py: Remove mp_obj_str_builder and use vstr instead.

With this patch str/bytes construction is streamlined.  Always use a
vstr to build a str/bytes object.  If the size is known beforehand then
use vstr_init_len to allocate only required memory.  Otherwise use
vstr_init and the vstr will grow as needed.  Then use
mp_obj_new_str_from_vstr to create a str/bytes object using the vstr
memory.

Saves code ROM: 68 bytes on stmhal, 108 bytes on bare-arm, and 336 bytes
on unix x64.

1 files changed, 0 insertions, 3 deletions

diff --git a/py/obj.h b/py/obj.h
index d0ea4c1123..2d506858dd 100644
--- a/py/obj.h
+++ b/py/obj.h
@@ -500,9 +500,6 @@ mp_obj_t mp_alloc_emergency_exception_buf(mp_obj_t size_in);
 void mp_init_emergency_exception_buf(void);
 
 // str
-mp_obj_t mp_obj_str_builder_start(const mp_obj_type_t *type, mp_uint_t len, byte **data);
-mp_obj_t mp_obj_str_builder_end(mp_obj_t o_in);
-mp_obj_t mp_obj_str_builder_end_with_len(mp_obj_t o_in, mp_uint_t len);
 bool mp_obj_str_equal(mp_obj_t s1, mp_obj_t s2);
 mp_uint_t mp_obj_str_get_hash(mp_obj_t self_in);
 mp_uint_t mp_obj_str_get_len(mp_obj_t self_in);