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py: Refactor slice helpers, preparing to support arbitrary slicing.

This commit is contained in:
Paul Sokolovsky 2014-05-25 21:21:57 +03:00
parent ff4b6daa4f
commit de4b9329f9
6 changed files with 46 additions and 33 deletions
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10
py/obj.h
View File

@ -563,8 +563,16 @@ typedef struct _mp_obj_static_class_method_t {
const mp_obj_t *mp_obj_property_get(mp_obj_t self_in);
// sequence helpers
// slice indexes resolved to particular sequence
typedef struct {
machine_uint_t start;
machine_uint_t stop;
machine_int_t step;
} mp_bound_slice_t;
void mp_seq_multiply(const void *items, uint item_sz, uint len, uint times, void *dest);
bool mp_seq_get_fast_slice_indexes(machine_uint_t len, mp_obj_t slice, machine_uint_t *begin, machine_uint_t *end);
bool mp_seq_get_fast_slice_indexes(machine_uint_t len, mp_obj_t slice, mp_bound_slice_t *indexes);
#define mp_seq_copy(dest, src, len, item_t) memcpy(dest, src, len * sizeof(item_t))
#define mp_seq_cat(dest, src1, len1, src2, len2, item_t) { memcpy(dest, src1, (len1) * sizeof(item_t)); memcpy(dest + (len1), src2, (len2) * sizeof(item_t)); }
bool mp_seq_cmp_bytes(int op, const byte *data1, uint len1, const byte *data2, uint len2);

8
py/objarray.c
View File

@ -176,15 +176,15 @@ STATIC mp_obj_t array_subscr(mp_obj_t self_in, mp_obj_t index_in, mp_obj_t value
// slice assignment (incl. of different size)
return MP_OBJ_NULL; // op not supported
}
machine_uint_t start, stop;
if (!mp_seq_get_fast_slice_indexes(o->len, index_in, &start, &stop)) {
mp_bound_slice_t slice;
if (!mp_seq_get_fast_slice_indexes(o->len, index_in, &slice)) {
assert(0);
}
mp_obj_array_t *res = array_new(o->typecode, stop - start);
mp_obj_array_t *res = array_new(o->typecode, slice.stop - slice.start);
int sz = mp_binary_get_size('@', o->typecode, NULL);
assert(sz > 0);
byte *p = o->items;
memcpy(res->items, p + start * sz, (stop - start) * sz);
memcpy(res->items, p + slice.start * sz, (slice.stop - slice.start) * sz);
return res;
} else {
uint index = mp_get_index(o->base.type, o->len, index_in, false);

28
py/objlist.c
View File

@ -153,15 +153,15 @@ STATIC mp_obj_t list_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
#if MICROPY_PY_SLICE
if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
mp_obj_list_t *self = self_in;
machine_uint_t start, stop;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &start, &stop)) {
mp_bound_slice_t slice;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &slice)) {
assert(0);
}
int len_adj = start - stop;
int len_adj = slice.start - slice.stop;
//printf("Len adj: %d\n", len_adj);
assert(len_adj <= 0);
mp_seq_replace_slice_no_grow(self->items, self->len, start, stop, self->items/*NULL*/, 0, mp_obj_t);
mp_seq_replace_slice_no_grow(self->items, self->len, slice.start, slice.stop, self->items/*NULL*/, 0, mp_obj_t);
// Clear "freed" elements at the end of list
mp_seq_clear(self->items, self->len + len_adj, self->len, sizeof(*self->items));
self->len += len_adj;
@ -176,12 +176,12 @@ STATIC mp_obj_t list_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
mp_obj_list_t *self = self_in;
#if MICROPY_PY_SLICE
if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
machine_uint_t start, stop;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &start, &stop)) {
mp_bound_slice_t slice;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &slice)) {
assert(0);
}
mp_obj_list_t *res = list_new(stop - start);
mp_seq_copy(res->items, self->items + start, res->len, mp_obj_t);
mp_obj_list_t *res = list_new(slice.stop - slice.start);
mp_seq_copy(res->items, self->items + slice.start, res->len, mp_obj_t);
return res;
}
#endif
@ -193,11 +193,11 @@ STATIC mp_obj_t list_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
mp_obj_list_t *self = self_in;
assert(MP_OBJ_IS_TYPE(value, &mp_type_list));
mp_obj_list_t *slice = value;
machine_uint_t start, stop;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &start, &stop)) {
mp_bound_slice_t slice_out;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &slice_out)) {
assert(0);
}
int len_adj = slice->len - (stop - start);
int len_adj = slice->len - (slice_out.stop - slice_out.start);
//printf("Len adj: %d\n", len_adj);
if (len_adj > 0) {
if (self->len + len_adj > self->alloc) {
@ -206,9 +206,11 @@ STATIC mp_obj_t list_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
self->items = m_renew(mp_obj_t, self->items, self->alloc, self->len + len_adj);
self->alloc = self->len + len_adj;
}
mp_seq_replace_slice_grow_inplace(self->items, self->len, start, stop, slice->items, slice->len, len_adj, mp_obj_t);
mp_seq_replace_slice_grow_inplace(self->items, self->len,
slice_out.start, slice_out.stop, slice->items, slice->len, len_adj, mp_obj_t);
} else {
mp_seq_replace_slice_no_grow(self->items, self->len, start, stop, slice->items, slice->len, mp_obj_t);
mp_seq_replace_slice_no_grow(self->items, self->len,
slice_out.start, slice_out.stop, slice->items, slice->len, mp_obj_t);
// Clear "freed" elements at the end of list
mp_seq_clear(self->items, self->len + len_adj, self->len, sizeof(*self->items));
// TODO: apply allocation policy re: alloc_size

6
py/objstr.c
View File

@ -351,11 +351,11 @@ STATIC mp_obj_t str_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
// load
#if MICROPY_PY_SLICE
if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
machine_uint_t start, stop;
if (!mp_seq_get_fast_slice_indexes(self_len, index, &start, &stop)) {
mp_bound_slice_t slice;
if (!mp_seq_get_fast_slice_indexes(self_len, index, &slice)) {
assert(0);
}
return str_new(type, self_data + start, stop - start);
return str_new(type, self_data + slice.start, slice.stop - slice.start);
}
#endif
uint index_val = mp_get_index(type, self_len, index, false);

8
py/objtuple.c
View File

@ -163,12 +163,12 @@ mp_obj_t mp_obj_tuple_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
mp_obj_tuple_t *self = self_in;
#if MICROPY_PY_SLICE
if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
machine_uint_t start, stop;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &start, &stop)) {
mp_bound_slice_t slice;
if (!mp_seq_get_fast_slice_indexes(self->len, index, &slice)) {
assert(0);
}
mp_obj_tuple_t *res = mp_obj_new_tuple(stop - start, NULL);
mp_seq_copy(res->items, self->items + start, res->len, mp_obj_t);
mp_obj_tuple_t *res = mp_obj_new_tuple(slice.stop - slice.start, NULL);
mp_seq_copy(res->items, self->items + slice.start, res->len, mp_obj_t);
return res;
}
#endif

19
py/sequence.c
View File

@ -51,15 +51,10 @@ void mp_seq_multiply(const void *items, uint item_sz, uint len, uint times, void
}
}
bool mp_seq_get_fast_slice_indexes(machine_uint_t len, mp_obj_t slice, machine_uint_t *begin, machine_uint_t *end) {
bool mp_seq_get_fast_slice_indexes(machine_uint_t len, mp_obj_t slice, mp_bound_slice_t *indexes) {
mp_obj_t ostart, ostop, ostep;
machine_int_t start, stop;
mp_obj_slice_get(slice, &ostart, &ostop, &ostep);
if (ostep != mp_const_none && ostep != MP_OBJ_NEW_SMALL_INT(1)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_NotImplementedError,
"Only slices with step=1 (aka None) are supported"));
return false;
}
if (ostart == mp_const_none) {
start = 0;
@ -96,8 +91,16 @@ bool mp_seq_get_fast_slice_indexes(machine_uint_t len, mp_obj_t slice, machine_u
stop = start;
}
*begin = start;
*end = stop;
indexes->start = start;
indexes->stop = stop;
if (ostep != mp_const_none && ostep != MP_OBJ_NEW_SMALL_INT(1)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_NotImplementedError,
"Only slices with step=1 (aka None) are supported"));
indexes->step = MP_OBJ_SMALL_INT_VALUE(ostep);
return false;
}
indexes->step = 1;
return true;
}