libmudflap/testsuite/libmudflap.c/pass23-frag.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 int main ()
   5 {
   6 struct foo {
   7   int part1: 8;
   8   int nothing : 1;
   9   int part2 : 5;
  10   int lots_more_nothing : 3;
  11   int some_padding; /* for 64-bit hosts */
  12   float some_more_nothing;
  13   double yet_more_nothing;
  14 };
  15
  16 #define offsetof(TYPE, MEMBER)  ((size_t) &((TYPE *) 0)->MEMBER)
  17
  18 struct foo* q = (struct foo *) malloc (offsetof (struct foo, some_more_nothing));
  19 q->nothing = 1; /* touch q */
  20 /* The RHS of the following expression is meant to trigger a
  21    fold-const.c mapping the expression to a BIT_FIELD_REF.  It glues
  22    together the accesses to the two non-neighbouring bitfields into a
  23    single bigger boolean test. */
  24 q->lots_more_nothing = (q->part1 == 13 && q->part2 == 7);
  25 free (q);
  26
  27
  28 return 0;
  29 }