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] memory allocation + pointers

  • Subject: [Frama-c-discuss] memory allocation + pointers
  • From: maria.christofis at gmail.com (Maria Christofi)
  • Date: Fri, 8 Aug 2014 12:48:17 +0200
Good morning,

I have a problem with the code below.
I want to prove the two postconditions with the Jessie plugin, but it
doesn't seem possible..
I think that what's missing is something saying that only a[0] changes in
the first instruction and only a[1] in the second one (every a[i] except
the one concerned stays unchanged).

Am I right? Is it possible?

Have an nice evening!
Maria


=============================================================
int *d, *b;

/*@ requires \valid(a) &&
@ \valid(b) &&
  @     \base_addr(a) != \base_addr(b);
  @ assigns *a;
  @ ensures a[0] == (\at(a[0],Pre)+\at(b[3],Pre));
  @ ensures a[1] == (\at(a[1],Pre)+\at(b[\at(a[4],Pre)],Pre));
 */

void test (int *a, int i)
{
a[0] ^= b[3]

a[1] ^= b[a[4]];
}

-- 
Maria Christofi
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.gforge.inria.fr/pipermail/frama-c-discuss/attachments/20140808/5fe1dd9e/attachment.html>