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[Frama-c-discuss] Issue to express assigns on arrays

  • Subject: [Frama-c-discuss] Issue to express assigns on arrays
  • From: dmentre at linux-france.org (David MENTRE)
  • Date: Thu, 26 Mar 2009 12:21:20 +0100
Hello,

I have following code:
------
#include <string.h>

#define MAX 12

int a[MAX];
char *c[MAX];

/*@ assigns a[..];
 */
void assign_int(void)
{
  int i;

  //@ loop invariant 0 <= i && i <= MAX;
  for (i = 0; i < MAX; i++) {
    a[i] = 0x45;
  }
}

/*@ assigns c[..];
 */
void assign_char(void)
{
  int i;

  //@ loop invariant 0 <= i && i <= MAX;
  for (i = 0; i < MAX; i++) {
    c[i] = strndup("something", MAX);
  }
}

/*@ assigns a[..];
    assigns c[..];
 */
void main(void)
{
  assign_int();
  assign_char();
}
------

On this code, I cannot prove properties "assigns a[..];" for
assign_int() and "assigns c[..];" for assign_char(). However the
assignation seems obvious to me.

I have tried "assigns a[0..11];" without success.

Could somebody explain to me what I have overlooked?

Yours,
david