libmudflap/testsuite/libmudflap.c/fail26-frag.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 int main ()
   5 {
   6 char *foo;
   7
   8 __mf_set_options ("-check-initialization");
   9 foo = (char *)malloc (1);
  10
  11 /* These two operations each expand to a read-modify-write.
  12  * Even though the end result is that every bit of foo[0] is
  13  * eventually written to deterministically, the first read
  14  * triggers an uninit error.  Ideally, it shouldn't, so this
  15  * should be treated more like a regular XFAIL.  */
  16 foo[0] &= 0xfe;
  17 foo[0] |= 0x01;
  18
  19 return foo[0];
  20 }
  21 /* { dg-output "mudflap violation 1.*" } */
  22 /* { dg-output "Nearby object.*" } */
  23 /* { dg-output "mudflap object.*malloc region.*1r/0w.*" } */
  24 /* { dg-do run { xfail *-*-* } } */