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[Frama-c-discuss] Porting some simple example from Jessie to WP

  • Subject: [Frama-c-discuss] Porting some simple example from Jessie to WP
  • From: jnarboux at narboux.fr (Julien Narboux)
  • Date: Mon, 21 Sep 2015 09:49:38 +0200
Hi,

For teaching, I am trying to port some examples I have to WP, the following
example could be proved by jessie, but it doesn't work with WP.

Can I have a hint ?

/*@
requires \valid(x)&&-10<*x<10;
requires \valid(y)&&-10<*y<10;
assigns *x;
assigns *y;
ensures *x == \old(*y);
ensures *y == \old(*x);
*/

void echange(int *x, int *y)

{
  *x=*x+*y;
  *y=*x-*y;
  *x=*x-*y;
  return;
}

Regards,

Julien Narboux
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