Hi, On Wed, 2 Mar 2011, Kyle Girard wrote:
> > > Can I count on the uid for a type in a header to be the same across > > > all compilation units that use that header? > > > > ... no. > > > > Is there anyway in gcc to get a unique id for a type that would be the > same across compilation units? Such a unique id is impossible with bounded numbers (and TYPE_UID is only an int). There are more than 2^32 types. The best you can do is some hash value, and even then it depends on how you define type equality. In GCC we currently have multiple definitions of equality (pointer equality, structural equality on some members (type_hash_eq), equality based on compatibility (gimple_type_eq), equality based on compatibility ignoring incomplete submembers (gimple_canonical_type_eq), and some adhoc variants working for only a subset of types). > Or would I have to come up with my own encoding somehow? You would have to, yes. But see above, it's not totally trivial. You'll have to carefully think about when types are the same. Ciao, Michael.
