mirror of https://github.com/python/cpython
635 lines
18 KiB
C
635 lines
18 KiB
C
/* Class object implementation (dead now except for methods) */
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#include "Python.h"
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#include "pycore_pymem.h"
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#include "pycore_pystate.h"
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#include "structmember.h"
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#define TP_DESCR_GET(t) ((t)->tp_descr_get)
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/* Free list for method objects to safe malloc/free overhead
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* The im_self element is used to chain the elements.
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*/
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static PyMethodObject *free_list;
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static int numfree = 0;
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#ifndef PyMethod_MAXFREELIST
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#define PyMethod_MAXFREELIST 256
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#endif
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_Py_IDENTIFIER(__name__);
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_Py_IDENTIFIER(__qualname__);
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PyObject *
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PyMethod_Function(PyObject *im)
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{
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if (!PyMethod_Check(im)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyMethodObject *)im)->im_func;
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}
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PyObject *
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PyMethod_Self(PyObject *im)
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{
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if (!PyMethod_Check(im)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyMethodObject *)im)->im_self;
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}
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/* Method objects are used for bound instance methods returned by
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instancename.methodname. ClassName.methodname returns an ordinary
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function.
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*/
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PyObject *
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PyMethod_New(PyObject *func, PyObject *self)
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{
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PyMethodObject *im;
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if (self == NULL) {
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PyErr_BadInternalCall();
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return NULL;
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}
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im = free_list;
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if (im != NULL) {
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free_list = (PyMethodObject *)(im->im_self);
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(void)PyObject_INIT((PyObject *)im, &PyMethod_Type);
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numfree--;
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}
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else {
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im = PyObject_GC_New(PyMethodObject, &PyMethod_Type);
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if (im == NULL)
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return NULL;
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}
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im->im_weakreflist = NULL;
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Py_INCREF(func);
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im->im_func = func;
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Py_XINCREF(self);
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im->im_self = self;
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_PyObject_GC_TRACK(im);
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return (PyObject *)im;
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}
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static PyObject *
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method_reduce(PyMethodObject *im, PyObject *Py_UNUSED(ignored))
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{
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PyObject *self = PyMethod_GET_SELF(im);
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PyObject *func = PyMethod_GET_FUNCTION(im);
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PyObject *builtins;
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PyObject *getattr;
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PyObject *funcname;
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_Py_IDENTIFIER(getattr);
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funcname = _PyObject_GetAttrId(func, &PyId___name__);
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if (funcname == NULL) {
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return NULL;
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}
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builtins = PyEval_GetBuiltins();
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getattr = _PyDict_GetItemId(builtins, &PyId_getattr);
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return Py_BuildValue("O(ON)", getattr, self, funcname);
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}
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static PyMethodDef method_methods[] = {
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{"__reduce__", (PyCFunction)method_reduce, METH_NOARGS, NULL},
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{NULL, NULL}
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};
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/* Descriptors for PyMethod attributes */
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/* im_func and im_self are stored in the PyMethod object */
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#define MO_OFF(x) offsetof(PyMethodObject, x)
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static PyMemberDef method_memberlist[] = {
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{"__func__", T_OBJECT, MO_OFF(im_func), READONLY|RESTRICTED,
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"the function (or other callable) implementing a method"},
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{"__self__", T_OBJECT, MO_OFF(im_self), READONLY|RESTRICTED,
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"the instance to which a method is bound"},
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{NULL} /* Sentinel */
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};
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/* Christian Tismer argued convincingly that method attributes should
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(nearly) always override function attributes.
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The one exception is __doc__; there's a default __doc__ which
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should only be used for the class, not for instances */
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static PyObject *
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method_get_doc(PyMethodObject *im, void *context)
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{
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static PyObject *docstr;
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if (docstr == NULL) {
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docstr= PyUnicode_InternFromString("__doc__");
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if (docstr == NULL)
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return NULL;
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}
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return PyObject_GetAttr(im->im_func, docstr);
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}
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static PyGetSetDef method_getset[] = {
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{"__doc__", (getter)method_get_doc, NULL, NULL},
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{0}
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};
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static PyObject *
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method_getattro(PyObject *obj, PyObject *name)
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{
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PyMethodObject *im = (PyMethodObject *)obj;
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PyTypeObject *tp = obj->ob_type;
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PyObject *descr = NULL;
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{
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if (tp->tp_dict == NULL) {
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if (PyType_Ready(tp) < 0)
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return NULL;
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}
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descr = _PyType_Lookup(tp, name);
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}
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if (descr != NULL) {
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descrgetfunc f = TP_DESCR_GET(descr->ob_type);
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if (f != NULL)
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return f(descr, obj, (PyObject *)obj->ob_type);
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else {
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Py_INCREF(descr);
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return descr;
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}
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}
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return PyObject_GetAttr(im->im_func, name);
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}
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PyDoc_STRVAR(method_doc,
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"method(function, instance)\n\
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\n\
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Create a bound instance method object.");
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static PyObject *
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method_new(PyTypeObject* type, PyObject* args, PyObject *kw)
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{
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PyObject *func;
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PyObject *self;
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if (!_PyArg_NoKeywords("method", kw))
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return NULL;
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if (!PyArg_UnpackTuple(args, "method", 2, 2,
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&func, &self))
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return NULL;
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if (!PyCallable_Check(func)) {
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PyErr_SetString(PyExc_TypeError,
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"first argument must be callable");
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return NULL;
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}
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if (self == NULL || self == Py_None) {
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PyErr_SetString(PyExc_TypeError,
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"self must not be None");
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return NULL;
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}
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return PyMethod_New(func, self);
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}
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static void
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method_dealloc(PyMethodObject *im)
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{
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_PyObject_GC_UNTRACK(im);
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if (im->im_weakreflist != NULL)
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PyObject_ClearWeakRefs((PyObject *)im);
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Py_DECREF(im->im_func);
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Py_XDECREF(im->im_self);
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if (numfree < PyMethod_MAXFREELIST) {
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im->im_self = (PyObject *)free_list;
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free_list = im;
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numfree++;
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}
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else {
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PyObject_GC_Del(im);
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}
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}
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static PyObject *
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method_richcompare(PyObject *self, PyObject *other, int op)
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{
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PyMethodObject *a, *b;
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PyObject *res;
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int eq;
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if ((op != Py_EQ && op != Py_NE) ||
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!PyMethod_Check(self) ||
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!PyMethod_Check(other))
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{
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Py_RETURN_NOTIMPLEMENTED;
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}
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a = (PyMethodObject *)self;
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b = (PyMethodObject *)other;
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eq = PyObject_RichCompareBool(a->im_func, b->im_func, Py_EQ);
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if (eq == 1) {
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eq = (a->im_self == b->im_self);
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}
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else if (eq < 0)
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return NULL;
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if (op == Py_EQ)
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res = eq ? Py_True : Py_False;
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else
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res = eq ? Py_False : Py_True;
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Py_INCREF(res);
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return res;
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}
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static PyObject *
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method_repr(PyMethodObject *a)
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{
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PyObject *self = a->im_self;
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PyObject *func = a->im_func;
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PyObject *funcname, *result;
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const char *defname = "?";
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if (_PyObject_LookupAttrId(func, &PyId___qualname__, &funcname) < 0 ||
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(funcname == NULL &&
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_PyObject_LookupAttrId(func, &PyId___name__, &funcname) < 0))
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{
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return NULL;
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}
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if (funcname != NULL && !PyUnicode_Check(funcname)) {
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Py_DECREF(funcname);
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funcname = NULL;
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}
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/* XXX Shouldn't use repr()/%R here! */
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result = PyUnicode_FromFormat("<bound method %V of %R>",
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funcname, defname, self);
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Py_XDECREF(funcname);
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return result;
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}
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static Py_hash_t
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method_hash(PyMethodObject *a)
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{
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Py_hash_t x, y;
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if (a->im_self == NULL)
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x = _Py_HashPointer(Py_None);
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else
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x = _Py_HashPointer(a->im_self);
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y = PyObject_Hash(a->im_func);
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if (y == -1)
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return -1;
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x = x ^ y;
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if (x == -1)
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x = -2;
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return x;
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}
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static int
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method_traverse(PyMethodObject *im, visitproc visit, void *arg)
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{
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Py_VISIT(im->im_func);
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Py_VISIT(im->im_self);
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return 0;
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}
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static PyObject *
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method_call(PyObject *method, PyObject *args, PyObject *kwargs)
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{
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PyObject *self, *func;
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self = PyMethod_GET_SELF(method);
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if (self == NULL) {
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PyErr_BadInternalCall();
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return NULL;
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}
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func = PyMethod_GET_FUNCTION(method);
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return _PyObject_Call_Prepend(func, self, args, kwargs);
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}
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static PyObject *
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method_descr_get(PyObject *meth, PyObject *obj, PyObject *cls)
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{
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/* Don't rebind an already bound method of a class that's not a base
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class of cls. */
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if (PyMethod_GET_SELF(meth) != NULL) {
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/* Already bound */
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Py_INCREF(meth);
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return meth;
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}
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/* Bind it to obj */
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return PyMethod_New(PyMethod_GET_FUNCTION(meth), obj);
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}
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PyTypeObject PyMethod_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"method",
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sizeof(PyMethodObject),
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0,
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(destructor)method_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_reserved */
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(reprfunc)method_repr, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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(hashfunc)method_hash, /* tp_hash */
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method_call, /* tp_call */
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0, /* tp_str */
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method_getattro, /* tp_getattro */
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PyObject_GenericSetAttr, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
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method_doc, /* tp_doc */
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(traverseproc)method_traverse, /* tp_traverse */
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0, /* tp_clear */
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method_richcompare, /* tp_richcompare */
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offsetof(PyMethodObject, im_weakreflist), /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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method_methods, /* tp_methods */
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method_memberlist, /* tp_members */
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method_getset, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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method_descr_get, /* tp_descr_get */
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0, /* tp_descr_set */
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0, /* tp_dictoffset */
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0, /* tp_init */
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0, /* tp_alloc */
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method_new, /* tp_new */
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};
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/* Clear out the free list */
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int
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PyMethod_ClearFreeList(void)
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{
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int freelist_size = numfree;
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while (free_list) {
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PyMethodObject *im = free_list;
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free_list = (PyMethodObject *)(im->im_self);
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PyObject_GC_Del(im);
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numfree--;
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}
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assert(numfree == 0);
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return freelist_size;
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}
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void
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PyMethod_Fini(void)
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{
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(void)PyMethod_ClearFreeList();
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}
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/* Print summary info about the state of the optimized allocator */
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void
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_PyMethod_DebugMallocStats(FILE *out)
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{
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_PyDebugAllocatorStats(out,
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"free PyMethodObject",
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numfree, sizeof(PyMethodObject));
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}
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/* ------------------------------------------------------------------------
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* instance method
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*/
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PyObject *
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PyInstanceMethod_New(PyObject *func) {
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PyInstanceMethodObject *method;
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method = PyObject_GC_New(PyInstanceMethodObject,
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&PyInstanceMethod_Type);
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if (method == NULL) return NULL;
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Py_INCREF(func);
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method->func = func;
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_PyObject_GC_TRACK(method);
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return (PyObject *)method;
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}
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PyObject *
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PyInstanceMethod_Function(PyObject *im)
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{
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if (!PyInstanceMethod_Check(im)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return PyInstanceMethod_GET_FUNCTION(im);
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}
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#define IMO_OFF(x) offsetof(PyInstanceMethodObject, x)
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static PyMemberDef instancemethod_memberlist[] = {
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{"__func__", T_OBJECT, IMO_OFF(func), READONLY|RESTRICTED,
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"the function (or other callable) implementing a method"},
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{NULL} /* Sentinel */
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};
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static PyObject *
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instancemethod_get_doc(PyObject *self, void *context)
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{
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static PyObject *docstr;
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if (docstr == NULL) {
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docstr = PyUnicode_InternFromString("__doc__");
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if (docstr == NULL)
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return NULL;
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}
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return PyObject_GetAttr(PyInstanceMethod_GET_FUNCTION(self), docstr);
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}
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static PyGetSetDef instancemethod_getset[] = {
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{"__doc__", (getter)instancemethod_get_doc, NULL, NULL},
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{0}
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};
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static PyObject *
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instancemethod_getattro(PyObject *self, PyObject *name)
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{
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PyTypeObject *tp = self->ob_type;
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PyObject *descr = NULL;
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if (tp->tp_dict == NULL) {
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if (PyType_Ready(tp) < 0)
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return NULL;
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}
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descr = _PyType_Lookup(tp, name);
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if (descr != NULL) {
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descrgetfunc f = TP_DESCR_GET(descr->ob_type);
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if (f != NULL)
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return f(descr, self, (PyObject *)self->ob_type);
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else {
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Py_INCREF(descr);
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return descr;
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}
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}
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return PyObject_GetAttr(PyInstanceMethod_GET_FUNCTION(self), name);
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}
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static void
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instancemethod_dealloc(PyObject *self) {
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_PyObject_GC_UNTRACK(self);
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Py_DECREF(PyInstanceMethod_GET_FUNCTION(self));
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PyObject_GC_Del(self);
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}
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static int
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instancemethod_traverse(PyObject *self, visitproc visit, void *arg) {
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Py_VISIT(PyInstanceMethod_GET_FUNCTION(self));
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return 0;
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}
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static PyObject *
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instancemethod_call(PyObject *self, PyObject *arg, PyObject *kw)
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{
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return PyObject_Call(PyMethod_GET_FUNCTION(self), arg, kw);
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}
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static PyObject *
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instancemethod_descr_get(PyObject *descr, PyObject *obj, PyObject *type) {
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PyObject *func = PyInstanceMethod_GET_FUNCTION(descr);
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if (obj == NULL) {
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Py_INCREF(func);
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return func;
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}
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else
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return PyMethod_New(func, obj);
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}
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static PyObject *
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instancemethod_richcompare(PyObject *self, PyObject *other, int op)
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{
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PyInstanceMethodObject *a, *b;
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PyObject *res;
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int eq;
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if ((op != Py_EQ && op != Py_NE) ||
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!PyInstanceMethod_Check(self) ||
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!PyInstanceMethod_Check(other))
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{
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Py_RETURN_NOTIMPLEMENTED;
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}
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a = (PyInstanceMethodObject *)self;
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b = (PyInstanceMethodObject *)other;
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eq = PyObject_RichCompareBool(a->func, b->func, Py_EQ);
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if (eq < 0)
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return NULL;
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if (op == Py_EQ)
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res = eq ? Py_True : Py_False;
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else
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res = eq ? Py_False : Py_True;
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Py_INCREF(res);
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return res;
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}
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static PyObject *
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instancemethod_repr(PyObject *self)
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{
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PyObject *func = PyInstanceMethod_Function(self);
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PyObject *funcname, *result;
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const char *defname = "?";
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if (func == NULL) {
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PyErr_BadInternalCall();
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return NULL;
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}
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if (_PyObject_LookupAttrId(func, &PyId___name__, &funcname) < 0) {
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return NULL;
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}
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if (funcname != NULL && !PyUnicode_Check(funcname)) {
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Py_DECREF(funcname);
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funcname = NULL;
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}
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result = PyUnicode_FromFormat("<instancemethod %V at %p>",
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funcname, defname, self);
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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 */
|
|
};
|