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Use __reduce_ex__.

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This commit is contained in:
Guido van Rossum 2003-02-19 01:45:13 +00:00
parent 9c9cf41a01
commit b289b87a37
1 changed files with 36 additions and 45 deletions
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81
Modules/cPickle.c
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@ -119,14 +119,9 @@ static PyObject *extension_cache;
/* For looking up name pairs in copy_reg._extension_registry. */
static PyObject *two_tuple;
/* object.__reduce__, the default reduce callable. */
static PyObject *object_reduce;
/* copy_reg._better_reduce, the protocol 2 reduction function. */
static PyObject *better_reduce;
static PyObject *__class___str, *__getinitargs___str, *__dict___str,
*__getstate___str, *__setstate___str, *__name___str, *__reduce___str,
*__reduce_ex___str,
*write_str, *append_str,
*read_str, *readline_str, *__main___str, *__basicnew___str,
*copy_reg_str, *dispatch_table_str;
@ -2505,48 +2500,50 @@ save(Picklerobject *self, PyObject *args, int pers_save)
goto finally;
}
/* Get a reduction callable. This may come from
* copy_reg.dispatch_table, the object's __reduce__ method,
* the default object.__reduce__, or copy_reg._better_reduce.
/* Get a reduction callable, and call it. This may come from
* copy_reg.dispatch_table, the object's __reduce_ex__ method,
* or the object's __reduce__ method.
*/
__reduce__ = PyDict_GetItem(dispatch_table, (PyObject *)type);
if (__reduce__ != NULL) {
Py_INCREF(__reduce__);
Py_INCREF(args);
ARG_TUP(self, args);
if (self->arg) {
t = PyObject_Call(__reduce__, self->arg, NULL);
FREE_ARG_TUP(self);
}
}
else {
/* Check for a __reduce__ method.
* Subtle: get the unbound method from the class, so that
* protocol 2 can override the default __reduce__ that all
* classes inherit from object.
* XXX object.__reduce__ should really be rewritten so that
* XXX we don't need to call back into Python code here
* XXX (better_reduce), but no time to do that.
*/
__reduce__ = PyObject_GetAttr((PyObject *)type,
__reduce___str);
if (__reduce__ == NULL) {
/* Check for a __reduce_ex__ method. */
__reduce__ = PyObject_GetAttr(args, __reduce_ex___str);
if (__reduce__ != NULL) {
t = PyInt_FromLong(self->proto);
if (t != NULL) {
ARG_TUP(self, t);
t = NULL;
if (self->arg) {
t = PyObject_Call(__reduce__,
self->arg, NULL);
FREE_ARG_TUP(self);
}
}
}
else {
PyErr_Clear();
PyErr_SetObject(UnpickleableError, args);
goto finally;
}
if (self->proto >= 2 && __reduce__ == object_reduce) {
/* Proto 2 can do better than the default. */
Py_DECREF(__reduce__);
Py_INCREF(better_reduce);
__reduce__ = better_reduce;
/* Check for a __reduce__ method. */
__reduce__ = PyObject_GetAttr(args, __reduce___str);
if (__reduce__ != NULL) {
t = PyObject_Call(__reduce__,
empty_tuple, NULL);
}
else {
PyErr_SetObject(UnpickleableError, args);
goto finally;
}
}
}
/* Call the reduction callable, setting t to the result. */
assert(__reduce__ != NULL);
assert(t == NULL);
Py_INCREF(args);
ARG_TUP(self, args);
if (self->arg) {
t = PyObject_Call(__reduce__, self->arg, NULL);
FREE_ARG_TUP(self);
}
if (t == NULL)
goto finally;
@ -5590,6 +5587,7 @@ init_stuff(PyObject *module_dict)
INIT_STR(__name__);
INIT_STR(__main__);
INIT_STR(__reduce__);
INIT_STR(__reduce_ex__);
INIT_STR(write);
INIT_STR(append);
INIT_STR(read);
@ -5618,15 +5616,8 @@ init_stuff(PyObject *module_dict)
"_extension_cache");
if (!extension_cache) return -1;
better_reduce = PyObject_GetAttrString(copy_reg, "_better_reduce");
if (!better_reduce) return -1;
Py_DECREF(copy_reg);
object_reduce = PyObject_GetAttrString((PyObject *)&PyBaseObject_Type,
"__reduce__");
if (object_reduce == NULL) return -1;
if (!(empty_tuple = PyTuple_New(0)))
return -1;