Move sources to src/ subdirectory.

2 files changed, 2720 insertions, 0 deletions

diff --git a/src/ortho/oread/Makefile b/src/ortho/oread/Makefile
new file mode 100644
index 0000000..f945351
--- /dev/null
+++ b/src/ortho/oread/Makefile
@@ -0,0 +1,43 @@
+#  -*- Makefile -*- for the ortho-code compiler.
+#  Copyright (C) 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 GCC; see the file COPYING.  If not, write to the Free
+#  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+#  02111-1307, USA.
+BE = gcc
+ortho_srcdir=..
+BACK_END=$(ortho_srcdir)/$(BE)
+ortho_exec=oread-$(BE)
+
+all: $(ortho_exec)
+
+test: test.s
+	$(CC) -o $@ $^
+
+test.s: $(ortho_exec)
+	./$(ortho_exec) test
+
+$(ortho_exec): force
+	$(MAKE) -f $(BACK_END)/Makefile ortho_exec=$(ortho_exec)
+
+clean:
+	$(MAKE) -f $(BACK_END)/Makefile clean
+	$(RM) -f oread-gcc oread-mcode *.o *~
+
+distclean: clean
+	$(MAKE) -f $(BACK_END)/Makefile distclean
+
+force:
+
+.PHONY: force
diff --git a/src/ortho/oread/ortho_front.adb b/src/ortho/oread/ortho_front.adb
new file mode 100644
index 0000000..84bbd1b
--- /dev/null
+++ b/src/ortho/oread/ortho_front.adb
@@ -0,0 +1,2677 @@
+--  Ortho code compiler.
+--  Copyright (C) 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 GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+with Ada.Unchecked_Deallocation;
+with Ortho_Nodes; use Ortho_Nodes;
+with Ortho_Ident; use Ortho_Ident;
+with Ada.Characters.Latin_1; use Ada.Characters.Latin_1;
+with GNAT.OS_Lib; use GNAT.OS_Lib;
+with Interfaces; use Interfaces;
+with Ada.Exceptions;
+--with GNAT.Debug_Pools;
+
+--  TODO:
+--  uncomplete type: check for type redefinition
+
+package body Ortho_Front is
+   --  If true, emit line number before each statement.
+   --  If flase, keep line number indication in the source file.
+   Flag_Renumber : Boolean := True;
+
+   procedure Init is
+   begin
+      null;
+   end Init;
+
+   function Decode_Option (Opt : String_Acc; Arg : String_Acc) return Natural
+   is
+      pragma Unreferenced (Arg);
+   begin
+      if Opt.all = "-r" or Opt.all = "--ghdl-r" then
+         Flag_Renumber := True;
+         return 1;
+      else
+         return 0;
+      end if;
+   end Decode_Option;
+
+   --  File buffer.
+   File_Name : String_Acc;
+   Buf : String (1 .. 2048 + 1);
+   Buf_Len : Natural;
+   Pos : Natural;
+   Lineno : Natural;
+
+   Fd : File_Descriptor;
+
+   Error : exception;
+
+   procedure Puterr (Msg : String)
+   is
+      L : Integer;
+      pragma Unreferenced (L);
+   begin
+      L := Write (Standerr, Msg'Address, Msg'Length);
+   end Puterr;
+
+   procedure Puterr (N : Natural)
+   is
+      Str : constant String := Natural'Image (N);
+   begin
+      Puterr (Str (Str'First + 1 .. Str'Last));
+   end Puterr;
+
+   procedure Newline_Err is
+   begin
+      Puterr ((1 => LF));
+   end Newline_Err;
+
+   procedure Scan_Error (Msg : String) is
+   begin
+      Puterr (File_Name.all);
+      Puterr (":");
+      Puterr (Lineno);
+      Puterr (": ");
+      Puterr (Msg);
+      Newline_Err;
+      raise Error;
+   end Scan_Error;
+
+   procedure Parse_Error (Msg : String);
+   pragma No_Return (Parse_Error);
+
+   procedure Parse_Error (Msg : String) is
+   begin
+      Puterr (File_Name.all);
+      Puterr (":");
+      Puterr (Lineno);
+      Puterr (": ");
+      Puterr (Msg);
+      Newline_Err;
+      raise Error;
+   end Parse_Error;
+
+
+--    Uniq_Num : Natural := 0;
+
+--    function Get_Uniq_Id return O_Ident
+--    is
+--       Str : String (1 .. 8);
+--       V : Natural;
+--    begin
+--       V := Uniq_Num;
+--       Uniq_Num := Uniq_Num + 1;
+--       Str (1) := 'L';
+--       Str (2) := '.';
+--       for I in reverse 3 .. Str'Last loop
+--          Str (I) := Character'Val ((V mod 10) + Character'Pos('0'));
+--          V := V / 10;
+--       end loop;
+--       return Get_Identifier (Str);
+--    end Get_Uniq_Id;
+
+   --  Get the next character.
+   --  Return NUL on end of file.
+   function Get_Char return Character
+   is
+      Res : Character;
+   begin
+      if Buf (Pos) = NUL then
+         --  Read line.
+         Buf_Len := Read (Fd, Buf'Address, Buf'Length - 1);
+         if Buf_Len = 0 then
+            --  End of file.
+            return NUL;
+         end if;
+         Pos := 1;
+         Buf (Buf_Len + 1) := NUL;
+      end if;
+
+      Res := Buf (Pos);
+      Pos := Pos + 1;
+      return Res;
+   end Get_Char;
+
+   procedure Unget_Char is
+   begin
+      if Pos = Buf'First then
+         raise Program_Error;
+      end if;
+      Pos := Pos - 1;
+   end Unget_Char;
+
+   type Token_Type is
+      (Tok_Eof,
+       Tok_Line_Number, Tok_File_Name, Tok_Comment,
+       Tok_Ident, Tok_Num, Tok_String, Tok_Float_Num,
+       Tok_Plus, Tok_Minus,
+       Tok_Star, Tok_Div, Tok_Mod, Tok_Rem,
+       Tok_Sharp,
+       Tok_Not, Tok_Abs,
+       Tok_Or, Tok_And, Tok_Xor,
+       Tok_Equal, Tok_Not_Equal,
+       Tok_Greater, Tok_Greater_Eq,
+       Tok_Less, Tok_Less_Eq,
+       Tok_Colon, Tok_Semicolon,
+       Tok_Comma, Tok_Dot, Tok_Tick, Tok_Arob, Tok_Elipsis,
+       Tok_Assign,
+       Tok_Left_Paren, Tok_Right_Paren,
+       Tok_Left_Brace, Tok_Right_Brace,
+       Tok_Left_Brack, Tok_Right_Brack,
+       Tok_Unsigned, Tok_Signed, Tok_Float,
+       Tok_Array, Tok_Subarray,
+       Tok_Access, Tok_Record, Tok_Union,
+       Tok_Boolean, Tok_Enum,
+       Tok_If, Tok_Then, Tok_Else, Tok_Elsif,
+       Tok_Loop, Tok_Exit, Tok_Next,
+       Tok_Is, Tok_Of, Tok_All,
+       Tok_Return,
+       Tok_Type,
+       Tok_External, Tok_Private, Tok_Public, Tok_Local,
+       Tok_Procedure, Tok_Function,
+       Tok_Constant, Tok_Var,
+       Tok_Declare, Tok_Begin, Tok_End,
+       Tok_Case, Tok_When, Tok_Default, Tok_Arrow,
+       Tok_Null);
+
+   type Hash_Type is new Unsigned_32;
+
+   type Name_Type;
+   type Name_Acc is access Name_Type;
+
+   --  Symbol table.
+   type Syment_Type;
+   type Syment_Acc is access Syment_Type;
+   type Syment_type is record
+      --  The hash for the symbol.
+      Hash : Hash_Type;
+      --  Identification of the symbol.
+      Ident : O_Ident;
+      --  Next symbol with the same collision.
+      Next : Syment_Acc;
+      --  Meaning of the symbol.
+      Name : Name_Acc;
+   end record;
+
+   --  Well known identifiers (used for attributes).
+   Id_Address : Syment_Acc;
+   Id_Unchecked_Address : Syment_Acc;
+   Id_Subprg_Addr : Syment_Acc;
+   Id_Conv : Syment_Acc;
+   Id_Sizeof : Syment_Acc;
+   Id_Alignof : Syment_Acc;
+   Id_Alloca : Syment_Acc;
+   Id_Offsetof : Syment_Acc;
+
+   Token_Number : Unsigned_64;
+   Token_Float : IEEE_Float_64;
+   Token_Ident : String (1 .. 256);
+   Token_Idlen : Natural;
+   Token_Hash : Hash_Type;
+   Token_Sym : Syment_Acc;
+
+   --  The symbol table.
+   type Syment_Acc_Array is array (Hash_Type range <>) of Syment_Acc;
+   Hash_Max : constant Hash_Type := 511;
+   Symtable : Syment_Acc_Array (0 .. Hash_Max - 1) := (others => null);
+
+   type Node_Kind is (Decl_Keyword, Decl_Type, Decl_Param,
+                      Node_Function, Node_Procedure, Node_Object, Node_Field,
+                      Node_Lit,
+                      Type_Boolean, Type_Enum,
+                      Type_Unsigned, Type_Signed, Type_Float,
+                      Type_Array, Type_Subarray,
+                      Type_Access, Type_Record, Type_Union);
+   subtype Nodes_Subprogram is Node_Kind range Node_Function .. Node_Procedure;
+
+   type Node (<>);
+   type Node_Acc is access Node;
+   type Node (Kind : Node_Kind) is record
+      case Kind is
+         when Decl_Keyword =>
+            --  Keyword.
+            --  A keyword is not a declaration since the identifier has only
+            --  one meaning (the keyword).
+            Keyword : Token_Type;
+         when Decl_Type
+           | Decl_Param
+           | Node_Function
+           | Node_Procedure
+           | Node_Object
+           | Node_Lit =>
+            --  Declarations
+            --  All declarations but NODE_PROCEDURE have a type.
+            Decl_Dtype : Node_Acc;
+            Decl_Storage : O_Storage;
+            case Kind is
+               when Decl_Type =>
+                  --  Type declaration.
+                  null;
+               when Decl_Param =>
+                  --  Parameter identifier.
+                  Param_Name : Syment_Acc;
+                  --  Parameter ortho node.
+                  Param_Node : O_Dnode;
+                  --  Next parameter of the parameters list.
+                  Param_Next : Node_Acc;
+               when Node_Procedure
+                 | Node_Function =>
+                  --  Subprogram symbol name.
+                  Subprg_Name : Syment_Acc;
+                  --  List of parameters.
+                  Subprg_Params : Node_Acc;
+                  --  Subprogram ortho node.
+                  Subprg_Node : O_Dnode;
+               when Node_Object =>
+                  --  Name of the object (constant, variable).
+                  Obj_Name : O_Ident;
+                  --  Ortho node of the object.
+                  Obj_Node : O_Dnode;
+               when Node_Lit =>
+                  --  Name of the literal.
+                  Lit_Name : O_Ident;
+                  --  Enum literal
+                  Lit_Cnode : O_Cnode;
+                  --  Next literal for the type.
+                  Lit_Next : Node_Acc;
+               when others =>
+                  null;
+            end case;
+         when Node_Field =>
+            --  Record field.
+            Field_Ident : Syment_Acc;
+            Field_Fnode : O_Fnode;
+            Field_Type : Node_Acc;
+            Field_Next : Node_Acc;
+         when Type_Signed
+           | Type_Unsigned
+           | Type_Float
+           | Type_Array
+           | Type_Subarray
+           | Type_Record
+           | Type_Union
+           | Type_Access
+           | Type_Boolean
+           | Type_Enum =>
+            --  Ortho node type.
+            Type_Onode : O_Tnode;
+            case Kind is
+               when Type_Array =>
+                  Array_Index : Node_Acc;
+                  Array_Element : Node_Acc;
+               when Type_Subarray =>
+                  Subarray_Base : Node_Acc;
+                  --Subarray_Length : Natural;
+               when Type_Access =>
+                  Access_Dtype : Node_Acc;
+               when Type_Record
+                 | Type_Union =>
+                  Record_Union_Fields : Node_Acc;
+               when Type_Enum
+                 | Type_Boolean =>
+                  Enum_Lits : Node_Acc;
+               when Type_Float =>
+                  null;
+               when others =>
+                  null;
+            end case;
+      end case;
+   end record;
+
+   type Scope_Type;
+   type Scope_Acc is access Scope_Type;
+
+   type Name_Type is record
+      --  Current interpretation of the symbol.
+      Inter : Node_Acc;
+      --  Next declaration in the current scope.
+      Next : Syment_Acc;
+      --  Interpretation in a previous scope.
+      Up : Name_Acc;
+      --  Current scope.
+      Scope : Scope_Acc;
+   end record;
+
+   type Scope_Type is record
+      --  Simply linked list of names.
+      Names : Syment_Acc;
+      --  Previous scope.
+      Prev : Scope_Acc;
+   end record;
+
+   --  Return the current declaration for symbol SYM.
+   function Get_Decl (Sym : Syment_Acc) return Node_Acc;
+   pragma Inline (Get_Decl);
+
+   procedure Scan_Char (C : Character)
+   is
+      R : Character;
+   begin
+
+      if C = '\' then
+         R := Get_Char;
+         case R is
+            when 'n' =>
+               R := LF;
+            when 'r' =>
+               R := CR;
+            when ''' =>
+               R := ''';
+            when '"' => -- "
+               R := '"'; -- "
+            when others =>
+               Scan_Error ("bad character sequence \" & R);
+         end case;
+      else
+         R := C;
+      end if;
+      Token_Idlen := Token_Idlen + 1;
+      Token_Ident (Token_Idlen) := R;
+   end Scan_Char;
+
+   function Get_Hash (Str : String) return Hash_Type
+   is
+      Res : Hash_Type;
+   begin
+      Res := 0;
+      for I in Str'Range loop
+         Res := Res * 31 + Character'Pos (Str (I));
+      end loop;
+      return Res;
+   end Get_Hash;
+
+   --  Previous token.
+   Tok_Previous : Token_Type;
+
+   function Scan_Number (First_Char : Character) return Token_Type
+   is
+      function To_Digit (C : Character) return Integer is
+      begin
+         case C is
+            when '0' .. '9' =>
+               return Character'Pos (C) - Character'Pos ('0');
+            when 'A' .. 'F' =>
+               return Character'Pos (C) - Character'Pos ('A') + 10;
+            when 'a' .. 'f' =>
+               return Character'Pos (C) - Character'Pos ('a') + 10;
+            when others =>
+               return -1;
+         end case;
+      end To_Digit;
+
+      function Is_Digit (C : Character) return Boolean is
+      begin
+         case C is
+            when '0' .. '9'
+              | 'A' .. 'F'
+              | 'a' .. 'f' =>
+               return True;
+            when others =>
+               return False;
+         end case;
+      end Is_Digit;
+
+      After_Point : Integer;
+      C : Character;
+      Exp : Integer;
+      Exp_Neg : Boolean;
+      Base : Unsigned_64;
+   begin
+      Token_Number := 0;
+      C := First_Char;
+      loop
+         Token_Number := Token_Number * 10 + Unsigned_64 (To_Digit (C));
+         C := Get_Char;
+         exit when not Is_Digit (C);
+      end loop;
+      if C = '#' then
+         Base := Token_Number;
+         Token_Number := 0;
+         C := Get_Char;
+         loop
+            Token_Number := Token_Number * Base + Unsigned_64 (To_Digit (C));
+            C := Get_Char;
+            exit when C = '#';
+         end loop;
+         return Tok_Num;
+      end if;
+      if C = '.' then
+         -- A real number.
+         After_Point := 0;
+         Token_Float := IEEE_Float_64 (Token_Number);
+         loop
+            C := Get_Char;
+            exit when C not in '0' .. '9';
+            Token_Float := Token_Float * 10.0 + IEEE_Float_64 (To_Digit (C));
+            After_Point := After_Point + 1;
+         end loop;
+         if C = 'e' or C = 'E' then
+            Exp := 0;
+            C := Get_Char;
+            Exp_Neg := False;
+            if C = '-' then
+               Exp_Neg := True;
+               C := Get_Char;
+            elsif C = '+' then
+               C := Get_Char;
+            elsif not Is_Digit (C) then
+               Scan_Error ("digit expected");
+            end if;
+            while Is_Digit (C) loop
+               Exp := Exp * 10 + To_Digit (C);
+               C := Get_Char;
+            end loop;
+            if Exp_Neg then
+               Exp := -Exp;
+            end if;
+            Exp := Exp - After_Point;
+         else
+            Exp := - After_Point;
+         end if;
+         Unget_Char;
+         Token_Float := Token_Float * 10.0 ** Exp;
+         if Token_Float > IEEE_Float_64'Last then
+            Token_Float := IEEE_Float_64'Last;
+         end if;
+         return Tok_Float_Num;
+      else
+         Unget_Char;
+         return Tok_Num;
+      end if;
+   end Scan_Number;
+
+   procedure Scan_Comment
+   is
+      C : Character;
+   begin
+      Token_Idlen := 0;
+      loop
+         C := Get_Char;
+         exit when C = CR or C = LF;
+         Token_Idlen := Token_Idlen + 1;
+         Token_Ident (Token_Idlen) := C;
+      end loop;
+      Unget_Char;
+   end Scan_Comment;
+
+   --  Get the next token.
+   function Get_Token return Token_Type
+   is
+      C : Character;
+   begin
+      loop
+
+         C := Get_Char;
+         << Again >> null;
+         case C is
+            when NUL =>
+               return Tok_Eof;
+            when ' ' | HT =>
+               null;
+            when LF =>
+               Lineno := Lineno + 1;
+               C := Get_Char;
+               if C /= CR then
+                  goto Again;
+               end if;
+            when CR =>
+               Lineno := Lineno + 1;
+               C := Get_Char;
+               if C /= LF then
+                  goto Again;
+               end if;
+            when '+' =>
+               return Tok_Plus;
+            when '-' =>
+               C := Get_Char;
+               if C = '-' then
+                  C := Get_Char;
+                  if C = '#' then
+                     return Tok_Line_Number;
+                  elsif C = 'F' then
+                     Scan_Comment;
+                     return Tok_File_Name;
+                  elsif C = ' ' then
+                     Scan_Comment;
+                     return Tok_Comment;
+                  else
+                     Scan_Error ("bad comment");
+                  end if;
+               else
+                  Unget_Char;
+                  return Tok_Minus;
+               end if;
+            when '/' =>
+               C := Get_Char;
+               if C = '=' then
+                  return Tok_Not_Equal;
+               else
+                  Unget_Char;
+                  return Tok_Div;
+               end if;
+            when '*' =>
+               return Tok_Star;
+            when '#' =>
+               return Tok_Sharp;
+            when '=' =>
+               C := Get_Char;
+               if C = '>' then
+                  return Tok_Arrow;
+               else
+                  Unget_Char;
+                  return Tok_Equal;
+               end if;
+            when '>' =>
+               C := Get_Char;
+               if C = '=' then
+                  return Tok_Greater_Eq;
+               else
+                  Unget_Char;
+                  return Tok_Greater;
+               end if;
+            when '(' =>
+               return Tok_Left_Paren;
+            when ')' =>
+               return Tok_Right_Paren;
+            when '{' =>
+               return Tok_Left_Brace;
+            when '}' =>
+               return Tok_Right_Brace;
+            when '[' =>
+               return Tok_Left_Brack;
+            when ']' =>
+               return Tok_Right_Brack;
+            when '<' =>
+               C := Get_Char;
+               if C = '=' then
+                  return Tok_Less_Eq;
+               else
+                  Unget_Char;
+                  return Tok_Less;
+               end if;
+            when ':' =>
+               C := Get_Char;
+               if C = '=' then
+                  return Tok_Assign;
+               else
+                  Unget_Char;
+                  return Tok_Colon;
+               end if;
+            when '.' =>
+               C := Get_Char;
+               if C = '.' then
+                  C := Get_Char;
+                  if C = '.' then
+                     return Tok_Elipsis;
+                  else
+                     Scan_Error ("'...' expected");
+                  end if;
+               else
+                  Unget_Char;
+                  return Tok_Dot;
+               end if;
+            when ';' =>
+               return Tok_Semicolon;
+            when ',' =>
+               return Tok_Comma;
+            when '@' =>
+               return Tok_Arob;
+            when ''' =>
+               if Tok_Previous = Tok_Ident then
+                  return Tok_Tick;
+               else
+                  Token_Number := Character'Pos (Get_Char);
+                  C := Get_Char;
+                  if C /= ''' then
+                     Scan_Error ("ending single quote expected");
+                  end if;
+                  return Tok_Num;
+               end if;
+            when '"' => -- "
+               --  Eat double quote.
+               C := Get_Char;
+               Token_Idlen := 0;
+               loop
+                  Scan_Char (C);
+                  C := Get_Char;
+                  exit when C = '"'; -- "
+               end loop;
+               return Tok_String;
+            when '0' .. '9' =>
+               return Scan_Number (C);
+            when 'a' .. 'z'
+              | 'A' .. 'Z'
+              | '_' =>
+               Token_Idlen := 0;
+               Token_Hash := 0;
+               loop
+                  Token_Idlen := Token_Idlen + 1;
+                  Token_Ident (Token_Idlen) := C;
+                  Token_Hash := Token_Hash * 31 + Character'Pos (C);
+                  C := Get_Char;
+                  exit when (C < 'A' or C > 'Z')
+                    and (C < 'a' or C > 'z')
+                    and (C < '0' or C > '9')
+                    and (C /= '_');
+               end loop;
+               Unget_Char;
+               declare
+                  H : Hash_Type;
+                  S : Syment_Acc;
+                  N : Node_Acc;
+               begin
+                  H := Token_Hash mod Hash_Max;
+                  S := Symtable (H);
+                  while S /= null loop
+                     if S.Hash = Token_Hash
+                       and then Is_Equal (S.Ident,
+                                          Token_Ident (1 .. Token_Idlen))
+                     then
+                        --  This identifier is known.
+                        Token_Sym := S;
+
+                        --  It may be a keyword.
+                        if S.Name /= null then
+                           N := Get_Decl (S);
+                           if N.Kind = Decl_Keyword then
+                              return N.Keyword;
+                           end if;
+                        end if;
+
+                        return Tok_Ident;
+                     end if;
+                     S := S.Next;
+                  end loop;
+                  Symtable (H) := new Syment_Type'
+                    (Hash => Token_Hash,
+                     Ident => Get_Identifier (Token_Ident (1 .. Token_Idlen)),
+                     Next => Symtable (H),
+                     Name => null);
+                  Token_Sym := Symtable (H);
+                  return Tok_Ident;
+               end;
+            when others =>
+               Scan_Error ("Bad character:"
+                           & Integer'Image (Character'Pos (C))
+                           & C);
+               return Tok_Eof;
+         end case;
+      end loop;
+   end Get_Token;
+
+   --  The current token.
+   Tok : Token_Type;
+
+   procedure Next_Token is
+   begin
+      Tok_Previous := Tok;
+      Tok := Get_Token;
+   end Next_Token;
+
+   procedure Expect (T : Token_Type; Msg : String := "") is
+   begin
+      if Tok /= T then
+         if Msg'Length = 0 then
+            case T is
+               when Tok_Left_Brace =>
+                  Parse_Error ("'{' expected");
+               when others =>
+                  if Tok = Tok_Ident then
+                     Parse_Error
+                       (Token_Type'Image (T) & " expected, found '" &
+                        Token_Ident (1 .. Token_Idlen) & "'");
+                  else
+                     Parse_Error (Token_Type'Image (T) & " expected, found "
+                                  & Token_Type'Image (Tok));
+                  end if;
+            end case;
+         else
+            Parse_Error (Msg);
+         end if;
+      end if;
+   end Expect;
+
+   procedure Next_Expect (T : Token_Type; Msg : String := "") is
+   begin
+      Next_Token;
+      Expect (T, Msg);
+   end Next_Expect;
+
+   --  Scopes and identifiers.
+
+
+   --  Current scope.
+   Scope : Scope_Acc := null;
+
+   --  Add a declaration for symbol SYM in the current scope.
+   --  INTER defines the meaning of the declaration.
+   --  There must be at most one declaration for a symbol in the current scope,
+   --  i.e. a symbol cannot be redefined.
+   procedure Add_Decl (Sym : Syment_Acc; Inter : Node_Acc);
+
+   --  Return TRUE iff SYM is already defined in the current scope.
+   function Is_Defined (Sym : Syment_Acc) return Boolean;
+
+   --  Create new scope.
+   procedure Push_Scope;
+
+   --  Close the current scope.  Symbols defined in the scope regain their
+   --  previous declaration.
+   procedure Pop_Scope;
+
+
+   procedure Push_Scope
+   is
+      Nscope : Scope_Acc;
+   begin
+      Nscope := new Scope_Type'(Names => null, Prev => Scope);
+      Scope := Nscope;
+   end Push_Scope;
+
+   procedure Pop_Scope
+   is
+      procedure Free is new Ada.Unchecked_Deallocation
+        (Object => Name_Type, Name => Name_Acc);
+
+      procedure Free is new Ada.Unchecked_Deallocation
+        (Object => Scope_Type, Name => Scope_Acc);
+
+      Sym : Syment_Acc;
+      N_Sym : Syment_Acc;
+      Name : Name_Acc;
+      Old_Scope : Scope_Acc;
+   begin
+      Sym := Scope.Names;
+      while Sym /= null loop
+         Name := Sym.Name;
+         --  Check.
+         if Name.Scope /= Scope then
+            raise Program_Error;
+         end if;
+
+         --  Set the interpretation of this symbol.
+         Sym.Name := Name.Up;
+
+         N_Sym := Name.Next;
+
+         Free (Name);
+         Sym := N_Sym;
+      end loop;
+
+      --  Free scope.
+      Old_Scope := Scope;
+      Scope := Scope.Prev;
+      Free (Old_Scope);
+   end Pop_Scope;
+
+   function Is_Defined (Sym : Syment_Acc) return Boolean is
+   begin
+      if Sym.Name /= null
+        and then Sym.Name.Scope = Scope
+      then
+         return True;
+      else
+         return False;
+      end if;
+   end Is_Defined;
+
+   function New_Symbol (Str : String) return Syment_Acc
+   is
+      Ent : Syment_Acc;
+      H : Hash_Type;
+   begin
+      Ent := new Syment_Type'(Hash => Get_Hash (Str),
+                              Ident => Get_Identifier (Str),
+                              Next => null,
+                              Name => null);
+      H := Ent.Hash mod Hash_Max;
+      Ent.Next := Symtable (H);
+      Symtable (H) := Ent;
+      return Ent;
+   end New_Symbol;
+
+   procedure Add_Keyword (Str : String; Token : Token_Type)
+   is
+      Ent : Syment_Acc;
+   begin
+      Ent := New_Symbol (Str);
+      if Ent.Name /= null
+        or else Scope /= null
+      then
+         --  Redefinition of a keyword.
+         raise Program_Error;
+      end if;
+      Ent.Name := new Name_Type'(Inter => new Node'(Kind => Decl_Keyword,
+                                                    Keyword => Token),
+                                 Next => null,
+                                 Up => null,
+                                 Scope => null);
+   end Add_Keyword;
+
+   procedure Add_Decl (Sym : Syment_Acc; Inter : Node_Acc)
+   is
+      Name : Name_Acc;
+      Prev : Node_Acc;
+   begin
+      Name := Sym.Name;
+      if Name /= null and then Name.Scope = Scope then
+         Prev := Name.Inter;
+         if Prev.Kind = Inter.Kind
+           and then Prev.Decl_Dtype = Inter.Decl_Dtype
+           and then Prev.Decl_Storage = O_Storage_External
+           and then Inter.Decl_Storage = O_Storage_Public
+         then
+            --  Redefinition
+            Name.Inter := Inter;
+            return;
+         end if;
+         Parse_Error ("redefinition of " & Get_String (Sym.Ident));
+      end if;
+      Name := new Name_Type'(Inter => Inter,
+                             Next => Scope.Names,
+                             Up => Sym.Name,
+                             Scope => Scope);
+      Sym.Name := Name;
+      Scope.Names := Sym;
+   end Add_Decl;
+
+   function Get_Decl (Sym : Syment_Acc) return Node_Acc is
+   begin
+      if Sym.Name = null then
+         Parse_Error ("undefined identifier " & Get_String (Sym.Ident));
+      else
+         return Sym.Name.Inter;
+      end if;
+   end Get_Decl;
+
+   function Parse_Constant_Value (Atype : Node_Acc) return O_Cnode;
+   function Parse_Address (Prefix : Node_Acc) return O_Enode;
+   function Parse_Constant_Address (Prefix : Node_Acc) return O_Cnode;
+   procedure Parse_Declaration;
+   procedure Parse_Compound_Statement;
+
+   function Parse_Type return Node_Acc;
+
+   procedure Parse_Fields (Aggr_Type : Node_Acc;
+                           Constr : in out O_Element_List)
+   is
+      F_Type : Node_Acc;
+      F : Syment_Acc;
+      Last_Field : Node_Acc;
+      Field : Node_Acc;
+   begin
+      Last_Field := null;
+      loop
+         exit when Tok = Tok_End;
+
+         if Tok /= Tok_Ident then
+            Parse_Error ("field name expected");
+         end if;
+         F := Token_Sym;
+         Next_Expect (Tok_Colon, "':' expected");
+         Next_Token;
+         F_Type := Parse_Type;
+         Field := new Node'(Kind => Node_Field,
+                            Field_Ident => F,
+                            Field_Fnode => O_Fnode_Null,
+                            Field_Type => F_Type,
+                            Field_Next => null);
+         case Aggr_Type.Kind is
+            when Type_Record =>
+               New_Record_Field (Constr, Field.Field_Fnode, F.Ident,
+                                 F_Type.Type_Onode);
+            when Type_Union =>
+               New_Union_Field (Constr, Field.Field_Fnode, F.Ident,
+                                F_Type.Type_Onode);
+            when others =>
+               raise Program_Error;
+         end case;
+         if Last_Field = null then
+            Aggr_Type.Record_Union_Fields := Field;
+         else
+            Last_Field.Field_Next := Field;
+         end if;
+         Last_Field := Field;
+         Expect (Tok_Semicolon, "';' expected");
+         Next_Token;
+      end loop;
+   end Parse_Fields;
+
+   procedure Parse_Record_Type (Def : Node_Acc)
+   is
+      Constr : O_Element_List;
+   begin
+      if Def.Type_Onode = O_Tnode_Null then
+         Start_Record_Type (Constr);
+      else
+         Start_Uncomplete_Record_Type (Def.Type_Onode, Constr);
+      end if;
+      Parse_Fields (Def, Constr);
+      Next_Expect (Tok_Record, "end record expected");
+      Finish_Record_Type (Constr, Def.Type_Onode);
+   end Parse_Record_Type;
+
+   procedure Parse_Union_Type (Def : Node_Acc)
+   is
+      Constr : O_Element_List;
+   begin
+      Start_Union_Type (Constr);
+      Parse_Fields (Def, Constr);
+      Next_Expect (Tok_Union, "end union expected");
+      Finish_Union_Type (Constr, Def.Type_Onode);
+   end Parse_Union_Type;
+
+   function Parse_Type return Node_Acc
+   is
+      Res : Node_Acc;
+      T : Token_Type;
+   begin
+      T := Tok;
+      case T is
+         when Tok_Unsigned
+           | Tok_Signed =>
+            Next_Expect (Tok_Left_Paren, "'(' expected");
+            Next_Expect (Tok_Num, "number expected");
+            case T is
+               when Tok_Unsigned =>
+                  Res := new Node'
+                    (Kind => Type_Unsigned,
+                     Type_Onode => New_Unsigned_Type (Natural
+                                                      (Token_Number)));
+               when Tok_Signed =>
+                  Res := new Node'
+                     (Kind => Type_Signed,
+                      Type_Onode => New_Signed_Type (Natural
+                                                     (Token_Number)));
+               when others =>
+                  raise Program_Error;
+            end case;
+            Next_Expect (Tok_Right_Paren, "')' expected");
+         when Tok_Float =>
+            Res := new Node'(Kind => Type_Float,
+                             Type_Onode => New_Float_Type);
+         when Tok_Array =>
+            declare
+               Index_Node : Node_Acc;
+               El_Node : Node_Acc;
+            begin
+               Next_Expect (Tok_Left_Brack, "'[' expected");
+               Next_Token;
+               Index_Node := Parse_Type;
+               Expect (Tok_Right_Brack, "']' expected");
+               Next_Expect (Tok_Of, "'of' expected");
+               Next_Token;
+               El_Node := Parse_Type;
+               Res := new Node'
+                 (Kind => Type_Array,
+                  Type_Onode => New_Array_Type (El_Node.Type_Onode,
+                                                Index_Node.Type_Onode),
+                  Array_Index => Index_Node,
+                  Array_Element => El_Node);
+            end;
+            return Res;
+         when Tok_Subarray =>
+            declare
+               Base_Node : Node_Acc;
+               Res_Type : O_Tnode;
+            begin
+               Next_Token;
+               Base_Node := Parse_Type;
+               Expect (Tok_Left_Brack);
+               Next_Token;
+               Res_Type := New_Constrained_Array_Type
+                 (Base_Node.Type_Onode,
+                  Parse_Constant_Value (Base_Node.Array_Index));
+               Expect (Tok_Right_Brack);
+               Next_Token;
+               Res := new Node' (Kind => Type_Subarray,
+                                 Type_Onode => Res_Type,
+                                 Subarray_Base => Base_Node);
+               return Res;
+            end;
+         when Tok_Ident =>
+            declare
+               Inter : Node_Acc;
+            begin
+               Inter := Get_Decl (Token_Sym);
+               if Inter = null then
+                  Parse_Error ("undefined type name symbol "
+                               & Get_String (Token_Sym.Ident));
+               end if;
+               if Inter.Kind /= Decl_Type then
+                  Parse_Error ("type declarator expected");
+               end if;
+               Res := Inter.Decl_Dtype;
+            end;
+         when Tok_Access =>
+            declare
+               Dtype : Node_Acc;
+            begin
+               Next_Token;
+               if Tok = Tok_Semicolon then
+                  Res := new Node'
+                    (Kind => Type_Access,
+                     Type_Onode => New_Access_Type (O_Tnode_Null),
+                     Access_Dtype => null);
+               else
+                  Dtype := Parse_Type;
+                  Res := new Node'
+                    (Kind => Type_Access,
+                     Type_Onode => New_Access_Type (Dtype.Type_Onode),
+                     Access_Dtype => Dtype);
+               end if;
+               return Res;
+            end;
+         when Tok_Record =>
+            Next_Token;
+            if Tok = Tok_Semicolon then
+               --  Uncomplete record type.
+               Res := new Node'(Kind => Type_Record,
+                                Type_Onode => O_Tnode_Null,
+                                Record_Union_Fields => null);
+               New_Uncomplete_Record_Type (Res.Type_Onode);
+               return Res;
+            end if;
+
+            Res := new Node'(Kind => Type_Record,
+                             Type_Onode => O_Tnode_Null,
+                             Record_Union_Fields => null);
+            Parse_Record_Type (Res);
+         when Tok_Union =>
+            Next_Token;
+            Res := new Node'(Kind => Type_Union,
+                             Type_Onode => O_Tnode_Null,
+                             Record_Union_Fields => null);
+            Parse_Union_Type (Res);
+
+         when Tok_Boolean =>
+            declare
+               False_Lit, True_Lit : Node_Acc;
+            begin
+               Res := new Node'(Kind => Type_Boolean,
+                                Type_Onode => O_Tnode_Null,
+                                Enum_Lits => null);
+               Next_Expect (Tok_Left_Brace, "'{' expected");
+               Next_Expect (Tok_Ident, "identifier expected");
+               False_Lit := new Node'(Kind => Node_Lit,
+                                      Decl_Dtype => Res,
+                                      Decl_Storage => O_Storage_Public,
+                                      Lit_Name => Token_Sym.Ident,
+                                      Lit_Cnode => O_Cnode_Null,
+                                      Lit_Next => null);
+               Next_Expect (Tok_Comma, "',' expected");
+               Next_Expect (Tok_Ident, "identifier expected");
+               True_Lit := new Node'(Kind => Node_Lit,
+                                     Decl_Dtype => Res,
+                                     Decl_Storage => O_Storage_Public,
+                                     Lit_Name => Token_Sym.Ident,
+                                     Lit_Cnode => O_Cnode_Null,
+                                     Lit_Next => null);
+               Next_Expect (Tok_Right_Brace, "'}' expected");
+               False_Lit.Lit_Next := True_Lit;
+               Res.Enum_Lits := False_Lit;
+               New_Boolean_Type (Res.Type_Onode,
+                                 False_Lit.Lit_Name, False_Lit.Lit_Cnode,
+                                 True_Lit.Lit_Name, True_Lit.Lit_Cnode);
+            end;
+         when Tok_Enum =>
+            declare
+               List : O_Enum_List;
+               Lit : Node_Acc;
+               Last_Lit : Node_Acc;
+            begin
+               Res := new Node'(Kind => Type_Enum,
+                                Type_Onode => O_Tnode_Null,
+                                Enum_Lits => null);
+               Last_Lit := null;
+               Push_Scope;
+               Next_Expect (Tok_Left_Brace);
+               Next_Token;
+               --  FIXME: set a size to the enum.
+               Start_Enum_Type (List, 8);
+               loop
+                  Expect (Tok_Ident);
+                  Lit := new Node'(Kind => Node_Lit,
+                                   Decl_Dtype => Res,
+                                   Decl_Storage => O_Storage_Public,
+                                   Lit_Name => Token_Sym.Ident,
+                                   Lit_Cnode => O_Cnode_Null,
+                                   Lit_Next => null);
+                  Add_Decl (Token_Sym, Lit);
+                  New_Enum_Literal (List, Lit.Lit_Name, Lit.Lit_Cnode);
+                  if Last_Lit = null then
+                     Res.Enum_Lits := Lit;
+                  else
+                     Last_Lit.Lit_Next := Lit;
+                  end if;
+                  Last_Lit := Lit;
+                  Next_Expect (Tok_Equal);
+                  Next_Expect (Tok_Num);
+                  Next_Token;
+                  exit when Tok = Tok_Right_Brace;
+                  Expect (Tok_Comma);
+                  Next_Token;
+               end loop;
+               Finish_Enum_Type (List, Res.Type_Onode);
+               Pop_Scope;
+            end;
+         when others =>
+            Parse_Error ("bad type " & Token_Type'Image (Tok));
+            return null;
+      end case;
+      Next_Token;
+      return Res;
+   end Parse_Type;
+
+   procedure Parse_Type_Completion (Decl : Node_Acc)
+   is
+   begin
+      case Tok is
+         when Tok_Record =>
+            Next_Token;
+            Parse_Record_Type (Decl.Decl_Dtype);
+            Next_Token;
+         when Tok_Access =>
+            Next_Token;
+            declare
+               Dtype : Node_Acc;
+            begin
+               Dtype := Parse_Type;
+               Decl.Decl_Dtype.Access_Dtype := Dtype;
+               Finish_Access_Type (Decl.Decl_Dtype.Type_Onode,
+                                   Dtype.Type_Onode);
+            end;
+         when others =>
+            Parse_Error ("'access' or 'record' expected");
+      end case;
+   end Parse_Type_Completion;
+
+--    procedure Parse_Declaration;
+
+   procedure Parse_Expression (Expr_Type : Node_Acc;
+                               Expr : out O_Enode;
+                               Res_Type : out Node_Acc);
+   procedure Parse_Name (Prefix : Node_Acc;
+                         Name : out O_Lnode; N_Type : out Node_Acc);
+   procedure Parse_Lvalue (N : in out O_Lnode; N_Type : in out Node_Acc);
+
+   --  Expect: '('
+   --  Let: next token.
+   procedure Parse_Association (Constr : in out O_Assoc_List;
+                                Decl : Node_Acc);
+
+   function Find_Field_By_Name (Aggr_Type : Node_Acc) return Node_Acc
+   is
+      Field : Node_Acc;
+   begin
+      Field := Aggr_Type.Record_Union_Fields;
+      while Field /= null loop
+         exit when Field.Field_Ident = Token_Sym;
+         Field := Field.Field_Next;
+      end loop;
+      if Field = null then
+         Parse_Error ("no such field name");
+      end if;
+      return Field;
+   end Find_Field_By_Name;
+
+   --  expect: offsetof id.
+   function Parse_Offsetof (Atype : Node_Acc) return O_Cnode
+   is
+      Rec_Type : Node_Acc;
+      Rec_Field : Node_Acc;
+   begin
+      Next_Expect (Tok_Left_Paren);
+      Next_Expect (Tok_Ident);
+      Rec_Type := Get_Decl (Token_Sym);
+      if Rec_Type.Kind /= Decl_Type
+        or else Rec_Type.Decl_Dtype.Kind /= Type_Record
+      then
+         Parse_Error ("type name expected");
+      end if;
+      Next_Expect (Tok_Dot);
+      Next_Expect (Tok_Ident);
+      Rec_Field := Find_Field_By_Name (Rec_Type.Decl_Dtype);
+      Next_Expect (Tok_Right_Paren);
+      return New_Offsetof (Rec_Type.Decl_Dtype.Type_Onode,
+                           Rec_Field.Field_Fnode,
+                           Atype.Type_Onode);
+   end Parse_Offsetof;
+
+   function Parse_Sizeof (Atype : Node_Acc) return O_Cnode
+   is
+      Res : O_Cnode;
+   begin
+      Next_Expect (Tok_Left_Paren);
+      Next_Token;
+      if Tok /= Tok_Ident then
+         Parse_Error ("type name expected");
+      end if;
+      Res := New_Sizeof
+        (Get_Decl (Token_Sym).Decl_Dtype.Type_Onode,
+         Atype.Type_Onode);
+      Next_Expect (Tok_Right_Paren);
+      return Res;
+   end Parse_Sizeof;
+
+   function Parse_Alignof (Atype : Node_Acc) return O_Cnode
+   is
+      Res : O_Cnode;
+   begin
+      Next_Expect (Tok_Left_Paren);
+      Next_Token;
+      if Tok /= Tok_Ident then
+         Parse_Error ("type name expected");
+      end if;
+      Res := New_Alignof
+        (Get_Decl (Token_Sym).Decl_Dtype.Type_Onode,
+         Atype.Type_Onode);
+      Next_Expect (Tok_Right_Paren);
+      return Res;
+   end Parse_Alignof;
+
+   --  Parse a literal whose type is ATYPE.
+   function Parse_Typed_Literal (Atype : Node_Acc) return O_Cnode
+   is
+      Res : O_Cnode;
+   begin
+      case Tok is
+         when Tok_Num =>
+            case Atype.Kind is
+               when Type_Signed =>
+                  Res := New_Signed_Literal
+                    (Atype.Type_Onode, Integer_64 (Token_Number));
+               when Type_Unsigned =>
+                  Res := New_Unsigned_Literal
+                    (Atype.Type_Onode, Token_Number);
+               when others =>
+                  Parse_Error ("bad type for integer literal");
+            end case;
+         when Tok_Minus =>
+            Next_Token;
+            case Tok is
+               when Tok_Num =>
+                  declare
+                     V : Integer_64;
+                  begin
+                     if Token_Number = Unsigned_64 (Integer_64'Last) + 1 then
+                        V := Integer_64'First;
+                     else
+                        V := -Integer_64 (Token_Number);
+                     end if;
+                     Res := New_Signed_Literal (Atype.Type_Onode, V);
+                  end;
+               when Tok_Float_Num =>
+                  Res := New_Float_Literal (Atype.Type_Onode, -Token_Float);
+               when others =>
+                  Parse_Error ("bad token after '-'");
+            end case;
+         when Tok_Float_Num =>
+            Res := New_Float_Literal (Atype.Type_Onode, Token_Float);
+         when Tok_Ident =>
+            declare
+               Pfx : Node_Acc;
+               N : Node_Acc;
+            begin
+               --  Note: we don't use get_decl, since the name can be a literal
+               --  name, which is not directly visible.
+               if Token_Sym.Name /= null
+                 and then Token_Sym.Name.Inter.Kind = Decl_Type
+               then
+                  --  A typed expression.
+                  Pfx := Token_Sym.Name.Inter;
+                  N := Pfx.Decl_Dtype;
+                  if Atype /= null and then N /= Atype then
+                     Parse_Error ("type mismatch");
+                  end if;
+                  Next_Expect (Tok_Tick);
+                  Next_Token;
+                  if Tok = Tok_Left_Brack then
+                     Next_Token;
+                     Res := Parse_Typed_Literal (N);
+                     Expect (Tok_Right_Brack);
+                  elsif Tok = Tok_Ident then
+                     if Token_Sym = Id_Offsetof then
+                        Res := Parse_Offsetof (N);
+                     elsif Token_Sym = Id_Sizeof then
+                        Res := Parse_Sizeof (N);
+                     elsif Token_Sym = Id_Alignof then
+                        Res := Parse_Alignof (N);
+                     elsif Token_Sym = Id_Address
+                       or Token_Sym = Id_Unchecked_Address
+                       or Token_Sym = Id_Subprg_Addr
+                     then
+                        Res := Parse_Constant_Address (Pfx);
+                     elsif Token_Sym = Id_Conv then
+                        Next_Expect (Tok_Left_Paren);
+                        Next_Token;
+                        Res := Parse_Typed_Literal (N);
+                        Expect (Tok_Right_Paren);
+                     else
+                        Parse_Error ("offsetof or sizeof attributes expected");
+                     end if;
+                  else
+                     Parse_Error ("'[' or attribute expected");
+                  end if;
+               else
+                  if Atype.Kind /= Type_Enum
+                    and then Atype.Kind /= Type_Boolean
+                  then
+                     Parse_Error ("name allowed only for enumeration");
+                  end if;
+                  N := Atype.Enum_Lits;
+                  while N /= null loop
+                     if Is_Equal (N.Lit_Name, Token_Sym.Ident) then
+                        Res := N.Lit_Cnode;
+                        exit;
+                     end if;
+                     N := N.Lit_Next;
+                  end loop;
+                  if N = null then
+                     Parse_Error ("no matching literal");
+                     return O_Cnode_Null;
+                  end if;
+               end if;
+            end;
+         when Tok_Null =>
+            Res := New_Null_Access (Atype.Type_Onode);
+         when others =>
+            Parse_Error ("bad primary expression: " & Token_Type'Image (Tok));
+            return O_Cnode_Null;
+      end case;
+      Next_Token;
+      return Res;
+   end Parse_Typed_Literal;
+
+   --  expect: next token
+   --  Parse an expression starting with NAME.
+   procedure Parse_Named_Expression
+     (Atype : Node_Acc; Name : Node_Acc; Stop_At_All : Boolean;
+                                         Res : out O_Enode;
+                                         Res_Type : out Node_Acc)
+   is
+   begin
+      if Tok = Tok_Tick then
+         Next_Token;
+         if Tok = Tok_Left_Brack then
+            --  Typed literal.
+            Next_Token;
+            Res := New_Lit (Parse_Typed_Literal (Name.Decl_Dtype));
+            Res_Type := Name.Decl_Dtype;
+            Expect (Tok_Right_Brack);
+            Next_Token;
+         elsif Tok = Tok_Left_Paren then
+            --  Typed expression (used for comparaison operators)
+            Next_Token;
+            Parse_Expression (Name.Decl_Dtype, Res, Res_Type);
+            Expect (Tok_Right_Paren);
+            Next_Token;
+         elsif Tok = Tok_Ident then
+            --  Attribute.
+            if Token_Sym = Id_Conv then
+               Next_Expect (Tok_Left_Paren);
+               Next_Token;
+               Parse_Expression (null, Res, Res_Type);
+               --  Discard Res_Type.
+               Expect (Tok_Right_Paren);
+               Next_Token;
+               Res_Type := Name.Decl_Dtype;
+               Res := New_Convert_Ov (Res, Res_Type.Type_Onode);
+               --  Fall-through.
+            elsif Token_Sym = Id_Address
+              or Token_Sym = Id_Unchecked_Address
+              or Token_Sym = Id_Subprg_Addr
+            then
+               Res_Type := Name.Decl_Dtype;
+               Res := Parse_Address (Name);
+               --  Fall-through.
+            elsif Token_Sym = Id_Sizeof then
+               Res_Type := Name.Decl_Dtype;
+               Res := New_Lit (Parse_Sizeof (Res_Type));
+               Next_Token;
+               return;
+            elsif Token_Sym = Id_Alignof then
+               Res_Type := Name.Decl_Dtype;
+               Res := New_Lit (Parse_Alignof (Res_Type));
+               Next_Token;
+               return;
+            elsif Token_Sym = Id_Alloca then
+               Next_Expect (Tok_Left_Paren);
+               Next_Token;
+               Parse_Expression (null, Res, Res_Type);
+               --  Discard Res_Type.
+               Res_Type := Name.Decl_Dtype;
+               Res := New_Alloca (Res_Type.Type_Onode, Res);
+               Expect (Tok_Right_Paren);
+               Next_Token;
+               return;
+            elsif Token_Sym = Id_Offsetof then
+               Res_Type := Atype;
+               Res := New_Lit (Parse_Offsetof (Res_Type));
+               Next_Token;
+               return;
+            else
+               Parse_Error ("unknown attribute name");
+            end if;
+            -- Fall-through.
+         else
+            Parse_Error ("typed expression expected");
+         end if;
+      elsif Tok = Tok_Left_Paren then
+         if Name.Kind /= Node_Function then
+            Parse_Error ("function name expected");
+         end if;
+         declare
+            Constr : O_Assoc_List;
+         begin
+            Parse_Association (Constr, Name);
+            Res := New_Function_Call (Constr);
+            Res_Type := Name.Decl_Dtype;
+            --  Fall-through.
+         end;
+      elsif Name.Kind = Node_Object
+        or else Name.Kind = Decl_Param
+      then
+         --  Name.
+         declare
+            Lval : O_Lnode;
+         begin
+            Parse_Name (Name, Lval, Res_Type);
+            Res := New_Value (Lval);
+         end;
+      else
+         Parse_Error ("bad ident expression: "
+                      & Token_Type'Image (Tok));
+      end if;
+
+      -- Continue.
+      --  R_TYPE and RES must be set.
+      if Tok = Tok_Dot then
+         if Stop_At_All then
+            return;
+         end if;
+         Next_Token;
+         if Tok = Tok_All then
+            if Res_Type.Kind /= Type_Access then
+               Parse_Error ("type of prefix is not an access");
+            end if;
+            declare
+               N : O_Lnode;
+            begin
+               Next_Token;
+               N := New_Access_Element (Res);
+               Res_Type := Res_Type.Access_Dtype;
+               Parse_Lvalue (N, Res_Type);
+               Res := New_Value (N);
+            end;
+            return;
+         else
+            Parse_Error ("'.all' expected");
+         end if;
+      end if;
+   end Parse_Named_Expression;
+
+   procedure Parse_Primary_Expression (Atype : Node_Acc;
+                                       Res : out O_Enode;
+                                       Res_Type : out Node_Acc)
+   is
+   begin
+      case Tok is
+         when Tok_Num
+           | Tok_Float_Num =>
+            if Atype = null then
+               Parse_Error ("numeric literal without type context");
+            end if;
+            Res_Type := Atype;
+            Res := New_Lit (Parse_Typed_Literal (Atype));
+         when Tok_Ident =>
+            declare
+               N : Node_Acc;
+            begin
+               N := Get_Decl (Token_Sym);
+               Next_Token;
+               Parse_Named_Expression (Atype, N, False, Res, Res_Type);
+            end;
+         when Tok_Left_Paren =>
+            Next_Token;
+            Parse_Expression (Atype, Res, Res_Type);
+            Expect (Tok_Right_Paren);
+            Next_Token;
+         when others =>
+            Parse_Error ("bad primary expression: " & Token_Type'Image (Tok));
+      end case;
+   end Parse_Primary_Expression;
+
+   --  Parse '-' EXPR, 'not' EXPR, 'abs' EXPR or EXPR.
+   procedure Parse_Unary_Expression (Atype : Node_Acc;
+                                     Res : out O_Enode;
+                                     Res_Type : out Node_Acc)
+   is
+   begin
+      case Tok is
+         when Tok_Minus =>
+            Next_Token;
+            Parse_Primary_Expression (Atype, Res, Res_Type);
+            Res := New_Monadic_Op (ON_Neg_Ov, Res);
+         when Tok_Not =>
+            Next_Token;
+            Parse_Unary_Expression (Atype, Res, Res_Type);
+            Res := New_Monadic_Op (ON_Not, Res);
+         when Tok_Abs =>
+            Next_Token;
+            Parse_Unary_Expression (Atype, Res, Res_Type);
+            Res := New_Monadic_Op (ON_Abs_Ov, Res);
+         when others =>
+            Parse_Primary_Expression (Atype, Res, Res_Type);
+      end case;
+   end Parse_Unary_Expression;
+
+   function Check_Sharp (Op_Ov : ON_Op_Kind) return ON_Op_Kind is
+   begin
+      Next_Expect (Tok_Sharp);
+      Next_Token;
+      return Op_Ov;
+   end Check_Sharp;
+
+   procedure Parse_Expression (Expr_Type : Node_Acc;
+                               Expr : out O_Enode;
+                               Res_Type : out Node_Acc)
+   is
+      Op_Type : Node_Acc;
+      L : O_Enode;
+      R : O_Enode;
+      Op : ON_Op_Kind;
+   begin
+      if Expr_Type = null or else Expr_Type.Kind = Type_Boolean then
+         --  The type of the expression isn't known, as this can be a
+         --  comparaison operator.
+         Op_Type := null;
+      else
+         Op_Type := Expr_Type;
+      end if;
+      Parse_Unary_Expression (Op_Type, L, Res_Type);
+      case Tok is
+         when Tok_Div =>
+            Op := Check_Sharp (ON_Div_Ov);
+         when Tok_Plus =>
+            Op := Check_Sharp (ON_Add_Ov);
+         when Tok_Minus =>
+            Op := Check_Sharp (ON_Sub_Ov);
+         when Tok_Star =>
+            Op := Check_Sharp (ON_Mul_Ov);
+         when Tok_Mod =>
+            Op := Check_Sharp (ON_Mod_Ov);
+         when Tok_Rem =>
+            Op := Check_Sharp (ON_Rem_Ov);
+
+         when Tok_Equal =>
+            Op := ON_Eq;
+         when Tok_Not_Equal =>
+            Op := ON_Neq;
+         when Tok_Greater =>
+            Op := ON_Gt;
+         when Tok_Greater_Eq =>
+            Op := ON_Ge;
+         when Tok_Less =>
+            Op := ON_Lt;
+         when Tok_Less_Eq =>
+            Op := ON_Le;
+
+         when Tok_Or =>
+            Op := ON_Or;
+            Next_Token;
+         when Tok_And =>
+            Op := ON_And;
+            Next_Token;
+         when Tok_Xor =>
+            Op := ON_Xor;
+            Next_Token;
+
+         when others =>
+            Expr := L;
+            return;
+      end case;
+      if Op in ON_Compare_Op_Kind then
+         Next_Token;
+      end if;
+
+      Parse_Unary_Expression (Res_Type, R, Res_Type);
+      case Op is
+         when ON_Dyadic_Op_Kind =>
+            Expr := New_Dyadic_Op (Op, L, R);
+         when ON_Compare_Op_Kind =>
+            if Expr_Type = null then
+               Parse_Error ("comparaison operator requires a type");
+            end if;
+            Expr := New_Compare_Op (Op, L, R, Expr_Type.Type_Onode);
+            Res_Type := Expr_Type;
+         when others =>
+            raise Program_Error;
+      end case;
+   end Parse_Expression;
+
+   --  Expect and leave: next token
+   procedure Parse_Lvalue (N : in out O_Lnode; N_Type : in out Node_Acc)
+   is
+   begin
+      loop
+         case Tok is
+            when Tok_Dot =>
+               Next_Token;
+               if Tok = Tok_All then
+                  if N_Type.Kind /= Type_Access then
+                     Parse_Error ("type of prefix is not an access");
+                  end if;
+                  N := New_Access_Element (New_Value (N));
+                  N_Type := N_Type.Access_Dtype;
+                  Next_Token;
+               elsif Tok = Tok_Ident then
+                  if N_Type.Kind /= Type_Record and N_Type.Kind /= Type_Union
+                  then
+                     Parse_Error
+                       ("type of prefix is neither a record nor an union");
+                  end if;
+                  declare
+                     Field : Node_Acc;
+                  begin
+                     Field := Find_Field_By_Name (N_Type);
+                     N := New_Selected_Element (N, Field.Field_Fnode);
+                     N_Type := Field.Field_Type;
+                     Next_Token;
+                  end;
+               else
+                  Parse_Error
+                    ("'.' must be followed by 'all' or a field name");
+               end if;
+            when Tok_Left_Brack =>
+               declare
+                  V : O_Enode;
+                  Bt : Node_Acc;
+                  Res_Type : Node_Acc;
+               begin
+                  Next_Token;
+                  if N_Type.Kind = Type_Subarray then
+                     Bt := N_Type.Subarray_Base;
+                  else
+                     Bt := N_Type;
+                  end if;
+                  if Bt.Kind /= Type_Array then
+                     Parse_Error ("type of prefix is not an array");
+                  end if;
+                  Parse_Expression (Bt.Array_Index, V, Res_Type);
+                  if Tok = Tok_Elipsis then
+                     N := New_Slice (N, Bt.Type_Onode, V);
+                     Next_Token;
+                  else
+                     N := New_Indexed_Element (N, V);
+                     N_Type := Bt.Array_Element;
+                  end if;
+                  Expect (Tok_Right_Brack);
+                  Next_Token;
+               end;
+            when others =>
+               return;
+         end case;
+      end loop;
+   end Parse_Lvalue;
+
+   procedure Parse_Name (Prefix : Node_Acc;
+                         Name : out O_Lnode; N_Type : out Node_Acc)
+   is
+   begin
+      case Prefix.Kind is
+         when Decl_Param =>
+            Name := New_Obj (Prefix.Param_Node);
+            N_Type := Prefix.Decl_Dtype;
+         when Node_Object =>
+            Name := New_Obj (Prefix.Obj_Node);
+            N_Type := Prefix.Decl_Dtype;
+         when Decl_Type =>
+            declare
+               Val : O_Enode;
+            begin
+               Parse_Named_Expression (null, Prefix, True, Val, N_Type);
+               if N_Type /= Prefix.Decl_Dtype then
+                  Parse_Error ("type doesn't match");
+               end if;
+               if Tok = Tok_Dot then
+                  Next_Token;
+                  if Tok = Tok_All then
+                     if N_Type.Kind /= Type_Access then
+                        Parse_Error ("type of prefix is not an access");
+                     end if;
+                     Name := New_Access_Element (Val);
+                     N_Type := N_Type.Access_Dtype;
+                     Next_Token;
+                  else
+                     Parse_Error ("'.all' expected");
+                  end if;
+               else
+                  Parse_Error ("name expected");
+               end if;
+            end;
+         when others =>
+            Parse_Error ("invalid name");
+      end case;
+      Parse_Lvalue (Name, N_Type);
+   end Parse_Name;
+
+   --  Expect: '('
+   --  Let: next token.
+   procedure Parse_Association (Constr : in out O_Assoc_List; Decl : Node_Acc)
+   is
+      Param : Node_Acc;
+      Expr : O_Enode;
+      Expr_Type : Node_Acc;
+   begin
+      Start_Association (Constr, Decl.Subprg_Node);
+      if Tok /= Tok_Left_Paren then
+         Parse_Error ("'(' expected for a subprogram call");
+      end if;
+      Next_Token;
+      Param := Decl.Subprg_Params;
+      while Tok /= Tok_Right_Paren loop
+         if Param = null then
+            Parse_Error ("too many parameters");
+         end if;
+         Parse_Expression (Param.Decl_Dtype, Expr, Expr_Type);
+         New_Association (Constr, Expr);
+         Param := Param.Param_Next;
+         exit when Tok /= Tok_Comma;
+         Next_Token;
+      end loop;
+      if Param /= null then
+         Parse_Error ("missing parameters");
+      end if;
+      if Tok /= Tok_Right_Paren then
+         Parse_Error ("')' expected to finish a subprogram call, found "
+                      & Token_Type'Image (Tok));
+      end if;
+      Next_Token;
+   end Parse_Association;
+
+   type Loop_Info;
+   type Loop_Info_Acc is access Loop_Info;
+   type Loop_Info is record
+      Num : Natural;
+      Blk : O_Snode;
+      Prev : Loop_Info_Acc;
+   end record;
+   procedure Free is new Ada.Unchecked_Deallocation
+     (Name => Loop_Info_Acc, Object => Loop_Info);
+
+   Loop_Stack : Loop_Info_Acc := null;
+
+   function Find_Loop (N : Natural) return Loop_Info_Acc
+   is
+      Res : Loop_Info_Acc;
+   begin
+      Res := Loop_Stack;
+      while Res /= null loop
+         if Res.Num = N then
+            return Res;
+         end if;
+         Res := Res.Prev;
+      end loop;
+      return null;
+   end Find_Loop;
+
+   Current_Subprg : Node_Acc := null;
+
+   procedure Parse_Statement;
+
+   --  Expect : next token
+   --  Let: next token
+   procedure Parse_Statements is
+   begin
+      loop
+         exit when Tok = Tok_End;
+         exit when Tok = Tok_Else;
+         exit when Tok = Tok_When;
+         Parse_Statement;
+      end loop;
+   end Parse_Statements;
+
+   --  Expect : next token
+   --  Let: next token
+   procedure Parse_Statement is
+   begin
+      if Flag_Renumber then
+         New_Debug_Line_Stmt (Lineno);
+      end if;
+
+      case Tok is
+         when Tok_Comment =>
+            Next_Token;
+
+         when Tok_Declare =>
+            Start_Declare_Stmt;
+            Parse_Compound_Statement;
+            Expect (Tok_Semicolon);
+            Next_Token;
+            Finish_Declare_Stmt;
+
+         when Tok_Line_Number =>
+            Next_Expect (Tok_Num);
+            if Flag_Renumber = False then
+               New_Debug_Line_Stmt (Natural (Token_Number));
+            end if;
+            Next_Token;
+
+         when Tok_If =>
+            declare
+               If_Blk : O_If_Block;
+               Cond : O_Enode;
+               Cond_Type : Node_Acc;
+            begin
+               Next_Token;
+               Parse_Expression (null, Cond, Cond_Type);
+               Start_If_Stmt (If_Blk, Cond);
+               Expect (Tok_Then);
+               Next_Token;
+               Parse_Statements;
+               if Tok = Tok_Else then
+                  Next_Token;
+                  New_Else_Stmt (If_Blk);
+                  Parse_Statements;
+               end if;
+               Finish_If_Stmt (If_Blk);
+               Expect (Tok_End);
+               Next_Expect (Tok_If);
+               Next_Expect (Tok_Semicolon);
+               Next_Token;
+            end;
+
+         when Tok_Loop =>
+            declare
+               Info : Loop_Info_Acc;
+               Num : Natural;
+            begin
+               Next_Expect (Tok_Num);
+               Num := Natural (Token_Number);
+               if Find_Loop (Num) /= null then
+                  Parse_Error ("loop label already defined");
+               end if;
+               Info := new Loop_Info;
+               Info.Num := Num;
+               Info.Prev := Loop_Stack;
+               Loop_Stack := Info;
+               Start_Loop_Stmt (Info.Blk);
+               Next_Expect (Tok_Colon);
+               Next_Token;
+               Parse_Statements;
+               Finish_Loop_Stmt (Info.Blk);
+               Next_Expect (Tok_Loop);
+               Next_Expect (Tok_Semicolon);
+               Loop_Stack := Info.Prev;
+               Free (Info);
+               Next_Token;
+            end;
+
+         when Tok_Exit
+           | Tok_Next =>
+            declare
+               Label : Loop_Info_Acc;
+               Etok : Token_Type;
+            begin
+               Etok := Tok;
+               Next_Expect (Tok_Loop);
+               Next_Expect (Tok_Num);
+               Label := Find_Loop (Natural (Token_Number));
+               if Label = null then
+                  Parse_Error ("no such loop");
+               end if;
+               if Etok = Tok_Exit then
+                  New_Exit_Stmt (Label.Blk);
+               else
+                  New_Next_Stmt (Label.Blk);
+               end if;
+               Next_Expect (Tok_Semicolon);
+               Next_Token;
+            end;
+
+         when Tok_Return =>
+            declare
+               Res : O_Enode;
+               Res_Type : Node_Acc;
+            begin
+               Next_Token;
+               if Tok /= Tok_Semicolon then
+                  Parse_Expression (Current_Subprg.Decl_Dtype, Res, Res_Type);
+                  New_Return_Stmt (Res);
+                  if Tok /= Tok_Semicolon then
+                     Parse_Error ("';' expected at end of return statement");
+                  end if;
+               else
+                  New_Return_Stmt;
+               end if;
+               Next_Token;
+            end;
+
+         when Tok_Ident =>
+            --  This is either a procedure call or an assignment.
+            declare
+               Inter : Node_Acc;
+            begin
+               Inter := Get_Decl (Token_Sym);
+               Next_Token;
+               if Tok = Tok_Left_Paren then
+                  --  A procedure call.
+                  declare
+                     Constr : O_Assoc_List;
+                  begin
+                     Parse_Association (Constr, Inter);
+                     New_Procedure_Call (Constr);
+                     if Tok /= Tok_Semicolon then
+                        Parse_Error ("';' expected after call");
+                     end if;
+                     Next_Token;
+                     return;
+                  end;
+               else
+                  --  An assignment.
+                  declare
+                     Name : O_Lnode;
+                     Expr : O_Enode;
+                     Expr_Type : Node_Acc;
+                     N_Type : Node_Acc;
+                  begin
+                     Parse_Name (Inter, Name, N_Type);
+                     if Tok /= Tok_Assign then
+                        Parse_Error ("`:=' expected after a variable");
+                     end if;
+                     Next_Token;
+                     Parse_Expression (N_Type, Expr, Expr_Type);
+                     New_Assign_Stmt (Name, Expr);
+                     if Tok /= Tok_Semicolon then
+                        Parse_Error ("';' expected at end of assignment");
+                     end if;
+                     Next_Token;
+                     return;
+                  end;
+               end if;
+            end;
+
+         when Tok_Case =>
+            declare
+               Case_Blk : O_Case_Block;
+               L : O_Cnode;
+               Choice : O_Enode;
+               Choice_Type : Node_Acc;
+            begin
+               Next_Token;
+               Parse_Expression (null, Choice, Choice_Type);
+               Start_Case_Stmt (Case_Blk, Choice);
+               Expect (Tok_Is);
+               Next_Token;
+               loop
+                  exit when Tok = Tok_End;
+                  Expect (Tok_When);
+                  Next_Token;
+                  Start_Choice (Case_Blk);
+                  loop
+                     if Tok = Tok_Default then
+                        New_Default_Choice (Case_Blk);
+                        Next_Token;
+                     else
+                        L := Parse_Typed_Literal (Choice_Type);
+                        if Tok = Tok_Elipsis then
+                           Next_Token;
+                           New_Range_Choice
+                             (Case_Blk, L, Parse_Typed_Literal (Choice_Type));
+                        else
+                           New_Expr_Choice (Case_Blk, L);
+                        end if;
+                     end if;
+                     exit when Tok = Tok_Arrow;
+                     Expect (Tok_Comma);
+                     Next_Token;
+                  end loop;
+                  --  Skip '=>'.
+                  Next_Token;
+                  Finish_Choice (Case_Blk);
+                  Parse_Statements;
+               end loop;
+               Finish_Case_Stmt (Case_Blk);
+               Expect (Tok_End);
+               Next_Expect (Tok_Case);
+               Next_Expect (Tok_Semicolon);
+               Next_Token;
+            end;
+         when others =>
+            Parse_Error ("bad statement: " & Token_Type'Image (Tok));
+      end case;
+   end Parse_Statement;
+
+   procedure Parse_Compound_Statement is
+   begin
+      if Tok /= Tok_Declare then
+         Parse_Error ("'declare' expected to start a statements block");
+      end if;
+      Next_Token;
+
+      Push_Scope;
+
+      --  Parse declarations.
+      while Tok /= Tok_Begin loop
+         Parse_Declaration;
+      end loop;
+      Next_Token;
+
+      --  Parse statements.
+      Parse_Statements;
+      Expect (Tok_End);
+      Next_Token;
+
+      Pop_Scope;
+   end Parse_Compound_Statement;
+
+   --  Parse (P1 : T1; P2: T2; ...)
+   function Parse_Parameter_List return Node_Acc
+   is
+      First, Last : Node_Acc;
+      P : Node_Acc;
+   begin
+      Expect (Tok_Left_Paren);
+      Next_Token;
+      if Tok = Tok_Right_Paren then
+         Next_Token;
+         return null;
+      end if;
+      First := null;
+      Last := null;
+      loop
+         Expect (Tok_Ident);
+         P := new Node'(Kind => Decl_Param,
+                        Decl_Dtype => null,
+                        Decl_Storage => O_Storage_Public,
+                        Param_Node => O_Dnode_Null,
+                        Param_Name => Token_Sym,
+                        Param_Next => null);
+         --  Link
+         if Last = null then
+            First := P;
+         else
+            Last.Param_Next := P;
+         end if;
+         Last := P;
+         Next_Expect (Tok_Colon);
+         Next_Token;
+         P.Decl_Dtype := Parse_Type;
+         exit when Tok = Tok_Right_Paren;
+         Expect (Tok_Semicolon);
+         Next_Token;
+      end loop;
+      Next_Token;
+      return First;
+   end Parse_Parameter_List;
+
+   procedure Create_Interface_List (Constr : in out O_Inter_List;
+                                    First_Inter : Node_Acc)
+   is
+      Inter : Node_Acc;
+   begin
+      Inter := First_Inter;
+      while Inter /= null loop
+         New_Interface_Decl (Constr, Inter.Param_Node, Inter.Param_Name.Ident,
+                             Inter.Decl_Dtype.Type_Onode);
+         Inter := Inter.Param_Next;
+      end loop;
+   end Create_Interface_List;
+
+   procedure Check_Parameter_List (List : Node_Acc)
+   is
+      Param : Node_Acc;
+   begin
+      Next_Expect (Tok_Left_Paren);
+      Next_Token;
+      Param := List;
+      while Tok /= Tok_Right_Paren loop
+         if Param = null then
+            Parse_Error ("subprogram redefined with more parameters");
+         end if;
+         Expect (Tok_Ident);
+         if Token_Sym /= Param.Param_Name then
+            Parse_Error ("subprogram redefined with different parameter name");
+         end if;
+         Next_Expect (Tok_Colon);
+         Next_Token;
+         if Parse_Type /= Param.Decl_Dtype then
+            Parse_Error ("subprogram redefined with different parameter type");
+         end if;
+         Param := Param.Param_Next;
+         exit when Tok = Tok_Right_Paren;
+         Expect (Tok_Semicolon);
+         Next_Token;
+      end loop;
+      Expect (Tok_Right_Paren);
+      Next_Token;
+      if Param /= null then
+         Parse_Error ("subprogram redefined with less parameters");
+      end if;
+   end Check_Parameter_List;
+
+   procedure Parse_Subprogram_Body (Subprg : Node_Acc)
+   is
+      Param : Node_Acc;
+      Prev_Subprg : Node_Acc;
+   begin
+      Prev_Subprg := Current_Subprg;
+      Current_Subprg := Subprg;
+
+      Start_Subprogram_Body (Subprg.Subprg_Node);
+      Push_Scope;
+
+      --  Put parameters in the current scope.
+      Param := Subprg.Subprg_Params;
+      while Param /= null loop
+         Add_Decl (Param.Param_Name, Param);
+         Param := Param.Param_Next;
+      end loop;
+
+      Parse_Compound_Statement;
+
+      Pop_Scope;
+      Finish_Subprogram_Body;
+
+      Current_Subprg := Prev_Subprg;
+   end Parse_Subprogram_Body;
+
+   procedure Parse_Function_Definition (Storage : O_Storage)
+   is
+      Constr : O_Inter_List;
+      Sym : Syment_Acc;
+      N : Node_Acc;
+   begin
+      Expect (Tok_Function);
+      Next_Expect (Tok_Ident);
+      Sym := Token_Sym;
+      if Sym.Name /= null then
+         N := Get_Decl (Sym);
+         Check_Parameter_List (N.Subprg_Params);
+         Expect (Tok_Return);
+         Next_Expect (Tok_Ident);
+         Next_Token;
+      else
+         N := new Node'(Kind => Node_Function,
+                        Decl_Dtype => null,
+                        Decl_Storage => Storage,
+                        Subprg_Node => O_Dnode_Null,
+                        Subprg_Name => Sym,
+                        Subprg_Params => null);
+         Next_Token;
+         N.Subprg_Params := Parse_Parameter_List;
+         Expect (Tok_Return);
+         Next_Token;
+         N.Decl_Dtype := Parse_Type;
+
+         Start_Function_Decl (Constr, N.Subprg_Name.Ident, Storage,
+                              N.Decl_Dtype.Type_Onode);
+         Create_Interface_List (Constr, N.Subprg_Params);
+         Finish_Subprogram_Decl (Constr, N.Subprg_Node);
+
+         Add_Decl (Sym, N);
+      end if;
+
+      if Tok = Tok_Declare then
+         Parse_Subprogram_Body (N);
+      end if;
+   end Parse_Function_Definition;
+
+   procedure Parse_Procedure_Definition (Storage : O_Storage)
+   is
+      Constr : O_Inter_List;
+      Sym : Syment_Acc;
+      N : Node_Acc;
+   begin
+      Expect (Tok_Procedure);
+      Next_Expect (Tok_Ident);
+      Sym := Token_Sym;
+      if Sym.Name /= null then
+         N := Get_Decl (Sym);
+         Check_Parameter_List (N.Subprg_Params);
+      else
+         N := new Node'(Kind => Node_Procedure,
+                        Decl_Dtype => null,
+                        Decl_Storage => Storage,
+                        Subprg_Node => O_Dnode_Null,
+                        Subprg_Name => Sym,
+                        Subprg_Params => null);
+         Next_Token;
+         N.Subprg_Params := Parse_Parameter_List;
+
+         Start_Procedure_Decl (Constr, N.Subprg_Name.Ident, Storage);
+         Create_Interface_List (Constr, N.Subprg_Params);
+         Finish_Subprogram_Decl (Constr, N.Subprg_Node);
+
+         Add_Decl (Sym, N);
+      end if;
+
+      if Tok = Tok_Declare then
+         Parse_Subprogram_Body (N);
+      end if;
+   end Parse_Procedure_Definition;
+
+   function Parse_Address (Prefix : Node_Acc) return O_Enode
+   is
+      Pfx : Node_Acc;
+      N : O_Lnode;
+      N_Type : Node_Acc;
+      Res : O_Enode;
+      Attr : Syment_Acc;
+      T : O_Tnode;
+   begin
+      Attr := Token_Sym;
+      Next_Expect (Tok_Left_Paren);
+      Next_Expect (Tok_Ident);
+      Pfx := Get_Decl (Token_Sym);
+      T := Prefix.Decl_Dtype.Type_Onode;
+      if Attr = Id_Subprg_Addr then
+         Expect (Tok_Ident);
+         Pfx := Get_Decl (Token_Sym);
+         if Pfx.Kind not in Nodes_Subprogram then
+            Parse_Error ("subprogram identifier expected");
+         end if;
+         Res := New_Lit (New_Subprogram_Address (Pfx.Subprg_Node, T));
+         Next_Token;
+      else
+         Next_Token;
+         Parse_Name (Pfx, N, N_Type);
+         if Attr = Id_Address then
+            Res := New_Address (N, T);
+         elsif Attr = Id_Unchecked_Address then
+            Res := New_Unchecked_Address (N, T);
+         else
+            Parse_Error ("address attribute expected");
+         end if;
+      end if;
+      Expect (Tok_Right_Paren);
+      Next_Token;
+      return Res;
+   end Parse_Address;
+
+   function Parse_Constant_Address (Prefix : Node_Acc) return O_Cnode
+   is
+      Pfx : Node_Acc;
+      Res : O_Cnode;
+      Attr : Syment_Acc;
+      T : O_Tnode;
+   begin
+      Attr := Token_Sym;
+      Next_Expect (Tok_Left_Paren);
+      Next_Expect (Tok_Ident);
+      Pfx := Get_Decl (Token_Sym);
+      T := Prefix.Decl_Dtype.Type_Onode;
+      if Attr = Id_Subprg_Addr then
+         Expect (Tok_Ident);
+         Pfx := Get_Decl (Token_Sym);
+         if Pfx.Kind not in Nodes_Subprogram then
+            Parse_Error ("subprogram identifier expected");
+         end if;
+         Res := New_Subprogram_Address (Pfx.Subprg_Node, T);
+         Next_Token;
+      else
+         Next_Token;
+         if Attr = Id_Address then
+            Res := New_Global_Address (Pfx.Obj_Node, T);
+         elsif Attr = Id_Unchecked_Address then
+            Res := New_Global_Unchecked_Address (Pfx.Obj_Node, T);
+         else
+            Parse_Error ("address attribute expected");
+         end if;
+      end if;
+      Expect (Tok_Right_Paren);
+      return Res;
+   end Parse_Constant_Address;
+
+   function Parse_Constant_Value (Atype : Node_Acc) return O_Cnode
+   is
+      Res : O_Cnode;
+   begin
+      case Atype.Kind is
+         when Type_Subarray =>
+            declare
+               Constr : O_Array_Aggr_List;
+               El : Node_Acc;
+            begin
+               Expect (Tok_Left_Brace);
+               Next_Token;
+               Start_Array_Aggr (Constr, Atype.Type_Onode);
+               El := Atype.Subarray_Base.Array_Element;
+               for I in Natural loop
+                  exit when Tok = Tok_Right_Brace;
+                  if I /= 0 then
+                     Expect (Tok_Comma);
+                     Next_Token;
+                  end if;
+                  New_Array_Aggr_El (Constr, Parse_Constant_Value (El));
+               end loop;
+               Finish_Array_Aggr (Constr, Res);
+               Next_Token;
+               return Res;
+            end;
+         when Type_Unsigned
+           | Type_Signed
+           | Type_Enum
+           | Type_Float
+           | Type_Boolean
+           | Type_Access =>
+            --return Parse_Primary_Expression (Atype);
+            return Parse_Typed_Literal (Atype);
+         when Type_Record =>
+            declare
+               Constr : O_Record_Aggr_List;
+               Field : Node_Acc;
+            begin
+               Expect (Tok_Left_Brace);
+               Next_Token;
+               Start_Record_Aggr (Constr, Atype.Type_Onode);
+               Field := Atype.Record_Union_Fields;
+               while Field /= null loop
+                  if Tok = Tok_Dot then
+                     Next_Expect (Tok_Ident);
+                     if Token_Sym /= Field.Field_Ident then
+                        Parse_Error ("bad field name");
+                     end if;
+                     Next_Expect (Tok_Equal);
+                     Next_Token;
+                  end if;
+                  New_Record_Aggr_El
+                    (Constr, Parse_Constant_Value (Field.Field_Type));
+                  Field := Field.Field_Next;
+                  if Field /= null then
+                     Expect (Tok_Comma);
+                     Next_Token;
+                  end if;
+               end loop;
+               Finish_Record_Aggr (Constr, Res);
+               Expect (Tok_Right_Brace);
+               Next_Token;
+               return Res;
+            end;
+         when Type_Union =>
+            declare
+               Field : Node_Acc;
+            begin
+               Expect (Tok_Left_Brace);
+               Next_Token;
+               Expect (Tok_Dot);
+               Next_Expect (Tok_Ident);
+               Field := Find_Field_By_Name (Atype);
+               Next_Expect (Tok_Equal);
+               Next_Token;
+               Res := New_Union_Aggr
+                 (Atype.Type_Onode, Field.Field_Fnode,
+                  Parse_Constant_Value (Field.Field_Type));
+               Expect (Tok_Right_Brace);
+               Next_Token;
+               return Res;
+            end;
+         when others =>
+            raise Program_Error;
+      end case;
+   end Parse_Constant_Value;
+
+   procedure Parse_Constant_Declaration (Storage : O_Storage)
+   is
+      N : Node_Acc;
+      Sym : Syment_Acc;
+      --Val : O_Cnode;
+   begin
+      Expect (Tok_Constant);
+      Next_Expect (Tok_Ident);
+      Sym := Token_Sym;
+      N := new Node'(Kind => Node_Object,
+                     Decl_Dtype => null,
+                     Decl_Storage => Storage,
+                     Obj_Name => Sym.Ident,
+                     Obj_Node => O_Dnode_Null);
+      Next_Expect (Tok_Colon);
+      Next_Token;
+      N.Decl_Dtype := Parse_Type;
+      New_Const_Decl (N.Obj_Node, Sym.Ident, Storage, N.Decl_Dtype.Type_Onode);
+      Add_Decl (Sym, N);
+
+--        if Storage /= O_Storage_External then
+--           Expect (Tok_Assign);
+--           Next_Token;
+--           Start_Const_Value (N.Obj_Node);
+--           Val := Parse_Constant_Value (N.Decl_Dtype);
+--           Finish_Const_Value (N.Obj_Node, Val);
+--        end if;
+   end Parse_Constant_Declaration;
+
+   procedure Parse_Constant_Value_Declaration
+   is
+      N : Node_Acc;
+      Val : O_Cnode;
+   begin
+      Next_Expect (Tok_Ident);
+      N := Get_Decl (Token_Sym);
+      if N.Kind /= Node_Object then
+         Parse_Error ("name of a constant expected");
+      end if;
+      --  FIXME: should check storage,
+      --         should check the object is a constant,
+      --         should check the object has no value.
+      Next_Expect (Tok_Assign);
+      Next_Token;
+      Start_Const_Value (N.Obj_Node);
+      Val := Parse_Constant_Value (N.Decl_Dtype);
+      Finish_Const_Value (N.Obj_Node, Val);
+   end Parse_Constant_Value_Declaration;
+
+   procedure Parse_Var_Declaration (Storage : O_Storage)
+   is
+      N : Node_Acc;
+      Sym : Syment_Acc;
+   begin
+      Expect (Tok_Var);
+      Next_Expect (Tok_Ident);
+      Sym := Token_Sym;
+      N := new Node'(Kind => Node_Object,
+                     Decl_Dtype => null,
+                     Decl_Storage => Storage,
+                     Obj_Name => Sym.Ident,
+                     Obj_Node => O_Dnode_Null);
+      Next_Expect (Tok_Colon);
+      Next_Token;
+      N.Decl_Dtype := Parse_Type;
+      New_Var_Decl (N.Obj_Node, Sym.Ident, Storage, N.Decl_Dtype.Type_Onode);
+      Add_Decl (Sym, N);
+   end Parse_Var_Declaration;
+
+   procedure Parse_Stored_Decl (Storage : O_Storage)
+   is
+   begin
+      Next_Token;
+      if Tok = Tok_Function then
+         Parse_Function_Definition (Storage);
+      elsif Tok = Tok_Procedure then
+         Parse_Procedure_Definition (Storage);
+      elsif Tok = Tok_Constant then
+         Parse_Constant_Declaration (Storage);
+      elsif Tok = Tok_Var then
+         Parse_Var_Declaration (Storage);
+      else
+         Parse_Error ("function declaration expected");
+      end if;
+   end Parse_Stored_Decl;
+
+   procedure Parse_Declaration
+   is
+      Inter : Node_Acc;
+      S : Syment_Acc;
+   begin
+      if Flag_Renumber then
+         New_Debug_Line_Decl (Lineno);
+      end if;
+
+      case Tok is
+         when Tok_Type =>
+            Next_Token;
+            if Tok /= Tok_Ident then
+               Parse_Error ("identifier for type expected");
+            end if;
+            S := Token_Sym;
+            Next_Expect (Tok_Is);
+            Next_Token;
+            if Is_Defined (S) then
+               Parse_Type_Completion (Get_Decl (S));
+            else
+               Inter := new Node'(Kind => Decl_Type,
+                                  Decl_Storage => O_Storage_Public,
+                                  Decl_Dtype => Parse_Type);
+               Add_Decl (S, Inter);
+               New_Type_Decl (S.Ident, Inter.Decl_Dtype.Type_Onode);
+            end if;
+         when Tok_External =>
+            Parse_Stored_Decl (O_Storage_External);
+         when Tok_Private =>
+            Parse_Stored_Decl (O_Storage_Private);
+         when Tok_Public =>
+            Parse_Stored_Decl (O_Storage_Public);
+         when Tok_Local =>
+            Parse_Stored_Decl (O_Storage_Local);
+         when Tok_Constant =>
+            Parse_Constant_Value_Declaration;
+         when Tok_Comment =>
+            New_Debug_Comment_Decl (Token_Ident (1 .. Token_Idlen));
+            Next_Token;
+            return;
+         when Tok_File_Name =>
+            if Flag_Renumber = False then
+               New_Debug_Filename_Decl (Token_Ident (1 .. Token_Idlen));
+            end if;
+            Next_Token;
+            return;
+         when others =>
+            Parse_Error ("declaration expected");
+      end case;
+      Expect (Tok_Semicolon);
+      Next_Token;
+   end Parse_Declaration;
+
+--    procedure Put (Str : String)
+--    is
+--       L : Integer;
+--    begin
+--       L := Write (Standout, Str'Address, Str'Length);
+--    end Put;
+
+   function Parse (Filename : String_Acc) return Boolean
+   is
+   begin
+      --  Initialize symbol table.
+      Add_Keyword ("type", Tok_Type);
+      Add_Keyword ("return", Tok_Return);
+      Add_Keyword ("if", Tok_If);
+      Add_Keyword ("then", Tok_Then);
+      Add_Keyword ("else", Tok_Else);
+      Add_Keyword ("elsif", Tok_Elsif);
+      Add_Keyword ("loop", Tok_Loop);
+      Add_Keyword ("exit", Tok_Exit);
+      Add_Keyword ("next", Tok_Next);
+      Add_Keyword ("signed", Tok_Signed);
+      Add_Keyword ("unsigned", Tok_Unsigned);
+      Add_Keyword ("float", Tok_Float);
+      Add_Keyword ("is", Tok_Is);
+      Add_Keyword ("of", Tok_Of);
+      Add_Keyword ("all", Tok_All);
+      Add_Keyword ("not", Tok_Not);
+      Add_Keyword ("abs", Tok_Abs);
+      Add_Keyword ("or", Tok_Or);
+      Add_Keyword ("and", Tok_And);
+      Add_Keyword ("xor", Tok_Xor);
+      Add_Keyword ("mod", Tok_Mod);
+      Add_Keyword ("rem", Tok_Rem);
+      Add_Keyword ("array", Tok_Array);
+      Add_Keyword ("access", Tok_Access);
+      Add_Keyword ("record", Tok_Record);
+      Add_Keyword ("union", Tok_Union);
+      Add_Keyword ("end", Tok_End);
+      Add_Keyword ("boolean", Tok_Boolean);
+      Add_Keyword ("enum", Tok_Enum);
+      Add_Keyword ("external", Tok_External);
+      Add_Keyword ("private", Tok_Private);
+      Add_Keyword ("public", Tok_Public);
+      Add_Keyword ("local", Tok_Local);
+      Add_Keyword ("procedure", Tok_Procedure);
+      Add_Keyword ("function", Tok_Function);
+      Add_Keyword ("constant", Tok_Constant);
+      Add_Keyword ("var", Tok_Var);
+      Add_Keyword ("subarray", Tok_Subarray);
+      Add_Keyword ("declare", Tok_Declare);
+      Add_Keyword ("begin", Tok_Begin);
+      Add_Keyword ("end", Tok_End);
+      Add_Keyword ("null", Tok_Null);
+      Add_Keyword ("case", Tok_Case);
+      Add_Keyword ("when", Tok_When);
+      Add_Keyword ("default", Tok_Default);
+
+      Id_Address := New_Symbol ("address");
+      Id_Unchecked_Address := New_Symbol ("unchecked_address");
+      Id_Subprg_Addr := New_Symbol ("subprg_addr");
+      Id_Conv := New_Symbol ("conv");
+      Id_Sizeof := New_Symbol ("sizeof");
+      Id_Alignof := New_Symbol ("alignof");
+      Id_Alloca := New_Symbol ("alloca");
+      Id_Offsetof := New_Symbol ("offsetof");
+
+      --  Initialize the scanner.
+      Buf (1) := NUL;
+      Pos := 1;
+      Lineno := 1;
+      if Filename = null then
+         Fd := Standin;
+         File_Name := new String'("*stdin*");
+      else
+         declare
+            Name : String (1 .. Filename'Length + 1);
+            --("C:\cygwin\home\tgingold\src\ortho\x86\tests\olang\ex2.ol",
+         begin
+            Name (1 .. Filename'Length) := Filename.all;
+            Name (Name'Last) := NUL;
+            File_Name := Filename;
+            Fd := Open_Read (Name'Address, Text);
+            if Fd = Invalid_FD then
+               Puterr ("cannot open '" & Filename.all & ''');
+               Newline_Err;
+               return False;
+            end if;
+         end;
+      end if;
+
+      New_Debug_Filename_Decl (File_Name.all);
+
+      Push_Scope;
+      Next_Token;
+      while Tok /= Tok_Eof loop
+         Parse_Declaration;
+      end loop;
+      Pop_Scope;
+
+      if Fd /= Standin then
+         Close (Fd);
+      end if;
+      return True;
+   exception
+      when E : others =>
+         Puterr (Ada.Exceptions.Exception_Information (E));
+         raise;
+   end Parse;
+end Ortho_Front;