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] Approach to compute if-else in Wp and Why

On 10/11/2012 04:15 PM, Boris Hollas wrote:
> Hello,
>
> what approach do Wp or Why use to avoid the exponential growth of the
> VCs due to the computation of the selection (branching) rule? Do you use
> "passification" as proposed by Leino? Any references?

In Why, it depends which version you are using for VC generation. The 
page http://krakatoa.lri.fr/ summarizes which version of Why (2 or 3) is 
used in Frama-C by default, and if the other version is available on option.

With Why2, you can pass the option --fast-wp to use a worst-case 
quadratic, linear in practice, weakest precondition similar to the one 
by Leino.

With Why3, you do not have this option right now, but Jean-Christophe 
Filli?tre has started implementing it, and Johannes Kanig and I have 
agreed to contribute to this implementation. So coming in a few months.
-- 
Yannick Moy, Senior Software Engineer, AdaCore