[v2,5/5] regex: stop using alloca
Commit Message
It syncs with gnulib version 87ed1f9c4. No functional changes is
expected.
Checked on x86_64-linux-gnu.
---
posix/regex_internal.h | 19 -------------------
1 file changed, 19 deletions(-)
Comments
I will commit this shortly if no one opposes it.
On 13/01/2021 13:58, Adhemerval Zanella wrote:
> It syncs with gnulib version 87ed1f9c4. No functional changes is
> expected.
>
> Checked on x86_64-linux-gnu.
> ---
> posix/regex_internal.h | 19 -------------------
> 1 file changed, 19 deletions(-)
>
> diff --git a/posix/regex_internal.h b/posix/regex_internal.h
> index e31ac92674..641b27e2b1 100644
> --- a/posix/regex_internal.h
> +++ b/posix/regex_internal.h
> @@ -444,25 +444,6 @@ typedef struct re_dfa_t re_dfa_t;
> #define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx))
> #define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx))
>
> -#if defined _LIBC || HAVE_ALLOCA
> -# include <alloca.h>
> -#endif
> -
> -#ifndef _LIBC
> -# if HAVE_ALLOCA
> -/* The OS usually guarantees only one guard page at the bottom of the stack,
> - and a page size can be as small as 4096 bytes. So we cannot safely
> - allocate anything larger than 4096 bytes. Also care for the possibility
> - of a few compiler-allocated temporary stack slots. */
> -# define __libc_use_alloca(n) ((n) < 4032)
> -# else
> -/* alloca is implemented with malloc, so just use malloc. */
> -# define __libc_use_alloca(n) 0
> -# undef alloca
> -# define alloca(n) malloc (n)
> -# endif
> -#endif
> -
> #ifdef _LIBC
> # define MALLOC_0_IS_NONNULL 1
> #elif !defined MALLOC_0_IS_NONNULL
>
@@ -444,25 +444,6 @@ typedef struct re_dfa_t re_dfa_t;
#define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx))
#define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx))
-#if defined _LIBC || HAVE_ALLOCA
-# include <alloca.h>
-#endif
-
-#ifndef _LIBC
-# if HAVE_ALLOCA
-/* The OS usually guarantees only one guard page at the bottom of the stack,
- and a page size can be as small as 4096 bytes. So we cannot safely
- allocate anything larger than 4096 bytes. Also care for the possibility
- of a few compiler-allocated temporary stack slots. */
-# define __libc_use_alloca(n) ((n) < 4032)
-# else
-/* alloca is implemented with malloc, so just use malloc. */
-# define __libc_use_alloca(n) 0
-# undef alloca
-# define alloca(n) malloc (n)
-# endif
-#endif
-
#ifdef _LIBC
# define MALLOC_0_IS_NONNULL 1
#elif !defined MALLOC_0_IS_NONNULL