gdb: Convert language la_read_var_value field to a method

[deliverable/binutils-gdb.git] / gdb / python / py-continueevent.c

/* Python interface to inferior continue events.

   Copyright (C) 2009-2020 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/>.  */

#include "defs.h"
#include "py-event.h"
#include "gdbthread.h"

/* Create a gdb.ContinueEvent event.  gdb.ContinueEvent is-a
   gdb.ThreadEvent, and thread events can either be thread specific or
   process wide.  If gdb is running in non-stop mode then the event is
   thread specific (in which case the PTID thread is included in the
   event), otherwise it is process wide (in which case PTID is
   ignored).  In either case a new reference is returned.  */

static gdbpy_ref<>
create_continue_event_object (ptid_t ptid)
{
  gdbpy_ref<> py_thr = py_get_event_thread (ptid);

  if (py_thr == nullptr)
    return nullptr;

  return create_thread_event_object (&continue_event_object_type,
				     py_thr.get ());
}

/* Callback function which notifies observers when a continue event occurs.
   This function will create a new Python continue event object.
   Return -1 if emit fails.  */

int
emit_continue_event (ptid_t ptid)
{
  if (evregpy_no_listeners_p (gdb_py_events.cont))
    return 0;

  gdbpy_ref<> event = create_continue_event_object (ptid);
  if (event != NULL)
    return evpy_emit_event (event.get (), gdb_py_events.cont);
  return -1;
}