1 /* Memory allocation routines.
2
3 Copyright 1991, 1993, 1994, 2000, 2001, 2002 Free Software Foundation, Inc.
4
5 This file is part of the GNU MP Library.
6
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11
12 The GNU MP Library is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15 License for more details.
16
17 You should have received a copy of the GNU Lesser General Public License
18 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
19
20 #include <stdio.h>
21 #include <stdlib.h> /* for malloc, realloc, free */
22
23 #include "gmp.h"
24 #include "gmp-impl.h"
25
26
27 void * (*__gmp_allocate_func) __GMP_PROTO ((size_t)) = __gmp_default_allocate;
28 void * (*__gmp_reallocate_func) __GMP_PROTO ((void *, size_t, size_t))
29 = __gmp_default_reallocate;
30 void (*__gmp_free_func) __GMP_PROTO ((void *, size_t)) = __gmp_default_free;
31
32
33 /* Default allocation functions. In case of failure to allocate/reallocate
34 an error message is written to stderr and the program aborts. */
35
36 void *
__gmp_default_allocate(size_t size)37 __gmp_default_allocate (size_t size)
38 {
39 void *ret;
40 #ifdef DEBUG
41 size_t req_size = size;
42 size += 2 * BYTES_PER_MP_LIMB;
43 #endif
44 ret = malloc (size);
45 if (ret == 0)
46 {
47 fprintf (stderr, "GNU MP: Cannot allocate memory (size=%lu)\n", (long) size);
48 abort ();
49 }
50
51 #ifdef DEBUG
52 {
53 mp_ptr p = ret;
54 p++;
55 p[-1] = (0xdeadbeef << 31) + 0xdeafdeed;
56 if (req_size % BYTES_PER_MP_LIMB == 0)
57 p[req_size / BYTES_PER_MP_LIMB] = ~((0xdeadbeef << 31) + 0xdeafdeed);
58 ret = p;
59 }
60 #endif
61 return ret;
62 }
63
64 void *
__gmp_default_reallocate(void * oldptr,size_t old_size,size_t new_size)65 __gmp_default_reallocate (void *oldptr, size_t old_size, size_t new_size)
66 {
67 void *ret;
68
69 #ifdef DEBUG
70 size_t req_size = new_size;
71
72 if (old_size != 0)
73 {
74 mp_ptr p = oldptr;
75 if (p[-1] != (0xdeadbeef << 31) + 0xdeafdeed)
76 {
77 fprintf (stderr, "gmp: (realloc) data clobbered before allocation block\n");
78 abort ();
79 }
80 if (old_size % BYTES_PER_MP_LIMB == 0)
81 if (p[old_size / BYTES_PER_MP_LIMB] != ~((0xdeadbeef << 31) + 0xdeafdeed))
82 {
83 fprintf (stderr, "gmp: (realloc) data clobbered after allocation block\n");
84 abort ();
85 }
86 oldptr = p - 1;
87 }
88
89 new_size += 2 * BYTES_PER_MP_LIMB;
90 #endif
91
92 ret = realloc (oldptr, new_size);
93 if (ret == 0)
94 {
95 fprintf (stderr, "GNU MP: Cannot reallocate memory (old_size=%lu new_size=%lu)\n", (long) old_size, (long) new_size);
96 abort ();
97 }
98
99 #ifdef DEBUG
100 {
101 mp_ptr p = ret;
102 p++;
103 p[-1] = (0xdeadbeef << 31) + 0xdeafdeed;
104 if (req_size % BYTES_PER_MP_LIMB == 0)
105 p[req_size / BYTES_PER_MP_LIMB] = ~((0xdeadbeef << 31) + 0xdeafdeed);
106 ret = p;
107 }
108 #endif
109 return ret;
110 }
111
112 void
__gmp_default_free(void * blk_ptr,size_t blk_size)113 __gmp_default_free (void *blk_ptr, size_t blk_size)
114 {
115 #ifdef DEBUG
116 {
117 mp_ptr p = blk_ptr;
118 if (blk_size != 0)
119 {
120 if (p[-1] != (0xdeadbeef << 31) + 0xdeafdeed)
121 {
122 fprintf (stderr, "gmp: (free) data clobbered before allocation block\n");
123 abort ();
124 }
125 if (blk_size % BYTES_PER_MP_LIMB == 0)
126 if (p[blk_size / BYTES_PER_MP_LIMB] != ~((0xdeadbeef << 31) + 0xdeafdeed))
127 {
128 fprintf (stderr, "gmp: (free) data clobbered after allocation block\n");
129 abort ();
130 }
131 }
132 blk_ptr = p - 1;
133 }
134 #endif
135 free (blk_ptr);
136 }
137