1  /* Copyright (C) 2005-2023 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  }