source: python/trunk/Python/traceback.c@ 1538

Last change on this file since 1538 was 391, checked in by dmik, 12 years ago

python: Merge vendor 2.7.6 to trunk.
  • Property svn:eol-style set to native
File size: 8.5 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 = PyFrame_GetLineNumber(frame);
100 PyObject_GC_Track(tb);
101 }
102 return tb;
103}
104
105int
106PyTraceBack_Here(PyFrameObject *frame)
107{
108 PyThreadState *tstate = PyThreadState_GET();
109 PyTracebackObject *oldtb = (PyTracebackObject *) tstate->curexc_traceback;
110 PyTracebackObject *tb = newtracebackobject(oldtb, frame);
111 if (tb == NULL)
112 return -1;
113 tstate->curexc_traceback = (PyObject *)tb;
114 Py_XDECREF(oldtb);
115 return 0;
116}
117
118int
119_Py_DisplaySourceLine(PyObject *f, const char *filename, int lineno, int indent)
120{
121 int err = 0;
122 FILE *xfp = NULL;
123 char linebuf[2000];
124 int i;
125 char namebuf[MAXPATHLEN+1];
126
127 if (filename == NULL)
128 return -1;
129 /* This is needed by Emacs' compile command */
130#define FMT " File \"%.500s\", line %d, in %.500s\n"
131 xfp = fopen(filename, "r" PY_STDIOTEXTMODE);
132 if (xfp == NULL) {
133 /* Search tail of filename in sys.path before giving up */
134 PyObject *path;
135 const char *tail = strrchr(filename, SEP);
136 if (tail == NULL)
137 tail = filename;
138 else
139 tail++;
140 path = PySys_GetObject("path");
141 if (path != NULL && PyList_Check(path)) {
142 Py_ssize_t _npath = PyList_Size(path);
143 int npath = Py_SAFE_DOWNCAST(_npath, Py_ssize_t, int);
144 size_t taillen = strlen(tail);
145 for (i = 0; i < npath; i++) {
146 PyObject *v = PyList_GetItem(path, i);
147 if (v == NULL) {
148 PyErr_Clear();
149 break;
150 }
151 if (PyString_Check(v)) {
152 size_t len;
153 len = PyString_GET_SIZE(v);
154 if (len + 1 + taillen >= MAXPATHLEN)
155 continue; /* Too long */
156 strcpy(namebuf, PyString_AsString(v));
157 if (strlen(namebuf) != len)
158 continue; /* v contains '\0' */
159 if (len > 0 && !IS_SEP(namebuf[len-1]))
160 namebuf[len++] = SEP;
161 strcpy(namebuf+len, tail);
162 xfp = fopen(namebuf, "r" PY_STDIOTEXTMODE);
163 if (xfp != NULL) {
164 break;
165 }
166 }
167 }
168 }
169 }
170
171 if (xfp == NULL)
172 return err;
173 if (err != 0) {
174 fclose(xfp);
175 return err;
176 }
177
178 for (i = 0; i < lineno; i++) {
179 char* pLastChar = &linebuf[sizeof(linebuf)-2];
180 do {
181 *pLastChar = '\0';
182 if (Py_UniversalNewlineFgets(linebuf, sizeof linebuf, xfp, NULL) == NULL)
183 break;
184 /* fgets read *something*; if it didn't get as
185 far as pLastChar, it must have found a newline
186 or hit the end of the file; if pLastChar is \n,
187 it obviously found a newline; else we haven't
188 yet seen a newline, so must continue */
189 } while (*pLastChar != '\0' && *pLastChar != '\n');
190 }
191 if (i == lineno) {
192 char buf[11];
193 char *p = linebuf;
194 while (*p == ' ' || *p == '\t' || *p == '\014')
195 p++;
196
197 /* Write some spaces before the line */
198 strcpy(buf, " ");
199 assert (strlen(buf) == 10);
200 while (indent > 0) {
201 if(indent < 10)
202 buf[indent] = '\0';
203 err = PyFile_WriteString(buf, f);
204 if (err != 0)
205 break;
206 indent -= 10;
207 }
208
209 if (err == 0)
210 err = PyFile_WriteString(p, f);
211 if (err == 0 && strchr(p, '\n') == NULL)
212 err = PyFile_WriteString("\n", f);
213 }
214 fclose(xfp);
215 return err;
216}
217
218static int
219tb_displayline(PyObject *f, const char *filename, int lineno, const char *name)
220{
221 int err = 0;
222 char linebuf[2000];
223
224 if (filename == NULL || name == NULL)
225 return -1;
226 /* This is needed by Emacs' compile command */
227#define FMT " File \"%.500s\", line %d, in %.500s\n"
228 PyOS_snprintf(linebuf, sizeof(linebuf), FMT, filename, lineno, name);
229 err = PyFile_WriteString(linebuf, f);
230 if (err != 0)
231 return err;
232 return _Py_DisplaySourceLine(f, filename, lineno, 4);
233}
234
235static int
236tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
237{
238 int err = 0;
239 long depth = 0;
240 PyTracebackObject *tb1 = tb;
241 while (tb1 != NULL) {
242 depth++;
243 tb1 = tb1->tb_next;
244 }
245 while (tb != NULL && err == 0) {
246 if (depth <= limit) {
247 err = tb_displayline(f,
248 PyString_AsString(
249 tb->tb_frame->f_code->co_filename),
250 tb->tb_lineno,
251 PyString_AsString(tb->tb_frame->f_code->co_name));
252 }
253 depth--;
254 tb = tb->tb_next;
255 if (err == 0)
256 err = PyErr_CheckSignals();
257 }
258 return err;
259}
260
261int
262PyTraceBack_Print(PyObject *v, PyObject *f)
263{
264 int err;
265 PyObject *limitv;
266 long limit = 1000;
267 if (v == NULL)
268 return 0;
269 if (!PyTraceBack_Check(v)) {
270 PyErr_BadInternalCall();
271 return -1;
272 }
273 limitv = PySys_GetObject("tracebacklimit");
274 if (limitv && PyInt_Check(limitv)) {
275 limit = PyInt_AsLong(limitv);
276 if (limit <= 0)
277 return 0;
278 }
279 err = PyFile_WriteString("Traceback (most recent call last):\n", f);
280 if (!err)
281 err = tb_printinternal((PyTracebackObject *)v, f, limit);
282 return err;
283}
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