client data for GCCJIT objects?

[Basile Starynkevitch]

Hello All,

It would be nice if some client data could be attached to each GCCJIT object.

Or at least, within libgccjit++.h, to be able to use gccjit::object as
some key either for std::map or for std::unordered_map (so either an
ordered relation on their internal address, or an equality test with
some hashing). Then a user compilation context could associate
application data with GCCJIT objects. This is quite useful: an
application JIT translating some bytecode or AST would keep an
association between GCCJIT objects and application values (think of
s-exprs for GUILE) and create GCCJIT objects only if none is
associated to some application value...

In C, on could dream of a function giving, from some GCCJIT object,
its unique index in the "recording" class.

// get the object of some given index in the context
gcc_jit_object* gcc_jit_get_object_from_index(gcc_jit_context* ctx, unsigned index);

// get the positive index of some object, or 0 if NULL is given
unsigned gcc_jit_object_index(gcc_jit_object*obj);

I would be very happy to have dynamic upcasts, e.g.

// check that an object is a field, otherwise return NULL
gcc_jit_field* gcc_jit_object_to_field(gcc_jit_object* obj);


Comments are welcome. I could supply a patch if explained how to do such things...

Regards.
-- 
Basile STARYNKEVITCH         http://starynkevitch.net/Basile/
email: basile<at>starynkevitch<dot>net   mobile: +33 6 8501 2359
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