700 lines
16 KiB
C
700 lines
16 KiB
C
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/* Function object implementation */
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#include "Python.h"
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#include "compile.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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if (op != NULL) {
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PyObject *doc;
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PyObject *consts;
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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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}
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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_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_SetString(PyExc_SystemError, "non-tuple closure");
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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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#define RR ()
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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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{"func_name", T_OBJECT, OFF(func_name), READONLY},
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{"__name__", T_OBJECT, OFF(func_name), READONLY},
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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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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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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_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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{NULL} /* Sentinel */
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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_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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if (op->func_name == Py_None)
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return PyString_FromFormat("<anonymous function at %p>", op);
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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_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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static PyObject *
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function_call(PyObject *func, PyObject *arg, PyObject *kw)
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{
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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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if (kw != NULL && PyDict_Check(kw)) {
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int pos, i;
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nk = PyDict_Size(kw);
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k = PyMem_NEW(PyObject *, 2*nk);
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if (k == NULL) {
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PyErr_NoMemory();
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return NULL;
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}
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pos = i = 0;
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while (PyDict_Next(kw, &pos, &k[i], &k[i+1]))
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i += 2;
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nk = i/2;
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/* XXX This is broken if the caller deletes dict items! */
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}
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else {
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k = NULL;
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nk = 0;
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}
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result = PyEval_EvalCodeEx(
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(PyCodeObject *)PyFunction_GET_CODE(func),
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PyFunction_GET_GLOBALS(func), (PyObject *)NULL,
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&PyTuple_GET_ITEM(arg, 0), PyTuple_Size(arg),
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k, nk, d, nd,
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PyFunction_GET_CLOSURE(func));
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if (k != NULL)
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PyMem_DEL(k);
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return result;
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}
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/* Bind a function to an object */
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static PyObject *
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func_descr_get(PyObject *func, PyObject *obj, PyObject *type)
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{
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if (obj == Py_None)
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obj = NULL;
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return PyMethod_New(func, obj, type);
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}
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PyTypeObject PyFunction_Type = {
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PyObject_HEAD_INIT(&PyType_Type)
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0,
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"function",
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sizeof(PyFunctionObject),
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0,
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(destructor)func_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_compare */
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(reprfunc)func_repr, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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function_call, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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PyObject_GenericSetAttr, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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0, /* tp_doc */
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(traverseproc)func_traverse, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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offsetof(PyFunctionObject, func_weakreflist), /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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func_memberlist, /* tp_members */
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func_getsetlist, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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func_descr_get, /* tp_descr_get */
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0, /* tp_descr_set */
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offsetof(PyFunctionObject, func_dict), /* tp_dictoffset */
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};
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/* Class method object */
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/* A class method receives the class as implicit first argument,
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just like an instance method receives the instance.
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To declare a class method, use this idiom:
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class C:
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def f(cls, arg1, arg2, ...): ...
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f = classmethod(f)
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It can be called either on the class (e.g. C.f()) or on an instance
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(e.g. C().f()); the instance is ignored except for its class.
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If a class method is called for a derived class, the derived class
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object is passed as the implied first argument.
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Class methods are different than C++ or Java static methods.
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If you want those, see static methods below.
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*/
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typedef struct {
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PyObject_HEAD
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PyObject *cm_callable;
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} classmethod;
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static void
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cm_dealloc(classmethod *cm)
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{
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Py_XDECREF(cm->cm_callable);
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cm->ob_type->tp_free((PyObject *)cm);
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}
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static PyObject *
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cm_descr_get(PyObject *self, PyObject *obj, PyObject *type)
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{
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classmethod *cm = (classmethod *)self;
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if (cm->cm_callable == NULL) {
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PyErr_SetString(PyExc_RuntimeError,
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"uninitialized classmethod object");
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return NULL;
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}
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if (type == NULL)
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type = (PyObject *)(obj->ob_type);
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return PyMethod_New(cm->cm_callable,
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type, (PyObject *)(type->ob_type));
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}
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static int
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cm_init(PyObject *self, PyObject *args, PyObject *kwds)
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{
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classmethod *cm = (classmethod *)self;
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PyObject *callable;
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if (!PyArg_ParseTuple(args, "O:callable", &callable))
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return -1;
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Py_INCREF(callable);
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cm->cm_callable = callable;
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return 0;
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}
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static char classmethod_doc[] =
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"classmethod(function) -> method\n\
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\n\
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Convert a function to be a class method.\n\
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\n\
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A class method receives the class as implicit first argument,\n\
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just like an instance method receives the instance.\n\
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To declare a class method, use this idiom:\n\
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\n\
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class C:\n\
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def f(cls, arg1, arg2, ...): ...\n\
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f = classmethod(f)\n\
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\n\
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It can be called either on the class (e.g. C.f()) or on an instance\n\
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(e.g. C().f()). The instance is ignored except for its class.\n\
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If a class method is called for a derived class, the derived class\n\
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object is passed as the implied first argument.\n\
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\n\
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Class methods are different than C++ or Java static methods.\n\
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If you want those, see the staticmethod builtin.";
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PyTypeObject PyClassMethod_Type = {
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PyObject_HEAD_INIT(&PyType_Type)
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0,
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"classmethod",
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sizeof(classmethod),
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0,
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(destructor)cm_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_compare */
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0, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
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classmethod_doc, /* tp_doc */
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0, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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|
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_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)
|
|
{
|
|
Py_XDECREF(sm->sm_callable);
|
|
sm->ob_type->tp_free((PyObject *)sm);
|
|
}
|
|
|
|
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_ParseTuple(args, "O:callable", &callable))
|
|
return -1;
|
|
Py_INCREF(callable);
|
|
sm->sm_callable = callable;
|
|
return 0;
|
|
}
|
|
|
|
static char 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, /* tp_flags */
|
|
staticmethod_doc, /* tp_doc */
|
|
0, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
0, /* tp_members */
|
|
0, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
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_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;
|
|
}
|