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[Frama-c-discuss] Value Analysis and user-defined predicates

  • Subject: [Frama-c-discuss] Value Analysis and user-defined predicates
  • From: sylvain.nahas at googlemail.com (sylvain nahas)
  • Date: Tue, 10 Apr 2012 15:04:30 +0200
Dear list,

I am getting unexpected results with the value analysis plug-in, in
which basically boils down to the following code snippet:


/*@ predicate greater_than_zero(integer myval) = myval > 0; */
...
int a;
a =  10;
/*@ assert a > 0; */
/*@ assert greater_than_zero(a); */
...


I would expect the status "valid" for all "assert" above, but the
value analysis obstinately considers the second one as "unknown".

Could somebody by kind enough to point me at what I am doing wrong there?
Thanks in advance,
Sylvain