- Probing GObject
The objective of this project of mine was to understand the underlying C calls in GObject. I generated an example application with a few classes and interface. I then pasted the files together and parsed with my C parser to generate a sexp style AST. Then, I used my C-pretty-printer (for the sexp AST) to genrerate a C file which contains no CPP macros.
If you ever wanted to know what was under all those CPP macros, here it is.
The file allinone.c has the entire program in one .c file.
** Introduction
bla
** Random Notes
- GType
A GType is an integer. The lower two bits are for TBD. The value is right shifted two bits to provide an index into a table of TypeNodes called static_fundamental_type_nodes.
On my system the maximum number of GTypes is 255. So, it seems, GObject is limit to around 200 interfaces. Seems small, so I must be missing something.
- Interfaces
Each (registered) interface gets a slot.
I'm a bit lost right now on how gobject finds an interface given a class.
type_lookup_iface_vtable_I seems to be looking for this but the code (in glib source file gtype.c) is not easily penetrated.