mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 11:20:07 +00:00
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
#ifndef _ALLOCA_H
|
|
|
|
#include <stdlib/alloca.h>
|
|
#include <stackinfo.h>
|
|
|
|
#undef __alloca
|
|
|
|
/* Now define the internal interfaces. */
|
|
extern void *__alloca (size_t __size);
|
|
|
|
#ifdef __GNUC__
|
|
# define __alloca(size) __builtin_alloca (size)
|
|
#endif /* GCC. */
|
|
|
|
extern int __libc_use_alloca (size_t size) __attribute__ ((const));
|
|
extern int __libc_alloca_cutoff (size_t size) __attribute__ ((const));
|
|
|
|
#define __MAX_ALLOCA_CUTOFF 65536
|
|
|
|
#include <allocalim.h>
|
|
|
|
#if _STACK_GROWS_DOWN
|
|
# define extend_alloca(buf, len, newlen) \
|
|
(__typeof (buf)) ({ size_t __newlen = (newlen); \
|
|
char *__newbuf = __alloca (__newlen); \
|
|
if (__newbuf + __newlen == (char *) buf) \
|
|
len += __newlen; \
|
|
else \
|
|
len = __newlen; \
|
|
__newbuf; })
|
|
#elif _STACK_GROWS_UP
|
|
# define extend_alloca(buf, len, newlen) \
|
|
(__typeof (buf)) ({ size_t __newlen = (newlen); \
|
|
char *__newbuf = __alloca (__newlen); \
|
|
char *__buf = (buf); \
|
|
if (__buf + __newlen == __newbuf) \
|
|
{ \
|
|
len += __newlen; \
|
|
__newbuf = __buf; \
|
|
} \
|
|
else \
|
|
len = __newlen; \
|
|
__newbuf; })
|
|
#else
|
|
# define extend_alloca(buf, len, newlen) \
|
|
__alloca (((len) = (newlen)))
|
|
#endif
|
|
|
|
#endif
|