Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/include/alloca.h
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
76 lines (65 sloc)
2.28 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#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)); | |
libc_hidden_proto (__libc_alloca_cutoff) | |
#define __MAX_ALLOCA_CUTOFF 65536 | |
#include <allocalim.h> | |
#ifndef stackinfo_alloca_round | |
# define stackinfo_alloca_round(l) (((l) + 15) & -16) | |
#endif | |
#if _STACK_GROWS_DOWN | |
# define extend_alloca(buf, len, newlen) \ | |
(__typeof (buf)) ({ size_t __newlen = stackinfo_alloca_round (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 = stackinfo_alloca_round (newlen); \ | |
char *__newbuf = __alloca (__newlen); \ | |
char *__buf = (char *) (buf); \ | |
if (__buf + len == __newbuf) \ | |
{ \ | |
len += __newlen; \ | |
__newbuf = __buf; \ | |
} \ | |
else \ | |
len = __newlen; \ | |
__newbuf; }) | |
#else | |
# define extend_alloca(buf, len, newlen) \ | |
__alloca (((len) = (newlen))) | |
#endif | |
#if defined stackinfo_get_sp && defined stackinfo_sub_sp | |
# define alloca_account(size, avar) \ | |
({ void *old__ = stackinfo_get_sp (); \ | |
void *m__ = __alloca (size); \ | |
avar += stackinfo_sub_sp (old__); \ | |
m__; }) | |
# define extend_alloca_account(buf, len, newlen, avar) \ | |
({ void *old__ = stackinfo_get_sp (); \ | |
void *m__ = extend_alloca (buf, len, newlen); \ | |
avar += stackinfo_sub_sp (old__); \ | |
m__; }) | |
#else | |
# define alloca_account(size, avar) \ | |
({ size_t s__ = (size); \ | |
avar += s__; \ | |
__alloca (s__); }) | |
# define extend_alloca_account(buf, len, newlen, avar) \ | |
({ size_t s__ = (newlen); \ | |
avar += s__; \ | |
extend_alloca (buf, len, s__); }) | |
#endif | |
#endif |