gcc/ada/s-except.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                    S Y S T E M . E X C E P T I O N S                     --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2006-2011, Free Software Foundation, Inc.         --
  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 pragma Compiler_Unit;
  33
  34 package System.Exceptions is
  35
  36    pragma Preelaborate_05;
  37    --  To let Ada.Exceptions "with" us and let us "with" Standard_Library
  38
  39    ZCX_By_Default : constant Boolean;
  40    --  Visible copy to allow Ada.Exceptions to know the exception model.
  41
  42 private
  43    type Require_Body;
  44    --  Dummy Taft-amendment type to make it legal (and required) to provide
  45    --  a body for this package.
  46    --
  47    --  We do this because this unit used to have a body in earlier versions
  48    --  of GNAT, and it causes various bootstrap path problems etc if we remove
  49    --  a body, since we may pick up old unwanted bodies.
  50    --
  51    --  Note: we use this standard Ada method of requiring a body rather
  52    --  than the cleaner pragma No_Body because System.Exceptions is a compiler
  53    --  unit, and older bootstrap compilers do not support pragma No_Body. This
  54    --  type can be removed, and s-except.adb can be replaced by a source
  55    --  containing just that pragma, when we decide to move to a 2008 compiler
  56    --  as the minimal bootstrap compiler version. ???
  57
  58    ZCX_By_Default : constant Boolean := System.ZCX_By_Default;
  59
  60    Foreign_Exception : exception;
  61    pragma Unreferenced (Foreign_Exception);
  62    --  This hidden exception is used to represent non-Ada exception to
  63    --  Ada handlers. It is in fact referenced by its linking name.
  64
  65 end System.Exceptions;