memory.c
上传用户:qaz666999
上传日期:2022-08-06
资源大小:2570k
文件大小:3k
- /* Memory allocation routines.
- Copyright 1991, 1993, 1994, 2000, 2001, 2002 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <stdlib.h> /* for malloc, realloc, free */
- #include "gmp.h"
- #include "gmp-impl.h"
- void * (*__gmp_allocate_func) __GMP_PROTO ((size_t)) = __gmp_default_allocate;
- void * (*__gmp_reallocate_func) __GMP_PROTO ((void *, size_t, size_t))
- = __gmp_default_reallocate;
- void (*__gmp_free_func) __GMP_PROTO ((void *, size_t)) = __gmp_default_free;
- /* Default allocation functions. In case of failure to allocate/reallocate
- an error message is written to stderr and the program aborts. */
- void *
- __gmp_default_allocate (size_t size)
- {
- void *ret;
- #ifdef DEBUG
- size_t req_size = size;
- size += 2 * BYTES_PER_MP_LIMB;
- #endif
- ret = malloc (size);
- if (ret == 0)
- {
- fprintf (stderr, "GNU MP: Cannot allocate memory (size=%lu)n", (long) size);
- abort ();
- }
- #ifdef DEBUG
- {
- mp_ptr p = ret;
- p++;
- p[-1] = (0xdeadbeef << 31) + 0xdeafdeed;
- if (req_size % BYTES_PER_MP_LIMB == 0)
- p[req_size / BYTES_PER_MP_LIMB] = ~((0xdeadbeef << 31) + 0xdeafdeed);
- ret = p;
- }
- #endif
- return ret;
- }
- void *
- __gmp_default_reallocate (void *oldptr, size_t old_size, size_t new_size)
- {
- void *ret;
- #ifdef DEBUG
- size_t req_size = new_size;
- if (old_size != 0)
- {
- mp_ptr p = oldptr;
- if (p[-1] != (0xdeadbeef << 31) + 0xdeafdeed)
- {
- fprintf (stderr, "gmp: (realloc) data clobbered before allocation blockn");
- abort ();
- }
- if (old_size % BYTES_PER_MP_LIMB == 0)
- if (p[old_size / BYTES_PER_MP_LIMB] != ~((0xdeadbeef << 31) + 0xdeafdeed))
- {
- fprintf (stderr, "gmp: (realloc) data clobbered after allocation blockn");
- abort ();
- }
- oldptr = p - 1;
- }
- new_size += 2 * BYTES_PER_MP_LIMB;
- #endif
- ret = realloc (oldptr, new_size);
- if (ret == 0)
- {
- fprintf (stderr, "GNU MP: Cannot reallocate memory (old_size=%lu new_size=%lu)n", (long) old_size, (long) new_size);
- abort ();
- }
- #ifdef DEBUG
- {
- mp_ptr p = ret;
- p++;
- p[-1] = (0xdeadbeef << 31) + 0xdeafdeed;
- if (req_size % BYTES_PER_MP_LIMB == 0)
- p[req_size / BYTES_PER_MP_LIMB] = ~((0xdeadbeef << 31) + 0xdeafdeed);
- ret = p;
- }
- #endif
- return ret;
- }
- void
- __gmp_default_free (void *blk_ptr, size_t blk_size)
- {
- #ifdef DEBUG
- {
- mp_ptr p = blk_ptr;
- if (blk_size != 0)
- {
- if (p[-1] != (0xdeadbeef << 31) + 0xdeafdeed)
- {
- fprintf (stderr, "gmp: (free) data clobbered before allocation blockn");
- abort ();
- }
- if (blk_size % BYTES_PER_MP_LIMB == 0)
- if (p[blk_size / BYTES_PER_MP_LIMB] != ~((0xdeadbeef << 31) + 0xdeafdeed))
- {
- fprintf (stderr, "gmp: (free) data clobbered after allocation blockn");
- abort ();
- }
- }
- blk_ptr = p - 1;
- }
- #endif
- free (blk_ptr);
- }