Mercurial > cpython-lru_cache-weakref

annotate Python/traceback.c @ 68256:b36cb4602e21 2.7

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Dummy-merge 2.6 branch into 2.7 branch.
author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 15:15:07 +0100
parents fd25030223b0 e38335d4df91
children
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rev   line source
145
853b736a6a9e Added copyright notice.
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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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5
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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
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12 #define OFF(x) offsetof(PyTracebackObject, x)
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13
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14 static PyMemberDef tb_memberlist[] = {
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15 {"tb_next", T_OBJECT, OFF(tb_next), READONLY},
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16 {"tb_frame", T_OBJECT, OFF(tb_frame), READONLY},
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17 {"tb_lasti", T_INT, OFF(tb_lasti), READONLY},
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18 {"tb_lineno", T_INT, OFF(tb_lineno), READONLY},
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19 {NULL} /* Sentinel */
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20 };
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22 static void
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23 tb_dealloc(PyTracebackObject *tb)
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24 {
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25 PyObject_GC_UnTrack(tb);
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26 Py_TRASHCAN_SAFE_BEGIN(tb)
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27 Py_XDECREF(tb->tb_next);
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28 Py_XDECREF(tb->tb_frame);
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29 PyObject_GC_Del(tb);
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30 Py_TRASHCAN_SAFE_END(tb)
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31 }
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32
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33 static int
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34 tb_traverse(PyTracebackObject *tb, visitproc visit, void *arg)
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35 {
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36 Py_VISIT(tb->tb_next);
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37 Py_VISIT(tb->tb_frame);
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38 return 0;
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39 }
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41 static void
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42 tb_clear(PyTracebackObject *tb)
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43 {
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44 Py_CLEAR(tb->tb_next);
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45 Py_CLEAR(tb->tb_frame);
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46 }
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47
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48 PyTypeObject PyTraceBack_Type = {
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49 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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50 "traceback",
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51 sizeof(PyTracebackObject),
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52 0,
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53 (destructor)tb_dealloc, /*tp_dealloc*/
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54 0, /*tp_print*/
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55 0, /*tp_getattr*/
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56 0, /*tp_setattr*/
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57 0, /*tp_compare*/
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58 0, /*tp_repr*/
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59 0, /*tp_as_number*/
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60 0, /*tp_as_sequence*/
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61 0, /*tp_as_mapping*/
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62 0, /* tp_hash */
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63 0, /* tp_call */
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64 0, /* tp_str */
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65 0, /* tp_getattro */
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66 0, /* tp_setattro */
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67 0, /* tp_as_buffer */
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68 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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69 0, /* tp_doc */
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70 (traverseproc)tb_traverse, /* tp_traverse */
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71 (inquiry)tb_clear, /* tp_clear */
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72 0, /* tp_richcompare */
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73 0, /* tp_weaklistoffset */
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74 0, /* tp_iter */
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75 0, /* tp_iternext */
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76 0, /* tp_methods */
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77 tb_memberlist, /* tp_members */
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78 0, /* tp_getset */
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79 0, /* tp_base */
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80 0, /* tp_dict */
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81 };
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82
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83 static PyTracebackObject *
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84 newtracebackobject(PyTracebackObject *next, PyFrameObject *frame)
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85 {
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86 PyTracebackObject *tb;
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87 if ((next != NULL && !PyTraceBack_Check(next)) ||
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88 frame == NULL || !PyFrame_Check(frame)) {
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89 PyErr_BadInternalCall();
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90 return NULL;
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91 }
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92 tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type);
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93 if (tb != NULL) {
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94 Py_XINCREF(next);
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95 tb->tb_next = next;
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96 Py_XINCREF(frame);
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97 tb->tb_frame = frame;
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98 tb->tb_lasti = frame->f_lasti;
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99 tb->tb_lineno = PyFrame_GetLineNumber(frame);
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100 PyObject_GC_Track(tb);
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101 }
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102 return tb;
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103 }
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105 int
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106 PyTraceBack_Here(PyFrameObject *frame)
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107 {
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108 PyThreadState *tstate = PyThreadState_GET();
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109 PyTracebackObject *oldtb = (PyTracebackObject *) tstate->curexc_traceback;
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110 PyTracebackObject *tb = newtracebackobject(oldtb, frame);
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111 if (tb == NULL)
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112 return -1;
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113 tstate->curexc_traceback = (PyObject *)tb;
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114 Py_XDECREF(oldtb);
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115 return 0;
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116 }
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117
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118 int
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119 _Py_DisplaySourceLine(PyObject *f, const char *filename, int lineno, int indent)
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120 {
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121 int err = 0;
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122 FILE *xfp = NULL;
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123 char linebuf[2000];
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124 int i;
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125 char namebuf[MAXPATHLEN+1];
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126
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127 if (filename == NULL)
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128 return -1;
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129 /* This is needed by Emacs' compile command */
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130 #define FMT " File \"%.500s\", line %d, in %.500s\n"
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131 xfp = fopen(filename, "r" PY_STDIOTEXTMODE);
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132 if (xfp == NULL) {
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133 /* Search tail of filename in sys.path before giving up */
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134 PyObject *path;
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135 const char *tail = strrchr(filename, SEP);
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136 if (tail == NULL)
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137 tail = filename;
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138 else
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139 tail++;
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140 path = PySys_GetObject("path");
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141 if (path != NULL && PyList_Check(path)) {
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142 Py_ssize_t _npath = PyList_Size(path);
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143 int npath = Py_SAFE_DOWNCAST(_npath, Py_ssize_t, int);
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144 size_t taillen = strlen(tail);
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145 for (i = 0; i < npath; i++) {
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146 PyObject *v = PyList_GetItem(path, i);
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147 if (v == NULL) {
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148 PyErr_Clear();
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149 break;
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150 }
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151 if (PyString_Check(v)) {
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152 size_t len;
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153 len = PyString_GET_SIZE(v);
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154 if (len + 1 + taillen >= MAXPATHLEN)
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155 continue; /* Too long */
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156 strcpy(namebuf, PyString_AsString(v));
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157 if (strlen(namebuf) != len)
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158 continue; /* v contains '\0' */
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159 if (len > 0 && namebuf[len-1] != SEP)
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160 namebuf[len++] = SEP;
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161 strcpy(namebuf+len, tail);
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162 xfp = fopen(namebuf, "r" PY_STDIOTEXTMODE);
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163 if (xfp != NULL) {
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164 break;
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165 }
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166 }
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167 }
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168 }
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169 }
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170
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171 if (xfp == NULL)
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172 return err;
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173 if (err != 0) {
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174 fclose(xfp);
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175 return err;
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176 }
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177
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178 for (i = 0; i < lineno; i++) {
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179 char* pLastChar = &linebuf[sizeof(linebuf)-2];
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180 do {
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181 *pLastChar = '\0';
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182 if (Py_UniversalNewlineFgets(linebuf, sizeof linebuf, xfp, NULL) == NULL)
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183 break;
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184 /* fgets read *something*; if it didn't get as
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185 far as pLastChar, it must have found a newline
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186 or hit the end of the file; if pLastChar is \n,
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187 it obviously found a newline; else we haven't
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188 yet seen a newline, so must continue */
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189 } while (*pLastChar != '\0' && *pLastChar != '\n');
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190 }
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191 if (i == lineno) {
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192 char buf[11];
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193 char *p = linebuf;
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194 while (*p == ' ' || *p == '\t' || *p == '\014')
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195 p++;
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196
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197 /* Write some spaces before the line */
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198 strcpy(buf, " ");
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199 assert (strlen(buf) == 10);
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200 while (indent > 0) {
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201 if(indent < 10)
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202 buf[indent] = '\0';
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203 err = PyFile_WriteString(buf, f);
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204 if (err != 0)
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205 break;
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206 indent -= 10;
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207 }
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208
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209 if (err == 0)
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210 err = PyFile_WriteString(p, f);
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211 if (err == 0 && strchr(p, '\n') == NULL)
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212 err = PyFile_WriteString("\n", f);
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213 }
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214 fclose(xfp);
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215 return err;
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216 }
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217
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218 static int
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219 tb_displayline(PyObject *f, const char *filename, int lineno, const char *name)
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220 {
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221 int err = 0;
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222 char linebuf[2000];
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223
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224 if (filename == NULL || name == NULL)
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225 return -1;
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226 /* This is needed by Emacs' compile command */
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227 #define FMT " File \"%.500s\", line %d, in %.500s\n"
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228 PyOS_snprintf(linebuf, sizeof(linebuf), FMT, filename, lineno, name);
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229 err = PyFile_WriteString(linebuf, f);
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230 if (err != 0)
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231 return err;
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232 return _Py_DisplaySourceLine(f, filename, lineno, 4);
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233 }
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234
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235 static int
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236 tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
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237 {
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238 int err = 0;
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239 long depth = 0;
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240 PyTracebackObject *tb1 = tb;
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241 while (tb1 != NULL) {
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242 depth++;
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243 tb1 = tb1->tb_next;
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244 }
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245 while (tb != NULL && err == 0) {
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246 if (depth <= limit) {
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247 err = tb_displayline(f,
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248 PyString_AsString(
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249 tb->tb_frame->f_code->co_filename),
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250 tb->tb_lineno,
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251 PyString_AsString(tb->tb_frame->f_code->co_name));
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252 }
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253 depth--;
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254 tb = tb->tb_next;
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255 if (err == 0)
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256 err = PyErr_CheckSignals();
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257 }
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258 return err;
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259 }
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260
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261 int
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262 PyTraceBack_Print(PyObject *v, PyObject *f)
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263 {
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264 int err;
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265 PyObject *limitv;
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266 long limit = 1000;
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267 if (v == NULL)
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268 return 0;
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269 if (!PyTraceBack_Check(v)) {
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270 PyErr_BadInternalCall();
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271 return -1;
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272 }
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273 limitv = PySys_GetObject("tracebacklimit");
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274 if (limitv && PyInt_Check(limitv)) {
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275 limit = PyInt_AsLong(limitv);
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276 if (limit <= 0)
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277 return 0;
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278 }
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279 err = PyFile_WriteString("Traceback (most recent call last):\n", f);
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280 if (!err)
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281 err = tb_printinternal((PyTracebackObject *)v, f, limit);
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282 return err;
86
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
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283 }