cpython/Objects/classobject.c at v3.6.15 · python/cpython · GitHub

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

#include "Python.h"

#include "structmember.h"

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

/* Free list for method objects to safe malloc/free overhead

* The im_self element is used to chain the elements.

static PyMethodObject *free_list;

static int numfree = 0;

#ifndef PyMethod_MAXFREELIST

#define PyMethod_MAXFREELIST 256

#endif

_Py_IDENTIFIER(__name__);

_Py_IDENTIFIER(__qualname__);

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;

}

/* 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)

{

PyMethodObject *im;

if (self == NULL) {

PyErr_BadInternalCall();

return NULL;

}

im = free_list;

if (im != NULL) {

free_list = (PyMethodObject *)(im->im_self);

(void)PyObject_INIT(im, &PyMethod_Type);

numfree--;

}

else {

im = PyObject_GC_New(PyMethodObject, &PyMethod_Type);

if (im == NULL)

return NULL;

}

im->im_weakreflist = NULL;

Py_INCREF(func);

im->im_func = func;

Py_XINCREF(self);

im->im_self = self;

_PyObject_GC_TRACK(im);

return (PyObject *)im;

}

static PyObject *

method_reduce(PyMethodObject *im)

{

PyObject *self = PyMethod_GET_SELF(im);

PyObject *func = PyMethod_GET_FUNCTION(im);

PyObject *funcname;

_Py_IDENTIFIER(getattr);

funcname = _PyObject_GetAttrId(func, &PyId___name__);

if (funcname == NULL) {

return NULL;

}

return Py_BuildValue("N(ON)", _PyEval_GetBuiltinId(&PyId_getattr),

self, funcname);

}

static PyMethodDef method_methods[] = {

{"__reduce__", (PyCFunction)method_reduce, METH_NOARGS, NULL},

{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__", T_OBJECT, MO_OFF(im_func), READONLY|RESTRICTED,

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

{"__self__", T_OBJECT, MO_OFF(im_self), READONLY|RESTRICTED,

"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)

{

static PyObject *docstr;

if (docstr == NULL) {

docstr= PyUnicode_InternFromString("__doc__");

if (docstr == NULL)

return NULL;

}

return PyObject_GetAttr(im->im_func, docstr);

}

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 = obj->ob_type;

PyObject *descr = NULL;

{

if (tp->tp_dict == NULL) {

if (PyType_Ready(tp) < 0)

return NULL;

}

descr = _PyType_Lookup(tp, name);

}

if (descr != NULL) {

descrgetfunc f = TP_DESCR_GET(descr->ob_type);

if (f != NULL)

return f(descr, obj, (PyObject *)obj->ob_type);

else {

Py_INCREF(descr);

return descr;

}

return PyObject_GetAttr(im->im_func, name);

}

PyDoc_STRVAR(method_doc,

"method(function, instance)\n\

\n\

Create a bound instance method object.");

static PyObject *

method_new(PyTypeObject* type, PyObject* args, PyObject *kw)

{

PyObject *func;

PyObject *self;

if (!_PyArg_NoKeywords("method", kw))

return NULL;

if (!PyArg_UnpackTuple(args, "method", 2, 2,

&func, &self))

return NULL;

if (!PyCallable_Check(func)) {

PyErr_SetString(PyExc_TypeError,

"first argument must be callable");

return NULL;

}

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

PyErr_SetString(PyExc_TypeError,

"self must not be None");

return NULL;

}

return PyMethod_New(func, self);

}

static void

method_dealloc(PyMethodObject *im)

{

_PyObject_GC_UNTRACK(im);

if (im->im_weakreflist != NULL)

PyObject_ClearWeakRefs((PyObject *)im);

Py_DECREF(im->im_func);

Py_XDECREF(im->im_self);

if (numfree < PyMethod_MAXFREELIST) {

im->im_self = (PyObject *)free_list;

free_list = im;

numfree++;

}

else {

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) {

if (a->im_self == NULL || b->im_self == NULL)

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

else

eq = PyObject_RichCompareBool(a->im_self, b->im_self,

Py_EQ);

}

if (eq < 0)

return NULL;

if (op == Py_EQ)

res = eq ? Py_True : Py_False;

else

res = eq ? Py_False : Py_True;

Py_INCREF(res);

return res;

}

static PyObject *

method_repr(PyMethodObject *a)

{

PyObject *self = a->im_self;

PyObject *func = a->im_func;

PyObject *funcname = NULL, *result = NULL;

const char *defname = "?";

funcname = _PyObject_GetAttrId(func, &PyId___qualname__);

if (funcname == NULL) {

if (!PyErr_ExceptionMatches(PyExc_AttributeError))

return NULL;

PyErr_Clear();

funcname = _PyObject_GetAttrId(func, &PyId___name__);

if (funcname == NULL) {

if (!PyErr_ExceptionMatches(PyExc_AttributeError))

return NULL;

PyErr_Clear();

}

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

Py_DECREF(funcname);

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;

if (a->im_self == NULL)

x = PyObject_Hash(Py_None);

else

x = PyObject_Hash(a->im_self);

if (x == -1)

return -1;

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_call(PyObject *method, PyObject *args, PyObject *kwargs)

{

PyObject *self, *func;

self = PyMethod_GET_SELF(method);

if (self == NULL) {

PyErr_BadInternalCall();

return NULL;

}

func = PyMethod_GET_FUNCTION(method);

return _PyObject_Call_Prepend(func, self, args, kwargs);

}

static PyObject *

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

{

/* Don't rebind an already bound method of a class that's not a base

class of cls. */

if (PyMethod_GET_SELF(meth) != NULL) {

/* Already bound */

Py_INCREF(meth);

return meth;

}

/* Bind it to obj */

return PyMethod_New(PyMethod_GET_FUNCTION(meth), obj);

}

PyTypeObject PyMethod_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"method",

sizeof(PyMethodObject),

(destructor)method_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_reserved */

(reprfunc)method_repr, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

(hashfunc)method_hash, /* tp_hash */

method_call, /* tp_call */

0, /* tp_str */

method_getattro, /* tp_getattro */

PyObject_GenericSetAttr, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */

method_doc, /* tp_doc */

(traverseproc)method_traverse, /* tp_traverse */

0, /* tp_clear */

method_richcompare, /* tp_richcompare */

offsetof(PyMethodObject, im_weakreflist), /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

method_methods, /* tp_methods */

method_memberlist, /* tp_members */

method_getset, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

method_descr_get, /* tp_descr_get */

0, /* tp_descr_set */

0, /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

method_new, /* tp_new */

};

/* Clear out the free list */

int

PyMethod_ClearFreeList(void)

{

int freelist_size = numfree;

while (free_list) {

PyMethodObject *im = free_list;

free_list = (PyMethodObject *)(im->im_self);

PyObject_GC_Del(im);

numfree--;

}

assert(numfree == 0);

return freelist_size;

}

void

PyMethod_Fini(void)

{

(void)PyMethod_ClearFreeList();

}

/* Print summary info about the state of the optimized allocator */

void

_PyMethod_DebugMallocStats(FILE *out)

{

_PyDebugAllocatorStats(out,

"free PyMethodObject",

numfree, sizeof(PyMethodObject));

}

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

* instance method

PyObject *

PyInstanceMethod_New(PyObject *func) {

PyInstanceMethodObject *method;

method = PyObject_GC_New(PyInstanceMethodObject,

&PyInstanceMethod_Type);

if (method == NULL) return NULL;

Py_INCREF(func);

method->func = 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__", T_OBJECT, IMO_OFF(func), READONLY|RESTRICTED,

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

{NULL} /* Sentinel */

};

static PyObject *

instancemethod_get_doc(PyObject *self, void *context)

{

static PyObject *docstr;

if (docstr == NULL) {

docstr = PyUnicode_InternFromString("__doc__");

if (docstr == NULL)

return NULL;

}

return PyObject_GetAttr(PyInstanceMethod_GET_FUNCTION(self), docstr);

}

static PyGetSetDef instancemethod_getset[] = {

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

{0}

};

static PyObject *

instancemethod_getattro(PyObject *self, PyObject *name)

{

PyTypeObject *tp = self->ob_type;

PyObject *descr = NULL;

if (tp->tp_dict == NULL) {

if (PyType_Ready(tp) < 0)

return NULL;

}

descr = _PyType_Lookup(tp, name);

if (descr != NULL) {

descrgetfunc f = TP_DESCR_GET(descr->ob_type);

if (f != NULL)

return f(descr, self, (PyObject *)self->ob_type);

else {

Py_INCREF(descr);

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(PyMethod_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) {

Py_INCREF(func);

return 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;

Py_INCREF(res);

return res;

}

static PyObject *

instancemethod_repr(PyObject *self)

{

PyObject *func = PyInstanceMethod_Function(self);

PyObject *funcname = NULL , *result = NULL;

char *defname = "?";

if (func == NULL) {

PyErr_BadInternalCall();

return NULL;

}

funcname = _PyObject_GetAttrId(func, &PyId___name__);

if (funcname == NULL) {

if (!PyErr_ExceptionMatches(PyExc_AttributeError))

return NULL;

PyErr_Clear();

}

else if (!PyUnicode_Check(funcname)) {

Py_DECREF(funcname);

funcname = NULL;

}

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

funcname, defname, self);

Py_XDECREF(funcname);

return result;

}

static long

instancemethod_hash(PyObject *self)

{

long x, y;

x = (long)self;

y = PyObject_Hash(PyInstanceMethod_GET_FUNCTION(self));

if (y == -1)

return -1;

x = x ^ y;

if (x == -1)

x = -2;

return x;

}

PyDoc_STRVAR(instancemethod_doc,

"instancemethod(function)\n\

\n\

Bind a function to a class.");

static PyObject *

instancemethod_new(PyTypeObject* type, PyObject* args, PyObject *kw)

{

PyObject *func;

if (!_PyArg_NoKeywords("instancemethod", kw))

return NULL;

if (!PyArg_UnpackTuple(args, "instancemethod", 1, 1, &func))

return NULL;

if (!PyCallable_Check(func)) {

PyErr_SetString(PyExc_TypeError,

"first argument must be callable");

return NULL;

}

return PyInstanceMethod_New(func);

}

PyTypeObject PyInstanceMethod_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"instancemethod", /* tp_name */

sizeof(PyInstanceMethodObject), /* tp_basicsize */

0, /* tp_itemsize */

instancemethod_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_reserved */

(reprfunc)instancemethod_repr, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /*(hashfunc)instancemethod_hash, tp_hash */

instancemethod_call, /* tp_call */

0, /* tp_str */

instancemethod_getattro, /* tp_getattro */

PyObject_GenericSetAttr, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT

| Py_TPFLAGS_HAVE_GC, /* tp_flags */

instancemethod_doc, /* tp_doc */

instancemethod_traverse, /* tp_traverse */

0, /* tp_clear */

instancemethod_richcompare, /* tp_richcompare */

0, /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

0, /* tp_methods */

instancemethod_memberlist, /* tp_members */

instancemethod_getset, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

instancemethod_descr_get, /* tp_descr_get */

0, /* tp_descr_set */

0, /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

instancemethod_new, /* tp_new */

};

cpython/Objects/classobject.c at v3.6.15 · python/cpython · GitHub

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