ref: ef17043327d999101009f85aae72f77399db15ac
dir: /sys/src/cmd/python/Objects/classobject.c/
/* 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_CallFunctionObjArgs(
(PyObject *) base->ob_type,
name, bases, dict, NULL);
PyErr_SetString(PyExc_TypeError,
"PyClass_New: base must be a class");
return NULL;
}
}
Py_INCREF(bases);
}
if (getattrstr == NULL) {
getattrstr = PyString_InternFromString("__getattr__");
if (getattrstr == NULL)
goto alloc_error;
setattrstr = PyString_InternFromString("__setattr__");
if (setattrstr == NULL)
goto alloc_error;
delattrstr = PyString_InternFromString("__delattr__");
if (delattrstr == NULL)
goto alloc_error;
}
op = PyObject_GC_New(PyClassObject, &PyClass_Type);
if (op == NULL) {
alloc_error:
Py_DECREF(bases);
return NULL;
}
op->cl_bases = bases;
Py_INCREF(dict);
op->cl_dict = dict;
Py_XINCREF(name);
op->cl_name = name;
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] == '_') {
Py_ssize_t 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;
Py_ssize_t 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)
{
Py_VISIT(o->cl_bases);
Py_VISIT(o->cl_dict);
Py_VISIT(o->cl_name);
Py_VISIT(o->cl_getattr);
Py_VISIT(o->cl_setattr);
Py_VISIT(o->cl_delattr);
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;
if (initstr == NULL) {
initstr = PyString_InternFromString("__init__");
if (initstr == NULL)
return NULL;
}
inst = (PyInstanceObject *) PyInstance_NewRaw(klass, NULL);
if (inst == NULL)
return NULL;
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 (delstr == NULL)
PyErr_WriteUnraisable((PyObject*)inst);
}
if (delstr && (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 {
Py_ssize_t 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] == '_') {
Py_ssize_t 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__");
if (reprstr == NULL)
return NULL;
}
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__");
if (strstr == NULL)
return NULL;
}
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__");
if (hashstr == NULL)
return -1;
}
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__");
if (eqstr == NULL)
return -1;
}
func = instance_getattr(inst, eqstr);
if (func == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return -1;
PyErr_Clear();
if (cmpstr == NULL) {
cmpstr = PyString_InternFromString("__cmp__");
if (cmpstr == NULL)
return -1;
}
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) || PyLong_Check(res))
/* This already converts a -1 result to -2. */
outcome = res->ob_type->tp_hash(res);
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)
{
Py_VISIT(o->in_class);
Py_VISIT(o->in_dict);
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__");
if (lenstr == NULL)
return -1;
}
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_AsSsize_t(res);
if (outcome == -1 && PyErr_Occurred()) {
Py_DECREF(res);
return -1;
}
#if SIZEOF_SIZE_T < SIZEOF_INT
/* Overflow check -- range of PyInt is more than C int */
if (outcome != (int)outcome) {
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");
outcome = -1;
}
}
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__");
if (getitemstr == NULL)
return NULL;
}
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__");
if (delitemstr == NULL)
return -1;
}
func = instance_getattr(inst, delitemstr);
}
else {
if (setitemstr == NULL) {
setitemstr = PyString_InternFromString("__setitem__");
if (setitemstr == NULL)
return -1;
}
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, *res;
if (getitemstr == NULL) {
getitemstr = PyString_InternFromString("__getitem__");
if (getitemstr == NULL)
return NULL;
}
func = instance_getattr(inst, getitemstr);
if (func == NULL)
return NULL;
res = PyObject_CallFunction(func, "n", i);
Py_DECREF(func);
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__");
if (getslicestr == NULL)
return NULL;
}
func = instance_getattr(inst, getslicestr);
if (func == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return NULL;
PyErr_Clear();
if (getitemstr == NULL) {
getitemstr = PyString_InternFromString("__getitem__");
if (getitemstr == NULL)
return NULL;
}
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__");
if (delitemstr == NULL)
return -1;
}
func = instance_getattr(inst, delitemstr);
}
else {
if (setitemstr == NULL) {
setitemstr = PyString_InternFromString("__setitem__");
if (setitemstr == NULL)
return -1;
}
func = instance_getattr(inst, setitemstr);
}
if (func == NULL)
return -1;
if (item == NULL)
arg = PyInt_FromSsize_t(i);
else
arg = Py_BuildValue("(nO)", 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__");
if (delslicestr == NULL)
return -1;
}
func = instance_getattr(inst, delslicestr);
if (func == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return -1;
PyErr_Clear();
if (delitemstr == NULL) {
delitemstr =
PyString_InternFromString("__delitem__");
if (delitemstr == NULL)
return -1;
}
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__");
if (setslicestr == NULL)
return -1;
}
func = instance_getattr(inst, setslicestr);
if (func == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return -1;
PyErr_Clear();
if (setitemstr == NULL) {
setitemstr =
PyString_InternFromString("__setitem__");
if (setitemstr == NULL)
return -1;
}
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)) {
Py_ssize_t rc;
/* Assume the failure was simply due to that there is no
* __contains__ attribute, and try iterating instead.
*/
PyErr_Clear();
rc = _PySequence_IterSearch((PyObject *)inst, member,
PY_ITERSEARCH_CONTAINS);
if (rc >= 0)
return rc > 0;
}
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 (Py_EnterRecursiveCall(" after coercion"))
return NULL;
if (swapped)
result = (thisfunc)(w, v1);
else
result = (thisfunc)(v1, w);
Py_LeaveRecursiveCall();
}
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); \
if (o == NULL) return NULL; } \
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 (nonzerostr == NULL)
return -1;
}
if ((func = instance_getattr(self, nonzerostr)) == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return -1;
PyErr_Clear();
if (lenstr == NULL) {
lenstr = PyString_InternFromString("__len__");
if (lenstr == NULL)
return -1;
}
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 PyObject *
instance_index(PyInstanceObject *self)
{
PyObject *func, *res;
static PyObject *indexstr = NULL;
if (indexstr == NULL) {
indexstr = PyString_InternFromString("__index__");
if (indexstr == NULL)
return NULL;
}
if ((func = instance_getattr(self, indexstr)) == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return NULL;
PyErr_Clear();
PyErr_SetString(PyExc_TypeError,
"object cannot be interpreted as an index");
return NULL;
}
res = PyEval_CallObject(func, (PyObject *)NULL);
Py_DECREF(func);
return res;
}
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 (nextstr == NULL)
return NULL;
}
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 */
(unaryfunc)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_NoKeywords("instancemethod", kw))
return 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)
{
int cmp;
cmp = PyObject_Compare(a->im_func, b->im_func);
if (cmp)
return cmp;
if (a->im_self == b->im_self)
return 0;
if (a->im_self == NULL || b->im_self == NULL)
return (a->im_self < b->im_self) ? -1 : 1;
else
return PyObject_Compare(a->im_self, b->im_self);
}
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;
x = x ^ y;
if (x == -1)
x = -2;
return x;
}
static int
instancemethod_traverse(PyMethodObject *im, visitproc visit, void *arg)
{
Py_VISIT(im->im_func);
Py_VISIT(im->im_self);
Py_VISIT(im->im_class);
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);
}
}