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gh-112660: Do not clear arbitrary errors on import#112661

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,2 @@
Do not clear unexpected errors during formatting error messages for
ImportError and AttributeError for modules.
57 changes: 25 additions & 32 deletionsObjects/moduleobject.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -749,27 +749,20 @@ module_repr(PyModuleObject *m)
}

/* Check if the "_initializing" attribute of the module spec is set to true.
Clear the exception and return 0 if spec is NULL.
*/
int
_PyModuleSpec_IsInitializing(PyObject *spec)
{
if (spec != NULL) {
PyObject *value;
int ok = PyObject_GetOptionalAttr(spec, &_Py_ID(_initializing), &value);
if (ok == 0) {
return 0;
}
if (value != NULL) {
int initializing = PyObject_IsTrue(value);
Py_DECREF(value);
if (initializing >= 0) {
return initializing;
}
}
if (spec == NULL) {
return 0;
}
PyErr_Clear();
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
Expand All@@ -782,17 +775,13 @@ _PyModuleSpec_IsUninitializedSubmodule(PyObject *spec, PyObject *name)
return 0;
}

PyObject *value = PyObject_GetAttr(spec, &_Py_ID(_uninitialized_submodules));
if (value == 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);
}

int is_uninitialized = PySequence_Contains(value, name);
Py_DECREF(value);
if (is_uninitialized == -1) {
return 0;
}
return is_uninitialized;
return rc;
}

PyObject*
Expand DownExpand Up@@ -840,23 +829,27 @@ _Py_module_getattro_impl(PyModuleObject *m, PyObject *name, int suppress)
return NULL;
}
if (suppress != 1) {
if (_PyModuleSpec_IsInitializing(spec)) {
int rc = _PyModuleSpec_IsInitializing(spec);
if (rc > 0) {
PyErr_Format(PyExc_AttributeError,
"partially initialized "
"module '%U' has no attribute '%U' "
"(most likely due to a circular import)",
mod_name, name);
}
else if (_PyModuleSpec_IsUninitializedSubmodule(spec, name)) {
PyErr_Format(PyExc_AttributeError,
else if (rc == 0) {
rc = _PyModuleSpec_IsUninitializedSubmodule(spec, name);
if (rc > 0) {
PyErr_Format(PyExc_AttributeError,
"cannot access submodule '%U' of module '%U' "
"(most likely due to a circular import)",
name, mod_name);
}
else {
PyErr_Format(PyExc_AttributeError,
}
else if (rc == 0) {
PyErr_Format(PyExc_AttributeError,
"module '%U' has no attribute '%U'",
mod_name, name);
}
}
}
Py_XDECREF(spec);
Expand Down
46 changes: 31 additions & 15 deletionsPython/ceval.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -2614,11 +2614,10 @@ import_from(PyThreadState *tstate, PyObject *v, PyObject *name)
/* Issue #17636: in case this failed because of a circular relative
import, try to fallback on reading the module directly from
sys.modules. */
pkgname = PyObject_GetAttr(v, &_Py_ID(__name__));
if (pkgname == NULL) {
goto error;
if (PyObject_GetOptionalAttr(v, &_Py_ID(__name__), &pkgname) < 0) {
return NULL;
}
if (!PyUnicode_Check(pkgname)) {
if (pkgname == NULL ||!PyUnicode_Check(pkgname)) {
Py_CLEAR(pkgname);
goto error;
}
Expand All@@ -2635,42 +2634,59 @@ import_from(PyThreadState *tstate, PyObject *v, PyObject *name)
Py_DECREF(pkgname);
return x;
error:
pkgpath = PyModule_GetFilenameObject(v);
if (pkgname == NULL) {
pkgname_or_unknown = PyUnicode_FromString("<unknown module name>");
if (pkgname_or_unknown == NULL) {
Py_XDECREF(pkgpath);
return NULL;
}
} else {
pkgname_or_unknown = pkgname;
}

pkgpath = NULL;
if (PyModule_Check(v)) {
pkgpath = PyModule_GetFilenameObject(v);
if (pkgpath == NULL) {
if (!PyErr_ExceptionMatches(PyExc_SystemError)) {
Py_DECREF(pkgname_or_unknown);
return NULL;
}
// module filename missing
_PyErr_Clear(tstate);
}
}
if (pkgpath == NULL || !PyUnicode_Check(pkgpath)) {
_PyErr_Clear(tstate);
Py_CLEAR(pkgpath);
errmsg = PyUnicode_FromFormat(
"cannot import name %R from %R (unknown location)",
name, pkgname_or_unknown
);
/* NULL checks for errmsg and pkgname done by PyErr_SetImportError. */
_PyErr_SetImportErrorWithNameFrom(errmsg, pkgname, NULL, name);
}
else {
PyObject *spec = PyObject_GetAttr(v, &_Py_ID(__spec__));
PyObject *spec;
int rc = PyObject_GetOptionalAttr(v, &_Py_ID(__spec__), &spec);
if (rc > 0) {
rc = _PyModuleSpec_IsInitializing(spec);
Py_DECREF(spec);
}
if (rc < 0) {
Py_DECREF(pkgname_or_unknown);
Py_DECREF(pkgpath);
return NULL;
}
const char *fmt =
_PyModuleSpec_IsInitializing(spec) ?
rc ?
"cannot import name %R from partially initialized module %R "
"(most likely due to a circular import) (%S)" :
"cannot import name %R from %R (%S)";
Py_XDECREF(spec);

errmsg = PyUnicode_FromFormat(fmt, name, pkgname_or_unknown, pkgpath);
/* NULL checks for errmsg and pkgname done by PyErr_SetImportError. */
_PyErr_SetImportErrorWithNameFrom(errmsg, pkgname, pkgpath, name);
}
/* NULL checks for errmsg and pkgname done by PyErr_SetImportError. */
_PyErr_SetImportErrorWithNameFrom(errmsg, pkgname, pkgpath, name);

Py_XDECREF(errmsg);
Py_XDECREF(pkgname_or_unknown);
Py_DECREF(pkgname_or_unknown);
Py_XDECREF(pkgpath);
return NULL;
}
Expand Down
25 changes: 14 additions & 11 deletionsPython/import.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -252,18 +252,21 @@ import_ensure_initialized(PyInterpreterState *interp, PyObject *mod, PyObject *n
NOTE: because of this, initializing must be set *before*
stuffing the new module in sys.modules.
*/
spec = PyObject_GetAttr(mod, &_Py_ID(__spec__));
int busy = _PyModuleSpec_IsInitializing(spec);
Py_XDECREF(spec);
if (busy) {
/* Wait until module is done importing. */
PyObject *value = PyObject_CallMethodOneArg(
IMPORTLIB(interp), &_Py_ID(_lock_unlock_module), name);
if (value == NULL) {
return -1;
}
Py_DECREF(value);
int rc = PyObject_GetOptionalAttr(mod, &_Py_ID(__spec__), &spec);
if (rc > 0) {
rc = _PyModuleSpec_IsInitializing(spec);
Py_DECREF(spec);
}
if (rc <= 0) {
return rc;
}
/* Wait until module is done importing. */
PyObject *value = PyObject_CallMethodOneArg(
IMPORTLIB(interp), &_Py_ID(_lock_unlock_module), name);
if (value == NULL) {
return -1;
}
Py_DECREF(value);
return 0;
}

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