begin
-- If the assignment is dispatching, make sure to use the
- -- ??? where is rest of this comment ???
+ -- proper type.
if Is_Class_Wide_Type (Typ) then
F_Typ := Class_Wide_Type (F_Typ);
end if;
- L := New_List (
+ L := New_List;
+
+ -- In case of assignment to a class-wide tagged type, before
+ -- the assignment we generate run-time check to ensure that
+ -- the tag of the Target is covered by the tag of the source
+
+ if Is_Class_Wide_Type (Typ)
+ and then Is_Tagged_Type (Typ)
+ and then Is_Tagged_Type (Underlying_Type (Etype (Rhs)))
+ then
+ Append_To (L,
+ Make_Raise_Constraint_Error (Loc,
+ Condition =>
+ Make_Op_Not (Loc,
+ Make_Function_Call (Loc,
+ Name => New_Reference_To
+ (RTE (RE_CW_Membership), Loc),
+ Parameter_Associations => New_List (
+ Make_Selected_Component (Loc,
+ Prefix =>
+ Duplicate_Subexpr (Lhs),
+ Selector_Name =>
+ Make_Identifier (Loc, Name_uTag)),
+ Make_Selected_Component (Loc,
+ Prefix =>
+ Duplicate_Subexpr (Rhs),
+ Selector_Name =>
+ Make_Identifier (Loc, Name_uTag))))),
+ Reason => CE_Tag_Check_Failed));
+ end if;
+
+ Append_To (L,
Make_Procedure_Call_Statement (Loc,
Name => New_Reference_To (Op, Loc),
Parameter_Associations => New_List (