
2021-01-24 11:48       ` [PATCH v4 1/2] grep/pcre2 tests: don't rely on invalid UTF-8 data test Ævar Arnfjörð Bjarmason
2021-01-24 11:48       ` [PATCH v4 2/2] grep/pcre2: better support invalid UTF-8 haystacks Ævar Arnfjörð Bjarmason
2021-01-24 13:53         ` Ramsay Jones
2021-01-24 14:24           ` Ramsay Jones
2021-01-24 14:49             ` Ævar Arnfjörð Bjarmason
2021-01-24 16:10               ` Ramsay Jones
2021-01-24 17:29                 ` Ævar Arnfjörð Bjarmason
2021-01-24  2:12     ` [PATCH v3 1/4] grep/pcre2 tests: don't rely on invalid UTF-8 data test Ævar Arnfjörð Bjarmason
2021-01-24  2:12     ` [PATCH v3 2/4] grep/pcre2: simplify boolean spaghetti Ævar Arnfjörð Bjarmason
2021-01-24  5:33       ` Junio C Hamano
2021-01-24 10:45         ` Johannes Sixt
2021-01-24  2:12     ` [PATCH v3 3/4] grep/pcre2: further " Ævar Arnfjörð Bjarmason
2021-01-24  2:12     ` [PATCH v3 4/4] grep/pcre2: better support invalid UTF-8 haystacks Ævar Arnfjörð Bjarmason
2019-07-24 15:14 ` [PATCH 1/3] grep: remove overly paranoid BUG(...) code Ævar Arnfjörð Bjarmason
2019-07-24 15:14 ` [PATCH 2/3] grep: stop "using" a custom JIT stack with PCRE v2 Ævar Arnfjörð Bjarmason
2019-07-24 16:24   ` Junio C Hamano
2019-07-24 20:06     ` Ævar Arnfjörð Bjarmason
2019-07-25  5:11       ` Carlo Arenas
2019-07-24 15:14 ` [PATCH 3/3] grep: stop using a custom JIT stack with PCRE v1 Ævar Arnfjörð Bjarmason
2019-07-26 13:15   ` Carlo Arenas
2019-07-26 13:50     ` Ævar Arnfjörð Bjarmason
2019-07-26 14:12       ` Carlo Arenas
2019-07-26 14:43         ` Ævar Arnfjörð Bjarmason
2019-07-26 20:26           ` [RFC PATCH 0/2] PCRE1 cleanup Carlo Marcelo Arenas Belón
2019-07-26 20:26             ` [RFC PATCH 1/2] grep: make sure NO_LIBPCRE1_JIT disable JIT in PCRE1 Carlo Marcelo Arenas Belón
2019-07-26 20:26             ` [RFC PATCH 2/2] grep: refactor and simplify PCRE1 support Carlo Marcelo Arenas Belón

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