Mercurial > gnulib
view lib/xmalloca.h @ 39235:6a04b04905e5
malloca, xmalloca: Make multithread-safe.
Reported by Florian Weimer <fweimer@redhat.com>.
Implements an idea by Ondřej Bílka <neleai@seznam.cz>.
* lib/malloca.h (malloca): In the stack allocation case, return a
pointer that is a multiple of 2 * sa_alignment_max.
(sa_increment): Remove enum item.
* lib/xmalloca.h (xmalloca): In the stack allocation case, return
a pointer that is a multiple of 2 * sa_alignment_max.
* lib/malloca.c (NO_SANITIZE_MEMORY): Remove macro.
(MAGIC_NUMBER, MAGIC_SIZE, preliminary_header, HEADER_SIZE, header,
HASH_TABLE_SIZE, mmalloca_results): Remove.
(small_t): New type.
(mmalloca, free): Rewritten.
* lib/malloca.valgrind: Remove file.
* modules/malloca (Files): Remove it.
(Depends-on): Remove verify.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Fri, 02 Feb 2018 19:32:02 +0100 |
parents | 24e347e0e326 |
children | 149ea3012b47 |
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/* Safe automatic memory allocation with out of memory checking. Copyright (C) 2003, 2005, 2007, 2009-2018 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 of the License, 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 _XMALLOCA_H #define _XMALLOCA_H #include "malloca.h" #include "xalloc.h" #ifdef __cplusplus extern "C" { #endif /* xmalloca(N) is a checking 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 exits with an error message. */ #if HAVE_ALLOCA # define xmalloca(N) \ ((N) < 4032 - (2 * sa_alignment_max - 1) \ ? (void *) (((uintptr_t) alloca ((N) + 2 * sa_alignment_max - 1) \ + (2 * sa_alignment_max - 1)) \ & ~(uintptr_t)(2 * sa_alignment_max - 1)) \ : xmmalloca (N)) extern void * xmmalloca (size_t n); #else # define xmalloca(N) \ xmalloc (N) #endif /* xnmalloca(N,S) is an overflow-safe variant of xmalloca (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. Upon failure, it exits with an error message. */ #if HAVE_ALLOCA /* Rely on xmalloca (SIZE_MAX) calling xalloc_die (). */ # define xnmalloca(n, s) \ xmalloca (xalloc_oversized ((n), (s)) ? (size_t) (-1) : (n) * (s)) #else # define xnmalloca(n, s) \ xnmalloc ((n), (s)) #endif #ifdef __cplusplus } #endif #endif /* _XMALLOCA_H */