Re: [Joeq-devel] ... Checkpointing

[Alan R. <ala...@gm...>]

Hi John,

Late nights and a confused mind.  The problem was as you say, I created a
subclass of Address which panciked the VM.  I have the CP*Address types in
the image now and I am loading them via reflection.

Thanks again,
Al

2008/8/14 John Whaley <joe...@gm...>

> Hmmm, seems like you are trying to construct a CheckpointCodeAddress, which
> calls CodeAddress.<init> in its constructor.  The Address types are not real
> types so that could lead to problems.  You may be able to include more
> information for the Address types in the bootstrap phase to fix this, i.e.
> make sure the Address types get put into the image and there is an
> implementation of CodeAddress.<init> in there.
>
> Some more info about Address types here:
>     http://joeq.sourceforge.net/about/address_types.html
>
> It may be better to make CheckpointCodeAddress not subclass from
> CodeAddress but just be a totally separate thing.  I haven't looked at it
> for a while but I don't think there are dependencies that require your type
> to be a subclass of CodeAddress.
>
> -John
>
>
> On Wed, Aug 13, 2008 at 7:36 AM, Alan Ryan <ala...@gm...> wrote:
>
>> ..... this may help piece my mail together...
>>
>>
>> <mat...@vi...>CATE: Begin Allocation.
>> Request to allocate:joeq.Runtime.SystemInterface
>>
>> Allocating entry 0: class joeq.Class.jq_Class size 124 0x829ef40 at 0x8:
>> joeq.Runtime.SystemInterface
>> Thin lock counter overflow, inflating lock...
>> Exception occurred while compiling: joeq.Memory.CodeAddress.<init> ()V
>> Exception: java.lang.NullPointerExceptionjava.lang.NullPointerException
>>         at java.lang.Throwable.fillInStackTrace(Throwable.java:57)
>>         at java.lang.Throwable.<init>(Throwable.java:181)
>>         at java.lang.Exception.<init>(Exception.java:29)
>>         at java.lang.RuntimeException.<init>(RuntimeException.java:32)
>>         at
>> java.lang.NullPointerException.<init>(NullPointerException.java:36)
>>         at
>> joeq.Runtime.ExceptionDeliverer.trap_handler(ExceptionDeliverer.java:49)
>>         at joeq.Class.jq_Reference.getTypeOf(jq_Reference.java:21)
>>         at joeq.Runtime.TypeCheck.checkcast(TypeCheck.java:34)
>>         at joeq.Runtime.Monitor.getMonitor(Monitor.java:138)
>>         at joeq.Runtime.Monitor.monitorenter(Monitor.java:97)
>>         at joeq.Class.jq_Method.compile(jq_Method.java:306)
>>         at .(Native Method)
>>         at
>> joeq.Checkpoint.CheckpointCodeAllocator$CPBootstrapx86CodeBuffer.getCurrentAddress(CheckpointCodeAllocator.
>> java:176)
>> ..
>> ..
>> ..
>> ..
>> ..   at joeq.Class.jq_Method.compile(jq_Method.java:309)
>>         at .(Native Method)
>>         at
>> joeq.Checkpoint.RuntimeBootImage.getOrAllocateObject(RuntimeBootImage.java:221)
>>         at
>> joeq.Checkpoint.jq_Checkpointer.checkPoint(jq_Checkpointer.java:206)
>>         at joeq.Checkpoint.jq_Checkpointer.<init>(jq_Checkpointer.java:74)
>>         at
>> joeq.Scheduler.jq_NativeThread.startCheckpointer(jq_NativeThread.java:902)
>>         at joeq.Checkpoint.CPStub.checkPointHere(CPStub.java:40)
>>         at Loop.main(Loop.java:49)
>>         at
>> joeq.Runtime.ReflectionImpl.invokestatic_V(ReflectionImpl.java:363)
>>         at
>> joeq.Compiler.Reference.x86.x86ReferenceLinker.invokeinterface(x86ReferenceLinker.java:220)
>>         at joeq.Runtime.Reflection.invokestatic_V(Reflection.java:112)
>>         at joeq.Scheduler.jq_MainThread.run(jq_MainThread.java:25)
>>
>>
>>
>>
>> --
>> T: +353 91 512601
>>
>> Dept. of Information Technology.
>> National University of Ireland, Galway
>>
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>


-- 
T: +353 91 512601

Dept. of Information Technology.
National University of Ireland, Galway