[Vala] C code generator

[Luis Santos <luis luissantos pt>]

I'm trying to use vala to create plugins (shared libraries) for
another program.

I would like to write some attributes on my classes and add extra C code 
in compile
time based on those attributes.

How can i write my custom attributes? and parse and execute them.
And how can i generate custom C code ?

I'm still trying to figure how code vala code generation works so any 
information
will be useful.

https://live.gnome.org/Vala/Hacking is good start but not enough.


Thanks,
L.S.