djsundog
/
circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

extmod/moductypes: sizeof operation depends on layout type of structure. 

Previously, sizeof() blindly assumed LAYOUT_NATIVE and tried to align
size even for packed LAYOUT_LITTLE_ENDIAN & LAYOUT_BIG_ENDIAN. As sizeof()
is implemented on a strucuture descriptor dictionary (not an structure
object), resolving this required passing layout type around.
This commit is contained in:
Paul Sokolovsky 2015-12-09 21:39:36 +02:00
parent 5a4a2b1db3
commit d4a874b81e
1 changed files with 17 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
extmod/moductypes.c
View File

@ -155,7 +155,7 @@ STATIC void uctypes_struct_print(const mp_print_t *print, mp_obj_t self_in, mp_p
}
// Get size of any type descriptor
STATIC mp_uint_t uctypes_struct_size(mp_obj_t desc_in, mp_uint_t *max_field_size);
STATIC mp_uint_t uctypes_struct_size(mp_obj_t desc_in, int layout_type, mp_uint_t *max_field_size);
// Get size of scalar type descriptor
static inline mp_uint_t uctypes_struct_scalar_size(int val_type) {
@ -167,7 +167,7 @@ static inline mp_uint_t uctypes_struct_scalar_size(int val_type) {
}
// Get size of aggregate type descriptor
STATIC mp_uint_t uctypes_struct_agg_size(mp_obj_tuple_t *t, mp_uint_t *max_field_size) {
STATIC mp_uint_t uctypes_struct_agg_size(mp_obj_tuple_t *t, int layout_type, mp_uint_t *max_field_size) {
mp_uint_t total_size = 0;
mp_int_t offset_ = MP_OBJ_SMALL_INT_VALUE(t->items[0]);
@ -175,7 +175,7 @@ STATIC mp_uint_t uctypes_struct_agg_size(mp_obj_tuple_t *t, mp_uint_t *max_field
switch (agg_type) {
case STRUCT:
return uctypes_struct_size(t->items[1], max_field_size);
return uctypes_struct_size(t->items[1], layout_type, max_field_size);
case PTR:
if (sizeof(void*) > *max_field_size) {
*max_field_size = sizeof(void*);
@ -194,7 +194,7 @@ STATIC mp_uint_t uctypes_struct_agg_size(mp_obj_tuple_t *t, mp_uint_t *max_field
}
} else {
// Elements of array are aggregates
item_s = uctypes_struct_size(t->items[2], max_field_size);
item_s = uctypes_struct_size(t->items[2], layout_type, max_field_size);
}
return item_s * arr_sz;
@ -206,10 +206,10 @@ STATIC mp_uint_t uctypes_struct_agg_size(mp_obj_tuple_t *t, mp_uint_t *max_field
return total_size;
}
STATIC mp_uint_t uctypes_struct_size(mp_obj_t desc_in, mp_uint_t *max_field_size) {
STATIC mp_uint_t uctypes_struct_size(mp_obj_t desc_in, int layout_type, mp_uint_t *max_field_size) {
if (!MP_OBJ_IS_TYPE(desc_in, &mp_type_dict)) {
if (MP_OBJ_IS_TYPE(desc_in, &mp_type_tuple)) {
return uctypes_struct_agg_size((mp_obj_tuple_t*)MP_OBJ_TO_PTR(desc_in), max_field_size);
return uctypes_struct_agg_size((mp_obj_tuple_t*)MP_OBJ_TO_PTR(desc_in), layout_type, max_field_size);
} else if (MP_OBJ_IS_SMALL_INT(desc_in)) {
// We allow sizeof on both type definitions and structures/structure fields,
// but scalar structure field is lowered into native Python int, so all
@ -244,7 +244,7 @@ STATIC mp_uint_t uctypes_struct_size(mp_obj_t desc_in, mp_uint_t *max_field_size
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(v);
mp_int_t offset = MP_OBJ_SMALL_INT_VALUE(t->items[0]);
offset &= VALUE_MASK(AGG_TYPE_BITS);
mp_uint_t s = uctypes_struct_agg_size(t, max_field_size);
mp_uint_t s = uctypes_struct_agg_size(t, layout_type, max_field_size);
if (offset + s > total_size) {
total_size = offset + s;
}
@ -253,7 +253,9 @@ STATIC mp_uint_t uctypes_struct_size(mp_obj_t desc_in, mp_uint_t *max_field_size
}
// Round size up to alignment of biggest field
total_size = (total_size + *max_field_size - 1) & ~(*max_field_size - 1);
if (layout_type == LAYOUT_NATIVE) {
total_size = (total_size + *max_field_size - 1) & ~(*max_field_size - 1);
}
return total_size;
}
@ -262,14 +264,16 @@ STATIC mp_obj_t uctypes_struct_sizeof(mp_obj_t obj_in) {
if (MP_OBJ_IS_TYPE(obj_in, &mp_type_bytearray)) {
return mp_obj_len(obj_in);
}
int layout_type = LAYOUT_NATIVE;
// We can apply sizeof either to structure definition (a dict)
// or to instantiated structure
if (MP_OBJ_IS_TYPE(obj_in, &uctypes_struct_type)) {
// Extract structure definition
mp_obj_uctypes_struct_t *obj = MP_OBJ_TO_PTR(obj_in);
obj_in = obj->desc;
layout_type = obj->flags;
}
mp_uint_t size = uctypes_struct_size(obj_in, &max_field_size);
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);
@ -470,7 +474,7 @@ STATIC mp_obj_t uctypes_struct_attr_op(mp_obj_t self_in, qstr attr, mp_obj_t set
case ARRAY: {
mp_uint_t dummy;
if (IS_SCALAR_ARRAY(sub) && IS_SCALAR_ARRAY_OF_BYTES(sub)) {
return mp_obj_new_bytearray_by_ref(uctypes_struct_agg_size(sub, &dummy), self->addr + offset);
return mp_obj_new_bytearray_by_ref(uctypes_struct_agg_size(sub, self->flags, &dummy), self->addr + offset);
}
// Fall thru to return uctypes struct object
}
@ -533,7 +537,7 @@ STATIC mp_obj_t uctypes_struct_subscr(mp_obj_t self_in, mp_obj_t index_in, mp_ob
return get_unaligned(val_type, p, self->flags);
} else {
mp_uint_t dummy = 0;
mp_uint_t size = uctypes_struct_size(t->items[2], &dummy);
mp_uint_t size = uctypes_struct_size(t->items[2], self->flags, &dummy);
mp_obj_uctypes_struct_t *o = m_new_obj(mp_obj_uctypes_struct_t);
o->base.type = &uctypes_struct_type;
o->desc = t->items[2];
@ -548,7 +552,7 @@ STATIC mp_obj_t uctypes_struct_subscr(mp_obj_t self_in, mp_obj_t index_in, mp_ob
return get_aligned(val_type, p, index);
} else {
mp_uint_t dummy = 0;
mp_uint_t size = uctypes_struct_size(t->items[1], &dummy);
mp_uint_t size = uctypes_struct_size(t->items[1], self->flags, &dummy);
mp_obj_uctypes_struct_t *o = m_new_obj(mp_obj_uctypes_struct_t);
o->base.type = &uctypes_struct_type;
o->desc = t->items[1];
@ -570,7 +574,7 @@ STATIC mp_int_t uctypes_get_buffer(mp_obj_t self_in, mp_buffer_info_t *bufinfo,
(void)flags;
mp_obj_uctypes_struct_t *self = MP_OBJ_TO_PTR(self_in);
mp_uint_t max_field_size = 0;
mp_uint_t size = uctypes_struct_size(self->desc, &max_field_size);
mp_uint_t size = uctypes_struct_size(self->desc, self->flags, &max_field_size);
bufinfo->buf = self->addr;
bufinfo->len = size;