mirror/guile
mirror/guile
1
Fork 0
mirror of https://git.savannah.gnu.org/git/guile.git synced 2025-04-29 19:30:36 +02:00
Code Activity

'string->symbol' avoids copying the underlying string.

Browse source 
* libguile/strings.c (scm_i_make_symbol): Reuse NAME's stringbuf unless
it's mutable or NAME starts at a non-zero offset or has a different
length.
This commit is contained in:
Ludovic Courtès 2022-02-05 23:27:48 +01:00
parent 2f9bc7fe61
commit 032acdeac9
1 changed files with 9 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

12
libguile/strings.c
View file

@ -763,10 +763,16 @@ SCM
scm_i_make_symbol (SCM name, scm_t_bits flags, unsigned long hash)
{
SCM buf, symbol;
size_t length = STRING_LENGTH (name);
size_t start, length = STRING_LENGTH (name);
name = scm_i_substring_copy (name, 0, length);
buf = STRING_STRINGBUF (name);
get_str_buf_start (&name, &buf, &start);
if (SCM_UNLIKELY (STRINGBUF_MUTABLE (buf)
|| start != 0
|| STRINGBUF_LENGTH (buf) != length))
{
name = scm_i_substring_copy (name, 0, length);
buf = STRING_STRINGBUF (name);
}
symbol = scm_words (scm_tc7_symbol | flags, 3);
SCM_SET_CELL_WORD_1 (symbol, SCM_UNPACK (buf));