glibc/malloc/tst-aligned_alloc-lib.c

/* Module used for improved aligned_alloc testing.
   Copyright (C) 2024 Free Software Foundation, Inc.
   Copyright The GNU Toolchain Authors.
   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; see the file COPYING.LIB.  If
   not, see <https://www.gnu.org/licenses/>.  */

#include <array_length.h>
#include <libc-symbols.h>
#include <stdlib.h>

extern void *__libc_malloc (size_t size);
extern void *__libc_calloc (size_t n, size_t size);

int aligned_alloc_count = 0;
int libc_malloc_count = 0;
int libc_calloc_count = 0;

/* Get a random alignment value.  Biased towards the smaller values.  Must be
   a power of 2. */
static size_t get_random_alignment (void)
{
  size_t aligns[] = {
    1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384
  };

  return aligns[random () % array_length (aligns)];
}

static void *get_random_alloc (size_t size)
{
  void *retval;
  size_t align;

  switch (random() % 3)
  {
    case 1:
      align = get_random_alignment ();
      retval = aligned_alloc (align, size);
      aligned_alloc_count++;
      break;
    case 2:
      retval = __libc_calloc (1, size);
      libc_calloc_count++;
      break;
    default:
      retval = __libc_malloc (size);
      libc_malloc_count++;
      break;
  }

  return retval;
}


void * __random_malloc (size_t size)
{
  return get_random_alloc (size);
}
strong_alias (__random_malloc, malloc)