[PATCH 2/2] gdb/python: Reuse gdb.RegisterGroup objects where possible

[Tom Tromey]

>>>>> "Andrew" == Andrew Burgess <andrew.burgess@embecosm.com> writes:

Andrew> gdb/ChangeLog:

Andrew> 	* python/py-registers.c : Add 'unordered_map' include.
Andrew> 	(gdbpy_new_reggroup): Renamed to...
Andrew> 	(gdbpy_get_reggroup): ...this.  Update to only create register
Andrew> 	group descriptors when needed.
Andrew> 	(gdbpy_reggroup_iter_next): Update.

The idea looks good to me.

Andrew> +  /* Map from GDB's internal reggroup objects to the Python representation.
Andrew> +     GDB's reggroups are global, and are never deleted, so using a map like
Andrew> +     this is safe.  */
Andrew> +  static std::unordered_map<struct reggroup *,const reggroup_object *>
Andrew> +    gdbpy_reggroup_object_map;

The same comment about "const", etc, applies here as in the previous
patch.

Tom