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Make function objects somewhat mutable -- the members func_code, 

func_defaults and func_doc (alias __doc__) may be assigned to.  For
the first two, there's a type restriction to code object and tuple,
respectively.
This commit is contained in:
Guido van Rossum 1998-05-22 00:55:34 +00:00
parent b1ed9c5295
commit 0dabacee16
1 changed files with 35 additions and 3 deletions
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38
Objects/funcobject.c
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@ -127,11 +127,11 @@ PyFunction_SetDefaults(op, defaults)
#define OFF(x) offsetof(PyFunctionObject, x) #define OFF(x) offsetof(PyFunctionObject, x)
static struct memberlist func_memberlist[] = { static struct memberlist func_memberlist[] = {
{"func_code", T_OBJECT, OFF(func_code), READONLY}, {"func_code", T_OBJECT, OFF(func_code)},
{"func_globals",T_OBJECT, OFF(func_globals), READONLY}, {"func_globals",T_OBJECT, OFF(func_globals), READONLY},
{"func_name", T_OBJECT, OFF(func_name), READONLY}, {"func_name", T_OBJECT, OFF(func_name), READONLY},
{"__name__", T_OBJECT, OFF(func_name), READONLY}, {"__name__", T_OBJECT, OFF(func_name), READONLY},
{"func_defaults",T_OBJECT, OFF(func_defaults), READONLY}, {"func_defaults",T_OBJECT, OFF(func_defaults)},
{"func_doc", T_OBJECT, OFF(func_doc)}, {"func_doc", T_OBJECT, OFF(func_doc)},
{"__doc__", T_OBJECT, OFF(func_doc)}, {"__doc__", T_OBJECT, OFF(func_doc)},
{NULL} /* Sentinel */ {NULL} /* Sentinel */
@ -150,6 +150,38 @@ func_getattr(op, name)
return PyMember_Get((char *)op, func_memberlist, name); return PyMember_Get((char *)op, func_memberlist, name);
} }
static int
func_setattr(op, name, value)
PyFunctionObject *op;
char *name;
PyObject *value;
{
if (PyEval_GetRestricted()) {
PyErr_SetString(PyExc_RuntimeError,
"function attributes not settable in restricted mode");
return -1;
}
if (strcmp(name, "func_code") == 0) {
if (value == NULL || !PyCode_Check(value)) {
PyErr_SetString(
PyExc_TypeError,
"func_code must be set to a code object");
return -1;
}
}
else if (strcmp(name, "func_defaults") == 0) {
if (value != Py_None && !PyTuple_Check(value)) {
PyErr_SetString(
PyExc_TypeError,
"func_defaults must be set to a tuple object");
return -1;
}
if (value == Py_None)
value = NULL;
}
return PyMember_Set((char *)op, func_memberlist, name, value);
}
static void static void
func_dealloc(op) func_dealloc(op)
PyFunctionObject *op; PyFunctionObject *op;
@ -216,7 +248,7 @@ PyTypeObject PyFunction_Type = {
(destructor)func_dealloc, /*tp_dealloc*/ (destructor)func_dealloc, /*tp_dealloc*/
0, /*tp_print*/ 0, /*tp_print*/
(getattrfunc)func_getattr, /*tp_getattr*/ (getattrfunc)func_getattr, /*tp_getattr*/
0, /*tp_setattr*/ (setattrfunc)func_setattr, /*tp_setattr*/
(cmpfunc)func_compare, /*tp_compare*/ (cmpfunc)func_compare, /*tp_compare*/
(reprfunc)func_repr, /*tp_repr*/ (reprfunc)func_repr, /*tp_repr*/
0, /*tp_as_number*/ 0, /*tp_as_number*/