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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. --
+-- --
+------------------------------------------------------------------------------
+
+-- 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;