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612a9870 PP |
1 | /* |
2 | * The MIT License (MIT) | |
3 | * | |
4 | * Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com> | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | ||
25 | #include "logging/comp-logging.h" | |
26 | ||
27 | ||
28 | /* | |
29 | * Useful Python objects. | |
30 | */ | |
31 | ||
32 | static PyObject *py_mod_bt2 = NULL; | |
33 | static PyObject *py_mod_bt2_exc_error_type = NULL; | |
34 | static PyObject *py_mod_bt2_exc_memory_error = NULL; | |
35 | static PyObject *py_mod_bt2_exc_try_again_type = NULL; | |
36 | static PyObject *py_mod_bt2_exc_stop_type = NULL; | |
37 | static PyObject *py_mod_bt2_exc_unknown_object_type = NULL; | |
38 | ||
39 | static | |
40 | void bt_bt2_init_from_bt2(void) | |
41 | { | |
42 | /* | |
43 | * This is called once the bt2 package is loaded. | |
44 | * | |
45 | * Those modules and functions are needed while the package is | |
46 | * used. Loading them here is safe because we know the bt2 | |
47 | * package is imported, and we know that the user cannot use the | |
48 | * code here without importing bt2 first. | |
49 | */ | |
50 | py_mod_bt2 = PyImport_ImportModule("bt2"); | |
51 | BT_ASSERT(py_mod_bt2); | |
52 | py_mod_bt2_exc_error_type = | |
53 | PyObject_GetAttrString(py_mod_bt2, "_Error"); | |
54 | BT_ASSERT(py_mod_bt2_exc_error_type); | |
55 | py_mod_bt2_exc_memory_error = | |
56 | PyObject_GetAttrString(py_mod_bt2, "_MemoryError"); | |
57 | BT_ASSERT(py_mod_bt2_exc_memory_error); | |
58 | py_mod_bt2_exc_try_again_type = | |
59 | PyObject_GetAttrString(py_mod_bt2, "TryAgain"); | |
60 | BT_ASSERT(py_mod_bt2_exc_try_again_type); | |
61 | py_mod_bt2_exc_stop_type = | |
62 | PyObject_GetAttrString(py_mod_bt2, "Stop"); | |
63 | BT_ASSERT(py_mod_bt2_exc_stop_type); | |
64 | py_mod_bt2_exc_unknown_object_type = | |
65 | PyObject_GetAttrString(py_mod_bt2, "UnknownObject"); | |
66 | BT_ASSERT(py_mod_bt2_exc_unknown_object_type); | |
67 | } | |
68 | ||
69 | static | |
70 | void bt_bt2_exit_handler(void) | |
71 | { | |
72 | /* | |
73 | * This is an exit handler (set by the bt2 package). | |
74 | * | |
75 | * We only give back the references that we took in | |
76 | * bt_bt2_init_from_bt2() here. The global variables continue | |
77 | * to exist for the code of this file, but they are now borrowed | |
78 | * references. If this code is executed, it means that somehow | |
79 | * the modules are still loaded, so it should be safe to use | |
80 | * them even without a strong reference. | |
81 | * | |
82 | * We cannot do this in the library's destructor because it | |
83 | * gets executed once Python is already finalized. | |
84 | */ | |
85 | Py_XDECREF(py_mod_bt2); | |
86 | Py_XDECREF(py_mod_bt2_exc_error_type); | |
87 | Py_XDECREF(py_mod_bt2_exc_try_again_type); | |
88 | Py_XDECREF(py_mod_bt2_exc_stop_type); | |
89 | Py_XDECREF(py_mod_bt2_exc_unknown_object_type); | |
90 | } |