------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUN-TIME COMPONENTS                         --
--                                                                          --
--                  S Y S T E M . I M G _ E N U M _ N E W                   --
--                                                                          --
--                                 S p e c                                  --
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--          Copyright (C) 2000-2009, Free Software Foundation, Inc.         --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception,   --
-- version 3.1, as published by the Free Software Foundation.               --
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-- You should have received a copy of the GNU General Public License and    --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- <http://www.gnu.org/licenses/>.                                          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

--  Enumeration_Type'Image for all enumeration types except those in package
--  Standard (where we have no opportunity to build image tables), and in
--  package System (where it is too early to start building image tables).
--  Special routines exist for the enumeration types in these packages.

--  This is the new version of the package, for use by compilers built after
--  Nov 21st, 2007, which provides procedures that avoid using the secondary
--  stack. The original package System.Img_Enum is maintained in the sources
--  for bootstrapping with older versions of the compiler which expect to find
--  functions in this package.

pragma Compiler_Unit;

package System.Img_Enum_New is
   pragma Pure;

   procedure Image_Enumeration_8
     (Pos     : Natural;
      S       : in out String;
      P       : out Natural;
      Names   : String;
      Indexes : System.Address);
   --  Used to compute Enum'Image (Str) where Enum is some enumeration type
   --  other than those defined in package Standard. Names is a string with
   --  a lower bound of 1 containing the characters of all the enumeration
   --  literals concatenated together in sequence. Indexes is the address of
   --  an array of type array (0 .. N) of Natural_8, where N is the number of
   --  enumeration literals in the type. The Indexes values are the starting
   --  subscript of each enumeration literal, indexed by Pos values, with an
   --  extra entry at the end containing Names'Length + 1. The reason that
   --  Indexes is passed by address is that the actual type is created on the
   --  fly by the expander. The desired 'Image value is stored in S (1 .. P)
   --  and P is set on return. The caller guarantees that S is long enough to
   --  hold the result and that the lower bound is 1.

   procedure Image_Enumeration_16
     (Pos     : Natural;
      S       : in out String;
      P       : out Natural;
      Names   : String;
      Indexes : System.Address);
   --  Identical to Set_Image_Enumeration_8 except that it handles types
   --  using array (0 .. Num) of Natural_16 for the Indexes table.

   procedure Image_Enumeration_32
     (Pos     : Natural;
      S       : in out String;
      P       : out Natural;
      Names   : String;
      Indexes : System.Address);
   --  Identical to Set_Image_Enumeration_8 except that it handles types
   --  using array (0 .. Num) of Natural_32 for the Indexes table.

end System.Img_Enum_New;
