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[Frama-c-discuss] Predicate call not listed in jessie gui

  • Subject: [Frama-c-discuss] Predicate call not listed in jessie gui
  • From: Christoph.Weber at first.fraunhofer.de (Christoph Weber)
  • Date: Mon, 20 Apr 2009 10:11:20 +0200
Hello,

I would like to ask, whether the following is known and what needs to be done to fix my problem.

I have following swap-Function:

/*@
    predicate swapped {L1, L2}(int* a, int* b) =
        \at(*a, L1) == \at(*b, L2) &&
        \at(*b, L1) == \at(*a, L2);
*/
/*@
    requires \valid(a);
    requires \valid(b);
    assigns *a;
    assigns *b;

    ensures *a == \old(*b);
    ensures *b == \old(*a);
    ensures swapped{Here, Old}(a,b);
*/
void swap (int* a, int* b )
{
    int c = *a;
    *a = *b;
    *b = c;
}

When proving with jessie gui, I do not get any error but the predicate-call is neither listed nor does it seem to be proven.

Sincerely

Christoph
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