--- layout: fc_discuss_archives title: Message 27 from Frama-C-discuss on November 2009 ---
Hi, If you want to learn the Jessie plugin, please use the jessie tutorial instead : http://frama-c.cea.fr/jessie_tutorial_index.html The example max_seq given in ACSL tutorial is not annotated properly to be proved. About provers to install on Linux: see the prover tips page of the Why tool. - Claude Aaron Rocha wrote: > Hi everybody, > > I am new to Frama-C and to the world of assisted mathematical proofs. Basically, I am a C developer who is interesting in writing code that can be verified. I ran across Frama-C and it looks like just the type of thing I was looking for. I am having a little bit of a hard time getting started though. > > I am on Linux and it looks like only a selected number of proof assistants are available on this platform. It sounds to me as though Coq would be the best one. The problem is that, if I use Coq, I have to actually fill the proof in (after make -f <source file>.makefile coq) and I am not familiar with Coq yet. So I am using Alt-Ergo instead. > > But Alt-Ergo fails to prove the preservation of loop invariants in this code from the tutorial: > > /*@ requires n > 0; > requires \valid(p+ (0..n-1)); > assigns \nothing; > ensures \forall int i; 0 <= i <= n-1 ==> \result >= p[i]; > ensures \exists int e; 0 <= e <= n-1 && \result == p[e]; > */ > int max_seq(int* p, int n) { > > int res = *p; > int i = 0; > > //@ ghost int e = 0; > /*@ loop invariant \forall integer j; 0 <= j <= i ==> res >= *(p+j); > loop invariant \valid(p+e) && p[e] == res; > */ > for(i = 0; i < n; i++) { > if (res < *p) { > res = *p; > //@ ghost e = i; > } > p++; > } > return res; > } > > Do you run frama-c on Linux? If so, what proof assistants are you using? If Coq is the way to go, is there some sort of gentle introduction on how to use Coq with Frama-c? > > Thanks in advance > > > __________________________________________________________________ > Yahoo! Canada Toolbar: Search from anywhere on the web, and bookmark your favourite sites. Download it now > http://ca.toolbar.yahoo.com. > > _______________________________________________ > Frama-c-discuss mailing list > Frama-c-discuss at lists.gforge.inria.fr > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/frama-c-discuss > -- Claude March? | tel: +33 1 72 92 59 69 INRIA Saclay - ?le-de-France | mobile: +33 6 33 14 57 93 Parc Orsay Universit? | fax: +33 1 74 85 42 29 4, rue Jacques Monod - B?timent N | http://www.lri.fr/~marche/ F-91893 ORSAY Cedex |