(* M2EXCEPTION.mod implements access to the exception state.

Copyright (C) 2003-2024 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.

This file is part of GNU Modula-2.

GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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/>.  *)

IMPLEMENTATION MODULE M2EXCEPTION ;

IMPORT RTExceptions ;
FROM SYSTEM IMPORT ADR ;


PROCEDURE M2Exception () : M2Exceptions ;
  (* If the current coroutine is in the exceptional execution state because of the raising
     of a language exception, returns the corresponding enumeration value, and otherwise
     raises an exception.
  *)
BEGIN
   IF IsM2Exception()
   THEN
      RETURN( VAL(M2Exceptions, RTExceptions.GetNumber(RTExceptions.GetExceptionBlock())) )
   ELSE
      RTExceptions.Raise(ORD(exException),
                         ADR(__FILE__), __LINE__, __COLUMN__, ADR(__FUNCTION__),
                         ADR('current coroutine is not in the exceptional execution state'))
   END
END M2Exception ;


PROCEDURE IsM2Exception () : BOOLEAN ;
  (* If the current coroutine is in the exceptional execution state because of the raising
     of a language exception, returns TRUE, and otherwise returns FALSE.
  *)
BEGIN
   RETURN(
          RTExceptions.IsInExceptionState() AND
          (RTExceptions.GetBaseExceptionBlock()=RTExceptions.GetExceptionBlock())
         )
END IsM2Exception ;


END M2EXCEPTION.