gcc/m2/gm2-libs-iso/M2EXCEPTION.mod

   1 (* M2EXCEPTION.mod implements access to the exception state.
   2
   3 Copyright (C) 2003-2024 Free Software Foundation, Inc.
   4 Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
   5
   6 This file is part of GNU Modula-2.
   7
   8 GNU Modula-2 is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GNU Modula-2 is distributed in the hope that it will be useful, but
  14 WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 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 IMPLEMENTATION MODULE M2EXCEPTION ;
  28
  29 IMPORT RTExceptions ;
  30 FROM SYSTEM IMPORT ADR ;
  31
  32
  33 PROCEDURE M2Exception () : M2Exceptions ;
  34   (* If the current coroutine is in the exceptional execution state because of the raising
  35      of a language exception, returns the corresponding enumeration value, and otherwise
  36      raises an exception.
  37   *)
  38 BEGIN
  39    IF IsM2Exception()
  40    THEN
  41       RETURN( VAL(M2Exceptions, RTExceptions.GetNumber(RTExceptions.GetExceptionBlock())) )
  42    ELSE
  43       RTExceptions.Raise(ORD(exException),
  44                          ADR(__FILE__), __LINE__, __COLUMN__, ADR(__FUNCTION__),
  45                          ADR('current coroutine is not in the exceptional execution state'))
  46    END
  47 END M2Exception ;
  48
  49
  50 PROCEDURE IsM2Exception () : BOOLEAN ;
  51   (* If the current coroutine is in the exceptional execution state because of the raising
  52      of a language exception, returns TRUE, and otherwise returns FALSE.
  53   *)
  54 BEGIN
  55    RETURN(
  56           RTExceptions.IsInExceptionState() AND
  57           (RTExceptions.GetBaseExceptionBlock()=RTExceptions.GetExceptionBlock())
  58          )
  59 END IsM2Exception ;
  60
  61
  62 END M2EXCEPTION.