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1 | /* | |
2 | * This file is part of the libsigrokdecode project. | |
3 | * | |
4 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <config.h> | |
21 | #include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ | |
22 | #include "libsigrokdecode.h" | |
23 | #include <stdarg.h> | |
24 | #include <glib.h> | |
25 | ||
26 | static char *py_stringify(PyObject *py_obj) | |
27 | { | |
28 | PyObject *py_str, *py_bytes; | |
29 | char *str = NULL; | |
30 | ||
31 | /* Note: Caller already ran PyGILState_Ensure(). */ | |
32 | ||
33 | if (!py_obj) | |
34 | return NULL; | |
35 | ||
36 | py_str = PyObject_Str(py_obj); | |
37 | if (!py_str || !PyUnicode_Check(py_str)) | |
38 | goto cleanup; | |
39 | ||
40 | py_bytes = PyUnicode_AsUTF8String(py_str); | |
41 | if (!py_bytes) | |
42 | goto cleanup; | |
43 | ||
44 | str = g_strdup(PyBytes_AsString(py_bytes)); | |
45 | Py_DECREF(py_bytes); | |
46 | ||
47 | cleanup: | |
48 | Py_XDECREF(py_str); | |
49 | if (!str) { | |
50 | PyErr_Clear(); | |
51 | srd_dbg("Failed to stringify object."); | |
52 | } | |
53 | return str; | |
54 | } | |
55 | ||
56 | static char *py_get_string_attr(PyObject *py_obj, const char *attr) | |
57 | { | |
58 | PyObject *py_str, *py_bytes; | |
59 | char *str = NULL; | |
60 | ||
61 | /* Note: Caller already ran PyGILState_Ensure(). */ | |
62 | ||
63 | if (!py_obj) | |
64 | return NULL; | |
65 | ||
66 | py_str = PyObject_GetAttrString(py_obj, attr); | |
67 | if (!py_str || !PyUnicode_Check(py_str)) | |
68 | goto cleanup; | |
69 | ||
70 | py_bytes = PyUnicode_AsUTF8String(py_str); | |
71 | if (!py_bytes) | |
72 | goto cleanup; | |
73 | ||
74 | str = g_strdup(PyBytes_AsString(py_bytes)); | |
75 | Py_DECREF(py_bytes); | |
76 | ||
77 | cleanup: | |
78 | Py_XDECREF(py_str); | |
79 | if (!str) { | |
80 | PyErr_Clear(); | |
81 | srd_dbg("Failed to get object attribute %s.", attr); | |
82 | } | |
83 | return str; | |
84 | } | |
85 | ||
86 | /** @private */ | |
87 | SRD_PRIV void srd_exception_catch(const char *format, ...) | |
88 | { | |
89 | int i, ret; | |
90 | va_list args; | |
91 | PyObject *py_etype, *py_evalue, *py_etraceback; | |
92 | PyObject *py_mod, *py_func, *py_tracefmt; | |
93 | char *msg, *etype_name, *evalue_str, *outstr; | |
94 | const char *etype_name_fallback; | |
95 | PyGILState_STATE gstate; | |
96 | GString *s; | |
97 | ||
98 | py_etype = py_evalue = py_etraceback = py_mod = py_func = NULL; | |
99 | ||
100 | va_start(args, format); | |
101 | msg = g_strdup_vprintf(format, args); | |
102 | va_end(args); | |
103 | ||
104 | gstate = PyGILState_Ensure(); | |
105 | ||
106 | PyErr_Fetch(&py_etype, &py_evalue, &py_etraceback); | |
107 | if (!py_etype) { | |
108 | /* No current exception, so just print the message. */ | |
109 | srd_err("%s.", msg); | |
110 | goto cleanup; | |
111 | } | |
112 | PyErr_NormalizeException(&py_etype, &py_evalue, &py_etraceback); | |
113 | ||
114 | etype_name = py_get_string_attr(py_etype, "__name__"); | |
115 | evalue_str = py_stringify(py_evalue); | |
116 | etype_name_fallback = (etype_name) ? etype_name : "(unknown exception)"; | |
117 | ||
118 | if (evalue_str) | |
119 | srd_err("%s: %s: %s", etype_name_fallback, msg, evalue_str); | |
120 | else | |
121 | srd_err("%s: %s.", etype_name_fallback, msg); | |
122 | ||
123 | g_free(evalue_str); | |
124 | g_free(etype_name); | |
125 | ||
126 | /* If there is no traceback object, we are done. */ | |
127 | if (!py_etraceback) | |
128 | goto cleanup; | |
129 | ||
130 | py_mod = py_import_by_name("traceback"); | |
131 | if (!py_mod) | |
132 | goto cleanup; | |
133 | ||
134 | py_func = PyObject_GetAttrString(py_mod, "format_exception"); | |
135 | if (!py_func || !PyCallable_Check(py_func)) | |
136 | goto cleanup; | |
137 | ||
138 | /* Call into Python to format the stack trace. */ | |
139 | py_tracefmt = PyObject_CallFunctionObjArgs(py_func, | |
140 | py_etype, py_evalue, py_etraceback, NULL); | |
141 | if (!py_tracefmt || !PyList_Check(py_tracefmt)) | |
142 | goto cleanup; | |
143 | ||
144 | s = g_string_sized_new(128); | |
145 | for (i = 0; i < PyList_Size(py_tracefmt); i++) { | |
146 | ret = py_listitem_as_str(py_tracefmt, i, &outstr); | |
147 | if (ret == 0) { | |
148 | s = g_string_append(s, outstr); | |
149 | g_free(outstr); | |
150 | } | |
151 | } | |
152 | srd_err("%s", s->str); | |
153 | g_string_free(s, TRUE); | |
154 | ||
155 | Py_DECREF(py_tracefmt); | |
156 | ||
157 | cleanup: | |
158 | Py_XDECREF(py_func); | |
159 | Py_XDECREF(py_mod); | |
160 | Py_XDECREF(py_etraceback); | |
161 | Py_XDECREF(py_evalue); | |
162 | Py_XDECREF(py_etype); | |
163 | ||
164 | /* Just in case. */ | |
165 | PyErr_Clear(); | |
166 | ||
167 | PyGILState_Release(gstate); | |
168 | ||
169 | g_free(msg); | |
170 | } |