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[Frama-c-discuss] Frama C path sensitiveness

  • Subject: [Frama-c-discuss] Frama C path sensitiveness
  • From: m.vijay at nus.edu.sg (Vijayaraghavan Murali)
  • Date: Mon, 23 May 2011 11:00:43 +0800
Hi,

I'm just wondering if Frama C's analyses are path-sensitive or not. 
Consider the following program:

extern int n1,n2;
int main() {
      int a = 0, b;

      if(n1 < n2) { a = 4; }
      else if(n1 < n2) { a = 5; }

      b = a+1;
      return b;
}

Clearly the 2nd branch is infeasible, so a = 5 is essentially dead code. 
But the domain of 'a' is reported to be {0, 4, 5} and use-def analysis 
on the assignment to 'b' returns {a = 0; a = 4; a = 5;}. From this it 
looks like Frama C is not path-sensitive. Can someone explain?

Thank you!

------
Vijayaraghavan Murali
http://www.comp.nus.edu.sg/~mvijayar