gcc/ada/g-comver.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                G N A T . C O M P I L E R _ V E R S I O N                 --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                     Copyright (C) 2002-2010, AdaCore                     --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package provides a routine for obtaining the version number of the
  33 --  GNAT compiler used to compile the program. It relies on the generated
  34 --  constant in the binder generated package that records this information.
  35
  36 package body GNAT.Compiler_Version is
  37
  38    Ver_Len_Max : constant := 256;
  39    --  This is logically a reference to Gnatvsn.Ver_Len_Max but we cannot
  40    --  import this directly since run-time units cannot WITH compiler units.
  41
  42    Ver_Prefix : constant String := "GNAT Version: ";
  43    --  This is logically a reference to Gnatvsn.Ver_Prefix but we cannot
  44    --  import this directly since run-time units cannot WITH compiler units.
  45
  46    GNAT_Version : constant String (1 .. Ver_Len_Max + Ver_Prefix'Length);
  47    pragma Import (C, GNAT_Version, "__gnat_version");
  48
  49    -------------
  50    -- Version --
  51    -------------
  52
  53    function Version return String is
  54    begin
  55       --  Search for terminating right paren or NUL ending the string
  56
  57       for J in Ver_Prefix'Length + 1 .. GNAT_Version'Last loop
  58          if GNAT_Version (J) = ')' then
  59             return GNAT_Version (Ver_Prefix'Length + 1 .. J);
  60          end if;
  61
  62          if GNAT_Version (J) = Character'Val (0) then
  63             return GNAT_Version (Ver_Prefix'Length + 1 .. J - 1);
  64          end if;
  65       end loop;
  66
  67       --  This should not happen (no right paren or NUL found)
  68
  69       return GNAT_Version;
  70    end Version;
  71
  72 end GNAT.Compiler_Version;