Date: Thu, 10 Oct 2002 11:47:44 -0400 From: "Kevin B. Hendricks" <kevin.hendricks@sympatico.ca> To: dev@porting.openoffice.org, Martin Blapp <mb@imp.ch>, <openoffice@freebsd.org> Cc: <kan@freebsd.org> Subject: Re: [porting-dev] FreeBSD: Uncatched exception problem Message-ID: <200210101147.44472.kevin.hendricks@sympatico.ca> In-Reply-To: <20021010135115.R15308-100000@levais.imp.ch> References: <20021010135115.R15308-100000@levais.imp.ch>
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Hi Martin,
I have learned to NOT trust all breakpoints being reported when hit. I
have seen the problem way to much (as least on ppc). Also single stepping
though an app may not always align with the source code (especially in C++
which has a tendency to put mutliple paths to reach implicit destrcutor
calls that don't really exist in the source code.
So I take gdb with a big grain of salt when debugging at the source code
level (especially C++ generated code).
Also,
Can you refresh my memory on how to recreate this bug on my own box? I
would like to add debug print statements right beofre the the intial throw
and when that throw whould be caught to make sure the exception type is
not the issue.
Kevin
> I'm again trying to solve this. A thing I do not understan is, that
> frame 4 shows __cxa_rethrow, but in single stepping I never hit it, and
> also the breakpoint I hit was not this one.
>
> Does this bring more light into this difficult bug ?
>
> #0 0x28c30d5b in kill () from /usr/lib/libc.so.5
> #1 0x28c8fa44 in abort () from /usr/lib/libc.so.5
> #2 0x28ba8c8f in __cxxabiv1::__terminate(void (*)())
> (handler=0x28c8f9d8 <abort>) at
> /usr/src/contrib/libstdc++/libsupc++/eh_terminate.cc:47
> #3 0x28ba8cd0 in __cxxabiv1::__unexpected(void (*)())
> (handler=0x8125e30) at
> /usr/src/contrib/libstdc++/libsupc++/eh_terminate.cc:57
> #4 0x28ba8c04 in __cxa_rethrow () at
> /usr/src/contrib/libstdc++/libsupc++/eh_throw.cc:77 #5 0x2aa36ac7 in
> SfxFrameLoader::detect(com::sun::star::uno::Sequence<com::sun::star::bea
>ns::PropertyValue>&) () from
> /usr/local/OpenOffice.org1.0/program//libsfx641fi.so
>
> Then I set a break for __cxa_rethrow and __cxa_throw.
>
> Breakpoint 1, __cxa_throw (obj=0x8128250, tinfo=0x2ab68dec,
> dest=0x2aa38f2c
> <com::sun::star::lang::WrappedTargetRuntimeException::~WrappedTargetRunt
>imeException()>) at /usr/src/contrib/libstdc++/libsupc++/eh_throw.cc:58
> 58 __cxa_exception *header = __get_exception_header_from_obj
> (obj); Current language: auto; currently c++
>
> (gdb) p obj
> $6 = (void *) 0x8128250
>
> (gdb) p *dest
> $5 = {void (
> void *)} 0x2aa38f2c
> <com::sun::star::lang::WrappedTargetRuntimeException::~WrappedTargetRunt
>imeException()>
>
> (gdb) p *tinfo
> $2 = {_vptr$type_info = 0x28bbc668,
> __name = 0x2ab554e0
> "N3com3sun4star4lang29WrappedTargetRuntimeExceptionE"}
>
> (gdb) n
> 59 header->exceptionType = tinfo;
> (gdb) n
> 60 header->exceptionDestructor = dest;
> (gdb) n
> 61 header->unexpectedHandler = __unexpected_handler;
> (gdb) n
> 62 header->terminateHandler = __terminate_handler;
> (gdb) n
> 63 header->unwindHeader.exception_class = __gxx_exception_class;
> (gdb) n
> 64 header->unwindHeader.exception_cleanup =
> __gxx_exception_cleanup; (gdb) n
> 66 __cxa_eh_globals *globals = __cxa_get_globals ();
> (gdb) n
> 0x28b7894c in _init () from /usr/lib/libstdc++.so.4
>
> __cxa_throw (obj=0x8128250, tinfo=0x2ab68dec,
> dest=0x2aa38f2c
> <com::sun::star::lang::WrappedTargetRuntimeException::~WrappedTargetRunt
>imeException()>) at /usr/src/contrib/libstdc++/libsupc++/eh_throw.cc:67
> 67 globals->uncaughtExceptions += 1;
>
> (gdb) n
> 72 _Unwind_RaiseException (&header->unwindHeader);
> (gdb) n
> 0x28b777bc in _init () from /usr/lib/libstdc++.so.4
> (gdb) n
> Single stepping until exit from function _init,
> which has no line number information.
> __cxa_throw (obj=0x8128250, tinfo=0x2ab68dec,
> dest=0x2aa38f2c
> <com::sun::star::lang::WrappedTargetRuntimeException::~WrappedTargetRunt
>imeException()>) at /usr/src/contrib/libstdc++/libsupc++/eh_throw.cc:76
> 76 __cxa_begin_catch (&header->unwindHeader);
>
> (gdb) n
> 0x28b782dc in _init () from /usr/lib/libstdc++.so.4
> (gdb) n
> Single stepping until exit from function _init,
> which has no line number information.
>
> Martin
>
> Martin Blapp, <mb@imp.ch> <mbr@FreeBSD.org>
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