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[Frama-c-discuss] Can i specify/proove a function to be "just called"?

Hello,

I think one way to achieve that would be to write a definition for
function foo in ghost code. This definition could update a counter, or
register its argument, in a global ghost variable; then you can use ACSL
for stating statements on this ghost variable.

Best regards,
Matthieu

ds.verification at flecsim.com writes:

> Hello everybody,
>
> i have browsed the ACSL reference manual in search for a predicate or other
> gear to express and prove whether some function is called by some other
> function.
> So, the idea is that for the function being called that its call has no
> (visible-to-Frama-C) effect but i only need to ensure it is called: The
> function is "trustable" and has side effects which are out of scope of the
> verification.
>
> I thought of something like:
>
> /* Does some magic (e.g. external assembly module), but has no contract
>  * its own
>  */
> extern void foo(int val);
>
> int counter = 0;
>
> /* @ensures \called(foo(\old(counter)));
>    @ensures \counter=\old(counter)+1;
>  */
> void test1()
> {
>     foo(counter);
>     counter++;
> }
>
> Is this possible in ACSL?
>
> Thanks in advance
>
> 	Daniel
>
>
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