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1 #include "Python.h"
2 #include "frameobject.h"
3
4 #define MODULE_NAME "_warnings"
5
6 PyDoc_STRVAR(warnings__doc__,
7 MODULE_NAME " provides basic warning filtering support.\n"
8 "It is a helper module to speed up interpreter start-up.");
9
10 /* Both 'filters' and 'onceregistry' can be set in warnings.py;
11 get_warnings_attr() will reset these variables accordingly. */
12 static PyObject *_filters; /* List */
13 static PyObject *_once_registry; /* Dict */
14 static PyObject *_default_action; /* String */
15
16
17 static int
18 check_matched(PyObject *obj, PyObject *arg)
19 {
20 PyObject *result;
21 int rc;
22
23 if (obj == Py_None)
24 return 1;
25 result = PyObject_CallMethod(obj, "match", "O", arg);
26 if (result == NULL)
27 return -1;
28
29 rc = PyObject_IsTrue(result);
30 Py_DECREF(result);
31 return rc;
32 }
33
34 /*
35 Returns a new reference.
36 A NULL return value can mean false or an error.
37 */
38 static PyObject *
39 get_warnings_attr(const char *attr)
40 {
41 static PyObject *warnings_str = NULL;
42 PyObject *all_modules;
43 PyObject *warnings_module;
44 int result;
45
46 if (warnings_str == NULL) {
47 warnings_str = PyString_InternFromString("warnings");
48 if (warnings_str == NULL)
49 return NULL;
50 }
51
52 all_modules = PyImport_GetModuleDict();
53 result = PyDict_Contains(all_modules, warnings_str);
54 if (result == -1 || result == 0)
55 return NULL;
56
57 warnings_module = PyDict_GetItem(all_modules, warnings_str);
58 if (!PyObject_HasAttrString(warnings_module, attr))
59 return NULL;
60 return PyObject_GetAttrString(warnings_module, attr);
61 }
62
63
64 static PyObject *
65 get_once_registry(void)
66 {
67 PyObject *registry;
68
69 registry = get_warnings_attr("onceregistry");
70 if (registry == NULL) {
71 if (PyErr_Occurred())
72 return NULL;
73 return _once_registry;
74 }
75 Py_DECREF(_once_registry);
76 _once_registry = registry;
77 return registry;
78 }
79
80
81 static PyObject *
82 get_default_action(void)
83 {
84 PyObject *default_action;
85
86 default_action = get_warnings_attr("defaultaction");
87 if (default_action == NULL) {
88 if (PyErr_Occurred()) {
89 return NULL;
90 }
91 return _default_action;
92 }
93
94 Py_DECREF(_default_action);
95 _default_action = default_action;
96 return default_action;
97 }
98
99
100 /* The item is a borrowed reference. */
101 static const char *
102 get_filter(PyObject *category, PyObject *text, Py_ssize_t lineno,
103 PyObject *module, PyObject **item)
104 {
105 PyObject *action;
106 Py_ssize_t i;
107 PyObject *warnings_filters;
108
109 warnings_filters = get_warnings_attr("filters");
110 if (warnings_filters == NULL) {
111 if (PyErr_Occurred())
112 return NULL;
113 }
114 else {
115 Py_DECREF(_filters);
116 _filters = warnings_filters;
117 }
118
119 if (!PyList_Check(_filters)) {
120 PyErr_SetString(PyExc_ValueError,
121 MODULE_NAME ".filters must be a list");
122 return NULL;
123 }
124
125 /* _filters could change while we are iterating over it. */
126 for (i = 0; i < PyList_GET_SIZE(_filters); i++) {
127 PyObject *tmp_item, *action, *msg, *cat, *mod, *ln_obj;
128 Py_ssize_t ln;
129 int is_subclass, good_msg, good_mod;
130
131 tmp_item = *item = PyList_GET_ITEM(_filters, i);
132 if (PyTuple_Size(tmp_item) != 5) {
133 PyErr_Format(PyExc_ValueError,
134 MODULE_NAME ".filters item %zd isn't a 5-tuple", i);
135 return NULL;
136 }
137
138 /* Python code: action, msg, cat, mod, ln = item */
139 action = PyTuple_GET_ITEM(tmp_item, 0);
140 msg = PyTuple_GET_ITEM(tmp_item, 1);
141 cat = PyTuple_GET_ITEM(tmp_item, 2);
142 mod = PyTuple_GET_ITEM(tmp_item, 3);
143 ln_obj = PyTuple_GET_ITEM(tmp_item, 4);
144
145 good_msg = check_matched(msg, text);
146 good_mod = check_matched(mod, module);
147 is_subclass = PyObject_IsSubclass(category, cat);
148 ln = PyInt_AsSsize_t(ln_obj);
149 if (good_msg == -1 || good_mod == -1 || is_subclass == -1 ||
150 (ln == -1 && PyErr_Occurred()))
151 return NULL;
152
153 if (good_msg && is_subclass && good_mod && (ln == 0 || lineno == ln))
154 return PyString_AsString(action);
155 }
156
157 action = get_default_action();
158 if (action != NULL) {
159 return PyString_AsString(action);
160 }
161
162 PyErr_SetString(PyExc_ValueError,
163 MODULE_NAME ".defaultaction not found");
164 return NULL;
165 }
166
167
168 static int
169 already_warned(PyObject *registry, PyObject *key, int should_set)
170 {
171 PyObject *already_warned;
172
173 if (key == NULL)
174 return -1;
175
176 already_warned = PyDict_GetItem(registry, key);
177 if (already_warned != NULL) {
178 int rc = PyObject_IsTrue(already_warned);
179 if (rc != 0)
180 return rc;
181 }
182
183 /* This warning wasn't found in the registry, set it. */
184 if (should_set)
185 return PyDict_SetItem(registry, key, Py_True);
186 return 0;
187 }
188
189 /* New reference. */
190 static PyObject *
191 normalize_module(PyObject *filename)
192 {
193 PyObject *module;
194 const char *mod_str;
195 Py_ssize_t len;
196
197 int rc = PyObject_IsTrue(filename);
198 if (rc == -1)
199 return NULL;
200 else if (rc == 0)
201 return PyString_FromString("<unknown>");
202
203 mod_str = PyString_AsString(filename);
204 if (mod_str == NULL)
205 return NULL;
206 len = PyString_Size(filename);
207 if (len < 0)
208 return NULL;
209 if (len >= 3 &&
210 strncmp(mod_str + (len - 3), ".py", 3) == 0) {
211 module = PyString_FromStringAndSize(mod_str, len-3);
212 }
213 else {
214 module = filename;
215 Py_INCREF(module);
216 }
217 return module;
218 }
219
220 static int
221 update_registry(PyObject *registry, PyObject *text, PyObject *category,
222 int add_zero)
223 {
224 PyObject *altkey, *zero = NULL;
225 int rc;
226
227 if (add_zero) {
228 zero = PyInt_FromLong(0);
229 if (zero == NULL)
230 return -1;
231 altkey = PyTuple_Pack(3, text, category, zero);
232 }
233 else
234 altkey = PyTuple_Pack(2, text, category);
235
236 rc = already_warned(registry, altkey, 1);
237 Py_XDECREF(zero);
238 Py_XDECREF(altkey);
239 return rc;
240 }
241
242 static void
243 show_warning(PyObject *filename, int lineno, PyObject *text, PyObject
244 *category, PyObject *sourceline)
245 {
246 PyObject *f_stderr;
247 PyObject *name;
248 char lineno_str[128];
249
250 PyOS_snprintf(lineno_str, sizeof(lineno_str), ":%d: ", lineno);
251
252 name = PyObject_GetAttrString(category, "__name__");
253 if (name == NULL) /* XXX Can an object lack a '__name__' attribute? */
254 return;
255
256 f_stderr = PySys_GetObject("stderr");
257 if (f_stderr == NULL) {
258 fprintf(stderr, "lost sys.stderr\n");
259 Py_DECREF(name);
260 return;
261 }
262
263 /* Print "filename:lineno: category: text\n" */
264 PyFile_WriteObject(filename, f_stderr, Py_PRINT_RAW);
265 PyFile_WriteString(lineno_str, f_stderr);
266 PyFile_WriteObject(name, f_stderr, Py_PRINT_RAW);
267 PyFile_WriteString(": ", f_stderr);
268 PyFile_WriteObject(text, f_stderr, Py_PRINT_RAW);
269 PyFile_WriteString("\n", f_stderr);
270 Py_XDECREF(name);
271
272 /* Print " source_line\n" */
273 if (sourceline) {
274 char *source_line_str = PyString_AS_STRING(sourceline);
275 while (*source_line_str == ' ' || *source_line_str == '\t' ||
276 *source_line_str == '\014')
277 source_line_str++;
278
279 PyFile_WriteString(source_line_str, f_stderr);
280 PyFile_WriteString("\n", f_stderr);
281 }
282 else
283 _Py_DisplaySourceLine(f_stderr, PyString_AS_STRING(filename),
284 lineno, 2);
285 PyErr_Clear();
286 }
287
288 static PyObject *
289 warn_explicit(PyObject *category, PyObject *message,
290 PyObject *filename, int lineno,
291 PyObject *module, PyObject *registry, PyObject *sourceline)
292 {
293 PyObject *key = NULL, *text = NULL, *result = NULL, *lineno_obj = NULL;
294 PyObject *item = Py_None;
295 const char *action;
296 int rc;
297
298 if (registry && !PyDict_Check(registry) && (registry != Py_None)) {
299 PyErr_SetString(PyExc_TypeError, "'registry' must be a dict");
300 return NULL;
301 }
302
303 /* Normalize module. */
304 if (module == NULL) {
305 module = normalize_module(filename);
306 if (module == NULL)
307 return NULL;
308 }
309 else
310 Py_INCREF(module);
311
312 /* Normalize message. */
313 Py_INCREF(message); /* DECREF'ed in cleanup. */
314 rc = PyObject_IsInstance(message, PyExc_Warning);
315 if (rc == -1) {
316 goto cleanup;
317 }
318 if (rc == 1) {
319 text = PyObject_Str(message);
320 if (text == NULL)
321 goto cleanup;
322 category = (PyObject*)message->ob_type;
323 }
324 else {
325 text = message;
326 message = PyObject_CallFunction(category, "O", message);
327 if (message == NULL)
328 goto cleanup;
329 }
330
331 lineno_obj = PyInt_FromLong(lineno);
332 if (lineno_obj == NULL)
333 goto cleanup;
334
335 /* Create key. */
336 key = PyTuple_Pack(3, text, category, lineno_obj);
337 if (key == NULL)
338 goto cleanup;
339
340 if ((registry != NULL) && (registry != Py_None)) {
341 rc = already_warned(registry, key, 0);
342 if (rc == -1)
343 goto cleanup;
344 else if (rc == 1)
345 goto return_none;
346 /* Else this warning hasn't been generated before. */
347 }
348
349 action = get_filter(category, text, lineno, module, &item);
350 if (action == NULL)
351 goto cleanup;
352
353 if (strcmp(action, "error") == 0) {
354 PyErr_SetObject(category, message);
355 goto cleanup;
356 }
357
358 /* Store in the registry that we've been here, *except* when the action
359 is "always". */
360 rc = 0;
361 if (strcmp(action, "always") != 0) {
362 if (registry != NULL && registry != Py_None &&
363 PyDict_SetItem(registry, key, Py_True) < 0)
364 goto cleanup;
365 else if (strcmp(action, "ignore") == 0)
366 goto return_none;
367 else if (strcmp(action, "once") == 0) {
368 if (registry == NULL || registry == Py_None) {
369 registry = get_once_registry();
370 if (registry == NULL)
371 goto cleanup;
372 }
373 /* _once_registry[(text, category)] = 1 */
374 rc = update_registry(registry, text, category, 0);
375 }
376 else if (strcmp(action, "module") == 0) {
377 /* registry[(text, category, 0)] = 1 */
378 if (registry != NULL && registry != Py_None)
379 rc = update_registry(registry, text, category, 0);
380 }
381 else if (strcmp(action, "default") != 0) {
382 PyObject *to_str = PyObject_Str(item);
383 const char *err_str = "???";
384
385 if (to_str != NULL)
386 err_str = PyString_AS_STRING(to_str);
387 PyErr_Format(PyExc_RuntimeError,
388 "Unrecognized action (%s) in warnings.filters:\n %s",
389 action, err_str);
390 Py_XDECREF(to_str);
391 goto cleanup;
392 }
393 }
394
395 if (rc == 1) /* Already warned for this module. */
396 goto return_none;
397 if (rc == 0) {
398 PyObject *show_fxn = get_warnings_attr("showwarning");
399 if (show_fxn == NULL) {
400 if (PyErr_Occurred())
401 goto cleanup;
402 show_warning(filename, lineno, text, category, sourceline);
403 }
404 else {
405 PyObject *res;
406
407 if (!PyMethod_Check(show_fxn) && !PyFunction_Check(show_fxn)) {
408 PyErr_SetString(PyExc_TypeError,
409 "warnings.showwarning() must be set to a "
410 "function or method");
411 Py_DECREF(show_fxn);
412 goto cleanup;
413 }
414
415 res = PyObject_CallFunctionObjArgs(show_fxn, message, category,
416 filename, lineno_obj,
417 NULL);
418 Py_DECREF(show_fxn);
419 Py_XDECREF(res);
420 if (res == NULL)
421 goto cleanup;
422 }
423 }
424 else /* if (rc == -1) */
425 goto cleanup;
426
427 return_none:
428 result = Py_None;
429 Py_INCREF(result);
430
431 cleanup:
432 Py_XDECREF(key);
433 Py_XDECREF(text);
434 Py_XDECREF(lineno_obj);
435 Py_DECREF(module);
436 Py_XDECREF(message);
437 return result; /* Py_None or NULL. */
438 }
439
440 /* filename, module, and registry are new refs, globals is borrowed */
441 /* Returns 0 on error (no new refs), 1 on success */
442 static int
443 setup_context(Py_ssize_t stack_level, PyObject **filename, int *lineno,
444 PyObject **module, PyObject **registry)
445 {
446 PyObject *globals;
447
448 /* Setup globals and lineno. */
449 PyFrameObject *f = PyThreadState_GET()->frame;
450 while (--stack_level > 0 && f != NULL)
451 f = f->f_back;
452
453 if (f == NULL) {
454 globals = PyThreadState_Get()->interp->sysdict;
455 *lineno = 1;
456 }
457 else {
458 globals = f->f_globals;
459 *lineno = PyFrame_GetLineNumber(f);
460 }
461
462 *module = NULL;
463
464 /* Setup registry. */
465 assert(globals != NULL);
466 assert(PyDict_Check(globals));
467 *registry = PyDict_GetItemString(globals, "__warningregistry__");
468 if (*registry == NULL) {
469 int rc;
470
471 *registry = PyDict_New();
472 if (*registry == NULL)
473 return 0;
474
475 rc = PyDict_SetItemString(globals, "__warningregistry__", *registry);
476 if (rc < 0)
477 goto handle_error;
478 }
479 else
480 Py_INCREF(*registry);
481
482 /* Setup module. */
483 *module = PyDict_GetItemString(globals, "__name__");
484 if (*module == NULL) {
485 *module = PyString_FromString("<string>");
486 if (*module == NULL)
487 goto handle_error;
488 }
489 else
490 Py_INCREF(*module);
491
492 /* Setup filename. */
493 *filename = PyDict_GetItemString(globals, "__file__");
494 if (*filename != NULL && PyString_Check(*filename)) {
495 Py_ssize_t len = PyString_Size(*filename);
496 const char *file_str = PyString_AsString(*filename);
497 if (file_str == NULL || (len < 0 && PyErr_Occurred()))
498 goto handle_error;
499
500 /* if filename.lower().endswith((".pyc", ".pyo")): */
501 if (len >= 4 &&
502 file_str[len-4] == '.' &&
503 tolower(file_str[len-3]) == 'p' &&
504 tolower(file_str[len-2]) == 'y' &&
505 (tolower(file_str[len-1]) == 'c' ||
506 tolower(file_str[len-1]) == 'o'))
507 {
508 *filename = PyString_FromStringAndSize(file_str, len-1);
509 if (*filename == NULL)
510 goto handle_error;
511 }
512 else
513 Py_INCREF(*filename);
514 }
515 else {
516 const char *module_str = PyString_AsString(*module);
517 *filename = NULL;
518 if (module_str && strcmp(module_str, "__main__") == 0) {
519 PyObject *argv = PySys_GetObject("argv");
520 if (argv != NULL && PyList_Size(argv) > 0) {
521 int is_true;
522 *filename = PyList_GetItem(argv, 0);
523 Py_INCREF(*filename);
524 /* If sys.argv[0] is false, then use '__main__'. */
525 is_true = PyObject_IsTrue(*filename);
526 if (is_true < 0) {
527 Py_DECREF(*filename);
528 goto handle_error;
529 }
530 else if (!is_true) {
531 Py_DECREF(*filename);
532 *filename = PyString_FromString("__main__");
533 if (*filename == NULL)
534 goto handle_error;
535 }
536 }
537 else {
538 /* embedded interpreters don't have sys.argv, see bug #839151 */
539 *filename = PyString_FromString("__main__");
540 if (*filename == NULL)
541 goto handle_error;
542 }
543 }
544 if (*filename == NULL) {
545 *filename = *module;
546 Py_INCREF(*filename);
547 }
548 }
549
550 return 1;
551
552 handle_error:
553 /* filename not XDECREF'ed here as there is no way to jump here with a
554 dangling reference. */
555 Py_XDECREF(*registry);
556 Py_XDECREF(*module);
557 return 0;
558 }
559
560 static PyObject *
561 get_category(PyObject *message, PyObject *category)
562 {
563 int rc;
564
565 /* Get category. */
566 rc = PyObject_IsInstance(message, PyExc_Warning);
567 if (rc == -1)
568 return NULL;
569
570 if (rc == 1)
571 category = (PyObject*)message->ob_type;
572 else if (category == NULL)
573 category = PyExc_UserWarning;
574
575 /* Validate category. */
576 rc = PyObject_IsSubclass(category, PyExc_Warning);
577 if (rc == -1)
578 return NULL;
579 if (rc == 0) {
580 PyErr_SetString(PyExc_ValueError,
581 "category is not a subclass of Warning");
582 return NULL;
583 }
584
585 return category;
586 }
587
588 static PyObject *
589 do_warn(PyObject *message, PyObject *category, Py_ssize_t stack_level)
590 {
591 PyObject *filename, *module, *registry, *res;
592 int lineno;
593
594 if (!setup_context(stack_level, &filename, &lineno, &module, ®istry))
595 return NULL;
596
597 res = warn_explicit(category, message, filename, lineno, module, registry,
598 NULL);
599 Py_DECREF(filename);
600 Py_DECREF(registry);
601 Py_DECREF(module);
602 return res;
603 }
604
605 static PyObject *
606 warnings_warn(PyObject *self, PyObject *args, PyObject *kwds)
607 {
608 static char *kw_list[] = { "message", "category", "stacklevel", 0 };
609 PyObject *message, *category = NULL;
610 Py_ssize_t stack_level = 1;
611
612 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|On:warn", kw_list,
613 &message, &category, &stack_level))
614 return NULL;
615
616 category = get_category(message, category);
617 if (category == NULL)
618 return NULL;
619 return do_warn(message, category, stack_level);
620 }
621
622 static PyObject *
623 warnings_warn_explicit(PyObject *self, PyObject *args, PyObject *kwds)
624 {
625 static char *kwd_list[] = {"message", "category", "filename", "lineno",
626 "module", "registry", "module_globals", 0};
627 PyObject *message;
628 PyObject *category;
629 PyObject *filename;
630 int lineno;
631 PyObject *module = NULL;
632 PyObject *registry = NULL;
633 PyObject *module_globals = NULL;
634
635 if (!PyArg_ParseTupleAndKeywords(args, kwds, "OOOi|OOO:warn_explicit",
636 kwd_list, &message, &category, &filename, &lineno, &module,
637 ®istry, &module_globals))
638 return NULL;
639
640 if (module_globals) {
641 static PyObject *get_source_name = NULL;
642 static PyObject *splitlines_name = NULL;
643 PyObject *loader;
644 PyObject *module_name;
645 PyObject *source;
646 PyObject *source_list;
647 PyObject *source_line;
648 PyObject *returned;
649
650 if (get_source_name == NULL) {
651 get_source_name = PyString_InternFromString("get_source");
652 if (!get_source_name)
653 return NULL;
654 }
655 if (splitlines_name == NULL) {
656 splitlines_name = PyString_InternFromString("splitlines");
657 if (!splitlines_name)
658 return NULL;
659 }
660
661 /* Check/get the requisite pieces needed for the loader. */
662 loader = PyDict_GetItemString(module_globals, "__loader__");
663 module_name = PyDict_GetItemString(module_globals, "__name__");
664
665 if (loader == NULL || module_name == NULL)
666 goto standard_call;
667
668 /* Make sure the loader implements the optional get_source() method. */
669 if (!PyObject_HasAttrString(loader, "get_source"))
670 goto standard_call;
671 /* Call get_source() to get the source code. */
672 source = PyObject_CallMethodObjArgs(loader, get_source_name,
673 module_name, NULL);
674 if (!source)
675 return NULL;
676 else if (source == Py_None) {
677 Py_DECREF(Py_None);
678 goto standard_call;
679 }
680
681 /* Split the source into lines. */
682 source_list = PyObject_CallMethodObjArgs(source, splitlines_name,
683 NULL);
684 Py_DECREF(source);
685 if (!source_list)
686 return NULL;
687
688 /* Get the source line. */
689 source_line = PyList_GetItem(source_list, lineno-1);
690 if (!source_line) {
691 Py_DECREF(source_list);
692 return NULL;
693 }
694
695 /* Handle the warning. */
696 returned = warn_explicit(category, message, filename, lineno, module,
697 registry, source_line);
698 Py_DECREF(source_list);
699 return returned;
700 }
701
702 standard_call:
703 return warn_explicit(category, message, filename, lineno, module,
704 registry, NULL);
705 }
706
707
708 /* Function to issue a warning message; may raise an exception. */
709 int
710 PyErr_WarnEx(PyObject *category, const char *text, Py_ssize_t stack_level)
711 {
712 PyObject *res;
713 PyObject *message = PyString_FromString(text);
714 if (message == NULL)
715 return -1;
716
717 if (category == NULL)
718 category = PyExc_RuntimeWarning;
719
720 res = do_warn(message, category, stack_level);
721 Py_DECREF(message);
722 if (res == NULL)
723 return -1;
724 Py_DECREF(res);
725
726 return 0;
727 }
728
729 /* PyErr_Warn is only for backwards compatibility and will be removed.
730 Use PyErr_WarnEx instead. */
731
732 #undef PyErr_Warn
733
734 PyAPI_FUNC(int)
735 PyErr_Warn(PyObject *category, char *text)
736 {
737 return PyErr_WarnEx(category, text, 1);
738 }
739
740 /* Warning with explicit origin */
741 int
742 PyErr_WarnExplicit(PyObject *category, const char *text,
743 const char *filename_str, int lineno,
744 const char *module_str, PyObject *registry)
745 {
746 PyObject *res;
747 PyObject *message = PyString_FromString(text);
748 PyObject *filename = PyString_FromString(filename_str);
749 PyObject *module = NULL;
750 int ret = -1;
751
752 if (message == NULL || filename == NULL)
753 goto exit;
754 if (module_str != NULL) {
755 module = PyString_FromString(module_str);
756 if (module == NULL)
757 goto exit;
758 }
759
760 if (category == NULL)
761 category = PyExc_RuntimeWarning;
762 res = warn_explicit(category, message, filename, lineno, module, registry,
763 NULL);
764 if (res == NULL)
765 goto exit;
766 Py_DECREF(res);
767 ret = 0;
768
769 exit:
770 Py_XDECREF(message);
771 Py_XDECREF(module);
772 Py_XDECREF(filename);
773 return ret;
774 }
775
776
777 PyDoc_STRVAR(warn_doc,
778 "Issue a warning, or maybe ignore it or raise an exception.");
779
780 PyDoc_STRVAR(warn_explicit_doc,
781 "Low-level inferface to warnings functionality.");
782
783 static PyMethodDef warnings_functions[] = {
784 {"warn", (PyCFunction)warnings_warn, METH_VARARGS | METH_KEYWORDS,
785 warn_doc},
786 {"warn_explicit", (PyCFunction)warnings_warn_explicit,
787 METH_VARARGS | METH_KEYWORDS, warn_explicit_doc},
788 /* XXX(brett.cannon): add showwarning? */
789 /* XXX(brett.cannon): Reasonable to add formatwarning? */
790 {NULL, NULL} /* sentinel */
791 };
792
793
794 static PyObject *
795 create_filter(PyObject *category, const char *action)
796 {
797 static PyObject *ignore_str = NULL;
798 static PyObject *error_str = NULL;
799 static PyObject *default_str = NULL;
800 PyObject *action_obj = NULL;
801 PyObject *lineno, *result;
802
803 if (!strcmp(action, "ignore")) {
804 if (ignore_str == NULL) {
805 ignore_str = PyString_InternFromString("ignore");
806 if (ignore_str == NULL)
807 return NULL;
808 }
809 action_obj = ignore_str;
810 }
811 else if (!strcmp(action, "error")) {
812 if (error_str == NULL) {
813 error_str = PyString_InternFromString("error");
814 if (error_str == NULL)
815 return NULL;
816 }
817 action_obj = error_str;
818 }
819 else if (!strcmp(action, "default")) {
820 if (default_str == NULL) {
821 default_str = PyString_InternFromString("default");
822 if (default_str == NULL)
823 return NULL;
824 }
825 action_obj = default_str;
826 }
827 else {
828 Py_FatalError("unknown action");
829 }
830
831 /* This assumes the line number is zero for now. */
832 lineno = PyInt_FromLong(0);
833 if (lineno == NULL)
834 return NULL;
835 result = PyTuple_Pack(5, action_obj, Py_None, category, Py_None, lineno);
836 Py_DECREF(lineno);
837 return result;
838 }
839
840 static PyObject *
841 init_filters(void)
842 {
843 /* Don't silence DeprecationWarning if -3 or -Q were used. */
844 PyObject *filters = PyList_New(Py_Py3kWarningFlag ||
845 Py_DivisionWarningFlag ? 3 : 4);
846 unsigned int pos = 0; /* Post-incremented in each use. */
847 unsigned int x;
848 const char *bytes_action;
849
850 if (filters == NULL)
851 return NULL;
852
853 /* If guard changes, make sure to update 'filters' initialization above. */
854 if (!Py_Py3kWarningFlag && !Py_DivisionWarningFlag) {
855 PyList_SET_ITEM(filters, pos++,
856 create_filter(PyExc_DeprecationWarning, "ignore"));
857 }
858 PyList_SET_ITEM(filters, pos++,
859 create_filter(PyExc_PendingDeprecationWarning, "ignore"));
860 PyList_SET_ITEM(filters, pos++,
861 create_filter(PyExc_ImportWarning, "ignore"));
862 if (Py_BytesWarningFlag > 1)
863 bytes_action = "error";
864 else if (Py_BytesWarningFlag)
865 bytes_action = "default";
866 else
867 bytes_action = "ignore";
868 PyList_SET_ITEM(filters, pos++, create_filter(PyExc_BytesWarning,
869 bytes_action));
870
871 for (x = 0; x < pos; x += 1) {
872 if (PyList_GET_ITEM(filters, x) == NULL) {
873 Py_DECREF(filters);
874 return NULL;
875 }
876 }
877
878 return filters;
879 }
880
881
882 PyMODINIT_FUNC
883 _PyWarnings_Init(void)
884 {
885 PyObject *m;
886
887 m = Py_InitModule3(MODULE_NAME, warnings_functions, warnings__doc__);
888 if (m == NULL)
889 return;
890
891 _filters = init_filters();
892 if (_filters == NULL)
893 return;
894 Py_INCREF(_filters);
895 if (PyModule_AddObject(m, "filters", _filters) < 0)
896 return;
897
898 _once_registry = PyDict_New();
899 if (_once_registry == NULL)
900 return;
901 Py_INCREF(_once_registry);
902 if (PyModule_AddObject(m, "once_registry", _once_registry) < 0)
903 return;
904
905 _default_action = PyString_FromString("default");
906 if (_default_action == NULL)
907 return;
908 if (PyModule_AddObject(m, "default_action", _default_action) < 0)
909 return;
910 }