mirror of
https://github.com/python/cpython.git
synced 2024-12-15 12:54:31 +08:00
baf0f8f24d
by the function object or by the method object, the function object's attribute usually wins. Christian Tismer pointed out that that this is really a mistake, because this only happens for special methods (like __reduce__) where the method object's version is really more appropriate than the function's attribute. So from now on, all method attributes will have precedence over function attributes with the same name.
2517 lines
60 KiB
C
2517 lines
60 KiB
C
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/* Class object implementation */
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#include "Python.h"
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#include "structmember.h"
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#define TP_DESCR_GET(t) \
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(PyType_HasFeature(t, Py_TPFLAGS_HAVE_CLASS) ? (t)->tp_descr_get : NULL)
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/* Forward */
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static PyObject *class_lookup(PyClassObject *, PyObject *,
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PyClassObject **);
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static PyObject *instance_getattr1(PyInstanceObject *, PyObject *);
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static PyObject *instance_getattr2(PyInstanceObject *, PyObject *);
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static PyObject *getattrstr, *setattrstr, *delattrstr;
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PyObject *
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PyClass_New(PyObject *bases, PyObject *dict, PyObject *name)
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/* bases is NULL or tuple of classobjects! */
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{
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PyClassObject *op, *dummy;
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static PyObject *docstr, *modstr, *namestr;
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if (docstr == NULL) {
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docstr= PyString_InternFromString("__doc__");
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if (docstr == NULL)
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return NULL;
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}
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if (modstr == NULL) {
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modstr= PyString_InternFromString("__module__");
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if (modstr == NULL)
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return NULL;
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}
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if (namestr == NULL) {
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namestr= PyString_InternFromString("__name__");
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if (namestr == NULL)
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return NULL;
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}
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if (name == NULL || !PyString_Check(name)) {
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PyErr_SetString(PyExc_TypeError,
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"PyClass_New: name must be a string");
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return NULL;
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}
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if (dict == NULL || !PyDict_Check(dict)) {
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PyErr_SetString(PyExc_TypeError,
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"PyClass_New: dict must be a dictionary");
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return NULL;
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}
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if (PyDict_GetItem(dict, docstr) == NULL) {
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if (PyDict_SetItem(dict, docstr, Py_None) < 0)
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return NULL;
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}
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if (PyDict_GetItem(dict, modstr) == NULL) {
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PyObject *globals = PyEval_GetGlobals();
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if (globals != NULL) {
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PyObject *modname = PyDict_GetItem(globals, namestr);
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if (modname != NULL) {
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if (PyDict_SetItem(dict, modstr, modname) < 0)
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return NULL;
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}
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}
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}
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if (bases == NULL) {
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bases = PyTuple_New(0);
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if (bases == NULL)
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return NULL;
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}
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else {
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int i, n;
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PyObject *base;
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if (!PyTuple_Check(bases)) {
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PyErr_SetString(PyExc_TypeError,
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"PyClass_New: bases must be a tuple");
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return NULL;
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}
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n = PyTuple_Size(bases);
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for (i = 0; i < n; i++) {
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base = PyTuple_GET_ITEM(bases, i);
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if (!PyClass_Check(base)) {
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if (PyCallable_Check(
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(PyObject *) base->ob_type))
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return PyObject_CallFunction(
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(PyObject *) base->ob_type,
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"OOO",
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name,
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bases,
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dict);
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PyErr_SetString(PyExc_TypeError,
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"PyClass_New: base must be a class");
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return NULL;
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}
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}
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Py_INCREF(bases);
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}
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op = PyObject_GC_New(PyClassObject, &PyClass_Type);
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if (op == NULL) {
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Py_DECREF(bases);
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return NULL;
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}
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op->cl_bases = bases;
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Py_INCREF(dict);
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op->cl_dict = dict;
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Py_XINCREF(name);
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op->cl_name = name;
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if (getattrstr == NULL) {
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getattrstr = PyString_InternFromString("__getattr__");
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setattrstr = PyString_InternFromString("__setattr__");
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delattrstr = PyString_InternFromString("__delattr__");
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}
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op->cl_getattr = class_lookup(op, getattrstr, &dummy);
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op->cl_setattr = class_lookup(op, setattrstr, &dummy);
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op->cl_delattr = class_lookup(op, delattrstr, &dummy);
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Py_XINCREF(op->cl_getattr);
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Py_XINCREF(op->cl_setattr);
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Py_XINCREF(op->cl_delattr);
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_PyObject_GC_TRACK(op);
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return (PyObject *) op;
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}
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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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PyObject *
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PyMethod_Class(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_class;
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}
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PyDoc_STRVAR(class_doc,
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"classobj(name, bases, dict)\n\
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\n\
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Create a class object. The name must be a string; the second argument\n\
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a tuple of classes, and the third a dictionary.");
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static PyObject *
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class_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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{
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PyObject *name, *bases, *dict;
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static char *kwlist[] = {"name", "bases", "dict", 0};
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "SOO", kwlist,
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&name, &bases, &dict))
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return NULL;
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return PyClass_New(bases, dict, name);
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}
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/* Class methods */
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static void
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class_dealloc(PyClassObject *op)
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{
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_PyObject_GC_UNTRACK(op);
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Py_DECREF(op->cl_bases);
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Py_DECREF(op->cl_dict);
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Py_XDECREF(op->cl_name);
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Py_XDECREF(op->cl_getattr);
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Py_XDECREF(op->cl_setattr);
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Py_XDECREF(op->cl_delattr);
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PyObject_GC_Del(op);
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}
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static PyObject *
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class_lookup(PyClassObject *cp, PyObject *name, PyClassObject **pclass)
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{
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int i, n;
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PyObject *value = PyDict_GetItem(cp->cl_dict, name);
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if (value != NULL) {
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*pclass = cp;
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return value;
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}
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n = PyTuple_Size(cp->cl_bases);
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for (i = 0; i < n; i++) {
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/* XXX What if one of the bases is not a class? */
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PyObject *v = class_lookup(
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(PyClassObject *)
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PyTuple_GetItem(cp->cl_bases, i), name, pclass);
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if (v != NULL)
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return v;
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}
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return NULL;
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}
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static PyObject *
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class_getattr(register PyClassObject *op, PyObject *name)
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{
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register PyObject *v;
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register char *sname = PyString_AsString(name);
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PyClassObject *class;
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descrgetfunc f;
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if (sname[0] == '_' && sname[1] == '_') {
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if (strcmp(sname, "__dict__") == 0) {
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if (PyEval_GetRestricted()) {
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PyErr_SetString(PyExc_RuntimeError,
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"class.__dict__ not accessible in restricted mode");
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return NULL;
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}
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Py_INCREF(op->cl_dict);
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return op->cl_dict;
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}
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if (strcmp(sname, "__bases__") == 0) {
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Py_INCREF(op->cl_bases);
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return op->cl_bases;
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}
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if (strcmp(sname, "__name__") == 0) {
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if (op->cl_name == NULL)
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v = Py_None;
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else
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v = op->cl_name;
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Py_INCREF(v);
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return v;
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}
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}
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v = class_lookup(op, name, &class);
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if (v == NULL) {
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PyErr_Format(PyExc_AttributeError,
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"class %.50s has no attribute '%.400s'",
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PyString_AS_STRING(op->cl_name), sname);
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return NULL;
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}
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f = TP_DESCR_GET(v->ob_type);
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if (f == NULL)
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Py_INCREF(v);
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else
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v = f(v, (PyObject *)NULL, (PyObject *)op);
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return v;
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}
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static void
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set_slot(PyObject **slot, PyObject *v)
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{
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PyObject *temp = *slot;
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Py_XINCREF(v);
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*slot = v;
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Py_XDECREF(temp);
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}
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static void
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set_attr_slots(PyClassObject *c)
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{
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PyClassObject *dummy;
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set_slot(&c->cl_getattr, class_lookup(c, getattrstr, &dummy));
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set_slot(&c->cl_setattr, class_lookup(c, setattrstr, &dummy));
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set_slot(&c->cl_delattr, class_lookup(c, delattrstr, &dummy));
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}
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static char *
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set_dict(PyClassObject *c, PyObject *v)
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{
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if (v == NULL || !PyDict_Check(v))
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return "__dict__ must be a dictionary object";
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set_slot(&c->cl_dict, v);
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set_attr_slots(c);
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return "";
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}
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static char *
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set_bases(PyClassObject *c, PyObject *v)
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{
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int i, n;
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if (v == NULL || !PyTuple_Check(v))
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return "__bases__ must be a tuple object";
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n = PyTuple_Size(v);
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for (i = 0; i < n; i++) {
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PyObject *x = PyTuple_GET_ITEM(v, i);
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if (!PyClass_Check(x))
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return "__bases__ items must be classes";
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if (PyClass_IsSubclass(x, (PyObject *)c))
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return "a __bases__ item causes an inheritance cycle";
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}
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set_slot(&c->cl_bases, v);
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set_attr_slots(c);
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return "";
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}
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static char *
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set_name(PyClassObject *c, PyObject *v)
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{
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if (v == NULL || !PyString_Check(v))
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return "__name__ must be a string object";
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if (strlen(PyString_AS_STRING(v)) != (size_t)PyString_GET_SIZE(v))
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return "__name__ must not contain null bytes";
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set_slot(&c->cl_name, v);
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return "";
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}
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static int
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class_setattr(PyClassObject *op, PyObject *name, PyObject *v)
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{
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char *sname;
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if (PyEval_GetRestricted()) {
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PyErr_SetString(PyExc_RuntimeError,
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"classes are read-only in restricted mode");
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return -1;
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}
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sname = PyString_AsString(name);
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if (sname[0] == '_' && sname[1] == '_') {
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int n = PyString_Size(name);
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if (sname[n-1] == '_' && sname[n-2] == '_') {
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char *err = NULL;
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if (strcmp(sname, "__dict__") == 0)
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err = set_dict(op, v);
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else if (strcmp(sname, "__bases__") == 0)
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err = set_bases(op, v);
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else if (strcmp(sname, "__name__") == 0)
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err = set_name(op, v);
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else if (strcmp(sname, "__getattr__") == 0)
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set_slot(&op->cl_getattr, v);
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else if (strcmp(sname, "__setattr__") == 0)
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set_slot(&op->cl_setattr, v);
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else if (strcmp(sname, "__delattr__") == 0)
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set_slot(&op->cl_delattr, v);
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/* For the last three, we fall through to update the
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dictionary as well. */
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if (err != NULL) {
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if (*err == '\0')
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return 0;
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PyErr_SetString(PyExc_TypeError, err);
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return -1;
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}
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}
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}
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if (v == NULL) {
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int rv = PyDict_DelItem(op->cl_dict, name);
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if (rv < 0)
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PyErr_Format(PyExc_AttributeError,
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"class %.50s has no attribute '%.400s'",
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PyString_AS_STRING(op->cl_name), sname);
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return rv;
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}
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else
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return PyDict_SetItem(op->cl_dict, name, v);
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}
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static PyObject *
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class_repr(PyClassObject *op)
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{
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PyObject *mod = PyDict_GetItemString(op->cl_dict, "__module__");
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char *name;
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if (op->cl_name == NULL || !PyString_Check(op->cl_name))
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name = "?";
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else
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name = PyString_AsString(op->cl_name);
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if (mod == NULL || !PyString_Check(mod))
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return PyString_FromFormat("<class ?.%s at %p>", name, op);
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else
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return PyString_FromFormat("<class %s.%s at %p>",
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PyString_AsString(mod),
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name, op);
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}
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static PyObject *
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class_str(PyClassObject *op)
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{
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PyObject *mod = PyDict_GetItemString(op->cl_dict, "__module__");
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PyObject *name = op->cl_name;
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PyObject *res;
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int m, n;
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if (name == NULL || !PyString_Check(name))
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return class_repr(op);
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if (mod == NULL || !PyString_Check(mod)) {
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Py_INCREF(name);
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return name;
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}
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m = PyString_Size(mod);
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n = PyString_Size(name);
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res = PyString_FromStringAndSize((char *)NULL, m+1+n);
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if (res != NULL) {
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char *s = PyString_AsString(res);
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memcpy(s, PyString_AsString(mod), m);
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s += m;
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*s++ = '.';
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memcpy(s, PyString_AsString(name), n);
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}
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return res;
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}
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|
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static int
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class_traverse(PyClassObject *o, visitproc visit, void *arg)
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{
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int err;
|
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if (o->cl_bases) {
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err = visit(o->cl_bases, arg);
|
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if (err)
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return err;
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}
|
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if (o->cl_dict) {
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err = visit(o->cl_dict, arg);
|
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if (err)
|
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return err;
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}
|
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if (o->cl_name) {
|
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err = visit(o->cl_name, arg);
|
|
if (err)
|
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return err;
|
|
}
|
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if (o->cl_getattr) {
|
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err = visit(o->cl_getattr, arg);
|
|
if (err)
|
|
return err;
|
|
}
|
|
if (o->cl_setattr) {
|
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err = visit(o->cl_setattr, arg);
|
|
if (err)
|
|
return err;
|
|
}
|
|
if (o->cl_delattr) {
|
|
err = visit(o->cl_delattr, arg);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
PyTypeObject PyClass_Type = {
|
|
PyObject_HEAD_INIT(&PyType_Type)
|
|
0,
|
|
"classobj",
|
|
sizeof(PyClassObject),
|
|
0,
|
|
(destructor)class_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_compare */
|
|
(reprfunc)class_repr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
0, /* tp_hash */
|
|
PyInstance_New, /* tp_call */
|
|
(reprfunc)class_str, /* tp_str */
|
|
(getattrofunc)class_getattr, /* tp_getattro */
|
|
(setattrofunc)class_setattr, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
|
|
class_doc, /* tp_doc */
|
|
(traverseproc)class_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
0, /* tp_members */
|
|
0, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
0, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
0, /* tp_dictoffset */
|
|
0, /* tp_init */
|
|
0, /* tp_alloc */
|
|
class_new, /* tp_new */
|
|
};
|
|
|
|
int
|
|
PyClass_IsSubclass(PyObject *class, PyObject *base)
|
|
{
|
|
int i, n;
|
|
PyClassObject *cp;
|
|
if (class == base)
|
|
return 1;
|
|
if (PyTuple_Check(base)) {
|
|
n = PyTuple_GET_SIZE(base);
|
|
for (i = 0; i < n; i++) {
|
|
if (PyClass_IsSubclass(class, PyTuple_GET_ITEM(base, i)))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
if (class == NULL || !PyClass_Check(class))
|
|
return 0;
|
|
cp = (PyClassObject *)class;
|
|
n = PyTuple_Size(cp->cl_bases);
|
|
for (i = 0; i < n; i++) {
|
|
if (PyClass_IsSubclass(PyTuple_GetItem(cp->cl_bases, i), base))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Instance objects */
|
|
|
|
PyObject *
|
|
PyInstance_NewRaw(PyObject *klass, PyObject *dict)
|
|
{
|
|
PyInstanceObject *inst;
|
|
|
|
if (!PyClass_Check(klass)) {
|
|
PyErr_BadInternalCall();
|
|
return NULL;
|
|
}
|
|
if (dict == NULL) {
|
|
dict = PyDict_New();
|
|
if (dict == NULL)
|
|
return NULL;
|
|
}
|
|
else {
|
|
if (!PyDict_Check(dict)) {
|
|
PyErr_BadInternalCall();
|
|
return NULL;
|
|
}
|
|
Py_INCREF(dict);
|
|
}
|
|
inst = PyObject_GC_New(PyInstanceObject, &PyInstance_Type);
|
|
if (inst == NULL) {
|
|
Py_DECREF(dict);
|
|
return NULL;
|
|
}
|
|
inst->in_weakreflist = NULL;
|
|
Py_INCREF(klass);
|
|
inst->in_class = (PyClassObject *)klass;
|
|
inst->in_dict = dict;
|
|
_PyObject_GC_TRACK(inst);
|
|
return (PyObject *)inst;
|
|
}
|
|
|
|
PyObject *
|
|
PyInstance_New(PyObject *klass, PyObject *arg, PyObject *kw)
|
|
{
|
|
register PyInstanceObject *inst;
|
|
PyObject *init;
|
|
static PyObject *initstr;
|
|
|
|
inst = (PyInstanceObject *) PyInstance_NewRaw(klass, NULL);
|
|
if (inst == NULL)
|
|
return NULL;
|
|
if (initstr == NULL)
|
|
initstr = PyString_InternFromString("__init__");
|
|
init = instance_getattr2(inst, initstr);
|
|
if (init == NULL) {
|
|
if (PyErr_Occurred()) {
|
|
Py_DECREF(inst);
|
|
return NULL;
|
|
}
|
|
if ((arg != NULL && (!PyTuple_Check(arg) ||
|
|
PyTuple_Size(arg) != 0))
|
|
|| (kw != NULL && (!PyDict_Check(kw) ||
|
|
PyDict_Size(kw) != 0))) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"this constructor takes no arguments");
|
|
Py_DECREF(inst);
|
|
inst = NULL;
|
|
}
|
|
}
|
|
else {
|
|
PyObject *res = PyEval_CallObjectWithKeywords(init, arg, kw);
|
|
Py_DECREF(init);
|
|
if (res == NULL) {
|
|
Py_DECREF(inst);
|
|
inst = NULL;
|
|
}
|
|
else {
|
|
if (res != Py_None) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"__init__() should return None");
|
|
Py_DECREF(inst);
|
|
inst = NULL;
|
|
}
|
|
Py_DECREF(res);
|
|
}
|
|
}
|
|
return (PyObject *)inst;
|
|
}
|
|
|
|
/* Instance methods */
|
|
|
|
PyDoc_STRVAR(instance_doc,
|
|
"instance(class[, dict])\n\
|
|
\n\
|
|
Create an instance without calling its __init__() method.\n\
|
|
The class must be a classic class.\n\
|
|
If present, dict must be a dictionary or None.");
|
|
|
|
static PyObject *
|
|
instance_new(PyTypeObject* type, PyObject* args, PyObject *kw)
|
|
{
|
|
PyObject *klass;
|
|
PyObject *dict = Py_None;
|
|
|
|
if (!PyArg_ParseTuple(args, "O!|O:instance",
|
|
&PyClass_Type, &klass, &dict))
|
|
return NULL;
|
|
|
|
if (dict == Py_None)
|
|
dict = NULL;
|
|
else if (!PyDict_Check(dict)) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"instance() second arg must be dictionary or None");
|
|
return NULL;
|
|
}
|
|
return PyInstance_NewRaw(klass, dict);
|
|
}
|
|
|
|
|
|
static void
|
|
instance_dealloc(register PyInstanceObject *inst)
|
|
{
|
|
PyObject *error_type, *error_value, *error_traceback;
|
|
PyObject *del;
|
|
static PyObject *delstr;
|
|
|
|
_PyObject_GC_UNTRACK(inst);
|
|
if (inst->in_weakreflist != NULL)
|
|
PyObject_ClearWeakRefs((PyObject *) inst);
|
|
|
|
/* Temporarily resurrect the object. */
|
|
assert(inst->ob_type == &PyInstance_Type);
|
|
assert(inst->ob_refcnt == 0);
|
|
inst->ob_refcnt = 1;
|
|
|
|
/* Save the current exception, if any. */
|
|
PyErr_Fetch(&error_type, &error_value, &error_traceback);
|
|
/* Execute __del__ method, if any. */
|
|
if (delstr == NULL)
|
|
delstr = PyString_InternFromString("__del__");
|
|
if ((del = instance_getattr2(inst, delstr)) != NULL) {
|
|
PyObject *res = PyEval_CallObject(del, (PyObject *)NULL);
|
|
if (res == NULL)
|
|
PyErr_WriteUnraisable(del);
|
|
else
|
|
Py_DECREF(res);
|
|
Py_DECREF(del);
|
|
}
|
|
/* Restore the saved exception. */
|
|
PyErr_Restore(error_type, error_value, error_traceback);
|
|
|
|
/* Undo the temporary resurrection; can't use DECREF here, it would
|
|
* cause a recursive call.
|
|
*/
|
|
assert(inst->ob_refcnt > 0);
|
|
if (--inst->ob_refcnt == 0) {
|
|
Py_DECREF(inst->in_class);
|
|
Py_XDECREF(inst->in_dict);
|
|
PyObject_GC_Del(inst);
|
|
}
|
|
else {
|
|
int refcnt = inst->ob_refcnt;
|
|
/* __del__ resurrected it! Make it look like the original
|
|
* Py_DECREF never happened.
|
|
*/
|
|
_Py_NewReference((PyObject *)inst);
|
|
inst->ob_refcnt = refcnt;
|
|
_PyObject_GC_TRACK(inst);
|
|
/* If Py_REF_DEBUG, the original decref dropped _Py_RefTotal,
|
|
* but _Py_NewReference bumped it again, so that's a wash.
|
|
* If Py_TRACE_REFS, _Py_NewReference re-added self to the
|
|
* object chain, so no more to do there either.
|
|
* If COUNT_ALLOCS, the original decref bumped tp_frees, and
|
|
* _Py_NewReference bumped tp_allocs: both of those need to
|
|
* be undone.
|
|
*/
|
|
#ifdef COUNT_ALLOCS
|
|
--inst->ob_type->tp_frees;
|
|
--inst->ob_type->tp_allocs;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static PyObject *
|
|
instance_getattr1(register PyInstanceObject *inst, PyObject *name)
|
|
{
|
|
register PyObject *v;
|
|
register char *sname = PyString_AsString(name);
|
|
if (sname[0] == '_' && sname[1] == '_') {
|
|
if (strcmp(sname, "__dict__") == 0) {
|
|
if (PyEval_GetRestricted()) {
|
|
PyErr_SetString(PyExc_RuntimeError,
|
|
"instance.__dict__ not accessible in restricted mode");
|
|
return NULL;
|
|
}
|
|
Py_INCREF(inst->in_dict);
|
|
return inst->in_dict;
|
|
}
|
|
if (strcmp(sname, "__class__") == 0) {
|
|
Py_INCREF(inst->in_class);
|
|
return (PyObject *)inst->in_class;
|
|
}
|
|
}
|
|
v = instance_getattr2(inst, name);
|
|
if (v == NULL && !PyErr_Occurred()) {
|
|
PyErr_Format(PyExc_AttributeError,
|
|
"%.50s instance has no attribute '%.400s'",
|
|
PyString_AS_STRING(inst->in_class->cl_name), sname);
|
|
}
|
|
return v;
|
|
}
|
|
|
|
static PyObject *
|
|
instance_getattr2(register PyInstanceObject *inst, PyObject *name)
|
|
{
|
|
register PyObject *v;
|
|
PyClassObject *class;
|
|
descrgetfunc f;
|
|
|
|
v = PyDict_GetItem(inst->in_dict, name);
|
|
if (v != NULL) {
|
|
Py_INCREF(v);
|
|
return v;
|
|
}
|
|
v = class_lookup(inst->in_class, name, &class);
|
|
if (v != NULL) {
|
|
Py_INCREF(v);
|
|
f = TP_DESCR_GET(v->ob_type);
|
|
if (f != NULL) {
|
|
PyObject *w = f(v, (PyObject *)inst,
|
|
(PyObject *)(inst->in_class));
|
|
Py_DECREF(v);
|
|
v = w;
|
|
}
|
|
}
|
|
return v;
|
|
}
|
|
|
|
static PyObject *
|
|
instance_getattr(register PyInstanceObject *inst, PyObject *name)
|
|
{
|
|
register PyObject *func, *res;
|
|
res = instance_getattr1(inst, name);
|
|
if (res == NULL && (func = inst->in_class->cl_getattr) != NULL) {
|
|
PyObject *args;
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
args = PyTuple_Pack(2, inst, name);
|
|
if (args == NULL)
|
|
return NULL;
|
|
res = PyEval_CallObject(func, args);
|
|
Py_DECREF(args);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/* See classobject.h comments: this only does dict lookups, and is always
|
|
* safe to call.
|
|
*/
|
|
PyObject *
|
|
_PyInstance_Lookup(PyObject *pinst, PyObject *name)
|
|
{
|
|
PyObject *v;
|
|
PyClassObject *class;
|
|
PyInstanceObject *inst; /* pinst cast to the right type */
|
|
|
|
assert(PyInstance_Check(pinst));
|
|
inst = (PyInstanceObject *)pinst;
|
|
|
|
assert(PyString_Check(name));
|
|
|
|
v = PyDict_GetItem(inst->in_dict, name);
|
|
if (v == NULL)
|
|
v = class_lookup(inst->in_class, name, &class);
|
|
return v;
|
|
}
|
|
|
|
static int
|
|
instance_setattr1(PyInstanceObject *inst, PyObject *name, PyObject *v)
|
|
{
|
|
if (v == NULL) {
|
|
int rv = PyDict_DelItem(inst->in_dict, name);
|
|
if (rv < 0)
|
|
PyErr_Format(PyExc_AttributeError,
|
|
"%.50s instance has no attribute '%.400s'",
|
|
PyString_AS_STRING(inst->in_class->cl_name),
|
|
PyString_AS_STRING(name));
|
|
return rv;
|
|
}
|
|
else
|
|
return PyDict_SetItem(inst->in_dict, name, v);
|
|
}
|
|
|
|
static int
|
|
instance_setattr(PyInstanceObject *inst, PyObject *name, PyObject *v)
|
|
{
|
|
PyObject *func, *args, *res, *tmp;
|
|
char *sname = PyString_AsString(name);
|
|
if (sname[0] == '_' && sname[1] == '_') {
|
|
int n = PyString_Size(name);
|
|
if (sname[n-1] == '_' && sname[n-2] == '_') {
|
|
if (strcmp(sname, "__dict__") == 0) {
|
|
if (PyEval_GetRestricted()) {
|
|
PyErr_SetString(PyExc_RuntimeError,
|
|
"__dict__ not accessible in restricted mode");
|
|
return -1;
|
|
}
|
|
if (v == NULL || !PyDict_Check(v)) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"__dict__ must be set to a dictionary");
|
|
return -1;
|
|
}
|
|
tmp = inst->in_dict;
|
|
Py_INCREF(v);
|
|
inst->in_dict = v;
|
|
Py_DECREF(tmp);
|
|
return 0;
|
|
}
|
|
if (strcmp(sname, "__class__") == 0) {
|
|
if (PyEval_GetRestricted()) {
|
|
PyErr_SetString(PyExc_RuntimeError,
|
|
"__class__ not accessible in restricted mode");
|
|
return -1;
|
|
}
|
|
if (v == NULL || !PyClass_Check(v)) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"__class__ must be set to a class");
|
|
return -1;
|
|
}
|
|
tmp = (PyObject *)(inst->in_class);
|
|
Py_INCREF(v);
|
|
inst->in_class = (PyClassObject *)v;
|
|
Py_DECREF(tmp);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
if (v == NULL)
|
|
func = inst->in_class->cl_delattr;
|
|
else
|
|
func = inst->in_class->cl_setattr;
|
|
if (func == NULL)
|
|
return instance_setattr1(inst, name, v);
|
|
if (v == NULL)
|
|
args = PyTuple_Pack(2, inst, name);
|
|
else
|
|
args = PyTuple_Pack(3, inst, name, v);
|
|
if (args == NULL)
|
|
return -1;
|
|
res = PyEval_CallObject(func, args);
|
|
Py_DECREF(args);
|
|
if (res == NULL)
|
|
return -1;
|
|
Py_DECREF(res);
|
|
return 0;
|
|
}
|
|
|
|
static PyObject *
|
|
instance_repr(PyInstanceObject *inst)
|
|
{
|
|
PyObject *func;
|
|
PyObject *res;
|
|
static PyObject *reprstr;
|
|
|
|
if (reprstr == NULL)
|
|
reprstr = PyString_InternFromString("__repr__");
|
|
func = instance_getattr(inst, reprstr);
|
|
if (func == NULL) {
|
|
PyObject *classname, *mod;
|
|
char *cname;
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
classname = inst->in_class->cl_name;
|
|
mod = PyDict_GetItemString(inst->in_class->cl_dict,
|
|
"__module__");
|
|
if (classname != NULL && PyString_Check(classname))
|
|
cname = PyString_AsString(classname);
|
|
else
|
|
cname = "?";
|
|
if (mod == NULL || !PyString_Check(mod))
|
|
return PyString_FromFormat("<?.%s instance at %p>",
|
|
cname, inst);
|
|
else
|
|
return PyString_FromFormat("<%s.%s instance at %p>",
|
|
PyString_AsString(mod),
|
|
cname, inst);
|
|
}
|
|
res = PyEval_CallObject(func, (PyObject *)NULL);
|
|
Py_DECREF(func);
|
|
return res;
|
|
}
|
|
|
|
static PyObject *
|
|
instance_str(PyInstanceObject *inst)
|
|
{
|
|
PyObject *func;
|
|
PyObject *res;
|
|
static PyObject *strstr;
|
|
|
|
if (strstr == NULL)
|
|
strstr = PyString_InternFromString("__str__");
|
|
func = instance_getattr(inst, strstr);
|
|
if (func == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
return instance_repr(inst);
|
|
}
|
|
res = PyEval_CallObject(func, (PyObject *)NULL);
|
|
Py_DECREF(func);
|
|
return res;
|
|
}
|
|
|
|
static long
|
|
instance_hash(PyInstanceObject *inst)
|
|
{
|
|
PyObject *func;
|
|
PyObject *res;
|
|
long outcome;
|
|
static PyObject *hashstr, *eqstr, *cmpstr;
|
|
|
|
if (hashstr == NULL)
|
|
hashstr = PyString_InternFromString("__hash__");
|
|
func = instance_getattr(inst, hashstr);
|
|
if (func == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return -1;
|
|
PyErr_Clear();
|
|
/* If there is no __eq__ and no __cmp__ method, we hash on the
|
|
address. If an __eq__ or __cmp__ method exists, there must
|
|
be a __hash__. */
|
|
if (eqstr == NULL)
|
|
eqstr = PyString_InternFromString("__eq__");
|
|
func = instance_getattr(inst, eqstr);
|
|
if (func == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return -1;
|
|
PyErr_Clear();
|
|
if (cmpstr == NULL)
|
|
cmpstr = PyString_InternFromString("__cmp__");
|
|
func = instance_getattr(inst, cmpstr);
|
|
if (func == NULL) {
|
|
if (!PyErr_ExceptionMatches(
|
|
PyExc_AttributeError))
|
|
return -1;
|
|
PyErr_Clear();
|
|
return _Py_HashPointer(inst);
|
|
}
|
|
}
|
|
Py_XDECREF(func);
|
|
PyErr_SetString(PyExc_TypeError, "unhashable instance");
|
|
return -1;
|
|
}
|
|
res = PyEval_CallObject(func, (PyObject *)NULL);
|
|
Py_DECREF(func);
|
|
if (res == NULL)
|
|
return -1;
|
|
if (PyInt_Check(res)) {
|
|
outcome = PyInt_AsLong(res);
|
|
if (outcome == -1)
|
|
outcome = -2;
|
|
}
|
|
else {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"__hash__() should return an int");
|
|
outcome = -1;
|
|
}
|
|
Py_DECREF(res);
|
|
return outcome;
|
|
}
|
|
|
|
static int
|
|
instance_traverse(PyInstanceObject *o, visitproc visit, void *arg)
|
|
{
|
|
int err;
|
|
if (o->in_class) {
|
|
err = visit((PyObject *)(o->in_class), arg);
|
|
if (err)
|
|
return err;
|
|
}
|
|
if (o->in_dict) {
|
|
err = visit(o->in_dict, arg);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static PyObject *getitemstr, *setitemstr, *delitemstr, *lenstr;
|
|
static PyObject *iterstr, *nextstr;
|
|
|
|
static int
|
|
instance_length(PyInstanceObject *inst)
|
|
{
|
|
PyObject *func;
|
|
PyObject *res;
|
|
int outcome;
|
|
|
|
if (lenstr == NULL)
|
|
lenstr = PyString_InternFromString("__len__");
|
|
func = instance_getattr(inst, lenstr);
|
|
if (func == NULL)
|
|
return -1;
|
|
res = PyEval_CallObject(func, (PyObject *)NULL);
|
|
Py_DECREF(func);
|
|
if (res == NULL)
|
|
return -1;
|
|
if (PyInt_Check(res)) {
|
|
outcome = PyInt_AsLong(res);
|
|
if (outcome < 0)
|
|
PyErr_SetString(PyExc_ValueError,
|
|
"__len__() should return >= 0");
|
|
}
|
|
else {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"__len__() should return an int");
|
|
outcome = -1;
|
|
}
|
|
Py_DECREF(res);
|
|
return outcome;
|
|
}
|
|
|
|
static PyObject *
|
|
instance_subscript(PyInstanceObject *inst, PyObject *key)
|
|
{
|
|
PyObject *func;
|
|
PyObject *arg;
|
|
PyObject *res;
|
|
|
|
if (getitemstr == NULL)
|
|
getitemstr = PyString_InternFromString("__getitem__");
|
|
func = instance_getattr(inst, getitemstr);
|
|
if (func == NULL)
|
|
return NULL;
|
|
arg = PyTuple_Pack(1, key);
|
|
if (arg == NULL) {
|
|
Py_DECREF(func);
|
|
return NULL;
|
|
}
|
|
res = PyEval_CallObject(func, arg);
|
|
Py_DECREF(func);
|
|
Py_DECREF(arg);
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
instance_ass_subscript(PyInstanceObject *inst, PyObject *key, PyObject *value)
|
|
{
|
|
PyObject *func;
|
|
PyObject *arg;
|
|
PyObject *res;
|
|
|
|
if (value == NULL) {
|
|
if (delitemstr == NULL)
|
|
delitemstr = PyString_InternFromString("__delitem__");
|
|
func = instance_getattr(inst, delitemstr);
|
|
}
|
|
else {
|
|
if (setitemstr == NULL)
|
|
setitemstr = PyString_InternFromString("__setitem__");
|
|
func = instance_getattr(inst, setitemstr);
|
|
}
|
|
if (func == NULL)
|
|
return -1;
|
|
if (value == NULL)
|
|
arg = PyTuple_Pack(1, key);
|
|
else
|
|
arg = PyTuple_Pack(2, key, value);
|
|
if (arg == NULL) {
|
|
Py_DECREF(func);
|
|
return -1;
|
|
}
|
|
res = PyEval_CallObject(func, arg);
|
|
Py_DECREF(func);
|
|
Py_DECREF(arg);
|
|
if (res == NULL)
|
|
return -1;
|
|
Py_DECREF(res);
|
|
return 0;
|
|
}
|
|
|
|
static PyMappingMethods instance_as_mapping = {
|
|
(inquiry)instance_length, /* mp_length */
|
|
(binaryfunc)instance_subscript, /* mp_subscript */
|
|
(objobjargproc)instance_ass_subscript, /* mp_ass_subscript */
|
|
};
|
|
|
|
static PyObject *
|
|
instance_item(PyInstanceObject *inst, int i)
|
|
{
|
|
PyObject *func, *arg, *res;
|
|
|
|
if (getitemstr == NULL)
|
|
getitemstr = PyString_InternFromString("__getitem__");
|
|
func = instance_getattr(inst, getitemstr);
|
|
if (func == NULL)
|
|
return NULL;
|
|
arg = Py_BuildValue("(i)", i);
|
|
if (arg == NULL) {
|
|
Py_DECREF(func);
|
|
return NULL;
|
|
}
|
|
res = PyEval_CallObject(func, arg);
|
|
Py_DECREF(func);
|
|
Py_DECREF(arg);
|
|
return res;
|
|
}
|
|
|
|
static PyObject *
|
|
sliceobj_from_intint(int i, int j)
|
|
{
|
|
PyObject *start, *end, *res;
|
|
|
|
start = PyInt_FromLong((long)i);
|
|
if (!start)
|
|
return NULL;
|
|
|
|
end = PyInt_FromLong((long)j);
|
|
if (!end) {
|
|
Py_DECREF(start);
|
|
return NULL;
|
|
}
|
|
res = PySlice_New(start, end, NULL);
|
|
Py_DECREF(start);
|
|
Py_DECREF(end);
|
|
return res;
|
|
}
|
|
|
|
|
|
static PyObject *
|
|
instance_slice(PyInstanceObject *inst, int i, int j)
|
|
{
|
|
PyObject *func, *arg, *res;
|
|
static PyObject *getslicestr;
|
|
|
|
if (getslicestr == NULL)
|
|
getslicestr = PyString_InternFromString("__getslice__");
|
|
func = instance_getattr(inst, getslicestr);
|
|
|
|
if (func == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
|
|
if (getitemstr == NULL)
|
|
getitemstr = PyString_InternFromString("__getitem__");
|
|
func = instance_getattr(inst, getitemstr);
|
|
if (func == NULL)
|
|
return NULL;
|
|
arg = Py_BuildValue("(N)", sliceobj_from_intint(i, j));
|
|
} else
|
|
arg = Py_BuildValue("(ii)", i, j);
|
|
|
|
if (arg == NULL) {
|
|
Py_DECREF(func);
|
|
return NULL;
|
|
}
|
|
res = PyEval_CallObject(func, arg);
|
|
Py_DECREF(func);
|
|
Py_DECREF(arg);
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
instance_ass_item(PyInstanceObject *inst, int i, PyObject *item)
|
|
{
|
|
PyObject *func, *arg, *res;
|
|
|
|
if (item == NULL) {
|
|
if (delitemstr == NULL)
|
|
delitemstr = PyString_InternFromString("__delitem__");
|
|
func = instance_getattr(inst, delitemstr);
|
|
}
|
|
else {
|
|
if (setitemstr == NULL)
|
|
setitemstr = PyString_InternFromString("__setitem__");
|
|
func = instance_getattr(inst, setitemstr);
|
|
}
|
|
if (func == NULL)
|
|
return -1;
|
|
if (item == NULL)
|
|
arg = Py_BuildValue("i", i);
|
|
else
|
|
arg = Py_BuildValue("(iO)", i, item);
|
|
if (arg == NULL) {
|
|
Py_DECREF(func);
|
|
return -1;
|
|
}
|
|
res = PyEval_CallObject(func, arg);
|
|
Py_DECREF(func);
|
|
Py_DECREF(arg);
|
|
if (res == NULL)
|
|
return -1;
|
|
Py_DECREF(res);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
instance_ass_slice(PyInstanceObject *inst, int i, int j, PyObject *value)
|
|
{
|
|
PyObject *func, *arg, *res;
|
|
static PyObject *setslicestr, *delslicestr;
|
|
|
|
if (value == NULL) {
|
|
if (delslicestr == NULL)
|
|
delslicestr =
|
|
PyString_InternFromString("__delslice__");
|
|
func = instance_getattr(inst, delslicestr);
|
|
if (func == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return -1;
|
|
PyErr_Clear();
|
|
if (delitemstr == NULL)
|
|
delitemstr =
|
|
PyString_InternFromString("__delitem__");
|
|
func = instance_getattr(inst, delitemstr);
|
|
if (func == NULL)
|
|
return -1;
|
|
|
|
arg = Py_BuildValue("(N)",
|
|
sliceobj_from_intint(i, j));
|
|
} else
|
|
arg = Py_BuildValue("(ii)", i, j);
|
|
}
|
|
else {
|
|
if (setslicestr == NULL)
|
|
setslicestr =
|
|
PyString_InternFromString("__setslice__");
|
|
func = instance_getattr(inst, setslicestr);
|
|
if (func == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return -1;
|
|
PyErr_Clear();
|
|
if (setitemstr == NULL)
|
|
setitemstr =
|
|
PyString_InternFromString("__setitem__");
|
|
func = instance_getattr(inst, setitemstr);
|
|
if (func == NULL)
|
|
return -1;
|
|
|
|
arg = Py_BuildValue("(NO)",
|
|
sliceobj_from_intint(i, j), value);
|
|
} else
|
|
arg = Py_BuildValue("(iiO)", i, j, value);
|
|
}
|
|
if (arg == NULL) {
|
|
Py_DECREF(func);
|
|
return -1;
|
|
}
|
|
res = PyEval_CallObject(func, arg);
|
|
Py_DECREF(func);
|
|
Py_DECREF(arg);
|
|
if (res == NULL)
|
|
return -1;
|
|
Py_DECREF(res);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
instance_contains(PyInstanceObject *inst, PyObject *member)
|
|
{
|
|
static PyObject *__contains__;
|
|
PyObject *func;
|
|
|
|
/* Try __contains__ first.
|
|
* If that can't be done, try iterator-based searching.
|
|
*/
|
|
|
|
if(__contains__ == NULL) {
|
|
__contains__ = PyString_InternFromString("__contains__");
|
|
if(__contains__ == NULL)
|
|
return -1;
|
|
}
|
|
func = instance_getattr(inst, __contains__);
|
|
if (func) {
|
|
PyObject *res;
|
|
int ret;
|
|
PyObject *arg = PyTuple_Pack(1, member);
|
|
if(arg == NULL) {
|
|
Py_DECREF(func);
|
|
return -1;
|
|
}
|
|
res = PyEval_CallObject(func, arg);
|
|
Py_DECREF(func);
|
|
Py_DECREF(arg);
|
|
if(res == NULL)
|
|
return -1;
|
|
ret = PyObject_IsTrue(res);
|
|
Py_DECREF(res);
|
|
return ret;
|
|
}
|
|
|
|
/* Couldn't find __contains__. */
|
|
if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
|
|
/* Assume the failure was simply due to that there is no
|
|
* __contains__ attribute, and try iterating instead.
|
|
*/
|
|
PyErr_Clear();
|
|
return _PySequence_IterSearch((PyObject *)inst, member,
|
|
PY_ITERSEARCH_CONTAINS);
|
|
}
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
static PySequenceMethods
|
|
instance_as_sequence = {
|
|
(inquiry)instance_length, /* sq_length */
|
|
0, /* sq_concat */
|
|
0, /* sq_repeat */
|
|
(intargfunc)instance_item, /* sq_item */
|
|
(intintargfunc)instance_slice, /* sq_slice */
|
|
(intobjargproc)instance_ass_item, /* sq_ass_item */
|
|
(intintobjargproc)instance_ass_slice, /* sq_ass_slice */
|
|
(objobjproc)instance_contains, /* sq_contains */
|
|
};
|
|
|
|
static PyObject *
|
|
generic_unary_op(PyInstanceObject *self, PyObject *methodname)
|
|
{
|
|
PyObject *func, *res;
|
|
|
|
if ((func = instance_getattr(self, methodname)) == NULL)
|
|
return NULL;
|
|
res = PyEval_CallObject(func, (PyObject *)NULL);
|
|
Py_DECREF(func);
|
|
return res;
|
|
}
|
|
|
|
static PyObject *
|
|
generic_binary_op(PyObject *v, PyObject *w, char *opname)
|
|
{
|
|
PyObject *result;
|
|
PyObject *args;
|
|
PyObject *func = PyObject_GetAttrString(v, opname);
|
|
if (func == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
Py_INCREF(Py_NotImplemented);
|
|
return Py_NotImplemented;
|
|
}
|
|
args = PyTuple_Pack(1, w);
|
|
if (args == NULL) {
|
|
Py_DECREF(func);
|
|
return NULL;
|
|
}
|
|
result = PyEval_CallObject(func, args);
|
|
Py_DECREF(args);
|
|
Py_DECREF(func);
|
|
return result;
|
|
}
|
|
|
|
|
|
static PyObject *coerce_obj;
|
|
|
|
/* Try one half of a binary operator involving a class instance. */
|
|
static PyObject *
|
|
half_binop(PyObject *v, PyObject *w, char *opname, binaryfunc thisfunc,
|
|
int swapped)
|
|
{
|
|
PyObject *args;
|
|
PyObject *coercefunc;
|
|
PyObject *coerced = NULL;
|
|
PyObject *v1;
|
|
PyObject *result;
|
|
|
|
if (!PyInstance_Check(v)) {
|
|
Py_INCREF(Py_NotImplemented);
|
|
return Py_NotImplemented;
|
|
}
|
|
|
|
if (coerce_obj == NULL) {
|
|
coerce_obj = PyString_InternFromString("__coerce__");
|
|
if (coerce_obj == NULL)
|
|
return NULL;
|
|
}
|
|
coercefunc = PyObject_GetAttr(v, coerce_obj);
|
|
if (coercefunc == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
return generic_binary_op(v, w, opname);
|
|
}
|
|
|
|
args = PyTuple_Pack(1, w);
|
|
if (args == NULL) {
|
|
Py_DECREF(coercefunc);
|
|
return NULL;
|
|
}
|
|
coerced = PyEval_CallObject(coercefunc, args);
|
|
Py_DECREF(args);
|
|
Py_DECREF(coercefunc);
|
|
if (coerced == NULL) {
|
|
return NULL;
|
|
}
|
|
if (coerced == Py_None || coerced == Py_NotImplemented) {
|
|
Py_DECREF(coerced);
|
|
return generic_binary_op(v, w, opname);
|
|
}
|
|
if (!PyTuple_Check(coerced) || PyTuple_Size(coerced) != 2) {
|
|
Py_DECREF(coerced);
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"coercion should return None or 2-tuple");
|
|
return NULL;
|
|
}
|
|
v1 = PyTuple_GetItem(coerced, 0);
|
|
w = PyTuple_GetItem(coerced, 1);
|
|
if (v1->ob_type == v->ob_type && PyInstance_Check(v)) {
|
|
/* prevent recursion if __coerce__ returns self as the first
|
|
* argument */
|
|
result = generic_binary_op(v1, w, opname);
|
|
} else {
|
|
if (swapped)
|
|
result = (thisfunc)(w, v1);
|
|
else
|
|
result = (thisfunc)(v1, w);
|
|
}
|
|
Py_DECREF(coerced);
|
|
return result;
|
|
}
|
|
|
|
/* Implement a binary operator involving at least one class instance. */
|
|
static PyObject *
|
|
do_binop(PyObject *v, PyObject *w, char *opname, char *ropname,
|
|
binaryfunc thisfunc)
|
|
{
|
|
PyObject *result = half_binop(v, w, opname, thisfunc, 0);
|
|
if (result == Py_NotImplemented) {
|
|
Py_DECREF(result);
|
|
result = half_binop(w, v, ropname, thisfunc, 1);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static PyObject *
|
|
do_binop_inplace(PyObject *v, PyObject *w, char *iopname, char *opname,
|
|
char *ropname, binaryfunc thisfunc)
|
|
{
|
|
PyObject *result = half_binop(v, w, iopname, thisfunc, 0);
|
|
if (result == Py_NotImplemented) {
|
|
Py_DECREF(result);
|
|
result = do_binop(v, w, opname, ropname, thisfunc);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
instance_coerce(PyObject **pv, PyObject **pw)
|
|
{
|
|
PyObject *v = *pv;
|
|
PyObject *w = *pw;
|
|
PyObject *coercefunc;
|
|
PyObject *args;
|
|
PyObject *coerced;
|
|
|
|
if (coerce_obj == NULL) {
|
|
coerce_obj = PyString_InternFromString("__coerce__");
|
|
if (coerce_obj == NULL)
|
|
return -1;
|
|
}
|
|
coercefunc = PyObject_GetAttr(v, coerce_obj);
|
|
if (coercefunc == NULL) {
|
|
/* No __coerce__ method */
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return -1;
|
|
PyErr_Clear();
|
|
return 1;
|
|
}
|
|
/* Has __coerce__ method: call it */
|
|
args = PyTuple_Pack(1, w);
|
|
if (args == NULL) {
|
|
return -1;
|
|
}
|
|
coerced = PyEval_CallObject(coercefunc, args);
|
|
Py_DECREF(args);
|
|
Py_DECREF(coercefunc);
|
|
if (coerced == NULL) {
|
|
/* __coerce__ call raised an exception */
|
|
return -1;
|
|
}
|
|
if (coerced == Py_None || coerced == Py_NotImplemented) {
|
|
/* __coerce__ says "I can't do it" */
|
|
Py_DECREF(coerced);
|
|
return 1;
|
|
}
|
|
if (!PyTuple_Check(coerced) || PyTuple_Size(coerced) != 2) {
|
|
/* __coerce__ return value is malformed */
|
|
Py_DECREF(coerced);
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"coercion should return None or 2-tuple");
|
|
return -1;
|
|
}
|
|
/* __coerce__ returned two new values */
|
|
*pv = PyTuple_GetItem(coerced, 0);
|
|
*pw = PyTuple_GetItem(coerced, 1);
|
|
Py_INCREF(*pv);
|
|
Py_INCREF(*pw);
|
|
Py_DECREF(coerced);
|
|
return 0;
|
|
}
|
|
|
|
#define UNARY(funcname, methodname) \
|
|
static PyObject *funcname(PyInstanceObject *self) { \
|
|
static PyObject *o; \
|
|
if (o == NULL) o = PyString_InternFromString(methodname); \
|
|
return generic_unary_op(self, o); \
|
|
}
|
|
|
|
#define BINARY(f, m, n) \
|
|
static PyObject *f(PyObject *v, PyObject *w) { \
|
|
return do_binop(v, w, "__" m "__", "__r" m "__", n); \
|
|
}
|
|
|
|
#define BINARY_INPLACE(f, m, n) \
|
|
static PyObject *f(PyObject *v, PyObject *w) { \
|
|
return do_binop_inplace(v, w, "__i" m "__", "__" m "__", \
|
|
"__r" m "__", n); \
|
|
}
|
|
|
|
UNARY(instance_neg, "__neg__")
|
|
UNARY(instance_pos, "__pos__")
|
|
UNARY(instance_abs, "__abs__")
|
|
|
|
BINARY(instance_or, "or", PyNumber_Or)
|
|
BINARY(instance_and, "and", PyNumber_And)
|
|
BINARY(instance_xor, "xor", PyNumber_Xor)
|
|
BINARY(instance_lshift, "lshift", PyNumber_Lshift)
|
|
BINARY(instance_rshift, "rshift", PyNumber_Rshift)
|
|
BINARY(instance_add, "add", PyNumber_Add)
|
|
BINARY(instance_sub, "sub", PyNumber_Subtract)
|
|
BINARY(instance_mul, "mul", PyNumber_Multiply)
|
|
BINARY(instance_div, "div", PyNumber_Divide)
|
|
BINARY(instance_mod, "mod", PyNumber_Remainder)
|
|
BINARY(instance_divmod, "divmod", PyNumber_Divmod)
|
|
BINARY(instance_floordiv, "floordiv", PyNumber_FloorDivide)
|
|
BINARY(instance_truediv, "truediv", PyNumber_TrueDivide)
|
|
|
|
BINARY_INPLACE(instance_ior, "or", PyNumber_InPlaceOr)
|
|
BINARY_INPLACE(instance_ixor, "xor", PyNumber_InPlaceXor)
|
|
BINARY_INPLACE(instance_iand, "and", PyNumber_InPlaceAnd)
|
|
BINARY_INPLACE(instance_ilshift, "lshift", PyNumber_InPlaceLshift)
|
|
BINARY_INPLACE(instance_irshift, "rshift", PyNumber_InPlaceRshift)
|
|
BINARY_INPLACE(instance_iadd, "add", PyNumber_InPlaceAdd)
|
|
BINARY_INPLACE(instance_isub, "sub", PyNumber_InPlaceSubtract)
|
|
BINARY_INPLACE(instance_imul, "mul", PyNumber_InPlaceMultiply)
|
|
BINARY_INPLACE(instance_idiv, "div", PyNumber_InPlaceDivide)
|
|
BINARY_INPLACE(instance_imod, "mod", PyNumber_InPlaceRemainder)
|
|
BINARY_INPLACE(instance_ifloordiv, "floordiv", PyNumber_InPlaceFloorDivide)
|
|
BINARY_INPLACE(instance_itruediv, "truediv", PyNumber_InPlaceTrueDivide)
|
|
|
|
/* Try a 3-way comparison, returning an int; v is an instance. Return:
|
|
-2 for an exception;
|
|
-1 if v < w;
|
|
0 if v == w;
|
|
1 if v > w;
|
|
2 if this particular 3-way comparison is not implemented or undefined.
|
|
*/
|
|
static int
|
|
half_cmp(PyObject *v, PyObject *w)
|
|
{
|
|
static PyObject *cmp_obj;
|
|
PyObject *args;
|
|
PyObject *cmp_func;
|
|
PyObject *result;
|
|
long l;
|
|
|
|
assert(PyInstance_Check(v));
|
|
|
|
if (cmp_obj == NULL) {
|
|
cmp_obj = PyString_InternFromString("__cmp__");
|
|
if (cmp_obj == NULL)
|
|
return -2;
|
|
}
|
|
|
|
cmp_func = PyObject_GetAttr(v, cmp_obj);
|
|
if (cmp_func == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return -2;
|
|
PyErr_Clear();
|
|
return 2;
|
|
}
|
|
|
|
args = PyTuple_Pack(1, w);
|
|
if (args == NULL) {
|
|
Py_DECREF(cmp_func);
|
|
return -2;
|
|
}
|
|
|
|
result = PyEval_CallObject(cmp_func, args);
|
|
Py_DECREF(args);
|
|
Py_DECREF(cmp_func);
|
|
|
|
if (result == NULL)
|
|
return -2;
|
|
|
|
if (result == Py_NotImplemented) {
|
|
Py_DECREF(result);
|
|
return 2;
|
|
}
|
|
|
|
l = PyInt_AsLong(result);
|
|
Py_DECREF(result);
|
|
if (l == -1 && PyErr_Occurred()) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"comparison did not return an int");
|
|
return -2;
|
|
}
|
|
|
|
return l < 0 ? -1 : l > 0 ? 1 : 0;
|
|
}
|
|
|
|
/* Try a 3-way comparison, returning an int; either v or w is an instance.
|
|
We first try a coercion. Return:
|
|
-2 for an exception;
|
|
-1 if v < w;
|
|
0 if v == w;
|
|
1 if v > w;
|
|
2 if this particular 3-way comparison is not implemented or undefined.
|
|
THIS IS ONLY CALLED FROM object.c!
|
|
*/
|
|
static int
|
|
instance_compare(PyObject *v, PyObject *w)
|
|
{
|
|
int c;
|
|
|
|
c = PyNumber_CoerceEx(&v, &w);
|
|
if (c < 0)
|
|
return -2;
|
|
if (c == 0) {
|
|
/* If neither is now an instance, use regular comparison */
|
|
if (!PyInstance_Check(v) && !PyInstance_Check(w)) {
|
|
c = PyObject_Compare(v, w);
|
|
Py_DECREF(v);
|
|
Py_DECREF(w);
|
|
if (PyErr_Occurred())
|
|
return -2;
|
|
return c < 0 ? -1 : c > 0 ? 1 : 0;
|
|
}
|
|
}
|
|
else {
|
|
/* The coercion didn't do anything.
|
|
Treat this the same as returning v and w unchanged. */
|
|
Py_INCREF(v);
|
|
Py_INCREF(w);
|
|
}
|
|
|
|
if (PyInstance_Check(v)) {
|
|
c = half_cmp(v, w);
|
|
if (c <= 1) {
|
|
Py_DECREF(v);
|
|
Py_DECREF(w);
|
|
return c;
|
|
}
|
|
}
|
|
if (PyInstance_Check(w)) {
|
|
c = half_cmp(w, v);
|
|
if (c <= 1) {
|
|
Py_DECREF(v);
|
|
Py_DECREF(w);
|
|
if (c >= -1)
|
|
c = -c;
|
|
return c;
|
|
}
|
|
}
|
|
Py_DECREF(v);
|
|
Py_DECREF(w);
|
|
return 2;
|
|
}
|
|
|
|
static int
|
|
instance_nonzero(PyInstanceObject *self)
|
|
{
|
|
PyObject *func, *res;
|
|
long outcome;
|
|
static PyObject *nonzerostr;
|
|
|
|
if (nonzerostr == NULL)
|
|
nonzerostr = PyString_InternFromString("__nonzero__");
|
|
if ((func = instance_getattr(self, nonzerostr)) == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return -1;
|
|
PyErr_Clear();
|
|
if (lenstr == NULL)
|
|
lenstr = PyString_InternFromString("__len__");
|
|
if ((func = instance_getattr(self, lenstr)) == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return -1;
|
|
PyErr_Clear();
|
|
/* Fall back to the default behavior:
|
|
all instances are nonzero */
|
|
return 1;
|
|
}
|
|
}
|
|
res = PyEval_CallObject(func, (PyObject *)NULL);
|
|
Py_DECREF(func);
|
|
if (res == NULL)
|
|
return -1;
|
|
if (!PyInt_Check(res)) {
|
|
Py_DECREF(res);
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"__nonzero__ should return an int");
|
|
return -1;
|
|
}
|
|
outcome = PyInt_AsLong(res);
|
|
Py_DECREF(res);
|
|
if (outcome < 0) {
|
|
PyErr_SetString(PyExc_ValueError,
|
|
"__nonzero__ should return >= 0");
|
|
return -1;
|
|
}
|
|
return outcome > 0;
|
|
}
|
|
|
|
UNARY(instance_invert, "__invert__")
|
|
UNARY(instance_int, "__int__")
|
|
UNARY(instance_long, "__long__")
|
|
UNARY(instance_float, "__float__")
|
|
UNARY(instance_oct, "__oct__")
|
|
UNARY(instance_hex, "__hex__")
|
|
|
|
static PyObject *
|
|
bin_power(PyObject *v, PyObject *w)
|
|
{
|
|
return PyNumber_Power(v, w, Py_None);
|
|
}
|
|
|
|
/* This version is for ternary calls only (z != None) */
|
|
static PyObject *
|
|
instance_pow(PyObject *v, PyObject *w, PyObject *z)
|
|
{
|
|
if (z == Py_None) {
|
|
return do_binop(v, w, "__pow__", "__rpow__", bin_power);
|
|
}
|
|
else {
|
|
PyObject *func;
|
|
PyObject *args;
|
|
PyObject *result;
|
|
|
|
/* XXX Doesn't do coercions... */
|
|
func = PyObject_GetAttrString(v, "__pow__");
|
|
if (func == NULL)
|
|
return NULL;
|
|
args = PyTuple_Pack(2, w, z);
|
|
if (args == NULL) {
|
|
Py_DECREF(func);
|
|
return NULL;
|
|
}
|
|
result = PyEval_CallObject(func, args);
|
|
Py_DECREF(func);
|
|
Py_DECREF(args);
|
|
return result;
|
|
}
|
|
}
|
|
|
|
static PyObject *
|
|
bin_inplace_power(PyObject *v, PyObject *w)
|
|
{
|
|
return PyNumber_InPlacePower(v, w, Py_None);
|
|
}
|
|
|
|
|
|
static PyObject *
|
|
instance_ipow(PyObject *v, PyObject *w, PyObject *z)
|
|
{
|
|
if (z == Py_None) {
|
|
return do_binop_inplace(v, w, "__ipow__", "__pow__",
|
|
"__rpow__", bin_inplace_power);
|
|
}
|
|
else {
|
|
/* XXX Doesn't do coercions... */
|
|
PyObject *func;
|
|
PyObject *args;
|
|
PyObject *result;
|
|
|
|
func = PyObject_GetAttrString(v, "__ipow__");
|
|
if (func == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
return instance_pow(v, w, z);
|
|
}
|
|
args = PyTuple_Pack(2, w, z);
|
|
if (args == NULL) {
|
|
Py_DECREF(func);
|
|
return NULL;
|
|
}
|
|
result = PyEval_CallObject(func, args);
|
|
Py_DECREF(func);
|
|
Py_DECREF(args);
|
|
return result;
|
|
}
|
|
}
|
|
|
|
|
|
/* Map rich comparison operators to their __xx__ namesakes */
|
|
#define NAME_OPS 6
|
|
static PyObject **name_op = NULL;
|
|
|
|
static int
|
|
init_name_op(void)
|
|
{
|
|
int i;
|
|
char *_name_op[] = {
|
|
"__lt__",
|
|
"__le__",
|
|
"__eq__",
|
|
"__ne__",
|
|
"__gt__",
|
|
"__ge__",
|
|
};
|
|
|
|
name_op = (PyObject **)malloc(sizeof(PyObject *) * NAME_OPS);
|
|
if (name_op == NULL)
|
|
return -1;
|
|
for (i = 0; i < NAME_OPS; ++i) {
|
|
name_op[i] = PyString_InternFromString(_name_op[i]);
|
|
if (name_op[i] == NULL)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static PyObject *
|
|
half_richcompare(PyObject *v, PyObject *w, int op)
|
|
{
|
|
PyObject *method;
|
|
PyObject *args;
|
|
PyObject *res;
|
|
|
|
assert(PyInstance_Check(v));
|
|
|
|
if (name_op == NULL) {
|
|
if (init_name_op() < 0)
|
|
return NULL;
|
|
}
|
|
/* If the instance doesn't define an __getattr__ method, use
|
|
instance_getattr2 directly because it will not set an
|
|
exception on failure. */
|
|
if (((PyInstanceObject *)v)->in_class->cl_getattr == NULL)
|
|
method = instance_getattr2((PyInstanceObject *)v,
|
|
name_op[op]);
|
|
else
|
|
method = PyObject_GetAttr(v, name_op[op]);
|
|
if (method == NULL) {
|
|
if (PyErr_Occurred()) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
}
|
|
res = Py_NotImplemented;
|
|
Py_INCREF(res);
|
|
return res;
|
|
}
|
|
|
|
args = PyTuple_Pack(1, w);
|
|
if (args == NULL) {
|
|
Py_DECREF(method);
|
|
return NULL;
|
|
}
|
|
|
|
res = PyEval_CallObject(method, args);
|
|
Py_DECREF(args);
|
|
Py_DECREF(method);
|
|
|
|
return res;
|
|
}
|
|
|
|
/* Map rich comparison operators to their swapped version, e.g. LT --> GT */
|
|
static int swapped_op[] = {Py_GT, Py_GE, Py_EQ, Py_NE, Py_LT, Py_LE};
|
|
|
|
static PyObject *
|
|
instance_richcompare(PyObject *v, PyObject *w, int op)
|
|
{
|
|
PyObject *res;
|
|
|
|
if (PyInstance_Check(v)) {
|
|
res = half_richcompare(v, w, op);
|
|
if (res != Py_NotImplemented)
|
|
return res;
|
|
Py_DECREF(res);
|
|
}
|
|
|
|
if (PyInstance_Check(w)) {
|
|
res = half_richcompare(w, v, swapped_op[op]);
|
|
if (res != Py_NotImplemented)
|
|
return res;
|
|
Py_DECREF(res);
|
|
}
|
|
|
|
Py_INCREF(Py_NotImplemented);
|
|
return Py_NotImplemented;
|
|
}
|
|
|
|
|
|
/* Get the iterator */
|
|
static PyObject *
|
|
instance_getiter(PyInstanceObject *self)
|
|
{
|
|
PyObject *func;
|
|
|
|
if (iterstr == NULL) {
|
|
iterstr = PyString_InternFromString("__iter__");
|
|
if (iterstr == NULL)
|
|
return NULL;
|
|
}
|
|
if (getitemstr == NULL) {
|
|
getitemstr = PyString_InternFromString("__getitem__");
|
|
if (getitemstr == NULL)
|
|
return NULL;
|
|
}
|
|
|
|
if ((func = instance_getattr(self, iterstr)) != NULL) {
|
|
PyObject *res = PyEval_CallObject(func, (PyObject *)NULL);
|
|
Py_DECREF(func);
|
|
if (res != NULL && !PyIter_Check(res)) {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"__iter__ returned non-iterator "
|
|
"of type '%.100s'",
|
|
res->ob_type->tp_name);
|
|
Py_DECREF(res);
|
|
res = NULL;
|
|
}
|
|
return res;
|
|
}
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
if ((func = instance_getattr(self, getitemstr)) == NULL) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"iteration over non-sequence");
|
|
return NULL;
|
|
}
|
|
Py_DECREF(func);
|
|
return PySeqIter_New((PyObject *)self);
|
|
}
|
|
|
|
|
|
/* Call the iterator's next */
|
|
static PyObject *
|
|
instance_iternext(PyInstanceObject *self)
|
|
{
|
|
PyObject *func;
|
|
|
|
if (nextstr == NULL)
|
|
nextstr = PyString_InternFromString("next");
|
|
|
|
if ((func = instance_getattr(self, nextstr)) != NULL) {
|
|
PyObject *res = PyEval_CallObject(func, (PyObject *)NULL);
|
|
Py_DECREF(func);
|
|
if (res != NULL) {
|
|
return res;
|
|
}
|
|
if (PyErr_ExceptionMatches(PyExc_StopIteration)) {
|
|
PyErr_Clear();
|
|
return NULL;
|
|
}
|
|
return NULL;
|
|
}
|
|
PyErr_SetString(PyExc_TypeError, "instance has no next() method");
|
|
return NULL;
|
|
}
|
|
|
|
static PyObject *
|
|
instance_call(PyObject *func, PyObject *arg, PyObject *kw)
|
|
{
|
|
PyObject *res, *call = PyObject_GetAttrString(func, "__call__");
|
|
if (call == NULL) {
|
|
PyInstanceObject *inst = (PyInstanceObject*) func;
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
PyErr_Format(PyExc_AttributeError,
|
|
"%.200s instance has no __call__ method",
|
|
PyString_AsString(inst->in_class->cl_name));
|
|
return NULL;
|
|
}
|
|
/* We must check and increment the recursion depth here. Scenario:
|
|
class A:
|
|
pass
|
|
A.__call__ = A() # that's right
|
|
a = A() # ok
|
|
a() # infinite recursion
|
|
This bounces between instance_call() and PyObject_Call() without
|
|
ever hitting eval_frame() (which has the main recursion check). */
|
|
if (Py_EnterRecursiveCall(" in __call__")) {
|
|
res = NULL;
|
|
}
|
|
else {
|
|
res = PyObject_Call(call, arg, kw);
|
|
Py_LeaveRecursiveCall();
|
|
}
|
|
Py_DECREF(call);
|
|
return res;
|
|
}
|
|
|
|
|
|
static PyNumberMethods instance_as_number = {
|
|
(binaryfunc)instance_add, /* nb_add */
|
|
(binaryfunc)instance_sub, /* nb_subtract */
|
|
(binaryfunc)instance_mul, /* nb_multiply */
|
|
(binaryfunc)instance_div, /* nb_divide */
|
|
(binaryfunc)instance_mod, /* nb_remainder */
|
|
(binaryfunc)instance_divmod, /* nb_divmod */
|
|
(ternaryfunc)instance_pow, /* nb_power */
|
|
(unaryfunc)instance_neg, /* nb_negative */
|
|
(unaryfunc)instance_pos, /* nb_positive */
|
|
(unaryfunc)instance_abs, /* nb_absolute */
|
|
(inquiry)instance_nonzero, /* nb_nonzero */
|
|
(unaryfunc)instance_invert, /* nb_invert */
|
|
(binaryfunc)instance_lshift, /* nb_lshift */
|
|
(binaryfunc)instance_rshift, /* nb_rshift */
|
|
(binaryfunc)instance_and, /* nb_and */
|
|
(binaryfunc)instance_xor, /* nb_xor */
|
|
(binaryfunc)instance_or, /* nb_or */
|
|
(coercion)instance_coerce, /* nb_coerce */
|
|
(unaryfunc)instance_int, /* nb_int */
|
|
(unaryfunc)instance_long, /* nb_long */
|
|
(unaryfunc)instance_float, /* nb_float */
|
|
(unaryfunc)instance_oct, /* nb_oct */
|
|
(unaryfunc)instance_hex, /* nb_hex */
|
|
(binaryfunc)instance_iadd, /* nb_inplace_add */
|
|
(binaryfunc)instance_isub, /* nb_inplace_subtract */
|
|
(binaryfunc)instance_imul, /* nb_inplace_multiply */
|
|
(binaryfunc)instance_idiv, /* nb_inplace_divide */
|
|
(binaryfunc)instance_imod, /* nb_inplace_remainder */
|
|
(ternaryfunc)instance_ipow, /* nb_inplace_power */
|
|
(binaryfunc)instance_ilshift, /* nb_inplace_lshift */
|
|
(binaryfunc)instance_irshift, /* nb_inplace_rshift */
|
|
(binaryfunc)instance_iand, /* nb_inplace_and */
|
|
(binaryfunc)instance_ixor, /* nb_inplace_xor */
|
|
(binaryfunc)instance_ior, /* nb_inplace_or */
|
|
(binaryfunc)instance_floordiv, /* nb_floor_divide */
|
|
(binaryfunc)instance_truediv, /* nb_true_divide */
|
|
(binaryfunc)instance_ifloordiv, /* nb_inplace_floor_divide */
|
|
(binaryfunc)instance_itruediv, /* nb_inplace_true_divide */
|
|
};
|
|
|
|
PyTypeObject PyInstance_Type = {
|
|
PyObject_HEAD_INIT(&PyType_Type)
|
|
0,
|
|
"instance",
|
|
sizeof(PyInstanceObject),
|
|
0,
|
|
(destructor)instance_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
instance_compare, /* tp_compare */
|
|
(reprfunc)instance_repr, /* tp_repr */
|
|
&instance_as_number, /* tp_as_number */
|
|
&instance_as_sequence, /* tp_as_sequence */
|
|
&instance_as_mapping, /* tp_as_mapping */
|
|
(hashfunc)instance_hash, /* tp_hash */
|
|
instance_call, /* tp_call */
|
|
(reprfunc)instance_str, /* tp_str */
|
|
(getattrofunc)instance_getattr, /* tp_getattro */
|
|
(setattrofunc)instance_setattr, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_CHECKTYPES,/*tp_flags*/
|
|
instance_doc, /* tp_doc */
|
|
(traverseproc)instance_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
instance_richcompare, /* tp_richcompare */
|
|
offsetof(PyInstanceObject, in_weakreflist), /* tp_weaklistoffset */
|
|
(getiterfunc)instance_getiter, /* tp_iter */
|
|
(iternextfunc)instance_iternext, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
0, /* tp_members */
|
|
0, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
0, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
0, /* tp_dictoffset */
|
|
0, /* tp_init */
|
|
0, /* tp_alloc */
|
|
instance_new, /* tp_new */
|
|
};
|
|
|
|
|
|
/* Instance method objects are used for two purposes:
|
|
(a) as bound instance methods (returned by instancename.methodname)
|
|
(b) as unbound methods (returned by ClassName.methodname)
|
|
In case (b), im_self is NULL
|
|
*/
|
|
|
|
static PyMethodObject *free_list;
|
|
|
|
PyObject *
|
|
PyMethod_New(PyObject *func, PyObject *self, PyObject *class)
|
|
{
|
|
register PyMethodObject *im;
|
|
if (!PyCallable_Check(func)) {
|
|
PyErr_BadInternalCall();
|
|
return NULL;
|
|
}
|
|
im = free_list;
|
|
if (im != NULL) {
|
|
free_list = (PyMethodObject *)(im->im_self);
|
|
PyObject_INIT(im, &PyMethod_Type);
|
|
}
|
|
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;
|
|
Py_XINCREF(class);
|
|
im->im_class = class;
|
|
_PyObject_GC_TRACK(im);
|
|
return (PyObject *)im;
|
|
}
|
|
|
|
/* Descriptors for PyMethod attributes */
|
|
|
|
/* im_class, im_func and im_self are stored in the PyMethod object */
|
|
|
|
#define OFF(x) offsetof(PyMethodObject, x)
|
|
|
|
static PyMemberDef instancemethod_memberlist[] = {
|
|
{"im_class", T_OBJECT, OFF(im_class), READONLY|RESTRICTED,
|
|
"the class associated with a method"},
|
|
{"im_func", T_OBJECT, OFF(im_func), READONLY|RESTRICTED,
|
|
"the function (or other callable) implementing a method"},
|
|
{"im_self", T_OBJECT, OFF(im_self), READONLY|RESTRICTED,
|
|
"the instance to which a method is bound; None for unbound methods"},
|
|
{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 *
|
|
instancemethod_get_doc(PyMethodObject *im, void *context)
|
|
{
|
|
static PyObject *docstr;
|
|
if (docstr == NULL) {
|
|
docstr= PyString_InternFromString("__doc__");
|
|
if (docstr == NULL)
|
|
return NULL;
|
|
}
|
|
return PyObject_GetAttr(im->im_func, docstr);
|
|
}
|
|
|
|
static PyGetSetDef instancemethod_getset[] = {
|
|
{"__doc__", (getter)instancemethod_get_doc, NULL, NULL},
|
|
{0}
|
|
};
|
|
|
|
static PyObject *
|
|
instancemethod_getattro(PyObject *obj, PyObject *name)
|
|
{
|
|
PyMethodObject *im = (PyMethodObject *)obj;
|
|
PyTypeObject *tp = obj->ob_type;
|
|
PyObject *descr = NULL;
|
|
|
|
if (PyType_HasFeature(tp, Py_TPFLAGS_HAVE_CLASS)) {
|
|
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(instancemethod_doc,
|
|
"instancemethod(function, instance, class)\n\
|
|
\n\
|
|
Create an instance method object.");
|
|
|
|
static PyObject *
|
|
instancemethod_new(PyTypeObject* type, PyObject* args, PyObject *kw)
|
|
{
|
|
PyObject *func;
|
|
PyObject *self;
|
|
PyObject *classObj = NULL;
|
|
|
|
if (!PyArg_UnpackTuple(args, "instancemethod", 2, 3,
|
|
&func, &self, &classObj))
|
|
return NULL;
|
|
if (!PyCallable_Check(func)) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"first argument must be callable");
|
|
return NULL;
|
|
}
|
|
if (self == Py_None)
|
|
self = NULL;
|
|
return PyMethod_New(func, self, classObj);
|
|
}
|
|
|
|
static void
|
|
instancemethod_dealloc(register 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);
|
|
Py_XDECREF(im->im_class);
|
|
im->im_self = (PyObject *)free_list;
|
|
free_list = im;
|
|
}
|
|
|
|
static int
|
|
instancemethod_compare(PyMethodObject *a, PyMethodObject *b)
|
|
{
|
|
if (a->im_self != b->im_self)
|
|
return (a->im_self < b->im_self) ? -1 : 1;
|
|
return PyObject_Compare(a->im_func, b->im_func);
|
|
}
|
|
|
|
static PyObject *
|
|
instancemethod_repr(PyMethodObject *a)
|
|
{
|
|
PyObject *self = a->im_self;
|
|
PyObject *func = a->im_func;
|
|
PyObject *klass = a->im_class;
|
|
PyObject *funcname = NULL, *klassname = NULL, *result = NULL;
|
|
char *sfuncname = "?", *sklassname = "?";
|
|
|
|
funcname = PyObject_GetAttrString(func, "__name__");
|
|
if (funcname == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
}
|
|
else if (!PyString_Check(funcname)) {
|
|
Py_DECREF(funcname);
|
|
funcname = NULL;
|
|
}
|
|
else
|
|
sfuncname = PyString_AS_STRING(funcname);
|
|
if (klass == NULL)
|
|
klassname = NULL;
|
|
else {
|
|
klassname = PyObject_GetAttrString(klass, "__name__");
|
|
if (klassname == NULL) {
|
|
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
|
|
return NULL;
|
|
PyErr_Clear();
|
|
}
|
|
else if (!PyString_Check(klassname)) {
|
|
Py_DECREF(klassname);
|
|
klassname = NULL;
|
|
}
|
|
else
|
|
sklassname = PyString_AS_STRING(klassname);
|
|
}
|
|
if (self == NULL)
|
|
result = PyString_FromFormat("<unbound method %s.%s>",
|
|
sklassname, sfuncname);
|
|
else {
|
|
/* XXX Shouldn't use repr() here! */
|
|
PyObject *selfrepr = PyObject_Repr(self);
|
|
if (selfrepr == NULL)
|
|
goto fail;
|
|
if (!PyString_Check(selfrepr)) {
|
|
Py_DECREF(selfrepr);
|
|
goto fail;
|
|
}
|
|
result = PyString_FromFormat("<bound method %s.%s of %s>",
|
|
sklassname, sfuncname,
|
|
PyString_AS_STRING(selfrepr));
|
|
Py_DECREF(selfrepr);
|
|
}
|
|
fail:
|
|
Py_XDECREF(funcname);
|
|
Py_XDECREF(klassname);
|
|
return result;
|
|
}
|
|
|
|
static long
|
|
instancemethod_hash(PyMethodObject *a)
|
|
{
|
|
long 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;
|
|
return x ^ y;
|
|
}
|
|
|
|
static int
|
|
instancemethod_traverse(PyMethodObject *im, visitproc visit, void *arg)
|
|
{
|
|
int err;
|
|
if (im->im_func) {
|
|
err = visit(im->im_func, arg);
|
|
if (err)
|
|
return err;
|
|
}
|
|
if (im->im_self) {
|
|
err = visit(im->im_self, arg);
|
|
if (err)
|
|
return err;
|
|
}
|
|
if (im->im_class) {
|
|
err = visit(im->im_class, arg);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
getclassname(PyObject *class, char *buf, int bufsize)
|
|
{
|
|
PyObject *name;
|
|
|
|
assert(bufsize > 1);
|
|
strcpy(buf, "?"); /* Default outcome */
|
|
if (class == NULL)
|
|
return;
|
|
name = PyObject_GetAttrString(class, "__name__");
|
|
if (name == NULL) {
|
|
/* This function cannot return an exception */
|
|
PyErr_Clear();
|
|
return;
|
|
}
|
|
if (PyString_Check(name)) {
|
|
strncpy(buf, PyString_AS_STRING(name), bufsize);
|
|
buf[bufsize-1] = '\0';
|
|
}
|
|
Py_DECREF(name);
|
|
}
|
|
|
|
static void
|
|
getinstclassname(PyObject *inst, char *buf, int bufsize)
|
|
{
|
|
PyObject *class;
|
|
|
|
if (inst == NULL) {
|
|
assert(bufsize > 0 && (size_t)bufsize > strlen("nothing"));
|
|
strcpy(buf, "nothing");
|
|
return;
|
|
}
|
|
|
|
class = PyObject_GetAttrString(inst, "__class__");
|
|
if (class == NULL) {
|
|
/* This function cannot return an exception */
|
|
PyErr_Clear();
|
|
class = (PyObject *)(inst->ob_type);
|
|
Py_INCREF(class);
|
|
}
|
|
getclassname(class, buf, bufsize);
|
|
Py_XDECREF(class);
|
|
}
|
|
|
|
static PyObject *
|
|
instancemethod_call(PyObject *func, PyObject *arg, PyObject *kw)
|
|
{
|
|
PyObject *self = PyMethod_GET_SELF(func);
|
|
PyObject *class = PyMethod_GET_CLASS(func);
|
|
PyObject *result;
|
|
|
|
func = PyMethod_GET_FUNCTION(func);
|
|
if (self == NULL) {
|
|
/* Unbound methods must be called with an instance of
|
|
the class (or a derived class) as first argument */
|
|
int ok;
|
|
if (PyTuple_Size(arg) >= 1)
|
|
self = PyTuple_GET_ITEM(arg, 0);
|
|
if (self == NULL)
|
|
ok = 0;
|
|
else {
|
|
ok = PyObject_IsInstance(self, class);
|
|
if (ok < 0)
|
|
return NULL;
|
|
}
|
|
if (!ok) {
|
|
char clsbuf[256];
|
|
char instbuf[256];
|
|
getclassname(class, clsbuf, sizeof(clsbuf));
|
|
getinstclassname(self, instbuf, sizeof(instbuf));
|
|
PyErr_Format(PyExc_TypeError,
|
|
"unbound method %s%s must be called with "
|
|
"%s instance as first argument "
|
|
"(got %s%s instead)",
|
|
PyEval_GetFuncName(func),
|
|
PyEval_GetFuncDesc(func),
|
|
clsbuf,
|
|
instbuf,
|
|
self == NULL ? "" : " instance");
|
|
return NULL;
|
|
}
|
|
Py_INCREF(arg);
|
|
}
|
|
else {
|
|
int argcount = PyTuple_Size(arg);
|
|
PyObject *newarg = PyTuple_New(argcount + 1);
|
|
int i;
|
|
if (newarg == NULL)
|
|
return NULL;
|
|
Py_INCREF(self);
|
|
PyTuple_SET_ITEM(newarg, 0, self);
|
|
for (i = 0; i < argcount; i++) {
|
|
PyObject *v = PyTuple_GET_ITEM(arg, i);
|
|
Py_XINCREF(v);
|
|
PyTuple_SET_ITEM(newarg, i+1, v);
|
|
}
|
|
arg = newarg;
|
|
}
|
|
result = PyObject_Call((PyObject *)func, arg, kw);
|
|
Py_DECREF(arg);
|
|
return result;
|
|
}
|
|
|
|
static PyObject *
|
|
instancemethod_descr_get(PyObject *meth, PyObject *obj, PyObject *cls)
|
|
{
|
|
/* Don't rebind an already bound method, or an unbound 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;
|
|
}
|
|
/* No, it is an unbound method */
|
|
if (PyMethod_GET_CLASS(meth) != NULL && cls != NULL) {
|
|
/* Do subclass test. If it fails, return meth unchanged. */
|
|
int ok = PyObject_IsSubclass(cls, PyMethod_GET_CLASS(meth));
|
|
if (ok < 0)
|
|
return NULL;
|
|
if (!ok) {
|
|
Py_INCREF(meth);
|
|
return meth;
|
|
}
|
|
}
|
|
/* Bind it to obj */
|
|
return PyMethod_New(PyMethod_GET_FUNCTION(meth), obj, cls);
|
|
}
|
|
|
|
PyTypeObject PyMethod_Type = {
|
|
PyObject_HEAD_INIT(&PyType_Type)
|
|
0,
|
|
"instancemethod",
|
|
sizeof(PyMethodObject),
|
|
0,
|
|
(destructor)instancemethod_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
(cmpfunc)instancemethod_compare, /* tp_compare */
|
|
(reprfunc)instancemethod_repr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
(hashfunc)instancemethod_hash, /* tp_hash */
|
|
instancemethod_call, /* tp_call */
|
|
0, /* tp_str */
|
|
(getattrofunc)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 */
|
|
(traverseproc)instancemethod_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
offsetof(PyMethodObject, im_weakreflist), /* 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 */
|
|
};
|
|
|
|
/* Clear out the free list */
|
|
|
|
void
|
|
PyMethod_Fini(void)
|
|
{
|
|
while (free_list) {
|
|
PyMethodObject *im = free_list;
|
|
free_list = (PyMethodObject *)(im->im_self);
|
|
PyObject_GC_Del(im);
|
|
}
|
|
}
|