circuitpython/py/objinstance.c

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#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "mpqstr.h"
#include "obj.h"
#include "runtime.h"
#include "map.h"
typedef struct _mp_obj_instance_t {
mp_obj_base_t base;
mp_obj_base_t *class; // points to a "class" object
mp_map_t *members;
} mp_obj_instance_t;
/*
type needs to be specified dynamically
case O_OBJ:
{
py_map_elem_t *qn = py_qstr_map_lookup(o->u_obj.class->u_class.locals, qstr_from_str_static("__qualname__"), false); assert(qn != NULL);
assert(IS_O(qn->value, O_STR));
return qstr_str(((py_obj_base_t*)qn->value)->u_str);
}
*/
mp_obj_t mp_obj_instance_load_attr(mp_obj_t self_in, qstr attr) {
// logic: look in obj members then class locals (TODO check this against CPython)
mp_obj_instance_t *self = self_in;
mp_map_elem_t *elem = mp_map_lookup(self->members, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);
if (elem != NULL) {
// object member, always treated as a value
return elem->value;
}
elem = mp_map_lookup(mp_obj_class_get_locals(self->class), MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);
if (elem != NULL) {
if (mp_obj_is_callable(elem->value)) {
// class member is callable so build a bound method
return mp_obj_new_bound_meth(self_in, elem->value);
} else {
// class member is a value, so just return that value
return elem->value;
}
}
nlr_jump(mp_obj_new_exception_msg_2_args(MP_QSTR_AttributeError, "'%s' object has no attribute '%s'", mp_obj_get_type_str(self_in), qstr_str(attr)));
}
void mp_obj_instance_load_method(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
// logic: look in obj members then class locals (TODO check this against CPython)
mp_obj_instance_t *self = self_in;
mp_map_elem_t *elem = mp_map_lookup(self->members, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);
if (elem != NULL) {
// object member, always treated as a value
dest[1] = elem->value;
dest[0] = NULL;
return;
}
elem = mp_map_lookup(mp_obj_class_get_locals(self->class), MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);
if (elem != NULL) {
if (mp_obj_is_callable(elem->value)) {
// class member is callable so build a bound method
dest[1] = elem->value;
dest[0] = self_in;
return;
} else {
// class member is a value, so just return that value
dest[1] = elem->value;
dest[0] = NULL;
return;
}
}
// no such method, so fall back to load attr
dest[1] = rt_load_attr(self_in, attr);
dest[0] = NULL;
}
void mp_obj_instance_store_attr(mp_obj_t self_in, qstr attr, mp_obj_t value) {
// logic: look in class locals (no add) then obj members (add) (TODO check this against CPython)
mp_obj_instance_t *self = self_in;
mp_map_elem_t *elem = mp_map_lookup(mp_obj_class_get_locals(self->class), MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);
if (elem != NULL) {
elem->value = value;
} else {
mp_map_lookup(self->members, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
}
}
const mp_obj_type_t instance_type = {
{ &mp_const_type },
"instance",
};
mp_obj_t mp_obj_new_instance(mp_obj_t class) {
mp_obj_instance_t *o = m_new_obj(mp_obj_instance_t);
o->base.type = &instance_type;
o->class = class;
o->members = mp_map_new(0);
return o;
}