Commit: patch 9.2.0257: unnecessary memory allocation in set_callback()

[Christian Brabandt]

patch 9.2.0257: unnecessary memory allocation in set_callback()

Commit: https://github.com/vim/vim/commit/02abcf381f3bdb58447ec6e66ee4f4d15d0783cc
Author: Shane Harper <sh...@shaneharper.net>
Date: Thu Mar 26 20:46:52 2026 +0000

patch 9.2.0257: unnecessary memory allocation in set_callback()

Problem: Unnecessary memory allocation in set_callback(); after
set_callback(), callers must manually free the source
callback's name if cb_free_name is set.
Solution: Refactor set_callback() to re-use the callback name when
possible to avoid extra memory allocations and clean up so the
callers do not have to take care themselves (Shane Harper).

closes: #19831

Signed-off-by: Shane Harper <sh...@shaneharper.net>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/change.c b/src/change.c
index ed6f442a2..3a4fefb2b 100644
--- a/src/change.c
+++ b/src/change.c
@@ -373,8 +373,6 @@ f_listener_add(typval_T *argvars, typval_T *rettv)
}

set_callback(&lnr->lr_callback, &callback);
- if (callback.cb_free_name)
- vim_free(callback.cb_name);

lnr->lr_id = ++next_listener_id;
rettv->vval.v_number = lnr->lr_id;
diff --git a/src/clipboard.c b/src/clipboard.c
index e869ae63e..454b68609 100644
--- a/src/clipboard.c
+++ b/src/clipboard.c
@@ -3789,8 +3789,6 @@ clip_provider_get_callback(

// func_tv owns the function name, so we must make a copy for the callback
set_callback(callback, &cb);
- if (cb.cb_free_name)
- vim_free(cb.cb_name);
clear_tv(&func_tv);
return OK;
}
diff --git a/src/evalvars.c b/src/evalvars.c
index 86bbf1860..1df4af997 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -5289,6 +5289,13 @@ put_callback(callback_T *cb, typval_T *tv)
}
}

+ static bool
+does_callback_own_cb_name(callback_T *cb)
+{
+ // If cb_partial != NULL then *cb->cb_name is owned by the partial.
+ return cb->cb_partial || cb->cb_free_name;
+}
+
/*
* Make a copy of "src" into "dest", allocating the function name if needed,
* without incrementing the refcount.
@@ -5296,19 +5303,13 @@ put_callback(callback_T *cb, typval_T *tv)
void
set_callback(callback_T *dest, callback_T *src)
{
- if (src->cb_partial == NULL)
+ *dest = *src;
+ if (!does_callback_own_cb_name(src))
{
- // just a function name, make a copy
dest->cb_name = vim_strsave(src->cb_name);
dest->cb_free_name = TRUE;
}
- else
- {
- // cb_name is a pointer into cb_partial
- dest->cb_name = src->cb_name;
- dest->cb_free_name = FALSE;
- }
- dest->cb_partial = src->cb_partial;
+ *src = (callback_T){0};
}

/*
diff --git a/src/job.c b/src/job.c
index c81421aeb..041a8e9b9 100644
--- a/src/job.c
+++ b/src/job.c
@@ -1699,8 +1699,6 @@ f_prompt_setcallback(typval_T *argvars, typval_T *rettv UNUSED)

free_callback(&buf->b_prompt_callback);
set_callback(&buf->b_prompt_callback, &callback);
- if (callback.cb_free_name)
- vim_free(callback.cb_name);
}

/*
@@ -1728,8 +1726,6 @@ f_prompt_setinterrupt(typval_T *argvars, typval_T *rettv UNUSED)

free_callback(&buf->b_prompt_interrupt);
set_callback(&buf->b_prompt_interrupt, &callback);
- if (callback.cb_free_name)
- vim_free(callback.cb_name);
}


diff --git a/src/option.c b/src/option.c
index 454465299..c369fdbf0 100644
--- a/src/option.c
+++ b/src/option.c
@@ -9239,8 +9239,6 @@ option_set_callback_func(char_u *optval UNUSED, callback_T *optcb UNUSED)

free_callback(optcb);
set_callback(optcb, &cb);
- if (cb.cb_free_name)
- vim_free(cb.cb_name);
free_tv(tv);

char_u *dot = NULL;
diff --git a/src/popupwin.c b/src/popupwin.c
index 2188305de..f14e970e9 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -1037,8 +1037,6 @@ apply_general_options(win_T *wp, dict_T *dict)
{
free_callback(&wp->w_filter_cb);
set_callback(&wp->w_filter_cb, &callback);
- if (callback.cb_free_name)
- vim_free(callback.cb_name);
}
}
nr = dict_get_bool(dict, "mapping", -1);
@@ -1069,9 +1067,6 @@ apply_general_options(win_T *wp, dict_T *dict)

free_callback(&wp->w_close_cb);
set_callback(&wp->w_close_cb, &callback);
- if (callback.cb_free_name)
- vim_free(callback.cb_name);
-
return OK;
}

@@ -2527,8 +2522,6 @@ popup_create(typval_T *argvars, typval_T *rettv, create_type_T type)
if (callback.cb_name != NULL)
{
set_callback(&wp->w_filter_cb, &callback);
- if (callback.cb_free_name)
- vim_free(callback.cb_name);
}

wp->w_p_wrap = 0;
diff --git a/src/quickfix.c b/src/quickfix.c
index ed82c6161..59579171c 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -8158,11 +8158,7 @@ qf_setprop_qftf(qf_info_T *qi UNUSED, qf_list_T *qfl, dictitem_T *di)
cb = get_callback(&di->di_tv);
if (cb.cb_name == NULL || *cb.cb_name == NUL)
return OK;
-
set_callback(&qfl->qf_qftf_cb, &cb);
- if (cb.cb_free_name)
- vim_free(cb.cb_name);
-
return OK;
}

diff --git a/src/sound.c b/src/sound.c
index 7e7d434c5..4e5acb5d4 100644
--- a/src/sound.c
+++ b/src/sound.c
@@ -63,8 +63,6 @@ get_sound_callback(typval_T *arg)
soundcb->snd_next = first_callback;
first_callback = soundcb;
set_callback(&soundcb->snd_callback, &callback);
- if (callback.cb_free_name)
- vim_free(callback.cb_name);
return soundcb;
}

diff --git a/src/time.c b/src/time.c
index 7b91a7c01..16112d6ee 100644
--- a/src/time.c
+++ b/src/time.c
@@ -912,8 +912,6 @@ f_timer_start(typval_T *argvars, typval_T *rettv)
return;
}
set_callback(&timer->tr_callback, &callback);
- if (callback.cb_free_name)
- vim_free(callback.cb_name);
rettv->vval.v_number = (varnumber_T)timer->tr_id;
}

diff --git a/src/version.c b/src/version.c
index 5dbd0f401..770e09b86 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 257,
/**/
256,
/**/