To: vim-dev@vim.org
Subject: Patch 7.0.082
Fcc: outbox
From: Bram Moolenaar <Bram@moolenaar.net>
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------------
 
Patch 7.0.082
Problem:    Calling a function that waits for input may cause List and
	    Dictionary arguments to be freed by the garbage collector.
Solution:   Keep a list of all arguments to internal functions.
Files:	    src/eval.c
 
 
*** ../vim-7.0.081/src/eval.c	Sat Sep  2 13:45:01 2006
--- src/eval.c	Sun Sep  3 15:36:10 2006
***************
*** 248,253 ****
--- 248,264 ----
  };
  
  /*
+  * Struct used to make a list of all arguments used in internal functions.
+  */
+ typedef struct av_list_item_S av_list_item_T;
+ struct av_list_item_S {
+     av_list_item_T  *avl_next;
+     typval_T	    *avl_argvars;
+ };
+ 
+ av_list_item_T *argvars_list = NULL;
+ 
+ /*
   * Info used by a ":for" loop.
   */
  typedef struct
***************
*** 6058,6063 ****
--- 6069,6075 ----
      int		i;
      funccall_T	*fc;
      int		did_free = FALSE;
+     av_list_item_T *av;
  #ifdef FEAT_WINDOWS
      tabpage_T	*tp;
  #endif
***************
*** 6094,6099 ****
--- 6106,6116 ----
  	set_ref_in_ht(&fc->l_avars.dv_hashtab, copyID);
      }
  
+     /* arguments for internal functions */
+     for (av = argvars_list; av != NULL; av = av->avl_next)
+ 	for (i = 0; av->avl_argvars[i].v_type != VAR_UNKNOWN; ++i)
+ 	    set_ref_in_item(&av->avl_argvars[i], copyID);
+ 
      /*
       * 2. Go through the list of dicts and free items without the copyID.
       */
***************
*** 7537,7545 ****
--- 7554,7574 ----
  		    error = ERROR_TOOMANY;
  		else
  		{
+ 		    av_list_item_T  av_list_item;
+ 
+ 		    /* Add the arguments to the "argvars_list" to avoid the
+ 		     * garbage collector not seeing them.  This isn't needed
+ 		     * for user functions, because the arguments are available
+ 		     * in the a: hashtab. */
+ 		    av_list_item.avl_argvars = argvars;
+ 		    av_list_item.avl_next = argvars_list;
+ 		    argvars_list = &av_list_item;
+ 
  		    argvars[argcount].v_type = VAR_UNKNOWN;
  		    functions[i].f_func(argvars, rettv);
  		    error = ERROR_NONE;
+ 
+ 		    argvars_list = av_list_item.avl_next;
  		}
  	    }
  	}
*** ../vim-7.0.081/src/version.c	Sat Sep  2 17:58:36 2006
--- src/version.c	Sun Sep  3 15:35:16 2006
***************
*** 668,669 ****
--- 668,671 ----
  {   /* Add new patch number below this line */
+ /**/
+     82,
  /**/
 
-- 
Just think of all the things we haven't thought of yet.
 
 /// 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    ///