From: Tomi Ollila <tomi.ollila@iki.fi>
To: Austin Clements <amdragon@MIT.EDU>,
Justus Winter <4winter@informatik.uni-hamburg.de>
Cc: notmuch@notmuchmail.org
Subject: Re: [PATCH 1/2] Annotate internal_error with the attribute noreturn
Date: Sat, 22 Sep 2012 23:03:40 +0300 [thread overview]
Message-ID: <m2a9whlt9f.fsf@guru.guru-group.fi> (raw)
In-Reply-To: <20120922161256.GE26662@mit.edu>
On Sat, Sep 22 2012, Austin Clements wrote:
> LGTM, though I agree with David that this should return void now, if
> that's possible.
>
> Do we want to wrap the __attribute__((noreturn)) in an #ifdef __GNUC__
> (or provide a PRINTF_ATTRIBUTE-like macro) or is that already a lost
> cause?
Good point -- this should be NORETURN_ATTRIBUTE instead...
Also, http://gcc.gnu.org/onlinedocs/gcc-4.3.2//gcc/Function-Attributes.html states:
"It does not make sense for a noreturn function to have a return type other
than void."
(I think that hasn't changed since :)
Tomi
>
> Quoth Justus Winter on Sep 21 at 2:50 pm:
>> Annotating functions that do not return with the noreturn attribute
>> (which is understood by both gcc and clang) prevents static analyzers
>> from generating false positives (internal_error is used to terminate
>> the process and is used extensively in error handling code paths).
>>
>> Remove the return statement that was placed there to appease the
>> compiler. Functions annotated with noreturn are not supposed to return
>> any values.
>>
>> Signed-off-by: Justus Winter <4winter@informatik.uni-hamburg.de>
>> ---
>> util/error_util.c | 2 --
>> util/error_util.h | 2 +-
>> 2 files changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/util/error_util.c b/util/error_util.c
>> index 630d228..3cf353a 100644
>> --- a/util/error_util.c
>> +++ b/util/error_util.c
>> @@ -35,7 +35,5 @@ _internal_error (const char *format, ...)
>> vfprintf (stderr, format, va_args);
>>
>> exit (1);
>> -
>> - return 1;
>> }
>>
>> diff --git a/util/error_util.h b/util/error_util.h
>> index bb15822..24a644b 100644
>> --- a/util/error_util.h
>> +++ b/util/error_util.h
>> @@ -30,7 +30,7 @@
>> * Note that PRINTF_ATTRIBUTE comes from talloc.h
>> */
>> int
>> -_internal_error (const char *format, ...) PRINTF_ATTRIBUTE (1, 2);
>> +_internal_error (const char *format, ...) PRINTF_ATTRIBUTE (1, 2) __attribute__ ((noreturn));
>>
>> /* There's no point in continuing when we've detected that we've done
>> * something wrong internally (as opposed to the user passing in a
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next prev parent reply other threads:[~2012-09-22 20:03 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-21 12:50 [PATCH 1/2] Annotate internal_error with the attribute noreturn Justus Winter
2012-09-21 12:50 ` [PATCH 2/2] Avoid potentially dereferencing a NULL pointer Justus Winter
2012-09-22 16:19 ` Austin Clements
2012-09-24 12:55 ` Justus Winter
2012-09-21 20:31 ` [PATCH 1/2] Annotate internal_error with the attribute noreturn David Bremner
2012-09-22 16:12 ` Austin Clements
2012-09-22 20:03 ` Tomi Ollila [this message]
2012-09-24 10:31 ` RFC: Annotate internal_error with the attribute noreturn 2nd patchset Justus Winter
2012-09-24 10:31 ` [PATCH 1/5] RFC: Provide a __has_attribute compatibility macro Justus Winter
2012-09-24 10:31 ` [PATCH 2/5] RFC: Provide a NORETURN_ATTRIBUTE macro similar to PRINTF_ATTRIBUTE Justus Winter
2012-09-24 10:31 ` [PATCH 3/5] Fix the COERCE_STATUS macro Justus Winter
2012-09-24 10:31 ` [PATCH 4/5] Annotate internal_error with the attribute noreturn Justus Winter
2012-09-24 10:31 ` [PATCH 5/5] Avoid potentially dereferencing a NULL pointer Justus Winter
2012-09-24 10:44 ` RFC: Annotate internal_error with the attribute noreturn 2nd patchset David Bremner
2012-09-24 12:50 ` Justus Winter
2012-09-24 14:41 ` David Bremner
2012-09-24 15:21 ` [PATCH 1/6] Provide a __has_attribute compatibility macro Justus Winter
2012-09-24 15:21 ` [PATCH 2/6] Provide a NORETURN_ATTRIBUTE macro similar to PRINTF_ATTRIBUTE Justus Winter
2012-09-24 15:21 ` [PATCH 3/6] Extend compat/README Justus Winter
2012-09-24 15:21 ` [PATCH 4/6] Fix the COERCE_STATUS macro Justus Winter
2012-09-24 17:44 ` Austin Clements
2012-09-25 8:55 ` Tomi Ollila
2012-09-24 15:21 ` [PATCH 5/6] Annotate internal_error with the attribute noreturn Justus Winter
2012-09-24 15:21 ` [PATCH 6/6] Avoid potentially dereferencing a NULL pointer Justus Winter
2012-09-27 15:57 ` [PATCH 1/6] Provide a __has_attribute compatibility macro David Bremner
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