contrib/gmp/memory.c

   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 *
  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 *
  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
 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 }