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Code Releases Activity

Macro SKIP_BACK now evaluates its argument only once.

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This commit is contained in:
Maria Matejka 2023-11-24 12:11:21 +01:00
parent 48abd6a963
commit 194ed4e6e6
1 changed files with 5 additions and 1 deletions
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6
lib/birdlib.h
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@ -26,7 +26,11 @@
#define OFFSETOF(s, i) ((size_t) &((s *)0)->i) #define OFFSETOF(s, i) ((size_t) &((s *)0)->i)
#endif #endif
#define SKIP_BACK(s, i, p) ({ s *_ptr = ((s *)((char *)p - OFFSETOF(s, i))); SAME_TYPE(&_ptr->i, p); _ptr; }) #define SKIP_BACK(s, i, p) ({ \
typeof(p) _orig = p; \
s *_ptr = ((s *)((char *)_orig - OFFSETOF(s, i))); \
SAME_TYPE(&_ptr->i, _orig); \
_ptr; })
#define BIRD_ALIGN(s, a) (((s)+a-1)&~(a-1)) #define BIRD_ALIGN(s, a) (((s)+a-1)&~(a-1))
#define CPU_STRUCT_ALIGN (MAX_(_Alignof(void*), _Alignof(u64))) #define CPU_STRUCT_ALIGN (MAX_(_Alignof(void*), _Alignof(u64)))
#define BIRD_CPU_ALIGN(s) BIRD_ALIGN((s), CPU_STRUCT_ALIGN) #define BIRD_CPU_ALIGN(s) BIRD_ALIGN((s), CPU_STRUCT_ALIGN)