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[Frama-c-discuss] differences between Store model and Typed model

  • Subject: [Frama-c-discuss] differences between Store model and Typed model
  • From: loic.correnson at cea.fr (Loïc Correnson)
  • Date: Wed, 21 Nov 2012 09:23:19 +0100
  • In-reply-to: <569C6D7D26484241A530B87F45ADE1F80CA5BBC5@AOFRWMBXRSC004.resources.atosorigin.local>
  • References: <569C6D7D26484241A530B87F45ADE1F80CA5BBC5@AOFRWMBXRSC004.resources.atosorigin.local>
Hi Stephane,

This is completely right : the Store and Typed models have the same limitations.
Although, the Typed model is now (svn version) equipped with options to bypass those limitations, most of the time at the price of some **unverified** extra conditions that must be checked by hand.
These options will be documented in a future public release.

At this time, Runtime is the only model capable of handling memcpy. But this model is not maintained for a while and is about to be deprecated.
We planned to develop a new version of Runtime based on the framework than Typed, but I can not promise a date for its availability.

L.

Le 20 nov. 2012 ? 21:39, DUPRAT Stephane a ?crit :

> Hello,
>  
> The new memory model Typed of Frama-C/wp Oxygen is very interesting to improve efficiency of proof.
>  
> In the store model, it is clearly said that it is not able to process cast of pointeur type (in ?1.4 A consequence is that heterogeneous cast of pointers can not be translated in this model. For instance within this memory model, you can not cast a pointer to int into a pointer to char, and then access the internal representation of an int value in memory.).
> I think, that for the same reason, we cannot handle memcpy.
>  
> And the Typed model is said to have quite the same expressivity than Store.
> I?d like to have confirmation that Typed has the same limitation than Store for that point.
>  
> So, if it is the case, only Runtime model is able to process memcpy ?
>  
> Thanks in advance,
>  
> Stephane
>  
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