-
-
Notifications
You must be signed in to change notification settings - Fork 31.7k
/
Copy pathpylifecycle.c
2078 lines (1789 loc) · 60.6 KB
/
pylifecycle.c
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
/* Python interpreter top-level routines, including init/exit */
#include "Python.h"
#include "Python-ast.h"
#undef Yield /* undefine macro conflicting with winbase.h */
#include "internal/pystate.h"
#include "grammar.h"
#include "node.h"
#include "token.h"
#include "parsetok.h"
#include "errcode.h"
#include "code.h"
#include "symtable.h"
#include "ast.h"
#include "marshal.h"
#include "osdefs.h"
#include <locale.h>
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef MS_WINDOWS
#include "malloc.h" /* for alloca */
#endif
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#ifdef MS_WINDOWS
#undef BYTE
#include "windows.h"
extern PyTypeObject PyWindowsConsoleIO_Type;
#define PyWindowsConsoleIO_Check(op) (PyObject_TypeCheck((op), &PyWindowsConsoleIO_Type))
#endif
_Py_IDENTIFIER(flush);
_Py_IDENTIFIER(name);
_Py_IDENTIFIER(stdin);
_Py_IDENTIFIER(stdout);
_Py_IDENTIFIER(stderr);
_Py_IDENTIFIER(threading);
#ifdef __cplusplus
extern "C" {
#endif
extern wchar_t *Py_GetPath(void);
extern grammar _PyParser_Grammar; /* From graminit.c */
/* Forward */
static void initmain(PyInterpreterState *interp);
static int initfsencoding(PyInterpreterState *interp);
static void initsite(void);
static int initstdio(void);
static void initsigs(void);
static void call_py_exitfuncs(void);
static void wait_for_thread_shutdown(void);
static void call_ll_exitfuncs(void);
extern int _PyUnicode_Init(void);
extern int _PyStructSequence_Init(void);
extern void _PyUnicode_Fini(void);
extern int _PyLong_Init(void);
extern void PyLong_Fini(void);
extern int _PyFaulthandler_Init(void);
extern void _PyFaulthandler_Fini(void);
extern void _PyHash_Fini(void);
extern int _PyTraceMalloc_Init(void);
extern int _PyTraceMalloc_Fini(void);
extern void _Py_ReadyTypes(void);
extern void _PyGILState_Init(PyInterpreterState *, PyThreadState *);
extern void _PyGILState_Fini(void);
_PyRuntimeState _PyRuntime = {0, 0};
void
_PyRuntime_Initialize(void)
{
/* XXX We only initialize once in the process, which aligns with
the static initialization of the former globals now found in
_PyRuntime. However, _PyRuntime *should* be initialized with
every Py_Initialize() call, but doing so breaks the runtime.
This is because the runtime state is not properly finalized
currently. */
static int initialized = 0;
if (initialized)
return;
initialized = 1;
_PyRuntimeState_Init(&_PyRuntime);
}
void
_PyRuntime_Finalize(void)
{
_PyRuntimeState_Fini(&_PyRuntime);
}
int
_Py_IsFinalizing(void)
{
return _PyRuntime.finalizing != NULL;
}
/* Global configuration variable declarations are in pydebug.h */
/* XXX (ncoghlan): move those declarations to pylifecycle.h? */
int Py_DebugFlag; /* Needed by parser.c */
int Py_VerboseFlag; /* Needed by import.c */
int Py_QuietFlag; /* Needed by sysmodule.c */
int Py_InteractiveFlag; /* Needed by Py_FdIsInteractive() below */
int Py_InspectFlag; /* Needed to determine whether to exit at SystemExit */
int Py_OptimizeFlag = 0; /* Needed by compile.c */
int Py_NoSiteFlag; /* Suppress 'import site' */
int Py_BytesWarningFlag; /* Warn on str(bytes) and str(buffer) */
int Py_UseClassExceptionsFlag = 1; /* Needed by bltinmodule.c: deprecated */
int Py_FrozenFlag; /* Needed by getpath.c */
int Py_IgnoreEnvironmentFlag; /* e.g. PYTHONPATH, PYTHONHOME */
int Py_DontWriteBytecodeFlag; /* Suppress writing bytecode files (*.pyc) */
int Py_NoUserSiteDirectory = 0; /* for -s and site.py */
int Py_UnbufferedStdioFlag = 0; /* Unbuffered binary std{in,out,err} */
int Py_HashRandomizationFlag = 0; /* for -R and PYTHONHASHSEED */
int Py_IsolatedFlag = 0; /* for -I, isolate from user's env */
#ifdef MS_WINDOWS
int Py_LegacyWindowsFSEncodingFlag = 0; /* Uses mbcs instead of utf-8 */
int Py_LegacyWindowsStdioFlag = 0; /* Uses FileIO instead of WindowsConsoleIO */
#endif
/* Hack to force loading of object files */
int (*_PyOS_mystrnicmp_hack)(const char *, const char *, Py_ssize_t) = \
PyOS_mystrnicmp; /* Python/pystrcmp.o */
/* PyModule_GetWarningsModule is no longer necessary as of 2.6
since _warnings is builtin. This API should not be used. */
PyObject *
PyModule_GetWarningsModule(void)
{
return PyImport_ImportModule("warnings");
}
/* APIs to access the initialization flags
*
* Can be called prior to Py_Initialize.
*/
int
_Py_IsCoreInitialized(void)
{
return _PyRuntime.core_initialized;
}
int
Py_IsInitialized(void)
{
return _PyRuntime.initialized;
}
/* Helper to allow an embedding application to override the normal
* mechanism that attempts to figure out an appropriate IO encoding
*/
static char *_Py_StandardStreamEncoding = NULL;
static char *_Py_StandardStreamErrors = NULL;
int
Py_SetStandardStreamEncoding(const char *encoding, const char *errors)
{
if (Py_IsInitialized()) {
/* This is too late to have any effect */
return -1;
}
/* Can't call PyErr_NoMemory() on errors, as Python hasn't been
* initialised yet.
*
* However, the raw memory allocators are initialised appropriately
* as C static variables, so _PyMem_RawStrdup is OK even though
* Py_Initialize hasn't been called yet.
*/
if (encoding) {
_Py_StandardStreamEncoding = _PyMem_RawStrdup(encoding);
if (!_Py_StandardStreamEncoding) {
return -2;
}
}
if (errors) {
_Py_StandardStreamErrors = _PyMem_RawStrdup(errors);
if (!_Py_StandardStreamErrors) {
if (_Py_StandardStreamEncoding) {
PyMem_RawFree(_Py_StandardStreamEncoding);
}
return -3;
}
}
#ifdef MS_WINDOWS
if (_Py_StandardStreamEncoding) {
/* Overriding the stream encoding implies legacy streams */
Py_LegacyWindowsStdioFlag = 1;
}
#endif
return 0;
}
/* Global initializations. Can be undone by Py_FinalizeEx(). Don't
call this twice without an intervening Py_FinalizeEx() call. When
initializations fail, a fatal error is issued and the function does
not return. On return, the first thread and interpreter state have
been created.
Locking: you must hold the interpreter lock while calling this.
(If the lock has not yet been initialized, that's equivalent to
having the lock, but you cannot use multiple threads.)
*/
static int
add_flag(int flag, const char *envs)
{
int env = atoi(envs);
if (flag < env)
flag = env;
if (flag < 1)
flag = 1;
return flag;
}
static char*
get_codec_name(const char *encoding)
{
const char *name_utf8;
char *name_str;
PyObject *codec, *name = NULL;
codec = _PyCodec_Lookup(encoding);
if (!codec)
goto error;
name = _PyObject_GetAttrId(codec, &PyId_name);
Py_CLEAR(codec);
if (!name)
goto error;
name_utf8 = PyUnicode_AsUTF8(name);
if (name_utf8 == NULL)
goto error;
name_str = _PyMem_RawStrdup(name_utf8);
Py_DECREF(name);
if (name_str == NULL) {
PyErr_NoMemory();
return NULL;
}
return name_str;
error:
Py_XDECREF(codec);
Py_XDECREF(name);
return NULL;
}
static char*
get_locale_encoding(void)
{
#if defined(HAVE_LANGINFO_H) && defined(CODESET)
char* codeset = nl_langinfo(CODESET);
if (!codeset || codeset[0] == '\0') {
PyErr_SetString(PyExc_ValueError, "CODESET is not set or empty");
return NULL;
}
return get_codec_name(codeset);
#elif defined(__ANDROID__)
return get_codec_name("UTF-8");
#else
PyErr_SetNone(PyExc_NotImplementedError);
return NULL;
#endif
}
static void
initimport(PyInterpreterState *interp, PyObject *sysmod)
{
PyObject *importlib;
PyObject *impmod;
PyObject *value;
/* Import _importlib through its frozen version, _frozen_importlib. */
if (PyImport_ImportFrozenModule("_frozen_importlib") <= 0) {
Py_FatalError("Py_Initialize: can't import _frozen_importlib");
}
else if (Py_VerboseFlag) {
PySys_FormatStderr("import _frozen_importlib # frozen\n");
}
importlib = PyImport_AddModule("_frozen_importlib");
if (importlib == NULL) {
Py_FatalError("Py_Initialize: couldn't get _frozen_importlib from "
"sys.modules");
}
interp->importlib = importlib;
Py_INCREF(interp->importlib);
interp->import_func = PyDict_GetItemString(interp->builtins, "__import__");
if (interp->import_func == NULL)
Py_FatalError("Py_Initialize: __import__ not found");
Py_INCREF(interp->import_func);
/* Import the _imp module */
impmod = PyInit_imp();
if (impmod == NULL) {
Py_FatalError("Py_Initialize: can't import _imp");
}
else if (Py_VerboseFlag) {
PySys_FormatStderr("import _imp # builtin\n");
}
if (_PyImport_SetModuleString("_imp", impmod) < 0) {
Py_FatalError("Py_Initialize: can't save _imp to sys.modules");
}
/* Install importlib as the implementation of import */
value = PyObject_CallMethod(importlib, "_install", "OO", sysmod, impmod);
if (value != NULL) {
Py_DECREF(value);
value = PyObject_CallMethod(importlib,
"_install_external_importers", "");
}
if (value == NULL) {
PyErr_Print();
Py_FatalError("Py_Initialize: importlib install failed");
}
Py_DECREF(value);
Py_DECREF(impmod);
_PyImportZip_Init();
}
static void
initexternalimport(PyInterpreterState *interp)
{
PyObject *value;
value = PyObject_CallMethod(interp->importlib,
"_install_external_importers", "");
if (value == NULL) {
PyErr_Print();
Py_FatalError("Py_EndInitialization: external importer setup failed");
}
Py_DECREF(value);
}
/* Helper functions to better handle the legacy C locale
*
* The legacy C locale assumes ASCII as the default text encoding, which
* causes problems not only for the CPython runtime, but also other
* components like GNU readline.
*
* Accordingly, when the CLI detects it, it attempts to coerce it to a
* more capable UTF-8 based alternative as follows:
*
* if (_Py_LegacyLocaleDetected()) {
* _Py_CoerceLegacyLocale();
* }
*
* See the documentation of the PYTHONCOERCECLOCALE setting for more details.
*
* Locale coercion also impacts the default error handler for the standard
* streams: while the usual default is "strict", the default for the legacy
* C locale and for any of the coercion target locales is "surrogateescape".
*/
int
_Py_LegacyLocaleDetected(void)
{
#ifndef MS_WINDOWS
/* On non-Windows systems, the C locale is considered a legacy locale */
/* XXX (ncoghlan): some platforms (notably Mac OS X) don't appear to treat
* the POSIX locale as a simple alias for the C locale, so
* we may also want to check for that explicitly.
*/
const char *ctype_loc = setlocale(LC_CTYPE, NULL);
return ctype_loc != NULL && strcmp(ctype_loc, "C") == 0;
#else
/* Windows uses code pages instead of locales, so no locale is legacy */
return 0;
#endif
}
static const char *_C_LOCALE_WARNING =
"Python runtime initialized with LC_CTYPE=C (a locale with default ASCII "
"encoding), which may cause Unicode compatibility problems. Using C.UTF-8, "
"C.utf8, or UTF-8 (if available) as alternative Unicode-compatible "
"locales is recommended.\n";
static int
_legacy_locale_warnings_enabled(void)
{
const char *coerce_c_locale = getenv("PYTHONCOERCECLOCALE");
return (coerce_c_locale != NULL &&
strncmp(coerce_c_locale, "warn", 5) == 0);
}
static void
_emit_stderr_warning_for_legacy_locale(void)
{
if (_legacy_locale_warnings_enabled()) {
if (_Py_LegacyLocaleDetected()) {
fprintf(stderr, "%s", _C_LOCALE_WARNING);
}
}
}
typedef struct _CandidateLocale {
const char *locale_name; /* The locale to try as a coercion target */
} _LocaleCoercionTarget;
static _LocaleCoercionTarget _TARGET_LOCALES[] = {
{"C.UTF-8"},
{"C.utf8"},
{"UTF-8"},
{NULL}
};
static char *
get_default_standard_stream_error_handler(void)
{
const char *ctype_loc = setlocale(LC_CTYPE, NULL);
if (ctype_loc != NULL) {
/* "surrogateescape" is the default in the legacy C locale */
if (strcmp(ctype_loc, "C") == 0) {
return "surrogateescape";
}
#ifdef PY_COERCE_C_LOCALE
/* "surrogateescape" is the default in locale coercion target locales */
const _LocaleCoercionTarget *target = NULL;
for (target = _TARGET_LOCALES; target->locale_name; target++) {
if (strcmp(ctype_loc, target->locale_name) == 0) {
return "surrogateescape";
}
}
#endif
}
/* Otherwise return NULL to request the typical default error handler */
return NULL;
}
#ifdef PY_COERCE_C_LOCALE
static const char *_C_LOCALE_COERCION_WARNING =
"Python detected LC_CTYPE=C: LC_CTYPE coerced to %.20s (set another locale "
"or PYTHONCOERCECLOCALE=0 to disable this locale coercion behavior).\n";
static void
_coerce_default_locale_settings(const _LocaleCoercionTarget *target)
{
const char *newloc = target->locale_name;
/* Reset locale back to currently configured defaults */
setlocale(LC_ALL, "");
/* Set the relevant locale environment variable */
if (setenv("LC_CTYPE", newloc, 1)) {
fprintf(stderr,
"Error setting LC_CTYPE, skipping C locale coercion\n");
return;
}
if (_legacy_locale_warnings_enabled()) {
fprintf(stderr, _C_LOCALE_COERCION_WARNING, newloc);
}
/* Reconfigure with the overridden environment variables */
setlocale(LC_ALL, "");
}
#endif
void
_Py_CoerceLegacyLocale(void)
{
#ifdef PY_COERCE_C_LOCALE
/* We ignore the Python -E and -I flags here, as the CLI needs to sort out
* the locale settings *before* we try to do anything with the command
* line arguments. For cross-platform debugging purposes, we also need
* to give end users a way to force even scripts that are otherwise
* isolated from their environment to use the legacy ASCII-centric C
* locale.
*
* Ignoring -E and -I is safe from a security perspective, as we only use
* the setting to turn *off* the implicit locale coercion, and anyone with
* access to the process environment already has the ability to set
* `LC_ALL=C` to override the C level locale settings anyway.
*/
const char *coerce_c_locale = getenv("PYTHONCOERCECLOCALE");
if (coerce_c_locale == NULL || strncmp(coerce_c_locale, "0", 2) != 0) {
/* PYTHONCOERCECLOCALE is not set, or is set to something other than "0" */
const char *locale_override = getenv("LC_ALL");
if (locale_override == NULL || *locale_override == '\0') {
/* LC_ALL is also not set (or is set to an empty string) */
const _LocaleCoercionTarget *target = NULL;
for (target = _TARGET_LOCALES; target->locale_name; target++) {
const char *new_locale = setlocale(LC_CTYPE,
target->locale_name);
if (new_locale != NULL) {
#if !defined(__APPLE__) && defined(HAVE_LANGINFO_H) && defined(CODESET)
/* Also ensure that nl_langinfo works in this locale */
char *codeset = nl_langinfo(CODESET);
if (!codeset || *codeset == '\0') {
/* CODESET is not set or empty, so skip coercion */
new_locale = NULL;
setlocale(LC_CTYPE, "");
continue;
}
#endif
/* Successfully configured locale, so make it the default */
_coerce_default_locale_settings(target);
return;
}
}
}
}
/* No C locale warning here, as Py_Initialize will emit one later */
#endif
}
/* Global initializations. Can be undone by Py_Finalize(). Don't
call this twice without an intervening Py_Finalize() call.
Every call to Py_InitializeCore, Py_Initialize or Py_InitializeEx
must have a corresponding call to Py_Finalize.
Locking: you must hold the interpreter lock while calling these APIs.
(If the lock has not yet been initialized, that's equivalent to
having the lock, but you cannot use multiple threads.)
*/
/* Begin interpreter initialization
*
* On return, the first thread and interpreter state have been created,
* but the compiler, signal handling, multithreading and
* multiple interpreter support, and codec infrastructure are not yet
* available.
*
* The import system will support builtin and frozen modules only.
* The only supported io is writing to sys.stderr
*
* If any operation invoked by this function fails, a fatal error is
* issued and the function does not return.
*
* Any code invoked from this function should *not* assume it has access
* to the Python C API (unless the API is explicitly listed as being
* safe to call without calling Py_Initialize first)
*/
/* TODO: Progressively move functionality from Py_BeginInitialization to
* Py_ReadConfig and Py_EndInitialization
*/
void _Py_InitializeCore(const _PyCoreConfig *config)
{
PyInterpreterState *interp;
PyThreadState *tstate;
PyObject *bimod, *sysmod, *pstderr;
char *p;
_PyCoreConfig core_config = _PyCoreConfig_INIT;
_PyMainInterpreterConfig preinit_config = _PyMainInterpreterConfig_INIT;
_PyRuntime_Initialize();
if (config != NULL) {
core_config = *config;
}
if (_PyRuntime.initialized) {
Py_FatalError("Py_InitializeCore: main interpreter already initialized");
}
if (_PyRuntime.core_initialized) {
Py_FatalError("Py_InitializeCore: runtime core already initialized");
}
/* Py_Finalize leaves _Py_Finalizing set in order to help daemon
* threads behave a little more gracefully at interpreter shutdown.
* We clobber it here so the new interpreter can start with a clean
* slate.
*
* However, this may still lead to misbehaviour if there are daemon
* threads still hanging around from a previous Py_Initialize/Finalize
* pair :(
*/
_PyRuntime.finalizing = NULL;
if (_PyMem_SetupAllocators(core_config.allocator) < 0) {
fprintf(stderr,
"Error in PYTHONMALLOC: unknown allocator \"%s\"!\n",
core_config.allocator);
exit(1);
}
#ifdef __ANDROID__
/* Passing "" to setlocale() on Android requests the C locale rather
* than checking environment variables, so request C.UTF-8 explicitly
*/
setlocale(LC_CTYPE, "C.UTF-8");
#else
#ifndef MS_WINDOWS
/* Set up the LC_CTYPE locale, so we can obtain
the locale's charset without having to switch
locales. */
setlocale(LC_CTYPE, "");
_emit_stderr_warning_for_legacy_locale();
#endif
#endif
if ((p = Py_GETENV("PYTHONDEBUG")) && *p != '\0')
Py_DebugFlag = add_flag(Py_DebugFlag, p);
if ((p = Py_GETENV("PYTHONVERBOSE")) && *p != '\0')
Py_VerboseFlag = add_flag(Py_VerboseFlag, p);
if ((p = Py_GETENV("PYTHONOPTIMIZE")) && *p != '\0')
Py_OptimizeFlag = add_flag(Py_OptimizeFlag, p);
if ((p = Py_GETENV("PYTHONDONTWRITEBYTECODE")) && *p != '\0')
Py_DontWriteBytecodeFlag = add_flag(Py_DontWriteBytecodeFlag, p);
/* The variable is only tested for existence here;
_Py_HashRandomization_Init will check its value further. */
if ((p = Py_GETENV("PYTHONHASHSEED")) && *p != '\0')
Py_HashRandomizationFlag = add_flag(Py_HashRandomizationFlag, p);
#ifdef MS_WINDOWS
if ((p = Py_GETENV("PYTHONLEGACYWINDOWSFSENCODING")) && *p != '\0')
Py_LegacyWindowsFSEncodingFlag = add_flag(Py_LegacyWindowsFSEncodingFlag, p);
if ((p = Py_GETENV("PYTHONLEGACYWINDOWSSTDIO")) && *p != '\0')
Py_LegacyWindowsStdioFlag = add_flag(Py_LegacyWindowsStdioFlag, p);
#endif
_Py_HashRandomization_Init(&core_config);
if (!core_config.use_hash_seed || core_config.hash_seed) {
/* Random or non-zero hash seed */
Py_HashRandomizationFlag = 1;
}
_PyInterpreterState_Enable(&_PyRuntime);
interp = PyInterpreterState_New();
if (interp == NULL)
Py_FatalError("Py_InitializeCore: can't make main interpreter");
interp->core_config = core_config;
interp->config = preinit_config;
tstate = PyThreadState_New(interp);
if (tstate == NULL)
Py_FatalError("Py_InitializeCore: can't make first thread");
(void) PyThreadState_Swap(tstate);
/* We can't call _PyEval_FiniThreads() in Py_FinalizeEx because
destroying the GIL might fail when it is being referenced from
another running thread (see issue #9901).
Instead we destroy the previously created GIL here, which ensures
that we can call Py_Initialize / Py_FinalizeEx multiple times. */
_PyEval_FiniThreads();
/* Auto-thread-state API */
_PyGILState_Init(interp, tstate);
_Py_ReadyTypes();
if (!_PyFrame_Init())
Py_FatalError("Py_InitializeCore: can't init frames");
if (!_PyLong_Init())
Py_FatalError("Py_InitializeCore: can't init longs");
if (!PyByteArray_Init())
Py_FatalError("Py_InitializeCore: can't init bytearray");
if (!_PyFloat_Init())
Py_FatalError("Py_InitializeCore: can't init float");
PyObject *modules = PyDict_New();
if (modules == NULL)
Py_FatalError("Py_InitializeCore: can't make modules dictionary");
sysmod = _PySys_BeginInit();
if (sysmod == NULL)
Py_FatalError("Py_InitializeCore: can't initialize sys");
interp->sysdict = PyModule_GetDict(sysmod);
if (interp->sysdict == NULL)
Py_FatalError("Py_InitializeCore: can't initialize sys dict");
Py_INCREF(interp->sysdict);
PyDict_SetItemString(interp->sysdict, "modules", modules);
_PyImport_FixupBuiltin(sysmod, "sys", modules);
/* Init Unicode implementation; relies on the codec registry */
if (_PyUnicode_Init() < 0)
Py_FatalError("Py_InitializeCore: can't initialize unicode");
if (_PyStructSequence_Init() < 0)
Py_FatalError("Py_InitializeCore: can't initialize structseq");
bimod = _PyBuiltin_Init();
if (bimod == NULL)
Py_FatalError("Py_InitializeCore: can't initialize builtins modules");
_PyImport_FixupBuiltin(bimod, "builtins", modules);
interp->builtins = PyModule_GetDict(bimod);
if (interp->builtins == NULL)
Py_FatalError("Py_InitializeCore: can't initialize builtins dict");
Py_INCREF(interp->builtins);
/* initialize builtin exceptions */
_PyExc_Init(bimod);
/* Set up a preliminary stderr printer until we have enough
infrastructure for the io module in place. */
pstderr = PyFile_NewStdPrinter(fileno(stderr));
if (pstderr == NULL)
Py_FatalError("Py_InitializeCore: can't set preliminary stderr");
_PySys_SetObjectId(&PyId_stderr, pstderr);
PySys_SetObject("__stderr__", pstderr);
Py_DECREF(pstderr);
_PyImport_Init();
_PyImportHooks_Init();
/* Initialize _warnings. */
_PyWarnings_Init();
/* This call sets up builtin and frozen import support */
if (!interp->core_config._disable_importlib) {
initimport(interp, sysmod);
}
/* Only when we get here is the runtime core fully initialized */
_PyRuntime.core_initialized = 1;
}
/* Read configuration settings from standard locations
*
* This function doesn't make any changes to the interpreter state - it
* merely populates any missing configuration settings. This allows an
* embedding application to completely override a config option by
* setting it before calling this function, or else modify the default
* setting before passing the fully populated config to Py_EndInitialization.
*
* More advanced selective initialization tricks are possible by calling
* this function multiple times with various preconfigured settings.
*/
int _Py_ReadMainInterpreterConfig(_PyMainInterpreterConfig *config)
{
/* Signal handlers are installed by default */
if (config->install_signal_handlers < 0) {
config->install_signal_handlers = 1;
}
return 0;
}
/* Update interpreter state based on supplied configuration settings
*
* After calling this function, most of the restrictions on the interpreter
* are lifted. The only remaining incomplete settings are those related
* to the main module (sys.argv[0], __main__ metadata)
*
* Calling this when the interpreter is not initializing, is already
* initialized or without a valid current thread state is a fatal error.
* Other errors should be reported as normal Python exceptions with a
* non-zero return code.
*/
int _Py_InitializeMainInterpreter(const _PyMainInterpreterConfig *config)
{
PyInterpreterState *interp;
PyThreadState *tstate;
if (!_PyRuntime.core_initialized) {
Py_FatalError("Py_InitializeMainInterpreter: runtime core not initialized");
}
if (_PyRuntime.initialized) {
Py_FatalError("Py_InitializeMainInterpreter: main interpreter already initialized");
}
/* Get current thread state and interpreter pointer */
tstate = PyThreadState_GET();
if (!tstate)
Py_FatalError("Py_InitializeMainInterpreter: failed to read thread state");
interp = tstate->interp;
if (!interp)
Py_FatalError("Py_InitializeMainInterpreter: failed to get interpreter");
/* Now finish configuring the main interpreter */
interp->config = *config;
if (interp->core_config._disable_importlib) {
/* Special mode for freeze_importlib: run with no import system
*
* This means anything which needs support from extension modules
* or pure Python code in the standard library won't work.
*/
_PyRuntime.initialized = 1;
return 0;
}
/* TODO: Report exceptions rather than fatal errors below here */
if (_PyTime_Init() < 0)
Py_FatalError("Py_InitializeMainInterpreter: can't initialize time");
/* Finish setting up the sys module and import system */
/* GetPath may initialize state that _PySys_EndInit locks
in, and so has to be called first. */
/* TODO: Call Py_GetPath() in Py_ReadConfig, rather than here */
PySys_SetPath(Py_GetPath());
if (_PySys_EndInit(interp->sysdict) < 0)
Py_FatalError("Py_InitializeMainInterpreter: can't finish initializing sys");
initexternalimport(interp);
/* initialize the faulthandler module */
if (_PyFaulthandler_Init())
Py_FatalError("Py_InitializeMainInterpreter: can't initialize faulthandler");
if (initfsencoding(interp) < 0)
Py_FatalError("Py_InitializeMainInterpreter: unable to load the file system codec");
if (config->install_signal_handlers)
initsigs(); /* Signal handling stuff, including initintr() */
if (_PyTraceMalloc_Init() < 0)
Py_FatalError("Py_InitializeMainInterpreter: can't initialize tracemalloc");
initmain(interp); /* Module __main__ */
if (initstdio() < 0)
Py_FatalError(
"Py_InitializeMainInterpreter: can't initialize sys standard streams");
/* Initialize warnings. */
if (PySys_HasWarnOptions()) {
PyObject *warnings_module = PyImport_ImportModule("warnings");
if (warnings_module == NULL) {
fprintf(stderr, "'import warnings' failed; traceback:\n");
PyErr_Print();
}
Py_XDECREF(warnings_module);
}
_PyRuntime.initialized = 1;
if (!Py_NoSiteFlag)
initsite(); /* Module site */
return 0;
}
#undef _INIT_DEBUG_PRINT
void
_Py_InitializeEx_Private(int install_sigs, int install_importlib)
{
_PyCoreConfig core_config = _PyCoreConfig_INIT;
_PyMainInterpreterConfig config = _PyMainInterpreterConfig_INIT;
/* TODO: Moar config options! */
core_config.ignore_environment = Py_IgnoreEnvironmentFlag;
core_config._disable_importlib = !install_importlib;
config.install_signal_handlers = install_sigs;
_Py_InitializeCore(&core_config);
/* TODO: Print any exceptions raised by these operations */
if (_Py_ReadMainInterpreterConfig(&config))
Py_FatalError("Py_Initialize: Py_ReadMainInterpreterConfig failed");
if (_Py_InitializeMainInterpreter(&config))
Py_FatalError("Py_Initialize: Py_InitializeMainInterpreter failed");
}
void
Py_InitializeEx(int install_sigs)
{
_Py_InitializeEx_Private(install_sigs, 1);
}
void
Py_Initialize(void)
{
Py_InitializeEx(1);
}
#ifdef COUNT_ALLOCS
extern void dump_counts(FILE*);
#endif
/* Flush stdout and stderr */
static int
file_is_closed(PyObject *fobj)
{
int r;
PyObject *tmp = PyObject_GetAttrString(fobj, "closed");
if (tmp == NULL) {
PyErr_Clear();
return 0;
}
r = PyObject_IsTrue(tmp);
Py_DECREF(tmp);
if (r < 0)
PyErr_Clear();
return r > 0;
}
static int
flush_std_files(void)
{
PyObject *fout = _PySys_GetObjectId(&PyId_stdout);
PyObject *ferr = _PySys_GetObjectId(&PyId_stderr);
PyObject *tmp;
int status = 0;
if (fout != NULL && fout != Py_None && !file_is_closed(fout)) {
tmp = _PyObject_CallMethodId(fout, &PyId_flush, NULL);
if (tmp == NULL) {
PyErr_WriteUnraisable(fout);
status = -1;
}
else
Py_DECREF(tmp);
}
if (ferr != NULL && ferr != Py_None && !file_is_closed(ferr)) {
tmp = _PyObject_CallMethodId(ferr, &PyId_flush, NULL);
if (tmp == NULL) {
PyErr_Clear();
status = -1;
}
else
Py_DECREF(tmp);
}
return status;
}
/* Undo the effect of Py_Initialize().
Beware: if multiple interpreter and/or thread states exist, these
are not wiped out; only the current thread and interpreter state
are deleted. But since everything else is deleted, those other
interpreter and thread states should no longer be used.
(XXX We should do better, e.g. wipe out all interpreters and
threads.)
Locking: as above.
*/
int
Py_FinalizeEx(void)
{
PyInterpreterState *interp;
PyThreadState *tstate;
int status = 0;
if (!_PyRuntime.initialized)
return status;
wait_for_thread_shutdown();
/* The interpreter is still entirely intact at this point, and the
* exit funcs may be relying on that. In particular, if some thread
* or exit func is still waiting to do an import, the import machinery
* expects Py_IsInitialized() to return true. So don't say the
* interpreter is uninitialized until after the exit funcs have run.
* Note that Threading.py uses an exit func to do a join on all the
* threads created thru it, so this also protects pending imports in
* the threads created via Threading.
*/
call_py_exitfuncs();
/* Get current thread state and interpreter pointer */
tstate = PyThreadState_GET();
interp = tstate->interp;
/* Remaining threads (e.g. daemon threads) will automatically exit
after taking the GIL (in PyEval_RestoreThread()). */
_PyRuntime.finalizing = tstate;
_PyRuntime.initialized = 0;
_PyRuntime.core_initialized = 0;
/* Flush sys.stdout and sys.stderr */
if (flush_std_files() < 0) {
status = -1;
}
/* Disable signal handling */
PyOS_FiniInterrupts();
/* Collect garbage. This may call finalizers; it's nice to call these
* before all modules are destroyed.
* XXX If a __del__ or weakref callback is triggered here, and tries to
* XXX import a module, bad things can happen, because Python no
* XXX longer believes it's initialized.
* XXX Fatal Python error: Interpreter not initialized (version mismatch?)
* XXX is easy to provoke that way. I've also seen, e.g.,
* XXX Exception exceptions.ImportError: 'No module named sha'
* XXX in <function callback at 0x008F5718> ignored
* XXX but I'm unclear on exactly how that one happens. In any case,
* XXX I haven't seen a real-life report of either of these.
*/