py: Add mp_obj_new_str_from_vstr, and use it where relevant.

This patch allows to reuse vstr memory when creating str/bytes object.
This improves memory usage.

Also saves code ROM: 128 bytes on stmhal, 92 bytes on bare-arm, and 88
bytes on unix x64.

1 files changed, 1 insertions, 0 deletions

diff --git a/py/obj.h b/py/obj.h
index 0424048599..d0ea4c1123 100644
--- a/py/obj.h
+++ b/py/obj.h
@@ -400,6 +400,7 @@ mp_obj_t mp_obj_new_int_from_str_len(const char **str, mp_uint_t len, bool neg,
 mp_obj_t mp_obj_new_int_from_ll(long long val); // this must return a multi-precision integer object (or raise an overflow exception)
 mp_obj_t mp_obj_new_int_from_ull(unsigned long long val); // this must return a multi-precision integer object (or raise an overflow exception)
 mp_obj_t mp_obj_new_str(const char* data, mp_uint_t len, bool make_qstr_if_not_already);
+mp_obj_t mp_obj_new_str_from_vstr(const mp_obj_type_t *type, vstr_t *vstr);
 mp_obj_t mp_obj_new_bytes(const byte* data, mp_uint_t len);
 mp_obj_t mp_obj_new_bytearray(mp_uint_t n, void *items);
 mp_obj_t mp_obj_new_bytearray_by_ref(mp_uint_t n, void *items);