string/test-memcpy.c

   1 /* Test and measure memcpy functions.
   2    Copyright (C) 1999-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Jakub Jelinek <jakub@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef MEMCPY_RESULT
  21 # define MEMCPY_RESULT(dst, len) dst
  22 # define MIN_PAGE_SIZE 131072
  23 # define TEST_MAIN
  24 # define TEST_NAME "memcpy"
  25 # include "test-string.h"
  26
  27 char *simple_memcpy (char *, const char *, size_t);
  28 char *builtin_memcpy (char *, const char *, size_t);
  29
  30 IMPL (simple_memcpy, 0)
  31 IMPL (builtin_memcpy, 0)
  32 IMPL (memcpy, 1)
  33
  34 char *
  35 simple_memcpy (char *dst, const char *src, size_t n)
  36 {
  37   char *ret = dst;
  38   while (n--)
  39     *dst++ = *src++;
  40   return ret;
  41 }
  42
  43 char *
  44 builtin_memcpy (char *dst, const char *src, size_t n)
  45 {
  46   return __builtin_memcpy (dst, src, n);
  47 }
  48 #endif
  49
  50 typedef char *(*proto_t) (char *, const char *, size_t);
  51
  52 static void
  53 do_one_test (impl_t *impl, char *dst, const char *src,
  54              size_t len)
  55 {
  56   if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
  57     {
  58       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  59              CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
  60       ret = 1;
  61       return;
  62     }
  63
  64   if (memcmp (dst, src, len) != 0)
  65     {
  66       error (0, 0, "Wrong result in function %s dst %p \"%.*s\" src %p \"%.*s\" len %zu",
  67              impl->name, dst, (int) len, dst, src, (int) len, src, len);
  68       ret = 1;
  69       return;
  70     }
  71 }
  72
  73 static void
  74 do_test (size_t align1, size_t align2, size_t len)
  75 {
  76   size_t i, j;
  77   char *s1, *s2;
  78
  79   align1 &= 63;
  80   if (align1 + len >= page_size)
  81     return;
  82
  83   align2 &= 63;
  84   if (align2 + len >= page_size)
  85     return;
  86
  87   s1 = (char *) (buf1 + align1);
  88   s2 = (char *) (buf2 + align2);
  89
  90   for (i = 0, j = 1; i < len; i++, j += 23)
  91     s1[i] = j;
  92
  93   FOR_EACH_IMPL (impl, 0)
  94     do_one_test (impl, s2, s1, len);
  95 }
  96
  97 static void
  98 do_random_tests (void)
  99 {
 100   size_t i, j, n, align1, align2, len, size1, size2, size;
 101   int c;
 102   unsigned char *p1, *p2;
 103   unsigned char *res;
 104
 105   for (n = 0; n < ITERATIONS; n++)
 106     {
 107       if (n == 0)
 108         {
 109           len = getpagesize ();
 110           size = len + 512;
 111           size1 = size;
 112           size2 = size;
 113           align1 = 512;
 114           align2 = 512;
 115         }
 116       else
 117         {
 118           if ((random () & 255) == 0)
 119             size = 65536;
 120           else
 121             size = 768;
 122           if (size > page_size)
 123             size = page_size;
 124           size1 = size;
 125           size2 = size;
 126           i = random ();
 127           if (i & 3)
 128             size -= 256;
 129           if (i & 1)
 130             size1 -= 256;
 131           if (i & 2)
 132             size2 -= 256;
 133           if (i & 4)
 134             {
 135               len = random () % size;
 136               align1 = size1 - len - (random () & 31);
 137               align2 = size2 - len - (random () & 31);
 138               if (align1 > size1)
 139                 align1 = 0;
 140               if (align2 > size2)
 141                 align2 = 0;
 142             }
 143           else
 144             {
 145               align1 = random () & 63;
 146               align2 = random () & 63;
 147               len = random () % size;
 148               if (align1 + len > size1)
 149                 align1 = size1 - len;
 150               if (align2 + len > size2)
 151                 align2 = size2 - len;
 152             }
 153         }
 154       p1 = buf1 + page_size - size1;
 155       p2 = buf2 + page_size - size2;
 156       c = random () & 255;
 157       j = align1 + len + 256;
 158       if (j > size1)
 159         j = size1;
 160       for (i = 0; i < j; ++i)
 161         p1[i] = random () & 255;
 162
 163       FOR_EACH_IMPL (impl, 1)
 164         {
 165           j = align2 + len + 256;
 166           if (j > size2)
 167             j = size2;
 168           memset (p2, c, j);
 169           res = (unsigned char *) CALL (impl,
 170                                         (char *) (p2 + align2),
 171                                         (char *) (p1 + align1), len);
 172           if (res != MEMCPY_RESULT (p2 + align2, len))
 173             {
 174               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
 175                      n, impl->name, align1, align2, len, res,
 176                      MEMCPY_RESULT (p2 + align2, len));
 177               ret = 1;
 178             }
 179           for (i = 0; i < align2; ++i)
 180             {
 181               if (p2[i] != c)
 182                 {
 183                   error (0, 0, "Iteration %zd - garbage before, %s (%zd, %zd, %zd)",
 184                          n, impl->name, align1, align2, len);
 185                   ret = 1;
 186                   break;
 187                 }
 188             }
 189           for (i = align2 + len; i < j; ++i)
 190             {
 191               if (p2[i] != c)
 192                 {
 193                   error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
 194                          n, impl->name, align1, align2, len);
 195                   ret = 1;
 196                   break;
 197                 }
 198             }
 199           if (memcmp (p1 + align1, p2 + align2, len))
 200             {
 201               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 202                      n, impl->name, align1, align2, len);
 203               ret = 1;
 204             }
 205         }
 206     }
 207 }
 208
 209 int
 210 test_main (void)
 211 {
 212   size_t i;
 213
 214   test_init ();
 215
 216   printf ("%23s", "");
 217   FOR_EACH_IMPL (impl, 0)
 218     printf ("\t%s", impl->name);
 219   putchar ('\n');
 220
 221   for (i = 0; i < 18; ++i)
 222     {
 223       do_test (0, 0, 1 << i);
 224       do_test (i, 0, 1 << i);
 225       do_test (0, i, 1 << i);
 226       do_test (i, i, 1 << i);
 227     }
 228
 229   for (i = 0; i < 32; ++i)
 230     {
 231       do_test (0, 0, i);
 232       do_test (i, 0, i);
 233       do_test (0, i, i);
 234       do_test (i, i, i);
 235     }
 236
 237   for (i = 3; i < 32; ++i)
 238     {
 239       if ((i & (i - 1)) == 0)
 240         continue;
 241       do_test (0, 0, 16 * i);
 242       do_test (i, 0, 16 * i);
 243       do_test (0, i, 16 * i);
 244       do_test (i, i, 16 * i);
 245     }
 246
 247   do_test (0, 0, getpagesize ());
 248
 249   do_random_tests ();
 250   return ret;
 251 }
 252
 253 #include "../test-skeleton.c"