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extmod/moductypes: Make sizeof() accept "layout" parameter.

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sizeof() can work in two ways: a) calculate size of already instantiated
structure ("sizeof variable") - in this case we already no layout; b) size
of structure decsription ("sizeof type"). In the latter case, LAYOUT_NATIVE
was assumed, but there should possibility to calculate size for other
layouts too. So, with this patch, there're now 2 forms:

uctypes.sizeof(struct)
uctypes.sizeof(struct_desc, layout)
This commit is contained in:
Paul Sokolovsky 2018-08-26 01:55:43 +03:00 committed by Damien George
parent 454cca6016
commit 2411f42ccb
1 changed files with 10 additions and 2 deletions
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12
extmod/moductypes.c
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@ -269,7 +269,8 @@ STATIC mp_uint_t uctypes_struct_size(mp_obj_t desc_in, int layout_type, mp_uint_
return total_size;
}
STATIC mp_obj_t uctypes_struct_sizeof(mp_obj_t obj_in) {
STATIC mp_obj_t uctypes_struct_sizeof(size_t n_args, const mp_obj_t *args) {
mp_obj_t obj_in = args[0];
mp_uint_t max_field_size = 0;
if (MP_OBJ_IS_TYPE(obj_in, &mp_type_bytearray)) {
return mp_obj_len(obj_in);
@ -278,15 +279,22 @@ STATIC mp_obj_t uctypes_struct_sizeof(mp_obj_t obj_in) {
// We can apply sizeof either to structure definition (a dict)
// or to instantiated structure
if (MP_OBJ_IS_TYPE(obj_in, &uctypes_struct_type)) {
if (n_args != 1) {
mp_raise_TypeError(NULL);
}
// Extract structure definition
mp_obj_uctypes_struct_t *obj = MP_OBJ_TO_PTR(obj_in);
obj_in = obj->desc;
layout_type = obj->flags;
} else {
if (n_args == 2) {
layout_type = mp_obj_get_int(args[1]);
}
}
mp_uint_t size = uctypes_struct_size(obj_in, layout_type, &max_field_size);
return MP_OBJ_NEW_SMALL_INT(size);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(uctypes_struct_sizeof_obj, uctypes_struct_sizeof);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(uctypes_struct_sizeof_obj, 1, 2, uctypes_struct_sizeof);
static inline mp_obj_t get_unaligned(uint val_type, byte *p, int big_endian) {
char struct_type = big_endian ? '>' : '<';