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Re: [PATCH v2] misra: allow 'noreturn' as safe for function pointer conversions
- To: Dmytro Prokopchuk1 <dmytro_prokopchuk1@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 29 Jul 2025 14:39:22 +0200
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- Cc: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, 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" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 29 Jul 2025 12:39:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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?
I'm also on the edge of complaining again about the patch subject, as that's
still not quite accurate: It's only one direction in which things are safe.
Jan
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