annotate Python/traceback.c @ 58664:993f703a61ba

Merged revisions 77484,77487,77561,77570,77593,77603,77608,77667,77702-77703,77739,77858,77887,77889 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77484 | skip.montanaro | 2010-01-13 19:12:34 -0600 (Wed, 13 Jan 2010) | 4 lines Update PyEval_EvalFrame to PyEval_EvalFrameEx. This looks to have been done partially before. Also add a comment describing how this might have to work with different versions of the interpreter. ........ r77487 | ezio.melotti | 2010-01-14 05:34:10 -0600 (Thu, 14 Jan 2010) | 1 line Fixed typo ........ r77561 | georg.brandl | 2010-01-17 02:42:30 -0600 (Sun, 17 Jan 2010) | 1 line #7699: improve datetime docs: straightforward linking to strftime/strptime section, mark classmethods as such. ........ r77570 | georg.brandl | 2010-01-17 06:14:42 -0600 (Sun, 17 Jan 2010) | 1 line Add note about usage of STRINGLIB_EMPTY. ........ r77593 | georg.brandl | 2010-01-17 17:33:53 -0600 (Sun, 17 Jan 2010) | 1 line Fix internal reference. ........ r77603 | benjamin.peterson | 2010-01-18 17:07:56 -0600 (Mon, 18 Jan 2010) | 8 lines data descriptors do not override the class dictionary if __get__ is not defined Adjust documentation and add a test to verify this behavior. See http://mail.python.org/pipermail/python-dev/2010-January/095637.html for discussion. ........ r77608 | gregory.p.smith | 2010-01-19 02:19:03 -0600 (Tue, 19 Jan 2010) | 6 lines Do not compile stubs for the sha2 series hashes in the openssl hashlib module when the openssl version is too old to support them. That leads both compiled code bloat and to unittests attempting to test implementations that don't exist for comparison purposes on such platforms. ........ r77667 | mark.dickinson | 2010-01-21 12:32:27 -0600 (Thu, 21 Jan 2010) | 1 line Add two more test_strtod test values. ........ r77702 | georg.brandl | 2010-01-23 02:43:31 -0600 (Sat, 23 Jan 2010) | 1 line #7762: fix refcount annotation of PyUnicode_Tailmatch(). ........ r77703 | georg.brandl | 2010-01-23 02:47:54 -0600 (Sat, 23 Jan 2010) | 1 line #7725: fix referencing issue. ........ r77739 | benjamin.peterson | 2010-01-24 21:52:52 -0600 (Sun, 24 Jan 2010) | 1 line mention from_float() in error message ........ r77858 | georg.brandl | 2010-01-30 11:57:48 -0600 (Sat, 30 Jan 2010) | 1 line #7802: fix invalid example (heh). ........ r77887 | georg.brandl | 2010-01-31 12:51:49 -0600 (Sun, 31 Jan 2010) | 5 lines Fix-up ftplib documentation: move exception descriptions to toplevel, not inside a class remove attribution in "versionadded" spell and grammar check docstring of FTP_TLS ........ r77889 | michael.foord | 2010-01-31 13:59:26 -0600 (Sun, 31 Jan 2010) | 1 line Minor modification to unittest documentation. ........
author Benjamin Peterson <benjamin@python.org>
date Wed, 03 Feb 2010 02:35:45 +0000
parents 79718ee03986
children cab14be0ada1
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2 /* Traceback implementation */
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3
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4 #include "Python.h"
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6 #include "code.h"
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7 #include "frameobject.h"
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8 #include "structmember.h"
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9 #include "osdefs.h"
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10 #include "traceback.h"
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11 #ifdef HAVE_FCNTL_H
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12 #include <fcntl.h>
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13 #endif
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15 #define OFF(x) offsetof(PyTracebackObject, x)
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17 /* Method from Parser/tokenizer.c */
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18 extern char * PyTokenizer_FindEncoding(int);
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19
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20 static PyObject *
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21 tb_dir(PyTracebackObject *self)
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22 {
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23 return Py_BuildValue("[ssss]", "tb_frame", "tb_next",
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24 "tb_lasti", "tb_lineno");
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25 }
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26
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27 static PyMethodDef tb_methods[] = {
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28 {"__dir__", (PyCFunction)tb_dir, METH_NOARGS},
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29 {NULL, NULL, 0, NULL},
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30 };
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31
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32 static PyMemberDef tb_memberlist[] = {
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33 {"tb_next", T_OBJECT, OFF(tb_next), READONLY},
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34 {"tb_frame", T_OBJECT, OFF(tb_frame), READONLY},
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35 {"tb_lasti", T_INT, OFF(tb_lasti), READONLY},
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36 {"tb_lineno", T_INT, OFF(tb_lineno), READONLY},
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37 {NULL} /* Sentinel */
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38 };
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40 static void
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41 tb_dealloc(PyTracebackObject *tb)
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42 {
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43 PyObject_GC_UnTrack(tb);
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44 Py_TRASHCAN_SAFE_BEGIN(tb)
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45 Py_XDECREF(tb->tb_next);
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46 Py_XDECREF(tb->tb_frame);
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47 PyObject_GC_Del(tb);
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48 Py_TRASHCAN_SAFE_END(tb)
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49 }
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51 static int
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52 tb_traverse(PyTracebackObject *tb, visitproc visit, void *arg)
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53 {
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54 Py_VISIT(tb->tb_next);
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55 Py_VISIT(tb->tb_frame);
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56 return 0;
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57 }
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59 static void
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60 tb_clear(PyTracebackObject *tb)
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61 {
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62 Py_CLEAR(tb->tb_next);
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63 Py_CLEAR(tb->tb_frame);
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64 }
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66 PyTypeObject PyTraceBack_Type = {
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67 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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68 "traceback",
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69 sizeof(PyTracebackObject),
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70 0,
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71 (destructor)tb_dealloc, /*tp_dealloc*/
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72 0, /*tp_print*/
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73 0, /*tp_getattr*/
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74 0, /*tp_setattr*/
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75 0, /*tp_reserved*/
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76 0, /*tp_repr*/
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77 0, /*tp_as_number*/
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78 0, /*tp_as_sequence*/
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79 0, /*tp_as_mapping*/
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80 0, /* tp_hash */
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81 0, /* tp_call */
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82 0, /* tp_str */
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83 PyObject_GenericGetAttr, /* tp_getattro */
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84 0, /* tp_setattro */
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85 0, /* tp_as_buffer */
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86 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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87 0, /* tp_doc */
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88 (traverseproc)tb_traverse, /* tp_traverse */
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89 (inquiry)tb_clear, /* tp_clear */
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90 0, /* tp_richcompare */
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91 0, /* tp_weaklistoffset */
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92 0, /* tp_iter */
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93 0, /* tp_iternext */
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94 tb_methods, /* tp_methods */
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95 tb_memberlist, /* tp_members */
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96 0, /* tp_getset */
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97 0, /* tp_base */
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98 0, /* tp_dict */
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99 };
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100
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101 static PyTracebackObject *
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102 newtracebackobject(PyTracebackObject *next, PyFrameObject *frame)
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103 {
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104 PyTracebackObject *tb;
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105 if ((next != NULL && !PyTraceBack_Check(next)) ||
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106 frame == NULL || !PyFrame_Check(frame)) {
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107 PyErr_BadInternalCall();
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108 return NULL;
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109 }
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110 tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type);
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111 if (tb != NULL) {
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112 Py_XINCREF(next);
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113 tb->tb_next = next;
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114 Py_XINCREF(frame);
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115 tb->tb_frame = frame;
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116 tb->tb_lasti = frame->f_lasti;
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117 tb->tb_lineno = PyFrame_GetLineNumber(frame);
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118 PyObject_GC_Track(tb);
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119 }
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120 return tb;
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121 }
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122
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123 int
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124 PyTraceBack_Here(PyFrameObject *frame)
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125 {
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126 PyThreadState *tstate = PyThreadState_GET();
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127 PyTracebackObject *oldtb = (PyTracebackObject *) tstate->curexc_traceback;
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128 PyTracebackObject *tb = newtracebackobject(oldtb, frame);
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129 if (tb == NULL)
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130 return -1;
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131 tstate->curexc_traceback = (PyObject *)tb;
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132 Py_XDECREF(oldtb);
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133 return 0;
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134 }
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135
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136 static int
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137 _Py_FindSourceFile(const char* filename, char* namebuf, size_t namelen, int open_flags)
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138 {
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139 int i;
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140 int fd = -1;
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141 PyObject *v;
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142 Py_ssize_t _npath;
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143 int npath;
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144 size_t taillen;
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145 PyObject *syspath;
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146 const char* path;
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147 const char* tail;
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148 Py_ssize_t len;
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149
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150 /* Search tail of filename in sys.path before giving up */
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151 tail = strrchr(filename, SEP);
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152 if (tail == NULL)
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153 tail = filename;
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154 else
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155 tail++;
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156 taillen = strlen(tail);
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157
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158 syspath = PySys_GetObject("path");
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159 if (syspath == NULL || !PyList_Check(syspath))
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160 return -1;
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161 _npath = PyList_Size(syspath);
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162 npath = Py_SAFE_DOWNCAST(_npath, Py_ssize_t, int);
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163
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164 for (i = 0; i < npath; i++) {
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165 v = PyList_GetItem(syspath, i);
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166 if (v == NULL) {
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167 PyErr_Clear();
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168 break;
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169 }
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170 if (!PyUnicode_Check(v))
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171 continue;
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172 path = _PyUnicode_AsStringAndSize(v, &len);
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173 if (len + 1 + (Py_ssize_t)taillen >= (Py_ssize_t)namelen - 1)
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174 continue; /* Too long */
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175 strcpy(namebuf, path);
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176 if (strlen(namebuf) != len)
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177 continue; /* v contains '\0' */
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178 if (len > 0 && namebuf[len-1] != SEP)
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179 namebuf[len++] = SEP;
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180 strcpy(namebuf+len, tail);
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181 Py_BEGIN_ALLOW_THREADS
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182 fd = open(namebuf, open_flags);
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183 Py_END_ALLOW_THREADS
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184 if (0 <= fd) {
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185 return fd;
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186 }
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187 }
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188 return -1;
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189 }
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190
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191 int
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192 _Py_DisplaySourceLine(PyObject *f, const char *filename, int lineno, int indent)
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193 {
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194 int err = 0;
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195 int fd;
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196 int i;
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197 char *found_encoding;
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198 char *encoding;
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199 PyObject *fob = NULL;
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200 PyObject *lineobj = NULL;
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201 #ifdef O_BINARY
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202 const int open_flags = O_RDONLY | O_BINARY; /* necessary for Windows */
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203 #else
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204 const int open_flags = O_RDONLY;
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205 #endif
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206 char buf[MAXPATHLEN+1];
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207 Py_UNICODE *u, *p;
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208 Py_ssize_t len;
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209
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210 /* open the file */
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211 if (filename == NULL)
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212 return 0;
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213 Py_BEGIN_ALLOW_THREADS
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214 fd = open(filename, open_flags);
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215 Py_END_ALLOW_THREADS
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216 if (fd < 0) {
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217 fd = _Py_FindSourceFile(filename, buf, sizeof(buf), open_flags);
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218 if (fd < 0)
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219 return 0;
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220 filename = buf;
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221 }
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222
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223 /* use the right encoding to decode the file as unicode */
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224 found_encoding = PyTokenizer_FindEncoding(fd);
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225 encoding = (found_encoding != NULL) ? found_encoding :
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226 (char*)PyUnicode_GetDefaultEncoding();
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227 lseek(fd, 0, 0); /* Reset position */
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228 fob = PyFile_FromFd(fd, (char*)filename, "r", -1, (char*)encoding,
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229 NULL, NULL, 1);
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230 PyMem_FREE(found_encoding);
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231 if (fob == NULL) {
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232 PyErr_Clear();
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233 close(fd);
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234 return 0;
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235 }
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236
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237 /* get the line number lineno */
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238 for (i = 0; i < lineno; i++) {
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239 Py_XDECREF(lineobj);
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240 lineobj = PyFile_GetLine(fob, -1);
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241 if (!lineobj) {
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242 err = -1;
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243 break;
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244 }
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245 }
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246 Py_DECREF(fob);
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247 if (!lineobj || !PyUnicode_Check(lineobj)) {
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248 Py_XDECREF(lineobj);
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249 return err;
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250 }
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251
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252 /* remove the indentation of the line */
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253 u = PyUnicode_AS_UNICODE(lineobj);
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254 len = PyUnicode_GET_SIZE(lineobj);
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255 for (p=u; *p == ' ' || *p == '\t' || *p == '\014'; p++)
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256 len--;
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257 if (u != p) {
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258 PyObject *truncated;
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259 truncated = PyUnicode_FromUnicode(p, len);
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260 if (truncated) {
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261 Py_DECREF(lineobj);
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262 lineobj = truncated;
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263 } else {
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264 PyErr_Clear();
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265 }
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266 }
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267
49484
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268 /* Write some spaces before the line */
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269 strcpy(buf, " ");
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270 assert (strlen(buf) == 10);
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271 while (indent > 0) {
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272 if(indent < 10)
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273 buf[indent] = '\0';
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274 err = PyFile_WriteString(buf, f);
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275 if (err != 0)
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276 break;
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277 indent -= 10;
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278 }
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279
49484
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280 /* finally display the line */
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diff changeset
281 if (err == 0)
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282 err = PyFile_WriteObject(lineobj, f, Py_PRINT_RAW);
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283 Py_DECREF(lineobj);
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284 if (err == 0)
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285 err = PyFile_WriteString("\n", f);
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286 return err;
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287 }
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288
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289 static int
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290 tb_displayline(PyObject *f, const char *filename, int lineno, const char *name)
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291 {
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292 int err = 0;
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293 char linebuf[2000];
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294
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295 if (filename == NULL || name == NULL)
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296 return -1;
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297 /* This is needed by Emacs' compile command */
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298 #define FMT " File \"%.500s\", line %d, in %.500s\n"
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299 PyOS_snprintf(linebuf, sizeof(linebuf), FMT, filename, lineno, name);
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300 err = PyFile_WriteString(linebuf, f);
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301 if (err != 0)
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302 return err;
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diff changeset
303 return _Py_DisplaySourceLine(f, filename, lineno, 4);
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304 }
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305
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diff changeset
306 static int
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307 tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
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308 {
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diff changeset
309 int err = 0;
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310 long depth = 0;
31739
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diff changeset
311 PyTracebackObject *tb1 = tb;
1425
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diff changeset
312 while (tb1 != NULL) {
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313 depth++;
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314 tb1 = tb1->tb_next;
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315 }
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316 while (tb != NULL && err == 0) {
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317 if (depth <= limit) {
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318 err = tb_displayline(f,
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diff changeset
319 _PyUnicode_AsString(
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diff changeset
320 tb->tb_frame->f_code->co_filename),
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diff changeset
321 tb->tb_lineno,
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parents: 48499
diff changeset
322 _PyUnicode_AsString(tb->tb_frame->f_code->co_name));
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323 }
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324 depth--;
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325 tb = tb->tb_next;
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326 if (err == 0)
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327 err = PyErr_CheckSignals();
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328 }
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329 return err;
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330 }
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331
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332 #define PyTraceBack_LIMIT 1000
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333
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334 int
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335 PyTraceBack_Print(PyObject *v, PyObject *f)
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336 {
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337 int err;
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338 PyObject *limitv;
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339 long limit = PyTraceBack_LIMIT;
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340
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341 if (v == NULL)
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342 return 0;
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343 if (!PyTraceBack_Check(v)) {
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344 PyErr_BadInternalCall();
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345 return -1;
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346 }
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347 limitv = PySys_GetObject("tracebacklimit");
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348 if (limitv) {
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349 PyObject *exc_type, *exc_value, *exc_tb;
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350
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351 PyErr_Fetch(&exc_type, &exc_value, &exc_tb);
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f324631462a2 Cleanup: Replaced most PyInt_ aliases with PyLong_ and disabled the aliases in intobject.h
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diff changeset
352 limit = PyLong_AsLong(limitv);
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diff changeset
353 if (limit == -1 && PyErr_Occurred()) {
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
354 if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
355 limit = PyTraceBack_LIMIT;
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
356 }
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
357 else {
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
358 Py_XDECREF(exc_type);
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
359 Py_XDECREF(exc_value);
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
360 Py_XDECREF(exc_tb);
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
361 return 0;
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
362 }
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
363 }
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
364 else if (limit <= 0) {
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
365 limit = PyTraceBack_LIMIT;
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
366 }
565012d1123d Removed another occurrence of PyInt_ExactCheck()
Christian Heimes <christian@cheimes.de>
parents: 44099
diff changeset
367 PyErr_Restore(exc_type, exc_value, exc_tb);
1425
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
368 }
12137
5b5581af951c Change traceback error message to "most recent call last" from
Guido van Rossum <guido@python.org>
parents: 11999
diff changeset
369 err = PyFile_WriteString("Traceback (most recent call last):\n", f);
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
370 if (!err)
31739
49ec0d8f08ec Moved tracebackobject to traceback.h, Closes SF Bug #497067
Nicholas Bastin <nick.bastin@gmail.com>
parents: 30968
diff changeset
371 err = tb_printinternal((PyTracebackObject *)v, f, limit);
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
372 return err;
86
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
373 }