Why3 is a platform for deductive program verification.

It provides a rich language for specification and programming, called WhyML, and relies on external theorem provers, both automated and interactive, to discharge verification conditions. Why3 comes with a standard library of logical theories (integer and real arithmetic, Boolean operations, sets and maps, etc.) and basic programming data structures (arrays, queues, hash tables, etc.). A user can write WhyML programs directly and get correct-by-construction OCaml programs through an automated extraction mechanism. WhyML is also used as an intermediate language for the verification of C, Java, or Ada programs.

Why3 is a complete reimplementation of the former Why platform. Among the new features are: numerous extensions to the input language, a new architecture for calling external provers, and a well-designed API, allowing to use Why3 as a software library. An important emphasis is put on modularity and genericity, giving the end user a possibility to easily reuse Why3 formalizations or to add support for a new external prover if wanted.

May 6, 2014

Published version 0.83

Jan 8, 2014

Published version 0.82

Apr 2, 2013

Published version 0.81

• Andrei Paskevich gained authorship.
• Claude Marché gained authorship.
• François Bobot gained authorship.
• Guillaume Melquiond gained authorship.
• Jean-Christophe Filliâtre gained authorship.
• Now licensed under GNU Lesser General Public License version 2.1.
• Francois.Bobot@cea.fr assumed maintainership from contact@ocamlpro.com.
• http://why3.lri.fr/ added as homepage.

Mar 22, 2013

Published version 0.80

Aug 21, 2012

Published version 0.73