forked from python/cpython
-
Notifications
You must be signed in to change notification settings - Fork 28
Expand file tree
/
Copy patherrors.c
More file actions
2004 lines (1758 loc) · 54.8 KB
/
errors.c
File metadata and controls
2004 lines (1758 loc) · 54.8 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* Error handling */
#include "Python.h"
#include "pycore_call.h" // _PyObject_CallNoArgs()
#include "pycore_initconfig.h" // _PyStatus_ERR()
#include "pycore_pyerrors.h" // _PyErr_Format()
#include "pycore_pystate.h" // _PyThreadState_GET()
#include "pycore_structseq.h" // _PyStructSequence_FiniBuiltin()
#include "pycore_sysmodule.h" // _PySys_Audit()
#include "pycore_traceback.h" // _PyTraceBack_FromFrame()
#ifdef MS_WINDOWS
# include <windows.h>
# include <winbase.h>
# include <stdlib.h> // _sys_nerr
#endif
/* Forward declarations */
static PyObject *
_PyErr_FormatV(PyThreadState *tstate, PyObject *exception,
const char *format, va_list vargs);
void
_PyErr_SetRaisedException(PyThreadState *tstate, PyObject *exc)
{
PyObject *old_exc = tstate->current_exception;
tstate->current_exception = exc;
Py_XDECREF(old_exc);
}
static PyObject*
_PyErr_CreateException(PyObject *exception_type, PyObject *value)
{
PyObject *exc;
if (value == NULL || value == Py_None) {
exc = _PyObject_CallNoArgs(exception_type);
}
else if (PyTuple_Check(value)) {
exc = PyObject_Call(exception_type, value, NULL);
}
else {
exc = PyObject_CallOneArg(exception_type, value);
}
if (exc != NULL && !PyExceptionInstance_Check(exc)) {
PyErr_Format(PyExc_TypeError,
"calling %R should have returned an instance of "
"BaseException, not %s",
exception_type, Py_TYPE(exc)->tp_name);
Py_CLEAR(exc);
}
return exc;
}
void
_PyErr_Restore(PyThreadState *tstate, PyObject *type, PyObject *value,
PyObject *traceback)
{
if (type == NULL) {
assert(value == NULL);
assert(traceback == NULL);
_PyErr_SetRaisedException(tstate, NULL);
return;
}
assert(PyExceptionClass_Check(type));
if (value != NULL && type == (PyObject *)Py_TYPE(value)) {
/* Already normalized */
assert(((PyBaseExceptionObject *)value)->traceback != Py_None);
}
else {
PyObject *exc = _PyErr_CreateException(type, value);
Py_XDECREF(value);
if (exc == NULL) {
Py_DECREF(type);
Py_XDECREF(traceback);
return;
}
value = exc;
}
assert(PyExceptionInstance_Check(value));
if (traceback != NULL && !PyTraceBack_Check(traceback)) {
if (traceback == Py_None) {
Py_DECREF(Py_None);
traceback = NULL;
}
else {
PyErr_SetString(PyExc_TypeError, "traceback must be a Traceback or None");
Py_XDECREF(value);
Py_DECREF(type);
Py_XDECREF(traceback);
return;
}
}
PyObject *old_traceback = ((PyBaseExceptionObject *)value)->traceback;
((PyBaseExceptionObject *)value)->traceback = traceback;
Py_XDECREF(old_traceback);
_PyErr_SetRaisedException(tstate, value);
Py_DECREF(type);
}
void
PyErr_Restore(PyObject *type, PyObject *value, PyObject *traceback)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_Restore(tstate, type, value, traceback);
}
void
PyErr_SetRaisedException(PyObject *exc)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_SetRaisedException(tstate, exc);
}
_PyErr_StackItem *
_PyErr_GetTopmostException(PyThreadState *tstate)
{
_PyErr_StackItem *exc_info = tstate->exc_info;
assert(exc_info);
while (exc_info->exc_value == NULL && exc_info->previous_item != NULL)
{
exc_info = exc_info->previous_item;
}
assert(!Py_IsNone(exc_info->exc_value));
return exc_info;
}
static PyObject *
get_normalization_failure_note(PyThreadState *tstate, PyObject *exception, PyObject *value)
{
PyObject *args = PyObject_Repr(value);
if (args == NULL) {
_PyErr_Clear(tstate);
args = PyUnicode_FromFormat("<unknown>");
}
PyObject *note;
const char *tpname = ((PyTypeObject*)exception)->tp_name;
if (args == NULL) {
_PyErr_Clear(tstate);
note = PyUnicode_FromFormat("Normalization failed: type=%s", tpname);
}
else {
note = PyUnicode_FromFormat("Normalization failed: type=%s args=%S",
tpname, args);
Py_DECREF(args);
}
return note;
}
void
_PyErr_SetObject(PyThreadState *tstate, PyObject *exception, PyObject *value)
{
PyObject *exc_value;
PyObject *tb = NULL;
if (exception != NULL &&
!PyExceptionClass_Check(exception)) {
_PyErr_Format(tstate, PyExc_SystemError,
"_PyErr_SetObject: "
"exception %R is not a BaseException subclass",
exception);
return;
}
/* Normalize the exception */
int is_subclass = 0;
if (value != NULL && PyExceptionInstance_Check(value)) {
is_subclass = PyObject_IsSubclass((PyObject *)Py_TYPE(value), exception);
if (is_subclass < 0) {
return;
}
}
Py_XINCREF(value);
if (!is_subclass) {
/* We must normalize the value right now */
/* Issue #23571: functions must not be called with an
exception set */
_PyErr_Clear(tstate);
PyObject *fixed_value = _PyErr_CreateException(exception, value);
if (fixed_value == NULL) {
PyObject *exc = _PyErr_GetRaisedException(tstate);
assert(PyExceptionInstance_Check(exc));
PyObject *note = get_normalization_failure_note(tstate, exception, value);
Py_XDECREF(value);
if (note != NULL) {
/* ignore errors in _PyException_AddNote - they will be overwritten below */
_PyException_AddNote(exc, note);
Py_DECREF(note);
}
_PyErr_SetRaisedException(tstate, exc);
return;
}
Py_XSETREF(value, fixed_value);
}
exc_value = _PyErr_GetTopmostException(tstate)->exc_value;
if (exc_value != NULL && exc_value != Py_None) {
/* Implicit exception chaining */
Py_INCREF(exc_value);
/* Avoid creating new reference cycles through the
context chain, while taking care not to hang on
pre-existing ones.
This is O(chain length) but context chains are
usually very short. Sensitive readers may try
to inline the call to PyException_GetContext. */
if (exc_value != value) {
PyObject *o = exc_value, *context;
PyObject *slow_o = o; /* Floyd's cycle detection algo */
int slow_update_toggle = 0;
while ((context = PyException_GetContext(o))) {
Py_DECREF(context);
if (context == value) {
PyException_SetContext(o, NULL);
break;
}
o = context;
if (o == slow_o) {
/* pre-existing cycle - all exceptions on the
path were visited and checked. */
break;
}
if (slow_update_toggle) {
slow_o = PyException_GetContext(slow_o);
Py_DECREF(slow_o);
}
slow_update_toggle = !slow_update_toggle;
}
PyException_SetContext(value, exc_value);
}
else {
Py_DECREF(exc_value);
}
}
assert(value != NULL);
if (PyExceptionInstance_Check(value))
tb = PyException_GetTraceback(value);
_PyErr_Restore(tstate, Py_NewRef(Py_TYPE(value)), value, tb);
}
void
PyErr_SetObject(PyObject *exception, PyObject *value)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_SetObject(tstate, exception, value);
}
/* Set a key error with the specified argument, wrapping it in a
* tuple automatically so that tuple keys are not unpacked as the
* exception arguments. */
void
_PyErr_SetKeyError(PyObject *arg)
{
PyThreadState *tstate = _PyThreadState_GET();
PyObject *exc = PyObject_CallOneArg(PyExc_KeyError, arg);
if (!exc) {
/* caller will expect error to be set anyway */
return;
}
_PyErr_SetObject(tstate, (PyObject*)Py_TYPE(exc), exc);
Py_DECREF(exc);
}
void
_PyErr_SetNone(PyThreadState *tstate, PyObject *exception)
{
_PyErr_SetObject(tstate, exception, (PyObject *)NULL);
}
void
PyErr_SetNone(PyObject *exception)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_SetNone(tstate, exception);
}
void
_PyErr_SetString(PyThreadState *tstate, PyObject *exception,
const char *string)
{
PyObject *value = PyUnicode_FromString(string);
if (value != NULL) {
_PyErr_SetObject(tstate, exception, value);
Py_DECREF(value);
}
}
void
PyErr_SetString(PyObject *exception, const char *string)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_SetString(tstate, exception, string);
}
PyObject* _Py_HOT_FUNCTION
PyErr_Occurred(void)
{
/* The caller must hold the GIL. */
assert(PyGILState_Check());
PyThreadState *tstate = _PyThreadState_GET();
return _PyErr_Occurred(tstate);
}
int
PyErr_GivenExceptionMatches(PyObject *err, PyObject *exc)
{
if (err == NULL || exc == NULL) {
/* maybe caused by "import exceptions" that failed early on */
return 0;
}
if (PyTuple_Check(exc)) {
Py_ssize_t i, n;
n = PyTuple_Size(exc);
for (i = 0; i < n; i++) {
/* Test recursively */
if (PyErr_GivenExceptionMatches(
err, PyTuple_GET_ITEM(exc, i)))
{
return 1;
}
}
return 0;
}
/* err might be an instance, so check its class. */
if (PyExceptionInstance_Check(err))
err = PyExceptionInstance_Class(err);
if (PyExceptionClass_Check(err) && PyExceptionClass_Check(exc)) {
return PyType_IsSubtype((PyTypeObject *)err, (PyTypeObject *)exc);
}
return err == exc;
}
int
_PyErr_ExceptionMatches(PyThreadState *tstate, PyObject *exc)
{
return PyErr_GivenExceptionMatches(_PyErr_Occurred(tstate), exc);
}
int
PyErr_ExceptionMatches(PyObject *exc)
{
PyThreadState *tstate = _PyThreadState_GET();
return _PyErr_ExceptionMatches(tstate, exc);
}
#ifndef Py_NORMALIZE_RECURSION_LIMIT
#define Py_NORMALIZE_RECURSION_LIMIT 32
#endif
/* Used in many places to normalize a raised exception, including in
eval_code2(), do_raise(), and PyErr_Print()
XXX: should PyErr_NormalizeException() also call
PyException_SetTraceback() with the resulting value and tb?
*/
void
_PyErr_NormalizeException(PyThreadState *tstate, PyObject **exc,
PyObject **val, PyObject **tb)
{
int recursion_depth = 0;
tstate->recursion_headroom++;
PyObject *type, *value, *initial_tb;
restart:
type = *exc;
if (type == NULL) {
/* There was no exception, so nothing to do. */
tstate->recursion_headroom--;
return;
}
value = *val;
/* If PyErr_SetNone() was used, the value will have been actually
set to NULL.
*/
if (!value) {
value = Py_NewRef(Py_None);
}
/* Normalize the exception so that if the type is a class, the
value will be an instance.
*/
if (PyExceptionClass_Check(type)) {
PyObject *inclass = NULL;
int is_subclass = 0;
if (PyExceptionInstance_Check(value)) {
inclass = PyExceptionInstance_Class(value);
is_subclass = PyObject_IsSubclass(inclass, type);
if (is_subclass < 0) {
goto error;
}
}
/* If the value was not an instance, or is not an instance
whose class is (or is derived from) type, then use the
value as an argument to instantiation of the type
class.
*/
if (!is_subclass) {
PyObject *fixed_value = _PyErr_CreateException(type, value);
if (fixed_value == NULL) {
goto error;
}
Py_SETREF(value, fixed_value);
}
/* If the class of the instance doesn't exactly match the
class of the type, believe the instance.
*/
else if (inclass != type) {
Py_SETREF(type, Py_NewRef(inclass));
}
}
*exc = type;
*val = value;
tstate->recursion_headroom--;
return;
error:
Py_DECREF(type);
Py_DECREF(value);
recursion_depth++;
if (recursion_depth == Py_NORMALIZE_RECURSION_LIMIT) {
_PyErr_SetString(tstate, PyExc_RecursionError,
"maximum recursion depth exceeded "
"while normalizing an exception");
}
/* If the new exception doesn't set a traceback and the old
exception had a traceback, use the old traceback for the
new exception. It's better than nothing.
*/
initial_tb = *tb;
_PyErr_Fetch(tstate, exc, val, tb);
assert(*exc != NULL);
if (initial_tb != NULL) {
if (*tb == NULL)
*tb = initial_tb;
else
Py_DECREF(initial_tb);
}
/* Abort when Py_NORMALIZE_RECURSION_LIMIT has been exceeded, and the
corresponding RecursionError could not be normalized, and the
MemoryError raised when normalize this RecursionError could not be
normalized. */
if (recursion_depth >= Py_NORMALIZE_RECURSION_LIMIT + 2) {
if (PyErr_GivenExceptionMatches(*exc, PyExc_MemoryError)) {
Py_FatalError("Cannot recover from MemoryErrors "
"while normalizing exceptions.");
}
else {
Py_FatalError("Cannot recover from the recursive normalization "
"of an exception.");
}
}
goto restart;
}
void
PyErr_NormalizeException(PyObject **exc, PyObject **val, PyObject **tb)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_NormalizeException(tstate, exc, val, tb);
}
PyObject *
_PyErr_GetRaisedException(PyThreadState *tstate) {
PyObject *exc = tstate->current_exception;
tstate->current_exception = NULL;
return exc;
}
PyObject *
PyErr_GetRaisedException(void)
{
PyThreadState *tstate = _PyThreadState_GET();
return _PyErr_GetRaisedException(tstate);
}
void
_PyErr_Fetch(PyThreadState *tstate, PyObject **p_type, PyObject **p_value,
PyObject **p_traceback)
{
PyObject *exc = _PyErr_GetRaisedException(tstate);
*p_value = exc;
if (exc == NULL) {
*p_type = NULL;
*p_traceback = NULL;
}
else {
*p_type = Py_NewRef(Py_TYPE(exc));
*p_traceback = Py_XNewRef(((PyBaseExceptionObject *)exc)->traceback);
}
}
void
PyErr_Fetch(PyObject **p_type, PyObject **p_value, PyObject **p_traceback)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_Fetch(tstate, p_type, p_value, p_traceback);
}
void
_PyErr_Clear(PyThreadState *tstate)
{
_PyErr_Restore(tstate, NULL, NULL, NULL);
}
void
PyErr_Clear(void)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_Clear(tstate);
}
static PyObject*
get_exc_type(PyObject *exc_value) /* returns a borrowed ref */
{
if (exc_value == NULL || exc_value == Py_None) {
return Py_None;
}
else {
assert(PyExceptionInstance_Check(exc_value));
PyObject *type = PyExceptionInstance_Class(exc_value);
assert(type != NULL);
return type;
}
}
static PyObject*
get_exc_traceback(PyObject *exc_value) /* returns a borrowed ref */
{
if (exc_value == NULL || exc_value == Py_None) {
return Py_None;
}
else {
assert(PyExceptionInstance_Check(exc_value));
PyObject *tb = PyException_GetTraceback(exc_value);
Py_XDECREF(tb);
return tb ? tb : Py_None;
}
}
void
_PyErr_GetExcInfo(PyThreadState *tstate,
PyObject **p_type, PyObject **p_value, PyObject **p_traceback)
{
_PyErr_StackItem *exc_info = _PyErr_GetTopmostException(tstate);
*p_type = Py_XNewRef(get_exc_type(exc_info->exc_value));
*p_value = Py_XNewRef(exc_info->exc_value);
*p_traceback = Py_XNewRef(get_exc_traceback(exc_info->exc_value));
}
PyObject*
_PyErr_GetHandledException(PyThreadState *tstate)
{
_PyErr_StackItem *exc_info = _PyErr_GetTopmostException(tstate);
PyObject *exc = exc_info->exc_value;
if (exc == NULL || exc == Py_None) {
return NULL;
}
return Py_NewRef(exc);
}
PyObject*
PyErr_GetHandledException(void)
{
PyThreadState *tstate = _PyThreadState_GET();
return _PyErr_GetHandledException(tstate);
}
void
_PyErr_SetHandledException(PyThreadState *tstate, PyObject *exc)
{
Py_XSETREF(tstate->exc_info->exc_value, Py_XNewRef(exc == Py_None ? NULL : exc));
}
void
PyErr_SetHandledException(PyObject *exc)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_SetHandledException(tstate, exc);
}
void
PyErr_GetExcInfo(PyObject **p_type, PyObject **p_value, PyObject **p_traceback)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_GetExcInfo(tstate, p_type, p_value, p_traceback);
}
void
PyErr_SetExcInfo(PyObject *type, PyObject *value, PyObject *traceback)
{
PyErr_SetHandledException(value);
Py_XDECREF(value);
/* These args are no longer used, but we still need to steal a ref */
Py_XDECREF(type);
Py_XDECREF(traceback);
}
PyObject*
_PyErr_StackItemToExcInfoTuple(_PyErr_StackItem *err_info)
{
PyObject *exc_value = err_info->exc_value;
assert(exc_value == NULL ||
exc_value == Py_None ||
PyExceptionInstance_Check(exc_value));
PyObject *exc_type = get_exc_type(exc_value);
PyObject *exc_traceback = get_exc_traceback(exc_value);
return PyTuple_Pack(
3,
exc_type ? exc_type : Py_None,
exc_value ? exc_value : Py_None,
exc_traceback ? exc_traceback : Py_None);
}
/* Like PyErr_Restore(), but if an exception is already set,
set the context associated with it.
The caller is responsible for ensuring that this call won't create
any cycles in the exception context chain. */
void
_PyErr_ChainExceptions(PyObject *typ, PyObject *val, PyObject *tb)
{
if (typ == NULL)
return;
PyThreadState *tstate = _PyThreadState_GET();
if (!PyExceptionClass_Check(typ)) {
_PyErr_Format(tstate, PyExc_SystemError,
"_PyErr_ChainExceptions: "
"exception %R is not a BaseException subclass",
typ);
return;
}
if (_PyErr_Occurred(tstate)) {
_PyErr_NormalizeException(tstate, &typ, &val, &tb);
if (tb != NULL) {
PyException_SetTraceback(val, tb);
Py_DECREF(tb);
}
Py_DECREF(typ);
PyObject *exc2 = _PyErr_GetRaisedException(tstate);
PyException_SetContext(exc2, val);
_PyErr_SetRaisedException(tstate, exc2);
}
else {
_PyErr_Restore(tstate, typ, val, tb);
}
}
/* Like PyErr_SetRaisedException(), but if an exception is already set,
set the context associated with it.
The caller is responsible for ensuring that this call won't create
any cycles in the exception context chain. */
void
_PyErr_ChainExceptions1(PyObject *exc)
{
if (exc == NULL) {
return;
}
PyThreadState *tstate = _PyThreadState_GET();
if (_PyErr_Occurred(tstate)) {
PyObject *exc2 = _PyErr_GetRaisedException(tstate);
PyException_SetContext(exc2, exc);
_PyErr_SetRaisedException(tstate, exc2);
}
else {
_PyErr_SetRaisedException(tstate, exc);
}
}
/* If the current thread is handling an exception (exc_info is ), set this
exception as the context of the current raised exception.
This function can only be called when _PyErr_Occurred() is true.
Also, this function won't create any cycles in the exception context
chain to the extent that _PyErr_SetObject ensures this. */
void
_PyErr_ChainStackItem(void)
{
PyThreadState *tstate = _PyThreadState_GET();
assert(_PyErr_Occurred(tstate));
_PyErr_StackItem *exc_info = tstate->exc_info;
if (exc_info->exc_value == NULL || exc_info->exc_value == Py_None) {
return;
}
PyObject *exc = _PyErr_GetRaisedException(tstate);
/* _PyErr_SetObject sets the context from PyThreadState. */
_PyErr_SetObject(tstate, (PyObject *) Py_TYPE(exc), exc);
Py_DECREF(exc); // since _PyErr_Occurred was true
}
static PyObject *
_PyErr_FormatVFromCause(PyThreadState *tstate, PyObject *exception,
const char *format, va_list vargs)
{
assert(_PyErr_Occurred(tstate));
PyObject *exc = _PyErr_GetRaisedException(tstate);
assert(!_PyErr_Occurred(tstate));
_PyErr_FormatV(tstate, exception, format, vargs);
PyObject *exc2 = _PyErr_GetRaisedException(tstate);
PyException_SetCause(exc2, Py_NewRef(exc));
PyException_SetContext(exc2, Py_NewRef(exc));
Py_DECREF(exc);
_PyErr_SetRaisedException(tstate, exc2);
return NULL;
}
PyObject *
_PyErr_FormatFromCauseTstate(PyThreadState *tstate, PyObject *exception,
const char *format, ...)
{
va_list vargs;
va_start(vargs, format);
_PyErr_FormatVFromCause(tstate, exception, format, vargs);
va_end(vargs);
return NULL;
}
PyObject *
_PyErr_FormatFromCause(PyObject *exception, const char *format, ...)
{
PyThreadState *tstate = _PyThreadState_GET();
va_list vargs;
va_start(vargs, format);
_PyErr_FormatVFromCause(tstate, exception, format, vargs);
va_end(vargs);
return NULL;
}
/* Convenience functions to set a type error exception and return 0 */
int
PyErr_BadArgument(void)
{
PyThreadState *tstate = _PyThreadState_GET();
_PyErr_SetString(tstate, PyExc_TypeError,
"bad argument type for built-in operation");
return 0;
}
PyObject *
PyErr_NoMemory(void)
{
PyThreadState *tstate = _PyThreadState_GET();
return _PyErr_NoMemory(tstate);
}
PyObject *
PyErr_SetFromErrnoWithFilenameObject(PyObject *exc, PyObject *filenameObject)
{
return PyErr_SetFromErrnoWithFilenameObjects(exc, filenameObject, NULL);
}
PyObject *
PyErr_SetFromErrnoWithFilenameObjects(PyObject *exc, PyObject *filenameObject, PyObject *filenameObject2)
{
PyThreadState *tstate = _PyThreadState_GET();
PyObject *message;
PyObject *v, *args;
int i = errno;
#ifdef MS_WINDOWS
WCHAR *s_buf = NULL;
#endif /* Unix/Windows */
#ifdef EINTR
if (i == EINTR && PyErr_CheckSignals())
return NULL;
#endif
#ifndef MS_WINDOWS
if (i != 0) {
const char *s = strerror(i);
message = PyUnicode_DecodeLocale(s, "surrogateescape");
}
else {
/* Sometimes errno didn't get set */
message = PyUnicode_FromString("Error");
}
#else
if (i == 0)
message = PyUnicode_FromString("Error"); /* Sometimes errno didn't get set */
else
{
/* Note that the Win32 errors do not lineup with the
errno error. So if the error is in the MSVC error
table, we use it, otherwise we assume it really _is_
a Win32 error code
*/
if (i > 0 && i < _sys_nerr) {
message = PyUnicode_FromString(_sys_errlist[i]);
}
else {
int len = FormatMessageW(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, /* no message source */
i,
MAKELANGID(LANG_NEUTRAL,
SUBLANG_DEFAULT),
/* Default language */
(LPWSTR) &s_buf,
0, /* size not used */
NULL); /* no args */
if (len==0) {
/* Only ever seen this in out-of-mem
situations */
s_buf = NULL;
message = PyUnicode_FromFormat("Windows Error 0x%x", i);
} else {
/* remove trailing cr/lf and dots */
while (len > 0 && (s_buf[len-1] <= L' ' || s_buf[len-1] == L'.'))
s_buf[--len] = L'\0';
message = PyUnicode_FromWideChar(s_buf, len);
}
}
}
#endif /* Unix/Windows */
if (message == NULL)
{
#ifdef MS_WINDOWS
LocalFree(s_buf);
#endif
return NULL;
}
if (filenameObject != NULL) {
if (filenameObject2 != NULL)
args = Py_BuildValue("(iOOiO)", i, message, filenameObject, 0, filenameObject2);
else
args = Py_BuildValue("(iOO)", i, message, filenameObject);
} else {
assert(filenameObject2 == NULL);
args = Py_BuildValue("(iO)", i, message);
}
Py_DECREF(message);
if (args != NULL) {
v = PyObject_Call(exc, args, NULL);
Py_DECREF(args);
if (v != NULL) {
_PyErr_SetObject(tstate, (PyObject *) Py_TYPE(v), v);
Py_DECREF(v);
}
}
#ifdef MS_WINDOWS
LocalFree(s_buf);
#endif
return NULL;
}
PyObject *
PyErr_SetFromErrnoWithFilename(PyObject *exc, const char *filename)
{
PyObject *name = NULL;
if (filename) {
int i = errno;
name = PyUnicode_DecodeFSDefault(filename);
if (name == NULL) {
return NULL;
}
errno = i;
}
PyObject *result = PyErr_SetFromErrnoWithFilenameObjects(exc, name, NULL);
Py_XDECREF(name);
return result;
}
PyObject *
PyErr_SetFromErrno(PyObject *exc)
{
return PyErr_SetFromErrnoWithFilenameObjects(exc, NULL, NULL);
}
#ifdef MS_WINDOWS
/* Windows specific error code handling */
PyObject *PyErr_SetExcFromWindowsErrWithFilenameObject(
PyObject *exc,
int ierr,
PyObject *filenameObject)
{
return PyErr_SetExcFromWindowsErrWithFilenameObjects(exc, ierr,
filenameObject, NULL);
}
PyObject *PyErr_SetExcFromWindowsErrWithFilenameObjects(
PyObject *exc,
int ierr,
PyObject *filenameObject,
PyObject *filenameObject2)
{
PyThreadState *tstate = _PyThreadState_GET();
int len;
WCHAR *s_buf = NULL; /* Free via LocalFree */
PyObject *message;
PyObject *args, *v;
DWORD err = (DWORD)ierr;
if (err==0) {
err = GetLastError();
}
len = FormatMessageW(
/* Error API error */
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, /* no message source */
err,
MAKELANGID(LANG_NEUTRAL,
SUBLANG_DEFAULT), /* Default language */
(LPWSTR) &s_buf,
0, /* size not used */
NULL); /* no args */
if (len==0) {
/* Only seen this in out of mem situations */
message = PyUnicode_FromFormat("Windows Error 0x%x", err);
s_buf = NULL;
} else {
/* remove trailing cr/lf and dots */
while (len > 0 && (s_buf[len-1] <= L' ' || s_buf[len-1] == L'.'))
s_buf[--len] = L'\0';
message = PyUnicode_FromWideChar(s_buf, len);
}
if (message == NULL)
{
LocalFree(s_buf);
return NULL;
}
if (filenameObject == NULL) {
assert(filenameObject2 == NULL);
filenameObject = filenameObject2 = Py_None;
}
else if (filenameObject2 == NULL)
filenameObject2 = Py_None;
/* This is the constructor signature for OSError.
The POSIX translation will be figured out by the constructor. */
args = Py_BuildValue("(iOOiO)", 0, message, filenameObject, err, filenameObject2);
Py_DECREF(message);
if (args != NULL) {
v = PyObject_Call(exc, args, NULL);
Py_DECREF(args);
if (v != NULL) {
_PyErr_SetObject(tstate, (PyObject *) Py_TYPE(v), v);
Py_DECREF(v);
}
}
LocalFree(s_buf);
return NULL;
}
PyObject *PyErr_SetExcFromWindowsErrWithFilename(
PyObject *exc,
int ierr,
const char *filename)
{
PyObject *name = NULL;
if (filename) {
if ((DWORD)ierr == 0) {
ierr = (int)GetLastError();
}