152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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// $XConsortium: test18.C /main/4 1996/09/27 19:03:20 drk $
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#include <stdio.h>
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#include "Exceptions.hh"
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#include <signal.h>
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/*
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This test case illustrates a problem that isn't handled by the current
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exceptions library. BaseClass contains two Destructable members whose
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constructor throws an exception. When this happens, the exceptions
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library calls the destructors of all members, constructed or not. This
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means that the Destructable destructor of m2 is called even though it
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wasn't constructed. This is probably just dumb luck, because nothing
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says that the virtual table of m2 should already have the pointer to
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the destructor filled in. For some reason it does. It seems like the
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compiler should be smarter about this and maybe not call it, but we're
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kind of stuck.
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One way to handle this would be to remember all Destructable objects
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that are constructed on the Jump_Environment stack, but only destroy
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those that don't have the f_registered (or f_destroy) flag set. Then
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we can tell if an object has been constructed by comparing it's address
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to the object on the top of the stack. Actually, we'd need two separate
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stacks because with one stack the members would have been removed before
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we get to the object that contains them. We're not going to implement
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this because throwing an exception from a constructor is too dangerous
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with the current language language definition anyhow.
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16:56 22-May-93 DJB
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*/
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void
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catch_abort (int, ...)
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{
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puts ("Abort (core not dumped)");
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// Exit normally so Purify can report.
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exit (1);
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}
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class MemberClass : public Destructable
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{
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public:
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char *name;
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MemberClass (char *s)
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: name(s)
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{ printf ("Constructing MemberClass `%s' @ 0x%p\n", name, this);
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throw (Exception()); }
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~MemberClass()
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{ printf ("Destructing MemberClass\n", name); }
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};
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class BaseClass : public Destructable
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{
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public:
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MemberClass m1, m2;
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BaseClass()
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: m1("m1"), m2("m2")
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{
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puts ("Constructing BaseClass");
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throw (Exception());
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}
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~BaseClass()
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{ puts ("Destructing BaseClass"); }
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};
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class DerivedClass : public BaseClass
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{
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public:
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MemberClass m3;
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DerivedClass()
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: m3("m3")
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{ puts ("Constructing DerivedClass"); }
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~DerivedClass()
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{ puts ("Destructing DerivedClass"); }
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};
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class ErrorString : public Exception
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{
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public:
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DECLARE_EXCEPTION (ErrorString, Exception);
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ErrorString (char *s)
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{ msg = s; }
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char *msg;
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};
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void
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do_something()
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{
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printf ("Calling do_something()\n");
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DerivedClass derived_class;
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throw (ErrorString ("Tossed my cookies in do_something"));
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}
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int
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main()
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{
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INIT_EXCEPTIONS();
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printf ("Sizeof Destructable = %d\n", (int)sizeof (Destructable));
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puts ("Test of throw from multiple member constructor.");
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#ifdef MUST_EXIT
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signal (SIGABRT, catch_abort);
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#endif
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try
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{
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do_something();
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}
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// Do it right in this section.
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catch (ErrorString &,e)
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{
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puts ("Caught exception back in main.");
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puts (e.msg);
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}
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catch (Exception &,e)
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{
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puts ("Caught a vanilla exception.");
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}
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end_try;
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}
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