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/* Copyright (C) 2008-2025 Free Software Foundation, Inc. */
/* 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 2, 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.
You should have received a copy of the GNU General Public License along
with gm2; see the file COPYING. If not, write to the Free Software
Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <stdio.h>
#include <stdlib.h>
// a c++ example of Modula-2 exception handling
static int *ip = NULL;
void fly (void)
{
printf("fly main body\n") ;
if (ip == NULL)
throw;
if (*ip == 0)
throw;
if (4 / (*ip) == 4)
printf("yes it worked\n");
else
printf("no it failed\n");
}
/*
* a CPP version of the Modula-2 example given in the ISO standard.
* This is a hand translation of the equivalent except2.mod file in this
* directory which is written to prove that the underlying CPP
* runtime system will support ISO Modula-2 exceptions and to reinforce
* my understanding of how the GCC trees are constructed and what
* state is held where..
*/
void tryFlying (void)
{
again_tryFlying:
printf("tryFlying main body\n");
try {
fly() ;
}
catch (...) {
printf("inside tryFlying exception routine\n") ;
if ((ip != NULL) && ((*ip) == 0)) {
*ip = 1;
// retry
goto again_tryFlying;
}
printf("did't handle exception here so we will call the next exception routine\n") ;
throw; // unhandled therefore call previous exception handler
}
}
void keepFlying (void)
{
again_keepFlying:
printf("keepFlying main body\n") ;
try {
tryFlying();
}
catch (...) {
printf("inside keepFlying exception routine\n");
if (ip == NULL) {
ip = (int *)malloc(sizeof(int));
*ip = 0;
goto again_keepFlying;
}
throw; // unhandled therefore call previous exception handler
}
}
main ()
{
keepFlying();
printf("all done\n");
}
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