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