This reverts r63675 based on the discussion in this thread:
[python.git] / Objects / funcobject.c
bloba2e87b733ccf69c3b23e8c1e068acfd45b61cf02
2 /* Function object implementation */
4 #include "Python.h"
5 #include "code.h"
6 #include "eval.h"
7 #include "structmember.h"
9 PyObject *
10 PyFunction_New(PyObject *code, PyObject *globals)
12 PyFunctionObject *op = PyObject_GC_New(PyFunctionObject,
13 &PyFunction_Type);
14 static PyObject *__name__ = 0;
15 if (op != NULL) {
16 PyObject *doc;
17 PyObject *consts;
18 PyObject *module;
19 op->func_weakreflist = NULL;
20 Py_INCREF(code);
21 op->func_code = code;
22 Py_INCREF(globals);
23 op->func_globals = globals;
24 op->func_name = ((PyCodeObject *)code)->co_name;
25 Py_INCREF(op->func_name);
26 op->func_defaults = NULL; /* No default arguments */
27 op->func_closure = NULL;
28 consts = ((PyCodeObject *)code)->co_consts;
29 if (PyTuple_Size(consts) >= 1) {
30 doc = PyTuple_GetItem(consts, 0);
31 if (!PyString_Check(doc) && !PyUnicode_Check(doc))
32 doc = Py_None;
34 else
35 doc = Py_None;
36 Py_INCREF(doc);
37 op->func_doc = doc;
38 op->func_dict = NULL;
39 op->func_module = NULL;
41 /* __module__: If module name is in globals, use it.
42 Otherwise, use None.
44 if (!__name__) {
45 __name__ = PyString_InternFromString("__name__");
46 if (!__name__) {
47 Py_DECREF(op);
48 return NULL;
51 module = PyDict_GetItem(globals, __name__);
52 if (module) {
53 Py_INCREF(module);
54 op->func_module = module;
57 else
58 return NULL;
59 _PyObject_GC_TRACK(op);
60 return (PyObject *)op;
63 PyObject *
64 PyFunction_GetCode(PyObject *op)
66 if (!PyFunction_Check(op)) {
67 PyErr_BadInternalCall();
68 return NULL;
70 return ((PyFunctionObject *) op) -> func_code;
73 PyObject *
74 PyFunction_GetGlobals(PyObject *op)
76 if (!PyFunction_Check(op)) {
77 PyErr_BadInternalCall();
78 return NULL;
80 return ((PyFunctionObject *) op) -> func_globals;
83 PyObject *
84 PyFunction_GetModule(PyObject *op)
86 if (!PyFunction_Check(op)) {
87 PyErr_BadInternalCall();
88 return NULL;
90 return ((PyFunctionObject *) op) -> func_module;
93 PyObject *
94 PyFunction_GetDefaults(PyObject *op)
96 if (!PyFunction_Check(op)) {
97 PyErr_BadInternalCall();
98 return NULL;
100 return ((PyFunctionObject *) op) -> func_defaults;
104 PyFunction_SetDefaults(PyObject *op, PyObject *defaults)
106 if (!PyFunction_Check(op)) {
107 PyErr_BadInternalCall();
108 return -1;
110 if (defaults == Py_None)
111 defaults = NULL;
112 else if (defaults && PyTuple_Check(defaults)) {
113 Py_INCREF(defaults);
115 else {
116 PyErr_SetString(PyExc_SystemError, "non-tuple default args");
117 return -1;
119 Py_XDECREF(((PyFunctionObject *) op) -> func_defaults);
120 ((PyFunctionObject *) op) -> func_defaults = defaults;
121 return 0;
124 PyObject *
125 PyFunction_GetClosure(PyObject *op)
127 if (!PyFunction_Check(op)) {
128 PyErr_BadInternalCall();
129 return NULL;
131 return ((PyFunctionObject *) op) -> func_closure;
135 PyFunction_SetClosure(PyObject *op, PyObject *closure)
137 if (!PyFunction_Check(op)) {
138 PyErr_BadInternalCall();
139 return -1;
141 if (closure == Py_None)
142 closure = NULL;
143 else if (PyTuple_Check(closure)) {
144 Py_INCREF(closure);
146 else {
147 PyErr_Format(PyExc_SystemError,
148 "expected tuple for closure, got '%.100s'",
149 closure->ob_type->tp_name);
150 return -1;
152 Py_XDECREF(((PyFunctionObject *) op) -> func_closure);
153 ((PyFunctionObject *) op) -> func_closure = closure;
154 return 0;
157 /* Methods */
159 #define OFF(x) offsetof(PyFunctionObject, x)
161 static PyMemberDef func_memberlist[] = {
162 {"func_closure", T_OBJECT, OFF(func_closure),
163 RESTRICTED|READONLY},
164 {"__closure__", T_OBJECT, OFF(func_closure),
165 RESTRICTED|READONLY},
166 {"func_doc", T_OBJECT, OFF(func_doc), PY_WRITE_RESTRICTED},
167 {"__doc__", T_OBJECT, OFF(func_doc), PY_WRITE_RESTRICTED},
168 {"func_globals", T_OBJECT, OFF(func_globals),
169 RESTRICTED|READONLY},
170 {"__globals__", T_OBJECT, OFF(func_globals),
171 RESTRICTED|READONLY},
172 {"__module__", T_OBJECT, OFF(func_module), PY_WRITE_RESTRICTED},
173 {NULL} /* Sentinel */
176 static int
177 restricted(void)
179 if (!PyEval_GetRestricted())
180 return 0;
181 PyErr_SetString(PyExc_RuntimeError,
182 "function attributes not accessible in restricted mode");
183 return 1;
186 static PyObject *
187 func_get_dict(PyFunctionObject *op)
189 if (restricted())
190 return NULL;
191 if (op->func_dict == NULL) {
192 op->func_dict = PyDict_New();
193 if (op->func_dict == NULL)
194 return NULL;
196 Py_INCREF(op->func_dict);
197 return op->func_dict;
200 static int
201 func_set_dict(PyFunctionObject *op, PyObject *value)
203 PyObject *tmp;
205 if (restricted())
206 return -1;
207 /* It is illegal to del f.func_dict */
208 if (value == NULL) {
209 PyErr_SetString(PyExc_TypeError,
210 "function's dictionary may not be deleted");
211 return -1;
213 /* Can only set func_dict to a dictionary */
214 if (!PyDict_Check(value)) {
215 PyErr_SetString(PyExc_TypeError,
216 "setting function's dictionary to a non-dict");
217 return -1;
219 tmp = op->func_dict;
220 Py_INCREF(value);
221 op->func_dict = value;
222 Py_XDECREF(tmp);
223 return 0;
226 static PyObject *
227 func_get_code(PyFunctionObject *op)
229 if (restricted())
230 return NULL;
231 Py_INCREF(op->func_code);
232 return op->func_code;
235 static int
236 func_set_code(PyFunctionObject *op, PyObject *value)
238 PyObject *tmp;
239 Py_ssize_t nfree, nclosure;
241 if (restricted())
242 return -1;
243 /* Not legal to del f.func_code or to set it to anything
244 * other than a code object. */
245 if (value == NULL || !PyCode_Check(value)) {
246 PyErr_SetString(PyExc_TypeError,
247 "__code__ must be set to a code object");
248 return -1;
250 nfree = PyCode_GetNumFree((PyCodeObject *)value);
251 nclosure = (op->func_closure == NULL ? 0 :
252 PyTuple_GET_SIZE(op->func_closure));
253 if (nclosure != nfree) {
254 PyErr_Format(PyExc_ValueError,
255 "%s() requires a code object with %zd free vars,"
256 " not %zd",
257 PyString_AsString(op->func_name),
258 nclosure, nfree);
259 return -1;
261 tmp = op->func_code;
262 Py_INCREF(value);
263 op->func_code = value;
264 Py_DECREF(tmp);
265 return 0;
268 static PyObject *
269 func_get_name(PyFunctionObject *op)
271 Py_INCREF(op->func_name);
272 return op->func_name;
275 static int
276 func_set_name(PyFunctionObject *op, PyObject *value)
278 PyObject *tmp;
280 if (restricted())
281 return -1;
282 /* Not legal to del f.func_name or to set it to anything
283 * other than a string object. */
284 if (value == NULL || !PyString_Check(value)) {
285 PyErr_SetString(PyExc_TypeError,
286 "__name__ must be set to a string object");
287 return -1;
289 tmp = op->func_name;
290 Py_INCREF(value);
291 op->func_name = value;
292 Py_DECREF(tmp);
293 return 0;
296 static PyObject *
297 func_get_defaults(PyFunctionObject *op)
299 if (restricted())
300 return NULL;
301 if (op->func_defaults == NULL) {
302 Py_INCREF(Py_None);
303 return Py_None;
305 Py_INCREF(op->func_defaults);
306 return op->func_defaults;
309 static int
310 func_set_defaults(PyFunctionObject *op, PyObject *value)
312 PyObject *tmp;
314 if (restricted())
315 return -1;
316 /* Legal to del f.func_defaults.
317 * Can only set func_defaults to NULL or a tuple. */
318 if (value == Py_None)
319 value = NULL;
320 if (value != NULL && !PyTuple_Check(value)) {
321 PyErr_SetString(PyExc_TypeError,
322 "__defaults__ must be set to a tuple object");
323 return -1;
325 tmp = op->func_defaults;
326 Py_XINCREF(value);
327 op->func_defaults = value;
328 Py_XDECREF(tmp);
329 return 0;
332 static PyGetSetDef func_getsetlist[] = {
333 {"func_code", (getter)func_get_code, (setter)func_set_code},
334 {"__code__", (getter)func_get_code, (setter)func_set_code},
335 {"func_defaults", (getter)func_get_defaults,
336 (setter)func_set_defaults},
337 {"__defaults__", (getter)func_get_defaults,
338 (setter)func_set_defaults},
339 {"func_dict", (getter)func_get_dict, (setter)func_set_dict},
340 {"__dict__", (getter)func_get_dict, (setter)func_set_dict},
341 {"func_name", (getter)func_get_name, (setter)func_set_name},
342 {"__name__", (getter)func_get_name, (setter)func_set_name},
343 {NULL} /* Sentinel */
346 PyDoc_STRVAR(func_doc,
347 "function(code, globals[, name[, argdefs[, closure]]])\n\
349 Create a function object from a code object and a dictionary.\n\
350 The optional name string overrides the name from the code object.\n\
351 The optional argdefs tuple specifies the default argument values.\n\
352 The optional closure tuple supplies the bindings for free variables.");
354 /* func_new() maintains the following invariants for closures. The
355 closure must correspond to the free variables of the code object.
357 if len(code.co_freevars) == 0:
358 closure = NULL
359 else:
360 len(closure) == len(code.co_freevars)
361 for every elt in closure, type(elt) == cell
364 static PyObject *
365 func_new(PyTypeObject* type, PyObject* args, PyObject* kw)
367 PyCodeObject *code;
368 PyObject *globals;
369 PyObject *name = Py_None;
370 PyObject *defaults = Py_None;
371 PyObject *closure = Py_None;
372 PyFunctionObject *newfunc;
373 Py_ssize_t nfree, nclosure;
374 static char *kwlist[] = {"code", "globals", "name",
375 "argdefs", "closure", 0};
377 if (!PyArg_ParseTupleAndKeywords(args, kw, "O!O!|OOO:function",
378 kwlist,
379 &PyCode_Type, &code,
380 &PyDict_Type, &globals,
381 &name, &defaults, &closure))
382 return NULL;
383 if (name != Py_None && !PyString_Check(name)) {
384 PyErr_SetString(PyExc_TypeError,
385 "arg 3 (name) must be None or string");
386 return NULL;
388 if (defaults != Py_None && !PyTuple_Check(defaults)) {
389 PyErr_SetString(PyExc_TypeError,
390 "arg 4 (defaults) must be None or tuple");
391 return NULL;
393 nfree = PyTuple_GET_SIZE(code->co_freevars);
394 if (!PyTuple_Check(closure)) {
395 if (nfree && closure == Py_None) {
396 PyErr_SetString(PyExc_TypeError,
397 "arg 5 (closure) must be tuple");
398 return NULL;
400 else if (closure != Py_None) {
401 PyErr_SetString(PyExc_TypeError,
402 "arg 5 (closure) must be None or tuple");
403 return NULL;
407 /* check that the closure is well-formed */
408 nclosure = closure == Py_None ? 0 : PyTuple_GET_SIZE(closure);
409 if (nfree != nclosure)
410 return PyErr_Format(PyExc_ValueError,
411 "%s requires closure of length %zd, not %zd",
412 PyString_AS_STRING(code->co_name),
413 nfree, nclosure);
414 if (nclosure) {
415 Py_ssize_t i;
416 for (i = 0; i < nclosure; i++) {
417 PyObject *o = PyTuple_GET_ITEM(closure, i);
418 if (!PyCell_Check(o)) {
419 return PyErr_Format(PyExc_TypeError,
420 "arg 5 (closure) expected cell, found %s",
421 o->ob_type->tp_name);
426 newfunc = (PyFunctionObject *)PyFunction_New((PyObject *)code,
427 globals);
428 if (newfunc == NULL)
429 return NULL;
431 if (name != Py_None) {
432 Py_INCREF(name);
433 Py_DECREF(newfunc->func_name);
434 newfunc->func_name = name;
436 if (defaults != Py_None) {
437 Py_INCREF(defaults);
438 newfunc->func_defaults = defaults;
440 if (closure != Py_None) {
441 Py_INCREF(closure);
442 newfunc->func_closure = closure;
445 return (PyObject *)newfunc;
448 static void
449 func_dealloc(PyFunctionObject *op)
451 _PyObject_GC_UNTRACK(op);
452 if (op->func_weakreflist != NULL)
453 PyObject_ClearWeakRefs((PyObject *) op);
454 Py_DECREF(op->func_code);
455 Py_DECREF(op->func_globals);
456 Py_XDECREF(op->func_module);
457 Py_DECREF(op->func_name);
458 Py_XDECREF(op->func_defaults);
459 Py_XDECREF(op->func_doc);
460 Py_XDECREF(op->func_dict);
461 Py_XDECREF(op->func_closure);
462 PyObject_GC_Del(op);
465 static PyObject*
466 func_repr(PyFunctionObject *op)
468 return PyString_FromFormat("<function %s at %p>",
469 PyString_AsString(op->func_name),
470 op);
473 static int
474 func_traverse(PyFunctionObject *f, visitproc visit, void *arg)
476 Py_VISIT(f->func_code);
477 Py_VISIT(f->func_globals);
478 Py_VISIT(f->func_module);
479 Py_VISIT(f->func_defaults);
480 Py_VISIT(f->func_doc);
481 Py_VISIT(f->func_name);
482 Py_VISIT(f->func_dict);
483 Py_VISIT(f->func_closure);
484 return 0;
487 static PyObject *
488 function_call(PyObject *func, PyObject *arg, PyObject *kw)
490 PyObject *result;
491 PyObject *argdefs;
492 PyObject **d, **k;
493 Py_ssize_t nk, nd;
495 argdefs = PyFunction_GET_DEFAULTS(func);
496 if (argdefs != NULL && PyTuple_Check(argdefs)) {
497 d = &PyTuple_GET_ITEM((PyTupleObject *)argdefs, 0);
498 nd = PyTuple_Size(argdefs);
500 else {
501 d = NULL;
502 nd = 0;
505 if (kw != NULL && PyDict_Check(kw)) {
506 Py_ssize_t pos, i;
507 nk = PyDict_Size(kw);
508 k = PyMem_NEW(PyObject *, 2*nk);
509 if (k == NULL) {
510 PyErr_NoMemory();
511 return NULL;
513 pos = i = 0;
514 while (PyDict_Next(kw, &pos, &k[i], &k[i+1]))
515 i += 2;
516 nk = i/2;
517 /* XXX This is broken if the caller deletes dict items! */
519 else {
520 k = NULL;
521 nk = 0;
524 result = PyEval_EvalCodeEx(
525 (PyCodeObject *)PyFunction_GET_CODE(func),
526 PyFunction_GET_GLOBALS(func), (PyObject *)NULL,
527 &PyTuple_GET_ITEM(arg, 0), PyTuple_Size(arg),
528 k, nk, d, nd,
529 PyFunction_GET_CLOSURE(func));
531 if (k != NULL)
532 PyMem_DEL(k);
534 return result;
537 /* Bind a function to an object */
538 static PyObject *
539 func_descr_get(PyObject *func, PyObject *obj, PyObject *type)
541 if (obj == Py_None)
542 obj = NULL;
543 return PyMethod_New(func, obj, type);
546 PyTypeObject PyFunction_Type = {
547 PyVarObject_HEAD_INIT(&PyType_Type, 0)
548 "function",
549 sizeof(PyFunctionObject),
551 (destructor)func_dealloc, /* tp_dealloc */
552 0, /* tp_print */
553 0, /* tp_getattr */
554 0, /* tp_setattr */
555 0, /* tp_compare */
556 (reprfunc)func_repr, /* tp_repr */
557 0, /* tp_as_number */
558 0, /* tp_as_sequence */
559 0, /* tp_as_mapping */
560 0, /* tp_hash */
561 function_call, /* tp_call */
562 0, /* tp_str */
563 PyObject_GenericGetAttr, /* tp_getattro */
564 PyObject_GenericSetAttr, /* tp_setattro */
565 0, /* tp_as_buffer */
566 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
567 func_doc, /* tp_doc */
568 (traverseproc)func_traverse, /* tp_traverse */
569 0, /* tp_clear */
570 0, /* tp_richcompare */
571 offsetof(PyFunctionObject, func_weakreflist), /* tp_weaklistoffset */
572 0, /* tp_iter */
573 0, /* tp_iternext */
574 0, /* tp_methods */
575 func_memberlist, /* tp_members */
576 func_getsetlist, /* tp_getset */
577 0, /* tp_base */
578 0, /* tp_dict */
579 func_descr_get, /* tp_descr_get */
580 0, /* tp_descr_set */
581 offsetof(PyFunctionObject, func_dict), /* tp_dictoffset */
582 0, /* tp_init */
583 0, /* tp_alloc */
584 func_new, /* tp_new */
588 /* Class method object */
590 /* A class method receives the class as implicit first argument,
591 just like an instance method receives the instance.
592 To declare a class method, use this idiom:
594 class C:
595 def f(cls, arg1, arg2, ...): ...
596 f = classmethod(f)
598 It can be called either on the class (e.g. C.f()) or on an instance
599 (e.g. C().f()); the instance is ignored except for its class.
600 If a class method is called for a derived class, the derived class
601 object is passed as the implied first argument.
603 Class methods are different than C++ or Java static methods.
604 If you want those, see static methods below.
607 typedef struct {
608 PyObject_HEAD
609 PyObject *cm_callable;
610 } classmethod;
612 static void
613 cm_dealloc(classmethod *cm)
615 _PyObject_GC_UNTRACK((PyObject *)cm);
616 Py_XDECREF(cm->cm_callable);
617 Py_TYPE(cm)->tp_free((PyObject *)cm);
620 static int
621 cm_traverse(classmethod *cm, visitproc visit, void *arg)
623 Py_VISIT(cm->cm_callable);
624 return 0;
627 static int
628 cm_clear(classmethod *cm)
630 Py_CLEAR(cm->cm_callable);
631 return 0;
635 static PyObject *
636 cm_descr_get(PyObject *self, PyObject *obj, PyObject *type)
638 classmethod *cm = (classmethod *)self;
640 if (cm->cm_callable == NULL) {
641 PyErr_SetString(PyExc_RuntimeError,
642 "uninitialized classmethod object");
643 return NULL;
645 if (type == NULL)
646 type = (PyObject *)(Py_TYPE(obj));
647 return PyMethod_New(cm->cm_callable,
648 type, (PyObject *)(Py_TYPE(type)));
651 static int
652 cm_init(PyObject *self, PyObject *args, PyObject *kwds)
654 classmethod *cm = (classmethod *)self;
655 PyObject *callable;
657 if (!PyArg_UnpackTuple(args, "classmethod", 1, 1, &callable))
658 return -1;
659 if (!_PyArg_NoKeywords("classmethod", kwds))
660 return -1;
661 if (!PyCallable_Check(callable)) {
662 PyErr_Format(PyExc_TypeError, "'%s' object is not callable",
663 callable->ob_type->tp_name);
664 return -1;
667 Py_INCREF(callable);
668 cm->cm_callable = callable;
669 return 0;
672 PyDoc_STRVAR(classmethod_doc,
673 "classmethod(function) -> method\n\
675 Convert a function to be a class method.\n\
677 A class method receives the class as implicit first argument,\n\
678 just like an instance method receives the instance.\n\
679 To declare a class method, use this idiom:\n\
681 class C:\n\
682 def f(cls, arg1, arg2, ...): ...\n\
683 f = classmethod(f)\n\
685 It can be called either on the class (e.g. C.f()) or on an instance\n\
686 (e.g. C().f()). The instance is ignored except for its class.\n\
687 If a class method is called for a derived class, the derived class\n\
688 object is passed as the implied first argument.\n\
690 Class methods are different than C++ or Java static methods.\n\
691 If you want those, see the staticmethod builtin.");
693 PyTypeObject PyClassMethod_Type = {
694 PyVarObject_HEAD_INIT(&PyType_Type, 0)
695 "classmethod",
696 sizeof(classmethod),
698 (destructor)cm_dealloc, /* tp_dealloc */
699 0, /* tp_print */
700 0, /* tp_getattr */
701 0, /* tp_setattr */
702 0, /* tp_compare */
703 0, /* tp_repr */
704 0, /* tp_as_number */
705 0, /* tp_as_sequence */
706 0, /* tp_as_mapping */
707 0, /* tp_hash */
708 0, /* tp_call */
709 0, /* tp_str */
710 PyObject_GenericGetAttr, /* tp_getattro */
711 0, /* tp_setattro */
712 0, /* tp_as_buffer */
713 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
714 classmethod_doc, /* tp_doc */
715 (traverseproc)cm_traverse, /* tp_traverse */
716 (inquiry)cm_clear, /* tp_clear */
717 0, /* tp_richcompare */
718 0, /* tp_weaklistoffset */
719 0, /* tp_iter */
720 0, /* tp_iternext */
721 0, /* tp_methods */
722 0, /* tp_members */
723 0, /* tp_getset */
724 0, /* tp_base */
725 0, /* tp_dict */
726 cm_descr_get, /* tp_descr_get */
727 0, /* tp_descr_set */
728 0, /* tp_dictoffset */
729 cm_init, /* tp_init */
730 PyType_GenericAlloc, /* tp_alloc */
731 PyType_GenericNew, /* tp_new */
732 PyObject_GC_Del, /* tp_free */
735 PyObject *
736 PyClassMethod_New(PyObject *callable)
738 classmethod *cm = (classmethod *)
739 PyType_GenericAlloc(&PyClassMethod_Type, 0);
740 if (cm != NULL) {
741 Py_INCREF(callable);
742 cm->cm_callable = callable;
744 return (PyObject *)cm;
748 /* Static method object */
750 /* A static method does not receive an implicit first argument.
751 To declare a static method, use this idiom:
753 class C:
754 def f(arg1, arg2, ...): ...
755 f = staticmethod(f)
757 It can be called either on the class (e.g. C.f()) or on an instance
758 (e.g. C().f()); the instance is ignored except for its class.
760 Static methods in Python are similar to those found in Java or C++.
761 For a more advanced concept, see class methods above.
764 typedef struct {
765 PyObject_HEAD
766 PyObject *sm_callable;
767 } staticmethod;
769 static void
770 sm_dealloc(staticmethod *sm)
772 _PyObject_GC_UNTRACK((PyObject *)sm);
773 Py_XDECREF(sm->sm_callable);
774 Py_TYPE(sm)->tp_free((PyObject *)sm);
777 static int
778 sm_traverse(staticmethod *sm, visitproc visit, void *arg)
780 Py_VISIT(sm->sm_callable);
781 return 0;
784 static int
785 sm_clear(staticmethod *sm)
787 Py_XDECREF(sm->sm_callable);
788 sm->sm_callable = NULL;
790 return 0;
793 static PyObject *
794 sm_descr_get(PyObject *self, PyObject *obj, PyObject *type)
796 staticmethod *sm = (staticmethod *)self;
798 if (sm->sm_callable == NULL) {
799 PyErr_SetString(PyExc_RuntimeError,
800 "uninitialized staticmethod object");
801 return NULL;
803 Py_INCREF(sm->sm_callable);
804 return sm->sm_callable;
807 static int
808 sm_init(PyObject *self, PyObject *args, PyObject *kwds)
810 staticmethod *sm = (staticmethod *)self;
811 PyObject *callable;
813 if (!PyArg_UnpackTuple(args, "staticmethod", 1, 1, &callable))
814 return -1;
815 if (!_PyArg_NoKeywords("staticmethod", kwds))
816 return -1;
817 Py_INCREF(callable);
818 sm->sm_callable = callable;
819 return 0;
822 PyDoc_STRVAR(staticmethod_doc,
823 "staticmethod(function) -> method\n\
825 Convert a function to be a static method.\n\
827 A static method does not receive an implicit first argument.\n\
828 To declare a static method, use this idiom:\n\
830 class C:\n\
831 def f(arg1, arg2, ...): ...\n\
832 f = staticmethod(f)\n\
834 It can be called either on the class (e.g. C.f()) or on an instance\n\
835 (e.g. C().f()). The instance is ignored except for its class.\n\
837 Static methods in Python are similar to those found in Java or C++.\n\
838 For a more advanced concept, see the classmethod builtin.");
840 PyTypeObject PyStaticMethod_Type = {
841 PyVarObject_HEAD_INIT(&PyType_Type, 0)
842 "staticmethod",
843 sizeof(staticmethod),
845 (destructor)sm_dealloc, /* tp_dealloc */
846 0, /* tp_print */
847 0, /* tp_getattr */
848 0, /* tp_setattr */
849 0, /* tp_compare */
850 0, /* tp_repr */
851 0, /* tp_as_number */
852 0, /* tp_as_sequence */
853 0, /* tp_as_mapping */
854 0, /* tp_hash */
855 0, /* tp_call */
856 0, /* tp_str */
857 PyObject_GenericGetAttr, /* tp_getattro */
858 0, /* tp_setattro */
859 0, /* tp_as_buffer */
860 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
861 staticmethod_doc, /* tp_doc */
862 (traverseproc)sm_traverse, /* tp_traverse */
863 (inquiry)sm_clear, /* tp_clear */
864 0, /* tp_richcompare */
865 0, /* tp_weaklistoffset */
866 0, /* tp_iter */
867 0, /* tp_iternext */
868 0, /* tp_methods */
869 0, /* tp_members */
870 0, /* tp_getset */
871 0, /* tp_base */
872 0, /* tp_dict */
873 sm_descr_get, /* tp_descr_get */
874 0, /* tp_descr_set */
875 0, /* tp_dictoffset */
876 sm_init, /* tp_init */
877 PyType_GenericAlloc, /* tp_alloc */
878 PyType_GenericNew, /* tp_new */
879 PyObject_GC_Del, /* tp_free */
882 PyObject *
883 PyStaticMethod_New(PyObject *callable)
885 staticmethod *sm = (staticmethod *)
886 PyType_GenericAlloc(&PyStaticMethod_Type, 0);
887 if (sm != NULL) {
888 Py_INCREF(callable);
889 sm->sm_callable = callable;
891 return (PyObject *)sm;