string/test-strcmp.c

   1 /* Test and measure strcmp and wcscmp functions.
   2    Copyright (C) 1999-2012 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Jakub Jelinek <jakub@redhat.com>, 1999.
   5    Added wcscmp support by Liubov Dmitrieva <liubov.dmitrieva@gmail.com>, 2011.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #define TEST_MAIN
  22 #include "test-string.h"
  23
  24 #ifdef WIDE
  25 # include <wchar.h>
  26
  27 # define L(str) L##str
  28 # define STRCMP wcscmp
  29 # define STRCPY wcscpy
  30 # define STRLEN wcslen
  31 # define MEMCPY wmemcpy
  32 # define SIMPLE_STRCMP simple_wcscmp
  33 # define STUPID_STRCMP stupid_wcscmp
  34 # define CHAR wchar_t
  35 # define UCHAR wchar_t
  36 # define CHARBYTES 4
  37 # define CHARBYTESLOG 2
  38 # define CHARALIGN __alignof__ (CHAR)
  39 # define MIDCHAR 0x7fffffff
  40 # define LARGECHAR 0xfffffffe
  41 # define CHAR__MAX WCHAR_MAX
  42 # define CHAR__MIN WCHAR_MIN
  43
  44 /* Wcscmp uses signed semantics for comparison, not unsigned */
  45 /* Avoid using substraction since possible overflow */
  46
  47 int
  48 simple_wcscmp (const wchar_t *s1, const wchar_t *s2)
  49 {
  50   wchar_t c1, c2;
  51   do
  52     {
  53       c1 = *s1++;
  54       c2 = *s2++;
  55       if (c2 == L'\0')
  56       return c1 - c2;
  57     }
  58   while (c1 == c2);
  59
  60   return c1 < c2 ? -1 : 1;
  61 }
  62
  63 int
  64 stupid_wcscmp (const wchar_t *s1, const wchar_t *s2)
  65 {
  66   size_t ns1 = wcslen (s1) + 1;
  67   size_t ns2 = wcslen (s2) + 1;
  68   size_t n = ns1 < ns2 ? ns1 : ns2;
  69   int ret = 0;
  70
  71   wchar_t c1, c2;
  72
  73   while (n--) {
  74     c1 = *s1++;
  75     c2 = *s2++;
  76     if ((ret = c1 < c2 ? -1 : c1 == c2 ? 0 : 1) != 0)
  77       break;
  78   }
  79   return ret;
  80 }
  81
  82 #else
  83 # include <limits.h>
  84
  85 # define L(str) str
  86 # define STRCMP strcmp
  87 # define STRCPY strcpy
  88 # define STRLEN strlen
  89 # define MEMCPY memcpy
  90 # define SIMPLE_STRCMP simple_strcmp
  91 # define STUPID_STRCMP stupid_strcmp
  92 # define CHAR char
  93 # define UCHAR unsigned char
  94 # define CHARBYTES 1
  95 # define CHARBYTESLOG 0
  96 # define CHARALIGN 1
  97 # define MIDCHAR 0x7f
  98 # define LARGECHAR 0xfe
  99 # define CHAR__MAX CHAR_MAX
 100 # define CHAR__MIN CHAR_MIN
 101
 102 /* Strcmp uses unsigned semantics for comparison. */
 103 int
 104 simple_strcmp (const char *s1, const char *s2)
 105 {
 106   int ret;
 107
 108   while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++);
 109   return ret;
 110 }
 111
 112 int
 113 stupid_strcmp (const char *s1, const char *s2)
 114 {
 115   size_t ns1 = strlen (s1) + 1;
 116   size_t ns2 = strlen (s2) + 1;
 117   size_t n = ns1 < ns2 ? ns1 : ns2;
 118   int ret = 0;
 119
 120   while (n--)
 121     if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0)
 122       break;
 123   return ret;
 124 }
 125 #endif
 126
 127 typedef int (*proto_t) (const CHAR *, const CHAR *);
 128
 129 IMPL (STUPID_STRCMP, 1)
 130 IMPL (SIMPLE_STRCMP, 1)
 131 IMPL (STRCMP, 1)
 132
 133 static int
 134 check_result (impl_t *impl,
 135              const CHAR *s1, const CHAR *s2,
 136              int exp_result)
 137 {
 138   int result = CALL (impl, s1, s2);
 139   if ((exp_result == 0 && result != 0)
 140       || (exp_result < 0 && result >= 0)
 141       || (exp_result > 0 && result <= 0))
 142     {
 143       error (0, 0, "Wrong result in function %s %d %d", impl->name,
 144              result, exp_result);
 145       ret = 1;
 146       return -1;
 147     }
 148
 149   return 0;
 150 }
 151
 152 static void
 153 do_one_test (impl_t *impl,
 154              const CHAR *s1, const CHAR *s2,
 155              int exp_result)
 156 {
 157   if (check_result (impl, s1, s2, exp_result) < 0)
 158     return;
 159
 160   if (HP_TIMING_AVAIL)
 161     {
 162       hp_timing_t start __attribute ((unused));
 163       hp_timing_t stop __attribute ((unused));
 164       hp_timing_t best_time = ~ (hp_timing_t) 0;
 165       size_t i;
 166
 167       for (i = 0; i < 32; ++i)
 168         {
 169           HP_TIMING_NOW (start);
 170           CALL (impl, s1, s2);
 171           HP_TIMING_NOW (stop);
 172           HP_TIMING_BEST (best_time, start, stop);
 173         }
 174
 175       printf ("\t%zd", (size_t) best_time);
 176     }
 177 }
 178
 179 static void
 180 do_test (size_t align1, size_t align2, size_t len, int max_char,
 181          int exp_result)
 182 {
 183   size_t i;
 184
 185   CHAR *s1, *s2;
 186
 187   if (len == 0)
 188     return;
 189
 190   align1 &= 63;
 191   if (align1 + (len + 1) * CHARBYTES >= page_size)
 192     return;
 193
 194   align2 &= 63;
 195   if (align2 + (len + 1) * CHARBYTES >= page_size)
 196     return;
 197
 198   /* Put them close to the end of page.  */
 199   i = align1 + CHARBYTES * (len + 2);
 200   s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1);
 201   i = align2 + CHARBYTES * (len + 2);
 202   s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16)  + align2);
 203
 204   for (i = 0; i < len; i++)
 205     s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
 206
 207   s1[len] = s2[len] = 0;
 208   s1[len + 1] = 23;
 209   s2[len + 1] = 24 + exp_result;
 210   s2[len - 1] -= exp_result;
 211
 212   if (HP_TIMING_AVAIL)
 213     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 214
 215   FOR_EACH_IMPL (impl, 0)
 216     do_one_test (impl, s1, s2, exp_result);
 217
 218   if (HP_TIMING_AVAIL)
 219     putchar ('\n');
 220 }
 221
 222 static void
 223 do_random_tests (void)
 224 {
 225         UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES);
 226         UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES);
 227
 228         for (size_t n = 0; n < ITERATIONS; n++)
 229           {
 230             /* for wcscmp case align1 and align2 mean here alignment
 231                in wchar_t symbols, it equal 4*k alignment in bytes, we
 232                don't check other alignments like for example
 233                p1 = (wchar_t *)(buf1 + 1)
 234                because it's wrong using of wchar_t type.  */
 235             size_t align1 = random () & 31;
 236             size_t align2;
 237             if (random () & 1)
 238               align2 = random () & 31;
 239             else
 240               align2 = align1 + (random () & 24);
 241             size_t pos = random () & 511;
 242             size_t j = align1 > align2 ? align1 : align2;
 243             if (pos + j >= 511)
 244               pos = 510 - j - (random () & 7);
 245             size_t len1 = random () & 511;
 246             if (pos >= len1 && (random () & 1))
 247               len1 = pos + (random () & 7);
 248             if (len1 + j >= 512)
 249               len1 = 511 - j - (random () & 7);
 250             size_t len2;
 251             if (pos >= len1)
 252               len2 = len1;
 253             else
 254               len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0);
 255             j = (pos > len2 ? pos : len2) + align1 + 64;
 256             if (j > 512)
 257               j = 512;
 258             for (size_t i = 0; i < j; ++i)
 259               {
 260                 p1[i] = random () & 255;
 261                 if (i < len1 + align1 && !p1[i])
 262                   {
 263                     p1[i] = random () & 255;
 264                     if (!p1[i])
 265                       p1[i] = 1 + (random () & 127);
 266                   }
 267               }
 268             for (size_t i = 0; i < j; ++i)
 269               {
 270                 p2[i] = random () & 255;
 271                 if (i < len2 + align2 && !p2[i])
 272                   {
 273                     p2[i] = random () & 255;
 274                     if (!p2[i])
 275                       p2[i] = 1 + (random () & 127);
 276                   }
 277               }
 278
 279             int result = 0;
 280             MEMCPY (p2 + align2, p1 + align1, pos);
 281             if (pos < len1)
 282               {
 283                 if (p2[align2 + pos] == p1[align1 + pos])
 284                   {
 285                     p2[align2 + pos] = random () & 255;
 286                     if (p2[align2 + pos] == p1[align1 + pos])
 287                       p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
 288                   }
 289
 290                 if (p1[align1 + pos] < p2[align2 + pos])
 291                   result = -1;
 292                 else
 293                   result = 1;
 294               }
 295             p1[len1 + align1] = 0;
 296             p2[len2 + align2] = 0;
 297
 298             FOR_EACH_IMPL (impl, 1)
 299               {
 300                 int r = CALL (impl, (CHAR *) (p1 + align1), (CHAR *) (p2 + align2));
 301                 /* Test whether on 64-bit architectures where ABI requires
 302                    callee to promote has the promotion been done.  */
 303                 asm ("" : "=g" (r) : "0" (r));
 304                 if ((r == 0 && result)
 305                     || (r < 0 && result >= 0)
 306                     || (r > 0 && result <= 0))
 307                   {
 308                     error (0, 0, "Iteration %zd - wrong result in function %s (align in bytes: %zd, align in bytes: %zd, len1:  %zd, len2: %zd, pos: %zd) %d != %d, p1 %p p2 %p",
 309                            n, impl->name, (size_t) (p1 + align1) & 63, (size_t) (p1 + align2) & 63, len1, len2, pos, r, result, p1, p2);
 310                     ret = 1;
 311                   }
 312               }
 313      }
 314 }
 315
 316 static void
 317 check (void)
 318 {
 319   CHAR *s1 = (CHAR *) (buf1 + 0xb2c);
 320   CHAR *s2 = (CHAR *) (buf1 + 0xfd8);
 321
 322   STRCPY(s1, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs"));
 323   STRCPY(s2, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV"));
 324
 325   /* Check correct working for negatives values */
 326
 327   s1[0] = 1;
 328   s2[0] = 1;
 329   s1[1] = 1;
 330   s2[1] = 1;
 331   s1[2] = -1;
 332   s2[2] = 3;
 333   s1[3] = 0;
 334   s2[3] = -1;
 335
 336   /* Check possible overflow bug, actual more for wcscmp */
 337
 338   s1[7] = CHAR__MIN;
 339   s2[7] = CHAR__MAX;
 340
 341   size_t l1 = STRLEN (s1);
 342   size_t l2 = STRLEN (s2);
 343
 344   for (size_t i1 = 0; i1 < l1; i1++)
 345     for (size_t i2 = 0; i2 < l2; i2++)
 346       {
 347                 int exp_result = SIMPLE_STRCMP (s1 + i1, s2 + i2);
 348                 FOR_EACH_IMPL (impl, 0)
 349                 check_result (impl, s1 + i1, s2 + i2, exp_result);
 350       }
 351 }
 352
 353
 354 int
 355 test_main (void)
 356 {
 357   size_t i;
 358
 359   test_init ();
 360   check();
 361
 362   printf ("%23s", "");
 363   FOR_EACH_IMPL (impl, 0)
 364     printf ("\t%s", impl->name);
 365   putchar ('\n');
 366
 367   for (i = 1; i < 32; ++i)
 368     {
 369       do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0);
 370       do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1);
 371       do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1);
 372     }
 373
 374   for (i = 1; i < 10 + CHARBYTESLOG; ++i)
 375     {
 376       do_test (0, 0, 2 << i, MIDCHAR, 0);
 377       do_test (0, 0, 2 << i, LARGECHAR, 0);
 378       do_test (0, 0, 2 << i, MIDCHAR, 1);
 379       do_test (0, 0, 2 << i, LARGECHAR, 1);
 380       do_test (0, 0, 2 << i, MIDCHAR, -1);
 381       do_test (0, 0, 2 << i, LARGECHAR, -1);
 382       do_test (0, CHARBYTES * i, 2 << i, MIDCHAR, 1);
 383       do_test (CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1);
 384     }
 385
 386   for (i = 1; i < 8; ++i)
 387     {
 388       do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0);
 389       do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0);
 390       do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1);
 391       do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1);
 392       do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1);
 393       do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1);
 394     }
 395
 396   do_random_tests ();
 397   return ret;
 398 }
 399
 400 #include "../test-skeleton.c"