moduleobject.c

/* 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"osdefs.h"// MAXPATHLEN


staticPyMemberDefmodule_members[] = {
 {"__dict__", _Py_T_OBJECT, offsetof(PyModuleObject, md_dict), Py_READONLY},
 {0}
};


PyTypeObjectPyModuleDef_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)) {
return0;
 }
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;
}

staticint
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));
 }

return0;
}

staticPyModuleObject*
new_module_notrack(PyTypeObject*mt)
{
PyModuleObject*m;
m= (PyModuleObject*)_PyType_AllocNoTrack(mt, 0);
if (m==NULL)
returnNULL;
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);
returnNULL;
 }
returnm;
}

staticvoid
track_module(PyModuleObject*m)
{
_PyObject_SetDeferredRefcount(m->md_dict);
PyObject_GC_Track(m->md_dict);

_PyObject_SetDeferredRefcount((PyObject*)m);
PyObject_GC_Track(m);
}

staticPyObject*
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)
returnNULL;
if (module_init_dict(m, m->md_dict, name, NULL) !=0)
 goto fail;
track_module(m);
return (PyObject*)m;

fail:
Py_DECREF(m);
returnNULL;
}

PyObject*
PyModule_New(constchar*name)
{
PyObject*nameobj, *module;
nameobj=PyUnicode_FromString(name);
if (nameobj==NULL)
returnNULL;
module=PyModule_NewObject(nameobj);
Py_DECREF(nameobj);
returnmodule;
}

/* Check API/ABI version
 * Issues a warning on mismatch, which is usually not fatal.
 * Returns 0 if an exception is raised.
 */
staticint
check_api_version(constchar*name, intmodule_api_version)
{
if (module_api_version!=PYTHON_API_VERSION&&module_api_version!=PYTHON_ABI_VERSION) {
interr;
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)
return0;
 }
return1;
}

staticint
_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);
 }

return0;
}

PyObject*
PyModule_Create2(PyModuleDef*module, intmodule_api_version)
{
if (!_PyImport_IsInitialized(_PyInterpreterState_GET())) {
PyErr_SetString(PyExc_SystemError,
"Python import machinery not initialized");
returnNULL;
 }
return_PyModule_CreateInitialized(module, module_api_version);
}

PyObject*
_PyModule_CreateInitialized(PyModuleDef*module, intmodule_api_version)
{
constchar*name;
PyModuleObject*m;

if (!PyModuleDef_Init(module))
returnNULL;
name=module->m_name;
if (!check_api_version(name, module_api_version)) {
returnNULL;
 }
if (module->m_slots) {
PyErr_Format(
PyExc_SystemError,
"module %s: PyModule_Create is incompatible with m_slots", name);
returnNULL;
 }
name=_PyImport_ResolveNameWithPackageContext(name);
if ((m= (PyModuleObject*)PyModule_New(name)) ==NULL)
returnNULL;

if (module->m_size>0) {
m->md_state=PyMem_Malloc(module->m_size);
if (!m->md_state) {
PyErr_NoMemory();
Py_DECREF(m);
returnNULL;
 }
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);
returnNULL;
 }
 }
if (module->m_doc!=NULL) {
if (PyModule_SetDocString((PyObject*) m, module->m_doc) !=0) {
Py_DECREF(m);
returnNULL;
 }
 }
m->md_def=module;
#ifdefPy_GIL_DISABLED
m->md_gil=Py_MOD_GIL_USED;
#endif
return (PyObject*)m;
}

PyObject*
PyModule_FromDefAndSpec2(PyModuleDef*def, PyObject*spec, intmodule_api_version)
{
PyModuleDef_Slot*cur_slot;
PyObject*(*create)(PyObject*, PyModuleDef*) =NULL;
PyObject*nameobj;
PyObject*m=NULL;
inthas_multiple_interpreters_slot=0;
void*multiple_interpreters= (void*)0;
inthas_gil_slot=0;
void*gil_slot=Py_MOD_GIL_USED;
inthas_execution_slots=0;
constchar*name;
intret;
PyInterpreterState*interp=_PyInterpreterState_GET();

PyModuleDef_Init(def);

nameobj=PyObject_GetAttrString(spec, "name");
if (nameobj==NULL) {
returnNULL;
 }
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) {
casePy_mod_create:
if (create) {
PyErr_Format(
PyExc_SystemError,
"module %s has multiple create slots",
name);
 goto error;
 }
create=cur_slot->value;
break;
casePy_mod_exec:
has_execution_slots=1;
break;
casePy_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;
casePy_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;
 }
 }
elseif (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;
#ifdefPy_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);
returnm;

error:
Py_DECREF(nameobj);
Py_XDECREF(m);
returnNULL;
}

#ifdefPy_GIL_DISABLED
int
PyUnstable_Module_SetGIL(PyObject*module, void*gil)
{
if (!PyModule_Check(module)) {
PyErr_BadInternalCall();
return-1;
 }
 ((PyModuleObject*)module)->md_gil=gil;
return0;
}
#endif

int
PyModule_ExecDef(PyObject*module, PyModuleDef*def)
{
PyModuleDef_Slot*cur_slot;
constchar*name;
intret;

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) {
return0;
 }

for (cur_slot=def->m_slots; cur_slot&&cur_slot->slot; cur_slot++) {
switch (cur_slot->slot) {
casePy_mod_create:
/* handled in PyModule_FromDefAndSpec2 */
break;
casePy_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;
casePy_mod_multiple_interpreters:
casePy_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;
 }
 }
return0;
}

int
PyModule_AddFunctions(PyObject*m, PyMethodDef*functions)
{
intres;
PyObject*name=PyModule_GetNameObject(m);
if (name==NULL) {
return-1;
 }

res=_add_methods_to_object(m, name, functions);
Py_DECREF(name);
returnres;
}

int
PyModule_SetDocString(PyObject*m, constchar*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);
return0;
}

PyObject*
PyModule_GetDict(PyObject*m)
{
if (!PyModule_Check(m)) {
PyErr_BadInternalCall();
returnNULL;
 }
return_PyModule_GetDict(m); // borrowed reference
}

PyObject*
PyModule_GetNameObject(PyObject*mod)
{
if (!PyModule_Check(mod)) {
PyErr_BadArgument();
returnNULL;
 }
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;
 }
returnname;

error:
if (!PyErr_Occurred()) {
PyErr_SetString(PyExc_SystemError, "nameless module");
 }
returnNULL;
}

constchar*
PyModule_GetName(PyObject*m)
{
PyObject*name=PyModule_GetNameObject(m);
if (name==NULL) {
returnNULL;
 }
assert(Py_REFCNT(name) >= 2);
Py_DECREF(name); /* module dict has still a reference */
returnPyUnicode_AsUTF8(name);
}

PyObject*
PyModule_GetFilenameObject(PyObject*mod)
{
if (!PyModule_Check(mod)) {
PyErr_BadArgument();
returnNULL;
 }
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;
 }
returnfileobj;

error:
if (!PyErr_Occurred()) {
PyErr_SetString(PyExc_SystemError, "module filename missing");
 }
returnNULL;
}

constchar*
PyModule_GetFilename(PyObject*m)
{
PyObject*fileobj;
constchar*utf8;
fileobj=PyModule_GetFilenameObject(m);
if (fileobj==NULL)
returnNULL;
utf8=PyUnicode_AsUTF8(fileobj);
Py_DECREF(fileobj); /* module dict has still a reference */
returnutf8;
}

PyModuleDef*
PyModule_GetDef(PyObject*m)
{
if (!PyModule_Check(m)) {
PyErr_BadArgument();
returnNULL;
 }
return_PyModule_GetDef(m);
}

void*
PyModule_GetState(PyObject*m)
{
if (!PyModule_Check(m)) {
PyErr_BadArgument();
returnNULL;
 }
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_tpos;
PyObject*key, *value;

intverbose=_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) {
constchar*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) {
constchar*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]*/

staticint
module___init___impl(PyModuleObject*self, PyObject*name, PyObject*doc)
/*[clinic end generated code: output=e7e721c26ce7aad7 input=57f9e177401e5e1e]*/
{
returnmodule_init_dict(self, self->md_dict, name, doc);
}

staticvoid
module_dealloc(PyModuleObject*m)
{
intverbose=_Py_GetConfig()->verbose;

PyObject_GC_UnTrack(m);
if (verbose&&m->md_name) {
PySys_FormatStderr("# destroy %U\n", m->md_name);
 }
if (m->md_weaklist!=NULL)
PyObject_ClearWeakRefs((PyObject*) m);
/* 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);
}

staticPyObject*
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) {
return0;
 }
PyObject*value;
intrc=PyObject_GetOptionalAttr(spec, &_Py_ID(_initializing), &value);
if (rc>0) {
rc=PyObject_IsTrue(value);
Py_DECREF(value);
 }
returnrc;
}

/* 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) {
return0;
 }

PyObject*value;
intrc=PyObject_GetOptionalAttr(spec, &_Py_ID(_uninitialized_submodules), &value);
if (rc>0) {
rc=PySequence_Contains(value, name);
Py_DECREF(value);
 }
returnrc;
}

int
_PyModuleSpec_GetFileOrigin(PyObject*spec, PyObject**p_origin)
{
PyObject*has_location=NULL;
intrc=PyObject_GetOptionalAttr(spec, &_Py_ID(has_location), &has_location);
if (rc <= 0) {
returnrc;
 }
// 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) {
returnrc;
 }
// has_location is true, so origin is a location
PyObject*origin=NULL;
rc=PyObject_GetOptionalAttr(spec, &_Py_ID(origin), &origin);
if (rc <= 0) {
returnrc;
 }
assert(origin!=NULL);
if (!PyUnicode_Check(origin)) {
Py_DECREF(origin);
return0;
 }
*p_origin=origin;
return1;
}

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) {
return0;
 }

// not sys.flags.safe_path
constPyConfig*config=_Py_GetConfig();
if (config->safe_path) {
return0;
 }

// root = os.path.dirname(origin.removesuffix(os.sep + "__init__.py"))
wchar_troot[MAXPATHLEN+1];
Py_ssize_tsize=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) {
return0;
 }
// 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) {
return0;
 }
 }
*sep=L'\0';

// sys.path[0] or os.getcwd()
wchar_t*sys_path_0=config->sys_path_0;
if (!sys_path_0) {
return0;
 }

wchar_tsys_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
return0;
 }
sys_path_0=sys_path_0_buf;
 }

intresult=wcscmp(sys_path_0, root) ==0;
returnresult;
}

PyObject*
_Py_module_getattro_impl(PyModuleObject*m, PyObject*name, intsuppress)
{
// When suppress=1, this function suppresses AttributeError.
PyObject*attr, *mod_name, *getattr;
attr=_PyObject_GenericGetAttrWithDict((PyObject*)m, name, NULL, suppress);
if (attr) {
returnattr;
 }
if (suppress==1) {
if (PyErr_Occurred()) {
// pass up non-AttributeError exception
returnNULL;
 }
 }
else {
if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
// pass up non-AttributeError exception
returnNULL;
 }
PyErr_Clear();
 }
assert(m->md_dict!=NULL);
if (PyDict_GetItemRef(m->md_dict, &_Py_ID(__getattr__), &getattr) <0) {
returnNULL;
 }
if (getattr) {
PyObject*result=PyObject_CallOneArg(getattr, name);
if (result==NULL&&suppress==1&&PyErr_ExceptionMatches(PyExc_AttributeError)) {
// suppress AttributeError
PyErr_Clear();
 }
Py_DECREF(getattr);
returnresult;
 }

// 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) {
returnNULL;
 }
if (PyDict_GetItemRef(m->md_dict, &_Py_ID(__name__), &mod_name) <0) {
returnNULL;
 }
if (!mod_name|| !PyUnicode_Check(mod_name)) {
Py_XDECREF(mod_name);
PyErr_Format(PyExc_AttributeError,
"module has no attribute '%U'", name);
returnNULL;
 }
PyObject*spec;
if (PyDict_GetItemRef(m->md_dict, &_Py_ID(__spec__), &spec) <0) {
Py_DECREF(mod_name);
returnNULL;
 }
if (spec==NULL) {
PyErr_Format(PyExc_AttributeError,
"module '%U' has no attribute '%U'",
mod_name, name);
Py_DECREF(mod_name);
returnNULL;
 }

PyObject*origin=NULL;
if (_PyModuleSpec_GetFileOrigin(spec, &origin) <0) {
 goto done;
 }

intis_possibly_shadowing=_PyModule_IsPossiblyShadowing(origin);
if (is_possibly_shadowing<0) {
 goto done;
 }
intis_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)) {