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.
diff --git a/py/objint.c b/py/objint.c
index 049d041..e8d86ad 100644
--- a/py/objint.c
+++ b/py/objint.c
@@ -340,8 +340,9 @@
mp_int_t val = mp_obj_int_get_checked(args[0]);
mp_uint_t len = MP_OBJ_SMALL_INT_VALUE(args[1]);
- byte *data;
- mp_obj_t o = mp_obj_str_builder_start(&mp_type_bytes, len, &data);
+ vstr_t vstr;
+ vstr_init_len(&vstr, len);
+ byte *data = (byte*)vstr.buf;
memset(data, 0, len);
if (MP_ENDIANNESS_LITTLE) {
@@ -353,7 +354,7 @@
}
}
- return mp_obj_str_builder_end(o);
+ return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(int_to_bytes_obj, 2, 4, int_to_bytes);