| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 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 |