diff options
Diffstat (limited to 'gl/tests/malloca.h')
| -rw-r--r-- | gl/tests/malloca.h | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/gl/tests/malloca.h b/gl/tests/malloca.h deleted file mode 100644 index 6fbe45eab6..0000000000 --- a/gl/tests/malloca.h +++ /dev/null @@ -1,133 +0,0 @@ -/* Safe automatic memory allocation. - Copyright (C) 2003-2007, 2009-2013 Free Software Foundation, Inc. - Written by Bruno Haible <bruno@clisp.org>, 2003. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3, or (at your option) - any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, see <http://www.gnu.org/licenses/>. */ - -#ifndef _MALLOCA_H -#define _MALLOCA_H - -#include <alloca.h> -#include <stddef.h> -#include <stdlib.h> - - -#ifdef __cplusplus -extern "C" { -#endif - - -/* safe_alloca(N) is equivalent to alloca(N) when it is safe to call - alloca(N); otherwise it returns NULL. It either returns N bytes of - memory allocated on the stack, that lasts until the function returns, - or NULL. - Use of safe_alloca should be avoided: - - inside arguments of function calls - undefined behaviour, - - in inline functions - the allocation may actually last until the - calling function returns. -*/ -#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. - This must be a macro, not a function. */ -# define safe_alloca(N) ((N) < 4032 ? alloca (N) : NULL) -#else -# define safe_alloca(N) ((void) (N), NULL) -#endif - -/* malloca(N) is a safe variant of alloca(N). It allocates N bytes of - memory allocated on the stack, that must be freed using freea() before - the function returns. Upon failure, it returns NULL. */ -#if HAVE_ALLOCA -# define malloca(N) \ - ((N) < 4032 - sa_increment \ - ? (void *) ((char *) alloca ((N) + sa_increment) + sa_increment) \ - : mmalloca (N)) -#else -# define malloca(N) \ - mmalloca (N) -#endif -extern void * mmalloca (size_t n); - -/* Free a block of memory allocated through malloca(). */ -#if HAVE_ALLOCA -extern void freea (void *p); -#else -# define freea free -#endif - -/* nmalloca(N,S) is an overflow-safe variant of malloca (N * S). - It allocates an array of N objects, each with S bytes of memory, - on the stack. S must be positive and N must be nonnegative. - The array must be freed using freea() before the function returns. */ -#if 1 -/* Cf. the definition of xalloc_oversized. */ -# define nmalloca(n, s) \ - ((n) > (size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) \ - ? NULL \ - : malloca ((n) * (s))) -#else -extern void * nmalloca (size_t n, size_t s); -#endif - - -#ifdef __cplusplus -} -#endif - - -/* ------------------- Auxiliary, non-public definitions ------------------- */ - -/* Determine the alignment of a type at compile time. */ -#if defined __GNUC__ || defined __IBM__ALIGNOF__ -# define sa_alignof __alignof__ -#elif defined __cplusplus - template <class type> struct sa_alignof_helper { char __slot1; type __slot2; }; -# define sa_alignof(type) offsetof (sa_alignof_helper<type>, __slot2) -#elif defined __hpux - /* Work around a HP-UX 10.20 cc bug with enums constants defined as offsetof - values. */ -# define sa_alignof(type) (sizeof (type) <= 4 ? 4 : 8) -#elif defined _AIX - /* Work around an AIX 3.2.5 xlc bug with enums constants defined as offsetof - values. */ -# define sa_alignof(type) (sizeof (type) <= 4 ? 4 : 8) -#else -# define sa_alignof(type) offsetof (struct { char __slot1; type __slot2; }, __slot2) -#endif - -enum -{ -/* The desired alignment of memory allocations is the maximum alignment - among all elementary types. */ - sa_alignment_long = sa_alignof (long), - sa_alignment_double = sa_alignof (double), -#if HAVE_LONG_LONG_INT - sa_alignment_longlong = sa_alignof (long long), -#endif - sa_alignment_longdouble = sa_alignof (long double), - sa_alignment_max = ((sa_alignment_long - 1) | (sa_alignment_double - 1) -#if HAVE_LONG_LONG_INT - | (sa_alignment_longlong - 1) -#endif - | (sa_alignment_longdouble - 1) - ) + 1, -/* The increment that guarantees room for a magic word must be >= sizeof (int) - and a multiple of sa_alignment_max. */ - sa_increment = ((sizeof (int) + sa_alignment_max - 1) / sa_alignment_max) * sa_alignment_max -}; - -#endif /* _MALLOCA_H */ |