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

On Thu, Jul 28, 2016 at 4:05 PM, Pascal Cuoq <pascal.cuoq at gmail.com> wrote:

> 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);
>

Thanks Pascal!


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