1 /* Python interface to inferior thread event registries. 2 3 Copyright (C) 2009, 2010, 2011 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 static PyTypeObject eventregistry_object_type; 25 26 /* Implementation of EventRegistry.connect () -> NULL. 27 Add FUNCTION to the list of listeners. */ 28 29 static PyObject * 30 evregpy_connect (PyObject *self, PyObject *function) 31 { 32 PyObject *func; 33 PyObject *callback_list = (((eventregistry_object *) self)->callbacks); 34 35 if (!PyArg_ParseTuple (function, "O", &func)) 36 return NULL; 37 38 if (!PyCallable_Check (func)) 39 { 40 PyErr_SetString (PyExc_RuntimeError, "Function is not callable"); 41 return NULL; 42 } 43 44 if (PyList_Append (callback_list, func) < 0) 45 return NULL; 46 47 Py_RETURN_NONE; 48 } 49 50 /* Implementation of EventRegistry.disconnect () -> NULL. 51 Remove FUNCTION from the list of listeners. */ 52 53 static PyObject * 54 evregpy_disconnect (PyObject *self, PyObject *function) 55 { 56 PyObject *func; 57 int index; 58 PyObject *callback_list = (((eventregistry_object *) self)->callbacks); 59 60 if (!PyArg_ParseTuple (function, "O", &func)) 61 return NULL; 62 63 index = PySequence_Index (callback_list, func); 64 if (index < 0) 65 Py_RETURN_NONE; 66 67 if (PySequence_DelItem (callback_list, index) < 0) 68 return NULL; 69 70 Py_RETURN_NONE; 71 } 72 73 /* Create a new event registry. This function uses PyObject_New 74 and therefore returns a new reference that callers must handle. */ 75 76 eventregistry_object * 77 create_eventregistry_object (void) 78 { 79 eventregistry_object *eventregistry_obj; 80 81 eventregistry_obj = PyObject_New (eventregistry_object, 82 &eventregistry_object_type); 83 84 if (!eventregistry_obj) 85 return NULL; 86 87 eventregistry_obj->callbacks = PyList_New (0); 88 if (!eventregistry_obj->callbacks) 89 return NULL; 90 91 return eventregistry_obj; 92 } 93 94 static void 95 evregpy_dealloc (PyObject *self) 96 { 97 Py_XDECREF (((eventregistry_object *) self)->callbacks); 98 self->ob_type->tp_free (self); 99 } 100 101 /* Initialize the Python event registry code. */ 102 103 void 104 gdbpy_initialize_eventregistry (void) 105 { 106 if (PyType_Ready (&eventregistry_object_type) < 0) 107 return; 108 109 Py_INCREF (&eventregistry_object_type); 110 PyModule_AddObject (gdb_module, "EventRegistry", 111 (PyObject *) &eventregistry_object_type); 112 } 113 114 /* Retern the number of listeners currently connected to this 115 registry. */ 116 117 int 118 evregpy_no_listeners_p (eventregistry_object *registry) 119 { 120 return PyList_Size (registry->callbacks) == 0; 121 } 122 123 static PyMethodDef eventregistry_object_methods[] = 124 { 125 { "connect", evregpy_connect, METH_VARARGS, "Add function" }, 126 { "disconnect", evregpy_disconnect, METH_VARARGS, "Remove function" }, 127 { NULL } /* Sentinel. */ 128 }; 129 130 static PyTypeObject eventregistry_object_type = 131 { 132 PyObject_HEAD_INIT (NULL) 133 0, /* ob_size */ 134 "gdb.EventRegistry", /* tp_name */ 135 sizeof (eventregistry_object), /* tp_basicsize */ 136 0, /* tp_itemsize */ 137 evregpy_dealloc, /* tp_dealloc */ 138 0, /* tp_print */ 139 0, /* tp_getattr */ 140 0, /* tp_setattr */ 141 0, /* tp_compare */ 142 0, /* tp_repr */ 143 0, /* tp_as_number */ 144 0, /* tp_as_sequence */ 145 0, /* tp_as_mapping */ 146 0, /* tp_hash */ 147 0, /* tp_call */ 148 0, /* tp_str */ 149 0, /* tp_getattro */ 150 0, /* tp_setattro */ 151 0, /* tp_as_buffer */ 152 Py_TPFLAGS_DEFAULT, /* tp_flags */ 153 "GDB event registry object", /* tp_doc */ 154 0, /* tp_traverse */ 155 0, /* tp_clear */ 156 0, /* tp_richcompare */ 157 0, /* tp_weaklistoffset */ 158 0, /* tp_iter */ 159 0, /* tp_iternext */ 160 eventregistry_object_methods, /* tp_methods */ 161 0, /* tp_members */ 162 0, /* tp_getset */ 163 0, /* tp_base */ 164 0, /* tp_dict */ 165 0, /* tp_descr_get */ 166 0, /* tp_descr_set */ 167 0, /* tp_dictoffset */ 168 0, /* tp_init */ 169 0 /* tp_alloc */ 170 }; 171