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Change PyType_Ready() to use the READY and READYING flags. This makes

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it possible to detect recursive calls early (as opposed to when the
stack overflows :-).
This commit is contained in:
Guido van Rossum 2001-08-10 17:39:49 +00:00
parent d635e3c468
commit d614f97733
1 changed files with 26 additions and 13 deletions
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39
Objects/typeobject.c
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@ -1169,8 +1169,14 @@ PyType_Ready(PyTypeObject *type)
PyTypeObject *base;
int i, n;
if (type->tp_dict != NULL)
return 0; /* Already initialized */
if (type->tp_flags & Py_TPFLAGS_READY) {
assert(type->tp_dict != NULL);
return 0;
}
assert((type->tp_flags & Py_TPFLAGS_READYING) == 0);
assert(type->tp_dict == NULL);
type->tp_flags |= Py_TPFLAGS_READYING;
/* Initialize tp_base (defaults to BaseObject unless that's us) */
base = type->tp_base;
@ -1185,14 +1191,14 @@ PyType_Ready(PyTypeObject *type)
else
bases = Py_BuildValue("(O)", base);
if (bases == NULL)
return -1;
goto error;
type->tp_bases = bases;
}
/* Initialize the base class */
if (base && base->tp_dict == NULL) {
if (PyType_Ready(base) < 0)
return -1;
goto error;
}
/* Initialize tp_defined */
@ -1200,24 +1206,24 @@ PyType_Ready(PyTypeObject *type)
if (dict == NULL) {
dict = PyDict_New();
if (dict == NULL)
return -1;
goto error;
type->tp_defined = dict;
}
/* Add type-specific descriptors to tp_defined */
if (add_operators(type) < 0)
return -1;
goto error;
if (type->tp_methods != NULL) {
if (add_methods(type, type->tp_methods) < 0)
return -1;
goto error;
}
if (type->tp_members != NULL) {
if (add_members(type, type->tp_members) < 0)
return -1;
goto error;
}
if (type->tp_getset != NULL) {
if (add_getset(type, type->tp_getset) < 0)
return -1;
goto error;
}
/* Temporarily make tp_dict the same object as tp_defined.
@ -1228,7 +1234,7 @@ PyType_Ready(PyTypeObject *type)
/* Calculate method resolution order */
if (mro_internal(type) < 0) {
return -1;
goto error;
}
/* Initialize tp_dict properly */
@ -1240,7 +1246,7 @@ PyType_Ready(PyTypeObject *type)
Py_DECREF(type->tp_dict);
type->tp_dict = PyDict_New();
if (type->tp_dict == NULL)
return -1;
goto error;
bases = type->tp_mro;
assert(bases != NULL);
assert(PyTuple_Check(bases));
@ -1250,16 +1256,23 @@ PyType_Ready(PyTypeObject *type)
assert(PyType_Check(base));
x = base->tp_defined;
if (x != NULL && PyDict_Update(type->tp_dict, x) < 0)
return -1;
goto error;
}
}
/* Inherit slots from direct base */
if (type->tp_base != NULL)
if (inherit_slots(type, type->tp_base) < 0)
return -1;
goto error;
assert(type->tp_dict != NULL);
type->tp_flags =
(type->tp_flags & ~Py_TPFLAGS_READYING) | Py_TPFLAGS_READY;
return 0;
error:
type->tp_flags &= ~Py_TPFLAGS_READYING;
return -1;
}