tests/test-alignalloc.c

   1 /* Test alignalloc and alignfree.
   2
   3    Copyright 2022-2024 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation, either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 #include <alignalloc.h>
  21
  22 #include <stdint.h>
  23 #include <string.h>
  24 #include "intprops.h"
  25
  26 #include "signature.h"
  27 SIGNATURE_CHECK (alignalloc, void *, (idx_t, idx_t));
  28 SIGNATURE_CHECK (alignfree, void, (void *));
  29
  30 #include "macros.h"
  31
  32 static void
  33 test_alignalloc (idx_t alignment, idx_t size)
  34 {
  35   void *p = alignalloc (alignment, size);
  36   if (p)
  37     {
  38       memset (p, 0, size);
  39       ASSERT ((uintptr_t) p % alignment == 0);
  40     }
  41   alignfree (p);
  42 }
  43
  44 int
  45 main ()
  46 {
  47   /* Check that alignalloc returns properly aligned storage when it succeeds.
  48      Stop at 16 MiB alignments because circa-2022 AddressSanitizer goes
  49      catatonic with large alignments in posix_memalign,
  50      and there seems to be little point to testing them.  */
  51   for (idx_t alignment = 1; alignment <= 16 * 1024 * 1024; alignment *= 2)
  52     for (idx_t size = 1; size <= 1024; size *= 2)
  53       {
  54         test_alignalloc (alignment, size - 1);
  55         test_alignalloc (alignment, size);
  56         test_alignalloc (alignment, size + 1);
  57       }
  58
  59   /* Check that alignfree is a no-op on null pointers.  */
  60   alignfree (NULL);
  61
  62   return test_exit_status;
  63 }