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67e3b0c63c
In most cases the simple/stupid/builtin functions were in there to benchmark optimized implementations against. Only in some cases the functions are used to check expected results. Remove these tests from IMPL() and only keep them in wherever they're used for a specific purpose, e.g. to generate expected results. This improves timing of `make subdirs=string` by over a minute and a half (over 15%) on a Whiskey Lake laptop. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Noah Goldstein <libc-alpha@sourceware.org>
272 lines
6.8 KiB
C
272 lines
6.8 KiB
C
/* Test and measure strstr functions.
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Copyright (C) 2010-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define TEST_MAIN
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#define TEST_NAME "strstr"
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#include "test-string.h"
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#define STRSTR c_strstr
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#define libc_hidden_builtin_def(arg) /* nothing */
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#define __strnlen strnlen
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#include "strstr.c"
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/* Naive implementation to verify results. */
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static char *
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simple_strstr (const char *s1, const char *s2)
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{
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ssize_t s1len = strlen (s1);
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ssize_t s2len = strlen (s2);
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if (s2len > s1len)
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return NULL;
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for (ssize_t i = 0; i <= s1len - s2len; ++i)
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{
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size_t j;
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for (j = 0; j < s2len; ++j)
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if (s1[i + j] != s2[j])
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break;
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if (j == s2len)
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return (char *) s1 + i;
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}
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return NULL;
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}
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typedef char *(*proto_t) (const char *, const char *);
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IMPL (c_strstr, 0)
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IMPL (strstr, 1)
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static int
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check_result (impl_t *impl, const char *s1, const char *s2,
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char *exp_result)
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{
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char *result = CALL (impl, s1, s2);
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if (result != exp_result)
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{
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error (0, 0, "Wrong result in function %s %s %s", impl->name,
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(result == NULL) ? "(null)" : result,
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(exp_result == NULL) ? "(null)" : exp_result);
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ret = 1;
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return -1;
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}
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return 0;
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}
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static void
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do_one_test (impl_t *impl, const char *s1, const char *s2, char *exp_result)
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{
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if (check_result (impl, s1, s2, exp_result) < 0)
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return;
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}
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static void
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do_test (size_t align1, size_t align2, size_t len1, size_t len2,
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int fail)
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{
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char *s1 = (char *) (buf1 + align1);
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char *s2 = (char *) (buf2 + align2);
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static const char d[] = "1234567890abcdef";
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#define dl (sizeof (d) - 1)
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char *ss2 = s2;
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for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
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{
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size_t t = l > dl ? dl : l;
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ss2 = mempcpy (ss2, d, t);
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}
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s2[len2] = '\0';
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if (fail)
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{
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char *ss1 = s1;
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for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0)
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{
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size_t t = l > dl ? dl : l;
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memcpy (ss1, d, t);
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++ss1[len2 > 7 ? 7 : len2 - 1];
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ss1 += t;
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}
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}
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else
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{
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memset (s1, '0', len1);
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memcpy (s1 + len1 - len2, s2, len2);
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}
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s1[len1] = '\0';
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s1, s2, fail ? NULL : s1 + len1 - len2);
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}
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static void
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check1 (void)
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{
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const char s1[] =
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"F_BD_CE_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_C3_88_20_EF_BF_BD_EF_BF_BD_EF_BF_BD_C3_A7_20_EF_BF_BD";
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const char s2[] = "_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD";
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char *exp_result;
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exp_result = simple_strstr (s1, s2);
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, s1, s2, exp_result);
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}
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static void
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check2 (void)
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{
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const char s1_stack[] = ", enable_static, \0, enable_shared, ";
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const size_t s1_byte_count = 18;
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const char *s2_stack = &(s1_stack[s1_byte_count]);
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const size_t s2_byte_count = 18;
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char *exp_result;
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const size_t page_size_real = getpagesize ();
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/* Haystack at end of page. The following page is protected. */
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char *s1_page_end = (void *) buf1 + page_size - s1_byte_count;
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strcpy (s1_page_end, s1_stack);
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/* Haystack which crosses a page boundary.
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Note: page_size is at least 2 * getpagesize. See test_init. */
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char *s1_page_cross = (void *) buf1 + page_size_real - 8;
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strcpy (s1_page_cross, s1_stack);
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/* Needle at end of page. The following page is protected. */
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char *s2_page_end = (void *) buf2 + page_size - s2_byte_count;
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strcpy (s2_page_end, s2_stack);
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/* Needle which crosses a page boundary.
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Note: page_size is at least 2 * getpagesize. See test_init. */
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char *s2_page_cross = (void *) buf2 + page_size_real - 8;
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strcpy (s2_page_cross, s2_stack);
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exp_result = simple_strstr (s1_stack, s2_stack);
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FOR_EACH_IMPL (impl, 0)
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{
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check_result (impl, s1_stack, s2_stack, exp_result);
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check_result (impl, s1_stack, s2_page_end, exp_result);
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check_result (impl, s1_stack, s2_page_cross, exp_result);
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check_result (impl, s1_page_end, s2_stack, exp_result);
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check_result (impl, s1_page_end, s2_page_end, exp_result);
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check_result (impl, s1_page_end, s2_page_cross, exp_result);
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check_result (impl, s1_page_cross, s2_stack, exp_result);
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check_result (impl, s1_page_cross, s2_page_end, exp_result);
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check_result (impl, s1_page_cross, s2_page_cross, exp_result);
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}
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}
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#define N 1024
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static void
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pr23637 (void)
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{
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char *h = (char*) buf1;
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char *n = (char*) buf2;
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for (int i = 0; i < N; i++)
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{
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n[i] = 'x';
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h[i] = ' ';
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h[i + N] = 'x';
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}
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n[N] = '\0';
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h[N * 2] = '\0';
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/* Ensure we don't match at the first 'x'. */
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h[0] = 'x';
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char *exp_result = simple_strstr (h, n);
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, h, n, exp_result);
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}
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static int
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test_main (void)
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{
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test_init ();
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check1 ();
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check2 ();
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pr23637 ();
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printf ("%23s", "");
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FOR_EACH_IMPL (impl, 0)
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printf ("\t%s", impl->name);
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putchar ('\n');
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for (size_t klen = 2; klen < 32; ++klen)
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for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
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{
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do_test (0, 0, hlen, klen, 0);
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do_test (0, 0, hlen, klen, 1);
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do_test (0, 3, hlen, klen, 0);
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do_test (0, 3, hlen, klen, 1);
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do_test (0, 9, hlen, klen, 0);
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do_test (0, 9, hlen, klen, 1);
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do_test (0, 15, hlen, klen, 0);
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do_test (0, 15, hlen, klen, 1);
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do_test (3, 0, hlen, klen, 0);
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do_test (3, 0, hlen, klen, 1);
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do_test (3, 3, hlen, klen, 0);
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do_test (3, 3, hlen, klen, 1);
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do_test (3, 9, hlen, klen, 0);
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do_test (3, 9, hlen, klen, 1);
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do_test (3, 15, hlen, klen, 0);
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do_test (3, 15, hlen, klen, 1);
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do_test (9, 0, hlen, klen, 0);
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do_test (9, 0, hlen, klen, 1);
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do_test (9, 3, hlen, klen, 0);
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do_test (9, 3, hlen, klen, 1);
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do_test (9, 9, hlen, klen, 0);
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do_test (9, 9, hlen, klen, 1);
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do_test (9, 15, hlen, klen, 0);
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do_test (9, 15, hlen, klen, 1);
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do_test (15, 0, hlen, klen, 0);
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do_test (15, 0, hlen, klen, 1);
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do_test (15, 3, hlen, klen, 0);
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do_test (15, 3, hlen, klen, 1);
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do_test (15, 9, hlen, klen, 0);
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do_test (15, 9, hlen, klen, 1);
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do_test (15, 15, hlen, klen, 0);
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do_test (15, 15, hlen, klen, 1);
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do_test (15, 15, hlen + klen * 4, klen * 4, 0);
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do_test (15, 15, hlen + klen * 4, klen * 4, 1);
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}
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do_test (0, 0, page_size - 1, 16, 0);
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do_test (0, 0, page_size - 1, 16, 1);
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return ret;
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}
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#include <support/test-driver.c>
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