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util: add new ASSERT_BITFIELD_SIZE() macro (v3)

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For checking that bitfields are large enough to hold the largest
expected value.

v2: move into existing util/macros.h header where STATIC_ASSERT() lives.
v3: add MAYBE_UNUSED to variable declaration

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Brian Paul 2017-11-15 16:17:44 -07:00
parent c8ce3c2689
commit fe81e1f975
1 changed files with 17 additions and 0 deletions
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17
src/util/macros.h
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@ -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 )