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| -rw-r--r-- | src/util/macros.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/util/macros.h b/src/util/macros.h index a9a52a1a478..aa36253217c 100644 --- a/src/util/macros.h +++ b/src/util/macros.h @@ -241,6 +241,23 @@ do { \ #define ATTRIBUTE_NOINLINE #endif + +/** + * Check that STRUCT::FIELD can hold MAXVAL. We use a lot of bitfields + * in Mesa/gallium. We have to be sure they're of sufficient size to + * hold the largest expected value. + * Note that with MSVC, enums are signed and enum bitfields need one extra + * high bit (always zero) to ensure the max value is handled correctly. + * This macro will detect that with MSVC, but not GCC. + */ +#define ASSERT_BITFIELD_SIZE(STRUCT, FIELD, MAXVAL) \ + do { \ + MAYBE_UNUSED STRUCT s; \ + s.FIELD = (MAXVAL); \ + assert((int) s.FIELD == (MAXVAL) && "Insufficient bitfield size!"); \ + } while (0) + + /** Compute ceiling of integer quotient of A divided by B. */ #define DIV_ROUND_UP( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 ) |