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+To: vim-dev@vim.org
+Subject: Patch 7.2.188
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.2.188
+Problem: Crash with specific use of function calls. (Meikel Brandmeyer)
+Solution: Make sure the items referenced by a function call are not freed
+ twice. (based on patch from Nico Weber)
+Files: src/eval.c
+
+
+*** ../vim-7.2.187/src/eval.c 2009-05-16 17:29:37.000000000 +0200
+--- src/eval.c 2009-05-22 20:04:22.000000000 +0200
+***************
+*** 129,136 ****
+--- 129,139 ----
+ /*
+ * When recursively copying lists and dicts we need to remember which ones we
+ * have done to avoid endless recursiveness. This unique ID is used for that.
++ * The last bit is used for previous_funccal, ignored when comparing.
+ */
+ static int current_copyID = 0;
++ #define COPYID_INC 2
++ #define COPYID_MASK (~0x1)
+
+ /*
+ * Array to hold the hashtab with variables local to each sourced script.
+***************
+*** 439,444 ****
+--- 442,448 ----
+ 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 __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));
+ static void set_ref_in_list __ARGS((list_T *l, int copyID));
+ static void set_ref_in_item __ARGS((typval_T *tv, int copyID));
+***************
+*** 6494,6507 ****
+ int
+ garbage_collect()
+ {
+! dict_T *dd;
+! list_T *ll;
+! int copyID = ++current_copyID;
+ buf_T *buf;
+ win_T *wp;
+ int i;
+ funccall_T *fc, **pfc;
+! int did_free = FALSE;
+ #ifdef FEAT_WINDOWS
+ tabpage_T *tp;
+ #endif
+--- 6498,6510 ----
+ int
+ garbage_collect()
+ {
+! int copyID;
+ buf_T *buf;
+ win_T *wp;
+ int i;
+ funccall_T *fc, **pfc;
+! int did_free;
+! int did_free_funccal = FALSE;
+ #ifdef FEAT_WINDOWS
+ tabpage_T *tp;
+ #endif
+***************
+*** 6511,6520 ****
+--- 6514,6538 ----
+ may_garbage_collect = FALSE;
+ garbage_collect_at_exit = FALSE;
+
++ /* We advance by two because we add one for items referenced through
++ * previous_funccal. */
++ current_copyID += COPYID_INC;
++ copyID = current_copyID;
++
+ /*
+ * 1. Go through all accessible variables and mark all lists and dicts
+ * with copyID.
+ */
++
++ /* Don't free variables in the previous_funccal list unless they are only
++ * referenced through previous_funccal. This must be first, because if
++ * the item is referenced elsewhere it must not be freed. */
++ for (fc = previous_funccal; fc != NULL; fc = fc->caller)
++ {
++ set_ref_in_ht(&fc->l_vars.dv_hashtab, copyID + 1);
++ set_ref_in_ht(&fc->l_avars.dv_hashtab, copyID + 1);
++ }
++
+ /* script-local variables */
+ for (i = 1; i <= ga_scripts.ga_len; ++i)
+ set_ref_in_ht(&SCRIPT_VARS(i), copyID);
+***************
+*** 6546,6556 ****
+ /* v: vars */
+ set_ref_in_ht(&vimvarht, copyID);
+
+ /*
+! * 2. Go through the list of dicts and free items without the copyID.
+ */
+ for (dd = first_dict; dd != NULL; )
+! if (dd->dv_copyID != copyID)
+ {
+ /* Free the Dictionary and ordinary items it contains, but don't
+ * recurse into Lists and Dictionaries, they will be in the list
+--- 6564,6610 ----
+ /* v: vars */
+ set_ref_in_ht(&vimvarht, copyID);
+
++ /* Free lists and dictionaries that are not referenced. */
++ did_free = free_unref_items(copyID);
++
++ /* check if any funccal can be freed now */
++ for (pfc = &previous_funccal; *pfc != NULL; )
++ {
++ if (can_free_funccal(*pfc, copyID))
++ {
++ fc = *pfc;
++ *pfc = fc->caller;
++ free_funccal(fc, TRUE);
++ did_free = TRUE;
++ did_free_funccal = TRUE;
++ }
++ else
++ pfc = &(*pfc)->caller;
++ }
++ if (did_free_funccal)
++ /* When a funccal was freed some more items might be garbage
++ * collected, so run again. */
++ (void)garbage_collect();
++
++ return did_free;
++ }
++
++ /*
++ * Free lists and dictionaries that are no longer referenced.
++ */
++ static int
++ free_unref_items(copyID)
++ int copyID;
++ {
++ dict_T *dd;
++ list_T *ll;
++ int did_free = FALSE;
++
+ /*
+! * Go through the list of dicts and free items without the copyID.
+ */
+ for (dd = first_dict; dd != NULL; )
+! if ((dd->dv_copyID & COPYID_MASK) != (copyID & COPYID_MASK))
+ {
+ /* Free the Dictionary and ordinary items it contains, but don't
+ * recurse into Lists and Dictionaries, they will be in the list
+***************
+*** 6565,6576 ****
+ dd = dd->dv_used_next;
+
+ /*
+! * 3. Go through the list of lists and free items without the copyID.
+! * But don't free a list that has a watcher (used in a for loop), these
+! * are not referenced anywhere.
+ */
+ for (ll = first_list; ll != NULL; )
+! if (ll->lv_copyID != copyID && ll->lv_watch == NULL)
+ {
+ /* Free the List and ordinary items it contains, but don't recurse
+ * into Lists and Dictionaries, they will be in the list of dicts
+--- 6619,6631 ----
+ dd = dd->dv_used_next;
+
+ /*
+! * Go through the list of lists and free items without the copyID.
+! * But don't free a list that has a watcher (used in a for loop), these
+! * are not referenced anywhere.
+ */
+ for (ll = first_list; ll != NULL; )
+! if ((ll->lv_copyID & COPYID_MASK) != (copyID & COPYID_MASK)
+! && ll->lv_watch == NULL)
+ {
+ /* Free the List and ordinary items it contains, but don't recurse
+ * into Lists and Dictionaries, they will be in the list of dicts
+***************
+*** 6584,6603 ****
+ else
+ ll = ll->lv_used_next;
+
+- /* check if any funccal can be freed now */
+- for (pfc = &previous_funccal; *pfc != NULL; )
+- {
+- if (can_free_funccal(*pfc, copyID))
+- {
+- fc = *pfc;
+- *pfc = fc->caller;
+- free_funccal(fc, TRUE);
+- did_free = TRUE;
+- }
+- else
+- pfc = &(*pfc)->caller;
+- }
+-
+ return did_free;
+ }
+
+--- 6639,6644 ----
+***************
+*** 18842,18847 ****
+--- 18883,18889 ----
+ {
+ hash_init(&dict->dv_hashtab);
+ dict->dv_refcount = DO_NOT_FREE_CNT;
++ dict->dv_copyID = 0;
+ dict_var->di_tv.vval.v_dict = dict;
+ dict_var->di_tv.v_type = VAR_DICT;
+ dict_var->di_tv.v_lock = VAR_FIXED;
+***************
+*** 21294,21301 ****
+ current_funccal = fc->caller;
+ --depth;
+
+! /* if the a:000 list and the a: dict are not referenced we can free the
+! * funccall_T and what's in it. */
+ if (fc->l_varlist.lv_refcount == DO_NOT_FREE_CNT
+ && fc->l_vars.dv_refcount == DO_NOT_FREE_CNT
+ && fc->l_avars.dv_refcount == DO_NOT_FREE_CNT)
+--- 21336,21343 ----
+ current_funccal = fc->caller;
+ --depth;
+
+! /* If the a:000 list and the l: and a: dicts are not referenced we can
+! * free the funccall_T and what's in it. */
+ if (fc->l_varlist.lv_refcount == DO_NOT_FREE_CNT
+ && fc->l_vars.dv_refcount == DO_NOT_FREE_CNT
+ && fc->l_avars.dv_refcount == DO_NOT_FREE_CNT)
+***************
+*** 21334,21340 ****
+
+ /*
+ * Return TRUE if items in "fc" do not have "copyID". That means they are not
+! * referenced from anywhere.
+ */
+ static int
+ can_free_funccal(fc, copyID)
+--- 21376,21382 ----
+
+ /*
+ * Return TRUE if items in "fc" do not have "copyID". That means they are not
+! * referenced from anywhere that is in use.
+ */
+ static int
+ can_free_funccal(fc, copyID)
+*** ../vim-7.2.187/src/version.c 2009-05-23 14:27:43.000000000 +0200
+--- src/version.c 2009-05-24 13:20:49.000000000 +0200
+***************
+*** 678,679 ****
+--- 678,681 ----
+ { /* Add new patch number below this line */
++ /**/
++ 188,
+ /**/
+
+--
+ARTHUR: ... and I am your king ....
+OLD WOMAN: Ooooh! I didn't know we had a king. I thought we were an
+ autonomous collective ...
+ "Monty Python and the Holy Grail" PYTHON (MONTY) PICTURES LTD
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net \\\
+/// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\ download, build and distribute -- http://www.A-A-P.org ///
+ \\\ help me help AIDS victims -- http://ICCF-Holland.org ///
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