1 /* Python interface to inferior events. 2 3 Copyright (C) 2009-2016 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 "py-event.h" 22 23 void 24 evpy_dealloc (PyObject *self) 25 { 26 Py_XDECREF (((event_object *) self)->dict); 27 Py_TYPE (self)->tp_free (self); 28 } 29 30 PyObject * 31 create_event_object (PyTypeObject *py_type) 32 { 33 event_object *event_obj; 34 35 event_obj = PyObject_New (event_object, py_type); 36 if (!event_obj) 37 goto fail; 38 39 event_obj->dict = PyDict_New (); 40 if (!event_obj->dict) 41 goto fail; 42 43 return (PyObject*) event_obj; 44 45 fail: 46 Py_XDECREF (event_obj); 47 return NULL; 48 } 49 50 /* Add the attribute ATTR to the event object EVENT. In 51 python this attribute will be accessible by the name NAME. 52 returns 0 if the operation succeeds and -1 otherwise. This 53 function acquires a new reference to ATTR. */ 54 55 int 56 evpy_add_attribute (PyObject *event, char *name, PyObject *attr) 57 { 58 return PyObject_SetAttrString (event, name, attr); 59 } 60 61 /* Initialize the Python event code. */ 62 63 int 64 gdbpy_initialize_event (void) 65 { 66 return gdbpy_initialize_event_generic (&event_object_type, 67 "Event"); 68 } 69 70 /* Initialize the given event type. If BASE is not NULL it will 71 be set as the types base. 72 Returns 0 if initialization was successful -1 otherwise. */ 73 74 int 75 gdbpy_initialize_event_generic (PyTypeObject *type, 76 char *name) 77 { 78 if (PyType_Ready (type) < 0) 79 return -1; 80 81 return gdb_pymodule_addobject (gdb_module, name, (PyObject *) type); 82 } 83 84 85 /* Notify the list of listens that the given EVENT has occurred. 86 returns 0 if emit is successful -1 otherwise. */ 87 88 int 89 evpy_emit_event (PyObject *event, 90 eventregistry_object *registry) 91 { 92 PyObject *callback_list_copy = NULL; 93 Py_ssize_t i; 94 95 /* Create a copy of call back list and use that for 96 notifying listeners to avoid skipping callbacks 97 in the case of a callback being disconnected during 98 a notification. */ 99 callback_list_copy = PySequence_List (registry->callbacks); 100 if (!callback_list_copy) 101 goto fail; 102 103 for (i = 0; i < PyList_Size (callback_list_copy); i++) 104 { 105 PyObject *func = PyList_GetItem (callback_list_copy, i); 106 PyObject *func_result; 107 108 if (func == NULL) 109 goto fail; 110 111 func_result = PyObject_CallFunctionObjArgs (func, event, NULL); 112 113 if (func_result == NULL) 114 { 115 /* Print the trace here, but keep going -- we want to try to 116 call all of the callbacks even if one is broken. */ 117 gdbpy_print_stack (); 118 } 119 else 120 { 121 Py_DECREF (func_result); 122 } 123 } 124 125 Py_XDECREF (callback_list_copy); 126 Py_XDECREF (event); 127 return 0; 128 129 fail: 130 gdbpy_print_stack (); 131 Py_XDECREF (callback_list_copy); 132 Py_XDECREF (event); 133 return -1; 134 } 135 136 static PyGetSetDef event_object_getset[] = 137 { 138 { "__dict__", gdb_py_generic_dict, NULL, 139 "The __dict__ for this event.", &event_object_type }, 140 { NULL } 141 }; 142 143 PyTypeObject event_object_type = 144 { 145 PyVarObject_HEAD_INIT (NULL, 0) 146 "gdb.Event", /* tp_name */ 147 sizeof (event_object), /* tp_basicsize */ 148 0, /* tp_itemsize */ 149 evpy_dealloc, /* tp_dealloc */ 150 0, /* tp_print */ 151 0, /* tp_getattr */ 152 0, /* tp_setattr */ 153 0, /* tp_compare */ 154 0, /* tp_repr */ 155 0, /* tp_as_number */ 156 0, /* tp_as_sequence */ 157 0, /* tp_as_mapping */ 158 0, /* tp_hash */ 159 0, /* tp_call */ 160 0, /* tp_str */ 161 0, /* tp_getattro */ 162 0, /* tp_setattro */ 163 0, /* tp_as_buffer */ 164 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ 165 "GDB event object", /* tp_doc */ 166 0, /* tp_traverse */ 167 0, /* tp_clear */ 168 0, /* tp_richcompare */ 169 0, /* tp_weaklistoffset */ 170 0, /* tp_iter */ 171 0, /* tp_iternext */ 172 0, /* tp_methods */ 173 0, /* tp_members */ 174 event_object_getset, /* tp_getset */ 175 0, /* tp_base */ 176 0, /* tp_dict */ 177 0, /* tp_descr_get */ 178 0, /* tp_descr_set */ 179 offsetof (event_object, dict), /* tp_dictoffset */ 180 0, /* tp_init */ 181 0 /* tp_alloc */ 182 }; 183