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From: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
To: Stefan Beller <sbeller@google.com>
Cc: Brandon Williams <bmwill@google.com>, "git@vger.kernel.org" <git@vger.kernel.org>, Junio C Hamano <gitster@pobox.com>, 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>
Subject: Re: [PATCH 18/29] grep: catch a missing enum in switch statement
Date: Thu, 11 May 2017 22:50:30 +0200
Message-ID: <CACBZZX6-jQA3Dn1rzVcXq6=wF-VkXELQqLwEsJYH=ede1_3syw@mail.gmail.com> (raw)
In-Reply-To: <CAGZ79kb_ueU8hArtA3yvYywvawnuD0RGQBtm1=OEuQi2L0rjmA@mail.gmail.com>

On Thu, May 11, 2017 at 10:40 PM, Stefan Beller <sbeller@google.com> wrote:
> On Thu, May 11, 2017 at 1:08 PM, Brandon Williams <bmwill@google.com> wrote:
>> On 05/11, Ævar Arnfjörð Bjarmason wrote:
>>> Add a die(...) to a default case for the switch statement selecting
>>> between grep pattern types under --recurse-submodules.
>>>
>>> Normally this would be caught by -Wswitch, but the grep_pattern_type
>>> type is converted to int by going through parse_options(). Changing
>>> the argument type passed to compile_submodule_options() won't work,
>>> the value will just get coerced.
>>>
>>> Thus catching this at runtime is the least worst option. This won't
>>> ever trigger in practice, but if a new pattern type were to be added
>>> this catches an otherwise silent bug during development.
>>>
>>> See commit 0281e487fd ("grep: optionally recurse into submodules",
>>> 2016-12-16) for the initial addition of this code.
>>>
>>> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
>>> ---
>>>  builtin/grep.c | 6 ++++++
>>>  1 file changed, 6 insertions(+)
>>>
>>> diff --git a/builtin/grep.c b/builtin/grep.c
>>> index 3ffb5b4e81..1c0adb30f3 100644
>>> --- a/builtin/grep.c
>>> +++ b/builtin/grep.c
>>> @@ -495,6 +495,12 @@ static void compile_submodule_options(const struct grep_opt *opt,
>>>               break;
>>>       case GREP_PATTERN_TYPE_UNSPECIFIED:
>>>               break;
>>> +     default:
>>> +             /*
>>> +              * -Wswitch doesn't catch this due to casting &
>>> +              * -Wswitch-default is too noisy.
>>> +              */
>>> +             die("BUG: Added a new grep pattern type without updating switch statement");
>
> I am not sure if the comment is of enough value for the used screen
> real estate value.
> People interested in the existence of the default would just use
> blame/log to find out.

Thanks, I was on the fence about it, will remove it (and add the
mention of -Wswitch-default to the commit message).

  reply index

Thread overview: 61+ messages in thread (expand / mbox.gz / Atom feed / [top])
2017-05-11  9:18 [PATCH 00/29] Easy to review grep & pre-PCRE changes Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 01/29] Makefile & configure: reword inaccurate comment about PCRE Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 02/29] grep & rev-list doc: stop promising libpcre for --perl-regexp Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 03/29] test-lib: rename the LIBPCRE prerequisite to PCRE Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 04/29] log: add exhaustive tests for pattern style options & config Ævar Arnfjörð Bjarmason
2017-05-12  4:48   ` Junio C Hamano
2017-05-13 18:02     ` Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 05/29] grep: add a test asserting that --perl-regexp dies when !PCRE Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 06/29] grep: add a test for backreferences in PCRE patterns Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 07/29] grep: change non-ASCII -i test to stop using --debug Ævar Arnfjörð Bjarmason
2017-05-11 18:31   ` Brandon Williams
2017-05-11 18:35     ` Ævar Arnfjörð Bjarmason
2017-05-11 20:05       ` Brandon Williams
2017-05-11  9:18 ` [PATCH 08/29] grep: add tests for --threads=N and grep.threads Ævar Arnfjörð Bjarmason
2017-05-11 18:36   ` Brandon Williams
2017-05-11 19:22     ` Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 09/29] grep: amend submodule recursion test for regex engine testing Ævar Arnfjörð Bjarmason
2017-05-12  4:59   ` Junio C Hamano
2017-05-13 17:33     ` Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 10/29] grep: add tests for grep pattern types being passed to submodules Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 11/29] grep: add a test helper function for less verbose -f \0 tests Ævar Arnfjörð Bjarmason
2017-05-12  5:06   ` Junio C Hamano
2017-05-13 11:33     ` Ævar Arnfjörð Bjarmason
2017-05-15  1:29       ` Junio C Hamano
2017-05-11  9:18 ` [PATCH 12/29] grep: prepare for testing binary regexes containing rx metacharacters Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 13/29] grep: add tests to fix blind spots with \0 patterns Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 14/29] perf: add a GIT_PERF_MAKE_COMMAND for when *_MAKE_OPTS won't do Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 15/29] perf: emit progress output when unpacking & building Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 16/29] perf: add a performance comparison test of grep -G, -E and -P Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 17/29] perf: add a performance comparison of fixed-string grep Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 18/29] grep: catch a missing enum in switch statement Ævar Arnfjörð Bjarmason
2017-05-11 20:08   ` Brandon Williams
2017-05-11 20:40     ` Stefan Beller
2017-05-11 20:50       ` Ævar Arnfjörð Bjarmason [this message]
2017-05-11  9:18 ` [PATCH 19/29] grep: remove redundant regflags assignment under PCRE Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 20/29] grep: remove redundant `regflags &= ~REG_EXTENDED` assignments Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 21/29] grep: factor test for \0 in grep patterns into a function Ævar Arnfjörð Bjarmason
2017-05-11 20:15   ` Brandon Williams
2017-05-11 20:22     ` Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 22/29] grep: change the internal PCRE macro names to be PCRE1 Ævar Arnfjörð Bjarmason
2017-05-11 20:10   ` Brandon Williams
2017-05-11  9:18 ` [PATCH 23/29] grep: change internal *pcre* variable & function names to be *pcre1* Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 24/29] grep: move two functions to avoid forward declaration Ævar Arnfjörð Bjarmason
2017-05-11 20:14   ` Brandon Williams
2017-05-11 20:20     ` Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 25/29] test-lib: add a PTHREADS prerequisite Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 26/29] pack-objects & index-pack: add test for --threads warning Ævar Arnfjörð Bjarmason
2017-05-11 20:17   ` Brandon Williams
2017-05-11 20:34     ` Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 27/29] pack-objects: fix buggy warning about threads Ævar Arnfjörð Bjarmason
2017-05-11  9:18 ` [PATCH 28/29] grep: given --threads with NO_PTHREADS=YesPlease, warn Ævar Arnfjörð Bjarmason
2017-05-11 20:21   ` Brandon Williams
2017-05-11 20:33     ` Ævar Arnfjörð Bjarmason
2017-05-11 20:43       ` Brandon Williams
2017-05-11 21:20         ` [PATCH] C style: use standard style for "TRANSLATORS" comments Ævar Arnfjörð Bjarmason
2017-05-11 21:41           ` Jonathan Nieder
2017-05-11 21:50             ` Brandon Williams
2017-05-12  5:20           ` Johannes Sixt
2017-05-30 16:02           ` Jiang Xin
2017-05-30 23:03             ` Junio C Hamano
2017-05-11  9:18 ` [PATCH 29/29] grep: assert that threading is enabled when calling grep_{lock,unlock} Ævar Arnfjörð Bjarmason

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