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[Frama-c-discuss] ACSL by Example (version 21.1.0)

  • Subject: [Frama-c-discuss] ACSL by Example (version 21.1.0)
  • From: jens.gerlach at fokus.fraunhofer.de (Gerlach, Jens)
  • Date: Thu, 9 Jul 2020 17:45:53 +0000
Dear Frama-C users,

Fraunhofer FOKUS has just released a new version (21.1.0) of “ACSL by Example”.
This version is intended for Frama-C 21.1 (Scandium).
The examples can be accessed through Github

      https://github.com/fraunhoferfokus/acsl-by-example

The PDF document can be directly accessed through

      https://github.com/fraunhoferfokus/acsl-by-example/blob/master/ACSL-by-Example.pdf

One positive aspect of this release of Frama-C is that WP now provides a more precise presentation of C integer array.
A side effect of the additional information is, however,  that the proof obligations generated by WP become harder to prove.
More specifically, that means that we had to 

- review and improve a substantial amount of code annotations,
- modify existing Coq proofs,
- write new Coq proofs for lemmas that could not be automatically verified anymore.

We think, however, that our work led in many cases to clearer ACSL annotations.
Luckily for us, the Frama-C team was very supportive. 
We would particularly like to thank Allan Blanchard for his help!

Please refer to the changes section for a more detailed description.

We hope that this version helps you in learning and applying Frama-C/WP!

Jens Gerlach