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py/objtype: Add __dict__ attribute for class objects.

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The behavior mirrors the instance object dict attribute where a copy of the
local attributes are provided (unless the dict is read-only, then that dict
itself is returned, as an optimisation).  MicroPython does not support
modifying this dict because the changes will not be reflected in the class.

The feature is only enabled if MICROPY_CPYTHON_COMPAT is set, the same as
the instance version.
This commit is contained in:
Andrew Leech
2020-06-10 10:45:24 +10:00
committed by Damien George
parent 29e258611a
commit 28370c0450
4 changed files with 37 additions and 2 deletions
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15
py/objtype.c
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@@ -1013,6 +1013,21 @@ STATIC void type_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
dest[0] = MP_OBJ_NEW_QSTR(self->name);
return;
}
#if MICROPY_CPYTHON_COMPAT
if (attr == MP_QSTR___dict__) {
// Returns a read-only dict of the class attributes.
// If the internal locals is not fixed, a copy will be created.
mp_obj_dict_t *dict = self->locals_dict;
if (dict->map.is_fixed) {
dest[0] = MP_OBJ_FROM_PTR(dict);
} else {
dest[0] = mp_obj_dict_copy(MP_OBJ_FROM_PTR(dict));
dict = MP_OBJ_TO_PTR(dest[0]);
dict->map.is_fixed = 1;
}
return;
}
#endif
if (attr == MP_QSTR___bases__) {
if (self == &mp_type_object) {
dest[0] = mp_const_empty_tuple;