[RFA 3/3] Make it simpler to add events to Python

[Simon Marchi]

On 2017-09-09 02:33, Tom Tromey wrote:
> The first patch in this series went through several iterations as I'd
> forgotten how many places had to be touched to add a new event and a
> new event type.
> 
> This patch simplifies the process using two new ".def" files.  Now, a
> new event type can be added by adding a line to "py-event-types.def",
> and a new event registry can be added by adding a line to
> "py-all-events.def".

Hi Tom,

This looks great.  The patch is ok, I have two little nits below, which 
you can address before pushing if you agree.

> diff --git a/gdb/python/py-event-types.def 
> b/gdb/python/py-event-types.def
> new file mode 100644
> index 0000000..d35cbe5
> --- /dev/null
> +++ b/gdb/python/py-event-types.def
> @@ -0,0 +1,120 @@
> +/* Python event definitions -*- c++ -*-
> +
> +   Copyright (C) 2017 Free Software Foundation, Inc.
> +
> +   This file is part of GDB.
> +
> +   This program is free software; you can redistribute it and/or 
> modify
> +   it under the terms of the GNU General Public License as published 
> by
> +   the Free Software Foundation; either version 3 of the License, or
> +   (at your option) any later version.
> +
> +   This program is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +   GNU General Public License for more details.
> +
> +   You should have received a copy of the GNU General Public License
> +   along with this program.  If not, see 
> <http://www.gnu.org/licenses/>.  */
> +
> +/* To use this file, define GDB_PY_DEFINE_EVENT_TYPE to expand how you
> +   like, then include the file.
> +

I think it would be clearer if you added the macro "prototype" here, 
otherwise the parameter names refer to nothing.

   GDB_PY_DEFINE_EVENT_TYPE (name, py_path, py_bame, doc, base) ...

> +   NAME is the name of the event.
> +   PY_PATH is a string representing the module and python name of
> +   the event.
> +   PY_NAME a string representing what the event should be called in
> +   python.
> +   DOC Python documentation for the new event type
> +   BASE the base event for this event usually just event_object_type.
> +*/
> +
> +GDB_PY_DEFINE_EVENT_TYPE (breakpoint,
> +			  "gdb.BreakpointEvent",
> +			  "BreakpointEvent",

The py_path and py_name are duplicated everywhere.  We could get rid of 
py_path.  At the only place where it is used, we can replace it with

   "gdb." py_name

Thanks,

Simon