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8b6dba81 | 1 | /* Memory management routines. |
85ec4feb | 2 | Copyright (C) 2002-2018 Free Software Foundation, Inc. |
6de9cd9a DN |
3 | Contributed by Paul Brook <paul@nowt.org> |
4 | ||
bb408e87 | 5 | This file is part of the GNU Fortran runtime library (libgfortran). |
6de9cd9a | 6 | |
57dea9f6 TM |
7 | Libgfortran is free software; you can redistribute it and/or |
8 | modify it under the terms of the GNU General Public | |
6de9cd9a | 9 | License as published by the Free Software Foundation; either |
748086b7 | 10 | version 3 of the License, or (at your option) any later version. |
57dea9f6 TM |
11 | |
12 | Libgfortran is distributed in the hope that it will be useful, | |
6de9cd9a DN |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
57dea9f6 | 15 | GNU General Public License for more details. |
6de9cd9a | 16 | |
748086b7 JJ |
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/>. */ | |
6de9cd9a | 25 | |
6de9cd9a | 26 | #include "libgfortran.h" |
92e6f3a4 JB |
27 | #include <errno.h> |
28 | ||
29 | #ifndef SIZE_MAX | |
30 | #define SIZE_MAX ((size_t)-1) | |
31 | #endif | |
6de9cd9a | 32 | |
6de9cd9a | 33 | |
6de9cd9a | 34 | void * |
1a0fd3d3 | 35 | xmalloc (size_t n) |
6de9cd9a DN |
36 | { |
37 | void *p; | |
38 | ||
1a0fd3d3 JB |
39 | if (n == 0) |
40 | n = 1; | |
41 | ||
42 | p = malloc (n); | |
43 | ||
6de9cd9a DN |
44 | if (p == NULL) |
45 | os_error ("Memory allocation failed"); | |
46 | ||
47 | return p; | |
48 | } | |
49 | ||
50 | ||
92e6f3a4 JB |
51 | void * |
52 | xmallocarray (size_t nmemb, size_t size) | |
53 | { | |
54 | void *p; | |
55 | ||
56 | if (!nmemb || !size) | |
57 | size = nmemb = 1; | |
62c986af JJ |
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) | |
92e6f3a4 JB |
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 | ||
f4471acb JB |
75 | /* calloc wrapper that aborts on error. */ |
76 | ||
77 | void * | |
78 | xcalloc (size_t nmemb, size_t size) | |
79 | { | |
92e6f3a4 | 80 | if (!nmemb || !size) |
f4471acb JB |
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 | } | |
d74fd3c7 JB |
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 | } |