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Re: [PATCH v1 3/3] xen: debug: gcov: add condition coverage support
- To: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 27 Mar 2025 09:08:42 +0100
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- Cc: 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>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 27 Mar 2025 08:08:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.03.2025 01:40, Volodymyr Babchuk wrote:
> --- a/xen/Kconfig.debug
> +++ b/xen/Kconfig.debug
> @@ -44,6 +44,15 @@ config COVERAGE
>
> If unsure, say N here.
>
> +config CONDITION_COVERAGE
> + bool "Condition coverage support"
> + depends on COVERAGE && !CC_IS_CLANG
> + help
> + Enable condition coverage support. Used for collecting MC/DC
> + (Modified Condition/Decision Coverage) metrics.
> +
> + If unsure, say N here.
> +
> config DEBUG_LOCK_PROFILE
> bool "Lock Profiling"
> select DEBUG_LOCKS
> --- a/xen/Rules.mk
> +++ b/xen/Rules.mk
> @@ -138,6 +138,9 @@ ifeq ($(CONFIG_CC_IS_CLANG),y)
> COV_FLAGS := -fprofile-instr-generate -fcoverage-mapping
> else
> COV_FLAGS := -fprofile-arcs -ftest-coverage
> +ifeq ($(CONFIG_CONDITION_COVERAGE),y)
> + COV_FLAGS += -fcondition-coverage
> +endif
> endif
>
> # Reset COV_FLAGS in cases where an objects has another one as prerequisite
> --- a/xen/common/coverage/gcc_4_7.c
> +++ b/xen/common/coverage/gcc_4_7.c
> @@ -43,6 +43,10 @@
> #define GCOV_UNIT_SIZE 4
> #endif
>
> +#if defined(CONFIG_CONDITION_COVERAGE) && (GCC_VERSION < 140100)
> +#error "GCC 14.1 or never is required to generate conditional coverage data"
> +#endif
That's too late as a check. It wants to be in Kconfig (less preferred from my
pov, should at most be influencing the default there) or the latest in the
makefile (see [1]). After all a compiler not supporting the feature will
choke already on -fcondition-coverage, and hence not even get to see this
pre-processor conditional.
Jan
[1] https://lists.xen.org/archives/html/xen-devel/2022-09/msg01793.html
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