1/* Memory allocation routines.
2
3Copyright 1991, 1993, 1994, 2000-2002, 2012 Free Software Foundation, Inc.
4
5This file is part of the GNU MP Library.
6
7The GNU MP Library is free software; you can redistribute it and/or modify
8it under the terms of either:
9
10  * the GNU Lesser General Public License as published by the Free
11    Software Foundation; either version 3 of the License, or (at your
12    option) any later version.
13
14or
15
16  * the GNU General Public License as published by the Free Software
17    Foundation; either version 2 of the License, or (at your option) any
18    later version.
19
20or both in parallel, as here.
21
22The GNU MP Library is distributed in the hope that it will be useful, but
23WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
25for more details.
26
27You should have received copies of the GNU General Public License and the
28GNU Lesser General Public License along with the GNU MP Library.  If not,
29see https://www.gnu.org/licenses/.  */
30
31#include <stdio.h>
32#include <stdlib.h> /* for malloc, realloc, free */
33
34#include "gmp-impl.h"
35
36
37void * (*__gmp_allocate_func) (size_t) = __gmp_default_allocate;
38void * (*__gmp_reallocate_func) (void *, size_t, size_t) = __gmp_default_reallocate;
39void   (*__gmp_free_func) (void *, size_t) = __gmp_default_free;
40
41
42/* Default allocation functions.  In case of failure to allocate/reallocate
43   an error message is written to stderr and the program aborts.  */
44
45void *
46__gmp_default_allocate (size_t size)
47{
48  void *ret;
49#ifdef DEBUG
50  size_t req_size = size;
51  size += 2 * GMP_LIMB_BYTES;
52#endif
53  ret = malloc (size);
54  if (ret == 0)
55    {
56      fprintf (stderr, "GNU MP: Cannot allocate memory (size=%lu)\n", (long) size);
57      abort ();
58    }
59
60#ifdef DEBUG
61  {
62    mp_ptr p = ret;
63    p++;
64    p[-1] = (0xdeadbeef << 31) + 0xdeafdeed;
65    if (req_size % GMP_LIMB_BYTES == 0)
66      p[req_size / GMP_LIMB_BYTES] = ~((0xdeadbeef << 31) + 0xdeafdeed);
67    ret = p;
68  }
69#endif
70  return ret;
71}
72
73void *
74__gmp_default_reallocate (void *oldptr, size_t old_size, size_t new_size)
75{
76  void *ret;
77
78#ifdef DEBUG
79  size_t req_size = new_size;
80
81  if (old_size != 0)
82    {
83      mp_ptr p = oldptr;
84      if (p[-1] != (0xdeadbeef << 31) + 0xdeafdeed)
85	{
86	  fprintf (stderr, "gmp: (realloc) data clobbered before allocation block\n");
87	  abort ();
88	}
89      if (old_size % GMP_LIMB_BYTES == 0)
90	if (p[old_size / GMP_LIMB_BYTES] != ~((0xdeadbeef << 31) + 0xdeafdeed))
91	  {
92	    fprintf (stderr, "gmp: (realloc) data clobbered after allocation block\n");
93	    abort ();
94	  }
95      oldptr = p - 1;
96    }
97
98  new_size += 2 * GMP_LIMB_BYTES;
99#endif
100
101  ret = realloc (oldptr, new_size);
102  if (ret == 0)
103    {
104      fprintf (stderr, "GNU MP: Cannot reallocate memory (old_size=%lu new_size=%lu)\n", (long) old_size, (long) new_size);
105      abort ();
106    }
107
108#ifdef DEBUG
109  {
110    mp_ptr p = ret;
111    p++;
112    p[-1] = (0xdeadbeef << 31) + 0xdeafdeed;
113    if (req_size % GMP_LIMB_BYTES == 0)
114      p[req_size / GMP_LIMB_BYTES] = ~((0xdeadbeef << 31) + 0xdeafdeed);
115    ret = p;
116  }
117#endif
118  return ret;
119}
120
121void
122__gmp_default_free (void *blk_ptr, size_t blk_size)
123{
124#ifdef DEBUG
125  {
126    mp_ptr p = blk_ptr;
127    if (blk_size != 0)
128      {
129	if (p[-1] != (0xdeadbeef << 31) + 0xdeafdeed)
130	  {
131	    fprintf (stderr, "gmp: (free) data clobbered before allocation block\n");
132	    abort ();
133	  }
134	if (blk_size % GMP_LIMB_BYTES == 0)
135	  if (p[blk_size / GMP_LIMB_BYTES] != ~((0xdeadbeef << 31) + 0xdeafdeed))
136	    {
137	      fprintf (stderr, "gmp: (free) data clobbered after allocation block\n");
138	      abort ();
139	    }
140      }
141    blk_ptr = p - 1;
142  }
143#endif
144  free (blk_ptr);
145}
146