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diff --git a/src/vhdl/vhdl-parse.ads b/src/vhdl/vhdl-parse.ads
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+--  VHDL parser.
+--  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 Types; use Types;
+with Iirs; use Iirs;
+
+package Vhdl.Parse is
+   --  If True, create nodes for parenthesis expressions.
+   Flag_Parse_Parenthesis : Boolean := False;
+
+   type Prio_Type is
+     (
+      Prio_Expression,
+      Prio_Logical,
+      Prio_Relation,
+      Prio_Shift,
+      Prio_Simple,
+      Prio_Term,
+      Prio_Factor
+     );
+
+   --  Parse an expression.
+   --  (Used by PSL).
+   function Parse_Expression (Prio : Prio_Type := Prio_Expression) return Iir;
+   function Parse_Binary_Expression (Left : Iir; Prio : Prio_Type) return Iir;
+
+   --  Convert the STR (0 .. LEN - 1) into a operator symbol identifier.
+   --  Emit an error message if the name is not an operator name.
+   function Str_To_Operator_Name (Str_Id : String8_Id;
+                                  Len : Nat32;
+                                  Loc : Location_Type) return Name_Id;
+
+   --  Convert string literal STR to an operator symbol.
+   --  Emit an error message if the string is not an operator name.
+   function String_To_Operator_Symbol (Str : Iir) return Iir;
+
+   --  Parse a single design unit.
+   --  The scanner must have been initialized, however, the current_token
+   --  shouldn't have been set.
+   --  At return, the last token accepted is the semi_colon that terminates
+   --  the library unit.
+   --  Return Null_Iir when end of file.
+   function Parse_Design_Unit return Iir_Design_Unit;
+
+   --  Parse a file.
+   --  The scanner must have been initialized as for parse_design_unit.
+   --  Return Null_Iir in case of error.
+   function Parse_Design_File return Iir_Design_File;
+end Vhdl.Parse;