1 | #ifndef _ALLOCA_H |
2 | |
3 | #include <stdlib/alloca.h> |
4 | |
5 | # ifndef _ISOMAC |
6 | |
7 | #include <stackinfo.h> |
8 | |
9 | #undef __alloca |
10 | |
11 | /* Now define the internal interfaces. */ |
12 | extern void *__alloca (size_t __size); |
13 | |
14 | #ifdef __GNUC__ |
15 | # define __alloca(size) __builtin_alloca (size) |
16 | #endif /* GCC. */ |
17 | |
18 | extern int __libc_use_alloca (size_t size) __attribute__ ((const)); |
19 | extern int __libc_alloca_cutoff (size_t size) __attribute__ ((const)); |
20 | libc_hidden_proto (__libc_alloca_cutoff) |
21 | |
22 | #define __MAX_ALLOCA_CUTOFF 65536 |
23 | |
24 | #include <allocalim.h> |
25 | |
26 | #ifndef stackinfo_alloca_round |
27 | # define stackinfo_alloca_round(l) (((l) + 15) & -16) |
28 | #endif |
29 | |
30 | #if _STACK_GROWS_DOWN |
31 | # define extend_alloca(buf, len, newlen) \ |
32 | (__typeof (buf)) ({ size_t __newlen = stackinfo_alloca_round (newlen); \ |
33 | char *__newbuf = __alloca (__newlen); \ |
34 | if (__newbuf + __newlen == (char *) (buf)) \ |
35 | len += __newlen; \ |
36 | else \ |
37 | len = __newlen; \ |
38 | __newbuf; }) |
39 | #elif _STACK_GROWS_UP |
40 | # define extend_alloca(buf, len, newlen) \ |
41 | (__typeof (buf)) ({ size_t __newlen = stackinfo_alloca_round (newlen); \ |
42 | char *__newbuf = __alloca (__newlen); \ |
43 | char *__buf = (char *) (buf); \ |
44 | if (__buf + len == __newbuf) \ |
45 | { \ |
46 | len += __newlen; \ |
47 | __newbuf = __buf; \ |
48 | } \ |
49 | else \ |
50 | len = __newlen; \ |
51 | __newbuf; }) |
52 | #else |
53 | # define extend_alloca(buf, len, newlen) \ |
54 | __alloca (((len) = (newlen))) |
55 | #endif |
56 | |
57 | #if defined stackinfo_get_sp && defined stackinfo_sub_sp |
58 | # define alloca_account(size, avar) \ |
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__); \ |
67 | m__; }) |
68 | #else |
69 | # define alloca_account(size, avar) \ |
70 | ({ size_t s__ = (size); \ |
71 | avar += s__; \ |
72 | __alloca (s__); }) |
73 | # define extend_alloca_account(buf, len, newlen, avar) \ |
74 | ({ size_t s__ = (newlen); \ |
75 | avar += s__; \ |
76 | extend_alloca (buf, len, s__); }) |
77 | #endif |
78 | |
79 | # endif /* !_ISOMAC */ |
80 | #endif |
81 | |