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[Frama-c-discuss] Automating proof on data invariant with Wp

  • Subject: [Frama-c-discuss] Automating proof on data invariant with Wp
  • From: josselin.giet at ens.fr (Josselin Giet)
  • Date: Tue, 7 Jul 2020 15:52:51 +1000
  • In-reply-to: <c2049702-778a-9b2e-6fa7-c1f5aede092e@ens.fr>
  • References: <c2049702-778a-9b2e-6fa7-c1f5aede092e@ens.fr>
Hello,

I'm currently working on a project to verify invariant on data-types 
with relaxed concurrency models: reading are made out of critical 
regions, it's up to the writing thread to maintain the invariant each 
time a data is available to others.

I'm aware there is a way to declare weak and strong invariant, but I 
want to check them at specific instructions.
My typical example is the follow :

```C
struct point {
   int x, y;
};
\\@ on_visible (this.x > this.y);

int main(){
   struct point *pt = malloc(...);
   ...
   //@ make_visible pt;      <- invariant should hold at this point!
   ...
}
```

With the `register_global` function we have a `lexpr_node` that 
represents the invariant. I want to avoid an «ad hoc» translator since 
it may not be generic.
How can we translate it to an assertion that could be checked with Wp?

Best regards,

--
Josselin Giet
M2 DI/ENS