annotate Python/traceback.c @ 57367:ed30bcffa146 legacy-trunk

improve several corner cases related with argument names in parenthesis - Fix #7362: give a good error message for parenthesized arguments with defaults. - Add a py3k warning for any parenthesized arguments since those are not allowed in Py3. This warning is not given in tuple unpacking, since that incurs the tuple unpacking warning.
author Benjamin Peterson <benjamin@python.org>
date Thu, 19 Nov 2009 22:54:57 +0000
parents 8f6cf39c96dd
children 8e3b5fbc1e41
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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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12 #define OFF(x) offsetof(PyTracebackObject, x)
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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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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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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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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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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;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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diff changeset
138 else
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diff changeset
139 tail++;
5372
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140 path = PySys_GetObject("path");
424922afc1bb Quickly renamed.
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parents: 5317
diff changeset
141 if (path != NULL && PyList_Check(path)) {
36521
30aef3ce2b26 Use Py_ssize_t to count the
Martin v. Löwis <martin@v.loewis.de>
parents: 35742
diff changeset
142 Py_ssize_t _npath = PyList_Size(path);
30aef3ce2b26 Use Py_ssize_t to count the
Martin v. Löwis <martin@v.loewis.de>
parents: 35742
diff changeset
143 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
Guido van Rossum <guido@python.org>
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diff changeset
144 size_t taillen = strlen(tail);
674
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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145 for (i = 0; i < npath; i++) {
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diff changeset
146 PyObject *v = PyList_GetItem(path, i);
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diff changeset
147 if (v == NULL) {
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diff changeset
148 PyErr_Clear();
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diff changeset
149 break;
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diff changeset
150 }
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Gregory P. Smith <greg@mad-scientist.com>
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diff changeset
151 if (PyString_Check(v)) {
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Guido van Rossum <guido@python.org>
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diff changeset
152 size_t len;
47527
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Gregory P. Smith <greg@mad-scientist.com>
parents: 47294
diff changeset
153 len = PyString_GET_SIZE(v);
1909
0c232194a64f * Python/traceback.c: security fix -- check for buffer oveflow
Guido van Rossum <guido@python.org>
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diff changeset
154 if (len + 1 + taillen >= MAXPATHLEN)
0c232194a64f * Python/traceback.c: security fix -- check for buffer oveflow
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diff changeset
155 continue; /* Too long */
47527
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Gregory P. Smith <greg@mad-scientist.com>
parents: 47294
diff changeset
156 strcpy(namebuf, PyString_AsString(v));
13096
8c8de5b736dc Trent Mick's Win64 changes: size_t vs. int or long; also some overflow
Guido van Rossum <guido@python.org>
parents: 12576
diff changeset
157 if (strlen(namebuf) != len)
1909
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Guido van Rossum <guido@python.org>
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diff changeset
158 continue; /* v contains '\0' */
674
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diff changeset
159 if (len > 0 && namebuf[len-1] != SEP)
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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diff changeset
160 namebuf[len++] = SEP;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
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diff changeset
161 strcpy(namebuf+len, tail);
23029
8291473fde3e Mass checkin of universal newline support.
Jack Jansen <jack.jansen@cwi.nl>
parents: 22650
diff changeset
162 xfp = fopen(namebuf, "r" PY_STDIOTEXTMODE);
674
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diff changeset
163 if (xfp != NULL) {
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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diff changeset
164 filename = namebuf;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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diff changeset
165 break;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
parents: 597
diff changeset
166 }
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
parents: 597
diff changeset
167 }
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
parents: 597
diff changeset
168 }
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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169 }
86
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170 }
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171
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
172 if (xfp == NULL)
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parents: 44739
diff changeset
173 return err;
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
174 if (err != 0) {
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diff changeset
175 fclose(xfp);
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176 return err;
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
177 }
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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178
86
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179 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
diff changeset
180 char* pLastChar = &linebuf[sizeof(linebuf)-2];
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
parents: 5608
diff changeset
181 do {
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
parents: 5608
diff changeset
182 *pLastChar = '\0';
23029
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Jack Jansen <jack.jansen@cwi.nl>
parents: 22650
diff changeset
183 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>
parents: 5608
diff changeset
184 break;
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
parents: 5608
diff changeset
185 /* 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
186 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
187 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>
parents: 5608
diff changeset
188 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
189 yet seen a newline, so must continue */
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
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parents: 5608
diff changeset
190 } while (*pLastChar != '\0' && *pLastChar != '\n');
86
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191 }
a6934380c6e7 "Compiling" version
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diff changeset
192 if (i == lineno) {
47933
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Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
193 char buf[11];
674
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diff changeset
194 char *p = linebuf;
2811
07fc4fefb683 ignore control-l (parallelling change to tokenizer.c)
Guido van Rossum <guido@python.org>
parents: 2062
diff changeset
195 while (*p == ' ' || *p == '\t' || *p == '\014')
86
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196 p++;
47933
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diff changeset
197
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
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parents: 47527
diff changeset
198 /* Write some spaces before the line */
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
199 strcpy(buf, " ");
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
200 assert (strlen(buf) == 10);
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
201 while (indent > 0) {
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
202 if(indent < 10)
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
203 buf[indent] = '\0';
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
204 err = PyFile_WriteString(buf, f);
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
205 if (err != 0)
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
206 break;
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
207 indent -= 10;
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
208 }
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
209
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
210 if (err == 0)
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
211 err = PyFile_WriteString(p, f);
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 47527
diff changeset
212 if (err == 0 && strchr(p, '\n') == NULL)
4f804ee772eb #3342: In tracebacks, printed source lines were not indented since r62555.
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parents: 47527
diff changeset
213 err = PyFile_WriteString("\n", f);
86
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214 }
a6934380c6e7 "Compiling" version
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diff changeset
215 fclose(xfp);
5608
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diff changeset
216 return err;
86
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parents:
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217 }
a6934380c6e7 "Compiling" version
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parents:
diff changeset
218
5608
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diff changeset
219 static int
46414
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parents: 44739
diff changeset
220 tb_displayline(PyObject *f, const char *filename, int lineno, const char *name)
86
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221 {
5608
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diff changeset
222 int err = 0;
46414
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diff changeset
223 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
224
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
225 if (filename == NULL || name == NULL)
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
226 return -1;
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
227 /* 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
228 #define FMT " File \"%.500s\", line %d, in %.500s\n"
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
229 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
230 err = PyFile_WriteString(linebuf, f);
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parents: 44739
diff changeset
231 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
232 return err;
47933
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parents: 47527
diff changeset
233 return _Py_DisplaySourceLine(f, filename, lineno, 4);
46414
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parents: 44739
diff changeset
234 }
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
235
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
236 static int
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
237 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
238 {
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
239 int err = 0;
840064802952 Re-implement the 'warnings' module in C. This allows for usage of the
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parents: 44739
diff changeset
240 long depth = 0;
31739
49ec0d8f08ec Moved tracebackobject to traceback.h, Closes SF Bug #497067
Nicholas Bastin <nick.bastin@gmail.com>
parents: 30968
diff changeset
241 PyTracebackObject *tb1 = tb;
1425
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
242 while (tb1 != NULL) {
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
243 depth++;
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
244 tb1 = tb1->tb_next;
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
245 }
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
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parents: 5405
diff changeset
246 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
247 if (depth <= limit) {
55901
8f6cf39c96dd revert unintended changes
Benjamin Peterson <benjamin@python.org>
parents: 55900
diff changeset
248 err = tb_displayline(f,
8f6cf39c96dd revert unintended changes
Benjamin Peterson <benjamin@python.org>
parents: 55900
diff changeset
249 PyString_AsString(
8f6cf39c96dd revert unintended changes
Benjamin Peterson <benjamin@python.org>
parents: 55900
diff changeset
250 tb->tb_frame->f_code->co_filename),
8f6cf39c96dd revert unintended changes
Benjamin Peterson <benjamin@python.org>
parents: 55900
diff changeset
251 tb->tb_lineno,
8f6cf39c96dd revert unintended changes
Benjamin Peterson <benjamin@python.org>
parents: 55900
diff changeset
252 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
253 }
1425
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
254 depth--;
86
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diff changeset
255 tb = tb->tb_next;
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
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diff changeset
256 if (err == 0)
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
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parents: 5405
diff changeset
257 err = PyErr_CheckSignals();
86
a6934380c6e7 "Compiling" version
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diff changeset
258 }
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
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diff changeset
259 return err;
86
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parents:
diff changeset
260 }
a6934380c6e7 "Compiling" version
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parents:
diff changeset
261
a6934380c6e7 "Compiling" version
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parents:
diff changeset
262 int
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
263 PyTraceBack_Print(PyObject *v, PyObject *f)
86
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parents:
diff changeset
264 {
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
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diff changeset
265 int err;
5372
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Guido van Rossum <guido@python.org>
parents: 5317
diff changeset
266 PyObject *limitv;
46414
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diff changeset
267 long limit = 1000;
86
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diff changeset
268 if (v == NULL)
a6934380c6e7 "Compiling" version
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parents:
diff changeset
269 return 0;
20618
57b51966a4f1 Removed two pointless and obfuscating macros.
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
270 if (!PyTraceBack_Check(v)) {
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Guido van Rossum <guido@python.org>
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271 PyErr_BadInternalCall();
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272 return -1;
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273 }
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274 limitv = PySys_GetObject("tracebacklimit");
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275 if (limitv && PyInt_Check(limitv)) {
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276 limit = PyInt_AsLong(limitv);
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Guido van Rossum <guido@python.org>
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277 if (limit <= 0)
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278 return 0;
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Guido van Rossum <guido@python.org>
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279 }
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Guido van Rossum <guido@python.org>
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280 err = PyFile_WriteString("Traceback (most recent call last):\n", f);
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281 if (!err)
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Nicholas Bastin <nick.bastin@gmail.com>
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282 err = tb_printinternal((PyTracebackObject *)v, f, limit);
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283 return err;
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284 }