On Thu, 26 Jun 2014, Joe Perches wrote:
> On Fri, 2014-06-27 at 07:29 +0200, Julia Lawall wrote:
> > On Thu, 26 Jun 2014, Joe Perches wrote:
> > > The cast of a const void * to a void * was odd.
> > >
> > > Maybe a mechanism to verify appropriateness of
> > > loss of constness for any pointer might be useful.
> >
> > I tried the following, but didn't find anything interesting:
> >
> > @disable drop_cast@
> > type T;
> > const T e;
> > @@
> >
> > * (T)e
>
> What code does this match?
> Do you have an example match?
>
> This doesn't find a cast of a void type like:
>
> void func(const void * const p)
> {
> char *p2 = p;
>
> p2[0] = 1;
> }
Is this a real example? Because gcc complains about this sort of problem.
I made a semantic patch that detects this, but since gcc does the same
thing, it doesn't seem very interesting. Coccinelle gives a few false
positives due to lack of type information.
julia
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