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

  • Subject: [Frama-c-discuss] value analysis and annotated post-conditions
  • From: pascal.cuoq at gmail.com (Pascal Cuoq)
  • Date: Thu, 28 Jul 2016 22:05:22 +0200
  • In-reply-to: <CABtBz=UcgZH2o+gnb=KvKZOeeCSAHbKHuG6rH_94wmJwKtsr5Q@mail.gmail.com>
  • References: <CABtBz=UcgZH2o+gnb=KvKZOeeCSAHbKHuG6rH_94wmJwKtsr5Q@mail.gmail.com>
Hello,

On Thu, Jul 28, 2016 at 9:13 PM, Timothy E. Wang <zepeem at gmail.com> wrote:

> 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?
>
>
try this:

/*@ requires \is_finite(x);

  @ assigns \result \from x;

  @ ensures \is_finite(\result);

  @ ensures \result>=-1.0 && \result <=1.0;

*/

double _sin(double x);
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