/* Test case by Alexandre Duret-Lutz <duret_g@epita.fr>. */ #include <obstack.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #define obstack_chunk_alloc verbose_malloc #define obstack_chunk_free verbose_free #define ALIGN_BOUNDARY 64 #define ALIGN_MASK (ALIGN_BOUNDARY - 1) #define OBJECT_SIZE 1000 static void * verbose_malloc (size_t size) { void *buf = malloc (size); printf ("malloc (%zu) => %p\n", size, buf); return buf; } static void verbose_free (void *buf) { free (buf); printf ("free (%p)\n", buf); } int main (void) { int result = 0; int align = 2; while (align <= 64) { struct obstack obs; int i; int align_mask = align - 1; printf ("\n Alignment mask: %d\n", align_mask); obstack_init (&obs); obstack_alignment_mask (&obs) = align_mask; /* finish an empty object to take alignment into account */ obstack_finish (&obs); /* let's allocate some objects and print their addresses */ for (i = 15; i > 0; --i) { void *obj = obstack_alloc (&obs, OBJECT_SIZE); printf ("obstack_alloc (%u) => %p \t%s\n", OBJECT_SIZE, obj, ((uintptr_t) obj & align_mask) ? "(not aligned)" : ""); result |= ((uintptr_t) obj & align_mask) != 0; } /* clean up */ obstack_free (&obs, 0); align <<= 1; } return result; }