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[Frama-c-discuss] memset and non-chars

  • Subject: [Frama-c-discuss] memset and non-chars
  • From: kurt at roeckx.be (Kurt Roeckx)
  • Date: Fri, 4 Sep 2015 19:18:03 +0200
Hi,

I'm trying to use wp with alt-ergo and I'm having problems with
memsets for everything that involves more than chars.  I'm not
sure if this is just with memset or a more general problem, it's
just the first thing I notice.

For instance the following things can be checked:
char a[2]; memset(a, 0, sizeof(a));
struct b { char c[2]; } d; memset(&d, 0, sizeof(d));

But if you change the char to int, it can no longer say it's
valid.

In the case with chars, it says it's valid for all values n that
are equal or smaller to the size.  For the case with ints only the
value 0 seems to be valid.

If I instead try to use coq I can get the "char a[2]" working, but
not the struct.

PS: Using char a; memset(&a, 0, sizeof(a)); gives me an assertion
failure.  I seem to ge very good in getting assertion failures.


Kurt