Mercurial > cpython-lru_cache-weakref
annotate Python/traceback.c @ 16845:09dcf5ebcd80 legacy-trunk
Now that Jeremy is asking about this code, it looks really bogus to me,
so let's rip it out. The constructor for SyntaxError does the right
thing, so we do not need to do it again.
| author | Fred Drake <fdrake@acm.org> |
|---|---|
| date | Wed, 28 Feb 2001 20:58:04 +0000 |
| parents | 6f6f965c5e2d |
| children | 82ac83474462 57b51966a4f1 |
| rev | line source |
|---|---|
| 145 | 1 |
| 86 | 2 /* Traceback implementation */ |
| 3 | |
| 5372 | 4 #include "Python.h" |
| 86 | 5 |
| 6 #include "compile.h" | |
| 7 #include "frameobject.h" | |
| 8 #include "structmember.h" | |
|
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9 #include "osdefs.h" |
| 86 | 10 |
| 11 typedef struct _tracebackobject { | |
| 5372 | 12 PyObject_HEAD |
| 86 | 13 struct _tracebackobject *tb_next; |
| 5372 | 14 PyFrameObject *tb_frame; |
| 86 | 15 int tb_lasti; |
| 16 int tb_lineno; | |
| 17 } tracebackobject; | |
| 18 | |
| 19 #define OFF(x) offsetof(tracebackobject, x) | |
| 20 | |
| 21 static struct memberlist tb_memberlist[] = { | |
| 22 {"tb_next", T_OBJECT, OFF(tb_next)}, | |
| 23 {"tb_frame", T_OBJECT, OFF(tb_frame)}, | |
| 24 {"tb_lasti", T_INT, OFF(tb_lasti)}, | |
| 25 {"tb_lineno", T_INT, OFF(tb_lineno)}, | |
| 26 {NULL} /* Sentinel */ | |
| 27 }; | |
| 28 | |
| 5372 | 29 static PyObject * |
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30 tb_getattr(tracebackobject *tb, char *name) |
| 86 | 31 { |
| 5372 | 32 return PyMember_Get((char *)tb, tb_memberlist, name); |
| 86 | 33 } |
| 34 | |
| 35 static void | |
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36 tb_dealloc(tracebackobject *tb) |
| 86 | 37 { |
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38 Py_TRASHCAN_SAFE_BEGIN(tb) |
| 5372 | 39 Py_XDECREF(tb->tb_next); |
| 40 Py_XDECREF(tb->tb_frame); | |
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41 PyObject_DEL(tb); |
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42 Py_TRASHCAN_SAFE_END(tb) |
| 86 | 43 } |
| 44 | |
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45 #define Tracebacktype PyTraceBack_Type |
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46 #define is_tracebackobject PyTraceBack_Check |
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47 |
| 5372 | 48 PyTypeObject Tracebacktype = { |
| 49 PyObject_HEAD_INIT(&PyType_Type) | |
| 86 | 50 0, |
| 51 "traceback", | |
| 52 sizeof(tracebackobject), | |
| 53 0, | |
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54 (destructor)tb_dealloc, /*tp_dealloc*/ |
| 86 | 55 0, /*tp_print*/ |
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56 (getattrfunc)tb_getattr, /*tp_getattr*/ |
| 86 | 57 0, /*tp_setattr*/ |
| 58 0, /*tp_compare*/ | |
| 59 0, /*tp_repr*/ | |
| 60 0, /*tp_as_number*/ | |
| 61 0, /*tp_as_sequence*/ | |
| 62 0, /*tp_as_mapping*/ | |
| 63 }; | |
| 64 | |
| 65 static tracebackobject * | |
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66 newtracebackobject(tracebackobject *next, PyFrameObject *frame, int lasti, |
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67 int lineno) |
| 86 | 68 { |
| 69 tracebackobject *tb; | |
| 70 if ((next != NULL && !is_tracebackobject(next)) || | |
| 5372 | 71 frame == NULL || !PyFrame_Check(frame)) { |
| 72 PyErr_BadInternalCall(); | |
| 86 | 73 return NULL; |
| 74 } | |
| 5372 | 75 tb = PyObject_NEW(tracebackobject, &Tracebacktype); |
| 86 | 76 if (tb != NULL) { |
| 5372 | 77 Py_XINCREF(next); |
| 86 | 78 tb->tb_next = next; |
| 5372 | 79 Py_XINCREF(frame); |
| 86 | 80 tb->tb_frame = frame; |
| 81 tb->tb_lasti = lasti; | |
| 82 tb->tb_lineno = lineno; | |
| 83 } | |
| 84 return tb; | |
| 85 } | |
| 86 | |
| 87 int | |
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88 PyTraceBack_Here(PyFrameObject *frame) |
| 86 | 89 { |
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90 PyThreadState *tstate = frame->f_tstate; |
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91 tracebackobject *oldtb = (tracebackobject *) tstate->curexc_traceback; |
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92 tracebackobject *tb = newtracebackobject(oldtb, |
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93 frame, frame->f_lasti, frame->f_lineno); |
| 86 | 94 if (tb == NULL) |
| 95 return -1; | |
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96 tstate->curexc_traceback = (PyObject *)tb; |
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97 Py_XDECREF(oldtb); |
| 86 | 98 return 0; |
| 99 } | |
| 100 | |
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101 static int |
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102 tb_displayline(PyObject *f, char *filename, int lineno, char *name) |
| 86 | 103 { |
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104 int err = 0; |
| 86 | 105 FILE *xfp; |
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106 char linebuf[1000]; |
| 86 | 107 int i; |
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108 if (filename == NULL || name == NULL) |
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109 return -1; |
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110 #ifdef MPW |
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111 /* This is needed by MPW's File and Line commands */ |
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112 #define FMT " File \"%.900s\"; line %d # in %s\n" |
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113 #else |
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114 /* This is needed by Emacs' compile command */ |
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115 #define FMT " File \"%.900s\", line %d, in %s\n" |
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116 #endif |
| 86 | 117 xfp = fopen(filename, "r"); |
| 118 if (xfp == NULL) { | |
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119 /* Search tail of filename in sys.path before giving up */ |
| 5372 | 120 PyObject *path; |
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121 char *tail = strrchr(filename, SEP); |
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122 if (tail == NULL) |
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123 tail = filename; |
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124 else |
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125 tail++; |
| 5372 | 126 path = PySys_GetObject("path"); |
| 127 if (path != NULL && PyList_Check(path)) { | |
| 128 int npath = PyList_Size(path); | |
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129 size_t taillen = strlen(tail); |
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130 char namebuf[MAXPATHLEN+1]; |
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131 for (i = 0; i < npath; i++) { |
| 5372 | 132 PyObject *v = PyList_GetItem(path, i); |
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133 if (v == NULL) { |
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134 PyErr_Clear(); |
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135 break; |
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136 } |
| 5372 | 137 if (PyString_Check(v)) { |
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138 size_t len; |
| 5372 | 139 len = PyString_Size(v); |
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140 if (len + 1 + taillen >= MAXPATHLEN) |
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141 continue; /* Too long */ |
| 5372 | 142 strcpy(namebuf, PyString_AsString(v)); |
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143 if (strlen(namebuf) != len) |
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144 continue; /* v contains '\0' */ |
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145 if (len > 0 && namebuf[len-1] != SEP) |
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146 namebuf[len++] = SEP; |
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147 strcpy(namebuf+len, tail); |
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148 xfp = fopen(namebuf, "r"); |
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149 if (xfp != NULL) { |
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150 filename = namebuf; |
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151 break; |
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152 } |
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153 } |
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154 } |
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155 } |
| 86 | 156 } |
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157 sprintf(linebuf, FMT, filename, lineno, name); |
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158 err = PyFile_WriteString(linebuf, f); |
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159 if (xfp == NULL || err != 0) |
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160 return err; |
| 86 | 161 for (i = 0; i < lineno; i++) { |
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162 char* pLastChar = &linebuf[sizeof(linebuf)-2]; |
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163 do { |
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164 *pLastChar = '\0'; |
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165 if (fgets(linebuf, sizeof linebuf, xfp) == NULL) |
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166 break; |
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167 /* fgets read *something*; if it didn't get as |
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168 far as pLastChar, it must have found a newline |
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169 or hit the end of the file; if pLastChar is \n, |
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170 it obviously found a newline; else we haven't |
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171 yet seen a newline, so must continue */ |
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172 } while (*pLastChar != '\0' && *pLastChar != '\n'); |
| 86 | 173 } |
| 174 if (i == lineno) { | |
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175 char *p = linebuf; |
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176 while (*p == ' ' || *p == '\t' || *p == '\014') |
| 86 | 177 p++; |
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178 err = PyFile_WriteString(" ", f); |
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179 if (err == 0) { |
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180 err = PyFile_WriteString(p, f); |
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181 if (err == 0 && strchr(p, '\n') == NULL) |
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182 err = PyFile_WriteString("\n", f); |
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183 } |
| 86 | 184 } |
| 185 fclose(xfp); | |
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186 return err; |
| 86 | 187 } |
| 188 | |
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189 static int |
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190 tb_printinternal(tracebackobject *tb, PyObject *f, int limit) |
| 86 | 191 { |
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192 int err = 0; |
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193 int depth = 0; |
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194 tracebackobject *tb1 = tb; |
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195 while (tb1 != NULL) { |
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196 depth++; |
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197 tb1 = tb1->tb_next; |
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198 } |
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199 while (tb != NULL && err == 0) { |
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200 if (depth <= limit) { |
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201 if (Py_OptimizeFlag) |
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202 tb->tb_lineno = PyCode_Addr2Line( |
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203 tb->tb_frame->f_code, tb->tb_lasti); |
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204 err = tb_displayline(f, |
| 5372 | 205 PyString_AsString( |
| 206 tb->tb_frame->f_code->co_filename), | |
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207 tb->tb_lineno, |
| 5372 | 208 PyString_AsString(tb->tb_frame->f_code->co_name)); |
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209 } |
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210 depth--; |
| 86 | 211 tb = tb->tb_next; |
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212 if (err == 0) |
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213 err = PyErr_CheckSignals(); |
| 86 | 214 } |
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215 return err; |
| 86 | 216 } |
| 217 | |
| 218 int | |
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219 PyTraceBack_Print(PyObject *v, PyObject *f) |
| 86 | 220 { |
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221 int err; |
| 5372 | 222 PyObject *limitv; |
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223 int limit = 1000; |
| 86 | 224 if (v == NULL) |
| 225 return 0; | |
| 226 if (!is_tracebackobject(v)) { | |
| 5372 | 227 PyErr_BadInternalCall(); |
| 86 | 228 return -1; |
| 229 } | |
| 5372 | 230 limitv = PySys_GetObject("tracebacklimit"); |
| 231 if (limitv && PyInt_Check(limitv)) { | |
| 232 limit = PyInt_AsLong(limitv); | |
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233 if (limit <= 0) |
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234 return 0; |
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235 } |
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236 err = PyFile_WriteString("Traceback (most recent call last):\n", f); |
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237 if (!err) |
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238 err = tb_printinternal((tracebackobject *)v, f, limit); |
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239 return err; |
| 86 | 240 } |