Frama-C-discuss mailing list archives

This page gathers the archives of the old Frama-C-discuss archives, that was hosted by Inria's gforge before its demise at the end of 2020. To search for mails newer than September 2020, please visit the page of the new mailing list on Renater.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Frama-c-discuss] Global initialization of variables not taken into account?

  • Subject: [Frama-c-discuss] Global initialization of variables not taken into account?
  • From: dmentre at linux-france.org (David MENTRE)
  • Date: Fri, 20 Mar 2009 15:04:44 +0100
Hello,

Suppose I have following code:
===
#define MAX 5
int c[5] = {0, };
int global = 0;

void main(void)
{
  //@ assert global == 0;
  //@ assert \forall integer i; 0 <= i < MAX ==> c[i] == 0;

  return;
}
===

The two assertions are not proven by Alt-Ergo (\?/ state[1]).

However, if I write the code like this:
===
#define MAX 5
int c[5];
int global;

void main(void)
{
  int i;

  /*@ loop invariant \forall integer j; 0 <= j < i ==> c[j] == 0;
      loop invariant 0 <= i && i <= MAX;
   */
  for (i = 0; i < MAX; i++)
    c[i] = 0;
  global = 0;

  //@ assert global == 0;
  //@ assert \forall integer i; 0 <= i < MAX ==> c[i] == 0;

  return;
}
===

My assertions are correctly proven. Am I forced to do all global
initializations manually or I have missed something? This is not a big
issue but is a bit cumbersome.

I'm calling Jessie like this:
  frama-c -jessie-analysis -jessie-atp alt-ergo -jessie-cpu-limit 2
-jessie-gui init-issue.c

Sincerely yours,
david

[1] What does that exactly mean? (cf.
http://lists.gforge.inria.fr/pipermail/frama-c-discuss/2009-March/000425.html)