Patch 7.3.434
Problem: Using join() can be slow.
Solution: Compute the size of the result before allocation to avoid a lot of
allocations and copies. (Taro Muraoka)
Files: src/eval.c
*** ../vim-7.3.433/src/eval.c 2012-02-05 00:39:14.000000000 +0100
--- src/eval.c 2012-02-06 00:05:31.000000000 +0100
***************
*** 442,447 ****
--- 442,448 ----
static list_T *list_copy __ARGS((list_T *orig, int deep, int copyID));
static void list_remove __ARGS((list_T *l, listitem_T *item, listitem_T
*item2));
static char_u *list2string __ARGS((typval_T *tv, int copyID));
+ static int list_join_inner __ARGS((garray_T *gap, list_T *l, char_u *sep, int
echo_style, int copyID, garray_T *join_gap));
static int list_join __ARGS((garray_T *gap, list_T *l, char_u *sep, int echo,
int copyID));
static int free_unref_items __ARGS((int copyID));
static void set_ref_in_ht __ARGS((hashtab_T *ht, int copyID));
***************
*** 6571,6617 ****
return (char_u *)ga.ga_data;
}
! /*
! * Join list "l" into a string in "*gap", using separator "sep".
! * When "echo_style" is TRUE use String as echoed, otherwise as inside a List.
! * Return FAIL or OK.
! */
static int
! list_join(gap, l, sep, echo_style, copyID)
! garray_T *gap;
list_T *l;
char_u *sep;
int echo_style;
int copyID;
{
int first = TRUE;
char_u *tofree;
char_u numbuf[NUMBUFLEN];
listitem_T *item;
char_u *s;
for (item = l->lv_first; item != NULL && !got_int; item = item->li_next)
{
- if (first)
- first = FALSE;
- else
- ga_concat(gap, sep);
-
if (echo_style)
s = echo_string(&item->li_tv, &tofree, numbuf, copyID);
else
s = tv2string(&item->li_tv, &tofree, numbuf, copyID);
- if (s != NULL)
- ga_concat(gap, s);
- vim_free(tofree);
if (s == NULL)
return FAIL;
line_breakcheck();
}
return OK;
}
/*
* Garbage collection for lists and dictionaries.
*
* We use reference counts to be able to free most items right away when they
--- 6572,6690 ----
return (char_u *)ga.ga_data;
}
! typedef struct join_S {
! char_u *s;
! char_u *tofree;
! } join_T;
!
static int
! list_join_inner(gap, l, sep, echo_style, copyID, join_gap)
! garray_T *gap; /* to store the result in */
list_T *l;
char_u *sep;
int echo_style;
int copyID;
+ garray_T *join_gap; /* to keep each list item string */
{
+ int i;
+ join_T *p;
+ int len;
+ int sumlen = 0;
int first = TRUE;
char_u *tofree;
char_u numbuf[NUMBUFLEN];
listitem_T *item;
char_u *s;
+ /* Stringify each item in the list. */
for (item = l->lv_first; item != NULL && !got_int; item = item->li_next)
{
if (echo_style)
s = echo_string(&item->li_tv, &tofree, numbuf, copyID);
else
s = tv2string(&item->li_tv, &tofree, numbuf, copyID);
if (s == NULL)
return FAIL;
+
+ len = (int)STRLEN(s);
+ sumlen += len;
+
+ ga_grow(join_gap, 1);
+ p = ((join_T *)join_gap->ga_data) + (join_gap->ga_len++);
+ if (tofree != NULL || s != numbuf)
+ {
+ p->s = s;
+ p->tofree = tofree;
+ }
+ else
+ {
+ p->s = vim_strnsave(s, len);
+ p->tofree = p->s;
+ }
+
+ line_breakcheck();
+ }
+
+ /* Allocate result buffer with its total size, avoid re-allocation and
+ * multiple copy operations. Add 2 for a tailing ']' and NUL. */
+ if (join_gap->ga_len >= 2)
+ sumlen += (int)STRLEN(sep) * (join_gap->ga_len - 1);
+ if (ga_grow(gap, sumlen + 2) == FAIL)
+ return FAIL;
+
+ for (i = 0; i < join_gap->ga_len && !got_int; ++i)
+ {
+ if (first)
+ first = FALSE;
+ else
+ ga_concat(gap, sep);
+ p = ((join_T *)join_gap->ga_data) + i;
+
+ if (p->s != NULL)
+ ga_concat(gap, p->s);
line_breakcheck();
}
+
return OK;
}
/*
+ * Join list "l" into a string in "*gap", using separator "sep".
+ * When "echo_style" is TRUE use String as echoed, otherwise as inside a List.
+ * Return FAIL or OK.
+ */
+ static int
+ list_join(gap, l, sep, echo_style, copyID)
+ garray_T *gap;
+ list_T *l;
+ char_u *sep;
+ int echo_style;
+ int copyID;
+ {
+ garray_T join_ga;
+ int retval;
+ join_T *p;
+ int i;
+
+ ga_init2(&join_ga, (int)sizeof(join_T), l->lv_len);
+ retval = list_join_inner(gap, l, sep, echo_style, copyID, &join_ga);
+
+ /* Dispose each item in join_ga. */
+ if (join_ga.ga_data != NULL)
+ {
+ p = (join_T *)join_ga.ga_data;
+ for (i = 0; i < join_ga.ga_len; ++i)
+ {
+ vim_free(p->tofree);
+ ++p;
+ }
+ ga_clear(&join_ga);
+ }
+
+ return retval;
+ }
+
+ /*
* Garbage collection for lists and dictionaries.
*
* We use reference counts to be able to free most items right away when they
***************
*** 13406,13412 ****
char_u *rhs;
int mode;
int abbr = FALSE;
! int get_dict = FALSE;
mapblock_T *mp;
int buffer_local;
--- 13479,13485 ----
char_u *rhs;
int mode;
int abbr = FALSE;
! int get_dict = FALSE;
mapblock_T *mp;
int buffer_local;
*** ../vim-7.3.433/src/version.c 2012-02-05 23:10:25.000000000 +0100
--- src/version.c 2012-02-06 00:10:23.000000000 +0100
***************
*** 716,717 ****
--- 716,719 ----
{ /* Add new patch number below this line */
+ /**/
+ 434,
/**/
--
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