[Cocci] Handling of omitted data type specification?

[julia.lawall@lip6.fr (Julia Lawall)]

On Mon, 8 Apr 2013, SF Markus Elfring wrote:

> > In the previous fix that I made, I just caused the missing type,
> > which was hidden under a macro, to make the match fail.
>
> How do you think about to make this detail configurable?

On this case, there is nothing to configure.  If there is no known type,
then matching a type variable cannot succeed.

> > In this case, though perhaps you would prefer T to be bound to int?
>
> Does the C programming language specify that integers are used as the default
> data type (or if modifiers are used)?
> http://stackoverflow.com/questions/2099830/unsigned-keyword-in-c#2099873
> https://www.cs50.net/resources/cppreference.com/data_types.html
> http://en.cppreference.com/w/cpp/language/types

Coccibelle already takes case of eg signed x;  It should do the same for
register, for consistency.

> > That might cause some problemes, though, because it is not a real "int"
> > in the source code...
>
> Does the semantic patch language support to filter for omitted data types?
>
> Would you like to distinguish the use case if this item was just forgotten or
> intentionally omitted?

Perhaps it is useful.  There may be an isomorphism for deciding whether or
not int is assumed in the signed etc case.

julia