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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             L I B . S O R T                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2009, 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 GNAT.Heap_Sort_G;

separate (Lib)

procedure Sort (Tbl : in out Unit_Ref_Table) is

   T : array (0 .. Integer (Tbl'Last - Tbl'First + 1)) of Unit_Number_Type;

   --  Actual sort is done on this copy of the array with 0's origin

   --  subscripts. Location 0 is used as a temporary by the sorting algorithm.

   --  Also the addressing of the table is more efficient with 0's origin,

   --  even though we have to copy Tbl back and forth.

   function Lt_Uname (C1, C2 : Natural) return Boolean;

   --  Comparison routine for comparing Unames. Needed by the sorting routine

   procedure Move_Uname (From : Natural; To : Natural);

   --  Move routine needed by the sorting routine below

   package Sorting is new GNAT.Heap_Sort_G (Move_Uname, Lt_Uname);

   --------------

   -- Lt_Uname --

   --------------

   function Lt_Uname (C1, C2 : Natural) return Boolean is

   begin

      --  Preprocessing data and definition files are not sorted, they are

      --  at the bottom of the list. They are recognized because they are

      --  the only ones without a Unit_Name.

      if Units.Table (T (C1)).Unit_Name = No_Unit_Name then

         return False;

      elsif Units.Table (T (C2)).Unit_Name = No_Unit_Name then

         return True;

      else

         return

           Uname_Lt

             (Units.Table (T (C1)).Unit_Name, Units.Table (T (C2)).Unit_Name);

      end if;

   end Lt_Uname;

   ----------------

   -- Move_Uname --

   ----------------

   procedure Move_Uname (From : Natural; To : Natural) is

   begin

      T (To) := T (From);

   end Move_Uname;

--  Start of processing for Sort

begin

   if T'Last > 0 then

      for I in 1 .. T'Last loop

         T (I) := Tbl (Int (I) - 1 + Tbl'First);

      end loop;

      Sorting.Sort (T'Last);

   --  Sort is complete, copy result back into place

      for I in 1 .. T'Last loop

         Tbl (Int (I) - 1 + Tbl'First) := T (I);

      end loop;

   end if;

end Sort;