File: alloca.h

package info (click to toggle)
glibc 2.24-11+deb9u4
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 225,852 kB
  • sloc: ansic: 996,505; asm: 261,827; sh: 10,484; makefile: 9,856; cpp: 4,169; python: 3,971; perl: 2,254; awk: 1,753; pascal: 1,521; yacc: 291; sed: 80
file content (76 lines) | stat: -rw-r--r-- 2,334 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
#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