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/* Python interface to inferior thread event registries.
Copyright (C) 2009-2024 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 "command.h"
#include "py-events.h"
events_object gdb_py_events;
extern PyTypeObject eventregistry_object_type
CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("eventregistry_object");
/* Implementation of EventRegistry.connect () -> NULL.
Add FUNCTION to the list of listeners. */
static PyObject *
evregpy_connect (PyObject *self, PyObject *function)
{
PyObject *func;
PyObject *callback_list = (((eventregistry_object *) self)->callbacks);
if (!PyArg_ParseTuple (function, "O", &func))
return NULL;
if (!PyCallable_Check (func))
{
PyErr_SetString (PyExc_RuntimeError, "Function is not callable");
return NULL;
}
if (PyList_Append (callback_list, func) < 0)
return NULL;
Py_RETURN_NONE;
}
/* Implementation of EventRegistry.disconnect () -> NULL.
Remove FUNCTION from the list of listeners. */
static PyObject *
evregpy_disconnect (PyObject *self, PyObject *function)
{
PyObject *func;
int index;
PyObject *callback_list = (((eventregistry_object *) self)->callbacks);
if (!PyArg_ParseTuple (function, "O", &func))
return NULL;
index = PySequence_Index (callback_list, func);
if (index < 0)
Py_RETURN_NONE;
if (PySequence_DelItem (callback_list, index) < 0)
return NULL;
Py_RETURN_NONE;
}
/* Create a new event registry. This function uses PyObject_New
and therefore returns a new reference that callers must handle. */
eventregistry_object *
create_eventregistry_object (void)
{
gdbpy_ref<eventregistry_object>
eventregistry_obj (PyObject_New (eventregistry_object,
&eventregistry_object_type));
if (eventregistry_obj == NULL)
return NULL;
eventregistry_obj->callbacks = PyList_New (0);
if (!eventregistry_obj->callbacks)
return NULL;
return eventregistry_obj.release ();
}
static void
evregpy_dealloc (PyObject *self)
{
Py_XDECREF (((eventregistry_object *) self)->callbacks);
Py_TYPE (self)->tp_free (self);
}
/* Initialize the Python event registry code. */
static int CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION
gdbpy_initialize_eventregistry (void)
{
return gdbpy_type_ready (&eventregistry_object_type);
}
/* Return the number of listeners currently connected to this
registry. */
bool
evregpy_no_listeners_p (eventregistry_object *registry)
{
/* REGISTRY can be nullptr if gdb failed to find the data directory
at startup. */
return registry == nullptr || PyList_Size (registry->callbacks) == 0;
}
GDBPY_INITIALIZE_FILE (gdbpy_initialize_eventregistry);
static PyMethodDef eventregistry_object_methods[] =
{
{ "connect", evregpy_connect, METH_VARARGS, "Add function" },
{ "disconnect", evregpy_disconnect, METH_VARARGS, "Remove function" },
{ NULL } /* Sentinel. */
};
PyTypeObject eventregistry_object_type =
{
PyVarObject_HEAD_INIT (NULL, 0)
"gdb.EventRegistry", /* tp_name */
sizeof (eventregistry_object), /* tp_basicsize */
0, /* tp_itemsize */
evregpy_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
"GDB event registry object", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
eventregistry_object_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0 /* tp_alloc */
};
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