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# [Frama-c-discuss] introducing hypothesis with ACSL on sets of array elements witk Frama-C/Value

• Subject: [Frama-c-discuss] introducing hypothesis with ACSL on sets of array elements witk Frama-C/Value
• From: stephane.duprat at atos.net (DUPRAT Stephane)
• Date: Tue, 16 Jul 2013 20:20:15 +0000

```Hello all,

I took a little time to play with the possibilities of value in evaluating ACSL.

Here it is a piece of code:
int tab1[10];
int tab2[10];
/*@
requires tab1[2]==2;
requires tab2[2..3]==23;
*/
int f1(void)
{
tab1[5]=5;
tab2[6]=67;
tab2[7]=67;
//@ assert a1: tab1[2]==2;
//@ assert a2: tab1[5]==5;
//@ assert a3: tab2[2..3]==23;
//@ assert a4: tab2[6..7]==67;
return;
}

When I run Frama-C/Value on this little example, the assert a3 is the only one that is not verified.
I deduce that :

-          The tool is able to evaluate a simple element (tab1[5]==5)

-          An hypothesis introduces by ACSL on a simple element (tab1[2]==2) is propagated in the program

-          The tool is able to evaluate a set of elements (tab2[6..7]==67)

-          An hypothesis introduces by ACSL on a set of elements (tab2[2..3]==23) is not propagated in the program

The question is for the last item, if there is a way to introduce hypothesys on sets of elements ?

Stephane

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