diff options
| -rw-r--r-- | memory.c | 70 |
1 files changed, 68 insertions, 2 deletions
@@ -48,14 +48,27 @@ _mp_default_allocate (size) #endif { void *ret; - +#ifdef DEBUG + size_t req_size = size; + size += 2 * BYTES_PER_MP_LIMB; +#endif ret = malloc (size); if (ret == 0) { perror ("cannot allocate in gmp"); 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; } @@ -71,6 +84,29 @@ _mp_default_reallocate (oldptr, old_size, 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 block\n"); + 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 block\n"); + abort (); + } + oldptr = p - 1; + } + + new_size += 2 * BYTES_PER_MP_LIMB; +#endif + ret = realloc (oldptr, new_size); if (ret == 0) { @@ -78,6 +114,16 @@ _mp_default_reallocate (oldptr, old_size, 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; } @@ -90,5 +136,25 @@ _mp_default_free (blk_ptr, blk_size) size_t blk_size; #endif { +#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 block\n"); + 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 block\n"); + abort (); + } + } + blk_ptr = p - 1; + } +#endif free (blk_ptr); } |