| |
| /* Class object implementation */ |
| |
| #include "Python.h" |
| #include "structmember.h" |
| |
| #define TP_DESCR_GET(t) \ |
| (PyType_HasFeature(t, Py_TPFLAGS_HAVE_CLASS) ? (t)->tp_descr_get : NULL) |
| |
| |
| /* 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 { |
| Py_ssize_t i, n; |
| PyObject *base; |
| if (!PyTuple_Check(bases)) { |
| PyErr_SetString(PyExc_TypeError, |
| "PyClass_New: bases must be a tuple"); |
| return NULL; |
| } |
| n = PyTuple_Size(bases); |
| for (i = 0; i < n; i++) { |
| base = PyTuple_GET_ITEM(bases, i); |
| if (!PyClass_Check(base)) { |
| if (PyCallable_Check( |
| (PyObject *) base->ob_type)) |
| return PyObject_CallFunction( |
| (PyObject *) base->ob_type, |
| "OOO", |
| name, |
| bases, |
| dict); |
| PyErr_SetString(PyExc_TypeError, |
| "PyClass_New: base must be a class"); |
| return NULL; |
| } |
| } |
| Py_INCREF(bases); |
| } |
| op = PyObject_GC_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_TRACK(op); |
| return (PyObject *) op; |
| } |
| |
| PyObject * |
| PyMethod_Function(PyObject *im) |
| { |
| if (!PyMethod_Check(im)) { |
| PyErr_BadInternalCall(); |
| return NULL; |
| } |
| return ((PyMethodObject *)im)->im_func; |
| } |
| |
| PyObject * |
| PyMethod_Self(PyObject *im) |
| { |
| if (!PyMethod_Check(im)) { |
| PyErr_BadInternalCall(); |
| return NULL; |
| } |
| return ((PyMethodObject *)im)->im_self; |
| } |
| |
| PyObject * |
| PyMethod_Class(PyObject *im) |
| { |
| if (!PyMethod_Check(im)) { |
| PyErr_BadInternalCall(); |
| return NULL; |
| } |
| return ((PyMethodObject *)im)->im_class; |
| } |
| |
| PyDoc_STRVAR(class_doc, |
| "classobj(name, bases, dict)\n\ |
| \n\ |
| Create a class object. The name must be a string; the second argument\n\ |
| a tuple of classes, and the third a dictionary."); |
| |
| 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_UNTRACK(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); |
| PyObject_GC_Del(op); |
| } |
| |
| static PyObject * |
| class_lookup(PyClassObject *cp, PyObject *name, PyClassObject **pclass) |
| { |
| Py_ssize_t 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 *klass; |
| 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, &klass); |
| if (v == NULL) { |
| PyErr_Format(PyExc_AttributeError, |
| "class %.50s has no attribute '%.400s'", |
| PyString_AS_STRING(op->cl_name), sname); |
| return NULL; |
| } |
| f = TP_DESCR_GET(v->ob_type); |
| 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) |
| { |
| Py_ssize_t 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 *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)) |
| return PyString_FromFormat("<class ?.%s at %p>", name, op); |
| else |
| return PyString_FromFormat("<class %s.%s at %p>", |
| PyString_AsString(mod), |
| name, op); |
| } |
| |
| 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_GET_SIZE(mod); |
| n = PyString_GET_SIZE(name); |
| res = PyString_FromStringAndSize((char *)NULL, m+1+n); |
| if (res != NULL) { |
| char *s = PyString_AS_STRING(res); |
| memcpy(s, PyString_AS_STRING(mod), m); |
| s += m; |
| *s++ = '.'; |
| memcpy(s, PyString_AS_STRING(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, |
| "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 *klass, PyObject *base) |
| { |
| Py_ssize_t i, n; |
| PyClassObject *cp; |
| if (klass == base) |
| return 1; |
| if (PyTuple_Check(base)) { |
| n = PyTuple_GET_SIZE(base); |
| for (i = 0; i < n; i++) { |
| if (PyClass_IsSubclass(klass, PyTuple_GET_ITEM(base, i))) |
| return 1; |
| } |
| return 0; |
| } |
| if (klass == NULL || !PyClass_Check(klass)) |
| return 0; |
| cp = (PyClassObject *)klass; |
| 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, _Py_NewReference bumped _Py_RefTotal, so |
| * we need to undo that. */ |
| _Py_DEC_REFTOTAL; |
| /* If Py_TRACE_REFS, _Py_NewReference re-added self to the |
| * object chain, so no more to do there. |
| * 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 *klass; |
| descrgetfunc f; |
| |
| v = PyDict_GetItem(inst->in_dict, name); |
| if (v != NULL) { |
| Py_INCREF(v); |
| return v; |
| } |
| v = class_lookup(inst->in_class, name, &klass); |
| 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 *klass; |
| 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, &klass); |
| 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 Py_ssize_t |
| instance_length(PyInstanceObject *inst) |
| { |
| PyObject *func; |
| PyObject *res; |
| Py_ssize_t 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)) { |
| Py_ssize_t temp = PyInt_AsSsize_t(res); |
| if (temp == -1 && PyErr_Occurred()) { |
| Py_DECREF(res); |
| return -1; |
| } |
| outcome = (Py_ssize_t)temp; |
| #if SIZEOF_SIZE_T < SIZEOF_LONG |
| /* Overflow check -- range of PyInt is more than C int */ |
| if (outcome != temp) { |
| PyErr_SetString(PyExc_OverflowError, |
| "__len__() should return 0 <= outcome < 2**31"); |
| outcome = -1; |
| } |
| else |
| #endif |
| 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 = { |
| (lenfunc)instance_length, /* mp_length */ |
| (binaryfunc)instance_subscript, /* mp_subscript */ |
| (objobjargproc)instance_ass_subscript, /* mp_ass_subscript */ |
| }; |
| |
| static PyObject * |
| instance_item(PyInstanceObject *inst, Py_ssize_t 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("(n)", i); |
| if (arg == NULL) { |
| Py_DECREF(func); |
| return NULL; |
| } |
| res = PyEval_CallObject(func, arg); |
| Py_DECREF(func); |
| Py_DECREF(arg); |
| return res; |
| } |
| |
| static PyObject * |
| instance_slice(PyInstanceObject *inst, Py_ssize_t i, Py_ssize_t 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)", _PySlice_FromIndices(i, j)); |
| } else |
| arg = Py_BuildValue("(nn)", 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, Py_ssize_t 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, Py_ssize_t i, Py_ssize_t 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)", |
| _PySlice_FromIndices(i, j)); |
| } else |
| arg = Py_BuildValue("(nn)", 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)", |
| _PySlice_FromIndices(i, j), value); |
| } else |
| arg = Py_BuildValue("(nnO)", 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 = { |
| (lenfunc)instance_length, /* sq_length */ |
| 0, /* sq_concat */ |
| 0, /* sq_repeat */ |
| (ssizeargfunc)instance_item, /* sq_item */ |
| (ssizessizeargfunc)instance_slice, /* sq_slice */ |
| (ssizeobjargproc)instance_ass_item, /* sq_ass_item */ |
| (ssizessizeobjargproc)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; |
| } |
| |
| static Py_ssize_t |
| instance_index(PyInstanceObject *self) |
| { |
| PyObject *func, *res; |
| Py_ssize_t outcome; |
| static PyObject *indexstr = NULL; |
| |
| if (indexstr == NULL) { |
| indexstr = PyString_InternFromString("__index__"); |
| if (indexstr == NULL) |
| return -1; |
| } |
| if ((func = instance_getattr(self, indexstr)) == NULL) { |
| if (!PyErr_ExceptionMatches(PyExc_AttributeError)) |
| return -1; |
| PyErr_Clear(); |
| PyErr_SetString(PyExc_TypeError, |
| "object cannot be interpreted as an index"); |
| return -1; |
| } |
| res = PyEval_CallObject(func, (PyObject *)NULL); |
| Py_DECREF(func); |
| if (res == NULL) |
| return -1; |
| if (PyInt_Check(res) || PyLong_Check(res)) { |
| outcome = res->ob_type->tp_as_number->nb_index(res); |
| } |
| else { |
| PyErr_SetString(PyExc_TypeError, |
| "__index__ must return an int or a long"); |
| outcome = -1; |
| } |
| Py_DECREF(res); |
| return outcome; |
| } |
| |
| |
| 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; |
| } |
| |
| 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, _Py_SwappedOp[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 = { |
| instance_add, /* nb_add */ |
| instance_sub, /* nb_subtract */ |
| instance_mul, /* nb_multiply */ |
| instance_div, /* nb_divide */ |
| instance_mod, /* nb_remainder */ |
| instance_divmod, /* nb_divmod */ |
| 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 */ |
| instance_lshift, /* nb_lshift */ |
| instance_rshift, /* nb_rshift */ |
| instance_and, /* nb_and */ |
| instance_xor, /* nb_xor */ |
| instance_or, /* nb_or */ |
| 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 */ |
| instance_iadd, /* nb_inplace_add */ |
| instance_isub, /* nb_inplace_subtract */ |
| instance_imul, /* nb_inplace_multiply */ |
| instance_idiv, /* nb_inplace_divide */ |
| instance_imod, /* nb_inplace_remainder */ |
| instance_ipow, /* nb_inplace_power */ |
| instance_ilshift, /* nb_inplace_lshift */ |
| instance_irshift, /* nb_inplace_rshift */ |
| instance_iand, /* nb_inplace_and */ |
| instance_ixor, /* nb_inplace_xor */ |
| instance_ior, /* nb_inplace_or */ |
| instance_floordiv, /* nb_floor_divide */ |
| instance_truediv, /* nb_true_divide */ |
| instance_ifloordiv, /* nb_inplace_floor_divide */ |
| instance_itruediv, /* nb_inplace_true_divide */ |
| (lenfunc)instance_index, /* nb_index */ |
| }; |
| |
| 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 *klass) |
| { |
| 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(klass); |
| im->im_class = klass; |
| _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; |
| if (self == NULL && classObj == NULL) { |
| PyErr_SetString(PyExc_TypeError, |
| "unbound methods must have non-NULL im_class"); |
| return 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 *klass, char *buf, int bufsize) |
| { |
| PyObject *name; |
| |
| assert(bufsize > 1); |
| strcpy(buf, "?"); /* Default outcome */ |
| if (klass == NULL) |
| return; |
| name = PyObject_GetAttrString(klass, "__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 *klass; |
| |
| if (inst == NULL) { |
| assert(bufsize > 0 && (size_t)bufsize > strlen("nothing")); |
| strcpy(buf, "nothing"); |
| return; |
| } |
| |
| klass = PyObject_GetAttrString(inst, "__class__"); |
| if (klass == NULL) { |
| /* This function cannot return an exception */ |
| PyErr_Clear(); |
| klass = (PyObject *)(inst->ob_type); |
| Py_INCREF(klass); |
| } |
| getclassname(klass, buf, bufsize); |
| Py_XDECREF(klass); |
| } |
| |
| static PyObject * |
| instancemethod_call(PyObject *func, PyObject *arg, PyObject *kw) |
| { |
| PyObject *self = PyMethod_GET_SELF(func); |
| PyObject *klass = 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, klass); |
| if (ok < 0) |
| return NULL; |
| } |
| if (!ok) { |
| char clsbuf[256]; |
| char instbuf[256]; |
| getclassname(klass, 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 { |
| Py_ssize_t 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 */ |
| instancemethod_getattro, /* tp_getattro */ |
| PyObject_GenericSetAttr, /* tp_setattro */ |
| 0, /* tp_as_buffer */ |
| Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_HAVE_WEAKREFS, /* 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); |
| } |
| } |