cpython/Objects/classobject.c at 3.13 · python/cpython · GitHub

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/* Class object implementation (dead now except for methods) */

#include "Python.h"

#include "pycore_call.h" // _PyObject_VectorcallTstate()

#include "pycore_ceval.h" // _PyEval_GetBuiltin()

#include "pycore_object.h"

#include "pycore_pyerrors.h"

#include "pycore_pystate.h" // _PyThreadState_GET()

#include "pycore_weakref.h" // FT_CLEAR_WEAKREFS()

#include "clinic/classobject.c.h"

#define TP_DESCR_GET(t) ((t)->tp_descr_get)

/*[clinic input]

class method "PyMethodObject *" "&PyMethod_Type"

[clinic start generated code]*/

/*[clinic end generated code: output=da39a3ee5e6b4b0d input=b16e47edf6107c23]*/

PyObject *

PyMethod_Function(PyObject *im)

{

if (!PyMethod_Check(im)) {

PyErr_BadInternalCall();

return NULL;

}

return ((PyMethodObject *)im)->im_func;

}

PyObject *

PyMethod_Self(PyObject *im)

{

if (!PyMethod_Check(im)) {

PyErr_BadInternalCall();

return NULL;

}

return ((PyMethodObject *)im)->im_self;

}

static PyObject *

method_vectorcall(PyObject *method, PyObject *const *args,

size_t nargsf, PyObject *kwnames)

{

assert(Py_IS_TYPE(method, &PyMethod_Type));

PyThreadState *tstate = _PyThreadState_GET();

PyObject *self = PyMethod_GET_SELF(method);

PyObject *func = PyMethod_GET_FUNCTION(method);

Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);

assert(nargs == 0 || args[nargs-1]);

PyObject *result;

if (nargsf & PY_VECTORCALL_ARGUMENTS_OFFSET) {

/* PY_VECTORCALL_ARGUMENTS_OFFSET is set, so we are allowed to mutate the vector */

PyObject **newargs = (PyObject**)args - 1;

nargs += 1;

PyObject *tmp = newargs[0];

newargs[0] = self;

assert(newargs[nargs-1]);

result = _PyObject_VectorcallTstate(tstate, func, newargs,

nargs, kwnames);

newargs[0] = tmp;

}

else {

Py_ssize_t nkwargs = (kwnames == NULL) ? 0 : PyTuple_GET_SIZE(kwnames);

Py_ssize_t totalargs = nargs + nkwargs;

if (totalargs == 0) {

return _PyObject_VectorcallTstate(tstate, func, &self, 1, NULL);

}

PyObject *newargs_stack[_PY_FASTCALL_SMALL_STACK];

PyObject **newargs;

if (totalargs <= (Py_ssize_t)Py_ARRAY_LENGTH(newargs_stack) - 1) {

newargs = newargs_stack;

}

else {

newargs = PyMem_Malloc((totalargs+1) * sizeof(PyObject *));

if (newargs == NULL) {

_PyErr_NoMemory(tstate);

return NULL;

}

/* use borrowed references */

newargs[0] = self;

/* bpo-37138: since totalargs > 0, it's impossible that args is NULL.

* We need this, since calling memcpy() with a NULL pointer is

* undefined behaviour. */

assert(args != NULL);

memcpy(newargs + 1, args, totalargs * sizeof(PyObject *));

result = _PyObject_VectorcallTstate(tstate, func,

newargs, nargs+1, kwnames);

if (newargs != newargs_stack) {

PyMem_Free(newargs);

}

return result;

}

/* Method objects are used for bound instance methods returned by

instancename.methodname. ClassName.methodname returns an ordinary

function.

PyObject *

PyMethod_New(PyObject *func, PyObject *self)

{

if (self == NULL) {

PyErr_BadInternalCall();

return NULL;

}

PyMethodObject *im = PyObject_GC_New(PyMethodObject, &PyMethod_Type);

if (im == NULL) {

return NULL;

}

im->im_weakreflist = NULL;

im->im_func = Py_NewRef(func);

im->im_self = Py_NewRef(self);

im->vectorcall = method_vectorcall;

_PyObject_GC_TRACK(im);

return (PyObject *)im;

}

/*[clinic input]

method.__reduce__

[clinic start generated code]*/

static PyObject *

method___reduce___impl(PyMethodObject *self)

/*[clinic end generated code: output=6c04506d0fa6fdcb input=143a0bf5e96de6e8]*/

{

PyObject *funcself = PyMethod_GET_SELF(self);

PyObject *func = PyMethod_GET_FUNCTION(self);

PyObject *funcname = PyObject_GetAttr(func, &_Py_ID(__name__));

if (funcname == NULL) {

return NULL;

}

return Py_BuildValue(

"N(ON)", _PyEval_GetBuiltin(&_Py_ID(getattr)), funcself, funcname);

}

static PyMethodDef method_methods[] = {

METHOD___REDUCE___METHODDEF

{NULL, NULL}

};

/* Descriptors for PyMethod attributes */

/* im_func and im_self are stored in the PyMethod object */

#define MO_OFF(x) offsetof(PyMethodObject, x)

static PyMemberDef method_memberlist[] = {

{"__func__", _Py_T_OBJECT, MO_OFF(im_func), Py_READONLY,

"the function (or other callable) implementing a method"},

{"__self__", _Py_T_OBJECT, MO_OFF(im_self), Py_READONLY,

"the instance to which a method is bound"},

{NULL} /* Sentinel */

};

/* Christian Tismer argued convincingly that method attributes should

(nearly) always override function attributes.

The one exception is __doc__; there's a default __doc__ which

should only be used for the class, not for instances */

static PyObject *

method_get_doc(PyMethodObject *im, void *context)

{

return PyObject_GetAttr(im->im_func, &_Py_ID(__doc__));

}

static PyGetSetDef method_getset[] = {

{"__doc__", (getter)method_get_doc, NULL, NULL},

{0}

};

static PyObject *

method_getattro(PyObject *obj, PyObject *name)

{

PyMethodObject *im = (PyMethodObject *)obj;

PyTypeObject *tp = Py_TYPE(obj);

PyObject *descr = NULL;

{

if (!_PyType_IsReady(tp)) {

if (PyType_Ready(tp) < 0)

return NULL;

}

descr = _PyType_LookupRef(tp, name);

}

if (descr != NULL) {

descrgetfunc f = TP_DESCR_GET(Py_TYPE(descr));

if (f != NULL) {

PyObject *res = f(descr, obj, (PyObject *)Py_TYPE(obj));

Py_DECREF(descr);

return res;

}

else {

return descr;

}

return PyObject_GetAttr(im->im_func, name);

}

/*[clinic input]

@classmethod

method.__new__ as method_new

function: object

instance: object

Create a bound instance method object.

[clinic start generated code]*/

static PyObject *

method_new_impl(PyTypeObject *type, PyObject *function, PyObject *instance)

/*[clinic end generated code: output=d33ef4ebf702e1f7 input=4e32facc3c3108ae]*/

{

if (!PyCallable_Check(function)) {

PyErr_SetString(PyExc_TypeError,

"first argument must be callable");

return NULL;

}

if (instance == NULL || instance == Py_None) {

PyErr_SetString(PyExc_TypeError,

"instance must not be None");

return NULL;

}

return PyMethod_New(function, instance);

}

static void

method_dealloc(PyMethodObject *im)

{

_PyObject_GC_UNTRACK(im);

FT_CLEAR_WEAKREFS((PyObject*)im, im->im_weakreflist);

Py_DECREF(im->im_func);

Py_XDECREF(im->im_self);

PyObject_GC_Del(im);

}

static PyObject *

method_richcompare(PyObject *self, PyObject *other, int op)

{

PyMethodObject *a, *b;

PyObject *res;

int eq;

if ((op != Py_EQ && op != Py_NE) ||

!PyMethod_Check(self) ||

!PyMethod_Check(other))

{

Py_RETURN_NOTIMPLEMENTED;

}

a = (PyMethodObject *)self;

b = (PyMethodObject *)other;

eq = PyObject_RichCompareBool(a->im_func, b->im_func, Py_EQ);

if (eq == 1) {

eq = (a->im_self == b->im_self);

}

else if (eq < 0)

return NULL;

if (op == Py_EQ)

res = eq ? Py_True : Py_False;

else

res = eq ? Py_False : Py_True;

return Py_NewRef(res);

}

static PyObject *

method_repr(PyMethodObject *a)

{

PyObject *self = a->im_self;

PyObject *func = a->im_func;

PyObject *funcname, *result;

const char *defname = "?";

if (PyObject_GetOptionalAttr(func, &_Py_ID(__qualname__), &funcname) < 0 ||

(funcname == NULL &&

PyObject_GetOptionalAttr(func, &_Py_ID(__name__), &funcname) < 0))

{

return NULL;

}

if (funcname != NULL && !PyUnicode_Check(funcname)) {

Py_SETREF(funcname, NULL);

}

/* XXX Shouldn't use repr()/%R here! */

result = PyUnicode_FromFormat("<bound method %V of %R>",

funcname, defname, self);

Py_XDECREF(funcname);

return result;

}

static Py_hash_t

method_hash(PyMethodObject *a)

{

Py_hash_t x, y;

x = PyObject_GenericHash(a->im_self);

y = PyObject_Hash(a->im_func);

if (y == -1)

return -1;

x = x ^ y;

if (x == -1)

x = -2;

return x;

}

static int

method_traverse(PyMethodObject *im, visitproc visit, void *arg)

{

Py_VISIT(im->im_func);

Py_VISIT(im->im_self);

return 0;

}

static PyObject *

method_descr_get(PyObject *meth, PyObject *obj, PyObject *cls)

{

Py_INCREF(meth);

return meth;

}

PyTypeObject PyMethod_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

.tp_name = "method",

.tp_basicsize = sizeof(PyMethodObject),

.tp_dealloc = (destructor)method_dealloc,

.tp_vectorcall_offset = offsetof(PyMethodObject, vectorcall),

.tp_repr = (reprfunc)method_repr,

.tp_hash = (hashfunc)method_hash,

.tp_call = PyVectorcall_Call,

.tp_getattro = method_getattro,

.tp_setattro = PyObject_GenericSetAttr,

.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |

Py_TPFLAGS_HAVE_VECTORCALL,

.tp_doc = method_new__doc__,

.tp_traverse = (traverseproc)method_traverse,

.tp_richcompare = method_richcompare,

.tp_weaklistoffset = offsetof(PyMethodObject, im_weakreflist),

.tp_methods = method_methods,

.tp_members = method_memberlist,

.tp_getset = method_getset,

.tp_descr_get = method_descr_get,

.tp_new = method_new,

};

/* ------------------------------------------------------------------------

* instance method

/*[clinic input]

class instancemethod "PyInstanceMethodObject *" "&PyInstanceMethod_Type"

[clinic start generated code]*/

/*[clinic end generated code: output=da39a3ee5e6b4b0d input=28c9762a9016f4d2]*/

PyObject *

PyInstanceMethod_New(PyObject *func) {

PyInstanceMethodObject *method;

method = PyObject_GC_New(PyInstanceMethodObject,

&PyInstanceMethod_Type);

if (method == NULL) return NULL;

method->func = Py_NewRef(func);

_PyObject_GC_TRACK(method);

return (PyObject *)method;

}

PyObject *

PyInstanceMethod_Function(PyObject *im)

{

if (!PyInstanceMethod_Check(im)) {

PyErr_BadInternalCall();

return NULL;

}

return PyInstanceMethod_GET_FUNCTION(im);

}

#define IMO_OFF(x) offsetof(PyInstanceMethodObject, x)

static PyMemberDef instancemethod_memberlist[] = {

{"__func__", _Py_T_OBJECT, IMO_OFF(func), Py_READONLY,

"the function (or other callable) implementing a method"},

{NULL} /* Sentinel */

};

static PyObject *

instancemethod_get_doc(PyObject *self, void *context)

{

return PyObject_GetAttr(PyInstanceMethod_GET_FUNCTION(self),

&_Py_ID(__doc__));

}

static PyGetSetDef instancemethod_getset[] = {

{"__doc__", (getter)instancemethod_get_doc, NULL, NULL},

{0}

};

static PyObject *

instancemethod_getattro(PyObject *self, PyObject *name)

{

PyTypeObject *tp = Py_TYPE(self);

PyObject *descr = NULL;

if (!_PyType_IsReady(tp)) {

if (PyType_Ready(tp) < 0)

return NULL;

}

descr = _PyType_LookupRef(tp, name);

if (descr != NULL) {

descrgetfunc f = TP_DESCR_GET(Py_TYPE(descr));

if (f != NULL) {

PyObject *res = f(descr, self, (PyObject *)Py_TYPE(self));

Py_DECREF(descr);

return res;

}

else {

return descr;

}

return PyObject_GetAttr(PyInstanceMethod_GET_FUNCTION(self), name);

}

static void

instancemethod_dealloc(PyObject *self) {

_PyObject_GC_UNTRACK(self);

Py_DECREF(PyInstanceMethod_GET_FUNCTION(self));

PyObject_GC_Del(self);

}

static int

instancemethod_traverse(PyObject *self, visitproc visit, void *arg) {

Py_VISIT(PyInstanceMethod_GET_FUNCTION(self));

return 0;

}

static PyObject *

instancemethod_call(PyObject *self, PyObject *arg, PyObject *kw)

{

return PyObject_Call(PyInstanceMethod_GET_FUNCTION(self), arg, kw);

}

static PyObject *

instancemethod_descr_get(PyObject *descr, PyObject *obj, PyObject *type) {

PyObject *func = PyInstanceMethod_GET_FUNCTION(descr);

if (obj == NULL) {

return Py_NewRef(func);

}

else

return PyMethod_New(func, obj);

}

static PyObject *

instancemethod_richcompare(PyObject *self, PyObject *other, int op)

{

PyInstanceMethodObject *a, *b;

PyObject *res;

int eq;

if ((op != Py_EQ && op != Py_NE) ||

!PyInstanceMethod_Check(self) ||

!PyInstanceMethod_Check(other))

{

Py_RETURN_NOTIMPLEMENTED;

}

a = (PyInstanceMethodObject *)self;

b = (PyInstanceMethodObject *)other;

eq = PyObject_RichCompareBool(a->func, b->func, Py_EQ);

if (eq < 0)

return NULL;

if (op == Py_EQ)

res = eq ? Py_True : Py_False;

else

res = eq ? Py_False : Py_True;

return Py_NewRef(res);

}

static PyObject *

instancemethod_repr(PyObject *self)

{

PyObject *func = PyInstanceMethod_Function(self);

PyObject *funcname, *result;

const char *defname = "?";

if (func == NULL) {

PyErr_BadInternalCall();

return NULL;

}

if (PyObject_GetOptionalAttr(func, &_Py_ID(__name__), &funcname) < 0) {

return NULL;

}

if (funcname != NULL && !PyUnicode_Check(funcname)) {

Py_SETREF(funcname, NULL);

}

result = PyUnicode_FromFormat("<instancemethod %V at %p>",

funcname, defname, self);

Py_XDECREF(funcname);

return result;

}

/*[clinic input]

@classmethod

instancemethod.__new__ as instancemethod_new

function: object

Bind a function to a class.

[clinic start generated code]*/

static PyObject *

instancemethod_new_impl(PyTypeObject *type, PyObject *function)

/*[clinic end generated code: output=5e0397b2bdb750be input=cfc54e8b973664a8]*/

{

if (!PyCallable_Check(function)) {

PyErr_SetString(PyExc_TypeError,

"first argument must be callable");

return NULL;

}

return PyInstanceMethod_New(function);

}

PyTypeObject PyInstanceMethod_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

.tp_name = "instancemethod",

.tp_basicsize = sizeof(PyInstanceMethodObject),

.tp_dealloc = instancemethod_dealloc,

.tp_repr = (reprfunc)instancemethod_repr,

.tp_call = instancemethod_call,

.tp_getattro = instancemethod_getattro,

.tp_setattro = PyObject_GenericSetAttr,

.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,

.tp_doc = instancemethod_new__doc__,

.tp_traverse = instancemethod_traverse,

.tp_richcompare = instancemethod_richcompare,

.tp_members = instancemethod_memberlist,

.tp_getset = instancemethod_getset,

.tp_descr_get = instancemethod_descr_get,

.tp_new = instancemethod_new,

};

cpython/Objects/classobject.c at 3.13 · python/cpython · GitHub

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cpython/Objects/classobject.c at 3.13 · python/cpython · GitHub

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