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[Frama-c-discuss] Jessie question

  • Subject: [Frama-c-discuss] Jessie question
  • From: jsp at di.uminho.pt (Jorge Sousa Pinto)
  • Date: Wed, 28 Apr 2010 00:01:35 +0100
Hi, consider the program

/*@ requires \valid(c);
   @ ensures *c == 10 && y == 20;
   @*/
void q(int *c)
{
  y = 20;
  *c = 10;
}

The program is proved correct with my installation of Frama-C, but now  
suppose the precondition is strengthened as follows

/*@ requires \valid(c) && c==&y;
   @ ensures *c == 10 && y == 20;
   @*/
void q(int *c)
{
  y = 20;
  *c = 10;
}

Now the postcondition cannot be discharged, as expected. But doesn't  
this mean that the first program should not be considered correct?

Thanks, best regards
Jorge Sousa Pinto