source/libs/gmp/gmp-src/memory.c

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