annotate Python/traceback.c @ 46414:840064802952 legacy-trunk

Re-implement the 'warnings' module in C. This allows for usage of the 'warnings' code in places where it was previously not possible (e.g., the parser). It could also potentially lead to a speed-up in interpreter start-up if the C version of the code (_warnings) is imported over the use of the Python version in key places. Closes issue #1631171.
author Brett Cannon <bcannon@gmail.com>
date Sat, 12 Apr 2008 23:44:07 +0000
parents a3bf0e24b91e
children 07a4e1710262
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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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12 #define OFF(x) offsetof(PyTracebackObject, x)
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13
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14 static struct memberlist tb_memberlist[] = {
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15 {"tb_next", T_OBJECT, OFF(tb_next)},
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16 {"tb_frame", T_OBJECT, OFF(tb_frame)},
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17 {"tb_lasti", T_INT, OFF(tb_lasti)},
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18 {"tb_lineno", T_INT, OFF(tb_lineno)},
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19 {NULL} /* Sentinel */
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20 };
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22 static PyObject *
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23 tb_getattr(PyTracebackObject *tb, char *name)
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24 {
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25 return PyMember_Get((char *)tb, tb_memberlist, name);
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26 }
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28 static void
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29 tb_dealloc(PyTracebackObject *tb)
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30 {
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31 PyObject_GC_UnTrack(tb);
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32 Py_TRASHCAN_SAFE_BEGIN(tb)
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33 Py_XDECREF(tb->tb_next);
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34 Py_XDECREF(tb->tb_frame);
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35 PyObject_GC_Del(tb);
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36 Py_TRASHCAN_SAFE_END(tb)
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37 }
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39 static int
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40 tb_traverse(PyTracebackObject *tb, visitproc visit, void *arg)
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41 {
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42 Py_VISIT(tb->tb_next);
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43 Py_VISIT(tb->tb_frame);
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44 return 0;
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45 }
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47 static void
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48 tb_clear(PyTracebackObject *tb)
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49 {
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50 Py_CLEAR(tb->tb_next);
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51 Py_CLEAR(tb->tb_frame);
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52 }
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53
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54 PyTypeObject PyTraceBack_Type = {
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55 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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56 "traceback",
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57 sizeof(PyTracebackObject),
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58 0,
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59 (destructor)tb_dealloc, /*tp_dealloc*/
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60 0, /*tp_print*/
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61 (getattrfunc)tb_getattr, /*tp_getattr*/
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62 0, /*tp_setattr*/
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63 0, /*tp_compare*/
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64 0, /*tp_repr*/
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65 0, /*tp_as_number*/
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66 0, /*tp_as_sequence*/
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67 0, /*tp_as_mapping*/
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68 0, /* tp_hash */
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69 0, /* tp_call */
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70 0, /* tp_str */
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71 0, /* tp_getattro */
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72 0, /* tp_setattro */
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73 0, /* tp_as_buffer */
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74 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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75 0, /* tp_doc */
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76 (traverseproc)tb_traverse, /* tp_traverse */
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77 (inquiry)tb_clear, /* tp_clear */
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78 0, /* tp_richcompare */
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79 0, /* tp_weaklistoffset */
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80 0, /* tp_iter */
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81 0, /* tp_iternext */
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82 0, /* tp_methods */
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83 0, /* tp_members */
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84 0, /* tp_getset */
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85 0, /* tp_base */
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86 0, /* tp_dict */
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87 };
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89 static PyTracebackObject *
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90 newtracebackobject(PyTracebackObject *next, PyFrameObject *frame)
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91 {
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92 PyTracebackObject *tb;
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93 if ((next != NULL && !PyTraceBack_Check(next)) ||
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94 frame == NULL || !PyFrame_Check(frame)) {
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95 PyErr_BadInternalCall();
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96 return NULL;
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97 }
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98 tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type);
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99 if (tb != NULL) {
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100 Py_XINCREF(next);
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101 tb->tb_next = next;
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102 Py_XINCREF(frame);
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103 tb->tb_frame = frame;
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104 tb->tb_lasti = frame->f_lasti;
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105 tb->tb_lineno = PyCode_Addr2Line(frame->f_code,
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106 frame->f_lasti);
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107 PyObject_GC_Track(tb);
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108 }
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109 return tb;
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110 }
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112 int
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113 PyTraceBack_Here(PyFrameObject *frame)
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114 {
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115 PyThreadState *tstate = PyThreadState_GET();
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116 PyTracebackObject *oldtb = (PyTracebackObject *) tstate->curexc_traceback;
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117 PyTracebackObject *tb = newtracebackobject(oldtb, frame);
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118 if (tb == NULL)
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119 return -1;
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120 tstate->curexc_traceback = (PyObject *)tb;
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121 Py_XDECREF(oldtb);
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122 return 0;
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123 }
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124
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125 int
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126 Py_DisplaySourceLine(PyObject *f, const char *filename, int lineno)
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127 {
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128 int err = 0;
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129 FILE *xfp = NULL;
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130 char linebuf[2000];
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131 int i;
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132 char namebuf[MAXPATHLEN+1];
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133
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134 if (filename == NULL)
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135 return -1;
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136 /* This is needed by Emacs' compile command */
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137 #define FMT " File \"%.500s\", line %d, in %.500s\n"
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138 xfp = fopen(filename, "r" PY_STDIOTEXTMODE);
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139 if (xfp == NULL) {
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140 /* Search tail of filename in sys.path before giving up */
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141 PyObject *path;
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142 const char *tail = strrchr(filename, SEP);
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143 if (tail == NULL)
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144 tail = filename;
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145 else
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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146 tail++;
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147 path = PySys_GetObject("path");
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148 if (path != NULL && PyList_Check(path)) {
36521
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
149 Py_ssize_t _npath = PyList_Size(path);
30aef3ce2b26 Use Py_ssize_t to count the
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150 int npath = Py_SAFE_DOWNCAST(_npath, Py_ssize_t, int);
13096
8c8de5b736dc Trent Mick's Win64 changes: size_t vs. int or long; also some overflow
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151 size_t taillen = strlen(tail);
674
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152 for (i = 0; i < npath; i++) {
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153 PyObject *v = PyList_GetItem(path, i);
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154 if (v == NULL) {
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155 PyErr_Clear();
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156 break;
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157 }
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158 if (PyString_Check(v)) {
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159 size_t len;
37086
3b7b295cca90 Use macro versions instead of function versions when we already know the type.
Neal Norwitz <nnorwitz@gmail.com>
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diff changeset
160 len = PyString_GET_SIZE(v);
1909
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161 if (len + 1 + taillen >= MAXPATHLEN)
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162 continue; /* Too long */
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163 strcpy(namebuf, PyString_AsString(v));
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164 if (strlen(namebuf) != len)
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165 continue; /* v contains '\0' */
674
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166 if (len > 0 && namebuf[len-1] != SEP)
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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167 namebuf[len++] = SEP;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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168 strcpy(namebuf+len, tail);
23029
8291473fde3e Mass checkin of universal newline support.
Jack Jansen <jack.jansen@cwi.nl>
parents: 22650
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169 xfp = fopen(namebuf, "r" PY_STDIOTEXTMODE);
674
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170 if (xfp != NULL) {
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171 filename = namebuf;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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172 break;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
parents: 597
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173 }
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
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174 }
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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175 }
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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176 }
86
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177 }
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178
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179 if (xfp == NULL)
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180 return err;
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181 if (err != 0) {
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182 fclose(xfp);
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183 return err;
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184 }
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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185
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186 for (i = 0; i < lineno; i++) {
11294
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
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parents: 5608
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187 char* pLastChar = &linebuf[sizeof(linebuf)-2];
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
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188 do {
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
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189 *pLastChar = '\0';
23029
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Jack Jansen <jack.jansen@cwi.nl>
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diff changeset
190 if (Py_UniversalNewlineFgets(linebuf, sizeof linebuf, xfp, NULL) == NULL)
11294
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
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diff changeset
191 break;
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
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diff changeset
192 /* fgets read *something*; if it didn't get as
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
parents: 5608
diff changeset
193 far as pLastChar, it must have found a newline
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
parents: 5608
diff changeset
194 or hit the end of the file; if pLastChar is \n,
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
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diff changeset
195 it obviously found a newline; else we haven't
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
parents: 5608
diff changeset
196 yet seen a newline, so must continue */
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
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diff changeset
197 } while (*pLastChar != '\0' && *pLastChar != '\n');
86
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198 }
a6934380c6e7 "Compiling" version
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diff changeset
199 if (i == lineno) {
674
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200 char *p = linebuf;
2811
07fc4fefb683 ignore control-l (parallelling change to tokenizer.c)
Guido van Rossum <guido@python.org>
parents: 2062
diff changeset
201 while (*p == ' ' || *p == '\t' || *p == '\014')
86
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202 p++;
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203 err = PyFile_WriteString(p, f);
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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diff changeset
204 if (err == 0 && strchr(p, '\n') == NULL)
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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diff changeset
205 err = PyFile_WriteString("\n", f);
86
a6934380c6e7 "Compiling" version
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206 }
a6934380c6e7 "Compiling" version
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207 fclose(xfp);
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diff changeset
208 return err;
86
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209 }
a6934380c6e7 "Compiling" version
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diff changeset
210
5608
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diff changeset
211 static int
46414
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diff changeset
212 tb_displayline(PyObject *f, const char *filename, int lineno, const char *name)
86
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213 {
5608
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diff changeset
214 int err = 0;
46414
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diff changeset
215 char linebuf[2000];
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
216
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
217 if (filename == NULL || name == NULL)
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
Brett Cannon <bcannon@gmail.com>
parents: 44739
diff changeset
218 return -1;
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
219 /* This is needed by Emacs' compile command */
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
220 #define FMT " File \"%.500s\", line %d, in %.500s\n"
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
Brett Cannon <bcannon@gmail.com>
parents: 44739
diff changeset
221 PyOS_snprintf(linebuf, sizeof(linebuf), FMT, filename, lineno, name);
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
222 err = PyFile_WriteString(linebuf, f);
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
223 if (err != 0)
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
224 return err;
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
225
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
226 err = PyFile_WriteString(" ", f);
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
227 return Py_DisplaySourceLine(f, filename, lineno);
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
228 }
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
229
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
230 static int
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
231 tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
Brett Cannon <bcannon@gmail.com>
parents: 44739
diff changeset
232 {
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
Brett Cannon <bcannon@gmail.com>
parents: 44739
diff changeset
233 int err = 0;
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
Brett Cannon <bcannon@gmail.com>
parents: 44739
diff changeset
234 long depth = 0;
31739
49ec0d8f08ec Moved tracebackobject to traceback.h, Closes SF Bug #497067
Nicholas Bastin <nick.bastin@gmail.com>
parents: 30968
diff changeset
235 PyTracebackObject *tb1 = tb;
1425
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
236 while (tb1 != NULL) {
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
237 depth++;
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
238 tb1 = tb1->tb_next;
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
239 }
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
240 while (tb != NULL && err == 0) {
5046
658815230546 Get the line number from PyCode_Addr2Line instead of believing
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
241 if (depth <= limit) {
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
242 err = tb_displayline(f,
5372
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parents: 5317
diff changeset
243 PyString_AsString(
424922afc1bb Quickly renamed.
Guido van Rossum <guido@python.org>
parents: 5317
diff changeset
244 tb->tb_frame->f_code->co_filename),
1831
216b755515e6 add function name to traceback info
Guido van Rossum <guido@python.org>
parents: 1425
diff changeset
245 tb->tb_lineno,
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parents: 5317
diff changeset
246 PyString_AsString(tb->tb_frame->f_code->co_name));
5046
658815230546 Get the line number from PyCode_Addr2Line instead of believing
Guido van Rossum <guido@python.org>
parents: 4503
diff changeset
247 }
1425
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
248 depth--;
86
a6934380c6e7 "Compiling" version
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parents:
diff changeset
249 tb = tb->tb_next;
5608
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Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
250 if (err == 0)
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
251 err = PyErr_CheckSignals();
86
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
252 }
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
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diff changeset
253 return err;
86
a6934380c6e7 "Compiling" version
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parents:
diff changeset
254 }
a6934380c6e7 "Compiling" version
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parents:
diff changeset
255
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
256 int
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
257 PyTraceBack_Print(PyObject *v, PyObject *f)
86
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
258 {
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
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parents: 5405
diff changeset
259 int err;
5372
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parents: 5317
diff changeset
260 PyObject *limitv;
46414
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parents: 44739
diff changeset
261 long limit = 1000;
86
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
262 if (v == NULL)
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
263 return 0;
20618
57b51966a4f1 Removed two pointless and obfuscating macros.
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
264 if (!PyTraceBack_Check(v)) {
5372
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parents: 5317
diff changeset
265 PyErr_BadInternalCall();
86
a6934380c6e7 "Compiling" version
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diff changeset
266 return -1;
a6934380c6e7 "Compiling" version
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parents:
diff changeset
267 }
5372
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parents: 5317
diff changeset
268 limitv = PySys_GetObject("tracebacklimit");
424922afc1bb Quickly renamed.
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parents: 5317
diff changeset
269 if (limitv && PyInt_Check(limitv)) {
424922afc1bb Quickly renamed.
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parents: 5317
diff changeset
270 limit = PyInt_AsLong(limitv);
1425
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
271 if (limit <= 0)
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
272 return 0;
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
273 }
12137
5b5581af951c Change traceback error message to "most recent call last" from
Guido van Rossum <guido@python.org>
parents: 11999
diff changeset
274 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
275 if (!err)
31739
49ec0d8f08ec Moved tracebackobject to traceback.h, Closes SF Bug #497067
Nicholas Bastin <nick.bastin@gmail.com>
parents: 30968
diff changeset
276 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
277 return err;
86
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
278 }