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/vstr.c b/py/vstr.c
index 6856cfe..63358d5 100644
--- a/py/vstr.c
+++ b/py/vstr.c
@@ -52,6 +52,11 @@
vstr->fixed_buf = false;
}
+void vstr_init_len(vstr_t *vstr, size_t len) {
+ vstr_init(vstr, len + 1);
+ vstr_add_len(vstr, len);
+}
+
void vstr_init_fixed_buf(vstr_t *vstr, size_t alloc, char *buf) {
assert(alloc > 0); // need at least room for the null byte
vstr->alloc = alloc;