Comment Feed for Channel 9 - Francesco Logozzo - Static Checking with Code Contracts for .NET http://ecn.channel9.msdn.com/o9/ch9/4/5/3/5/1/5/staticcheckercodecontracts_512_ch9.png Channel 9 - Francesco Logozzo - Static Checking with Code Contracts for .NET Francesco Logozzo, a researcher at the Research in Software Engineering (RiSE) group at Microsoft Research, gives a demo of the Static Checker that comes with Code Contracts for .NET tools. The static checker allows you to verify that all the assertions in your code hold without actually running the code!Francesco also goes to the whiteboard and gives us a short tutorial on Abstract Interpretation, the technique used by the static checker to prove the assertions. Try the Code Contracts in your web browser at http://pex4fun.com/absverified! Code Contracts ForumsCode Contracts Home pageThe Research in Software Engineering team (RiSE) coordinates Microsoft's research in Software Engineering in Redmond, USA. en Sun, 26 May 2013 07:33:51 GMT Sun, 26 May 2013 07:33:51 GMT Rev9 Re: Francesco Logozzo - Static Checking with Code Contracts for .NET Abstract interpretation and static checking is a real cool thing. Thanks for sharing this and keep pushing in further developments on this!

Cheers, Matthias

posted by minddriven.de

]]> http://channel9.msdn.com/Blogs/Peli/Static-Checking-with-Code-Contracts-for-NET#c633972462040000000 Thu, 24 Dec 2009 10:10:04 GMT http://channel9.msdn.com/Blogs/Peli/Static-Checking-with-Code-Contracts-for-NET#c633972462040000000 minddriven.de Re: Francesco Logozzo - Static Checking with Code Contracts for .NET Great video and "promo" Smiley I've just started using CC.

 

Thank you very much.

posted by macias

]]> http://channel9.msdn.com/Blogs/Peli/Static-Checking-with-Code-Contracts-for-NET#c633976857980000000 Tue, 29 Dec 2009 12:16:38 GMT http://channel9.msdn.com/Blogs/Peli/Static-Checking-with-Code-Contracts-for-NET#c633976857980000000 macias Re: Francesco Logozzo - Static Checking with Code Contracts for .NET Some remark, or maybe qestion about simple example on whiteboard... since we always entering that loop with x increment we should get postcondition of x > 0 strictly... why do all reasoning with intervals leads to x in [0, +inf] interval?

posted by Andrew Zonov

]]> http://channel9.msdn.com/Blogs/Peli/Static-Checking-with-Code-Contracts-for-NET#c633998873030000000 Sat, 23 Jan 2010 23:48:23 GMT http://channel9.msdn.com/Blogs/Peli/Static-Checking-with-Code-Contracts-for-NET#c633998873030000000 Andrew Zonov Re: Francesco Logozzo - Static Checking with Code Contracts for .NET Hi Andrew,

  that's a very good point.

 

(As far as x is concerned) the loop invariant is x >= 0, as before entering the loop  x == 0, and then it is always incremented by one.

 

At the loop exit, we know that x >=0, but also that x > N (by the negation of the loop guard) and N > 0 (by the method precondition).

As a consequence we can refine the interval for x to [2, +oo].

 

I haven't mentioned it in the video to keep it simple, but you are right that the tool can prove a stronger assertion after the loop. In fact, if you download the checker, you can see that it proves the assertions x > 0 and x > 1 (but not x > 2 Wink.

 

Thanks!

f 

posted by logozzo

]]> http://channel9.msdn.com/Blogs/Peli/Static-Checking-with-Code-Contracts-for-NET#c634003095310000000 Thu, 28 Jan 2010 21:05:31 GMT http://channel9.msdn.com/Blogs/Peli/Static-Checking-with-Code-Contracts-for-NET#c634003095310000000 logozzo