Mercurial > cpython-lru_cache-weakref

annotate Python/traceback.c @ 31606:fd2103ae6f29 legacy-trunk

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Add pystack definition to Misc/gdbinit with some explanation of its behavior and add flag comments to ceval.c and main.c alerting people to the coupling between pystack and the layout of those files.
author Skip Montanaro <skip@pobox.com>
date Mon, 01 Mar 2004 15:44:05 +0000
parents b6c139544c16
children 49ec0d8f08ec
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 "compile.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
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11 typedef struct _tracebackobject {
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12 PyObject_HEAD
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13 struct _tracebackobject *tb_next;
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14 PyFrameObject *tb_frame;
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15 int tb_lasti;
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16 int tb_lineno;
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17 } tracebackobject;
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18
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19 #define OFF(x) offsetof(tracebackobject, x)
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20
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21 static struct memberlist tb_memberlist[] = {
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22 {"tb_next", T_OBJECT, OFF(tb_next)},
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23 {"tb_frame", T_OBJECT, OFF(tb_frame)},
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24 {"tb_lasti", T_INT, OFF(tb_lasti)},
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25 {"tb_lineno", T_INT, OFF(tb_lineno)},
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26 {NULL} /* Sentinel */
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27 };
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29 static PyObject *
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30 tb_getattr(tracebackobject *tb, char *name)
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31 {
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32 return PyMember_Get((char *)tb, tb_memberlist, name);
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33 }
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35 static void
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36 tb_dealloc(tracebackobject *tb)
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37 {
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38 PyObject_GC_UnTrack(tb);
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39 Py_TRASHCAN_SAFE_BEGIN(tb)
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40 Py_XDECREF(tb->tb_next);
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41 Py_XDECREF(tb->tb_frame);
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42 PyObject_GC_Del(tb);
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43 Py_TRASHCAN_SAFE_END(tb)
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44 }
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45
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46 static int
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47 tb_traverse(tracebackobject *tb, visitproc visit, void *arg)
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48 {
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49 int err = 0;
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50 if (tb->tb_next) {
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51 err = visit((PyObject *)tb->tb_next, arg);
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52 if (err)
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53 return err;
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54 }
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55 if (tb->tb_frame)
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56 err = visit((PyObject *)tb->tb_frame, arg);
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57 return err;
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58 }
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59
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60 static void
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61 tb_clear(tracebackobject *tb)
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62 {
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63 Py_XDECREF(tb->tb_next);
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64 Py_XDECREF(tb->tb_frame);
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65 tb->tb_next = NULL;
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66 tb->tb_frame = NULL;
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67 }
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68
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69 PyTypeObject PyTraceBack_Type = {
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70 PyObject_HEAD_INIT(&PyType_Type)
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71 0,
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72 "traceback",
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73 sizeof(tracebackobject),
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74 0,
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75 (destructor)tb_dealloc, /*tp_dealloc*/
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76 0, /*tp_print*/
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77 (getattrfunc)tb_getattr, /*tp_getattr*/
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78 0, /*tp_setattr*/
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79 0, /*tp_compare*/
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80 0, /*tp_repr*/
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81 0, /*tp_as_number*/
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82 0, /*tp_as_sequence*/
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83 0, /*tp_as_mapping*/
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84 0, /* tp_hash */
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85 0, /* tp_call */
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86 0, /* tp_str */
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87 0, /* tp_getattro */
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88 0, /* tp_setattro */
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89 0, /* tp_as_buffer */
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90 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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91 0, /* tp_doc */
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92 (traverseproc)tb_traverse, /* tp_traverse */
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93 (inquiry)tb_clear, /* tp_clear */
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94 0, /* tp_richcompare */
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95 0, /* tp_weaklistoffset */
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96 0, /* tp_iter */
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97 0, /* tp_iternext */
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98 0, /* tp_methods */
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99 0, /* tp_members */
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100 0, /* tp_getset */
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101 0, /* tp_base */
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102 0, /* tp_dict */
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103 };
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104
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105 static tracebackobject *
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106 newtracebackobject(tracebackobject *next, PyFrameObject *frame)
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107 {
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108 tracebackobject *tb;
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109 if ((next != NULL && !PyTraceBack_Check(next)) ||
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110 frame == NULL || !PyFrame_Check(frame)) {
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111 PyErr_BadInternalCall();
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112 return NULL;
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113 }
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114 tb = PyObject_GC_New(tracebackobject, &PyTraceBack_Type);
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115 if (tb != NULL) {
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116 Py_XINCREF(next);
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117 tb->tb_next = next;
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118 Py_XINCREF(frame);
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119 tb->tb_frame = frame;
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120 tb->tb_lasti = frame->f_lasti;
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121 tb->tb_lineno = PyCode_Addr2Line(frame->f_code,
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122 frame->f_lasti);
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123 PyObject_GC_Track(tb);
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124 }
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125 return tb;
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126 }
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127
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128 int
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129 PyTraceBack_Here(PyFrameObject *frame)
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130 {
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131 PyThreadState *tstate = frame->f_tstate;
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132 tracebackobject *oldtb = (tracebackobject *) tstate->curexc_traceback;
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133 tracebackobject *tb = newtracebackobject(oldtb, frame);
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134 if (tb == NULL)
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135 return -1;
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136 tstate->curexc_traceback = (PyObject *)tb;
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137 Py_XDECREF(oldtb);
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138 return 0;
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139 }
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140
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141 static int
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142 tb_displayline(PyObject *f, char *filename, int lineno, char *name)
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143 {
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144 int err = 0;
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145 FILE *xfp;
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146 char linebuf[2000];
86
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147 int i;
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148 if (filename == NULL || name == NULL)
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
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149 return -1;
1831
216b755515e6 add function name to traceback info
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150 /* This is needed by Emacs' compile command */
21057
2c0a9a5086e1 SF bug 485175: buffer overflow in traceback.c.
Tim Peters <tim.peters@gmail.com>
parents: 20623
diff changeset
151 #define FMT " File \"%.500s\", line %d, in %.500s\n"
23029
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152 xfp = fopen(filename, "r" PY_STDIOTEXTMODE);
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153 if (xfp == NULL) {
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154 /* Search tail of filename in sys.path before giving up */
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155 PyObject *path;
674
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156 char *tail = strrchr(filename, SEP);
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157 if (tail == NULL)
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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158 tail = filename;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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159 else
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160 tail++;
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161 path = PySys_GetObject("path");
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162 if (path != NULL && PyList_Check(path)) {
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163 int npath = PyList_Size(path);
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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164 size_t taillen = strlen(tail);
674
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165 char namebuf[MAXPATHLEN+1];
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166 for (i = 0; i < npath; i++) {
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167 PyObject *v = PyList_GetItem(path, i);
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168 if (v == NULL) {
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Guido van Rossum <guido@python.org>
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169 PyErr_Clear();
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170 break;
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171 }
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172 if (PyString_Check(v)) {
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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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173 size_t len;
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174 len = PyString_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
175 if (len + 1 + taillen >= MAXPATHLEN)
0c232194a64f * Python/traceback.c: security fix -- check for buffer oveflow
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176 continue; /* Too long */
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177 strcpy(namebuf, PyString_AsString(v));
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Guido van Rossum <guido@python.org>
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178 if (strlen(namebuf) != len)
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179 continue; /* v contains '\0' */
674
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180 if (len > 0 && namebuf[len-1] != SEP)
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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181 namebuf[len++] = SEP;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
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182 strcpy(namebuf+len, tail);
23029
8291473fde3e Mass checkin of universal newline support.
Jack Jansen <jack.jansen@cwi.nl>
parents: 22650
diff changeset
183 xfp = fopen(namebuf, "r" PY_STDIOTEXTMODE);
674
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
parents: 597
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184 if (xfp != NULL) {
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
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diff changeset
185 filename = namebuf;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
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186 break;
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
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187 }
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
parents: 597
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188 }
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
parents: 597
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189 }
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
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190 }
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191 }
21077
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21057
diff changeset
192 PyOS_snprintf(linebuf, sizeof(linebuf), FMT, filename, lineno, name);
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
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193 err = PyFile_WriteString(linebuf, f);
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Guido van Rossum <guido@python.org>
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diff changeset
194 if (xfp == NULL || err != 0)
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
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diff changeset
195 return err;
86
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196 for (i = 0; i < lineno; i++) {
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
197 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
198 do {
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
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diff changeset
199 *pLastChar = '\0';
23029
8291473fde3e Mass checkin of universal newline support.
Jack Jansen <jack.jansen@cwi.nl>
parents: 22650
diff changeset
200 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
201 break;
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
parents: 5608
diff changeset
202 /* 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
203 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
204 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
205 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
206 yet seen a newline, so must continue */
d3696bf08eee Tim Peters fixed PR#75: very long lines cause incorrect tracebacks.
Guido van Rossum <guido@python.org>
parents: 5608
diff changeset
207 } while (*pLastChar != '\0' && *pLastChar != '\n');
86
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208 }
a6934380c6e7 "Compiling" version
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diff changeset
209 if (i == lineno) {
674
4e2d239dc64c Move printing of filename and lineno to tb_displayline.
Guido van Rossum <guido@python.org>
parents: 597
diff changeset
210 char *p = linebuf;
2811
07fc4fefb683 ignore control-l (parallelling change to tokenizer.c)
Guido van Rossum <guido@python.org>
parents: 2062
diff changeset
211 while (*p == ' ' || *p == '\t' || *p == '\014')
86
a6934380c6e7 "Compiling" version
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diff changeset
212 p++;
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
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diff changeset
213 err = PyFile_WriteString(" ", f);
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
214 if (err == 0) {
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
215 err = PyFile_WriteString(p, f);
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
216 if (err == 0 && strchr(p, '\n') == NULL)
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
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diff changeset
217 err = PyFile_WriteString("\n", f);
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
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diff changeset
218 }
86
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diff changeset
219 }
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
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220 fclose(xfp);
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
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diff changeset
221 return err;
86
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diff changeset
222 }
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
223
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
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diff changeset
224 static int
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
225 tb_printinternal(tracebackobject *tb, PyObject *f, int limit)
86
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diff changeset
226 {
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
227 int err = 0;
1425
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
228 int depth = 0;
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
229 tracebackobject *tb1 = tb;
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
230 while (tb1 != NULL) {
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
231 depth++;
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
232 tb1 = tb1->tb_next;
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
233 }
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
234 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
235 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
236 err = tb_displayline(f,
5372
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parents: 5317
diff changeset
237 PyString_AsString(
424922afc1bb Quickly renamed.
Guido van Rossum <guido@python.org>
parents: 5317
diff changeset
238 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
239 tb->tb_lineno,
5372
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parents: 5317
diff changeset
240 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
241 }
1425
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
242 depth--;
86
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243 tb = tb->tb_next;
5608
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Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
244 if (err == 0)
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
245 err = PyErr_CheckSignals();
86
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parents:
diff changeset
246 }
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
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diff changeset
247 return err;
86
a6934380c6e7 "Compiling" version
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parents:
diff changeset
248 }
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
249
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
250 int
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
251 PyTraceBack_Print(PyObject *v, PyObject *f)
86
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parents:
diff changeset
252 {
5608
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
253 int err;
5372
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parents: 5317
diff changeset
254 PyObject *limitv;
1425
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
255 int limit = 1000;
86
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Guido van Rossum <guido@python.org>
parents:
diff changeset
256 if (v == NULL)
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents:
diff changeset
257 return 0;
20618
57b51966a4f1 Removed two pointless and obfuscating macros.
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
258 if (!PyTraceBack_Check(v)) {
5372
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diff changeset
259 PyErr_BadInternalCall();
86
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260 return -1;
a6934380c6e7 "Compiling" version
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parents:
diff changeset
261 }
5372
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diff changeset
262 limitv = PySys_GetObject("tracebacklimit");
424922afc1bb Quickly renamed.
Guido van Rossum <guido@python.org>
parents: 5317
diff changeset
263 if (limitv && PyInt_Check(limitv)) {
424922afc1bb Quickly renamed.
Guido van Rossum <guido@python.org>
parents: 5317
diff changeset
264 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
265 if (limit <= 0)
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
266 return 0;
72bddfad351a * mpzmodule.c: cast some methods to the proper type.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
267 }
12137
5b5581af951c Change traceback error message to "most recent call last" from
Guido van Rossum <guido@python.org>
parents: 11999
diff changeset
268 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
269 if (!err)
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
270 err = tb_printinternal((tracebackobject *)v, f, limit);
79e49cbce2ef PyFile_WriteString now returns an error indicator instead of calling
Guido van Rossum <guido@python.org>
parents: 5405
diff changeset
271 return err;
86
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parents:
diff changeset
272 }