| 1 | /* Python interface to inferior thread event registries. |
| 2 | |
| 3 | Copyright (C) 2009-2017 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "command.h" |
| 22 | #include "py-events.h" |
| 23 | |
| 24 | events_object gdb_py_events; |
| 25 | |
| 26 | extern PyTypeObject eventregistry_object_type |
| 27 | CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("eventregistry_object"); |
| 28 | |
| 29 | /* Implementation of EventRegistry.connect () -> NULL. |
| 30 | Add FUNCTION to the list of listeners. */ |
| 31 | |
| 32 | static PyObject * |
| 33 | evregpy_connect (PyObject *self, PyObject *function) |
| 34 | { |
| 35 | PyObject *func; |
| 36 | PyObject *callback_list = (((eventregistry_object *) self)->callbacks); |
| 37 | |
| 38 | if (!PyArg_ParseTuple (function, "O", &func)) |
| 39 | return NULL; |
| 40 | |
| 41 | if (!PyCallable_Check (func)) |
| 42 | { |
| 43 | PyErr_SetString (PyExc_RuntimeError, "Function is not callable"); |
| 44 | return NULL; |
| 45 | } |
| 46 | |
| 47 | if (PyList_Append (callback_list, func) < 0) |
| 48 | return NULL; |
| 49 | |
| 50 | Py_RETURN_NONE; |
| 51 | } |
| 52 | |
| 53 | /* Implementation of EventRegistry.disconnect () -> NULL. |
| 54 | Remove FUNCTION from the list of listeners. */ |
| 55 | |
| 56 | static PyObject * |
| 57 | evregpy_disconnect (PyObject *self, PyObject *function) |
| 58 | { |
| 59 | PyObject *func; |
| 60 | int index; |
| 61 | PyObject *callback_list = (((eventregistry_object *) self)->callbacks); |
| 62 | |
| 63 | if (!PyArg_ParseTuple (function, "O", &func)) |
| 64 | return NULL; |
| 65 | |
| 66 | index = PySequence_Index (callback_list, func); |
| 67 | if (index < 0) |
| 68 | Py_RETURN_NONE; |
| 69 | |
| 70 | if (PySequence_DelItem (callback_list, index) < 0) |
| 71 | return NULL; |
| 72 | |
| 73 | Py_RETURN_NONE; |
| 74 | } |
| 75 | |
| 76 | /* Create a new event registry. This function uses PyObject_New |
| 77 | and therefore returns a new reference that callers must handle. */ |
| 78 | |
| 79 | eventregistry_object * |
| 80 | create_eventregistry_object (void) |
| 81 | { |
| 82 | eventregistry_object *eventregistry_obj; |
| 83 | |
| 84 | eventregistry_obj = PyObject_New (eventregistry_object, |
| 85 | &eventregistry_object_type); |
| 86 | |
| 87 | if (!eventregistry_obj) |
| 88 | return NULL; |
| 89 | |
| 90 | eventregistry_obj->callbacks = PyList_New (0); |
| 91 | if (!eventregistry_obj->callbacks) |
| 92 | { |
| 93 | Py_DECREF (eventregistry_obj); |
| 94 | return NULL; |
| 95 | } |
| 96 | |
| 97 | return eventregistry_obj; |
| 98 | } |
| 99 | |
| 100 | static void |
| 101 | evregpy_dealloc (PyObject *self) |
| 102 | { |
| 103 | Py_XDECREF (((eventregistry_object *) self)->callbacks); |
| 104 | Py_TYPE (self)->tp_free (self); |
| 105 | } |
| 106 | |
| 107 | /* Initialize the Python event registry code. */ |
| 108 | |
| 109 | int |
| 110 | gdbpy_initialize_eventregistry (void) |
| 111 | { |
| 112 | if (PyType_Ready (&eventregistry_object_type) < 0) |
| 113 | return -1; |
| 114 | |
| 115 | return gdb_pymodule_addobject (gdb_module, "EventRegistry", |
| 116 | (PyObject *) &eventregistry_object_type); |
| 117 | } |
| 118 | |
| 119 | /* Retern the number of listeners currently connected to this |
| 120 | registry. */ |
| 121 | |
| 122 | int |
| 123 | evregpy_no_listeners_p (eventregistry_object *registry) |
| 124 | { |
| 125 | return PyList_Size (registry->callbacks) == 0; |
| 126 | } |
| 127 | |
| 128 | static PyMethodDef eventregistry_object_methods[] = |
| 129 | { |
| 130 | { "connect", evregpy_connect, METH_VARARGS, "Add function" }, |
| 131 | { "disconnect", evregpy_disconnect, METH_VARARGS, "Remove function" }, |
| 132 | { NULL } /* Sentinel. */ |
| 133 | }; |
| 134 | |
| 135 | PyTypeObject eventregistry_object_type = |
| 136 | { |
| 137 | PyVarObject_HEAD_INIT (NULL, 0) |
| 138 | "gdb.EventRegistry", /* tp_name */ |
| 139 | sizeof (eventregistry_object), /* tp_basicsize */ |
| 140 | 0, /* tp_itemsize */ |
| 141 | evregpy_dealloc, /* tp_dealloc */ |
| 142 | 0, /* tp_print */ |
| 143 | 0, /* tp_getattr */ |
| 144 | 0, /* tp_setattr */ |
| 145 | 0, /* tp_compare */ |
| 146 | 0, /* tp_repr */ |
| 147 | 0, /* tp_as_number */ |
| 148 | 0, /* tp_as_sequence */ |
| 149 | 0, /* tp_as_mapping */ |
| 150 | 0, /* tp_hash */ |
| 151 | 0, /* tp_call */ |
| 152 | 0, /* tp_str */ |
| 153 | 0, /* tp_getattro */ |
| 154 | 0, /* tp_setattro */ |
| 155 | 0, /* tp_as_buffer */ |
| 156 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
| 157 | "GDB event registry object", /* tp_doc */ |
| 158 | 0, /* tp_traverse */ |
| 159 | 0, /* tp_clear */ |
| 160 | 0, /* tp_richcompare */ |
| 161 | 0, /* tp_weaklistoffset */ |
| 162 | 0, /* tp_iter */ |
| 163 | 0, /* tp_iternext */ |
| 164 | eventregistry_object_methods, /* tp_methods */ |
| 165 | 0, /* tp_members */ |
| 166 | 0, /* tp_getset */ |
| 167 | 0, /* tp_base */ |
| 168 | 0, /* tp_dict */ |
| 169 | 0, /* tp_descr_get */ |
| 170 | 0, /* tp_descr_set */ |
| 171 | 0, /* tp_dictoffset */ |
| 172 | 0, /* tp_init */ |
| 173 | 0 /* tp_alloc */ |
| 174 | }; |