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py: Remove mp_obj_str_builder and use vstr instead.

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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.
This commit is contained in:
Damien George
2015-01-21 22:48:37 +00:00
parent 0b9ee86133
commit 05005f679e
18 changed files with 130 additions and 143 deletions
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7
py/objint.c
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@@ -340,8 +340,9 @@ STATIC mp_obj_t int_to_bytes(mp_uint_t n_args, const mp_obj_t *args) {
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 @@ STATIC mp_obj_t int_to_bytes(mp_uint_t n_args, const mp_obj_t *args) {
}
}
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);