/* Python interface to new object file loading events.

   Copyright (C) 2011-2022 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"

static gdbpy_ref<>
create_new_objfile_event_object (struct objfile *objfile)
{
  gdbpy_ref<> objfile_event
    = create_event_object (&new_objfile_event_object_type);
  if (objfile_event == NULL)
    return NULL;

  gdbpy_ref<> py_objfile = objfile_to_objfile_object (objfile);
  if (py_objfile == NULL || evpy_add_attribute (objfile_event.get (),
						"new_objfile",
						py_objfile.get ()) < 0)
    return NULL;

  return objfile_event;
}

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

int
emit_new_objfile_event (struct objfile *objfile)
{
  if (evregpy_no_listeners_p (gdb_py_events.new_objfile))
    return 0;

  gdbpy_ref<> event = create_new_objfile_event_object (objfile);
  if (event != NULL)
    return evpy_emit_event (event.get (), gdb_py_events.new_objfile);
  return -1;
}

/* Create an event object representing a to-be-freed objfile.  Return
   nullptr, with the Python exception set, on error.  */

static gdbpy_ref<>
create_free_objfile_event_object (struct objfile *objfile)
{
  gdbpy_ref<> objfile_event
    = create_event_object (&free_objfile_event_object_type);
  if (objfile_event == nullptr)
    return nullptr;

  gdbpy_ref<> py_objfile = objfile_to_objfile_object (objfile);
  if (py_objfile == nullptr
      || evpy_add_attribute (objfile_event.get (), "objfile",
			     py_objfile.get ()) < 0)
    return nullptr;

  return objfile_event;
}

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

int
emit_free_objfile_event (struct objfile *objfile)
{
  if (evregpy_no_listeners_p (gdb_py_events.free_objfile))
    return 0;

  gdbpy_ref<> event = create_free_objfile_event_object (objfile);
  if (event == nullptr)
    return -1;
  return evpy_emit_event (event.get (), gdb_py_events.free_objfile);
}


/* Subroutine of emit_clear_objfiles_event to simplify it.  */

static gdbpy_ref<>
create_clear_objfiles_event_object (void)
{
  gdbpy_ref<> objfile_event
    = create_event_object (&clear_objfiles_event_object_type);
  if (objfile_event == NULL)
    return NULL;

  gdbpy_ref<> py_progspace = pspace_to_pspace_object (current_program_space);
  if (py_progspace == NULL || evpy_add_attribute (objfile_event.get (),
						  "progspace",
						  py_progspace.get ()) < 0)
    return NULL;

  return objfile_event;
}

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

int
emit_clear_objfiles_event (void)
{
  if (evregpy_no_listeners_p (gdb_py_events.clear_objfiles))
    return 0;

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