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Diffstat (limited to 'REORG.TODO/string/test-strcmp.c')
| -rw-r--r-- | REORG.TODO/string/test-strcmp.c | 409 |
1 files changed, 409 insertions, 0 deletions
diff --git a/REORG.TODO/string/test-strcmp.c b/REORG.TODO/string/test-strcmp.c new file mode 100644 index 0000000000..f7af219149 --- /dev/null +++ b/REORG.TODO/string/test-strcmp.c @@ -0,0 +1,409 @@ +/* Test and measure strcmp and wcscmp functions. + Copyright (C) 1999-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Written by Jakub Jelinek <jakub@redhat.com>, 1999. + Added wcscmp support by Liubov Dmitrieva <liubov.dmitrieva@gmail.com>, 2011. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#define TEST_MAIN +#ifdef WIDE +# define TEST_NAME "wcscmp" +#else +# define TEST_NAME "strcmp" +#endif +#include "test-string.h" + +#ifdef WIDE +# include <wchar.h> + +# define L(str) L##str +# define STRCMP wcscmp +# define STRCPY wcscpy +# define STRLEN wcslen +# define MEMCPY wmemcpy +# define SIMPLE_STRCMP simple_wcscmp +# define STUPID_STRCMP stupid_wcscmp +# define CHAR wchar_t +# define UCHAR wchar_t +# define CHARBYTES 4 +# define CHARBYTESLOG 2 +# define CHARALIGN __alignof__ (CHAR) +# define MIDCHAR 0x7fffffff +# define LARGECHAR 0xfffffffe +# define CHAR__MAX WCHAR_MAX +# define CHAR__MIN WCHAR_MIN + +/* Wcscmp uses signed semantics for comparison, not unsigned */ +/* Avoid using substraction since possible overflow */ + +int +simple_wcscmp (const wchar_t *s1, const wchar_t *s2) +{ + wchar_t c1, c2; + do + { + c1 = *s1++; + c2 = *s2++; + if (c2 == L'\0') + return c1 - c2; + } + while (c1 == c2); + + return c1 < c2 ? -1 : 1; +} + +int +stupid_wcscmp (const wchar_t *s1, const wchar_t *s2) +{ + size_t ns1 = wcslen (s1) + 1; + size_t ns2 = wcslen (s2) + 1; + size_t n = ns1 < ns2 ? ns1 : ns2; + int ret = 0; + + wchar_t c1, c2; + + while (n--) { + c1 = *s1++; + c2 = *s2++; + if ((ret = c1 < c2 ? -1 : c1 == c2 ? 0 : 1) != 0) + break; + } + return ret; +} + +#else +# include <limits.h> + +# define L(str) str +# define STRCMP strcmp +# define STRCPY strcpy +# define STRLEN strlen +# define MEMCPY memcpy +# define SIMPLE_STRCMP simple_strcmp +# define STUPID_STRCMP stupid_strcmp +# define CHAR char +# define UCHAR unsigned char +# define CHARBYTES 1 +# define CHARBYTESLOG 0 +# define CHARALIGN 1 +# define MIDCHAR 0x7f +# define LARGECHAR 0xfe +# define CHAR__MAX CHAR_MAX +# define CHAR__MIN CHAR_MIN + +/* Strcmp uses unsigned semantics for comparison. */ +int +simple_strcmp (const char *s1, const char *s2) +{ + int ret; + + while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++); + return ret; +} + +int +stupid_strcmp (const char *s1, const char *s2) +{ + size_t ns1 = strlen (s1) + 1; + size_t ns2 = strlen (s2) + 1; + size_t n = ns1 < ns2 ? ns1 : ns2; + int ret = 0; + + while (n--) + if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0) + break; + return ret; +} +#endif + +typedef int (*proto_t) (const CHAR *, const CHAR *); + +IMPL (STUPID_STRCMP, 1) +IMPL (SIMPLE_STRCMP, 1) +IMPL (STRCMP, 1) + +static int +check_result (impl_t *impl, + const CHAR *s1, const CHAR *s2, + int exp_result) +{ + int result = CALL (impl, s1, s2); + if ((exp_result == 0 && result != 0) + || (exp_result < 0 && result >= 0) + || (exp_result > 0 && result <= 0)) + { + error (0, 0, "Wrong result in function %s %d %d", impl->name, + result, exp_result); + ret = 1; + return -1; + } + + return 0; +} + +static void +do_one_test (impl_t *impl, + const CHAR *s1, const CHAR *s2, + int exp_result) +{ + if (check_result (impl, s1, s2, exp_result) < 0) + return; +} + +static void +do_test (size_t align1, size_t align2, size_t len, int max_char, + int exp_result) +{ + size_t i; + + CHAR *s1, *s2; + + if (len == 0) + return; + + align1 &= 63; + if (align1 + (len + 1) * CHARBYTES >= page_size) + return; + + align2 &= 63; + if (align2 + (len + 1) * CHARBYTES >= page_size) + return; + + /* Put them close to the end of page. */ + i = align1 + CHARBYTES * (len + 2); + s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1); + i = align2 + CHARBYTES * (len + 2); + s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16) + align2); + + for (i = 0; i < len; i++) + s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; + + s1[len] = s2[len] = 0; + s1[len + 1] = 23; + s2[len + 1] = 24 + exp_result; + s2[len - 1] -= exp_result; + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, s1, s2, exp_result); +} + +static void +do_random_tests (void) +{ + UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES); + UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES); + + for (size_t n = 0; n < ITERATIONS; n++) + { + /* for wcscmp case align1 and align2 mean here alignment + in wchar_t symbols, it equal 4*k alignment in bytes, we + don't check other alignments like for example + p1 = (wchar_t *)(buf1 + 1) + because it's wrong using of wchar_t type. */ + size_t align1 = random () & 31; + size_t align2; + if (random () & 1) + align2 = random () & 31; + else + align2 = align1 + (random () & 24); + size_t pos = random () & 511; + size_t j = align1 > align2 ? align1 : align2; + if (pos + j >= 511) + pos = 510 - j - (random () & 7); + size_t len1 = random () & 511; + if (pos >= len1 && (random () & 1)) + len1 = pos + (random () & 7); + if (len1 + j >= 512) + len1 = 511 - j - (random () & 7); + size_t len2; + if (pos >= len1) + len2 = len1; + else + len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0); + j = (pos > len2 ? pos : len2) + align1 + 64; + if (j > 512) + j = 512; + for (size_t i = 0; i < j; ++i) + { + p1[i] = random () & 255; + if (i < len1 + align1 && !p1[i]) + { + p1[i] = random () & 255; + if (!p1[i]) + p1[i] = 1 + (random () & 127); + } + } + for (size_t i = 0; i < j; ++i) + { + p2[i] = random () & 255; + if (i < len2 + align2 && !p2[i]) + { + p2[i] = random () & 255; + if (!p2[i]) + p2[i] = 1 + (random () & 127); + } + } + + int result = 0; + MEMCPY (p2 + align2, p1 + align1, pos); + if (pos < len1) + { + if (p2[align2 + pos] == p1[align1 + pos]) + { + p2[align2 + pos] = random () & 255; + if (p2[align2 + pos] == p1[align1 + pos]) + p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127); + } + + if (p1[align1 + pos] < p2[align2 + pos]) + result = -1; + else + result = 1; + } + p1[len1 + align1] = 0; + p2[len2 + align2] = 0; + + FOR_EACH_IMPL (impl, 1) + { + int r = CALL (impl, (CHAR *) (p1 + align1), (CHAR *) (p2 + align2)); + /* Test whether on 64-bit architectures where ABI requires + callee to promote has the promotion been done. */ + asm ("" : "=g" (r) : "0" (r)); + if ((r == 0 && result) + || (r < 0 && result >= 0) + || (r > 0 && result <= 0)) + { + 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", + n, impl->name, (size_t) (p1 + align1) & 63, (size_t) (p1 + align2) & 63, len1, len2, pos, r, result, p1, p2); + ret = 1; + } + } + } +} + +static void +check (void) +{ + CHAR *s1 = (CHAR *) (buf1 + 0xb2c); + CHAR *s2 = (CHAR *) (buf1 + 0xfd8); + + STRCPY(s1, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs")); + STRCPY(s2, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV")); + + /* Check correct working for negatives values */ + + s1[0] = 1; + s2[0] = 1; + s1[1] = 1; + s2[1] = 1; + s1[2] = -1; + s2[2] = 3; + s1[3] = 0; + s2[3] = -1; + + /* Check possible overflow bug, actual more for wcscmp */ + + s1[7] = CHAR__MIN; + s2[7] = CHAR__MAX; + + size_t l1 = STRLEN (s1); + size_t l2 = STRLEN (s2); + + for (size_t i1 = 0; i1 < l1; i1++) + for (size_t i2 = 0; i2 < l2; i2++) + { + int exp_result = SIMPLE_STRCMP (s1 + i1, s2 + i2); + FOR_EACH_IMPL (impl, 0) + check_result (impl, s1 + i1, s2 + i2, exp_result); + } + + /* Test cases where there are multiple zero bytes after the first. */ + + for (size_t i = 0; i < 16 + 1; i++) + { + s1[i] = 0x00; + s2[i] = 0x00; + } + + for (size_t i = 0; i < 16; i++) + { + int exp_result; + + for (int val = 0x01; val < 0x100; val++) + { + for (size_t j = 0; j < i; j++) + { + s1[j] = val; + s2[j] = val; + } + + s2[i] = val; + + exp_result = SIMPLE_STRCMP (s1, s2); + FOR_EACH_IMPL (impl, 0) + check_result (impl, s1, s2, exp_result); + } + } +} + + +int +test_main (void) +{ + size_t i; + + test_init (); + check(); + + printf ("%23s", ""); + FOR_EACH_IMPL (impl, 0) + printf ("\t%s", impl->name); + putchar ('\n'); + + for (i = 1; i < 32; ++i) + { + do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0); + do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1); + do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1); + } + + for (i = 1; i < 10 + CHARBYTESLOG; ++i) + { + do_test (0, 0, 2 << i, MIDCHAR, 0); + do_test (0, 0, 2 << i, LARGECHAR, 0); + do_test (0, 0, 2 << i, MIDCHAR, 1); + do_test (0, 0, 2 << i, LARGECHAR, 1); + do_test (0, 0, 2 << i, MIDCHAR, -1); + do_test (0, 0, 2 << i, LARGECHAR, -1); + do_test (0, CHARBYTES * i, 2 << i, MIDCHAR, 1); + do_test (CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1); + } + + for (i = 1; i < 8; ++i) + { + do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0); + do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0); + do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1); + do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1); + do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1); + do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1); + } + + do_random_tests (); + return ret; +} + +#include <support/test-driver.c> |