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Make use of GCC alloc_align attribute

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This lets the compiler know about the alignment of pointers returned
by aligned_alloc(3), posix_memalign(3). and contigmalloc(9)

Currently this is only supported in recent gcc but we are ready to
use it if clang implements it.

Relnotes:	yes
This commit is contained in:
Pedro F. Giffuni 2015-05-15 20:43:37 +00:00
parent 77ac67e29d
commit ee90489bc4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=282988
2 changed files with 4 additions and 3 deletions
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5
include/stdlib.h
View File

@ -156,7 +156,8 @@ _Noreturn void _Exit(int);
* If we're in a mode greater than C99, expose C11 functions.
*/
#if __ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L
void * aligned_alloc(size_t, size_t) __malloc_like __alloc_size(2);
void * aligned_alloc(size_t, size_t) __malloc_like __alloc_align(1)
__alloc_size(2);
int at_quick_exit(void (*)(void));
_Noreturn void
quick_exit(int);
@ -171,7 +172,7 @@ char *realpath(const char * __restrict, char * __restrict);
int rand_r(unsigned *); /* (TSF) */
#endif
#if __POSIX_VISIBLE >= 200112
int posix_memalign(void **, size_t, size_t) __nonnull(1)
int posix_memalign(void **, size_t, size_t) __nonnull(1) __alloc_align(2)
__alloc_size(3); /* (ADV) */
int setenv(const char *, const char *, int);
int unsetenv(const char *);

2
sys/sys/malloc.h
View File

@ -174,7 +174,7 @@ void contigfree(void *addr, unsigned long size, struct malloc_type *type);
void *contigmalloc(unsigned long size, struct malloc_type *type, int flags,
vm_paddr_t low, vm_paddr_t high, unsigned long alignment,
vm_paddr_t boundary) __malloc_like __result_use_check
__alloc_size(1);
__alloc_size(1) __alloc_align(6);
void free(void *addr, struct malloc_type *type);
void *malloc(unsigned long size, struct malloc_type *type, int flags)
__malloc_like __result_use_check __alloc_size(1);