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annotate Python/traceback.c @ 62389:907f564476be

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Issue #6543: Write the traceback in the terminal encoding instead of utf-8. Fix the encoding of the modules filename. Reindent also traceback.h, just because I hate tabs :-)
author Victor Stinner <victor.stinner@haypocalc.com>
date Thu, 17 Jun 2010 23:08:50 +0000
parents cab14be0ada1
children 46956a25c264
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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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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58
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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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65
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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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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 PyObject *
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137 _Py_FindSourceFile(PyObject *filename, char* namebuf, size_t namelen, PyObject *io)
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138 {
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139 Py_ssize_t i;
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140 PyObject *binary;
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141 PyObject *v;
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142 Py_ssize_t npath;
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143 size_t taillen;
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144 PyObject *syspath;
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145 const char* path;
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146 const char* tail;
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147 const char* filepath;
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148 Py_ssize_t len;
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149
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150 filepath = _PyUnicode_AsString(filename);
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151 if (filepath == NULL) {
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152 PyErr_Clear();
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153 return NULL;
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154 }
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155
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156 /* Search tail of filename in sys.path before giving up */
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157 tail = strrchr(filepath, SEP);
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158 if (tail == NULL)
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159 tail = filepath;
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160 else
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161 tail++;
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162 taillen = strlen(tail);
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163
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164 syspath = PySys_GetObject("path");
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165 if (syspath == NULL || !PyList_Check(syspath))
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166 return NULL;
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167 npath = PyList_Size(syspath);
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168
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169 for (i = 0; i < npath; i++) {
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170 v = PyList_GetItem(syspath, i);
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171 if (v == NULL) {
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172 PyErr_Clear();
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173 break;
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174 }
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175 if (!PyUnicode_Check(v))
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176 continue;
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177 path = _PyUnicode_AsStringAndSize(v, &len);
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178 if (path == NULL) {
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179 PyErr_Clear();
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180 continue;
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181 }
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182 if (len + 1 + (Py_ssize_t)taillen >= (Py_ssize_t)namelen - 1)
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183 continue; /* Too long */
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184 strcpy(namebuf, path);
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185 if (strlen(namebuf) != len)
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186 continue; /* v contains '\0' */
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187 if (len > 0 && namebuf[len-1] != SEP)
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188 namebuf[len++] = SEP;
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189 strcpy(namebuf+len, tail);
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190
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191 binary = PyObject_CallMethod(io, "open", "ss", namebuf, "rb");
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192 if (binary != NULL)
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193 return binary;
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194 PyErr_Clear();
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195 }
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196 return NULL;
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197 }
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198
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199 int
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200 _Py_DisplaySourceLine(PyObject *f, PyObject *filename, int lineno, int indent)
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201 {
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202 int err = 0;
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203 int fd;
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204 int i;
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205 char *found_encoding;
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206 char *encoding;
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207 PyObject *io;
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208 PyObject *binary;
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209 PyObject *fob = NULL;
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210 PyObject *lineobj = NULL;
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211 char buf[MAXPATHLEN+1];
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212 Py_UNICODE *u, *p;
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213 Py_ssize_t len;
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214
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215 /* open the file */
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216 if (filename == NULL)
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217 return 0;
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218
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219 io = PyImport_ImportModuleNoBlock("io");
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220 if (io == NULL)
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221 return -1;
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222 binary = PyObject_CallMethod(io, "open", "Os", filename, "rb");
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223
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224 if (binary == NULL) {
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225 binary = _Py_FindSourceFile(filename, buf, sizeof(buf), io);
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226 if (binary == NULL) {
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227 Py_DECREF(io);
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228 return 0;
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229 }
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230 }
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231
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232 /* use the right encoding to decode the file as unicode */
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233 fd = PyObject_AsFileDescriptor(binary);
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234 found_encoding = PyTokenizer_FindEncoding(fd);
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235 encoding = (found_encoding != NULL) ? found_encoding : "utf-8";
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236 lseek(fd, 0, 0); /* Reset position */
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237 fob = PyObject_CallMethod(io, "TextIOWrapper", "Os", binary, encoding);
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238 Py_DECREF(io);
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239 Py_DECREF(binary);
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240 PyMem_FREE(found_encoding);
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241
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242 if (fob == NULL) {
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243 PyErr_Clear();
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244 return 0;
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245 }
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246
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247 /* get the line number lineno */
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248 for (i = 0; i < lineno; i++) {
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249 Py_XDECREF(lineobj);
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250 lineobj = PyFile_GetLine(fob, -1);
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251 if (!lineobj) {
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252 err = -1;
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253 break;
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254 }
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255 }
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256 Py_DECREF(fob);
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257 if (!lineobj || !PyUnicode_Check(lineobj)) {
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258 Py_XDECREF(lineobj);
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259 return err;
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260 }
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261
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262 /* remove the indentation of the line */
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263 u = PyUnicode_AS_UNICODE(lineobj);
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264 len = PyUnicode_GET_SIZE(lineobj);
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265 for (p=u; *p == ' ' || *p == '\t' || *p == '\014'; p++)
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266 len--;
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267 if (u != p) {
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268 PyObject *truncated;
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269 truncated = PyUnicode_FromUnicode(p, len);
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270 if (truncated) {
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271 Py_DECREF(lineobj);
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272 lineobj = truncated;
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273 } else {
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274 PyErr_Clear();
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275 }
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276 }
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277
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278 /* Write some spaces before the line */
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279 strcpy(buf, " ");
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280 assert (strlen(buf) == 10);
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281 while (indent > 0) {
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282 if(indent < 10)
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283 buf[indent] = '\0';
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284 err = PyFile_WriteString(buf, f);
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285 if (err != 0)
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286 break;
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287 indent -= 10;
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288 }
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289
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290 /* finally display the line */
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291 if (err == 0)
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292 err = PyFile_WriteObject(lineobj, f, Py_PRINT_RAW);
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293 Py_DECREF(lineobj);
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294 if (err == 0)
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295 err = PyFile_WriteString("\n", f);
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296 return err;
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297 }
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298
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299 static int
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300 tb_displayline(PyObject *f, PyObject *filename, int lineno, PyObject *name)
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301 {
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302 int err;
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303 PyObject *line;
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304
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305 if (filename == NULL || name == NULL)
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306 return -1;
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307 line = PyUnicode_FromFormat(" File \"%U\", line %d, in %U\n",
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308 filename, lineno, name);
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309 if (line == NULL)
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310 return -1;
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311 err = PyFile_WriteObject(line, f, Py_PRINT_RAW);
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312 Py_DECREF(line);
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313 if (err != 0)
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314 return err;
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315 return _Py_DisplaySourceLine(f, filename, lineno, 4);
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316 }
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317
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318 static int
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319 tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
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320 {
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321 int err = 0;
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322 long depth = 0;
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323 PyTracebackObject *tb1 = tb;
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324 while (tb1 != NULL) {
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325 depth++;
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326 tb1 = tb1->tb_next;
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327 }
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328 while (tb != NULL && err == 0) {
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329 if (depth <= limit) {
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330 err = tb_displayline(f,
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331 tb->tb_frame->f_code->co_filename,
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332 tb->tb_lineno,
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333 tb->tb_frame->f_code->co_name);
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334 }
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335 depth--;
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336 tb = tb->tb_next;
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337 if (err == 0)
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338 err = PyErr_CheckSignals();
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339 }
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340 return err;
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341 }
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342
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343 #define PyTraceBack_LIMIT 1000
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344
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345 int
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346 PyTraceBack_Print(PyObject *v, PyObject *f)
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347 {
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348 int err;
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349 PyObject *limitv;
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350 long limit = PyTraceBack_LIMIT;
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351
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352 if (v == NULL)
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353 return 0;
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354 if (!PyTraceBack_Check(v)) {
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355 PyErr_BadInternalCall();
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356 return -1;
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357 }
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358 limitv = PySys_GetObject("tracebacklimit");
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359 if (limitv) {
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360 PyObject *exc_type, *exc_value, *exc_tb;
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361
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362 PyErr_Fetch(&exc_type, &exc_value, &exc_tb);
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363 limit = PyLong_AsLong(limitv);
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364 if (limit == -1 && PyErr_Occurred()) {
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365 if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
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366 limit = PyTraceBack_LIMIT;
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367 }
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368 else {
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369 Py_XDECREF(exc_type);
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370 Py_XDECREF(exc_value);
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371 Py_XDECREF(exc_tb);
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372 return 0;
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373 }
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374 }
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375 else if (limit <= 0) {
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376 limit = PyTraceBack_LIMIT;
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377 }
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378 PyErr_Restore(exc_type, exc_value, exc_tb);
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379 }
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380 err = PyFile_WriteString("Traceback (most recent call last):\n", f);
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381 if (!err)
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382 err = tb_printinternal((PyTracebackObject *)v, f, limit);
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383 return err;
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384 }