gcc/testsuite/gcc.dg/pr55430.c

   1 /* PR middle-end/55430 */
   2 /* { dg-do run { target mmap } } */
   3 /* { dg-options "-O2" } */
   4
   5 #include <stddef.h>
   6 #include <stdio.h>
   7 #include <sys/mman.h>
   8 #ifndef MAP_ANONYMOUS
   9 #define MAP_ANONYMOUS MAP_ANON
  10 #endif
  11 #ifndef MAP_ANON
  12 #define MAP_ANON 0
  13 #endif
  14 #ifndef MAP_FAILED
  15 #define MAP_FAILED ((void *)-1)
  16 #endif
  17 #include <stdlib.h>
  18
  19 struct S
  20 {
  21   unsigned int s1 : 8;
  22   unsigned int s2 : 2;
  23 };
  24
  25 __attribute__((noinline, noclone)) int
  26 foo (int x, int y, struct S *z, unsigned int w)
  27 {
  28   if (z[y].s2 == x && z[y].s1 == w)
  29     return 1;
  30   return 0;
  31 }
  32
  33 int
  34 main ()
  35 {
  36   char *p = mmap (NULL, 131072, PROT_READ | PROT_WRITE,
  37                   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  38   if (p == MAP_FAILED)
  39     return 0;
  40   if (munmap (p + 65536, 65536) < 0)
  41     return 0;
  42   if ((65536 / sizeof (struct S)) * sizeof (struct S) != 65536)
  43     return 0;
  44   struct S *s = (struct S *) (p + 65536);
  45   return foo (0, 0, s - 1, 0) != 1;
  46 }