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command: Support evaluating C expressions in DECL_CONSTANT()

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-03-04 23:24:43 -05:00 • committed by KevinOConnor
parent b28e95ca1a
commit 7d73a35805
3 changed files with 41 additions and 15 deletions
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13
src/ctr.h
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@ -14,4 +14,17 @@
static char __PASTE(_DECLS_, __LINE__)[] __attribute__((used)) \
__section(".compile_time_request") = (REQUEST)
#define CTR_INT(V, S) ((((uint32_t)(V) >> S) & 0x3f) + 48)
// Declare a compile time request with an integer expression
#define DECL_CTR_INT(REQUEST, VALUE) \
static struct { char _r[sizeof(REQUEST)]; char _v[8]; } \
__PASTE(_DECLI_, __LINE__) __attribute__((used)) \
__section(".compile_time_request") = { \
REQUEST " ", { \
(VALUE) < 0 ? '-' : '+', \
CTR_INT((VALUE),0), CTR_INT((VALUE),6), \
CTR_INT((VALUE),12), CTR_INT((VALUE),18), \
CTR_INT((VALUE),24), CTR_INT((VALUE),30), 0 } }
#endif // ctr.h