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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              C O M P E R R                               --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2007, 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.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  This package contains the routine called when a fatal internal compiler

--  error is detected. Calls to this routines cause termination of the

--  current compilation with appropriate error output.

package Comperr is

   procedure Compiler_Abort

     (X            : String;

      Code         : Integer := 0;

      Fallback_Loc : String := "");

   --  Signals an internal compiler error. Never returns control. Depending on

   --  processing may end up raising Unrecoverable_Error, or exiting directly.

   --  The message output is a "bug box" containing the first string passed as

   --  an argument. The Sloc field of the node in Current_Error_Node is used to

   --  provide the location where the error should be signalled. If this Sloc

   --  value is set to No_Location or any of the other special location values,

   --  then the Fallback_Loc argument string is used instead. The message text

   --  includes the node id, and the code parameter if it is positive.

   --

   --  Note that this is only used at the outer level (to handle constraint

   --  errors or assert errors etc.) In the normal logic of the compiler we

   --  always use pragma Assert to check for errors, and if necessary an

   --  explicit abort is achieved by pragma Assert (False). Code is positive

   --  for a gigi abort (giving the gigi abort code), zero for a front

   --  end exception (with possible message stored in TSD.Current_Excep,

   --  and negative (an unused value) for a GCC abort.

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

   -- Use of gnat_bug.box File --

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

   --  When comperr generates the "bug box". The first two lines contain

   --  information on the version number, type of abort, and source location.

   --  Normally the remaining text is one of three possible forms

   --  depending on Gnatvsn.Gnat_Version_Type (FSF, Public, GNATPRO).

   --  See body of this package for the exact text used.

   --  In addition, an alternative mechanism exists for easily substituting

   --  different text for this message. Compiler_Abort checks for the

   --  existence of the file "gnat_bug.box" in the current source path.

   --  Most typically this file, if present, will be in the directory

   --  containing the run-time sources.

   --  If this file is present, then it is a plain ASCII file, whose contents

   --  replace the remaining text. The lines in this file should be seventy-two

   --  characters or less to avoid misformatting the right boundary of the box.

   --  Note that the file does not contain the vertical bar characters or any

   --  leading spaces in lines.

end Comperr;