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diff --git a/src/vhdl/iirs_walk.ads b/src/vhdl/iirs_walk.ads
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+--  Walk in iirs nodes.
+--  Copyright (C) 2009 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 GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+
+with Iirs; use Iirs;
+
+package Iirs_Walk is
+   type Walk_Status is
+     (
+      --  Continue to walk.
+      Walk_Continue,
+
+      --  Stop walking in the subtree, continue in the parent tree.
+      Walk_Up,
+
+      --  Abort the walk.
+      Walk_Abort);
+
+   type Walk_Cb is access function (El : Iir) return Walk_Status;
+
+   --  Walk on all elements of CHAIN.
+   function Walk_Chain (Chain : Iir; Cb : Walk_Cb) return Walk_Status;
+
+
+   function Walk_Assignment_Target (Target : Iir; Cb : Walk_Cb)
+                                   return Walk_Status;
+
+   --  Walk on all stmts and sub-stmts of CHAIN.
+   function Walk_Sequential_Stmt_Chain (Chain : Iir; Cb : Walk_Cb)
+                                       return Walk_Status;
+end Iirs_Walk;