[RFA/JDWP] Fix ReferenceType.sourceFile

[Kyle Galloway]

Kyle Galloway wrote:
> Kyle Galloway wrote:
>> Currently, since it is possible to get null returned from 
>> _Jv_GetInterpClasssourceFile if the class in either native of if the 
>> information is not available, a call to ReferenceType.sourceFile may 
>> cause a NPE in writeString which will crash the communication thread 
>> causing the VM to stop responding to commands.  This patch fixes this 
>> by checking in VMVirtualMachine::getSourceFile to see if there source 
>> file is null, and throwing an AbsentInformationException.  Though 
>> there are two possible causes for this in our implementation, the 
>> JDWP spec does not distinguish and only allows for an 
>> ABSENT_INFORMATION error in this case.
>>
>> ChangeLog
>> 2007-04-11  Kyle Galloway  <kgallowa@redhat.com>
>>
>>    * gnu/classpath/jdwp/natVMVirtualMachine.cc (getSourceFile): Check
>>    for null source file and throw an exception indicating this.
>>
>> Questions/comments/concerns?
>>
>> Thanks,
>>
>> Kyle
I realized this morning I made a typo and diffed to aousrcefile.patch, 
then submitted the wrong patch.  Here is the correct version with the 
header included.  Sorry about that.

- Kyle
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