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| author |   Andrew Opalach <andrew@akon.city>
| 2025-09-26 13:02:00 -0400 |
|---|---|---|
| committer | Andrew Opalach <andrew@akon.city>
| 2025-09-26 13:02:00 -0400 |
| commit | 00c292b5bd4f6cf24287c7581d54a60f4b6fdcb7 (patch) | |
| tree | 09f4a12f5544afc9a45af883c2f8240b01977d84 /include | |
| parent | 023af72f141005860219b3c63c3a63d2c179b2c1 (diff) | |
| download | libalabaster-00c292b5bd4f6cf24287c7581d54a60f4b6fdcb7.tar.gz libalabaster-00c292b5bd4f6cf24287c7581d54a60f4b6fdcb7.tar.bz2 libalabaster-00c292b5bd4f6cf24287c7581d54a60f4b6fdcb7.zip | |
macros: Define unreachable()
Signed-off-by: Andrew Opalach <andrew@akon.city>
Diffstat (limited to 'include')
| -rw-r--r-- | include/al/macros.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/al/macros.h b/include/al/macros.h index 0f116dc..fbf3f7e 100644 --- a/include/al/macros.h +++ b/include/al/macros.h @@ -20,6 +20,19 @@ #define UNLIKELY(x) x #endif +// Keep in mind the idea of an unreachable path is not the same +// as "We should never be here". Unreachable is a compiler hint that means +// "It's logically impossible to be here". +// https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005funreachable +// https://github.com/yehuthi/c_unreachable/blob/1f672a573b2d45cf1479fbb771c17c9ee35bff6b/include/c_unreachable.h#L21C1-L43C7 +#ifndef unreachable +#if defined(__GNUC__) +#define unreachable() (__builtin_unreachable()) +#elif defined(_MSC_VER) +#define unreachable() (__assume(0)) +#endif +#endif + #if defined MIN || defined MAX || defined CLAMP || defined SWAP || defined ARRAY_SIZE || defined STR || defined XSTR || defined BOOLSTR #error "Conflicting definitions for common macros" #endif |