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GeezerVison is showing github.com — cpython/Objects/moduleobject.c at 3.13 · python/cpython Expand file tree/ Copy pathmoduleobject.cMore file actions 1256 lines (1142 loc) · 36.2 KB / Copy pathmoduleobject.cFile metadata and controls1256 lines (1142 loc) · 36.2 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 /* Module object implementation */ #include "Python.h" #include "pycore_call.h" // _PyObject_CallNoArgs() #include "pycore_fileutils.h" // _Py_wgetcwd #include "pycore_interp.h" // PyInterpreterState.importlib #include "pycore_modsupport.h" // _PyModule_CreateInitialized() #include "pycore_moduleobject.h" // _PyModule_GetDef() #include "pycore_object.h" // _PyType_AllocNoTrack #include "pycore_pyerrors.h" // _PyErr_FormatFromCause() #include "pycore_pystate.h" // _PyInterpreterState_GET() #include "pycore_sysmodule.h" // _PySys_GetOptionalAttrString() #include "pycore_weakref.h" // FT_CLEAR_WEAKREFS() #include "osdefs.h" // MAXPATHLEN static PyMemberDef module_members[] = { {"__dict__", _Py_T_OBJECT, offsetof(PyModuleObject, md_dict), Py_READONLY}, {0} }; PyTypeObject PyModuleDef_Type = { PyVarObject_HEAD_INIT(&PyType_Type, 0) "moduledef", /* tp_name */ sizeof(PyModuleDef), /* tp_basicsize */ 0, /* tp_itemsize */ }; int _PyModule_IsExtension(PyObject *obj) { if (!PyModule_Check(obj)) { return 0; } PyModuleObject *module = (PyModuleObject*)obj; PyModuleDef *def = module->md_def; return (def != NULL && def->m_methods != NULL); } PyObject* PyModuleDef_Init(PyModuleDef* def) { assert(PyModuleDef_Type.tp_flags & Py_TPFLAGS_READY); if (def->m_base.m_index == 0) { Py_SET_REFCNT(def, 1); Py_SET_TYPE(def, &PyModuleDef_Type); def->m_base.m_index = _PyImport_GetNextModuleIndex(); } return (PyObject*)def; } static int module_init_dict(PyModuleObject *mod, PyObject *md_dict, PyObject *name, PyObject *doc) { assert(md_dict != NULL); if (doc == NULL) doc = Py_None; if (PyDict_SetItem(md_dict, &_Py_ID(__name__), name) != 0) return -1; if (PyDict_SetItem(md_dict, &_Py_ID(__doc__), doc) != 0) return -1; if (PyDict_SetItem(md_dict, &_Py_ID(__package__), Py_None) != 0) return -1; if (PyDict_SetItem(md_dict, &_Py_ID(__loader__), Py_None) != 0) return -1; if (PyDict_SetItem(md_dict, &_Py_ID(__spec__), Py_None) != 0) return -1; if (PyUnicode_CheckExact(name)) { Py_XSETREF(mod->md_name, Py_NewRef(name)); } return 0; } static PyModuleObject * new_module_notrack(PyTypeObject *mt) { PyModuleObject *m; m = (PyModuleObject *)_PyType_AllocNoTrack(mt, 0); if (m == NULL) return NULL; m->md_def = NULL; m->md_state = NULL; m->md_weaklist = NULL; m->md_name = NULL; m->md_dict = PyDict_New(); if (m->md_dict == NULL) { Py_DECREF(m); return NULL; } return m; } static void track_module(PyModuleObject *m) { _PyObject_SetDeferredRefcount(m->md_dict); PyObject_GC_Track(m->md_dict); _PyObject_SetDeferredRefcount((PyObject *)m); PyObject_GC_Track(m); } static PyObject * new_module(PyTypeObject *mt, PyObject *args, PyObject *kws) { PyModuleObject *m = new_module_notrack(mt); if (m != NULL) { track_module(m); } return (PyObject *)m; } PyObject * PyModule_NewObject(PyObject *name) { PyModuleObject *m = new_module_notrack(&PyModule_Type); if (m == NULL) return NULL; if (module_init_dict(m, m->md_dict, name, NULL) != 0) goto fail; track_module(m); return (PyObject *)m; fail: Py_DECREF(m); return NULL; } PyObject * PyModule_New(const char *name) { PyObject *nameobj, *module; nameobj = PyUnicode_FromString(name); if (nameobj == NULL) return NULL; module = PyModule_NewObject(nameobj); Py_DECREF(nameobj); return module; } /* Check API/ABI version * Issues a warning on mismatch, which is usually not fatal. * Returns 0 if an exception is raised. */ static int check_api_version(const char *name, int module_api_version) { if (module_api_version != PYTHON_API_VERSION && module_api_version != PYTHON_ABI_VERSION) { int err; err = PyErr_WarnFormat(PyExc_RuntimeWarning, 1, "Python C API version mismatch for module %.100s: " "This Python has API version %d, module %.100s has version %d.", name, PYTHON_API_VERSION, name, module_api_version); if (err) return 0; } return 1; } static int _add_methods_to_object(PyObject *module, PyObject *name, PyMethodDef *functions) { PyObject *func; PyMethodDef *fdef; for (fdef = functions; fdef->ml_name != NULL; fdef++) { if ((fdef->ml_flags & METH_CLASS) || (fdef->ml_flags & METH_STATIC)) { PyErr_SetString(PyExc_ValueError, "module functions cannot set" " METH_CLASS or METH_STATIC"); return -1; } func = PyCFunction_NewEx(fdef, (PyObject*)module, name); if (func == NULL) { return -1; } _PyObject_SetDeferredRefcount(func); if (PyObject_SetAttrString(module, fdef->ml_name, func) != 0) { Py_DECREF(func); return -1; } Py_DECREF(func); } return 0; } PyObject * PyModule_Create2(PyModuleDef* module, int module_api_version) { if (!_PyImport_IsInitialized(_PyInterpreterState_GET())) { PyErr_SetString(PyExc_SystemError, "Python import machinery not initialized"); return NULL; } return _PyModule_CreateInitialized(module, module_api_version); } PyObject * _PyModule_CreateInitialized(PyModuleDef* module, int module_api_version) { const char* name; PyModuleObject *m; if (!PyModuleDef_Init(module)) return NULL; name = module->m_name; if (!check_api_version(name, module_api_version)) { return NULL; } if (module->m_slots) { PyErr_Format( PyExc_SystemError, "module %s: PyModule_Create is incompatible with m_slots", name); return NULL; } name = _PyImport_ResolveNameWithPackageContext(name); if ((m = (PyModuleObject*)PyModule_New(name)) == NULL) return NULL; if (module->m_size > 0) { m->md_state = PyMem_Malloc(module->m_size); if (!m->md_state) { PyErr_NoMemory(); Py_DECREF(m); return NULL; } memset(m->md_state, 0, module->m_size); } if (module->m_methods != NULL) { if (PyModule_AddFunctions((PyObject *) m, module->m_methods) != 0) { Py_DECREF(m); return NULL; } } if (module->m_doc != NULL) { if (PyModule_SetDocString((PyObject *) m, module->m_doc) != 0) { Py_DECREF(m); return NULL; } } m->md_def = module; #ifdef Py_GIL_DISABLED m->md_gil = Py_MOD_GIL_USED; #endif return (PyObject*)m; } PyObject * PyModule_FromDefAndSpec2(PyModuleDef* def, PyObject *spec, int module_api_version) { PyModuleDef_Slot* cur_slot; PyObject *(*create)(PyObject *, PyModuleDef*) = NULL; PyObject *nameobj; PyObject *m = NULL; int has_multiple_interpreters_slot = 0; void *multiple_interpreters = (void *)0; int has_gil_slot = 0; void *gil_slot = Py_MOD_GIL_USED; int has_execution_slots = 0; const char *name; int ret; PyInterpreterState *interp = _PyInterpreterState_GET(); PyModuleDef_Init(def); nameobj = PyObject_GetAttrString(spec, "name"); if (nameobj == NULL) { return NULL; } name = PyUnicode_AsUTF8(nameobj); if (name == NULL) { goto error; } if (!check_api_version(name, module_api_version)) { goto error; } if (def->m_size < 0) { PyErr_Format( PyExc_SystemError, "module %s: m_size may not be negative for multi-phase initialization", name); goto error; } for (cur_slot = def->m_slots; cur_slot && cur_slot->slot; cur_slot++) { switch (cur_slot->slot) { case Py_mod_create: if (create) { PyErr_Format( PyExc_SystemError, "module %s has multiple create slots", name); goto error; } create = cur_slot->value; break; case Py_mod_exec: has_execution_slots = 1; break; case Py_mod_multiple_interpreters: if (has_multiple_interpreters_slot) { PyErr_Format( PyExc_SystemError, "module %s has more than one 'multiple interpreters' slots", name); goto error; } multiple_interpreters = cur_slot->value; has_multiple_interpreters_slot = 1; break; case Py_mod_gil: if (has_gil_slot) { PyErr_Format( PyExc_SystemError, "module %s has more than one 'gil' slot", name); goto error; } gil_slot = cur_slot->value; has_gil_slot = 1; break; default: assert(cur_slot->slot < 0 || cur_slot->slot > _Py_mod_LAST_SLOT); PyErr_Format( PyExc_SystemError, "module %s uses unknown slot ID %i", name, cur_slot->slot); goto error; } } /* By default, multi-phase init modules are expected to work under multiple interpreters. */ if (!has_multiple_interpreters_slot) { multiple_interpreters = Py_MOD_MULTIPLE_INTERPRETERS_SUPPORTED; } if (multiple_interpreters == Py_MOD_MULTIPLE_INTERPRETERS_NOT_SUPPORTED) { if (!_Py_IsMainInterpreter(interp) && _PyImport_CheckSubinterpIncompatibleExtensionAllowed(name) < 0) { goto error; } } else if (multiple_interpreters != Py_MOD_PER_INTERPRETER_GIL_SUPPORTED && interp->ceval.own_gil && !_Py_IsMainInterpreter(interp) && _PyImport_CheckSubinterpIncompatibleExtensionAllowed(name) < 0) { goto error; } if (create) { m = create(spec, def); if (m == NULL) { if (!PyErr_Occurred()) { PyErr_Format( PyExc_SystemError, "creation of module %s failed without setting an exception", name); } goto error; } else { if (PyErr_Occurred()) { _PyErr_FormatFromCause( PyExc_SystemError, "creation of module %s raised unreported exception", name); goto error; } } } else { m = PyModule_NewObject(nameobj); if (m == NULL) { goto error; } } if (PyModule_Check(m)) { ((PyModuleObject*)m)->md_state = NULL; ((PyModuleObject*)m)->md_def = def; #ifdef Py_GIL_DISABLED ((PyModuleObject*)m)->md_gil = gil_slot; #else (void)gil_slot; #endif } else { if (def->m_size > 0 || def->m_traverse || def->m_clear || def->m_free) { PyErr_Format( PyExc_SystemError, "module %s is not a module object, but requests module state", name); goto error; } if (has_execution_slots) { PyErr_Format( PyExc_SystemError, "module %s specifies execution slots, but did not create " "a ModuleType instance", name); goto error; } } if (def->m_methods != NULL) { ret = _add_methods_to_object(m, nameobj, def->m_methods); if (ret != 0) { goto error; } } if (def->m_doc != NULL) { ret = PyModule_SetDocString(m, def->m_doc); if (ret != 0) { goto error; } } Py_DECREF(nameobj); return m; error: Py_DECREF(nameobj); Py_XDECREF(m); return NULL; } #ifdef Py_GIL_DISABLED int PyUnstable_Module_SetGIL(PyObject *module, void *gil) { if (!PyModule_Check(module)) { PyErr_BadInternalCall(); return -1; } ((PyModuleObject *)module)->md_gil = gil; return 0; } #endif int PyModule_ExecDef(PyObject *module, PyModuleDef *def) { PyModuleDef_Slot *cur_slot; const char *name; int ret; name = PyModule_GetName(module); if (name == NULL) { return -1; } if (def->m_size >= 0) { PyModuleObject *md = (PyModuleObject*)module; if (md->md_state == NULL) { /* Always set a state pointer; this serves as a marker to skip * multiple initialization (importlib.reload() is no-op) */ md->md_state = PyMem_Malloc(def->m_size); if (!md->md_state) { PyErr_NoMemory(); return -1; } memset(md->md_state, 0, def->m_size); } } if (def->m_slots == NULL) { return 0; } for (cur_slot = def->m_slots; cur_slot && cur_slot->slot; cur_slot++) { switch (cur_slot->slot) { case Py_mod_create: /* handled in PyModule_FromDefAndSpec2 */ break; case Py_mod_exec: ret = ((int (*)(PyObject *))cur_slot->value)(module); if (ret != 0) { if (!PyErr_Occurred()) { PyErr_Format( PyExc_SystemError, "execution of module %s failed without setting an exception", name); } return -1; } if (PyErr_Occurred()) { _PyErr_FormatFromCause( PyExc_SystemError, "execution of module %s raised unreported exception", name); return -1; } break; case Py_mod_multiple_interpreters: case Py_mod_gil: /* handled in PyModule_FromDefAndSpec2 */ break; default: PyErr_Format( PyExc_SystemError, "module %s initialized with unknown slot %i", name, cur_slot->slot); return -1; } } return 0; } int PyModule_AddFunctions(PyObject *m, PyMethodDef *functions) { int res; PyObject *name = PyModule_GetNameObject(m); if (name == NULL) { return -1; } res = _add_methods_to_object(m, name, functions); Py_DECREF(name); return res; } int PyModule_SetDocString(PyObject *m, const char *doc) { PyObject *v; v = PyUnicode_FromString(doc); if (v == NULL || PyObject_SetAttr(m, &_Py_ID(__doc__), v) != 0) { Py_XDECREF(v); return -1; } Py_DECREF(v); return 0; } PyObject * PyModule_GetDict(PyObject *m) { if (!PyModule_Check(m)) { PyErr_BadInternalCall(); return NULL; } return _PyModule_GetDict(m); // borrowed reference } PyObject* PyModule_GetNameObject(PyObject *mod) { if (!PyModule_Check(mod)) { PyErr_BadArgument(); return NULL; } PyObject *dict = ((PyModuleObject *)mod)->md_dict; // borrowed reference if (dict == NULL || !PyDict_Check(dict)) { goto error; } PyObject *name; if (PyDict_GetItemRef(dict, &_Py_ID(__name__), &name) <= 0) { // error or not found goto error; } if (!PyUnicode_Check(name)) { Py_DECREF(name); goto error; } return name; error: if (!PyErr_Occurred()) { PyErr_SetString(PyExc_SystemError, "nameless module"); } return NULL; } const char * PyModule_GetName(PyObject *m) { PyObject *name = PyModule_GetNameObject(m); if (name == NULL) { return NULL; } assert(Py_REFCNT(name) >= 2); Py_DECREF(name); /* module dict has still a reference */ return PyUnicode_AsUTF8(name); } PyObject* PyModule_GetFilenameObject(PyObject *mod) { if (!PyModule_Check(mod)) { PyErr_BadArgument(); return NULL; } PyObject *dict = ((PyModuleObject *)mod)->md_dict; // borrowed reference if (dict == NULL) { goto error; } PyObject *fileobj; if (PyDict_GetItemRef(dict, &_Py_ID(__file__), &fileobj) <= 0) { // error or not found goto error; } if (!PyUnicode_Check(fileobj)) { Py_DECREF(fileobj); goto error; } return fileobj; error: if (!PyErr_Occurred()) { PyErr_SetString(PyExc_SystemError, "module filename missing"); } return NULL; } const char * PyModule_GetFilename(PyObject *m) { PyObject *fileobj; const char *utf8; fileobj = PyModule_GetFilenameObject(m); if (fileobj == NULL) return NULL; utf8 = PyUnicode_AsUTF8(fileobj); Py_DECREF(fileobj); /* module dict has still a reference */ return utf8; } PyModuleDef* PyModule_GetDef(PyObject* m) { if (!PyModule_Check(m)) { PyErr_BadArgument(); return NULL; } return _PyModule_GetDef(m); } void* PyModule_GetState(PyObject* m) { if (!PyModule_Check(m)) { PyErr_BadArgument(); return NULL; } return _PyModule_GetState(m); } void _PyModule_Clear(PyObject *m) { PyObject *d = ((PyModuleObject *)m)->md_dict; if (d != NULL) _PyModule_ClearDict(d); } void _PyModule_ClearDict(PyObject *d) { /* To make the execution order of destructors for global objects a bit more predictable, we first zap all objects whose name starts with a single underscore, before we clear the entire dictionary. We zap them by replacing them with None, rather than deleting them from the dictionary, to avoid rehashing the dictionary (to some extent). */ Py_ssize_t pos; PyObject *key, *value; int verbose = _Py_GetConfig()->verbose; /* First, clear only names starting with a single underscore */ pos = 0; while (PyDict_Next(d, &pos, &key, &value)) { if (value != Py_None && PyUnicode_Check(key)) { if (PyUnicode_READ_CHAR(key, 0) == '_' && PyUnicode_READ_CHAR(key, 1) != '_') { if (verbose > 1) { const char *s = PyUnicode_AsUTF8(key); if (s != NULL) PySys_WriteStderr("# clear[1] %s\n", s); else PyErr_Clear(); } if (PyDict_SetItem(d, key, Py_None) != 0) { PyErr_FormatUnraisable("Exception ignored on clearing module dict"); } } } } /* Next, clear all names except for __builtins__ */ pos = 0; while (PyDict_Next(d, &pos, &key, &value)) { if (value != Py_None && PyUnicode_Check(key)) { if (PyUnicode_READ_CHAR(key, 0) != '_' || !_PyUnicode_EqualToASCIIString(key, "__builtins__")) { if (verbose > 1) { const char *s = PyUnicode_AsUTF8(key); if (s != NULL) PySys_WriteStderr("# clear[2] %s\n", s); else PyErr_Clear(); } if (PyDict_SetItem(d, key, Py_None) != 0) { PyErr_FormatUnraisable("Exception ignored on clearing module dict"); } } } } /* Note: we leave __builtins__ in place, so that destructors of non-global objects defined in this module can still use builtins, in particularly 'None'. */ } /*[clinic input] class module "PyModuleObject *" "&PyModule_Type" [clinic start generated code]*/ /*[clinic end generated code: output=da39a3ee5e6b4b0d input=3e35d4f708ecb6af]*/ #include "clinic/moduleobject.c.h" /* Methods */ /*[clinic input] module.__init__ name: unicode doc: object = None Create a module object. The name must be a string; the optional doc argument can have any type. [clinic start generated code]*/ static int module___init___impl(PyModuleObject *self, PyObject *name, PyObject *doc) /*[clinic end generated code: output=e7e721c26ce7aad7 input=57f9e177401e5e1e]*/ { return module_init_dict(self, self->md_dict, name, doc); } static void module_dealloc(PyModuleObject *m) { int verbose = _Py_GetConfig()->verbose; PyObject_GC_UnTrack(m); if (verbose && m->md_name) { PySys_FormatStderr("# destroy %U\n", m->md_name); } FT_CLEAR_WEAKREFS((PyObject *) m, m->md_weaklist); /* bpo-39824: Don't call m_free() if m_size > 0 and md_state=NULL */ if (m->md_def && m->md_def->m_free && (m->md_def->m_size <= 0 || m->md_state != NULL)) { m->md_def->m_free(m); } Py_XDECREF(m->md_dict); Py_XDECREF(m->md_name); if (m->md_state != NULL) PyMem_Free(m->md_state); Py_TYPE(m)->tp_free((PyObject *)m); } static PyObject * module_repr(PyModuleObject *m) { PyInterpreterState *interp = _PyInterpreterState_GET(); return _PyImport_ImportlibModuleRepr(interp, (PyObject *)m); } /* Check if the "_initializing" attribute of the module spec is set to true. */ int _PyModuleSpec_IsInitializing(PyObject *spec) { if (spec == NULL) { return 0; } PyObject *value; int rc = PyObject_GetOptionalAttr(spec, &_Py_ID(_initializing), &value); if (rc > 0) { rc = PyObject_IsTrue(value); Py_DECREF(value); } return rc; } /* Check if the submodule name is in the "_uninitialized_submodules" attribute of the module spec. */ int _PyModuleSpec_IsUninitializedSubmodule(PyObject *spec, PyObject *name) { if (spec == NULL) { return 0; } PyObject *value; int rc = PyObject_GetOptionalAttr(spec, &_Py_ID(_uninitialized_submodules), &value); if (rc > 0) { rc = PySequence_Contains(value, name); Py_DECREF(value); } return rc; } int _PyModuleSpec_GetFileOrigin(PyObject *spec, PyObject **p_origin) { PyObject *has_location = NULL; int rc = PyObject_GetOptionalAttr(spec, &_Py_ID(has_location), &has_location); if (rc <= 0) { return rc; } // If origin is not a location, or doesn't exist, or is not a str, we could consider falling // back to module.__file__. But the cases in which module.__file__ is not __spec__.origin // are cases in which we probably shouldn't be guessing. rc = PyObject_IsTrue(has_location); Py_DECREF(has_location); if (rc <= 0) { return rc; } // has_location is true, so origin is a location PyObject *origin = NULL; rc = PyObject_GetOptionalAttr(spec, &_Py_ID(origin), &origin); if (rc <= 0) { return rc; } assert(origin != NULL); if (!PyUnicode_Check(origin)) { Py_DECREF(origin); return 0; } *p_origin = origin; return 1; } int _PyModule_IsPossiblyShadowing(PyObject *origin) { // origin must be a unicode subtype // Returns 1 if the module at origin could be shadowing a module of the // same name later in the module search path. The condition we check is basically: // root = os.path.dirname(origin.removesuffix(os.sep + "__init__.py")) // return not sys.flags.safe_path and root == (sys.path[0] or os.getcwd()) // Returns 0 otherwise (or if we aren't sure) // Returns -1 if an error occurred that should be propagated if (origin == NULL) { return 0; } // not sys.flags.safe_path const PyConfig *config = _Py_GetConfig(); if (config->safe_path) { return 0; } // root = os.path.dirname(origin.removesuffix(os.sep + "__init__.py")) wchar_t root[MAXPATHLEN + 1]; Py_ssize_t size = PyUnicode_AsWideChar(origin, root, MAXPATHLEN); if (size < 0) { return -1; } assert(size <= MAXPATHLEN); root[size] = L'\0'; wchar_t *sep = wcsrchr(root, SEP); if (sep == NULL) { return 0; } // If it's a package then we need to look one directory further up if (wcscmp(sep + 1, L"__init__.py") == 0) { *sep = L'\0'; sep = wcsrchr(root, SEP); if (sep == NULL) { return 0; } } *sep = L'\0'; // sys.path[0] or os.getcwd() wchar_t *sys_path_0 = config->sys_path_0; if (!sys_path_0) { return 0; } wchar_t sys_path_0_buf[MAXPATHLEN]; if (sys_path_0[0] == L'\0') { // if sys.path[0] == "", treat it as if it were the current directory if (!_Py_wgetcwd(sys_path_0_buf, MAXPATHLEN)) { // If we failed to getcwd, don't raise an exception and instead // let the caller proceed assuming no shadowing return 0; } sys_path_0 = sys_path_0_buf; } int result = wcscmp(sys_path_0, root) == 0; return result; } PyObject* _Py_module_getattro_impl(PyModuleObject *m, PyObject *name, int suppress) { // When suppress=1, this function suppresses AttributeError. PyObject *attr, *mod_name, *getattr; attr = _PyObject_GenericGetAttrWithDict((PyObject *)m, name, NULL, suppress); if (attr) { return attr; } if (suppress == 1) { if (PyErr_Occurred()) { // pass up non-AttributeError exception return NULL; } } else { if (!PyErr_ExceptionMatches(PyExc_AttributeError)) { // pass up non-AttributeError exception return NULL; } PyErr_Clear(); } assert(m->md_dict != NULL); if (PyDict_GetItemRef(m->md_dict, &_Py_ID(__getattr__), &getattr) < 0) { return NULL; } if (getattr) { PyObject *result = PyObject_CallOneArg(getattr, name); if (result == NULL && suppress == 1 && PyErr_ExceptionMatches(PyExc_AttributeError)) { // suppress AttributeError PyErr_Clear(); } Py_DECREF(getattr); return result; } // The attribute was not found. We make a best effort attempt at a useful error message, // but only if we're not suppressing AttributeError. if (suppress == 1) { return NULL; } if (PyDict_GetItemRef(m->md_dict, &_Py_ID(__name__), &mod_name) < 0) { return NULL; } if (!mod_name || !PyUnicode_Check(mod_name)) { Py_XDECREF(mod_name); PyErr_Format(PyExc_AttributeError, "module has no attribute '%U'", name); return NULL; } PyObject *spec; if (PyDict_GetItemRef(m->md_dict, &_Py_ID(__spec__), &spec) < 0) { Py_DECREF(mod_name); return NULL; } if (spec == NULL) { PyErr_Format(PyExc_AttributeError, "module '%U' has no attribute '%U'", mod_name, name); Py_DECREF(mod_name); return NULL; } PyObject *origin = NULL; if (_PyModuleSpec_GetFileOrigin(spec, &origin) < 0) { goto done; } int is_possibly_shadowing = _PyModule_IsPossiblyShadowing(origin); if (is_possibly_shadowing < 0) { goto done; } int is_possibly_shadowing_stdlib = 0; if (is_possibly_shadowing) { PyObject *stdlib_modules; if (_PySys_GetOptionalAttrString("stdlib_module_names", &stdlib_modules) < 0) { goto done; } if (stdlib_modules && PyAnySet_Check(stdlib_modules)) { |
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