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c17a9e46 HZ |
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 | }; |