TonBERRY/micropython
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py: Add iter_buf to getiter type method.

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Allows to iterate over the following without allocating on the heap:
- tuple
- list
- string, bytes
- bytearray, array
- dict (not dict.keys, dict.values, dict.items)
- set, frozenset

Allows to call the following without heap memory:
- all, any, min, max, sum

TODO: still need to allocate stack memory in bytecode for iter_buf.
This commit is contained in:
Damien George
2016-01-09 23:14:54 +00:00
parent 101886f529
commit ae8d867586
36 changed files with 162 additions and 106 deletions
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14
py/objarray.c
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@@ -59,7 +59,7 @@
#define TYPECODE_MASK (~(size_t)0)
#endif
STATIC mp_obj_t array_iterator_new(mp_obj_t array_in);
STATIC mp_obj_t array_iterator_new(mp_obj_t array_in, mp_obj_iter_buf_t *iter_buf);
STATIC mp_obj_t array_append(mp_obj_t self_in, mp_obj_t arg);
STATIC mp_obj_t array_extend(mp_obj_t self_in, mp_obj_t arg_in);
STATIC mp_int_t array_get_buffer(mp_obj_t o_in, mp_buffer_info_t *bufinfo, mp_uint_t flags);
@@ -141,7 +141,8 @@ STATIC mp_obj_t array_construct(char typecode, mp_obj_t initializer) {
mp_obj_array_t *array = array_new(typecode, len);
mp_obj_t iterable = mp_getiter(initializer);
mp_obj_iter_buf_t iter_buf;
mp_obj_t iterable = mp_getiter(initializer, &iter_buf);
mp_obj_t item;
size_t i = 0;
while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
@@ -608,15 +609,18 @@ STATIC mp_obj_t array_it_iternext(mp_obj_t self_in) {
STATIC const mp_obj_type_t array_it_type = {
{ &mp_type_type },
.name = MP_QSTR_iterator,
.getiter = mp_identity,
.getiter = mp_identity_getiter,
.iternext = array_it_iternext,
};
STATIC mp_obj_t array_iterator_new(mp_obj_t array_in) {
STATIC mp_obj_t array_iterator_new(mp_obj_t array_in, mp_obj_iter_buf_t *iter_buf) {
assert(sizeof(mp_obj_array_t) <= sizeof(mp_obj_iter_buf_t));
mp_obj_array_t *array = MP_OBJ_TO_PTR(array_in);
mp_obj_array_it_t *o = m_new0(mp_obj_array_it_t, 1);
mp_obj_array_it_t *o = (mp_obj_array_it_t*)iter_buf;
o->base.type = &array_it_type;
o->array = array;
o->offset = 0;
o->cur = 0;
#if MICROPY_PY_BUILTINS_MEMORYVIEW
if (array->base.type == &mp_type_memoryview) {
o->offset = array->free;