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/* Test for memalign chunk reuse.
Copyright (C) 2022-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <malloc.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <array_length.h>
#include <libc-pointer-arith.h>
#include <support/check.h>
typedef struct TestCase {
size_t size;
size_t alignment;
void *ptr1;
void *ptr2;
} TestCase;
static TestCase tcache_allocs[] = {
{ 24, 32, NULL, NULL },
{ 24, 64, NULL, NULL },
{ 128, 128, NULL, NULL },
{ 500, 128, NULL, NULL }
};
#define TN array_length (tcache_allocs)
static TestCase large_allocs[] = {
{ 23450, 64, NULL, NULL },
{ 23450, 64, NULL, NULL },
{ 23550, 64, NULL, NULL },
{ 23550, 64, NULL, NULL },
{ 23650, 64, NULL, NULL },
{ 23650, 64, NULL, NULL },
{ 33650, 64, NULL, NULL },
{ 33650, 64, NULL, NULL }
};
#define LN array_length (large_allocs)
void *p;
/* Sanity checks, ancillary to the actual test. */
#define CHECK(p,a) \
if (p == NULL || !PTR_IS_ALIGNED (p, a)) \
FAIL_EXIT1 ("NULL or misaligned memory detected.\n");
static int
do_test (void)
{
int i, j;
int count;
void *ptr[10];
void *p;
/* TCache test. */
for (i = 0; i < TN; ++ i)
{
size_t sz2;
tcache_allocs[i].ptr1 = memalign (tcache_allocs[i].alignment, tcache_allocs[i].size);
CHECK (tcache_allocs[i].ptr1, tcache_allocs[i].alignment);
sz2 = malloc_usable_size (tcache_allocs[i].ptr1);
free (tcache_allocs[i].ptr1);
/* This should return the same chunk as was just free'd. */
tcache_allocs[i].ptr2 = memalign (tcache_allocs[i].alignment, sz2);
CHECK (tcache_allocs[i].ptr2, tcache_allocs[i].alignment);
free (tcache_allocs[i].ptr2);
TEST_VERIFY (tcache_allocs[i].ptr1 == tcache_allocs[i].ptr2);
}
/* Test for non-head tcache hits. This exercises the memalign
scanning code to find matching allocations. */
for (i = 0; i < array_length (ptr); ++ i)
{
if (i == 4)
{
ptr[i] = memalign (64, 256);
CHECK (ptr[i], 64);
}
else
{
ptr[i] = malloc (256);
CHECK (ptr[i], 4);
}
}
for (i = 0; i < array_length (ptr); ++ i)
free (ptr[i]);
p = memalign (64, 256);
CHECK (p, 64);
count = 0;
for (i = 0; i < 10; ++ i)
if (ptr[i] == p)
++ count;
free (p);
TEST_VERIFY (count > 0);
/* Large bins test. This verifies that the over-allocated parts
that memalign releases for future allocations can be reused by
memalign itself at least in some cases. */
for (i = 0; i < LN; ++ i)
{
large_allocs[i].ptr1 = memalign (large_allocs[i].alignment, large_allocs[i].size);
CHECK (large_allocs[i].ptr1, large_allocs[i].alignment);
/* Keep chunks from combining by fragmenting the heap. */
p = malloc (512);
CHECK (p, 4);
}
for (i = 0; i < LN; ++ i)
free (large_allocs[i].ptr1);
/* Force the unsorted bins to be scanned and moved to small/large
bins. */
p = malloc (60000);
for (i = 0; i < LN; ++ i)
{
large_allocs[i].ptr2 = memalign (large_allocs[i].alignment, large_allocs[i].size);
CHECK (large_allocs[i].ptr2, large_allocs[i].alignment);
}
count = 0;
for (i = 0; i < LN; ++ i)
{
int ok = 0;
for (j = 0; j < LN; ++ j)
if (large_allocs[i].ptr1 == large_allocs[j].ptr2)
ok = 1;
if (ok == 1)
count ++;
}
/* The allocation algorithm is complicated outside of the memalign
logic, so just make sure it's working for most of the
allocations. This avoids possible boundary conditions with
empty/full heaps. */
TEST_VERIFY (count > LN / 2);
return 0;
}
#include <support/test-driver.c>
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