mirror of
https://github.com/python/cpython.git
synced 2025-11-04 03:44:55 +00:00
af68c874a6
In C++, it's an error to pass a string literal to a char* function without a const_cast(). Rather than require every C++ extension module to put a cast around string literals, fix the API to state the const-ness. I focused on parts of the API where people usually pass literals: PyArg_ParseTuple() and friends, Py_BuildValue(), PyMethodDef, the type slots, etc. Predictably, there were a large set of functions that needed to be fixed as a result of these changes. The most pervasive change was to make the keyword args list passed to PyArg_ParseTupleAndKewords() to be a const char *kwlist[]. One cast was required as a result of the changes: A type object mallocs the memory for its tp_doc slot and later frees it. PyTypeObject says that tp_doc is const char *; but if the type was created by type_new(), we know it is safe to cast to char *.
921 lines
21 KiB
C
921 lines
21 KiB
C
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/* Function object implementation */
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#include "Python.h"
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#include "code.h"
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#include "eval.h"
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#include "structmember.h"
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PyObject *
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PyFunction_New(PyObject *code, PyObject *globals)
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{
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PyFunctionObject *op = PyObject_GC_New(PyFunctionObject,
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&PyFunction_Type);
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static PyObject *__name__ = 0;
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if (op != NULL) {
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PyObject *doc;
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PyObject *consts;
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PyObject *module;
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op->func_weakreflist = NULL;
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Py_INCREF(code);
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op->func_code = code;
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Py_INCREF(globals);
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op->func_globals = globals;
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op->func_name = ((PyCodeObject *)code)->co_name;
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Py_INCREF(op->func_name);
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op->func_defaults = NULL; /* No default arguments */
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op->func_closure = NULL;
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consts = ((PyCodeObject *)code)->co_consts;
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if (PyTuple_Size(consts) >= 1) {
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doc = PyTuple_GetItem(consts, 0);
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if (!PyString_Check(doc) && !PyUnicode_Check(doc))
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doc = Py_None;
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}
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else
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doc = Py_None;
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Py_INCREF(doc);
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op->func_doc = doc;
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op->func_dict = NULL;
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op->func_module = NULL;
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/* __module__: If module name is in globals, use it.
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Otherwise, use None.
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*/
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if (!__name__) {
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__name__ = PyString_InternFromString("__name__");
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if (!__name__) {
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Py_DECREF(op);
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return NULL;
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}
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}
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module = PyDict_GetItem(globals, __name__);
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if (module) {
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Py_INCREF(module);
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op->func_module = module;
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}
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}
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else
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return NULL;
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_PyObject_GC_TRACK(op);
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return (PyObject *)op;
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}
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PyObject *
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PyFunction_GetCode(PyObject *op)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyFunctionObject *) op) -> func_code;
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}
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PyObject *
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PyFunction_GetGlobals(PyObject *op)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyFunctionObject *) op) -> func_globals;
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}
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PyObject *
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PyFunction_GetModule(PyObject *op)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyFunctionObject *) op) -> func_module;
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}
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PyObject *
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PyFunction_GetDefaults(PyObject *op)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyFunctionObject *) op) -> func_defaults;
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}
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int
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PyFunction_SetDefaults(PyObject *op, PyObject *defaults)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return -1;
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}
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if (defaults == Py_None)
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defaults = NULL;
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else if (PyTuple_Check(defaults)) {
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Py_XINCREF(defaults);
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}
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else {
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PyErr_SetString(PyExc_SystemError, "non-tuple default args");
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return -1;
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}
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Py_XDECREF(((PyFunctionObject *) op) -> func_defaults);
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((PyFunctionObject *) op) -> func_defaults = defaults;
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return 0;
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}
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PyObject *
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PyFunction_GetClosure(PyObject *op)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyFunctionObject *) op) -> func_closure;
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}
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int
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PyFunction_SetClosure(PyObject *op, PyObject *closure)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return -1;
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}
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if (closure == Py_None)
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closure = NULL;
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else if (PyTuple_Check(closure)) {
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Py_XINCREF(closure);
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}
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else {
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PyErr_Format(PyExc_SystemError,
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"expected tuple for closure, got '%.100s'",
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closure->ob_type->tp_name);
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return -1;
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}
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Py_XDECREF(((PyFunctionObject *) op) -> func_closure);
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((PyFunctionObject *) op) -> func_closure = closure;
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return 0;
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}
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/* Methods */
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#define OFF(x) offsetof(PyFunctionObject, x)
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static PyMemberDef func_memberlist[] = {
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{"func_closure", T_OBJECT, OFF(func_closure),
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RESTRICTED|READONLY},
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{"func_doc", T_OBJECT, OFF(func_doc), WRITE_RESTRICTED},
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{"__doc__", T_OBJECT, OFF(func_doc), WRITE_RESTRICTED},
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{"func_globals", T_OBJECT, OFF(func_globals),
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RESTRICTED|READONLY},
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{"__module__", T_OBJECT, OFF(func_module), WRITE_RESTRICTED},
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{NULL} /* Sentinel */
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};
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static int
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restricted(void)
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{
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if (!PyEval_GetRestricted())
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return 0;
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PyErr_SetString(PyExc_RuntimeError,
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"function attributes not accessible in restricted mode");
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return 1;
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}
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static PyObject *
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func_get_dict(PyFunctionObject *op)
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{
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if (restricted())
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return NULL;
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if (op->func_dict == NULL) {
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op->func_dict = PyDict_New();
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if (op->func_dict == NULL)
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return NULL;
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}
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Py_INCREF(op->func_dict);
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return op->func_dict;
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}
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static int
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func_set_dict(PyFunctionObject *op, PyObject *value)
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{
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PyObject *tmp;
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if (restricted())
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return -1;
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/* It is illegal to del f.func_dict */
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if (value == NULL) {
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PyErr_SetString(PyExc_TypeError,
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"function's dictionary may not be deleted");
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return -1;
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}
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/* Can only set func_dict to a dictionary */
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if (!PyDict_Check(value)) {
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PyErr_SetString(PyExc_TypeError,
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"setting function's dictionary to a non-dict");
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return -1;
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}
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tmp = op->func_dict;
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Py_INCREF(value);
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op->func_dict = value;
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Py_XDECREF(tmp);
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return 0;
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}
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static PyObject *
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func_get_code(PyFunctionObject *op)
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{
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if (restricted())
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return NULL;
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Py_INCREF(op->func_code);
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return op->func_code;
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}
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static int
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func_set_code(PyFunctionObject *op, PyObject *value)
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{
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PyObject *tmp;
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int nfree, nclosure;
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if (restricted())
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return -1;
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/* Not legal to del f.func_code or to set it to anything
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* other than a code object. */
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if (value == NULL || !PyCode_Check(value)) {
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PyErr_SetString(PyExc_TypeError,
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"func_code must be set to a code object");
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return -1;
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}
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nfree = PyCode_GetNumFree((PyCodeObject *)value);
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nclosure = (op->func_closure == NULL ? 0 :
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PyTuple_GET_SIZE(op->func_closure));
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if (nclosure != nfree) {
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PyErr_Format(PyExc_ValueError,
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"%s() requires a code object with %d free vars,"
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" not %d",
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PyString_AsString(op->func_name),
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nclosure, nfree);
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return -1;
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}
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tmp = op->func_code;
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Py_INCREF(value);
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op->func_code = value;
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Py_DECREF(tmp);
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return 0;
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}
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static PyObject *
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func_get_name(PyFunctionObject *op)
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{
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Py_INCREF(op->func_name);
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return op->func_name;
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}
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static int
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func_set_name(PyFunctionObject *op, PyObject *value)
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{
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PyObject *tmp;
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if (restricted())
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return -1;
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/* Not legal to del f.func_name or to set it to anything
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* other than a string object. */
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if (value == NULL || !PyString_Check(value)) {
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PyErr_SetString(PyExc_TypeError,
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"func_name must be set to a string object");
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return -1;
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}
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tmp = op->func_name;
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Py_INCREF(value);
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op->func_name = value;
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Py_DECREF(tmp);
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return 0;
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}
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static PyObject *
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func_get_defaults(PyFunctionObject *op)
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{
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if (restricted())
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return NULL;
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if (op->func_defaults == NULL) {
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Py_INCREF(Py_None);
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return Py_None;
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}
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Py_INCREF(op->func_defaults);
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return op->func_defaults;
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}
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static int
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func_set_defaults(PyFunctionObject *op, PyObject *value)
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{
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PyObject *tmp;
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if (restricted())
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return -1;
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/* Legal to del f.func_defaults.
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* Can only set func_defaults to NULL or a tuple. */
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if (value == Py_None)
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value = NULL;
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if (value != NULL && !PyTuple_Check(value)) {
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PyErr_SetString(PyExc_TypeError,
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"func_defaults must be set to a tuple object");
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return -1;
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}
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tmp = op->func_defaults;
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Py_XINCREF(value);
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op->func_defaults = value;
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Py_XDECREF(tmp);
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return 0;
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}
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static PyGetSetDef func_getsetlist[] = {
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{"func_code", (getter)func_get_code, (setter)func_set_code},
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{"func_defaults", (getter)func_get_defaults,
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(setter)func_set_defaults},
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{"func_dict", (getter)func_get_dict, (setter)func_set_dict},
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{"__dict__", (getter)func_get_dict, (setter)func_set_dict},
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{"func_name", (getter)func_get_name, (setter)func_set_name},
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{"__name__", (getter)func_get_name, (setter)func_set_name},
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{NULL} /* Sentinel */
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};
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PyDoc_STRVAR(func_doc,
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"function(code, globals[, name[, argdefs[, closure]]])\n\
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\n\
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Create a function object from a code object and a dictionary.\n\
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The optional name string overrides the name from the code object.\n\
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The optional argdefs tuple specifies the default argument values.\n\
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The optional closure tuple supplies the bindings for free variables.");
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/* func_new() maintains the following invariants for closures. The
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closure must correspond to the free variables of the code object.
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if len(code.co_freevars) == 0:
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closure = NULL
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else:
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len(closure) == len(code.co_freevars)
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for every elt in closure, type(elt) == cell
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*/
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static PyObject *
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func_new(PyTypeObject* type, PyObject* args, PyObject* kw)
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{
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PyCodeObject *code;
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PyObject *globals;
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PyObject *name = Py_None;
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PyObject *defaults = Py_None;
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PyObject *closure = Py_None;
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PyFunctionObject *newfunc;
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int nfree, nclosure;
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static const char *kwlist[] = {"code", "globals", "name",
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"argdefs", "closure", 0};
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if (!PyArg_ParseTupleAndKeywords(args, kw, "O!O!|OOO:function",
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kwlist,
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&PyCode_Type, &code,
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&PyDict_Type, &globals,
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&name, &defaults, &closure))
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return NULL;
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if (name != Py_None && !PyString_Check(name)) {
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PyErr_SetString(PyExc_TypeError,
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"arg 3 (name) must be None or string");
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return NULL;
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}
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if (defaults != Py_None && !PyTuple_Check(defaults)) {
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PyErr_SetString(PyExc_TypeError,
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"arg 4 (defaults) must be None or tuple");
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return NULL;
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}
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nfree = PyTuple_GET_SIZE(code->co_freevars);
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if (!PyTuple_Check(closure)) {
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if (nfree && closure == Py_None) {
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PyErr_SetString(PyExc_TypeError,
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"arg 5 (closure) must be tuple");
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return NULL;
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}
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else if (closure != Py_None) {
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PyErr_SetString(PyExc_TypeError,
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"arg 5 (closure) must be None or tuple");
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return NULL;
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}
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}
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/* check that the closure is well-formed */
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nclosure = closure == Py_None ? 0 : PyTuple_GET_SIZE(closure);
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if (nfree != nclosure)
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return PyErr_Format(PyExc_ValueError,
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"%s requires closure of length %d, not %d",
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PyString_AS_STRING(code->co_name),
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nfree, nclosure);
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if (nclosure) {
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int i;
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for (i = 0; i < nclosure; i++) {
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PyObject *o = PyTuple_GET_ITEM(closure, i);
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if (!PyCell_Check(o)) {
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return PyErr_Format(PyExc_TypeError,
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"arg 5 (closure) expected cell, found %s",
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o->ob_type->tp_name);
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}
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}
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}
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newfunc = (PyFunctionObject *)PyFunction_New((PyObject *)code,
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globals);
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if (newfunc == NULL)
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return NULL;
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if (name != Py_None) {
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Py_INCREF(name);
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Py_DECREF(newfunc->func_name);
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newfunc->func_name = name;
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}
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if (defaults != Py_None) {
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Py_INCREF(defaults);
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newfunc->func_defaults = defaults;
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}
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if (closure != Py_None) {
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Py_INCREF(closure);
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newfunc->func_closure = closure;
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}
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return (PyObject *)newfunc;
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}
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static void
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func_dealloc(PyFunctionObject *op)
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{
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_PyObject_GC_UNTRACK(op);
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if (op->func_weakreflist != NULL)
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PyObject_ClearWeakRefs((PyObject *) op);
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Py_DECREF(op->func_code);
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Py_DECREF(op->func_globals);
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Py_XDECREF(op->func_module);
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Py_DECREF(op->func_name);
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Py_XDECREF(op->func_defaults);
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Py_XDECREF(op->func_doc);
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Py_XDECREF(op->func_dict);
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Py_XDECREF(op->func_closure);
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PyObject_GC_Del(op);
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}
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static PyObject*
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func_repr(PyFunctionObject *op)
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{
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return PyString_FromFormat("<function %s at %p>",
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PyString_AsString(op->func_name),
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op);
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}
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static int
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func_traverse(PyFunctionObject *f, visitproc visit, void *arg)
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{
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int err;
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if (f->func_code) {
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err = visit(f->func_code, arg);
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if (err)
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return err;
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}
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if (f->func_globals) {
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err = visit(f->func_globals, arg);
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if (err)
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return err;
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}
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if (f->func_module) {
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err = visit(f->func_module, arg);
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if (err)
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return err;
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}
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if (f->func_defaults) {
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err = visit(f->func_defaults, arg);
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if (err)
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return err;
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}
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if (f->func_doc) {
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err = visit(f->func_doc, arg);
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if (err)
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return err;
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}
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if (f->func_name) {
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err = visit(f->func_name, arg);
|
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if (err)
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return err;
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}
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if (f->func_dict) {
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err = visit(f->func_dict, arg);
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if (err)
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return err;
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}
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if (f->func_closure) {
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err = visit(f->func_closure, arg);
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if (err)
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return err;
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}
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return 0;
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}
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|
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static PyObject *
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function_call(PyObject *func, PyObject *arg, PyObject *kw)
|
|
{
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PyObject *result;
|
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PyObject *argdefs;
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PyObject **d, **k;
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int nk, nd;
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argdefs = PyFunction_GET_DEFAULTS(func);
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if (argdefs != NULL && PyTuple_Check(argdefs)) {
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d = &PyTuple_GET_ITEM((PyTupleObject *)argdefs, 0);
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nd = PyTuple_Size(argdefs);
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}
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else {
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d = NULL;
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nd = 0;
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}
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|
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if (kw != NULL && PyDict_Check(kw)) {
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int pos, i;
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|
nk = PyDict_Size(kw);
|
|
k = PyMem_NEW(PyObject *, 2*nk);
|
|
if (k == NULL) {
|
|
PyErr_NoMemory();
|
|
return NULL;
|
|
}
|
|
pos = i = 0;
|
|
while (PyDict_Next(kw, &pos, &k[i], &k[i+1]))
|
|
i += 2;
|
|
nk = i/2;
|
|
/* XXX This is broken if the caller deletes dict items! */
|
|
}
|
|
else {
|
|
k = NULL;
|
|
nk = 0;
|
|
}
|
|
|
|
result = PyEval_EvalCodeEx(
|
|
(PyCodeObject *)PyFunction_GET_CODE(func),
|
|
PyFunction_GET_GLOBALS(func), (PyObject *)NULL,
|
|
&PyTuple_GET_ITEM(arg, 0), PyTuple_Size(arg),
|
|
k, nk, d, nd,
|
|
PyFunction_GET_CLOSURE(func));
|
|
|
|
if (k != NULL)
|
|
PyMem_DEL(k);
|
|
|
|
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;
|
|
return PyMethod_New(func, obj, type);
|
|
}
|
|
|
|
PyTypeObject PyFunction_Type = {
|
|
PyObject_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_compare */
|
|
(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;
|
|
} classmethod;
|
|
|
|
static void
|
|
cm_dealloc(classmethod *cm)
|
|
{
|
|
_PyObject_GC_UNTRACK((PyObject *)cm);
|
|
Py_XDECREF(cm->cm_callable);
|
|
cm->ob_type->tp_free((PyObject *)cm);
|
|
}
|
|
|
|
static int
|
|
cm_traverse(classmethod *cm, visitproc visit, void *arg)
|
|
{
|
|
if (!cm->cm_callable)
|
|
return 0;
|
|
return visit(cm->cm_callable, arg);
|
|
}
|
|
|
|
static int
|
|
cm_clear(classmethod *cm)
|
|
{
|
|
Py_XDECREF(cm->cm_callable);
|
|
cm->cm_callable = NULL;
|
|
|
|
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 *)(obj->ob_type);
|
|
return PyMethod_New(cm->cm_callable,
|
|
type, (PyObject *)(type->ob_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 (!PyCallable_Check(callable)) {
|
|
PyErr_Format(PyExc_TypeError, "'%s' object is not callable",
|
|
callable->ob_type->tp_name);
|
|
return -1;
|
|
}
|
|
|
|
Py_INCREF(callable);
|
|
cm->cm_callable = callable;
|
|
return 0;
|
|
}
|
|
|
|
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 = {
|
|
PyObject_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_compare */
|
|
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 */
|
|
0, /* tp_members */
|
|
0, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
cm_descr_get, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
0, /* 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;
|
|
} staticmethod;
|
|
|
|
static void
|
|
sm_dealloc(staticmethod *sm)
|
|
{
|
|
_PyObject_GC_UNTRACK((PyObject *)sm);
|
|
Py_XDECREF(sm->sm_callable);
|
|
sm->ob_type->tp_free((PyObject *)sm);
|
|
}
|
|
|
|
static int
|
|
sm_traverse(staticmethod *sm, visitproc visit, void *arg)
|
|
{
|
|
if (!sm->sm_callable)
|
|
return 0;
|
|
return visit(sm->sm_callable, arg);
|
|
}
|
|
|
|
static int
|
|
sm_clear(staticmethod *sm)
|
|
{
|
|
Py_XDECREF(sm->sm_callable);
|
|
sm->sm_callable = NULL;
|
|
|
|
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;
|
|
Py_INCREF(callable);
|
|
sm->sm_callable = callable;
|
|
return 0;
|
|
}
|
|
|
|
PyDoc_STRVAR(staticmethod_doc,
|
|
"staticmethod(function) -> method\n\
|
|
\n\
|
|
Convert a function to be a static method.\n\
|
|
\n\
|
|
A static method does not receive an implicit first argument.\n\
|
|
To declare a static method, use this idiom:\n\
|
|
\n\
|
|
class C:\n\
|
|
def f(arg1, arg2, ...): ...\n\
|
|
f = staticmethod(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\
|
|
\n\
|
|
Static methods in Python are similar to those found in Java or C++.\n\
|
|
For a more advanced concept, see the classmethod builtin.");
|
|
|
|
PyTypeObject PyStaticMethod_Type = {
|
|
PyObject_HEAD_INIT(&PyType_Type)
|
|
0,
|
|
"staticmethod",
|
|
sizeof(staticmethod),
|
|
0,
|
|
(destructor)sm_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_compare */
|
|
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,
|
|
staticmethod_doc, /* tp_doc */
|
|
(traverseproc)sm_traverse, /* tp_traverse */
|
|
(inquiry)sm_clear, /* 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 */
|
|
sm_descr_get, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
0, /* tp_dictoffset */
|
|
sm_init, /* tp_init */
|
|
PyType_GenericAlloc, /* tp_alloc */
|
|
PyType_GenericNew, /* tp_new */
|
|
PyObject_GC_Del, /* tp_free */
|
|
};
|
|
|
|
PyObject *
|
|
PyStaticMethod_New(PyObject *callable)
|
|
{
|
|
staticmethod *sm = (staticmethod *)
|
|
PyType_GenericAlloc(&PyStaticMethod_Type, 0);
|
|
if (sm != NULL) {
|
|
Py_INCREF(callable);
|
|
sm->sm_callable = callable;
|
|
}
|
|
return (PyObject *)sm;
|
|
}
|