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Re: [PATCH v2] misra: allow 'noreturn' as safe for function pointer conversions
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 29 Jul 2025 15:09:32 +0200
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- Cc: Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>, Doug Goldstein <cardoe@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 29 Jul 2025 13:09:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29.07.2025 15:02, Nicola Vetrini wrote:
> On 2025-07-29 14:39, Jan Beulich wrote:
>> On 29.07.2025 14:21, Dmytro Prokopchuk1 wrote:
>>> --- a/automation/eclair_analysis/ECLAIR/deviations.ecl
>>> +++ b/automation/eclair_analysis/ECLAIR/deviations.ecl
>>> @@ -367,6 +367,13 @@ constant expressions are required.\""
>>> }
>>> -doc_end
>>>
>>> +-doc_begin="The conversion from 'void noreturn (*)(void *)' to 'void
>>> (*)(void *)' is safe
>>> +because the semantics of the 'noreturn' attribute do not alter the
>>> calling convention or behavior of the resulting code."
>>> +-config=MC3A2.R11.1,casts+={safe,
>>> +
>>> "kind(bitcast)&&to(type(pointer(inner(return(builtin(void))&&all_param(1,
>>> pointer(builtin(void)))))))&&from(expr(skip(!syntactic(),
>>> + ref(property(noreturn)))))"}
>>> +-doc_end
>>
>> As I understand it, this is about any function, not just void (void *)
>> ones.
>> Hence throughout anything textual in this patch, may I ask that this be
>> made
>> explicit by inserting e.g. "e.g." everywhere?
>
> Technically yes, in practice other implicit function pointer conversions
> would be caught by -Wincompatible-pointer-types and similar flags so
> they don't even come into play. However I agree that adding that is
> clearer.
Perhaps a misunderstanding: With "any" I meant any which has a noreturn
attribute, when converted to one with otherwise the same signature. But
irrespective of the particular return type or parameter types (i.e.
specifically not just void (void *) ones).
Jan
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