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[Frama-c-discuss] Using Frama-C as Caduceus

??????? ?????? wrote:
> Wow, thanks! It really seems to work. But I'm not sure I got the idea 
> in its entirety. Do you mean that Jessie restricts "a" and "b" to be 
> in the same block just when it comes across any order relation between 
> these pointers? So, for example, if I want these pointers to be in the 
> same block, but don't want to specify any restriction (so that 
> pointers can overlap and all that), I'll just need to write something 
> like "requires (a == b) || (a < b) || (a > b)", right?
>
Indeed yes. Or simpler : (a == b) && (a != b)

Sure it is not nice, but it is only a work-around.

Generally speaking, I am interested in any similar example of that need, 
a part from the swap function which seems to be the only example so far...

- Claude
> - Dmitry
>
> 2009/11/24 Claude Marche <Claude.Marche at inria.fr 
> <mailto:Claude.Marche at inria.fr>>
>
>
>     The reason is that swap is first interpreted as if a and b were in
>     different block, whereas you call it on pointers to the same block.
>     A work around is to add a precondition that restrict a and b to be in
>     the same block, and anyway you need something to specify that they do
>     not overlap, e.g
>
>     requires (a==b) || (a + size <= b) || (b + size <= a);
>
>
>     - Claude
>
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