From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Git Mailing List" <git@vger.kernel.org>,
"Jeff King" <peff@peff.net>,
"Jeffrey Walton" <noloader@gmail.com>,
"Michał Kiedrowicz" <michal.kiedrowicz@gmail.com>,
"J Smith" <dark.panda@gmail.com>,
"Victor Leschuk" <vleschuk@gmail.com>,
"Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>,
"Fredrik Kuivinen" <frekui@gmail.com>,
"Brandon Williams" <bmwill@google.com>,
"Stefan Beller" <sbeller@google.com>,
"Johannes Schindelin" <johannes.schindelin@gmx.de>
Subject: Re: [PATCH v2 20/29] grep: remove redundant `regflags &= ~REG_EXTENDED` assignments
Date: Mon, 15 May 2017 19:41:41 +0200 [thread overview]
Message-ID: <CACBZZX5jRVtJd8wj93TGS4mcE=9qaxwQjmJQqNkcxuRkJ9fXaQ@mail.gmail.com> (raw)
In-Reply-To: <xmqqshk6ve8k.fsf@gitster.mtv.corp.google.com>
On Mon, May 15, 2017 at 8:14 AM, Junio C Hamano <gitster@pobox.com> wrote:
> Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
>
>> Remove redundant assignments to the "regflags" variable. There are no
>> code paths that have previously set the regflags to anything, and
>> certainly not to `|= REG_EXTENDED`.
>>
>> This code gave the impression that it had to reset its environment,
>> but it doesn't. This dates back to the initial introduction of
>> git-grep in commit 5010cb5fcc ("built-in "git grep"", 2006-04-30).
>
> Back in 5010cb5fcc, we did do "opt.regflags &= ~REG_EXTENDED" upon
> seeing "-G" on the command line and flipped the bit on upon seeing
> "-E", but I think that was perfectly sensible and it would have been
> a bug if we didn't. They were part of the command line parsing that
> could have seen "-E" on the command line earlier.
>
> If we want to find a commit to assign blame to, I think it is more
> correct to say that this came from the same one as 19/29 fixes.
>
> When cca2c172 ("git-grep: do not die upon -F/-P when
> grep.extendedRegexp is set.", 2011-05-09) switched the command line
> parsing to "read into a 'tentatively this is what we saw the last'
> variable and then finally commit just once", we didn't touch
> opt.regflags for PCRE and FIXED, but we still had to flip regflags
> between BRE and ERE, because parsing of grep.extendedregexp
> configuration variable directly touched opt.regflags back then,
> which was done by b22520a3 ("grep: allow -E and -n to be turned on
> by default via configuration", 2011-03-30). When 84befcd0 ("grep:
> add a grep.patternType configuration setting", 2012-08-03)
> introduced extended_regexp_option field, we stopped flipping
> regflags while reading the configuration, and that was when we
> should have noticed and stopped dropping REG_EXTENDED bit in the
> "now we can commit what type to use" helper function.
Thanks for the history. I'll amend the commit message to note this.
> In any case, I think this change is safe to do in the current
> codebase. I wonder if this and 19/29 should be a single patch,
> though, as the unnecessary bit-flipping all are blamed to the same
> origin.
Squashing these two makes sense. I'll do that.
>> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
>> ---
>> grep.c | 5 +----
>> 1 file changed, 1 insertion(+), 4 deletions(-)
>>
>> diff --git a/grep.c b/grep.c
>> index 59ae7809f2..bf6c2494fd 100644
>> --- a/grep.c
>> +++ b/grep.c
>> @@ -179,7 +179,6 @@ static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, st
>> case GREP_PATTERN_TYPE_BRE:
>> opt->fixed = 0;
>> opt->pcre = 0;
>> - opt->regflags &= ~REG_EXTENDED;
>> break;
>>
>> case GREP_PATTERN_TYPE_ERE:
>> @@ -191,7 +190,6 @@ static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, st
>> case GREP_PATTERN_TYPE_FIXED:
>> opt->fixed = 1;
>> opt->pcre = 0;
>> - opt->regflags &= ~REG_EXTENDED;
>> break;
>>
>> case GREP_PATTERN_TYPE_PCRE:
>> @@ -414,10 +412,9 @@ static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
>> {
>> struct strbuf sb = STRBUF_INIT;
>> int err;
>> - int regflags;
>> + int regflags = opt->regflags;
>>
>> basic_regex_quote_buf(&sb, p->pattern);
>> - regflags = opt->regflags & ~REG_EXTENDED;
>> if (opt->ignore_case)
>> regflags |= REG_ICASE;
>> err = regcomp(&p->regexp, sb.buf, regflags);
next prev parent reply other threads:[~2017-05-15 17:42 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-13 23:14 [PATCH v2 00/29] Easy to review grep & pre-PCRE changes Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 01/29] Makefile & configure: reword inaccurate comment about PCRE Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 02/29] grep & rev-list doc: stop promising libpcre for --perl-regexp Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 03/29] test-lib: rename the LIBPCRE prerequisite to PCRE Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 04/29] log: add exhaustive tests for pattern style options & config Ævar Arnfjörð Bjarmason
2017-05-15 4:57 ` Junio C Hamano
2017-05-15 17:38 ` Ævar Arnfjörð Bjarmason
2017-05-16 0:50 ` Junio C Hamano
2017-05-13 23:14 ` [PATCH v2 05/29] grep: add a test asserting that --perl-regexp dies when !PCRE Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 06/29] grep: add a test for backreferences in PCRE patterns Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 07/29] grep: change non-ASCII -i test to stop using --debug Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 08/29] grep: add tests for --threads=N and grep.threads Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 09/29] grep: amend submodule recursion test for regex engine testing Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 10/29] grep: add tests for grep pattern types being passed to submodules Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 11/29] grep: add a test helper function for less verbose -f \0 tests Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 12/29] grep: prepare for testing binary regexes containing rx metacharacters Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 13/29] grep: add tests to fix blind spots with \0 patterns Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 14/29] perf: add a GIT_PERF_MAKE_COMMAND for when *_MAKE_OPTS won't do Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 15/29] perf: emit progress output when unpacking & building Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 16/29] perf: add a performance comparison test of grep -G, -E and -P Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 17/29] perf: add a performance comparison of fixed-string grep Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 18/29] grep: catch a missing enum in switch statement Ævar Arnfjörð Bjarmason
2017-05-15 5:50 ` Junio C Hamano
2017-05-15 17:39 ` Ævar Arnfjörð Bjarmason
2017-05-13 23:14 ` [PATCH v2 19/29] grep: remove redundant regflags assignment under PCRE Ævar Arnfjörð Bjarmason
2017-05-13 23:15 ` [PATCH v2 20/29] grep: remove redundant `regflags &= ~REG_EXTENDED` assignments Ævar Arnfjörð Bjarmason
2017-05-15 6:14 ` Junio C Hamano
2017-05-15 17:41 ` Ævar Arnfjörð Bjarmason [this message]
2017-05-13 23:15 ` [PATCH v2 21/29] grep: factor test for \0 in grep patterns into a function Ævar Arnfjörð Bjarmason
2017-05-15 6:24 ` Junio C Hamano
2017-05-15 18:07 ` Ævar Arnfjörð Bjarmason
2017-05-13 23:15 ` [PATCH v2 22/29] grep: change the internal PCRE macro names to be PCRE1 Ævar Arnfjörð Bjarmason
2017-05-13 23:15 ` [PATCH v2 23/29] grep: change internal *pcre* variable & function names to be *pcre1* Ævar Arnfjörð Bjarmason
2017-05-13 23:15 ` [PATCH v2 24/29] grep: move is_fixed() earlier to avoid forward declaration Ævar Arnfjörð Bjarmason
2017-05-13 23:15 ` [PATCH v2 25/29] test-lib: add a PTHREADS prerequisite Ævar Arnfjörð Bjarmason
2017-05-13 23:15 ` [PATCH v2 26/29] pack-objects & index-pack: add test for --threads warning Ævar Arnfjörð Bjarmason
2017-05-13 23:15 ` [PATCH v2 27/29] pack-objects: fix buggy warning about threads Ævar Arnfjörð Bjarmason
2017-05-15 8:59 ` Junio C Hamano
2017-05-15 17:16 ` Ævar Arnfjörð Bjarmason
2017-05-13 23:15 ` [PATCH v2 28/29] grep: given --threads with NO_PTHREADS=YesPlease, warn Ævar Arnfjörð Bjarmason
2017-05-13 23:15 ` [PATCH v2 29/29] grep: assert that threading is enabled when calling grep_{lock,unlock} Ævar Arnfjörð Bjarmason
2017-05-15 9:09 ` [PATCH v2 00/29] Easy to review grep & pre-PCRE changes Junio C Hamano
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