Hello All, (With Jeremie Salvucci we are trying to improve a bit gengtype, in particular w.r.t. plugins & perhaps C++; we will continue to improve http://gcc.gnu.org/ml/gcc-patches/2010-06/msg02178.html soon, taking into account Paolo's remarks)
I am not a C++ expert, so I am asking: what would be needs of gengtype w.r.t. C++ datatypes? I am only thinking here of garbage-collected types, ie GTY-ed types! Obviously, accepting plain C++ GTY-ed classes (with a single GTY-ed super-class) is a must (and is probably not that hard). Basically, this could be almost as simple as accepting class in gengtype everywhere struct is accepted (but I know it is not that simple; at least the gengtype parser has to evolve a lot!). My current intuitions are: * we don't need to accept any kind of multiple inheritance (for GTY-ed data) * I don't know exactly what should be wished with respect to templates. Tom Tromey (in CC) have a wonderful insight in http://gcc.gnu.org/ml/gcc/2010-06/msg00143.html but I probably did not understood all the details & the consequences. In particular I don't understand if the mark method in his example has to be supplied or generated. What I don't understand is, for GTY-ed template classes, do we really need to exactly use all the std container, or could we specialize them. My current feeling is that it would a lot easier for gengtype to require that GTY-ed vectors would be instantiated from a GCC specific template class, something like template<typename Elemtype> class gty_vector : std::vector<Elemtype> and require that, for GTY-ed C++ vectors, we would only accept for example gty_vector<tree> instead of std::vector<tree> ; but I may be very wrong! BTW, I am not supposing that gengtype & ggc will go away with C++ (on the contrary, I would guess that C++ will make some new useful features of GGC worthwhile; probably C++ could make almost easy the ability to add local Ggc-ed pointers, not only static or external ones.). Cheers. -- Basile STARYNKEVITCH http://starynkevitch.net/Basile/ email: basile<at>starynkevitch<dot>net mobile: +33 6 8501 2359 8, rue de la Faiencerie, 92340 Bourg La Reine, France *** opinions {are only mines, sont seulement les miennes} ***
