[RFC - Python] New ObjFile event

[Kevin Pouget <kevin dot pouget at gmail dot com>]

Hello,

following this discussion at
http://sourceware.org/ml/gdb/2011-03/msg00136.html, I would like to
suggest a patch for the Python event system. Based on the ''exited",
"cont", ... events, this patch allows a python script to register an
interest to the loading of new object files in the debuggee. GDB
observer "observer_attach_new_objfile" is used to trigger the Python
callback.

This patch completes the auto-loading feature
(http://sourceware.org/gdb/current/onlinedocs/gdb/objfile_002dgdb_002epy-file.html#objfile_002dgdb_002epy-file),
and, likewise, allows Python's "gdb.current_objfile ()" to return the current
object file.

Here is an example of it utilization:

> def obj_handler (event):
> ? ? ? if gdb.current_objfile () is not None:
> ? ? ? ? ? ? ? print "-->",gdb.current_objfile ().filename
> ? ? ? else:
> ? ? ? ? ? ? ? print "---------------->Cleanup"
>
> gdb.events.newobjfile.connect (obj_handler)


There is still one thing I'm not happy with in the code, it's how to
'properly' access "gdbpy_current_objfile" ? I commented out "static"
and declared it "extern" when I needed it, but that's certainly not
the best way:

gdb/python/python.c
/*static*/ struct objfile *gdbpy_current_objfile;
gdb/python/py-inferior.c
extern struct objfile *gdbpy_current_objfile;


please let me know what you thing about it

Cordially,

Kevin

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