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py/objtype: Optimise slot RAM usage for instance types.

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In all cases other than where you have a native base with a protocol, it
now fits into 4 GC blocks (like it did before the slots representation).

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
This commit is contained in:
Jim Mussared
2022-09-13 23:56:52 +10:00
committed by Damien George
parent cb0ffdd2bf
commit 165388e4eb
3 changed files with 22 additions and 15 deletions
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33
py/objtype.c
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@@ -1148,10 +1148,15 @@ mp_obj_t mp_obj_new_type(qstr name, mp_obj_t bases_tuple, mp_obj_t locals_dict)
#endif
}
// Allocate a full-sized mp_obj_full_type_t instance (i.e. all slots / extended fields).
// Given that Python types use almost all the slots anyway, this doesn't cost anything
// extra.
mp_obj_type_t *o = (mp_obj_type_t *)m_new0(mp_obj_full_type_t, 1);
const void *base_protocol = NULL;
if (bases_len > 0) {
base_protocol = MP_OBJ_TYPE_GET_SLOT_OR_NULL(((mp_obj_type_t *)MP_OBJ_TO_PTR(bases_items[0])), protocol);
}
// Allocate a variable-sized mp_obj_type_t with as many slots as we need
// (currently 9, plus 1 for base, plus 1 for base-protocol).
// Note: 11 slots pushes it from 4 to 5 GC blocks.
mp_obj_type_t *o = m_new_obj_var0(mp_obj_type_t, void *, 9 + (bases_len ? 1 : 0) + (base_protocol ? 1 : 0));
o->base.type = &mp_type_type;
o->flags = base_flags;
o->name = name;
@@ -1166,13 +1171,10 @@ mp_obj_t mp_obj_new_type(qstr name, mp_obj_t bases_tuple, mp_obj_t locals_dict)
// MP_OBJ_TYPE_SET_SLOT(o, iternext, not implemented)
MP_OBJ_TYPE_SET_SLOT(o, buffer, instance_get_buffer, 7);
if (bases_len > 0) {
// Inherit protocol from a base class. This allows to define an
// abstract base class which would translate C-level protocol to
// Python method calls, and any subclass inheriting from it will
// support this feature.
MP_OBJ_TYPE_SET_SLOT(o, protocol, MP_OBJ_TYPE_GET_SLOT_OR_NULL(((mp_obj_type_t *)MP_OBJ_TO_PTR(bases_items[0])), protocol), 8);
mp_obj_dict_t *locals_ptr = MP_OBJ_TO_PTR(locals_dict);
MP_OBJ_TYPE_SET_SLOT(o, locals_dict, locals_ptr, 8);
if (bases_len > 0) {
if (bases_len >= 2) {
#if MICROPY_MULTIPLE_INHERITANCE
MP_OBJ_TYPE_SET_SLOT(o, parent, MP_OBJ_TO_PTR(bases_tuple), 9);
@@ -1182,10 +1184,15 @@ mp_obj_t mp_obj_new_type(qstr name, mp_obj_t bases_tuple, mp_obj_t locals_dict)
} else {
MP_OBJ_TYPE_SET_SLOT(o, parent, MP_OBJ_TO_PTR(bases_items[0]), 9);
}
}
mp_obj_dict_t *locals_ptr = MP_OBJ_TO_PTR(locals_dict);
MP_OBJ_TYPE_SET_SLOT(o, locals_dict, locals_ptr, 10);
// Inherit protocol from a base class. This allows to define an
// abstract base class which would translate C-level protocol to
// Python method calls, and any subclass inheriting from it will
// support this feature.
if (base_protocol) {
MP_OBJ_TYPE_SET_SLOT(o, protocol, base_protocol, 10);
}
}
#if ENABLE_SPECIAL_ACCESSORS
// Check if the class has any special accessor methods