compat/test/heap.c

   1 /*****************************************************************************
   2  * aligned_alloc test case
   3  *****************************************************************************
   4  * Copyright © 2019 Rémi Denis-Courmont
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #include "config.h"
  22 #undef NDEBUG
  23 #include <assert.h>
  24 #include <stdalign.h>
  25 #include <stddef.h>
  26 #include <stdint.h>
  27 #include <stdlib.h>
  28 #include <errno.h>
  29
  30 struct big_align_struct {
  31     long long ll;
  32     double d;
  33 };
  34
  35 /* Supported alignments. Others are undefined (ISO C11 §7.22.3, §J.2). */
  36 static const size_t alignv[] = {
  37     alignof (char),
  38     alignof (short),
  39     alignof (int),
  40     alignof (long),
  41     alignof (long long),
  42     alignof (float),
  43     alignof (double),
  44     alignof (struct big_align_struct),
  45     alignof (void *),
  46     alignof (max_align_t),
  47 };
  48
  49 static const size_t alignc = sizeof (alignv) / sizeof (alignv[0]);
  50
  51 static void test_posix_memalign(size_t align, size_t size)
  52 {
  53     void *p;
  54     int val = posix_memalign(&p, align, size);
  55
  56     if (align >= sizeof (void *)) {
  57         if (val == 0) {
  58             assert(((uintptr_t)p & (align - 1)) == 0);
  59             free(p);
  60         }
  61     } else
  62         assert(val != 0);
  63 }
  64
  65 int main(void)
  66 {
  67     void *p;
  68
  69     /* aligned_alloc() */
  70
  71     for (size_t i = 0; i < alignc; i++) {
  72         size_t align = alignv[i];
  73
  74         assert((align & (align - 1)) == 0); /* must be a power of two */
  75
  76         p = aligned_alloc(alignv[i], 0);
  77         free(p); /* must free {aligned_,c,m,c,re}alloc() allocations */
  78
  79         for (size_t j = 0; j < alignc; j++) {
  80              size_t size = alignv[j];
  81
  82              if (size < align)
  83                  continue; /* size must be a multiple of alignment */
  84
  85              p = aligned_alloc(align, size);
  86              assert(p != NULL); /* small non-zero bytes allocation */
  87              assert(((uintptr_t)p & (align - 1)) == 0);
  88              free(p);
  89         }
  90     }
  91
  92     /* posix_memalign() */
  93
  94     for (size_t i = 0; i < 21; i++) {
  95         size_t align = (size_t)1 << i;
  96
  97         test_posix_memalign(align, 0);
  98         test_posix_memalign(align, 1);
  99         test_posix_memalign(align, align - 1);
 100         test_posix_memalign(align, align);
 101         test_posix_memalign(align, align * 2);
 102     }
 103
 104     return 0;
 105 }