malloc/tst-obstack.c

   1 /* Test case by Alexandre Duret-Lutz <duret_g@epita.fr>.  */
   2 #include <obstack.h>
   3 #include <stdint.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6
   7 #define obstack_chunk_alloc verbose_malloc
   8 #define obstack_chunk_free verbose_free
   9 #define ALIGN_BOUNDARY 64
  10 #define ALIGN_MASK (ALIGN_BOUNDARY - 1)
  11 #define OBJECT_SIZE 1000
  12
  13 static void *
  14 verbose_malloc (size_t size)
  15 {
  16   void *buf = malloc (size);
  17   printf ("malloc (%zu) => %p\n", size, buf);
  18   return buf;
  19 }
  20
  21 static void
  22 verbose_free (void *buf)
  23 {
  24   free (buf);
  25   printf ("free (%p)\n", buf);
  26 }
  27
  28 int
  29 main (void)
  30 {
  31   int result = 0;
  32   int align = 2;
  33
  34   while (align <= 64)
  35     {
  36       struct obstack obs;
  37       int i;
  38       int align_mask = align - 1;
  39
  40       printf ("\n Alignment mask: %d\n", align_mask);
  41
  42       obstack_init (&obs);
  43       obstack_alignment_mask (&obs) = align_mask;
  44       /* finish an empty object to take alignment into account */
  45       obstack_finish (&obs);
  46
  47       /* let's allocate some objects and print their addresses */
  48       for (i = 15; i > 0; --i)
  49         {
  50           void *obj = obstack_alloc (&obs, OBJECT_SIZE);
  51
  52           printf ("obstack_alloc (%u) => %p \t%s\n", OBJECT_SIZE, obj,
  53                   ((uintptr_t) obj & align_mask) ? "(not aligned)" : "");
  54           result |= ((uintptr_t) obj & align_mask) != 0;
  55         }
  56
  57       /* clean up */
  58       obstack_free (&obs, 0);
  59
  60       align <<= 1;
  61     }
  62
  63   return result;
  64 }