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[Frama-c-discuss] strlen axioms and memory space

  • Subject: [Frama-c-discuss] strlen axioms and memory space
  • From: yrashk at gmail.com (Yurii Rashkovskii)
  • Date: Thu, 30 Jul 2020 13:36:38 -0700
Hi,

I have a question / thought to bounce off. I've been recently trying to
prove a few properties on some trivial functions in a small project of mine
(https://github.com/yrashk/clam).

I ran into an interesting aspect where I needed to do extensive checks on
certain counters not hitting UINTPTR_MAX. I have managed to simplify that
with a rather trivial axiom:

https://github.com/yrashk/clam/commit/e84af3bf8d72ebdcec392589e189952d560ba28a

(obviously, I would have preferred an actual prove, but I am but a novice)

I am wondering if any thought has been previously given on such cases
where, for example `strlen` axioms are bound by \forall ℤ which is
admittedly wider than pointers would allow?

Is my approach anywhere close to reasonable? Should Frama-C axiomatics
include more consideration for the [limited] pointer integer universe?

I apologize if this is something obvious I haven't figured out yet :)

Thanks!

-- 
Y.
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