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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   \\\
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\\\        download, build and distribute -- http://www.A-A-P.org        ///
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