source: python/trunk/Python/traceback.c@ 389

Last change on this file since 389 was 10, checked in by Yuri Dario, 15 years ago

python: merged offline changes.
  • Property svn:eol-style set to native
File size: 6.7 KB
Line 
1
2/* Traceback implementation */
3
4#include "Python.h"
5
6#include "code.h"
7#include "frameobject.h"
8#include "structmember.h"
9#include "osdefs.h"
10#include "traceback.h"
11
12#define OFF(x) offsetof(PyTracebackObject, x)
13
14static PyMemberDef tb_memberlist[] = {
15 {"tb_next", T_OBJECT, OFF(tb_next), READONLY},
16 {"tb_frame", T_OBJECT, OFF(tb_frame), READONLY},
17 {"tb_lasti", T_INT, OFF(tb_lasti), READONLY},
18 {"tb_lineno", T_INT, OFF(tb_lineno), READONLY},
19 {NULL} /* Sentinel */
20};
21
22static void
23tb_dealloc(PyTracebackObject *tb)
24{
25 PyObject_GC_UnTrack(tb);
26 Py_TRASHCAN_SAFE_BEGIN(tb)
27 Py_XDECREF(tb->tb_next);
28 Py_XDECREF(tb->tb_frame);
29 PyObject_GC_Del(tb);
30 Py_TRASHCAN_SAFE_END(tb)
31}
32
33static int
34tb_traverse(PyTracebackObject *tb, visitproc visit, void *arg)
35{
36 Py_VISIT(tb->tb_next);
37 Py_VISIT(tb->tb_frame);
38 return 0;
39}
40
41static void
42tb_clear(PyTracebackObject *tb)
43{
44 Py_CLEAR(tb->tb_next);
45 Py_CLEAR(tb->tb_frame);
46}
47
48PyTypeObject PyTraceBack_Type = {
49 PyVarObject_HEAD_INIT(&PyType_Type, 0)
50 "traceback",
51 sizeof(PyTracebackObject),
52 0,
53 (destructor)tb_dealloc, /*tp_dealloc*/
54 0, /*tp_print*/
55 0, /*tp_getattr*/
56 0, /*tp_setattr*/
57 0, /*tp_compare*/
58 0, /*tp_repr*/
59 0, /*tp_as_number*/
60 0, /*tp_as_sequence*/
61 0, /*tp_as_mapping*/
62 0, /* tp_hash */
63 0, /* tp_call */
64 0, /* tp_str */
65 0, /* tp_getattro */
66 0, /* tp_setattro */
67 0, /* tp_as_buffer */
68 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
69 0, /* tp_doc */
70 (traverseproc)tb_traverse, /* tp_traverse */
71 (inquiry)tb_clear, /* tp_clear */
72 0, /* tp_richcompare */
73 0, /* tp_weaklistoffset */
74 0, /* tp_iter */
75 0, /* tp_iternext */
76 0, /* tp_methods */
77 tb_memberlist, /* tp_members */
78 0, /* tp_getset */
79 0, /* tp_base */
80 0, /* tp_dict */
81};
82
83static PyTracebackObject *
84newtracebackobject(PyTracebackObject *next, PyFrameObject *frame)
85{
86 PyTracebackObject *tb;
87 if ((next != NULL && !PyTraceBack_Check(next)) ||
88 frame == NULL || !PyFrame_Check(frame)) {
89 PyErr_BadInternalCall();
90 return NULL;
91 }
92 tb = PyObject_GC_New(PyTracebackObject, &PyTraceBack_Type);
93 if (tb != NULL) {
94 Py_XINCREF(next);
95 tb->tb_next = next;
96 Py_XINCREF(frame);
97 tb->tb_frame = frame;
98 tb->tb_lasti = frame->f_lasti;
99 tb->tb_lineno = PyCode_Addr2Line(frame->f_code,
100 frame->f_lasti);
101 PyObject_GC_Track(tb);
102 }
103 return tb;
104}
105
106int
107PyTraceBack_Here(PyFrameObject *frame)
108{
109 PyThreadState *tstate = PyThreadState_GET();
110 PyTracebackObject *oldtb = (PyTracebackObject *) tstate->curexc_traceback;
111 PyTracebackObject *tb = newtracebackobject(oldtb, frame);
112 if (tb == NULL)
113 return -1;
114 tstate->curexc_traceback = (PyObject *)tb;
115 Py_XDECREF(oldtb);
116 return 0;
117}
118
119int
120_Py_DisplaySourceLine(PyObject *f, const char *filename, int lineno, int indent)
121{
122 int err = 0;
123 FILE *xfp = NULL;
124 char linebuf[2000];
125 int i;
126 char namebuf[MAXPATHLEN+1];
127
128 if (filename == NULL)
129 return -1;
130 /* This is needed by Emacs' compile command */
131#define FMT " File \"%.500s\", line %d, in %.500s\n"
132 xfp = fopen(filename, "r" PY_STDIOTEXTMODE);
133 if (xfp == NULL) {
134 /* Search tail of filename in sys.path before giving up */
135 PyObject *path;
136 const char *tail = strrchr(filename, SEP);
137 if (tail == NULL)
138 tail = filename;
139 else
140 tail++;
141 path = PySys_GetObject("path");
142 if (path != NULL && PyList_Check(path)) {
143 Py_ssize_t _npath = PyList_Size(path);
144 int npath = Py_SAFE_DOWNCAST(_npath, Py_ssize_t, int);
145 size_t taillen = strlen(tail);
146 for (i = 0; i < npath; i++) {
147 PyObject *v = PyList_GetItem(path, i);
148 if (v == NULL) {
149 PyErr_Clear();
150 break;
151 }
152 if (PyString_Check(v)) {
153 size_t len;
154 len = PyString_GET_SIZE(v);
155 if (len + 1 + taillen >= MAXPATHLEN)
156 continue; /* Too long */
157 strcpy(namebuf, PyString_AsString(v));
158 if (strlen(namebuf) != len)
159 continue; /* v contains '\0' */
160 if (len > 0 && IS_SEP(namebuf[len-1]))
161 namebuf[len++] = SEP;
162 strcpy(namebuf+len, tail);
163 xfp = fopen(namebuf, "r" PY_STDIOTEXTMODE);
164 if (xfp != NULL) {
165 filename = namebuf;
166 break;
167 }
168 }
169 }
170 }
171 }
172
173 if (xfp == NULL)
174 return err;
175 if (err != 0) {
176 fclose(xfp);
177 return err;
178 }
179
180 for (i = 0; i < lineno; i++) {
181 char* pLastChar = &linebuf[sizeof(linebuf)-2];
182 do {
183 *pLastChar = '\0';
184 if (Py_UniversalNewlineFgets(linebuf, sizeof linebuf, xfp, NULL) == NULL)
185 break;
186 /* fgets read *something*; if it didn't get as
187 far as pLastChar, it must have found a newline
188 or hit the end of the file; if pLastChar is \n,
189 it obviously found a newline; else we haven't
190 yet seen a newline, so must continue */
191 } while (*pLastChar != '\0' && *pLastChar != '\n');
192 }
193 if (i == lineno) {
194 char buf[11];
195 char *p = linebuf;
196 while (*p == ' ' || *p == '\t' || *p == '\014')
197 p++;
198
199 /* Write some spaces before the line */
200 strcpy(buf, " ");
201 assert (strlen(buf) == 10);
202 while (indent > 0) {
203 if(indent < 10)
204 buf[indent] = '\0';
205 err = PyFile_WriteString(buf, f);
206 if (err != 0)
207 break;
208 indent -= 10;
209 }
210
211 if (err == 0)
212 err = PyFile_WriteString(p, f);
213 if (err == 0 && strchr(p, '\n') == NULL)
214 err = PyFile_WriteString("\n", f);
215 }
216 fclose(xfp);
217 return err;
218}
219
220static int
221tb_displayline(PyObject *f, const char *filename, int lineno, const char *name)
222{
223 int err = 0;
224 char linebuf[2000];
225
226 if (filename == NULL || name == NULL)
227 return -1;
228 /* This is needed by Emacs' compile command */
229#define FMT " File \"%.500s\", line %d, in %.500s\n"
230 PyOS_snprintf(linebuf, sizeof(linebuf), FMT, filename, lineno, name);
231 err = PyFile_WriteString(linebuf, f);
232 if (err != 0)
233 return err;
234 return _Py_DisplaySourceLine(f, filename, lineno, 4);
235}
236
237static int
238tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
239{
240 int err = 0;
241 long depth = 0;
242 PyTracebackObject *tb1 = tb;
243 while (tb1 != NULL) {
244 depth++;
245 tb1 = tb1->tb_next;
246 }
247 while (tb != NULL && err == 0) {
248 if (depth <= limit) {
249 err = tb_displayline(f,
250 PyString_AsString(
251 tb->tb_frame->f_code->co_filename),
252 tb->tb_lineno,
253 PyString_AsString(tb->tb_frame->f_code->co_name));
254 }
255 depth--;
256 tb = tb->tb_next;
257 if (err == 0)
258 err = PyErr_CheckSignals();
259 }
260 return err;
261}
262
263int
264PyTraceBack_Print(PyObject *v, PyObject *f)
265{
266 int err;
267 PyObject *limitv;
268 long limit = 1000;
269 if (v == NULL)
270 return 0;
271 if (!PyTraceBack_Check(v)) {
272 PyErr_BadInternalCall();
273 return -1;
274 }
275 limitv = PySys_GetObject("tracebacklimit");
276 if (limitv && PyInt_Check(limitv)) {
277 limit = PyInt_AsLong(limitv);
278 if (limit <= 0)
279 return 0;
280 }
281 err = PyFile_WriteString("Traceback (most recent call last):\n", f);
282 if (!err)
283 err = tb_printinternal((PyTracebackObject *)v, f, limit);
284 return err;
285}
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