djsundog
/
circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

objstr: Switch from in-object string data to ptr to separate memory area. 

This is pre-requisite for having efficient implementation of str<->bytes
conversion, and having that efficient is required with unfortunare
str vs bytes dichotomy in Python3.
This commit is contained in:
Paul Sokolovsky 2014-03-20 16:47:44 +02:00
parent 42901554db
commit 5972b4c05f
1 changed files with 15 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
py/objstr.c
View File

@ -14,7 +14,7 @@ typedef struct _mp_obj_str_t {
mp_obj_base_t base;
machine_uint_t hash : 16; // XXX here we assume the hash size is 16 bits (it is at the moment; see qstr.c)
machine_uint_t len : 16; // len == number of bytes used in data, alloc = len + 1 because (at the moment) we also append a null byte
byte data[];
const byte *data;
} mp_obj_str_t;
// use this macro to extract the string hash
@ -636,10 +636,12 @@ const mp_obj_type_t bytes_type = {
};
mp_obj_t mp_obj_str_builder_start(const mp_obj_type_t *type, uint len, byte **data) {
mp_obj_str_t *o = m_new_obj_var(mp_obj_str_t, byte, len + 1);
mp_obj_str_t *o = m_new_obj(mp_obj_str_t);
o->base.type = type;
o->len = len;
*data = o->data;
byte *p = m_new(byte, len + 1);
o->data = p;
*data = p;
return o;
}
@ -647,17 +649,22 @@ mp_obj_t mp_obj_str_builder_end(mp_obj_t o_in) {
assert(MP_OBJ_IS_STR(o_in));
mp_obj_str_t *o = o_in;
o->hash = qstr_compute_hash(o->data, o->len);
o->data[o->len] = '\0'; // for now we add null for compatibility with C ASCIIZ strings
byte *p = (byte*)o->data;
p[o->len] = '\0'; // for now we add null for compatibility with C ASCIIZ strings
return o;
}
STATIC mp_obj_t str_new(const mp_obj_type_t *type, const byte* data, uint len) {
mp_obj_str_t *o = m_new_obj_var(mp_obj_str_t, byte, len + 1);
mp_obj_str_t *o = m_new_obj(mp_obj_str_t);
o->base.type = type;
o->hash = qstr_compute_hash(data, len);
o->len = len;
memcpy(o->data, data, len * sizeof(byte));
o->data[len] = '\0'; // for now we add null for compatibility with C ASCIIZ strings
if (data) {
o->hash = qstr_compute_hash(data, len);
byte *p = m_new(byte, len + 1);
o->data = p;
memcpy(p, data, len * sizeof(byte));
p[len] = '\0'; // for now we add null for compatibility with C ASCIIZ strings
}
return o;
}