#include "Python.h" #include "pycore_initconfig.h" #include "pycore_interp.h" // PyInterpreterState.warnings #include "pycore_long.h" // _PyLong_GetZero() #include "pycore_pyerrors.h" #include "pycore_pystate.h" // _PyThreadState_GET() #include "frameobject.h" // PyFrame_GetBack() #include "clinic/_warnings.c.h" #define MODULE_NAME "_warnings" PyDoc_STRVAR(warnings__doc__, MODULE_NAME " provides basic warning filtering support.\n" "It is a helper module to speed up interpreter start-up."); _Py_IDENTIFIER(stderr); #ifndef Py_DEBUG _Py_IDENTIFIER(default); _Py_IDENTIFIER(ignore); #endif /*************************************************************************/ typedef struct _warnings_runtime_state WarningsState; _Py_IDENTIFIER(__name__); /* Given a module object, get its per-module state. */ static WarningsState * warnings_get_state(void) { PyInterpreterState *interp = _PyInterpreterState_GET(); if (interp == NULL) { PyErr_SetString(PyExc_RuntimeError, "warnings_get_state: could not identify " "current interpreter"); return NULL; } return &interp->warnings; } /* Clear the given warnings module state. */ static void warnings_clear_state(WarningsState *st) { Py_CLEAR(st->filters); Py_CLEAR(st->once_registry); Py_CLEAR(st->default_action); } #ifndef Py_DEBUG static PyObject * create_filter(PyObject *category, _Py_Identifier *id, const char *modname) { PyObject *modname_obj = NULL; PyObject *action_str = _PyUnicode_FromId(id); if (action_str == NULL) { return NULL; } /* Default to "no module name" for initial filter set */ if (modname != NULL) { modname_obj = PyUnicode_InternFromString(modname); if (modname_obj == NULL) { return NULL; } } else { modname_obj = Py_NewRef(Py_None); } /* This assumes the line number is zero for now. */ PyObject *filter = PyTuple_Pack(5, action_str, Py_None, category, modname_obj, _PyLong_GetZero()); Py_DECREF(modname_obj); return filter; } #endif static PyObject * init_filters(void) { #ifdef Py_DEBUG /* Py_DEBUG builds show all warnings by default */ return PyList_New(0); #else /* Other builds ignore a number of warning categories by default */ PyObject *filters = PyList_New(5); if (filters == NULL) { return NULL; } size_t pos = 0; /* Post-incremented in each use. */ PyList_SET_ITEM(filters, pos++, create_filter(PyExc_DeprecationWarning, &PyId_default, "__main__")); PyList_SET_ITEM(filters, pos++, create_filter(PyExc_DeprecationWarning, &PyId_ignore, NULL)); PyList_SET_ITEM(filters, pos++, create_filter(PyExc_PendingDeprecationWarning, &PyId_ignore, NULL)); PyList_SET_ITEM(filters, pos++, create_filter(PyExc_ImportWarning, &PyId_ignore, NULL)); PyList_SET_ITEM(filters, pos++, create_filter(PyExc_ResourceWarning, &PyId_ignore, NULL)); for (size_t x = 0; x < pos; x++) { if (PyList_GET_ITEM(filters, x) == NULL) { Py_DECREF(filters); return NULL; } } return filters; #endif } /* Initialize the given warnings module state. */ int _PyWarnings_InitState(PyInterpreterState *interp) { WarningsState *st = &interp->warnings; if (st->filters == NULL) { st->filters = init_filters(); if (st->filters == NULL) { return -1; } } if (st->once_registry == NULL) { st->once_registry = PyDict_New(); if (st->once_registry == NULL) { return -1; } } if (st->default_action == NULL) { st->default_action = PyUnicode_FromString("default"); if (st->default_action == NULL) { return -1; } } st->filters_version = 0; return 0; } /*************************************************************************/ static int check_matched(PyObject *obj, PyObject *arg) { PyObject *result; _Py_IDENTIFIER(match); int rc; /* A 'None' filter always matches */ if (obj == Py_None) return 1; /* An internal plain text default filter must match exactly */ if (PyUnicode_CheckExact(obj)) { int cmp_result = PyUnicode_Compare(obj, arg); if (cmp_result == -1 && PyErr_Occurred()) { return -1; } return !cmp_result; } /* Otherwise assume a regex filter and call its match() method */ result = _PyObject_CallMethodIdOneArg(obj, &PyId_match, arg); if (result == NULL) return -1; rc = PyObject_IsTrue(result); Py_DECREF(result); return rc; } /* Returns a new reference. A NULL return value can mean false or an error. */ static PyObject * get_warnings_attr(_Py_Identifier *attr_id, int try_import) { PyObject *warnings_str; PyObject *warnings_module, *obj; _Py_IDENTIFIER(warnings); warnings_str = _PyUnicode_FromId(&PyId_warnings); if (warnings_str == NULL) { return NULL; } /* don't try to import after the start of the Python finallization */ if (try_import && !_Py_IsFinalizing()) { warnings_module = PyImport_Import(warnings_str); if (warnings_module == NULL) { /* Fallback to the C implementation if we cannot get the Python implementation */ if (PyErr_ExceptionMatches(PyExc_ImportError)) { PyErr_Clear(); } return NULL; } } else { /* if we're so late into Python finalization that the module dict is gone, then we can't even use PyImport_GetModule without triggering an interpreter abort. */ if (!_PyInterpreterState_GET()->modules) { return NULL; } warnings_module = PyImport_GetModule(warnings_str); if (warnings_module == NULL) return NULL; } (void)_PyObject_LookupAttrId(warnings_module, attr_id, &obj); Py_DECREF(warnings_module); return obj; } static PyObject * get_once_registry(WarningsState *st) { PyObject *registry; _Py_IDENTIFIER(onceregistry); registry = get_warnings_attr(&PyId_onceregistry, 0); if (registry == NULL) { if (PyErr_Occurred()) return NULL; assert(st->once_registry); return st->once_registry; } if (!PyDict_Check(registry)) { PyErr_Format(PyExc_TypeError, MODULE_NAME ".onceregistry must be a dict, " "not '%.200s'", Py_TYPE(registry)->tp_name); Py_DECREF(registry); return NULL; } Py_SETREF(st->once_registry, registry); return registry; } static PyObject * get_default_action(WarningsState *st) { PyObject *default_action; _Py_IDENTIFIER(defaultaction); default_action = get_warnings_attr(&PyId_defaultaction, 0); if (default_action == NULL) { if (PyErr_Occurred()) { return NULL; } assert(st->default_action); return st->default_action; } if (!PyUnicode_Check(default_action)) { PyErr_Format(PyExc_TypeError, MODULE_NAME ".defaultaction must be a string, " "not '%.200s'", Py_TYPE(default_action)->tp_name); Py_DECREF(default_action); return NULL; } Py_SETREF(st->default_action, default_action); return default_action; } /* The item is a new reference. */ static PyObject* get_filter(PyObject *category, PyObject *text, Py_ssize_t lineno, PyObject *module, PyObject **item) { PyObject *action; Py_ssize_t i; PyObject *warnings_filters; _Py_IDENTIFIER(filters); WarningsState *st = warnings_get_state(); if (st == NULL) { return NULL; } warnings_filters = get_warnings_attr(&PyId_filters, 0); if (warnings_filters == NULL) { if (PyErr_Occurred()) return NULL; } else { Py_SETREF(st->filters, warnings_filters); } PyObject *filters = st->filters; if (filters == NULL || !PyList_Check(filters)) { PyErr_SetString(PyExc_ValueError, MODULE_NAME ".filters must be a list"); return NULL; } /* WarningsState.filters could change while we are iterating over it. */ for (i = 0; i < PyList_GET_SIZE(filters); i++) { PyObject *tmp_item, *action, *msg, *cat, *mod, *ln_obj; Py_ssize_t ln; int is_subclass, good_msg, good_mod; tmp_item = PyList_GET_ITEM(filters, i); if (!PyTuple_Check(tmp_item) || PyTuple_GET_SIZE(tmp_item) != 5) { PyErr_Format(PyExc_ValueError, MODULE_NAME ".filters item %zd isn't a 5-tuple", i); return NULL; } /* Python code: action, msg, cat, mod, ln = item */ Py_INCREF(tmp_item); action = PyTuple_GET_ITEM(tmp_item, 0); msg = PyTuple_GET_ITEM(tmp_item, 1); cat = PyTuple_GET_ITEM(tmp_item, 2); mod = PyTuple_GET_ITEM(tmp_item, 3); ln_obj = PyTuple_GET_ITEM(tmp_item, 4); if (!PyUnicode_Check(action)) { PyErr_Format(PyExc_TypeError, "action must be a string, not '%.200s'", Py_TYPE(action)->tp_name); Py_DECREF(tmp_item); return NULL; } good_msg = check_matched(msg, text); if (good_msg == -1) { Py_DECREF(tmp_item); return NULL; } good_mod = check_matched(mod, module); if (good_mod == -1) { Py_DECREF(tmp_item); return NULL; } is_subclass = PyObject_IsSubclass(category, cat); if (is_subclass == -1) { Py_DECREF(tmp_item); return NULL; } ln = PyLong_AsSsize_t(ln_obj); if (ln == -1 && PyErr_Occurred()) { Py_DECREF(tmp_item); return NULL; } if (good_msg && is_subclass && good_mod && (ln == 0 || lineno == ln)) { *item = tmp_item; return action; } Py_DECREF(tmp_item); } action = get_default_action(st); if (action != NULL) { Py_INCREF(Py_None); *item = Py_None; return action; } return NULL; } static int already_warned(PyObject *registry, PyObject *key, int should_set) { PyObject *version_obj, *already_warned; _Py_IDENTIFIER(version); if (key == NULL) return -1; WarningsState *st = warnings_get_state(); if (st == NULL) { return -1; } version_obj = _PyDict_GetItemIdWithError(registry, &PyId_version); if (version_obj == NULL || !PyLong_CheckExact(version_obj) || PyLong_AsLong(version_obj) != st->filters_version) { if (PyErr_Occurred()) { return -1; } PyDict_Clear(registry); version_obj = PyLong_FromLong(st->filters_version); if (version_obj == NULL) return -1; if (_PyDict_SetItemId(registry, &PyId_version, version_obj) < 0) { Py_DECREF(version_obj); return -1; } Py_DECREF(version_obj); } else { already_warned = PyDict_GetItemWithError(registry, key); if (already_warned != NULL) { int rc = PyObject_IsTrue(already_warned); if (rc != 0) return rc; } else if (PyErr_Occurred()) { return -1; } } /* This warning wasn't found in the registry, set it. */ if (should_set) return PyDict_SetItem(registry, key, Py_True); return 0; } /* New reference. */ static PyObject * normalize_module(PyObject *filename) { PyObject *module; int kind; const void *data; Py_ssize_t len; len = PyUnicode_GetLength(filename); if (len < 0) return NULL; if (len == 0) return PyUnicode_FromString(""); kind = PyUnicode_KIND(filename); data = PyUnicode_DATA(filename); /* if filename.endswith(".py"): */ if (len >= 3 && PyUnicode_READ(kind, data, len-3) == '.' && PyUnicode_READ(kind, data, len-2) == 'p' && PyUnicode_READ(kind, data, len-1) == 'y') { module = PyUnicode_Substring(filename, 0, len-3); } else { module = filename; Py_INCREF(module); } return module; } static int update_registry(PyObject *registry, PyObject *text, PyObject *category, int add_zero) { PyObject *altkey; int rc; if (add_zero) altkey = PyTuple_Pack(3, text, category, _PyLong_GetZero()); else altkey = PyTuple_Pack(2, text, category); rc = already_warned(registry, altkey, 1); Py_XDECREF(altkey); return rc; } static void show_warning(PyObject *filename, int lineno, PyObject *text, PyObject *category, PyObject *sourceline) { PyObject *f_stderr; PyObject *name; char lineno_str[128]; PyOS_snprintf(lineno_str, sizeof(lineno_str), ":%d: ", lineno); name = _PyObject_GetAttrId(category, &PyId___name__); if (name == NULL) { goto error; } f_stderr = _PySys_GetObjectId(&PyId_stderr); if (f_stderr == NULL) { fprintf(stderr, "lost sys.stderr\n"); goto error; } /* Print "filename:lineno: category: text\n" */ if (PyFile_WriteObject(filename, f_stderr, Py_PRINT_RAW) < 0) goto error; if (PyFile_WriteString(lineno_str, f_stderr) < 0) goto error; if (PyFile_WriteObject(name, f_stderr, Py_PRINT_RAW) < 0) goto error; if (PyFile_WriteString(": ", f_stderr) < 0) goto error; if (PyFile_WriteObject(text, f_stderr, Py_PRINT_RAW) < 0) goto error; if (PyFile_WriteString("\n", f_stderr) < 0) goto error; Py_CLEAR(name); /* Print " source_line\n" */ if (sourceline) { int kind; const void *data; Py_ssize_t i, len; Py_UCS4 ch; PyObject *truncated; if (PyUnicode_READY(sourceline) < 1) goto error; kind = PyUnicode_KIND(sourceline); data = PyUnicode_DATA(sourceline); len = PyUnicode_GET_LENGTH(sourceline); for (i=0; ico_filename; Py_DECREF(code); if (filename == NULL) { return 0; } if (!PyUnicode_Check(filename)) { return 0; } contains = PyUnicode_Contains(filename, importlib_string); if (contains < 0) { return 0; } else if (contains > 0) { contains = PyUnicode_Contains(filename, bootstrap_string); if (contains < 0) { return 0; } else if (contains > 0) { return 1; } } return 0; } static PyFrameObject * next_external_frame(PyFrameObject *frame) { do { PyFrameObject *back = PyFrame_GetBack(frame); Py_DECREF(frame); frame = back; } while (frame != NULL && is_internal_frame(frame)); return frame; } /* filename, module, and registry are new refs, globals is borrowed */ /* Returns 0 on error (no new refs), 1 on success */ static int setup_context(Py_ssize_t stack_level, PyObject **filename, int *lineno, PyObject **module, PyObject **registry) { _Py_IDENTIFIER(__warningregistry__); PyObject *globals; /* Setup globals, filename and lineno. */ PyThreadState *tstate = _PyThreadState_GET(); PyFrameObject *f = PyThreadState_GetFrame(tstate); // Stack level comparisons to Python code is off by one as there is no // warnings-related stack level to avoid. if (stack_level <= 0 || is_internal_frame(f)) { while (--stack_level > 0 && f != NULL) { PyFrameObject *back = PyFrame_GetBack(f); Py_DECREF(f); f = back; } } else { while (--stack_level > 0 && f != NULL) { f = next_external_frame(f); } } if (f == NULL) { globals = tstate->interp->sysdict; *filename = PyUnicode_FromString("sys"); *lineno = 1; } else { globals = f->f_globals; PyCodeObject *code = PyFrame_GetCode(f); *filename = code->co_filename; Py_DECREF(code); Py_INCREF(*filename); *lineno = PyFrame_GetLineNumber(f); Py_DECREF(f); } *module = NULL; /* Setup registry. */ assert(globals != NULL); assert(PyDict_Check(globals)); *registry = _PyDict_GetItemIdWithError(globals, &PyId___warningregistry__); if (*registry == NULL) { int rc; if (_PyErr_Occurred(tstate)) { goto handle_error; } *registry = PyDict_New(); if (*registry == NULL) goto handle_error; rc = _PyDict_SetItemId(globals, &PyId___warningregistry__, *registry); if (rc < 0) goto handle_error; } else Py_INCREF(*registry); /* Setup module. */ *module = _PyDict_GetItemIdWithError(globals, &PyId___name__); if (*module == Py_None || (*module != NULL && PyUnicode_Check(*module))) { Py_INCREF(*module); } else if (_PyErr_Occurred(tstate)) { goto handle_error; } else { *module = PyUnicode_FromString(""); if (*module == NULL) goto handle_error; } return 1; handle_error: Py_XDECREF(*registry); Py_XDECREF(*module); Py_DECREF(*filename); return 0; } static PyObject * get_category(PyObject *message, PyObject *category) { int rc; /* Get category. */ rc = PyObject_IsInstance(message, PyExc_Warning); if (rc == -1) return NULL; if (rc == 1) category = (PyObject*)Py_TYPE(message); else if (category == NULL || category == Py_None) category = PyExc_UserWarning; /* Validate category. */ rc = PyObject_IsSubclass(category, PyExc_Warning); /* category is not a subclass of PyExc_Warning or PyObject_IsSubclass raised an error */ if (rc == -1 || rc == 0) { PyErr_Format(PyExc_TypeError, "category must be a Warning subclass, not '%s'", Py_TYPE(category)->tp_name); return NULL; } return category; } static PyObject * do_warn(PyObject *message, PyObject *category, Py_ssize_t stack_level, PyObject *source) { PyObject *filename, *module, *registry, *res; int lineno; if (!setup_context(stack_level, &filename, &lineno, &module, ®istry)) return NULL; res = warn_explicit(category, message, filename, lineno, module, registry, NULL, source); Py_DECREF(filename); Py_DECREF(registry); Py_DECREF(module); return res; } /*[clinic input] warn as warnings_warn message: object category: object = None stacklevel: Py_ssize_t = 1 source: object = None Issue a warning, or maybe ignore it or raise an exception. [clinic start generated code]*/ static PyObject * warnings_warn_impl(PyObject *module, PyObject *message, PyObject *category, Py_ssize_t stacklevel, PyObject *source) /*[clinic end generated code: output=31ed5ab7d8d760b2 input=bfdf5cf99f6c4edd]*/ { category = get_category(message, category); if (category == NULL) return NULL; return do_warn(message, category, stacklevel, source); } static PyObject * get_source_line(PyObject *module_globals, int lineno) { _Py_IDENTIFIER(get_source); _Py_IDENTIFIER(__loader__); PyObject *loader; PyObject *module_name; PyObject *get_source; PyObject *source; PyObject *source_list; PyObject *source_line; /* Check/get the requisite pieces needed for the loader. */ loader = _PyDict_GetItemIdWithError(module_globals, &PyId___loader__); if (loader == NULL) { return NULL; } Py_INCREF(loader); module_name = _PyDict_GetItemIdWithError(module_globals, &PyId___name__); if (!module_name) { Py_DECREF(loader); return NULL; } Py_INCREF(module_name); /* Make sure the loader implements the optional get_source() method. */ (void)_PyObject_LookupAttrId(loader, &PyId_get_source, &get_source); Py_DECREF(loader); if (!get_source) { Py_DECREF(module_name); return NULL; } /* Call get_source() to get the source code. */ source = PyObject_CallOneArg(get_source, module_name); Py_DECREF(get_source); Py_DECREF(module_name); if (!source) { return NULL; } if (source == Py_None) { Py_DECREF(source); return NULL; } /* Split the source into lines. */ source_list = PyUnicode_Splitlines(source, 0); Py_DECREF(source); if (!source_list) { return NULL; } /* Get the source line. */ source_line = PyList_GetItem(source_list, lineno-1); Py_XINCREF(source_line); Py_DECREF(source_list); return source_line; } static PyObject * warnings_warn_explicit(PyObject *self, PyObject *args, PyObject *kwds) { static char *kwd_list[] = {"message", "category", "filename", "lineno", "module", "registry", "module_globals", "source", 0}; PyObject *message; PyObject *category; PyObject *filename; int lineno; PyObject *module = NULL; PyObject *registry = NULL; PyObject *module_globals = NULL; PyObject *sourceobj = NULL; PyObject *source_line = NULL; PyObject *returned; if (!PyArg_ParseTupleAndKeywords(args, kwds, "OOUi|OOOO:warn_explicit", kwd_list, &message, &category, &filename, &lineno, &module, ®istry, &module_globals, &sourceobj)) return NULL; if (module_globals && module_globals != Py_None) { if (!PyDict_Check(module_globals)) { PyErr_Format(PyExc_TypeError, "module_globals must be a dict, not '%.200s'", Py_TYPE(module_globals)->tp_name); return NULL; } source_line = get_source_line(module_globals, lineno); if (source_line == NULL && PyErr_Occurred()) { return NULL; } } returned = warn_explicit(category, message, filename, lineno, module, registry, source_line, sourceobj); Py_XDECREF(source_line); return returned; } static PyObject * warnings_filters_mutated(PyObject *self, PyObject *args) { WarningsState *st = warnings_get_state(); if (st == NULL) { return NULL; } st->filters_version++; Py_RETURN_NONE; } /* Function to issue a warning message; may raise an exception. */ static int warn_unicode(PyObject *category, PyObject *message, Py_ssize_t stack_level, PyObject *source) { PyObject *res; if (category == NULL) category = PyExc_RuntimeWarning; res = do_warn(message, category, stack_level, source); if (res == NULL) return -1; Py_DECREF(res); return 0; } static int _PyErr_WarnFormatV(PyObject *source, PyObject *category, Py_ssize_t stack_level, const char *format, va_list vargs) { PyObject *message; int res; message = PyUnicode_FromFormatV(format, vargs); if (message == NULL) return -1; res = warn_unicode(category, message, stack_level, source); Py_DECREF(message); return res; } int PyErr_WarnFormat(PyObject *category, Py_ssize_t stack_level, const char *format, ...) { int res; va_list vargs; #ifdef HAVE_STDARG_PROTOTYPES va_start(vargs, format); #else va_start(vargs); #endif res = _PyErr_WarnFormatV(NULL, category, stack_level, format, vargs); va_end(vargs); return res; } static int _PyErr_WarnFormat(PyObject *source, PyObject *category, Py_ssize_t stack_level, const char *format, ...) { int res; va_list vargs; #ifdef HAVE_STDARG_PROTOTYPES va_start(vargs, format); #else va_start(vargs); #endif res = _PyErr_WarnFormatV(source, category, stack_level, format, vargs); va_end(vargs); return res; } int PyErr_ResourceWarning(PyObject *source, Py_ssize_t stack_level, const char *format, ...) { int res; va_list vargs; #ifdef HAVE_STDARG_PROTOTYPES va_start(vargs, format); #else va_start(vargs); #endif res = _PyErr_WarnFormatV(source, PyExc_ResourceWarning, stack_level, format, vargs); va_end(vargs); return res; } int PyErr_WarnEx(PyObject *category, const char *text, Py_ssize_t stack_level) { int ret; PyObject *message = PyUnicode_FromString(text); if (message == NULL) return -1; ret = warn_unicode(category, message, stack_level, NULL); Py_DECREF(message); return ret; } /* PyErr_Warn is only for backwards compatibility and will be removed. Use PyErr_WarnEx instead. */ #undef PyErr_Warn int PyErr_Warn(PyObject *category, const char *text) { return PyErr_WarnEx(category, text, 1); } /* Warning with explicit origin */ int PyErr_WarnExplicitObject(PyObject *category, PyObject *message, PyObject *filename, int lineno, PyObject *module, PyObject *registry) { PyObject *res; if (category == NULL) category = PyExc_RuntimeWarning; res = warn_explicit(category, message, filename, lineno, module, registry, NULL, NULL); if (res == NULL) return -1; Py_DECREF(res); return 0; } int PyErr_WarnExplicit(PyObject *category, const char *text, const char *filename_str, int lineno, const char *module_str, PyObject *registry) { PyObject *message = PyUnicode_FromString(text); PyObject *filename = PyUnicode_DecodeFSDefault(filename_str); PyObject *module = NULL; int ret = -1; if (message == NULL || filename == NULL) goto exit; if (module_str != NULL) { module = PyUnicode_FromString(module_str); if (module == NULL) goto exit; } ret = PyErr_WarnExplicitObject(category, message, filename, lineno, module, registry); exit: Py_XDECREF(message); Py_XDECREF(module); Py_XDECREF(filename); return ret; } int PyErr_WarnExplicitFormat(PyObject *category, const char *filename_str, int lineno, const char *module_str, PyObject *registry, const char *format, ...) { PyObject *message; PyObject *module = NULL; PyObject *filename = PyUnicode_DecodeFSDefault(filename_str); int ret = -1; va_list vargs; if (filename == NULL) goto exit; if (module_str != NULL) { module = PyUnicode_FromString(module_str); if (module == NULL) goto exit; } #ifdef HAVE_STDARG_PROTOTYPES va_start(vargs, format); #else va_start(vargs); #endif message = PyUnicode_FromFormatV(format, vargs); if (message != NULL) { PyObject *res; res = warn_explicit(category, message, filename, lineno, module, registry, NULL, NULL); Py_DECREF(message); if (res != NULL) { Py_DECREF(res); ret = 0; } } va_end(vargs); exit: Py_XDECREF(module); Py_XDECREF(filename); return ret; } void _PyErr_WarnUnawaitedCoroutine(PyObject *coro) { /* First, we attempt to funnel the warning through warnings._warn_unawaited_coroutine. This could raise an exception, due to: - a bug - some kind of shutdown-related brokenness - succeeding, but with an "error" warning filter installed, so the warning is converted into a RuntimeWarning exception In the first two cases, we want to print the error (so we know what it is!), and then print a warning directly as a fallback. In the last case, we want to print the error (since it's the warning!), but *not* do a fallback. And after we print the error we can't check for what type of error it was (because PyErr_WriteUnraisable clears it), so we need a flag to keep track. Since this is called from __del__ context, it's careful to never raise an exception. */ _Py_IDENTIFIER(_warn_unawaited_coroutine); int warned = 0; PyObject *fn = get_warnings_attr(&PyId__warn_unawaited_coroutine, 1); if (fn) { PyObject *res = PyObject_CallOneArg(fn, coro); Py_DECREF(fn); if (res || PyErr_ExceptionMatches(PyExc_RuntimeWarning)) { warned = 1; } Py_XDECREF(res); } if (PyErr_Occurred()) { PyErr_WriteUnraisable(coro); } if (!warned) { if (_PyErr_WarnFormat(coro, PyExc_RuntimeWarning, 1, "coroutine '%S' was never awaited", ((PyCoroObject *)coro)->cr_qualname) < 0) { PyErr_WriteUnraisable(coro); } } } PyDoc_STRVAR(warn_explicit_doc, "Low-level interface to warnings functionality."); static PyMethodDef warnings_functions[] = { WARNINGS_WARN_METHODDEF {"warn_explicit", (PyCFunction)(void(*)(void))warnings_warn_explicit, METH_VARARGS | METH_KEYWORDS, warn_explicit_doc}, {"_filters_mutated", (PyCFunction)warnings_filters_mutated, METH_NOARGS, NULL}, /* XXX(brett.cannon): add showwarning? */ /* XXX(brett.cannon): Reasonable to add formatwarning? */ {NULL, NULL} /* sentinel */ }; static int warnings_module_exec(PyObject *module) { WarningsState *st = warnings_get_state(); if (st == NULL) { return -1; } if (PyModule_AddObjectRef(module, "filters", st->filters) < 0) { return -1; } if (PyModule_AddObjectRef(module, "_onceregistry", st->once_registry) < 0) { return -1; } if (PyModule_AddObjectRef(module, "_defaultaction", st->default_action) < 0) { return -1; } return 0; } static PyModuleDef_Slot warnings_slots[] = { {Py_mod_exec, warnings_module_exec}, {0, NULL} }; static struct PyModuleDef warnings_module = { PyModuleDef_HEAD_INIT, .m_name = MODULE_NAME, .m_doc = warnings__doc__, .m_size = 0, .m_methods = warnings_functions, .m_slots = warnings_slots, }; PyMODINIT_FUNC _PyWarnings_Init(void) { return PyModuleDef_Init(&warnings_module); } // We need this to ensure that warnings still work until late in finalization. void _PyWarnings_Fini(PyInterpreterState *interp) { warnings_clear_state(&interp->warnings); }