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Re: [XEN PATCH v2 1/3] xen: introduce STATIC_ASSERT_UNREACHABLE()
- To: Federico Serafini <federico.serafini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 6 Feb 2024 14:26:54 +0100
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- Cc: consulting@xxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 06 Feb 2024 13:26:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.02.2024 14:22, Jan Beulich wrote:
> On 26.01.2024 11:05, Federico Serafini wrote:> ---
> a/xen/include/xen/compiler.h
>> +++ b/xen/include/xen/compiler.h
>> @@ -64,6 +64,13 @@
>> # define fallthrough do {} while (0) /* fallthrough */
>> #endif
>>
>> +/*
>> + * Add the following macro to check that a program point is considered
>> + * unreachable by the static analysis performed by the compiler.
>> + */
>> +#define STATIC_ASSERT_UNREACHABLE() \
>> + asm ( ".error \"static assertion failed: unreachable\"" )
>
> In the comment s/Add/Use/? The macro is there after all when this gets
> committed. Overall maybe
>
> "Use this macro at program points considered unreachable, to be checked
> by the compiler's static analysis."
>
> ?
>
> Also while asm()s without operands are implicitly volatile, I think it
> would be a good idea to make that explicit nevertheless.
>
> I'd be happy to adjust while committing, so long as you agree. If you
> agree, and provided diagnostics resulting from this are useful (an
> example would have been nice in the description):
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Actually, having seen patch 2, I need to withdraw this right away.
Jan
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