benchtests/bench-string.h

   1 /* Measure string and memory functions.
   2    Copyright (C) 2013-2016 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/cdefs.h>
  20
  21 typedef struct
  22 {
  23   const char *name;
  24   void (*fn) (void);
  25   long test;
  26 } impl_t;
  27 extern impl_t __start_impls[], __stop_impls[];
  28
  29 #define IMPL(name, test) \
  30   impl_t tst_ ## name                                                   \
  31   __attribute__ ((section ("impls"), aligned (sizeof (void *))))        \
  32        = { __STRING (name), (void (*) (void))name, test };
  33
  34 #ifdef TEST_MAIN
  35
  36 # ifndef _GNU_SOURCE
  37 #  define _GNU_SOURCE
  38 # endif
  39
  40 # undef __USE_STRING_INLINES
  41
  42 # include <stdio.h>
  43 # include <stdlib.h>
  44 # include <string.h>
  45 # include <sys/mman.h>
  46 # include <sys/param.h>
  47 # include <unistd.h>
  48 # include <fcntl.h>
  49 # include <error.h>
  50 # include <errno.h>
  51 # include <time.h>
  52 # include <ifunc-impl-list.h>
  53 # define GL(x) _##x
  54 # define GLRO(x) _##x
  55 # include "bench-timing.h"
  56
  57
  58 # define TEST_FUNCTION test_main ()
  59 # ifndef TIMEOUT
  60 #  define TIMEOUT (4 * 60)
  61 # endif
  62 # define OPT_ITERATIONS 10000
  63 # define OPT_RANDOM 10001
  64 # define OPT_SEED 10002
  65
  66 # define INNER_LOOP_ITERS 64
  67
  68 unsigned char *buf1, *buf2;
  69 int ret, do_srandom;
  70 unsigned int seed;
  71 size_t page_size;
  72
  73 # ifndef ITERATIONS
  74 size_t iterations = 100000;
  75 #  define ITERATIONS_OPTIONS \
  76      { "iterations", required_argument, NULL, OPT_ITERATIONS },
  77 #  define ITERATIONS_PROCESS \
  78      case OPT_ITERATIONS:                                                     \
  79        iterations = strtoul (optarg, NULL, 0);                                \
  80        break;
  81 #  define ITERATIONS iterations
  82 # else
  83 #  define ITERATIONS_OPTIONS
  84 #  define ITERATIONS_PROCESS
  85 # endif
  86
  87 # define CMDLINE_OPTIONS ITERATIONS_OPTIONS \
  88     { "random", no_argument, NULL, OPT_RANDOM },                              \
  89     { "seed", required_argument, NULL, OPT_SEED },
  90 # define CMDLINE_PROCESS ITERATIONS_PROCESS \
  91     case OPT_RANDOM:                                                          \
  92       {                                                                       \
  93         int fdr = open ("/dev/urandom", O_RDONLY);                            \
  94                                                                               \
  95         if (fdr < 0 || read (fdr, &seed, sizeof(seed)) != sizeof (seed))      \
  96           seed = time (NULL);                                                 \
  97         if (fdr >= 0)                                                         \
  98           close (fdr);                                                        \
  99         do_srandom = 1;                                                       \
 100         break;                                                                \
 101       }                                                                       \
 102                                                                               \
 103     case OPT_SEED:                                                            \
 104       seed = strtoul (optarg, NULL, 0);                                       \
 105       do_srandom = 1;                                                         \
 106       break;
 107
 108 # define CALL(impl, ...)        \
 109     (* (proto_t) (impl)->fn) (__VA_ARGS__)
 110
 111 # ifdef TEST_NAME
 112 /* Increase size of FUNC_LIST if assert is triggered at run-time.  */
 113 static struct libc_ifunc_impl func_list[32];
 114 static int func_count;
 115 static int impl_count = -1;
 116 static impl_t *impl_array;
 117
 118 #  define FOR_EACH_IMPL(impl, notall) \
 119      impl_t *impl;                                                            \
 120      int count;                                                               \
 121      if (impl_count == -1)                                                    \
 122        {                                                                      \
 123          impl_count = 0;                                                      \
 124          if (func_count != 0)                                                 \
 125            {                                                                  \
 126              int f;                                                           \
 127              impl_t *skip = NULL, *a;                                         \
 128              for (impl = __start_impls; impl < __stop_impls; ++impl)          \
 129                if (strcmp (impl->name, TEST_NAME) == 0)                       \
 130                  skip = impl;                                                 \
 131                else                                                           \
 132                  impl_count++;                                                \
 133              a = impl_array = malloc ((impl_count + func_count) *             \
 134                                    sizeof (impl_t));                          \
 135              for (impl = __start_impls; impl < __stop_impls; ++impl)          \
 136                if (impl != skip)                                              \
 137                  *a++ = *impl;                                                \
 138              for (f = 0; f < func_count; f++)                                 \
 139                if (func_list[f].usable)                                       \
 140                  {                                                            \
 141                    a->name = func_list[f].name;                               \
 142                    a->fn = func_list[f].fn;                                   \
 143                    a->test = 1;                                               \
 144                    a++;                                                       \
 145                  }                                                            \
 146              impl_count = a - impl_array;                                     \
 147            }                                                                  \
 148          else                                                                 \
 149            {                                                                  \
 150              impl_count = __stop_impls - __start_impls;                       \
 151              impl_array = __start_impls;                                      \
 152            }                                                                  \
 153        }                                                                      \
 154      impl = impl_array;                                                       \
 155      for (count = 0; count < impl_count; ++count, ++impl)                     \
 156        if (!notall || impl->test)
 157 # else /* !TEST_NAME */
 158 #  define FOR_EACH_IMPL(impl, notall) \
 159      for (impl_t *impl = __start_impls; impl < __stop_impls; ++impl)          \
 160        if (!notall || impl->test)
 161 # endif /* !TEST_NAME */
 162
 163 # ifndef BUF1PAGES
 164 #  define BUF1PAGES 1
 165 # endif
 166
 167 static void
 168 test_init (void)
 169 {
 170 # ifdef TEST_NAME
 171   func_count = __libc_ifunc_impl_list (TEST_NAME, func_list,
 172                                        (sizeof func_list
 173                                         / sizeof func_list[0]));
 174 # endif
 175
 176   page_size = 2 * getpagesize ();
 177 # ifdef MIN_PAGE_SIZE
 178   if (page_size < MIN_PAGE_SIZE)
 179     page_size = MIN_PAGE_SIZE;
 180 # endif
 181   buf1 = mmap (0, (BUF1PAGES + 1) * page_size, PROT_READ | PROT_WRITE,
 182                MAP_PRIVATE | MAP_ANON, -1, 0);
 183   if (buf1 == MAP_FAILED)
 184     error (EXIT_FAILURE, errno, "mmap failed");
 185   if (mprotect (buf1 + BUF1PAGES * page_size, page_size, PROT_NONE))
 186     error (EXIT_FAILURE, errno, "mprotect failed");
 187   buf2 = mmap (0, 2 * page_size, PROT_READ | PROT_WRITE,
 188                MAP_PRIVATE | MAP_ANON, -1, 0);
 189   if (buf2 == MAP_FAILED)
 190     error (EXIT_FAILURE, errno, "mmap failed");
 191   if (mprotect (buf2 + page_size, page_size, PROT_NONE))
 192     error (EXIT_FAILURE, errno, "mprotect failed");
 193   if (do_srandom)
 194     {
 195       printf ("Setting seed to 0x%x\n", seed);
 196       srandom (seed);
 197     }
 198
 199   memset (buf1, 0xa5, BUF1PAGES * page_size);
 200   memset (buf2, 0x5a, page_size);
 201 }
 202
 203 #endif /* TEST_MAIN */