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mirror of https://git.savannah.gnu.org/git/emacs.git synced 2024-12-04 08:47:11 +00:00
emacs/lib/malloca.h
Paul Eggert 64d1b9fd8a Update from gnulib
This incorporates:
2019-12-23 mktime, nstrftime: tweak division performance
2019-12-22 count-leading-zeros: assume 'long long'
2019-12-22 count-one-bits: assume 'long long'
2019-12-22 count-trailing-zeros: assume 'long long'
2019-12-12 inttypes-incomplete: assume 'long long'
2019-12-22 malloca: assume 'long long'
2019-12-22 stdint: assume 'long long'
2019-12-22 strtoll, strtoimax, strtoumax: assume 'long long'
2019-12-22 prefer lib_SOURCES to unconditional AC_LIBOBJ
2019-12-19 nstrftime: avoid a shadowing warning
2019-12-18 improve port of AC_C_RESTRICT to Oracle C++
2019-12-12 stdalign: port to xlclang 16.01
2019-12-11 stddef, unistd: fix compilation error in C++ mode on MSVC
2019-12-08 fix compilation errors in C++ mode on Haiku
2019-12-08 fix compilation errors in 32-bit C++ mode on HP-UX 11/ia64
2019-12-08 fix compilation error in C++ mode on OpenBSD
* build-aux/config.guess, doc/misc/texinfo.tex:
* lib/count-leading-zeros.h, lib/count-one-bits.h:
* lib/count-trailing-zeros.h, lib/inttypes.in.h, lib/malloca.h:
* lib/mktime.c, lib/nstrftime.c, lib/signal.in.h, lib/stdalign.in.h:
* lib/stddef.in.h, lib/stdint.in.h, lib/stdio.in.h, lib/stdlib.in.h:
* lib/strtoimax.c, lib/unistd.in.h, m4/gnulib-common.m4:
* m4/inttypes.m4, m4/largefile.m4, m4/malloca.m4, m4/strtoimax.m4:
* m4/strtoll.m4:
Copy from Gnulib.  Also, change copyright notices in some other
Gnulib-copied files to exactly match Gnulib, as Gnulib updated
them in a trivially different way.
* lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.
2019-12-31 19:11:56 -08:00

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/* Safe automatic memory allocation.
Copyright (C) 2003-2007, 2009-2020 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 <https://www.gnu.org/licenses/>. */
#ifndef _MALLOCA_H
#define _MALLOCA_H
#include <alloca.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdint.h>
#include "xalloc-oversized.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 - (2 * sa_alignment_max - 1) \
? (void *) (((uintptr_t) (char *) alloca ((N) + 2 * sa_alignment_max - 1) \
+ (2 * sa_alignment_max - 1)) \
& ~(uintptr_t)(2 * sa_alignment_max - 1)) \
: 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. */
#define nmalloca(n, s) (xalloc_oversized (n, s) ? NULL : malloca ((n) * (s)))
#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),
sa_alignment_longlong = sa_alignof (long long),
sa_alignment_longdouble = sa_alignof (long double),
sa_alignment_max = ((sa_alignment_long - 1) | (sa_alignment_double - 1)
| (sa_alignment_longlong - 1)
| (sa_alignment_longdouble - 1)
) + 1
};
#endif /* _MALLOCA_H */