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[Frama-c-discuss] value analysis and annotated post-conditions

  • Subject: [Frama-c-discuss] value analysis and annotated post-conditions
  • From: zepeem at gmail.com (Timothy E. Wang)
  • Date: Thu, 28 Jul 2016 15:13:11 -0400
Dear all,

A quick question. I am trying to get Value to take into account the
post-conditions that are part of the specifications of a library function.
I have a simple example below.  The output of the _sin function is
guaranteed to be within the interval [-1,1] but for some reason Value is
still returning [-MAX_FLOAT, MAX_FLOAT] for the variable y in the main
function. Any clue why this is happening?

Best,

Tim

#include "__fc_builtin.h"

/*@ requires \is_finite(x);
  @ assigns \result \from x;
  @ ensures \result>=-1.0 && \result <=1.0;
*/
double _sin(double x);

int main() {
double x=Frama_C_float_interval(-1.57,1.57);
double y=0.0;
y=_sin(x);
x=y;
return 1;
}

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