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diff --git a/src/vhdl/canon.ads b/src/vhdl/canon.ads
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+--  Canonicalization pass
+--  Copyright (C) 2002, 2003, 2004, 2005 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 Iirs; use Iirs;
+
+package Canon is
+   --  If true, a label will be added for statements which do not have a
+   --  label.
+   Canon_Flag_Add_Labels : Boolean := False;
+
+   --  If true, canon sequentials statements (processes and subprograms).
+   Canon_Flag_Sequentials_Stmts : Boolean := False;
+
+   --  If true, canon expressions.
+   Canon_Flag_Expressions : Boolean := False;
+
+   --  If true, replace 'all' sensitivity list by the explicit list
+   --  (If true, Canon_Flag_Sequentials_Stmts must be true)
+   Canon_Flag_All_Sensitivity : Boolean := False;
+
+   --  If true, operands of type array element of a concatenation operator
+   --  are converted (by an aggregate) into array.
+   Canon_Concatenation : Boolean := False;
+
+   -- Do canonicalization:
+   --  Transforms concurrent statements into sensitized process statements
+   --   (all but component instanciation and block).
+   --  This computes sensivity list.
+   --
+   --  Association list are completed:
+   --  * Formal are added.
+   --  * association are created for formal not associated (actual is open).
+   --  * an association is created (for block header only).
+   procedure Canonicalize (Unit: Iir_Design_Unit);
+
+   --  Create a default configuration declaration for architecture ARCH.
+   function Create_Default_Configuration_Declaration
+     (Arch : Iir_Architecture_Body)
+     return Iir_Design_Unit;
+
+   --  Canonicalize a subprogram call.
+   procedure Canon_Subprogram_Call (Call : Iir);
+
+   -- Compute the sensivity list of EXPR and add it to SENSIVITY_LIST.
+   -- If IS_TARGET is true, the longuest static prefix of the signal name
+   -- is not added to the sensitivity list, but other static prefix (such
+   -- as indexes of an indexed name) are added.
+   procedure Canon_Extract_Sensitivity
+     (Expr: Iir; Sensitivity_List: Iir_List; Is_Target: Boolean := False);
+
+   --  Compute the sensitivity list of all-sensitized process PROC.
+   --  Used for vhdl 08.
+   function Canon_Extract_Process_Sensitivity
+     (Proc : Iir_Sensitized_Process_Statement)
+     return Iir_List;
+end Canon;