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1108 lines (1003 loc) · 32 KB
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Copy pathfuncobject.c
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1108 lines (1003 loc) · 32 KB
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/* Function object implementation */
#include "Python.h"
#include "code.h"
#include "structmember.h"
PyObject *
PyFunction_NewWithQualName(PyObject *code, PyObject *globals, PyObject *qualname)
{
PyFunctionObject *op = PyObject_GC_New(PyFunctionObject,
&PyFunction_Type);
static PyObject *__name__ = 0;
if (op != NULL) {
PyObject *doc;
PyObject *consts;
PyObject *module;
op->func_weakreflist = NULL;
Py_INCREF(code);
op->func_code = code;
Py_INCREF(globals);
op->func_globals = globals;
op->func_name = ((PyCodeObject *)code)->co_name;
Py_INCREF(op->func_name);
op->func_defaults = NULL; /* No default arguments */
op->func_kwdefaults = NULL; /* No keyword only defaults */
op->func_closure = NULL;
consts = ((PyCodeObject *)code)->co_consts;
if (PyTuple_Size(consts) >= 1) {
doc = PyTuple_GetItem(consts, 0);
if (!PyUnicode_Check(doc))
doc = Py_None;
}
else
doc = Py_None;
Py_INCREF(doc);
op->func_doc = doc;
op->func_dict = NULL;
op->func_module = NULL;
op->func_annotations = NULL;
/* __module__: If module name is in globals, use it.
Otherwise, use None.
*/
if (!__name__) {
__name__ = PyUnicode_InternFromString("__name__");
if (!__name__) {
Py_DECREF(op);
return NULL;
}
}
module = PyDict_GetItem(globals, __name__);
if (module) {
Py_INCREF(module);
op->func_module = module;
}
if (qualname)
op->func_qualname = qualname;
else
op->func_qualname = op->func_name;
Py_INCREF(op->func_qualname);
}
else
return NULL;
_PyObject_GC_TRACK(op);
return (PyObject *)op;
}
PyObject *
PyFunction_New(PyObject *code, PyObject *globals)
{
return PyFunction_NewWithQualName(code, globals, NULL);
}
PyObject *
PyFunction_GetCode(PyObject *op)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyFunctionObject *) op) -> func_code;
}
PyObject *
PyFunction_GetGlobals(PyObject *op)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyFunctionObject *) op) -> func_globals;
}
PyObject *
PyFunction_GetModule(PyObject *op)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyFunctionObject *) op) -> func_module;
}
PyObject *
PyFunction_GetDefaults(PyObject *op)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyFunctionObject *) op) -> func_defaults;
}
int
PyFunction_SetDefaults(PyObject *op, PyObject *defaults)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
if (defaults == Py_None)
defaults = NULL;
else if (defaults && PyTuple_Check(defaults)) {
Py_INCREF(defaults);
}
else {
PyErr_SetString(PyExc_SystemError, "non-tuple default args");
return -1;
}
Py_XDECREF(((PyFunctionObject *) op) -> func_defaults);
((PyFunctionObject *) op) -> func_defaults = defaults;
return 0;
}
PyObject *
PyFunction_GetKwDefaults(PyObject *op)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyFunctionObject *) op) -> func_kwdefaults;
}
int
PyFunction_SetKwDefaults(PyObject *op, PyObject *defaults)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
if (defaults == Py_None)
defaults = NULL;
else if (defaults && PyDict_Check(defaults)) {
Py_INCREF(defaults);
}
else {
PyErr_SetString(PyExc_SystemError,
"non-dict keyword only default args");
return -1;
}
Py_XDECREF(((PyFunctionObject *)op) -> func_kwdefaults);
((PyFunctionObject *) op) -> func_kwdefaults = defaults;
return 0;
}
PyObject *
PyFunction_GetClosure(PyObject *op)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyFunctionObject *) op) -> func_closure;
}
int
PyFunction_SetClosure(PyObject *op, PyObject *closure)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
if (closure == Py_None)
closure = NULL;
else if (PyTuple_Check(closure)) {
Py_INCREF(closure);
}
else {
PyErr_Format(PyExc_SystemError,
"expected tuple for closure, got '%.100s'",
closure->ob_type->tp_name);
return -1;
}
Py_XDECREF(((PyFunctionObject *) op) -> func_closure);
((PyFunctionObject *) op) -> func_closure = closure;
return 0;
}
PyObject *
PyFunction_GetAnnotations(PyObject *op)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyFunctionObject *) op) -> func_annotations;
}
int
PyFunction_SetAnnotations(PyObject *op, PyObject *annotations)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
if (annotations == Py_None)
annotations = NULL;
else if (annotations && PyDict_Check(annotations)) {
Py_INCREF(annotations);
}
else {
PyErr_SetString(PyExc_SystemError,
"non-dict annotations");
return -1;
}
Py_XDECREF(((PyFunctionObject *)op) -> func_annotations);
((PyFunctionObject *) op) -> func_annotations = annotations;
return 0;
}
/* Methods */
#define OFF(x) offsetof(PyFunctionObject, x)
static PyMemberDef func_memberlist[] = {
{"__closure__", T_OBJECT, OFF(func_closure),
RESTRICTED|READONLY},
{"__doc__", T_OBJECT, OFF(func_doc), PY_WRITE_RESTRICTED},
{"__globals__", T_OBJECT, OFF(func_globals),
RESTRICTED|READONLY},
{"__module__", T_OBJECT, OFF(func_module), PY_WRITE_RESTRICTED},
{NULL} /* Sentinel */
};
static PyObject *
func_get_dict(PyFunctionObject *op)
{
if (op->func_dict == NULL) {
op->func_dict = PyDict_New();
if (op->func_dict == NULL)
return NULL;
}
Py_INCREF(op->func_dict);
return op->func_dict;
}
static int
func_set_dict(PyFunctionObject *op, PyObject *value)
{
PyObject *tmp;
/* It is illegal to del f.func_dict */
if (value == NULL) {
PyErr_SetString(PyExc_TypeError,
"function's dictionary may not be deleted");
return -1;
}
/* Can only set func_dict to a dictionary */
if (!PyDict_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"setting function's dictionary to a non-dict");
return -1;
}
tmp = op->func_dict;
Py_INCREF(value);
op->func_dict = value;
Py_XDECREF(tmp);
return 0;
}
static PyObject *
func_get_code(PyFunctionObject *op)
{
Py_INCREF(op->func_code);
return op->func_code;
}
static int
func_set_code(PyFunctionObject *op, PyObject *value)
{
PyObject *tmp;
Py_ssize_t nfree, nclosure;
/* Not legal to del f.func_code or to set it to anything
* other than a code object. */
if (value == NULL || !PyCode_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"__code__ must be set to a code object");
return -1;
}
nfree = PyCode_GetNumFree((PyCodeObject *)value);
nclosure = (op->func_closure == NULL ? 0 :
PyTuple_GET_SIZE(op->func_closure));
if (nclosure != nfree) {
PyErr_Format(PyExc_ValueError,
"%U() requires a code object with %zd free vars,"
" not %zd",
op->func_name,
nclosure, nfree);
return -1;
}
tmp = op->func_code;
Py_INCREF(value);
op->func_code = value;
Py_DECREF(tmp);
return 0;
}
static PyObject *
func_get_name(PyFunctionObject *op)
{
Py_INCREF(op->func_name);
return op->func_name;
}
static int
func_set_name(PyFunctionObject *op, PyObject *value)
{
PyObject *tmp;
/* Not legal to del f.func_name or to set it to anything
* other than a string object. */
if (value == NULL || !PyUnicode_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"__name__ must be set to a string object");
return -1;
}
tmp = op->func_name;
Py_INCREF(value);
op->func_name = value;
Py_DECREF(tmp);
return 0;
}
static PyObject *
func_get_qualname(PyFunctionObject *op)
{
Py_INCREF(op->func_qualname);
return op->func_qualname;
}
static int
func_set_qualname(PyFunctionObject *op, PyObject *value)
{
PyObject *tmp;
/* Not legal to del f.__qualname__ or to set it to anything
* other than a string object. */
if (value == NULL || !PyUnicode_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"__qualname__ must be set to a string object");
return -1;
}
tmp = op->func_qualname;
Py_INCREF(value);
op->func_qualname = value;
Py_DECREF(tmp);
return 0;
}
static PyObject *
func_get_defaults(PyFunctionObject *op)
{
if (op->func_defaults == NULL) {
Py_INCREF(Py_None);
return Py_None;
}
Py_INCREF(op->func_defaults);
return op->func_defaults;
}
static int
func_set_defaults(PyFunctionObject *op, PyObject *value)
{
PyObject *tmp;
/* Legal to del f.func_defaults.
* Can only set func_defaults to NULL or a tuple. */
if (value == Py_None)
value = NULL;
if (value != NULL && !PyTuple_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"__defaults__ must be set to a tuple object");
return -1;
}
tmp = op->func_defaults;
Py_XINCREF(value);
op->func_defaults = value;
Py_XDECREF(tmp);
return 0;
}
static PyObject *
func_get_kwdefaults(PyFunctionObject *op)
{
if (op->func_kwdefaults == NULL) {
Py_INCREF(Py_None);
return Py_None;
}
Py_INCREF(op->func_kwdefaults);
return op->func_kwdefaults;
}
static int
func_set_kwdefaults(PyFunctionObject *op, PyObject *value)
{
PyObject *tmp;
if (value == Py_None)
value = NULL;
/* Legal to del f.func_kwdefaults.
* Can only set func_kwdefaults to NULL or a dict. */
if (value != NULL && !PyDict_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"__kwdefaults__ must be set to a dict object");
return -1;
}
tmp = op->func_kwdefaults;
Py_XINCREF(value);
op->func_kwdefaults = value;
Py_XDECREF(tmp);
return 0;
}
static PyObject *
func_get_annotations(PyFunctionObject *op)
{
if (op->func_annotations == NULL) {
op->func_annotations = PyDict_New();
if (op->func_annotations == NULL)
return NULL;
}
Py_INCREF(op->func_annotations);
return op->func_annotations;
}
static int
func_set_annotations(PyFunctionObject *op, PyObject *value)
{
PyObject *tmp;
if (value == Py_None)
value = NULL;
/* Legal to del f.func_annotations.
* Can only set func_annotations to NULL (through C api)
* or a dict. */
if (value != NULL && !PyDict_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"__annotations__ must be set to a dict object");
return -1;
}
tmp = op->func_annotations;
Py_XINCREF(value);
op->func_annotations = value;
Py_XDECREF(tmp);
return 0;
}
static PyGetSetDef func_getsetlist[] = {
{"__code__", (getter)func_get_code, (setter)func_set_code},
{"__defaults__", (getter)func_get_defaults,
(setter)func_set_defaults},
{"__kwdefaults__", (getter)func_get_kwdefaults,
(setter)func_set_kwdefaults},
{"__annotations__", (getter)func_get_annotations,
(setter)func_set_annotations},
{"__dict__", (getter)func_get_dict, (setter)func_set_dict},
{"__name__", (getter)func_get_name, (setter)func_set_name},
{"__qualname__", (getter)func_get_qualname, (setter)func_set_qualname},
{NULL} /* Sentinel */
};
PyDoc_STRVAR(func_doc,
"function(code, globals[, name[, argdefs[, closure]]])\n\
\n\
Create a function object from a code object and a dictionary.\n\
The optional name string overrides the name from the code object.\n\
The optional argdefs tuple specifies the default argument values.\n\
The optional closure tuple supplies the bindings for free variables.");
/* func_new() maintains the following invariants for closures. The
closure must correspond to the free variables of the code object.
if len(code.co_freevars) == 0:
closure = NULL
else:
len(closure) == len(code.co_freevars)
for every elt in closure, type(elt) == cell
*/
static PyObject *
func_new(PyTypeObject* type, PyObject* args, PyObject* kw)
{
PyCodeObject *code;
PyObject *globals;
PyObject *name = Py_None;
PyObject *defaults = Py_None;
PyObject *closure = Py_None;
PyFunctionObject *newfunc;
Py_ssize_t nfree, nclosure;
static char *kwlist[] = {"code", "globals", "name",
"argdefs", "closure", 0};
if (!PyArg_ParseTupleAndKeywords(args, kw, "O!O!|OOO:function",
kwlist,
&PyCode_Type, &code,
&PyDict_Type, &globals,
&name, &defaults, &closure))
return NULL;
if (name != Py_None && !PyUnicode_Check(name)) {
PyErr_SetString(PyExc_TypeError,
"arg 3 (name) must be None or string");
return NULL;
}
if (defaults != Py_None && !PyTuple_Check(defaults)) {
PyErr_SetString(PyExc_TypeError,
"arg 4 (defaults) must be None or tuple");
return NULL;
}
nfree = PyTuple_GET_SIZE(code->co_freevars);
if (!PyTuple_Check(closure)) {
if (nfree && closure == Py_None) {
PyErr_SetString(PyExc_TypeError,
"arg 5 (closure) must be tuple");
return NULL;
}
else if (closure != Py_None) {
PyErr_SetString(PyExc_TypeError,
"arg 5 (closure) must be None or tuple");
return NULL;
}
}
/* check that the closure is well-formed */
nclosure = closure == Py_None ? 0 : PyTuple_GET_SIZE(closure);
if (nfree != nclosure)
return PyErr_Format(PyExc_ValueError,
"%U requires closure of length %zd, not %zd",
code->co_name, nfree, nclosure);
if (nclosure) {
Py_ssize_t i;
for (i = 0; i < nclosure; i++) {
PyObject *o = PyTuple_GET_ITEM(closure, i);
if (!PyCell_Check(o)) {
return PyErr_Format(PyExc_TypeError,
"arg 5 (closure) expected cell, found %s",
o->ob_type->tp_name);
}
}
}
newfunc = (PyFunctionObject *)PyFunction_New((PyObject *)code,
globals);
if (newfunc == NULL)
return NULL;
if (name != Py_None) {
Py_INCREF(name);
Py_DECREF(newfunc->func_name);
newfunc->func_name = name;
}
if (defaults != Py_None) {
Py_INCREF(defaults);
newfunc->func_defaults = defaults;
}
if (closure != Py_None) {
Py_INCREF(closure);
newfunc->func_closure = closure;
}
return (PyObject *)newfunc;
}
static void
func_dealloc(PyFunctionObject *op)
{
_PyObject_GC_UNTRACK(op);
if (op->func_weakreflist != NULL)
PyObject_ClearWeakRefs((PyObject *) op);
Py_DECREF(op->func_code);
Py_DECREF(op->func_globals);
Py_XDECREF(op->func_module);
Py_DECREF(op->func_name);
Py_XDECREF(op->func_defaults);
Py_XDECREF(op->func_kwdefaults);
Py_XDECREF(op->func_doc);
Py_XDECREF(op->func_dict);
Py_XDECREF(op->func_closure);
Py_XDECREF(op->func_annotations);
Py_XDECREF(op->func_qualname);
PyObject_GC_Del(op);
}
static PyObject*
func_repr(PyFunctionObject *op)
{
return PyUnicode_FromFormat("<function %U at %p>",
op->func_qualname, op);
}
static int
func_traverse(PyFunctionObject *f, visitproc visit, void *arg)
{
Py_VISIT(f->func_code);
Py_VISIT(f->func_globals);
Py_VISIT(f->func_module);
Py_VISIT(f->func_defaults);
Py_VISIT(f->func_kwdefaults);
Py_VISIT(f->func_doc);
Py_VISIT(f->func_name);
Py_VISIT(f->func_dict);
Py_VISIT(f->func_closure);
Py_VISIT(f->func_annotations);
Py_VISIT(f->func_qualname);
return 0;
}
static PyObject *
function_call(PyObject *func, PyObject *arg, PyObject *kw)
{
PyObject *result;
PyObject *argdefs;
PyObject *kwtuple = NULL;
PyObject **d, **k;
Py_ssize_t nk, nd;
argdefs = PyFunction_GET_DEFAULTS(func);
if (argdefs != NULL && PyTuple_Check(argdefs)) {
d = &PyTuple_GET_ITEM((PyTupleObject *)argdefs, 0);
nd = PyTuple_GET_SIZE(argdefs);
}
else {
d = NULL;
nd = 0;
}
if (kw != NULL && PyDict_Check(kw)) {
Py_ssize_t pos, i;
nk = PyDict_Size(kw);
kwtuple = PyTuple_New(2*nk);
if (kwtuple == NULL)
return NULL;
k = &PyTuple_GET_ITEM(kwtuple, 0);
pos = i = 0;
while (PyDict_Next(kw, &pos, &k[i], &k[i+1])) {
Py_INCREF(k[i]);
Py_INCREF(k[i+1]);
i += 2;
}
nk = i/2;
}
else {
k = NULL;
nk = 0;
}
result = PyEval_EvalCodeEx(
PyFunction_GET_CODE(func),
PyFunction_GET_GLOBALS(func), (PyObject *)NULL,
&PyTuple_GET_ITEM(arg, 0), PyTuple_GET_SIZE(arg),
k, nk, d, nd,
PyFunction_GET_KW_DEFAULTS(func),
PyFunction_GET_CLOSURE(func));
Py_XDECREF(kwtuple);
return result;
}
/* Bind a function to an object */
static PyObject *
func_descr_get(PyObject *func, PyObject *obj, PyObject *type)
{
if (obj == Py_None || obj == NULL) {
Py_INCREF(func);
return func;
}
return PyMethod_New(func, obj);
}
PyTypeObject PyFunction_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"function",
sizeof(PyFunctionObject),
0,
(destructor)func_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
(reprfunc)func_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
function_call, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
PyObject_GenericSetAttr, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
func_doc, /* tp_doc */
(traverseproc)func_traverse, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
offsetof(PyFunctionObject, func_weakreflist), /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
func_memberlist, /* tp_members */
func_getsetlist, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
func_descr_get, /* tp_descr_get */
0, /* tp_descr_set */
offsetof(PyFunctionObject, func_dict), /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
func_new, /* tp_new */
};
/* Class method object */
/* A class method receives the class as implicit first argument,
just like an instance method receives the instance.
To declare a class method, use this idiom:
class C:
def f(cls, arg1, arg2, ...): ...
f = classmethod(f)
It can be called either on the class (e.g. C.f()) or on an instance
(e.g. C().f()); the instance is ignored except for its class.
If a class method is called for a derived class, the derived class
object is passed as the implied first argument.
Class methods are different than C++ or Java static methods.
If you want those, see static methods below.
*/
typedef struct {
PyObject_HEAD
PyObject *cm_callable;
PyObject *cm_dict;
} classmethod;
static void
cm_dealloc(classmethod *cm)
{
_PyObject_GC_UNTRACK((PyObject *)cm);
Py_XDECREF(cm->cm_callable);
Py_XDECREF(cm->cm_dict);
Py_TYPE(cm)->tp_free((PyObject *)cm);
}
static int
cm_traverse(classmethod *cm, visitproc visit, void *arg)
{
Py_VISIT(cm->cm_callable);
Py_VISIT(cm->cm_dict);
return 0;
}
static int
cm_clear(classmethod *cm)
{
Py_CLEAR(cm->cm_callable);
Py_CLEAR(cm->cm_dict);
return 0;
}
static PyObject *
cm_descr_get(PyObject *self, PyObject *obj, PyObject *type)
{
classmethod *cm = (classmethod *)self;
if (cm->cm_callable == NULL) {
PyErr_SetString(PyExc_RuntimeError,
"uninitialized classmethod object");
return NULL;
}
if (type == NULL)
type = (PyObject *)(Py_TYPE(obj));
return PyMethod_New(cm->cm_callable, type);
}
static int
cm_init(PyObject *self, PyObject *args, PyObject *kwds)
{
classmethod *cm = (classmethod *)self;
PyObject *callable;
if (!PyArg_UnpackTuple(args, "classmethod", 1, 1, &callable))
return -1;
if (!_PyArg_NoKeywords("classmethod", kwds))
return -1;
Py_INCREF(callable);
cm->cm_callable = callable;
return 0;
}
static PyMemberDef cm_memberlist[] = {
{"__func__", T_OBJECT, offsetof(classmethod, cm_callable), READONLY},
{NULL} /* Sentinel */
};
static PyObject *
cm_get___isabstractmethod__(classmethod *cm, void *closure)
{
int res = _PyObject_IsAbstract(cm->cm_callable);
if (res == -1) {
return NULL;
}
else if (res) {
Py_RETURN_TRUE;
}
Py_RETURN_FALSE;
}
static PyObject *
cm_get___dict__(classmethod *cm, void *closure)
{
Py_INCREF(cm->cm_dict);
return cm->cm_dict;
}
static PyGetSetDef cm_getsetlist[] = {
{"__isabstractmethod__",
(getter)cm_get___isabstractmethod__, NULL,
NULL,
NULL},
{"__dict__", (getter)cm_get___dict__, NULL, NULL, NULL},
{NULL} /* Sentinel */
};
PyDoc_STRVAR(classmethod_doc,
"classmethod(function) -> method\n\
\n\
Convert a function to be a class method.\n\
\n\
A class method receives the class as implicit first argument,\n\
just like an instance method receives the instance.\n\
To declare a class method, use this idiom:\n\
\n\
class C:\n\
def f(cls, arg1, arg2, ...): ...\n\
f = classmethod(f)\n\
\n\
It can be called either on the class (e.g. C.f()) or on an instance\n\
(e.g. C().f()). The instance is ignored except for its class.\n\
If a class method is called for a derived class, the derived class\n\
object is passed as the implied first argument.\n\
\n\
Class methods are different than C++ or Java static methods.\n\
If you want those, see the staticmethod builtin.");
PyTypeObject PyClassMethod_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"classmethod",
sizeof(classmethod),
0,
(destructor)cm_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
classmethod_doc, /* tp_doc */
(traverseproc)cm_traverse, /* tp_traverse */
(inquiry)cm_clear, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
cm_memberlist, /* tp_members */
cm_getsetlist, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
cm_descr_get, /* tp_descr_get */
0, /* tp_descr_set */
offsetof(classmethod, cm_dict), /* tp_dictoffset */
cm_init, /* tp_init */
PyType_GenericAlloc, /* tp_alloc */
PyType_GenericNew, /* tp_new */
PyObject_GC_Del, /* tp_free */
};
PyObject *
PyClassMethod_New(PyObject *callable)
{
classmethod *cm = (classmethod *)
PyType_GenericAlloc(&PyClassMethod_Type, 0);
if (cm != NULL) {
Py_INCREF(callable);
cm->cm_callable = callable;
}
return (PyObject *)cm;
}
/* Static method object */
/* A static method does not receive an implicit first argument.
To declare a static method, use this idiom:
class C:
def f(arg1, arg2, ...): ...
f = staticmethod(f)
It can be called either on the class (e.g. C.f()) or on an instance
(e.g. C().f()); the instance is ignored except for its class.
Static methods in Python are similar to those found in Java or C++.
For a more advanced concept, see class methods above.
*/
typedef struct {
PyObject_HEAD
PyObject *sm_callable;
PyObject *sm_dict;
} staticmethod;
static void
sm_dealloc(staticmethod *sm)
{
_PyObject_GC_UNTRACK((PyObject *)sm);
Py_XDECREF(sm->sm_callable);
Py_XDECREF(sm->sm_dict);
Py_TYPE(sm)->tp_free((PyObject *)sm);
}
static int
sm_traverse(staticmethod *sm, visitproc visit, void *arg)
{
Py_VISIT(sm->sm_callable);
Py_VISIT(sm->sm_dict);
return 0;
}
static int
sm_clear(staticmethod *sm)
{
Py_XDECREF(sm->sm_callable);
sm->sm_callable = NULL;
Py_CLEAR(sm->sm_dict);
return 0;
}
static PyObject *
sm_descr_get(PyObject *self, PyObject *obj, PyObject *type)
{
staticmethod *sm = (staticmethod *)self;
if (sm->sm_callable == NULL) {
PyErr_SetString(PyExc_RuntimeError,
"uninitialized staticmethod object");
return NULL;
}
Py_INCREF(sm->sm_callable);
return sm->sm_callable;
}
static int
sm_init(PyObject *self, PyObject *args, PyObject *kwds)
{
staticmethod *sm = (staticmethod *)self;
PyObject *callable;
if (!PyArg_UnpackTuple(args, "staticmethod", 1, 1, &callable))
return -1;
if (!_PyArg_NoKeywords("staticmethod", kwds))
return -1;
Py_INCREF(callable);
sm->sm_callable = callable;