Re: [SystemSafety] Modelling and coding guidelines: software components

From: André Passos < >
Date: Thu, 17 Mar 2016 11:49:19 +0100


Hi Michael,

In the context of IEC 61508 I don't know but there is a nice article in DO-178C context (
http://www.open-do.org/wp-content/uploads/2013/04/IEEE_Software_Formal_Or_Testing.pdf ).

Regards, Andre.

2016-03-17 11:11 GMT+01:00 Michael J. Pont <M.Pont_at_xxxxxx

> Jose,
>
>
>
> I have sympathy with the goal here (use of “task contracts” – with checks
> of pre- and post-conditions - are A Good Thing, in my experience).
>
>
>
> Do you know how much use has been made of Frama-C in IEC 61508 (or
> similar) projects?
>
> All the best,
>
>
>
> Michael.
>
>
>
> Michael J. Pont
>
> SafeTTy Systems Ltd.
>
>
>
> *From:* systemsafety [mailto:
> systemsafety-bounces_at_xxxxxx > Faria
> *Sent:* 17 March 2016 09:48
> *To:* GRAZEBROOK, Alvery N <alvery.grazebrook_at_xxxxxx > *Cc:* systemsafety_at_xxxxxx > *Subject:* Re: [SystemSafety] Modelling and coding guidelines: software
> components
>
>
>
> Alvery,
>
> >Does anyone know of similar annotation schemes on language subsets of C,
> C++ or other more widely used languages?
>
> For C, I'd highlight ACSL, which is supported in the Frama-C platform,
> http://frama-c.com/acsl.html
>
> For C#, there's Spec#, from Microsft,
> http://research.microsoft.com/en-us/projects/specsharp/
>
> For Java, JML,
> http://research.microsoft.com/en-us/um/people/leino/papers/jml-sttt.pdf
>
> Best,
>
> José
>
>
>
>
>
> On Thu, Mar 17, 2016 at 9:22 AM, GRAZEBROOK, Alvery N <
> alvery.grazebrook_at_xxxxxx >
> On the principle of nudging folk in the right direction, it seems to me
> that the use of non-executable annotations (e.g. SPARK) is a valuable
> contribution for defining a library interface contract that would make
> software component re-use more checkable.
>
> Does anyone know of similar annotation schemes on language subsets of C,
> C++ or other more widely used languages? If this concept were to become
> more widely available, it could have a big impact on the expectations for
> "good quality" software components and be used in areas where regulations
> don't reach.
>
> Cheers,
> Alvery
>
> [snip]
> > Whether we like it or not we are all
> >involved in component based design. My experience with software
> >libraries is that there are some good ones out there that are quite
> >stable. On the negative side I have two problems with them:
> >1. They are almost universally very poorly documented so you can waste
> >a day trying to achieve a trivial outcome.
>
> I agree that many examples of software components I have seen have lacked
> sufficient documentation to be able to make sensible decisions about
> suitability. I find that if you can chuck it back via the author to get
> that improved, the documentation improvement is sometimes worthwhile.
> Otherwise you end up writing it yourself.
>
> >2. The authors seem to have no concept of backward compatibility.
> >If you make the mistake of upgrading to the latest version you can
> >trash your complete application: data structure changes, even method
> >name changes. Amazing!#
>
> Regression testing is part of the regimen and any new version has to pass
> all the old tests as well as any new ones. There is a strict notion of how
> much impact changes at lower levels will have on the upper layers of the
> application. I'll happily explain about surfaces to you at some stage.
> [snip]
>
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>
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-- 
Cumprimentos, André Passos.



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