/* Class object implementation */ #include "Python.h" #include "structmember.h" /* Forward */ static PyObject *class_lookup(PyClassObject *, PyObject *, PyClassObject **); static PyObject *instance_getattr1(PyInstanceObject *, PyObject *); static PyObject *instance_getattr2(PyInstanceObject *, PyObject *); static PyObject *getattrstr, *setattrstr, *delattrstr; PyObject * PyClass_New(PyObject *bases, PyObject *dict, PyObject *name) /* bases is NULL or tuple of classobjects! */ { PyClassObject *op, *dummy; static PyObject *docstr, *modstr, *namestr; if (docstr == NULL) { docstr= PyString_InternFromString("__doc__"); if (docstr == NULL) return NULL; } if (modstr == NULL) { modstr= PyString_InternFromString("__module__"); if (modstr == NULL) return NULL; } if (namestr == NULL) { namestr= PyString_InternFromString("__name__"); if (namestr == NULL) return NULL; } if (name == NULL || !PyString_Check(name)) { PyErr_SetString(PyExc_TypeError, "PyClass_New: name must be a string"); return NULL; } if (dict == NULL || !PyDict_Check(dict)) { PyErr_SetString(PyExc_TypeError, "PyClass_New: dict must be a dictionary"); return NULL; } if (PyDict_GetItem(dict, docstr) == NULL) { if (PyDict_SetItem(dict, docstr, Py_None) < 0) return NULL; } if (PyDict_GetItem(dict, modstr) == NULL) { PyObject *globals = PyEval_GetGlobals(); if (globals != NULL) { PyObject *modname = PyDict_GetItem(globals, namestr); if (modname != NULL) { if (PyDict_SetItem(dict, modstr, modname) < 0) return NULL; } } } if (bases == NULL) { bases = PyTuple_New(0); if (bases == NULL) return NULL; } else { int i; if (!PyTuple_Check(bases)) { PyErr_SetString(PyExc_TypeError, "PyClass_New: bases must be a tuple"); return NULL; } i = PyTuple_Size(bases); while (--i >= 0) { if (!PyClass_Check(PyTuple_GetItem(bases, i))) { PyErr_SetString(PyExc_TypeError, "PyClass_New: base must be a class"); return NULL; } } Py_INCREF(bases); } op = PyObject_NEW(PyClassObject, &PyClass_Type); if (op == NULL) { Py_DECREF(bases); return NULL; } op->cl_bases = bases; Py_INCREF(dict); op->cl_dict = dict; Py_XINCREF(name); op->cl_name = name; if (getattrstr == NULL) { getattrstr = PyString_InternFromString("__getattr__"); setattrstr = PyString_InternFromString("__setattr__"); delattrstr = PyString_InternFromString("__delattr__"); } op->cl_getattr = class_lookup(op, getattrstr, &dummy); op->cl_setattr = class_lookup(op, setattrstr, &dummy); op->cl_delattr = class_lookup(op, delattrstr, &dummy); Py_XINCREF(op->cl_getattr); Py_XINCREF(op->cl_setattr); Py_XINCREF(op->cl_delattr); PyObject_GC_Init(op); return (PyObject *) op; } static PyObject * class_new(PyTypeObject *type, PyObject *args, PyObject *kwds) { PyObject *name, *bases, *dict; static char *kwlist[] = {"name", "bases", "dict", 0}; if (!PyArg_ParseTupleAndKeywords(args, kwds, "SOO", kwlist, &name, &bases, &dict)) return NULL; return PyClass_New(bases, dict, name); } /* Class methods */ static void class_dealloc(PyClassObject *op) { PyObject_GC_Fini(op); Py_DECREF(op->cl_bases); Py_DECREF(op->cl_dict); Py_XDECREF(op->cl_name); Py_XDECREF(op->cl_getattr); Py_XDECREF(op->cl_setattr); Py_XDECREF(op->cl_delattr); op = (PyClassObject *) PyObject_AS_GC(op); PyObject_DEL(op); } static PyObject * class_lookup(PyClassObject *cp, PyObject *name, PyClassObject **pclass) { int i, n; PyObject *value = PyDict_GetItem(cp->cl_dict, name); if (value != NULL) { *pclass = cp; return value; } n = PyTuple_Size(cp->cl_bases); for (i = 0; i < n; i++) { /* XXX What if one of the bases is not a class? */ PyObject *v = class_lookup( (PyClassObject *) PyTuple_GetItem(cp->cl_bases, i), name, pclass); if (v != NULL) return v; } return NULL; } static PyObject * class_getattr(register PyClassObject *op, PyObject *name) { register PyObject *v; register char *sname = PyString_AsString(name); PyClassObject *class; descrgetfunc f; if (sname[0] == '_' && sname[1] == '_') { if (strcmp(sname, "__dict__") == 0) { if (PyEval_GetRestricted()) { PyErr_SetString(PyExc_RuntimeError, "class.__dict__ not accessible in restricted mode"); return NULL; } Py_INCREF(op->cl_dict); return op->cl_dict; } if (strcmp(sname, "__bases__") == 0) { Py_INCREF(op->cl_bases); return op->cl_bases; } if (strcmp(sname, "__name__") == 0) { if (op->cl_name == NULL) v = Py_None; else v = op->cl_name; Py_INCREF(v); return v; } } v = class_lookup(op, name, &class); if (v == NULL) { PyErr_Format(PyExc_AttributeError, "class %.50s has no attribute '%.400s'", PyString_AS_STRING(op->cl_name), sname); return NULL; } f = v->ob_type->tp_descr_get; if (f == NULL) Py_INCREF(v); else v = f(v, (PyObject *)NULL, (PyObject *)op); return v; } static void set_slot(PyObject **slot, PyObject *v) { PyObject *temp = *slot; Py_XINCREF(v); *slot = v; Py_XDECREF(temp); } static void set_attr_slots(PyClassObject *c) { PyClassObject *dummy; set_slot(&c->cl_getattr, class_lookup(c, getattrstr, &dummy)); set_slot(&c->cl_setattr, class_lookup(c, setattrstr, &dummy)); set_slot(&c->cl_delattr, class_lookup(c, delattrstr, &dummy)); } static char * set_dict(PyClassObject *c, PyObject *v) { if (v == NULL || !PyDict_Check(v)) return "__dict__ must be a dictionary object"; set_slot(&c->cl_dict, v); set_attr_slots(c); return ""; } static char * set_bases(PyClassObject *c, PyObject *v) { int i, n; if (v == NULL || !PyTuple_Check(v)) return "__bases__ must be a tuple object"; n = PyTuple_Size(v); for (i = 0; i < n; i++) { PyObject *x = PyTuple_GET_ITEM(v, i); if (!PyClass_Check(x)) return "__bases__ items must be classes"; if (PyClass_IsSubclass(x, (PyObject *)c)) return "a __bases__ item causes an inheritance cycle"; } set_slot(&c->cl_bases, v); set_attr_slots(c); return ""; } static char * set_name(PyClassObject *c, PyObject *v) { if (v == NULL || !PyString_Check(v)) return "__name__ must be a string object"; if (strlen(PyString_AS_STRING(v)) != (size_t)PyString_GET_SIZE(v)) return "__name__ must not contain null bytes"; set_slot(&c->cl_name, v); return ""; } static int class_setattr(PyClassObject *op, PyObject *name, PyObject *v) { char *sname; if (PyEval_GetRestricted()) { PyErr_SetString(PyExc_RuntimeError, "classes are read-only in restricted mode"); return -1; } sname = PyString_AsString(name); if (sname[0] == '_' && sname[1] == '_') { int n = PyString_Size(name); if (sname[n-1] == '_' && sname[n-2] == '_') { char *err = NULL; if (strcmp(sname, "__dict__") == 0) err = set_dict(op, v); else if (strcmp(sname, "__bases__") == 0) err = set_bases(op, v); else if (strcmp(sname, "__name__") == 0) err = set_name(op, v); else if (strcmp(sname, "__getattr__") == 0) set_slot(&op->cl_getattr, v); else if (strcmp(sname, "__setattr__") == 0) set_slot(&op->cl_setattr, v); else if (strcmp(sname, "__delattr__") == 0) set_slot(&op->cl_delattr, v); /* For the last three, we fall through to update the dictionary as well. */ if (err != NULL) { if (*err == '\0') return 0; PyErr_SetString(PyExc_TypeError, err); return -1; } } } if (v == NULL) { int rv = PyDict_DelItem(op->cl_dict, name); if (rv < 0) PyErr_Format(PyExc_AttributeError, "class %.50s has no attribute '%.400s'", PyString_AS_STRING(op->cl_name), sname); return rv; } else return PyDict_SetItem(op->cl_dict, name, v); } static PyObject * class_repr(PyClassObject *op) { PyObject *mod = PyDict_GetItemString(op->cl_dict, "__module__"); char buf[140]; char *name; if (op->cl_name == NULL || !PyString_Check(op->cl_name)) name = "?"; else name = PyString_AsString(op->cl_name); if (mod == NULL || !PyString_Check(mod)) sprintf(buf, "", name, op); else sprintf(buf, "", PyString_AsString(mod), name, op); return PyString_FromString(buf); } static PyObject * class_str(PyClassObject *op) { PyObject *mod = PyDict_GetItemString(op->cl_dict, "__module__"); PyObject *name = op->cl_name; PyObject *res; int m, n; if (name == NULL || !PyString_Check(name)) return class_repr(op); if (mod == NULL || !PyString_Check(mod)) { Py_INCREF(name); return name; } m = PyString_Size(mod); n = PyString_Size(name); res = PyString_FromStringAndSize((char *)NULL, m+1+n); if (res != NULL) { char *s = PyString_AsString(res); memcpy(s, PyString_AsString(mod), m); s += m; *s++ = '.'; memcpy(s, PyString_AsString(name), n); } return res; } static int class_traverse(PyClassObject *o, visitproc visit, void *arg) { int err; if (o->cl_bases) { err = visit(o->cl_bases, arg); if (err) return err; } if (o->cl_dict) { err = visit(o->cl_dict, arg); if (err) return err; } if (o->cl_name) { err = visit(o->cl_name, arg); if (err) return err; } if (o->cl_getattr) { err = visit(o->cl_getattr, arg); if (err) return err; } if (o->cl_setattr) { 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, "class", sizeof(PyClassObject) + PyGC_HEAD_SIZE, 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_GC, /* tp_flags */ 0, /* 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 (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_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_Init(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 ((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 */ static void instance_dealloc(register PyInstanceObject *inst) { PyObject *error_type, *error_value, *error_traceback; PyObject *del; static PyObject *delstr; #ifdef Py_REF_DEBUG extern long _Py_RefTotal; #endif PyObject_ClearWeakRefs((PyObject *) inst); /* Temporarily resurrect the object. */ #ifdef Py_TRACE_REFS #ifndef Py_REF_DEBUG # error "Py_TRACE_REFS defined but Py_REF_DEBUG not." #endif /* much too complicated if Py_TRACE_REFS defined */ inst->ob_type = &PyInstance_Type; _Py_NewReference((PyObject *)inst); #ifdef COUNT_ALLOCS /* compensate for boost in _Py_NewReference; note that * _Py_RefTotal was also boosted; we'll knock that down later. */ inst->ob_type->tp_allocs--; #endif #else /* !Py_TRACE_REFS */ /* Py_INCREF boosts _Py_RefTotal if Py_REF_DEBUG is defined */ Py_INCREF(inst); #endif /* !Py_TRACE_REFS */ /* 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. */ #ifdef Py_REF_DEBUG /* _Py_RefTotal was boosted either by _Py_NewReference or * Py_INCREF above. */ _Py_RefTotal--; #endif if (--inst->ob_refcnt > 0) { #ifdef COUNT_ALLOCS inst->ob_type->tp_frees--; #endif return; /* __del__ added a reference; don't delete now */ } #ifdef Py_TRACE_REFS _Py_ForgetReference((PyObject *)inst); #ifdef COUNT_ALLOCS /* compensate for increment in _Py_ForgetReference */ inst->ob_type->tp_frees--; #endif #ifndef WITH_CYCLE_GC inst->ob_type = NULL; #endif #endif PyObject_GC_Fini(inst); Py_DECREF(inst->in_class); Py_XDECREF(inst->in_dict); inst = (PyInstanceObject *) PyObject_AS_GC(inst); PyObject_DEL(inst); } 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_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; class = NULL; v = PyDict_GetItem(inst->in_dict, name); if (v == NULL) { v = class_lookup(inst->in_class, name, &class); if (v == NULL) return v; } Py_INCREF(v); if (class != NULL) { f = v->ob_type->tp_descr_get; if (f != NULL) { PyObject *w = f(v, (PyObject *)inst, (PyObject *)(inst->in_class)); Py_DECREF(v); v = w; } else if (PyMethod_Check(v)) { /* XXX This should be a tp_descr_get slot of PyMethodObjects */ PyObject *im_class = PyMethod_GET_CLASS(v); /* Only if classes are compatible */ if (PyClass_IsSubclass((PyObject *)class, im_class)) { PyObject *im_func = PyMethod_GET_FUNCTION(v); PyObject *w = PyMethod_New(im_func, (PyObject *)inst, im_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; PyErr_Clear(); args = Py_BuildValue("(OO)", inst, name); if (args == NULL) return NULL; res = PyEval_CallObject(func, args); Py_DECREF(args); } return res; } 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 = Py_BuildValue("(OO)", inst, name); else args = Py_BuildValue("(OOO)", 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) { char buf[140]; PyObject *classname = inst->in_class->cl_name; PyObject *mod = PyDict_GetItemString( inst->in_class->cl_dict, "__module__"); char *cname; if (classname != NULL && PyString_Check(classname)) cname = PyString_AsString(classname); else cname = "?"; PyErr_Clear(); if (mod == NULL || !PyString_Check(mod)) sprintf(buf, "", cname, inst); else sprintf(buf, "<%.50s.%.50s instance at %p>", PyString_AsString(mod), cname, inst); return PyString_FromString(buf); } 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) { 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 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__. */ PyErr_Clear(); if (eqstr == NULL) eqstr = PyString_InternFromString("__eq__"); func = instance_getattr(inst, eqstr); if (func == NULL) { PyErr_Clear(); if (cmpstr == NULL) cmpstr = PyString_InternFromString("__cmp__"); func = instance_getattr(inst, cmpstr); if (func == NULL) { PyErr_Clear(); return _Py_HashPointer(inst); } } 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 = Py_BuildValue("(O)", 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 = Py_BuildValue("(O)", key); else arg = Py_BuildValue("(OO)", 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) { 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) { 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) { 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 = Py_BuildValue("(O)", 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_IterContains((PyObject *)inst, member); } 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 = Py_BuildValue("(O)", 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) { PyErr_Clear(); return generic_binary_op(v, w, opname); } args = Py_BuildValue("(O)", w); if (args == NULL) { 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 */ PyErr_Clear(); return 1; } /* Has __coerce__ method: call it */ args = Py_BuildValue("(O)", 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_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) /* 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) { PyErr_Clear(); return 2; } args = Py_BuildValue("(O)", w); if (args == NULL) 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) { PyErr_Clear(); if (lenstr == NULL) lenstr = PyString_InternFromString("__len__"); if ((func = instance_getattr(self, lenstr)) == NULL) { 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 = Py_BuildValue("(OO)", 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 = Py_BuildValue("(OO)", 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]); if (method == NULL) { assert(!PyErr_Occurred()); res = Py_NotImplemented; Py_INCREF(res); return res; } } else { method = PyObject_GetAttr(v, name_op[op]); if (method == NULL) { if (!PyErr_ExceptionMatches(PyExc_AttributeError)) return NULL; PyErr_Clear(); res = Py_NotImplemented; Py_INCREF(res); return res; } } args = Py_BuildValue("(O)", 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 (getitemstr == NULL) getitemstr = PyString_InternFromString("__getitem__"); 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; } PyErr_Clear(); if ((func = instance_getattr(self, getitemstr)) == NULL) { PyErr_SetString(PyExc_TypeError, "iter() of 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; PyErr_Clear(); PyErr_Format(PyExc_AttributeError, "%.200s instance has no __call__ method", PyString_AsString(inst->in_class->cl_name)); return NULL; } res = PyObject_Call(call, arg, kw); 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 */ }; PyTypeObject PyInstance_Type = { PyObject_HEAD_INIT(&PyType_Type) 0, "instance", sizeof(PyInstanceObject) + PyGC_HEAD_SIZE, 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_GC | Py_TPFLAGS_CHECKTYPES,/*tp_flags*/ 0, /* 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 */ }; /* 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_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_INCREF(class); im->im_class = class; PyObject_GC_Init(im); return (PyObject *)im; } /* Class method methods */ #define OFF(x) offsetof(PyMethodObject, x) static struct memberlist instancemethod_memberlist[] = { {"im_func", T_OBJECT, OFF(im_func)}, {"im_self", T_OBJECT, OFF(im_self)}, {"im_class", T_OBJECT, OFF(im_class)}, /* Dummies that are not handled by getattr() except for __members__ */ {"__doc__", T_INT, 0}, {"__name__", T_INT, 0}, {"__dict__", T_OBJECT, 0}, {NULL} /* Sentinel */ }; static int instancemethod_setattro(register PyMethodObject *im, PyObject *name, PyObject *v) { char *sname = PyString_AsString(name); PyErr_Format(PyExc_TypeError, "read-only attribute: %s", sname); return -1; } static PyObject * instancemethod_getattro(register PyMethodObject *im, PyObject *name) { PyObject *rtn; char *sname = PyString_AsString(name); if (sname[0] == '_') { /* Inherit __name__ and __doc__ from the callable object implementing the method */ if (strcmp(sname, "__name__") == 0 || strcmp(sname, "__doc__") == 0) return PyObject_GetAttr(im->im_func, name); } if (PyEval_GetRestricted()) { PyErr_SetString(PyExc_RuntimeError, "instance-method attributes not accessible in restricted mode"); return NULL; } if (sname[0] == '_' && strcmp(sname, "__dict__") == 0) return PyObject_GetAttr(im->im_func, name); rtn = PyMember_Get((char *)im, instancemethod_memberlist, sname); if (rtn == NULL && PyErr_ExceptionMatches(PyExc_AttributeError)) { PyErr_Clear(); rtn = PyObject_GetAttr(im->im_func, name); } return rtn; } static void instancemethod_dealloc(register PyMethodObject *im) { PyObject_ClearWeakRefs((PyObject *)im); PyObject_GC_Fini(im); Py_DECREF(im->im_func); Py_XDECREF(im->im_self); Py_DECREF(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) { char buffer[240]; 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) PyErr_Clear(); else if (!PyString_Check(funcname)) { Py_DECREF(funcname); funcname = NULL; } else sfuncname = PyString_AS_STRING(funcname); klassname = PyObject_GetAttrString(klass, "__name__"); if (klassname == NULL) PyErr_Clear(); else if (!PyString_Check(klassname)) { Py_DECREF(klassname); klassname = NULL; } else sklassname = PyString_AS_STRING(klassname); if (self == NULL) sprintf(buffer, "", 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; } sprintf(buffer, "", sklassname, sfuncname, PyString_AS_STRING(selfrepr)); Py_DECREF(selfrepr); } result = PyString_FromString(buffer); 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 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) { PyErr_Format(PyExc_TypeError, "unbound method %s%s must be " "called with instance as first argument", PyEval_GetFuncName(func), PyEval_GetFuncDesc(func)); 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; } PyTypeObject PyMethod_Type = { PyObject_HEAD_INIT(&PyType_Type) 0, "instance method", sizeof(PyMethodObject) + PyGC_HEAD_SIZE, 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 */ (setattrofunc)instancemethod_setattro, /* tp_setattro */ 0, /* tp_as_buffer */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */ 0, /* tp_doc */ (traverseproc)instancemethod_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ offsetof(PyMethodObject, im_weakreflist) /* tp_weaklistoffset */ }; /* Clear out the free list */ void PyMethod_Fini(void) { while (free_list) { PyMethodObject *im = free_list; free_list = (PyMethodObject *)(im->im_self); im = (PyMethodObject *) PyObject_AS_GC(im); PyObject_DEL(im); } }