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111
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1 /* Memory management routines.
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2 Copyright (C) 2002-2017 Free Software Foundation, Inc.
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3 Contributed by Paul Brook <paul@nowt.org>
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4
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5 This file is part of the GNU Fortran runtime library (libgfortran).
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6
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7 Libgfortran is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU General Public
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9 License as published by the Free Software Foundation; either
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10 version 3 of the License, or (at your option) any later version.
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11
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12 Libgfortran is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #include "libgfortran.h"
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27 #include <errno.h>
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28
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29 #ifndef SIZE_MAX
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30 #define SIZE_MAX ((size_t)-1)
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31 #endif
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32
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33
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34 void *
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35 xmalloc (size_t n)
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36 {
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37 void *p;
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38
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39 if (n == 0)
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40 n = 1;
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41
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42 p = malloc (n);
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43
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44 if (p == NULL)
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45 os_error ("Memory allocation failed");
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46
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47 return p;
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48 }
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49
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50
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51 void *
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52 xmallocarray (size_t nmemb, size_t size)
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53 {
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54 void *p;
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55
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56 if (!nmemb || !size)
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57 size = nmemb = 1;
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58 #define HALF_SIZE_T (((size_t) 1) << (__CHAR_BIT__ * sizeof (size_t) / 2))
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59 else if (__builtin_expect ((nmemb | size) >= HALF_SIZE_T, 0)
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60 && nmemb > SIZE_MAX / size)
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61 {
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62 errno = ENOMEM;
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63 os_error ("Integer overflow in xmallocarray");
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64 }
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65
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66 p = malloc (nmemb * size);
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67
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68 if (!p)
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69 os_error ("Memory allocation failed in xmallocarray");
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70
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71 return p;
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72 }
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73
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74
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75 /* calloc wrapper that aborts on error. */
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76
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77 void *
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78 xcalloc (size_t nmemb, size_t size)
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79 {
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80 if (!nmemb || !size)
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81 nmemb = size = 1;
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82
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83 void *p = calloc (nmemb, size);
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84 if (!p)
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85 os_error ("Allocating cleared memory failed");
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86
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87 return p;
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88 }
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89
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90
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91 void *
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92 xrealloc (void *ptr, size_t size)
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93 {
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94 if (size == 0)
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95 size = 1;
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96
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97 void *newp = realloc (ptr, size);
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98 if (!newp)
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99 os_error ("Memory allocation failure in xrealloc");
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100
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101 return newp;
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102 }
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