libsigrokdecode
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exception.c
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1 /*
2  * This file is part of the sigrok 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 "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
21 #include "sigrokdecode-internal.h"
22 #include "config.h"
23 #include <stdarg.h>
24 #include <glib.h>
25 #include <frameobject.h> /* Python header not pulled in by default. */
26 
27 SRD_PRIV void srd_exception_catch(const char *format, ...)
28 {
29  PyObject *etype, *evalue, *etb, *py_str;
30  PyTracebackObject *py_tb;
31  GString *msg;
32  va_list args;
33  char *ename, *str, *tracestr;
34 
35  if (!PyErr_Occurred())
36  /* Nothing is wrong. */
37  return;
38 
39  PyErr_Fetch(&etype, &evalue, &etb);
40  PyErr_NormalizeException(&etype, &evalue, &etb);
41 
42  if (!(py_str = PyObject_Str(evalue))) {
43  /* Shouldn't happen. */
44  srd_dbg("Failed to convert exception value to string.");
45  return;
46  }
47 
48  msg = g_string_sized_new(128);
49  va_start(args, format);
50  g_string_vprintf(msg, format, args);
51  va_end(args);
52 
53  /* Can be NULL. */
54  if (evalue)
55  ename = (char *)Py_TYPE(evalue)->tp_name;
56  else
57  ename = "(unknown exception)";
58 
59  /* Send the exception error message(s) to srd_err(). */
60  py_str_as_str(py_str, &str);
61  g_string_append(msg, ename);
62  g_string_append(msg, ": ");
63  g_string_append(msg, str);
64  Py_DecRef(py_str);
65  srd_err(msg->str);
66 
67  /* Send a more precise error location to srd_dbg(), if we have it. */
68  if (etb && etb != Py_None) {
69  tracestr = NULL;
70  py_tb = (PyTracebackObject *)etb;
71  py_str = PyUnicode_FromFormat("%U:%d in %U",
72  py_tb->tb_frame->f_code->co_filename,
73  py_tb->tb_frame->f_lineno,
74  py_tb->tb_frame->f_code->co_name);
75  py_str_as_str(py_str, &tracestr);
76  Py_DecRef(py_str);
77  g_string_printf(msg, "%s in %s: %s", ename, tracestr, str);
78  srd_dbg(msg->str);
79  g_free(tracestr);
80  }
81  g_free(str);
82  g_string_free(msg, TRUE);
83 
84  Py_XDECREF(etype);
85  Py_XDECREF(evalue);
86  Py_XDECREF(etb);
87 
88  /* Just in case. */
89  PyErr_Clear();
90 }