[Mesa-dev] [PATCH 1/5] mesa: add STATIC_ASSERT() macro for compile-time assertions

[Brian Paul]

There's really only two patches in this series, not five.

-Brian

On 11/28/2011 06:15 PM, Brian Paul wrote:
> This can be used to check that tables have the right number of entries,
> etc. at compile-time.  This will hopefully catch things that are missed
> if particular drivers aren't tested, for example.
> ---
>   src/mesa/main/compiler.h |   11 +++++++++++
>   1 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/src/mesa/main/compiler.h b/src/mesa/main/compiler.h
> index 921e302..96e24e4 100644
> --- a/src/mesa/main/compiler.h
> +++ b/src/mesa/main/compiler.h
> @@ -310,6 +310,17 @@ static INLINE GLuint CPU_TO_LE32(GLuint x)
>   #endif
>   #endif
>
> +
> +/**
> + * Static (compile-time) assertion.
> + * Basically, use COND to dimension an array.  If COND is false/zero the
> + * array size will be -1 and we'll get a compilation error.
> + */
> +#define JOIN(x, y) x##y
> +#define STATIC_ASSERT_LINE(COND, LINE) do { typedef int JOIN(static_assertion_failed_at_line_,LINE)[(!!(COND))*2-1]; } while (0)
> +#define STATIC_ASSERT(COND)  STATIC_ASSERT_LINE(COND, __LINE__)
> +
> +
>   #if (__GNUC__>= 3)
>   #define PRINTFLIKE(f, a) __attribute__ ((format(__printf__, f, a)))
>   #else