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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 14:22:30 +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 13:22:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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>
Jan
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