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From: Carlo Arenas <carenas@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org, cbailey32@bloomberg.net, avarab@gmail.com
Subject: Re: [PATCH 1/2] grep: make sure NO_LIBPCRE1_JIT disable JIT in PCRE1
Date: Mon, 26 Aug 2019 18:34:42 -0700	[thread overview]
Message-ID: <CAPUEspjnwbC8L+9Ni_PN5kzROh3cqxEQRrhZHG_dhiR-K25OJA@mail.gmail.com> (raw)
In-Reply-To: <xmqq36hnhi4n.fsf@gitster-ct.c.googlers.com>

On Mon, Aug 26, 2019 at 11:54 AM Junio C Hamano <gitster@pobox.com> wrote:
>
> Carlo Marcelo Arenas Belón  <carenas@gmail.com> writes:
>
> > e87de7cab4 ("grep: un-break building with PCRE < 8.32", 2017-05-25)
> > added a restriction for JIT support that is no longer needed after
> > pcre_jit_exec() calls were removed.
>
> I was initially puzzled by this statement, until I realized that the
> removal of pcre_jit_exec() happens in the topic still in flight that
> this patch builds on top of, namely 685668fa ("grep: stop using a
> custom JIT stack with PCRE v1", 2019-07-26).

sorry about that, I thought I had mentioned it in the cover letter
(since the hash is likely to change and so is not fit for a commit
message) but it is not there either.

how could this be tracked more effectively?

> So the logic is that because we do no longer call pcre_jit_exec()
> that weren't available between 8.20 and 8.32, these slightly older
> versions can now do JIT just like the ones post 8.32?

exactly; but also because it is no longer using the JIT fast path
which skipped UTF-8 validation, will need a way to disable that or
risk a regression as I mentioned in [1]

was planning in proposing a fix for PCRE1 based on [2] but wasn't sure
if it could be part of this series, an independent one that is also
based on ab/pcre-jit-fixes, and like this one, is mostly a consequence
of 685668fa ("grep: stop using a custom JIT stack with PCRE v1",
2019-07-26) or something else, specially considering that Ævar
dismissed it as a non issue in his commit message.

Carlo

[1] https://public-inbox.org/git/CAPUEspj4BJLjXorUXMiZnFtNcmhym_2QL5GUqeaGaCoxk=zjtw@mail.gmail.com/T/#m6acc8f68c398951457da469530bafa7e18811366
[2] https://public-inbox.org/git/20190721183115.14985-1-carenas@gmail.com/

  reply	other threads:[~2019-08-27  1:34 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-25 18:22 [PATCH 0/2] PCRE1 cleanup Carlo Marcelo Arenas Belón
2019-08-25 18:22 ` [PATCH 1/2] grep: make sure NO_LIBPCRE1_JIT disable JIT in PCRE1 Carlo Marcelo Arenas Belón
2019-08-26 18:54   ` Junio C Hamano
2019-08-27  1:34     ` Carlo Arenas [this message]
2019-08-25 18:22 ` [PATCH 2/2] grep: refactor and simplify PCRE1 support Carlo Marcelo Arenas Belón
2019-08-26 18:57   ` Junio C Hamano

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