cpython/Objects/moduleobject.c at tkinter_docs · native-api/cpython · GitHub

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/* Module object implementation */

#include "Python.h"

#include "internal/pystate.h"

#include "structmember.h"

static Py_ssize_t max_module_number;

typedef struct {

PyObject_HEAD

PyObject *md_dict;

struct PyModuleDef *md_def;

void *md_state;

PyObject *md_weaklist;

PyObject *md_name; /* for logging purposes after md_dict is cleared */

} PyModuleObject;

static PyMemberDef module_members[] = {

{"__dict__", T_OBJECT, offsetof(PyModuleObject, md_dict), READONLY},

{0}

};

/* Helper for sanity check for traverse not handling m_state == NULL

* Issue #32374 */

#ifdef Py_DEBUG

static int

bad_traverse_test(PyObject *self, void *arg) {

assert(self != NULL);

return 0;

}

#endif

PyTypeObject PyModuleDef_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"moduledef", /* tp_name */

sizeof(struct PyModuleDef), /* tp_size */

0, /* tp_itemsize */

};

PyObject*

PyModuleDef_Init(struct PyModuleDef* def)

{

if (PyType_Ready(&PyModuleDef_Type) < 0)

return NULL;

if (def->m_base.m_index == 0) {

max_module_number++;

Py_REFCNT(def) = 1;

Py_TYPE(def) = &PyModuleDef_Type;

def->m_base.m_index = max_module_number;

}

return (PyObject*)def;

}

static int

module_init_dict(PyModuleObject *mod, PyObject *md_dict,

PyObject *name, PyObject *doc)

{

_Py_IDENTIFIER(__name__);

_Py_IDENTIFIER(__doc__);

_Py_IDENTIFIER(__package__);

_Py_IDENTIFIER(__loader__);

_Py_IDENTIFIER(__spec__);

if (md_dict == NULL)

return -1;

if (doc == NULL)

doc = Py_None;

if (_PyDict_SetItemId(md_dict, &PyId___name__, name) != 0)

return -1;

if (_PyDict_SetItemId(md_dict, &PyId___doc__, doc) != 0)

return -1;

if (_PyDict_SetItemId(md_dict, &PyId___package__, Py_None) != 0)

return -1;

if (_PyDict_SetItemId(md_dict, &PyId___loader__, Py_None) != 0)

return -1;

if (_PyDict_SetItemId(md_dict, &PyId___spec__, Py_None) != 0)

return -1;

if (PyUnicode_CheckExact(name)) {

Py_INCREF(name);

Py_XSETREF(mod->md_name, name);

}

return 0;

}

PyObject *

PyModule_NewObject(PyObject *name)

{

PyModuleObject *m;

m = PyObject_GC_New(PyModuleObject, &PyModule_Type);

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 (module_init_dict(m, m->md_dict, name, NULL) != 0)

goto fail;

PyObject_GC_Track(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;

}

if (PyObject_SetAttrString(module, fdef->ml_name, func) != 0) {

Py_DECREF(func);

return -1;

}

Py_DECREF(func);

}

return 0;

}

PyObject *

PyModule_Create2(struct PyModuleDef* module, int module_api_version)

{

if (!_PyImport_IsInitialized(PyThreadState_GET()->interp))

Py_FatalError("Python import machinery not initialized");

return _PyModule_CreateInitialized(module, module_api_version);

}

PyObject *

_PyModule_CreateInitialized(struct 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;

}

/* Make sure name is fully qualified.

This is a bit of a hack: when the shared library is loaded,

the module name is "package.module", but the module calls

PyModule_Create*() with just "module" for the name. The shared

library loader squirrels away the true name of the module in

_Py_PackageContext, and PyModule_Create*() will substitute this

(if the name actually matches).

if (_Py_PackageContext != NULL) {

const char *p = strrchr(_Py_PackageContext, '.');

if (p != NULL && strcmp(module->m_name, p+1) == 0) {

name = _Py_PackageContext;

_Py_PackageContext = NULL;

}

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;

return (PyObject*)m;

}

PyObject *

PyModule_FromDefAndSpec2(struct PyModuleDef* def, PyObject *spec, int module_api_version)

{

PyModuleDef_Slot* cur_slot;

PyObject *(*create)(PyObject *, PyModuleDef*) = NULL;

PyObject *nameobj;

PyObject *m = NULL;

int has_execution_slots = 0;

const char *name;

int ret;

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++) {

if (cur_slot->slot == Py_mod_create) {

if (create) {

PyErr_Format(

PyExc_SystemError,

"module %s has multiple create slots",

name);

goto error;

}

create = cur_slot->value;

} else if (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;

} else {

has_execution_slots = 1;

}

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_Format(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;

} 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;

}

/* Sanity check for traverse not handling m_state == NULL

* This doesn't catch all possible cases, but in many cases it should

* make many cases of invalid code crash or raise Valgrind issues

* sooner than they would otherwise.

* Issue #32374 */

#ifdef Py_DEBUG

if (def->m_traverse != NULL) {

def->m_traverse(m, bad_traverse_test, NULL);

}

#endif

Py_DECREF(nameobj);

return m;

error:

Py_DECREF(nameobj);

Py_XDECREF(m);

return NULL;

}

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_Format(

PyExc_SystemError,

"execution of module %s raised unreported exception",

name);

return -1;

}

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;

_Py_IDENTIFIER(__doc__);

v = PyUnicode_FromString(doc);

if (v == NULL || _PyObject_SetAttrId(m, &PyId___doc__, v) != 0) {

Py_XDECREF(v);

return -1;

}

Py_DECREF(v);

return 0;

}

PyObject *

PyModule_GetDict(PyObject *m)

{

PyObject *d;

if (!PyModule_Check(m)) {

PyErr_BadInternalCall();

return NULL;

}

d = ((PyModuleObject *)m) -> md_dict;

assert(d != NULL);

return d;

}

PyObject*

PyModule_GetNameObject(PyObject *m)

{

_Py_IDENTIFIER(__name__);

PyObject *d;

PyObject *name;

if (!PyModule_Check(m)) {

PyErr_BadArgument();

return NULL;

}

d = ((PyModuleObject *)m)->md_dict;

if (d == NULL ||

(name = _PyDict_GetItemId(d, &PyId___name__)) == NULL ||

!PyUnicode_Check(name))

{

PyErr_SetString(PyExc_SystemError, "nameless module");

return NULL;

}

Py_INCREF(name);

return name;

}

const char *

PyModule_GetName(PyObject *m)

{

PyObject *name = PyModule_GetNameObject(m);

if (name == NULL)

return NULL;

Py_DECREF(name); /* module dict has still a reference */

return PyUnicode_AsUTF8(name);

}

PyObject*

PyModule_GetFilenameObject(PyObject *m)

{

_Py_IDENTIFIER(__file__);

PyObject *d;

PyObject *fileobj;

if (!PyModule_Check(m)) {

PyErr_BadArgument();

return NULL;

}

d = ((PyModuleObject *)m)->md_dict;

if (d == NULL ||

(fileobj = _PyDict_GetItemId(d, &PyId___file__)) == NULL ||

!PyUnicode_Check(fileobj))

{

PyErr_SetString(PyExc_SystemError, "module filename missing");

return NULL;

}

Py_INCREF(fileobj);

return fileobj;

}

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 ((PyModuleObject *)m)->md_def;

}

void*

PyModule_GetState(PyObject* m)

{

if (!PyModule_Check(m)) {

PyErr_BadArgument();

return NULL;

}

return ((PyModuleObject *)m)->md_state;

}

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;

/* 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 (Py_VerboseFlag > 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_WriteUnraisable(NULL);

}

/* 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 (Py_VerboseFlag > 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_WriteUnraisable(NULL);

}

/* 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]*/

{

PyObject *dict = self->md_dict;

if (dict == NULL) {

dict = PyDict_New();

if (dict == NULL)

return -1;

self->md_dict = dict;

}

if (module_init_dict(self, dict, name, doc) < 0)

return -1;

return 0;

}

static void

module_dealloc(PyModuleObject *m)

{

PyObject_GC_UnTrack(m);

if (Py_VerboseFlag && m->md_name) {

PySys_FormatStderr("# destroy %S\n", m->md_name);

}

if (m->md_weaklist != NULL)

PyObject_ClearWeakRefs((PyObject *) m);

if (m->md_def && m->md_def->m_free)

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)

{

PyThreadState *tstate = PyThreadState_GET();

PyInterpreterState *interp = tstate->interp;

return PyObject_CallMethod(interp->importlib, "_module_repr", "O", m);

}

static PyObject*

module_getattro(PyModuleObject *m, PyObject *name)

{

PyObject *attr, *mod_name, *getattr;

attr = PyObject_GenericGetAttr((PyObject *)m, name);

if (attr || !PyErr_ExceptionMatches(PyExc_AttributeError)) {

return attr;

}

PyErr_Clear();

if (m->md_dict) {

_Py_IDENTIFIER(__getattr__);

getattr = _PyDict_GetItemId(m->md_dict, &PyId___getattr__);

if (getattr) {

PyObject* stack[1] = {name};

return _PyObject_FastCall(getattr, stack, 1);

}

_Py_IDENTIFIER(__name__);

mod_name = _PyDict_GetItemId(m->md_dict, &PyId___name__);

if (mod_name && PyUnicode_Check(mod_name)) {

PyErr_Format(PyExc_AttributeError,

"module '%U' has no attribute '%U'", mod_name, name);

return NULL;

}

PyErr_Format(PyExc_AttributeError,

"module has no attribute '%U'", name);

return NULL;

}

static int

module_traverse(PyModuleObject *m, visitproc visit, void *arg)

{

if (m->md_def && m->md_def->m_traverse) {

int res = m->md_def->m_traverse((PyObject*)m, visit, arg);

if (res)

return res;

}

Py_VISIT(m->md_dict);

return 0;

}

static int

module_clear(PyModuleObject *m)

{

if (m->md_def && m->md_def->m_clear) {

int res = m->md_def->m_clear((PyObject*)m);

if (res)

return res;

}

Py_CLEAR(m->md_dict);

return 0;

}

static PyObject *

module_dir(PyObject *self, PyObject *args)

{

_Py_IDENTIFIER(__dict__);

PyObject *result = NULL;

PyObject *dict = _PyObject_GetAttrId(self, &PyId___dict__);

if (dict != NULL) {

if (PyDict_Check(dict)) {

PyObject *dirfunc = PyDict_GetItemString(dict, "__dir__");

if (dirfunc) {

result = _PyObject_CallNoArg(dirfunc);

}

else {

result = PyDict_Keys(dict);

}

else {

const char *name = PyModule_GetName(self);

if (name)

PyErr_Format(PyExc_TypeError,

"%.200s.__dict__ is not a dictionary",

name);

}

Py_XDECREF(dict);

return result;

}

static PyMethodDef module_methods[] = {

{"__dir__", module_dir, METH_NOARGS,

PyDoc_STR("__dir__() -> list\nspecialized dir() implementation")},

{0}

};

PyTypeObject PyModule_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"module", /* tp_name */

sizeof(PyModuleObject), /* tp_size */

0, /* tp_itemsize */

(destructor)module_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_reserved */

(reprfunc)module_repr, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* tp_hash */

0, /* tp_call */

0, /* tp_str */

(getattrofunc)module_getattro, /* tp_getattro */

PyObject_GenericSetAttr, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |

Py_TPFLAGS_BASETYPE, /* tp_flags */

module___init____doc__, /* tp_doc */

(traverseproc)module_traverse, /* tp_traverse */

(inquiry)module_clear, /* tp_clear */

0, /* tp_richcompare */

offsetof(PyModuleObject, md_weaklist), /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

module_methods, /* tp_methods */

module_members, /* tp_members */

0, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

offsetof(PyModuleObject, md_dict), /* tp_dictoffset */

module___init__, /* tp_init */

PyType_GenericAlloc, /* tp_alloc */

PyType_GenericNew, /* tp_new */

PyObject_GC_Del, /* tp_free */

};

cpython/Objects/moduleobject.c at tkinter_docs · native-api/cpython · GitHub

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