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 } 137