From: Junio C Hamano <gitster@pobox.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: 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 18/29] grep: catch a missing enum in switch statement
Date: Mon, 15 May 2017 14:50:29 +0900 [thread overview]
Message-ID: <xmqqwp9ivfbu.fsf@gitster.mtv.corp.google.com> (raw)
In-Reply-To: <20170513231509.7834-19-avarab@gmail.com> ("Ævar Arnfjörð Bjarmason"'s message of "Sat, 13 May 2017 23:14:58 +0000")
Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
> 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. The -Wswitch-default warning will
> warn about it, but that produces a lot of noise across the codebase,
> this potential issue would be drowned in that noise.
>
> Thus catching this at runtime is the least worst option. This won't
least bad, I guess?
> ever trigger in practice, but if a new pattern type were to be added
> this catches an otherwise silent bug during development.
Good future-proofing. When this and Peff's "BUG" thing both
graduates, we can turn this into a BUG, I think.
Thanks.
>
> 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 | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/builtin/grep.c b/builtin/grep.c
> index 3ffb5b4e81..a191e2976b 100644
> --- a/builtin/grep.c
> +++ b/builtin/grep.c
> @@ -495,6 +495,8 @@ static void compile_submodule_options(const struct grep_opt *opt,
> break;
> case GREP_PATTERN_TYPE_UNSPECIFIED:
> break;
> + default:
> + die("BUG: Added a new grep pattern type without updating switch statement");
> }
>
> for (pattern = opt->pattern_list; pattern != NULL;
next prev parent reply other threads:[~2017-05-15 5:50 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 [this message]
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
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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