patch 8.2.2621: typval2type() cannot handle recursive structures

Problem:    typval2type() cannot handle recursive structures.
Solution:   Use copyID. (closes #7979)

src/list.c

@@ -2052,7 +2052,7 @@ filter_map(typval_T *argvars, typval_T *rettv, filtermap_T filtermap)
     {
 	// Check that map() does not change the type of the dict.
 	ga_init2(&type_list, sizeof(type_T *), 10);
-	type = typval2type(argvars, &type_list);
+	type = typval2type(argvars, get_copyID(), &type_list);
     }
 
     if (argvars[0].v_type == VAR_BLOB)
@@ -2558,7 +2558,7 @@ extend(typval_T *argvars, typval_T *rettv, char_u *arg_errmsg, int is_new)
     {
 	// Check that map() does not change the type of the dict.
 	ga_init2(&type_list, sizeof(type_T *), 10);
-	type = typval2type(argvars, &type_list);
+	type = typval2type(argvars, get_copyID(), &type_list);
     }
 
     if (argvars[0].v_type == VAR_LIST && argvars[1].v_type == VAR_LIST)

src/proto/vim9type.pro

@@ -9,7 +9,7 @@ type_T *alloc_func_type(type_T *ret_type, int argcount, garray_T *type_gap);
 type_T *get_func_type(type_T *ret_type, int argcount, garray_T *type_gap);
 int func_type_add_arg_types(type_T *functype, int argcount, garray_T *type_gap);
 int need_convert_to_bool(type_T *type, typval_T *tv);
-type_T *typval2type(typval_T *tv, garray_T *type_gap);
+type_T *typval2type(typval_T *tv, int copyID, garray_T *type_gap);
 type_T *typval2type_vimvar(typval_T *tv, garray_T *type_gap);
 int check_typval_arg_type(type_T *expected, typval_T *actual_tv, int arg_idx);
 int check_typval_type(type_T *expected, typval_T *actual_tv, where_T where);

src/testdir/test_vimscript.vim

@@ -6606,6 +6606,13 @@ func Test_typename()
   call assert_equal('list<number>', typename([123]))
   call assert_equal('dict<number>', typename(#{key: 123}))
   call assert_equal('list<dict<number>>', typename([#{key: 123}]))
+
+  let l = []
+  let d = #{a: 0}
+  let l = [d]
+  let l[0].e = #{b: l}
+  call assert_equal('list<dict<any>>', typename(l))
+  call assert_equal('dict<any>', typename(d))
 endfunc
 
 "-------------------------------------------------------------------------------

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2621,
 /**/
     2620,
 /**/

src/vim9script.c

@@ -750,7 +750,7 @@ update_vim9_script_var(
     if (sv != NULL)
     {
 	if (*type == NULL)
-	    *type = typval2type(tv, &si->sn_type_list);
+	    *type = typval2type(tv, get_copyID(), &si->sn_type_list);
 	sv->sv_type = *type;
     }
 

src/vim9type.c

@@ -254,7 +254,7 @@ func_type_add_arg_types(
  * "type_gap" is used to temporarily create types in.
  */
     static type_T *
-typval2type_int(typval_T *tv, garray_T *type_gap)
+typval2type_int(typval_T *tv, int copyID, garray_T *type_gap)
 {
     type_T  *type;
     type_T  *member_type = &t_any;
@@ -276,11 +276,15 @@ typval2type_int(typval_T *tv, garray_T *type_gap)
 	    return &t_list_empty;
 	if (l->lv_first == &range_list_item)
 	    return &t_list_number;
+	if (l->lv_copyID == copyID)
+	    // avoid recursion
+	    return &t_list_any;
+	l->lv_copyID = copyID;
 
 	// Use the common type of all members.
-	member_type = typval2type(&l->lv_first->li_tv, type_gap);
+	member_type = typval2type(&l->lv_first->li_tv, copyID, type_gap);
 	for (li = l->lv_first->li_next; li != NULL; li = li->li_next)
-	    common_type(typval2type(&li->li_tv, type_gap),
+	    common_type(typval2type(&li->li_tv, copyID, type_gap),
 					  member_type, &member_type, type_gap);
 	return get_list_type(member_type, type_gap);
     }
@@ -289,17 +293,21 @@ typval2type_int(typval_T *tv, garray_T *type_gap)
     {
 	dict_iterator_T iter;
 	typval_T	*value;
+	dict_T		*d = tv->vval.v_dict;
 
-	if (tv->vval.v_dict == NULL
-				   || tv->vval.v_dict->dv_hashtab.ht_used == 0)
+	if (d == NULL || d->dv_hashtab.ht_used == 0)
 	    return &t_dict_empty;
+	if (d->dv_copyID == copyID)
+	    // avoid recursion
+	    return &t_dict_any;
+	d->dv_copyID = copyID;
 
 	// Use the common type of all values.
 	dict_iterate_start(tv, &iter);
 	dict_iterate_next(&iter, &value);
-	member_type = typval2type(value, type_gap);
+	member_type = typval2type(value, copyID, type_gap);
 	while (dict_iterate_next(&iter, &value) != NULL)
-	    common_type(typval2type(value, type_gap),
+	    common_type(typval2type(value, copyID, type_gap),
 					  member_type, &member_type, type_gap);
 	return get_dict_type(member_type, type_gap);
     }
@@ -372,9 +380,9 @@ need_convert_to_bool(type_T *type, typval_T *tv)
  * "type_list" is used to temporarily create types in.
  */
     type_T *
-typval2type(typval_T *tv, garray_T *type_gap)
+typval2type(typval_T *tv, int copyID, garray_T *type_gap)
 {
-    type_T *type = typval2type_int(tv, type_gap);
+    type_T *type = typval2type_int(tv, copyID, type_gap);
 
     if (type != NULL && type != &t_bool
 	    && (tv->v_type == VAR_NUMBER
@@ -396,7 +404,7 @@ typval2type_vimvar(typval_T *tv, garray_T *type_gap)
 	return &t_list_string;
     if (tv->v_type == VAR_DICT)  // e.g. for v:completed_item
 	return &t_dict_any;
-    return typval2type(tv, type_gap);
+    return typval2type(tv, get_copyID(), type_gap);
 }
 
     int
@@ -421,7 +429,7 @@ check_typval_type(type_T *expected, typval_T *actual_tv, where_T where)
     int		res = FAIL;
 
     ga_init2(&type_list, sizeof(type_T *), 10);
-    actual_type = typval2type(actual_tv, &type_list);
+    actual_type = typval2type(actual_tv, get_copyID(), &type_list);
     if (actual_type != NULL)
 	res = check_type(expected, actual_type, TRUE, where);
     clear_type_list(&type_list);
@@ -1202,7 +1210,7 @@ f_typename(typval_T *argvars, typval_T *rettv)
 
     rettv->v_type = VAR_STRING;
     ga_init2(&type_list, sizeof(type_T *), 10);
-    type = typval2type(argvars, &type_list);
+    type = typval2type(argvars, get_copyID(), &type_list);
     name = type_name(type, &tofree);
     if (tofree != NULL)
 	rettv->vval.v_string = (char_u *)tofree;