--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-valenu.adb	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,155 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                      S Y S T E M . V A L _ E N U M                       --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          Copyright (C) 1992-2017, Free Software Foundation, Inc.         --
+--                                                                          --
+-- 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- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- 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.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- 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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with Ada.Unchecked_Conversion;
+
+with System.Val_Util; use System.Val_Util;
+
+package body System.Val_Enum is
+
+   -------------------------
+   -- Value_Enumeration_8 --
+   -------------------------
+
+   function Value_Enumeration_8
+     (Names   : String;
+      Indexes : System.Address;
+      Num     : Natural;
+      Str     : String)
+      return    Natural
+   is
+      F : Natural;
+      L : Natural;
+      S : String (Str'Range) := Str;
+
+      type Natural_8 is range 0 .. 2 ** 7 - 1;
+      type Index_Table is array (Natural) of Natural_8;
+      type Index_Table_Ptr is access Index_Table;
+
+      function To_Index_Table_Ptr is
+        new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
+
+      IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
+
+   begin
+      Normalize_String (S, F, L);
+
+      for J in 0 .. Num loop
+         if Names
+           (Natural (IndexesT (J)) ..
+            Natural (IndexesT (J + 1)) - 1) = S (F .. L)
+         then
+            return J;
+         end if;
+      end loop;
+
+      Bad_Value (Str);
+   end Value_Enumeration_8;
+
+   --------------------------
+   -- Value_Enumeration_16 --
+   --------------------------
+
+   function Value_Enumeration_16
+     (Names   : String;
+      Indexes : System.Address;
+      Num     : Natural;
+      Str     : String)
+      return    Natural
+   is
+      F : Natural;
+      L : Natural;
+      S : String (Str'Range) := Str;
+
+      type Natural_16 is range 0 .. 2 ** 15 - 1;
+      type Index_Table is array (Natural) of Natural_16;
+      type Index_Table_Ptr is access Index_Table;
+
+      function To_Index_Table_Ptr is
+        new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
+
+      IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
+
+   begin
+      Normalize_String (S, F, L);
+
+      for J in 0 .. Num loop
+         if Names
+           (Natural (IndexesT (J)) ..
+            Natural (IndexesT (J + 1)) - 1) = S (F .. L)
+         then
+            return J;
+         end if;
+      end loop;
+
+      Bad_Value (Str);
+   end Value_Enumeration_16;
+
+   --------------------------
+   -- Value_Enumeration_32 --
+   --------------------------
+
+   function Value_Enumeration_32
+     (Names   : String;
+      Indexes : System.Address;
+      Num     : Natural;
+      Str     : String)
+      return    Natural
+   is
+      F : Natural;
+      L : Natural;
+      S : String (Str'Range) := Str;
+
+      type Natural_32 is range 0 .. 2 ** 31 - 1;
+      type Index_Table is array (Natural) of Natural_32;
+      type Index_Table_Ptr is access Index_Table;
+
+      function To_Index_Table_Ptr is
+        new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
+
+      IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
+
+   begin
+      Normalize_String (S, F, L);
+
+      for J in 0 .. Num loop
+         if Names
+           (Natural (IndexesT (J)) ..
+            Natural (IndexesT (J + 1)) - 1) = S (F .. L)
+         then
+            return J;
+         end if;
+      end loop;
+
+      Bad_Value (Str);
+   end Value_Enumeration_32;
+
+end System.Val_Enum;