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std-aux: add _NM_PTR_IS_ALIGNED() helper macro

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Thomas Haller 2022-12-14 15:40:36 +01:00
parent 9a67988f07
commit 2b89b2dc01
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GPG key ID: 29C2366E4DFC5728
1 changed files with 19 additions and 7 deletions
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26
src/libnm-std-aux/nm-std-aux.h
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@ -1490,6 +1490,18 @@ nm_utils_addr_family_from_size(size_t len)
return NM_AF_UNSPEC;
}
#define _NM_PTR_IS_ALIGNED_(uniq, type, ptr) \
({ \
const void *const NM_UNIQ_T(_ptr, uniq) = (ptr); \
\
/* NULL is accepted too. */ \
\
(!NM_UNIQ_T(_ptr, uniq) \
|| ((((uintptr_t) (void *) NM_UNIQ_T(_ptr, uniq)) % _nm_alignof(type)) == 0)); \
})
#define _NM_PTR_IS_ALIGNED(type, ptr) _NM_PTR_IS_ALIGNED_(NM_UNIQ, type, (ptr))
/* We build with "-Wcast-align=strict", which can warn about alignment problems
* with casting. In some cases, we know that the pointer has the suitable
* alignment and the cast is in fact correct. The way to disable the warning
@ -1497,13 +1509,13 @@ nm_utils_addr_family_from_size(size_t len)
*
* This macro does essentially that, but it also does an nm_assert() that the
* alignment of the pointer is suitable to cast to (Type *). */
#define _NM_CAST_ALIGN(uniq, Type, ptr) \
({ \
const void *const NM_UNIQ_T(_ptr, uniq) = (ptr); \
\
nm_assert((((uintptr_t) NM_UNIQ_T(_ptr, uniq)) % _nm_alignof(Type)) == 0u); \
\
((Type *) NM_UNIQ_T(_ptr, uniq)); \
#define _NM_CAST_ALIGN(uniq, Type, ptr) \
({ \
const void *const NM_UNIQ_T(_ptr, uniq) = (ptr); \
\
nm_assert(_NM_PTR_IS_ALIGNED(Type, NM_UNIQ_T(_ptr, uniq))); \
\
((Type *) NM_UNIQ_T(_ptr, uniq)); \
})
#define NM_CAST_ALIGN(Type, ptr) _NM_CAST_ALIGN(NM_UNIQ, Type, ptr)