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diff --git a/src/vhdl/flists.ads b/src/vhdl/flists.ads
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+--  Fixed-length lists.
+--  Copyright (C) 2017 Tristan Gingold
+--
+--  GHDL is free software; you can redistribute it and/or modify it under
+--  the terms of the GNU General Public License as published by the Free
+--  Software Foundation; either version 2, or (at your option) any later
+--  version.
+--
+--  GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+--  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+--  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+--  for more details.
+--
+--  You should have received a copy of the GNU General Public License
+--  along with GHDL; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+with Types; use Types;
+with Nodes; use Nodes;
+
+package Flists is
+   type Flist_Type is new Int32;
+   for Flist_Type'Size use 32;
+
+   --  Non-existing flist.
+   Null_Flist : constant Flist_Type := 0;
+
+   --  Predefined special flist that could be used as a marker.
+   Flist_Others : constant Flist_Type := 1;
+   Flist_All : constant Flist_Type := 2;
+
+   --  Create a new flist of length LEN.  All the elements are initialized to
+   --  Null_Node.
+   function Create_Flist (Len : Natural) return Flist_Type;
+
+   --  Deallocate FLIST.  Set to Null_Flist.
+   procedure Destroy_Flist (Flist : in out Flist_Type);
+
+   --  First and last index of FLIST.  Could be used to iterate.
+   Ffirst : constant Natural := 0;
+   function Flast (Flist : Flist_Type) return Natural;
+
+   --  Return the length of FLIST.
+   function Length (Flist : Flist_Type) return Natural;
+
+   --  Get the N-th element of FLIST.  First element has index 0.
+   function Get_Nth_Element (Flist : Flist_Type; N : Natural) return Node_Type;
+
+   --  Set the N-th element of FLIST to V.
+   procedure Set_Nth_Element (Flist : Flist_Type; N : Natural; V : Node_Type);
+end Flists;