libgfortran/runtime/memory.c

   1 /* Memory management routines.
   2    Copyright (C) 2002-2017 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4
   5 This file is part of the GNU Fortran runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 3 of the License, or (at your option) any later version.
  11
  12 Libgfortran is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for 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 #include "libgfortran.h"
  27 #include <errno.h>
  28
  29 #ifndef SIZE_MAX
  30 #define SIZE_MAX ((size_t)-1)
  31 #endif
  32
  33
  34 void *
  35 xmalloc (size_t n)
  36 {
  37   void *p;
  38
  39   if (n == 0)
  40     n = 1;
  41
  42   p = malloc (n);
  43
  44   if (p == NULL)
  45     os_error ("Memory allocation failed");
  46
  47   return p;
  48 }
  49
  50
  51 void *
  52 xmallocarray (size_t nmemb, size_t size)
  53 {
  54   void *p;
  55
  56   if (!nmemb || !size)
  57     size = nmemb = 1;
  58 #define HALF_SIZE_T (((size_t) 1) << (__CHAR_BIT__ * sizeof (size_t) / 2))
  59   else if (__builtin_expect ((nmemb | size) >= HALF_SIZE_T, 0)
  60            && nmemb > SIZE_MAX / size)
  61     {
  62       errno = ENOMEM;
  63       os_error ("Integer overflow in xmallocarray");
  64     }
  65
  66   p = malloc (nmemb * size);
  67
  68   if (!p)
  69     os_error ("Memory allocation failed in xmallocarray");
  70
  71   return p;
  72 }
  73
  74
  75 /* calloc wrapper that aborts on error.  */
  76
  77 void *
  78 xcalloc (size_t nmemb, size_t size)
  79 {
  80   if (!nmemb || !size)
  81     nmemb = size = 1;
  82
  83   void *p = calloc (nmemb, size);
  84   if (!p)
  85     os_error ("Allocating cleared memory failed");
  86
  87   return p;
  88 }
  89
  90
  91 void *
  92 xrealloc (void *ptr, size_t size)
  93 {
  94   if (size == 0)
  95     size = 1;
  96
  97   void *newp = realloc (ptr, size);
  98   if (!newp)
  99     os_error ("Memory allocation failure in xrealloc");
 100
 101   return newp;
 102 }