Kröhnert, Manfred <manfred.kroehn...@kit.edu> wrote on 02/08/2011 02:49:01
PM:
> Hello everyone,
>
> I have a problem with the attached test program.
>
> It declares a class 'Base' and two other classes 'B' and 'C' which
> extend 'Base'.
> On each class a method 'asC(): C' is implemented which returns an
> instance of Class 'C'.
> The class 'Base' contains a static cast operator which invokes 'asC()'
> on the given object.
>
> Afterwards instances of 'B' and 'C' are created in two different ways
> and the objects are then cast to type 'C' by invoking the 'as C'
> operator and by calling the 'asC()' method.
>
> I would expect the program to behave the same in all occasions but it
> aborts with a ClassCastException and produces the following output:
>
> b: 15
> b as C: 42
> Uncaught exception at place 0: x10.lang.MultipleExceptions: null
> c: 51
> x10.lang.ClassCastException: null
> c as C: 51
>
> b2: 15
> b2 as C: 42
> c2: 51
> c2 as C: 51
>
> b3: 15
> at x10::lang::Throwable::fillInStackTrace()
> at x10aux::throwClassCastException()
> at x10aux::ref<C> x10aux::real_class_cast<C>(x10aux::ref<x10::
> lang::Reference>, bool)
> at x10aux::ClassCastNotPrimitive<x10aux::ref<C>, x10aux::ref<Base>
> >::_(x10aux::ref<Base>, bool)
> at x10aux::ClassCastPrimitive<x10aux::ref<C>, x10aux::ref<Base> >::
> _(x10aux::ref<Base>, bool)
> at x10aux::ClassCast<x10aux::ref<C>, x10aux::ref<Base> >::
> _(x10aux::ref<Base>, bool)
> at x10aux::ref<C> x10aux::class_cast<x10aux::ref<C>, x10aux::
> ref<Base> >(x10aux::ref<Base>)
> at Hello::main(x10aux::ref<x10::array::Array<x10aux::ref<x10::
> lang::String> > >)
> at x10aux::BootStrapClosure::apply()
> at x10_lang_Runtime__closure__2::apply()
> at x10::lang::Activity::run()
> at x10::lang::Runtime__Worker::loop(x10aux::ref<x10::lang::
> SimpleLatch>, bool)
> at x10::lang::Runtime__Worker::apply()
> at x10::lang::Runtime__Pool::apply()
> at x10::lang::Runtime::start(x10aux::ref<x10::lang::VoidFun_0_0>,
> x10aux::ref<x10::lang::VoidFun_0_0>)
> at int x10aux::template_main<x10::lang::Runtime, Hello>(int, char**)
> at main
> at start
>
> Is this a bug in the compiler or in the runtime or is it expected
behaviour?
> I am using the C++ backend with X10DT 2.1.1 on OS X 10.6.6 (Intel).
Manfred,
This list strips attachments. If the program is small enough, please
include it verbatim. Otherwise, please either open a JIRA (if you believe
that this disagrees with the language specification) or try to reduce this
to a small test case that can be posted verbatim.
Thanks,
Igor
--
Igor Peshansky (note the spelling change!)
IBM T.J. Watson Research Center
X10: Parallel Productivity and Performance (http://x10-lang.org/)
XJ: No More Pain for XML's Gain (http://www.research.ibm.com/xj/)
"I hear and I forget. I see and I remember. I do and I understand" --
Xun Zi
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