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81cbc3bcae
No Bug. This commit expanding the range of tests / benchmarks for memmove and memcpy. The test expansion is mostly in the vein of increasing the maximum size, increasing the number of unique alignments tested, and testing both source < destination and vice versa. The benchmark expansaion is just to increase the number of unique alignments. test-memcpy, test-memccpy, test-mempcpy, test-memmove, and tst-memmove-overflow all pass. Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
316 lines
7.1 KiB
C
316 lines
7.1 KiB
C
/* Test and measure memcpy functions.
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Copyright (C) 1999-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Jakub Jelinek <jakub@redhat.com>, 1999.
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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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#ifndef MEMCPY_RESULT
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# define MEMCPY_RESULT(dst, len) dst
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# define MIN_PAGE_SIZE 131072
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# define TEST_MAIN
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# define TEST_NAME "memcpy"
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# include "test-string.h"
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char *simple_memcpy (char *, const char *, size_t);
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char *builtin_memcpy (char *, const char *, size_t);
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IMPL (simple_memcpy, 0)
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IMPL (builtin_memcpy, 0)
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IMPL (memcpy, 1)
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char *
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simple_memcpy (char *dst, const char *src, size_t n)
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{
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char *ret = dst;
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while (n--)
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*dst++ = *src++;
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return ret;
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}
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char *
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builtin_memcpy (char *dst, const char *src, size_t n)
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{
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return __builtin_memcpy (dst, src, n);
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}
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#endif
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typedef char *(*proto_t) (char *, const char *, size_t);
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static void
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do_one_test (impl_t *impl, char *dst, const char *src,
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size_t len)
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{
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size_t i;
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/* Must clear the destination buffer set by the previous run. */
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for (i = 0; i < len; i++)
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dst[i] = 0;
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if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
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{
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error (0, 0, "Wrong result in function %s %p %p", impl->name,
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CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
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ret = 1;
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return;
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}
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if (memcmp (dst, src, len) != 0)
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{
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error (0, 0, "Wrong result in function %s dst %p \"%.*s\" src %p \"%.*s\" len %zu",
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impl->name, dst, (int) len, dst, src, (int) len, src, len);
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ret = 1;
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return;
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}
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}
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static void
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do_test (size_t align1, size_t align2, size_t len)
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{
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size_t i, j;
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char *s1, *s2;
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align1 &= 4095;
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if (align1 + len >= page_size)
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return;
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align2 &= 4095;
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if (align2 + len >= page_size)
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return;
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s1 = (char *) (buf1 + align1);
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s2 = (char *) (buf2 + align2);
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for (i = 0, j = 1; i < len; i++, j += 23)
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s1[i] = j;
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s2, s1, len);
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}
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static void
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do_random_tests (void)
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{
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size_t i, j, n, align1, align2, len, size1, size2, size;
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int c;
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unsigned char *p1, *p2;
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unsigned char *res;
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for (n = 0; n < ITERATIONS; n++)
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{
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if (n == 0)
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{
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len = getpagesize ();
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size = len + 512;
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size1 = size;
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size2 = size;
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align1 = 512;
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align2 = 512;
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}
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else
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{
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if ((random () & 255) == 0)
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size = 65536;
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else
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size = 768;
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if (size > page_size)
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size = page_size;
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size1 = size;
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size2 = size;
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i = random ();
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if (i & 3)
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size -= 256;
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if (i & 1)
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size1 -= 256;
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if (i & 2)
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size2 -= 256;
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if (i & 4)
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{
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len = random () % size;
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align1 = size1 - len - (random () & 31);
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align2 = size2 - len - (random () & 31);
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if (align1 > size1)
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align1 = 0;
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if (align2 > size2)
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align2 = 0;
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}
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else
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{
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align1 = random () & 63;
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align2 = random () & 63;
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len = random () % size;
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if (align1 + len > size1)
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align1 = size1 - len;
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if (align2 + len > size2)
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align2 = size2 - len;
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}
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}
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p1 = buf1 + page_size - size1;
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p2 = buf2 + page_size - size2;
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c = random () & 255;
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j = align1 + len + 256;
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if (j > size1)
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j = size1;
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for (i = 0; i < j; ++i)
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p1[i] = random () & 255;
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FOR_EACH_IMPL (impl, 1)
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{
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j = align2 + len + 256;
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if (j > size2)
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j = size2;
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memset (p2, c, j);
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res = (unsigned char *) CALL (impl,
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(char *) (p2 + align2),
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(char *) (p1 + align1), len);
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if (res != MEMCPY_RESULT (p2 + align2, len))
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{
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error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
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n, impl->name, align1, align2, len, res,
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MEMCPY_RESULT (p2 + align2, len));
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ret = 1;
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}
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for (i = 0; i < align2; ++i)
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{
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if (p2[i] != c)
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{
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error (0, 0, "Iteration %zd - garbage before, %s (%zd, %zd, %zd)",
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n, impl->name, align1, align2, len);
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ret = 1;
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break;
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}
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}
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for (i = align2 + len; i < j; ++i)
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{
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if (p2[i] != c)
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{
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error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
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n, impl->name, align1, align2, len);
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ret = 1;
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break;
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}
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}
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if (memcmp (p1 + align1, p2 + align2, len))
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{
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error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
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n, impl->name, align1, align2, len);
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ret = 1;
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}
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}
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}
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}
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static void
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do_test1 (size_t size)
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{
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void *large_buf;
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large_buf = mmap (NULL, size * 2 + page_size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANON, -1, 0);
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if (large_buf == MAP_FAILED)
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{
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puts ("Failed to allocat large_buf, skipping do_test1");
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return;
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}
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if (mprotect (large_buf + size, page_size, PROT_NONE))
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error (EXIT_FAILURE, errno, "mprotect failed");
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size_t arrary_size = size / sizeof (uint32_t);
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uint32_t *dest = large_buf;
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uint32_t *src = large_buf + size + page_size;
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size_t i;
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size_t repeats;
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for(repeats = 0; repeats < 2; repeats++)
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{
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for (i = 0; i < arrary_size; i++)
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src[i] = (uint32_t) i;
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FOR_EACH_IMPL (impl, 0)
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{
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printf ("\t\tRunning: %s\n", impl->name);
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memset (dest, -1, size);
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CALL (impl, (char *) dest, (char *) src, size);
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for (i = 0; i < arrary_size; i++)
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if (dest[i] != src[i])
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{
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error (0, 0,
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"Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
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impl->name, dest, src, i);
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ret = 1;
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munmap ((void *) large_buf, size * 2 + page_size);
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return;
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}
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}
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dest = src;
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src = large_buf;
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}
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munmap ((void *) large_buf, size * 2 + page_size);
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}
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int
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test_main (void)
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{
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size_t i;
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test_init ();
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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 (i = 0; i < 18; ++i)
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{
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do_test (0, 0, 1 << i);
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do_test (i, 0, 1 << i);
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do_test (0, i, 1 << i);
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do_test (i, i, 1 << i);
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}
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for (i = 0; i < 32; ++i)
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{
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do_test (0, 0, i);
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do_test (i, 0, i);
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do_test (0, i, i);
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do_test (i, i, i);
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}
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for (i = 3; i < 32; ++i)
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{
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if ((i & (i - 1)) == 0)
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continue;
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do_test (0, 0, 16 * i);
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do_test (i, 0, 16 * i);
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do_test (0, i, 16 * i);
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do_test (i, i, 16 * i);
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}
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for (i = 19; i <= 25; ++i)
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{
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do_test (255, 0, 1 << i);
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do_test (0, 255, i);
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do_test (0, 4000, i);
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}
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do_test (0, 0, getpagesize ());
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do_random_tests ();
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do_test1 (0x100000);
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do_test1 (0x2000000);
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return ret;
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}
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#include <support/test-driver.c>
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