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6796bc80 UD |
1 | #ifndef _ALLOCA_H |
2 | ||
28f540f4 | 3 | #include <stdlib/alloca.h> |
47755784 ZW |
4 | |
5 | # ifndef _ISOMAC | |
6 | ||
832737d5 | 7 | #include <stackinfo.h> |
bdbf022d UD |
8 | |
9 | #undef __alloca | |
10 | ||
11 | /* Now define the internal interfaces. */ | |
c19559b0 | 12 | extern void *__alloca (size_t __size); |
bdbf022d UD |
13 | |
14 | #ifdef __GNUC__ | |
15 | # define __alloca(size) __builtin_alloca (size) | |
16 | #endif /* GCC. */ | |
6796bc80 | 17 | |
6166815d UD |
18 | extern int __libc_use_alloca (size_t size) __attribute__ ((const)); |
19 | extern int __libc_alloca_cutoff (size_t size) __attribute__ ((const)); | |
a85b5cb4 | 20 | libc_hidden_proto (__libc_alloca_cutoff) |
6166815d UD |
21 | |
22 | #define __MAX_ALLOCA_CUTOFF 65536 | |
23 | ||
24 | #include <allocalim.h> | |
25 | ||
647776f6 AS |
26 | #ifndef stackinfo_alloca_round |
27 | # define stackinfo_alloca_round(l) (((l) + 15) & -16) | |
28 | #endif | |
29 | ||
832737d5 UD |
30 | #if _STACK_GROWS_DOWN |
31 | # define extend_alloca(buf, len, newlen) \ | |
647776f6 | 32 | (__typeof (buf)) ({ size_t __newlen = stackinfo_alloca_round (newlen); \ |
832737d5 | 33 | char *__newbuf = __alloca (__newlen); \ |
ba7d2c54 | 34 | if (__newbuf + __newlen == (char *) (buf)) \ |
832737d5 UD |
35 | len += __newlen; \ |
36 | else \ | |
37 | len = __newlen; \ | |
38 | __newbuf; }) | |
39 | #elif _STACK_GROWS_UP | |
40 | # define extend_alloca(buf, len, newlen) \ | |
647776f6 | 41 | (__typeof (buf)) ({ size_t __newlen = stackinfo_alloca_round (newlen); \ |
832737d5 | 42 | char *__newbuf = __alloca (__newlen); \ |
ba7d2c54 | 43 | char *__buf = (char *) (buf); \ |
647776f6 | 44 | if (__buf + len == __newbuf) \ |
832737d5 UD |
45 | { \ |
46 | len += __newlen; \ | |
47 | __newbuf = __buf; \ | |
48 | } \ | |
49 | else \ | |
50 | len = __newlen; \ | |
51 | __newbuf; }) | |
52 | #else | |
1aafee87 | 53 | # define extend_alloca(buf, len, newlen) \ |
832737d5 UD |
54 | __alloca (((len) = (newlen))) |
55 | #endif | |
56 | ||
fd537e53 UD |
57 | #if defined stackinfo_get_sp && defined stackinfo_sub_sp |
58 | # define alloca_account(size, avar) \ | |
34a9094f UD |
59 | ({ void *old__ = stackinfo_get_sp (); \ |
60 | void *m__ = __alloca (size); \ | |
61 | avar += stackinfo_sub_sp (old__); \ | |
62 | m__; }) | |
63 | # define extend_alloca_account(buf, len, newlen, avar) \ | |
64 | ({ void *old__ = stackinfo_get_sp (); \ | |
65 | void *m__ = extend_alloca (buf, len, newlen); \ | |
66 | avar += stackinfo_sub_sp (old__); \ | |
fd537e53 UD |
67 | m__; }) |
68 | #else | |
69 | # define alloca_account(size, avar) \ | |
34a9094f UD |
70 | ({ size_t s__ = (size); \ |
71 | avar += s__; \ | |
647925b2 | 72 | __alloca (s__); }) |
34a9094f UD |
73 | # define extend_alloca_account(buf, len, newlen, avar) \ |
74 | ({ size_t s__ = (newlen); \ | |
75 | avar += s__; \ | |
76 | extend_alloca (buf, len, s__); }) | |
fd537e53 UD |
77 | #endif |
78 | ||
47755784 | 79 | # endif /* !_ISOMAC */ |
6796bc80 | 80 | #endif |