libgomp/alloc.c

   1 /* Copyright (C) 2005-2024 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU Offloading and Multi Processing Library
   5    (libgomp).
   6
   7    Libgomp is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  14    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15    more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 /* This file contains wrappers for the system allocation routines.  Most
  27    places in the OpenMP API do not make any provision for failure, so in
  28    general we cannot allow memory allocation to fail.  */
  29
  30 #define _GNU_SOURCE
  31 #include "libgomp.h"
  32 #include <stdlib.h>
  33
  34
  35 void *
  36 gomp_malloc (size_t size)
  37 {
  38   void *ret = malloc (size);
  39   if (ret == NULL)
  40     gomp_fatal ("Out of memory allocating %lu bytes", (unsigned long) size);
  41   return ret;
  42 }
  43
  44 void *
  45 gomp_malloc_cleared (size_t size)
  46 {
  47   void *ret = calloc (1, size);
  48   if (ret == NULL)
  49     gomp_fatal ("Out of memory allocating %lu bytes", (unsigned long) size);
  50   return ret;
  51 }
  52
  53 void *
  54 gomp_realloc (void *old, size_t size)
  55 {
  56   void *ret = realloc (old, size);
  57   if (ret == NULL)
  58     gomp_fatal ("Out of memory allocating %lu bytes", (unsigned long) size);
  59   return ret;
  60 }
  61
  62 void *
  63 gomp_aligned_alloc (size_t al, size_t size)
  64 {
  65   void *ret;
  66   if (al < sizeof (void *))
  67     al = sizeof (void *);
  68 #ifdef HAVE_MEMALIGN
  69   {
  70     extern void *memalign (size_t, size_t);
  71     ret = memalign (al, size);
  72   }
  73 #elif defined(HAVE_POSIX_MEMALIGN)
  74   if (posix_memalign (&ret, al, size) != 0)
  75     ret = NULL;
  76 #elif defined(HAVE_ALIGNED_ALLOC)
  77   {
  78     size_t sz = (size + al - 1) & ~(al - 1);
  79     if (__builtin_expect (sz >= size, 1))
  80       ret = aligned_alloc (al, sz);
  81     else
  82       ret = NULL;
  83   }
  84 #elif defined(HAVE__ALIGNED_MALLOC)
  85   ret = _aligned_malloc (size, al);
  86 #else
  87   ret = NULL;
  88   if ((al & (al - 1)) == 0 && size)
  89     {
  90       void *p = malloc (size + al);
  91       if (p)
  92         {
  93           void *ap = (void *) (((uintptr_t) p + al) & -al);
  94           ((void **) ap)[-1] = p;
  95           ret = ap;
  96         }
  97     }
  98 #endif
  99   if (ret == NULL)
 100     gomp_fatal ("Out of memory allocating %lu bytes", (unsigned long) size);
 101   return ret;
 102 }
 103
 104 void
 105 gomp_aligned_free (void *ptr)
 106 {
 107 #ifdef GOMP_HAVE_EFFICIENT_ALIGNED_ALLOC
 108   free (ptr);
 109 #elif defined(HAVE__ALIGNED_MALLOC)
 110   _aligned_free (ptr);
 111 #else
 112   if (ptr)
 113     free (((void **) ptr)[-1]);
 114 #endif
 115 }