RFR [jcov, unfilled]: jcov does not instrument files with NestHost/NestMembers attributes

[Jan Lahoda]

Hello,

I apologize, I forgot to do this. I've filled:
https://bugs.openjdk.java.net/browse/CODETOOLS-7902334
(for the NestHost problem)
https://bugs.openjdk.java.net/browse/CODETOOLS-7902335
(for enhancing the build script with tests)

And put patches that might be suitable for commit here, respectivelly:
http://cr.openjdk.java.net/~jlahoda/jcov-nesthost/webrev.allow.nesthost.00/7902334

http://cr.openjdk.java.net/~jlahoda/jcov-nesthost/webrev.test.00/7902335

I am not a committer on the code-tools project, so I'd like to ask if 
Jon could take a look whether it is fine to apply these commits.

Thanks,
     Jan

On 9.10.2018 18:52, Leonid Kuskov wrote:
> Hi Jan,
>
> Could you please file the bug and apply your changes to
> http://hg.openjdk.java.net/code-tools/jcov/.
> I need to switch jcov to the next version of asm and upload couple fixes
> that needed for JCK.
> This is best done after your fixes.
>
> Thanks,
> Leonid
>
>
> On 8/7/18 08:25, Jan Lahoda wrote:
>> Hi,
>>
>> It seems that jcov cannot instrument files with NestHost/NestMembers
>> attributes (JDK 11 classfiles), and silently uses the original
>> version. The reason appears to be that even though it uses ASM 6.2,
>> which knows about those attributes, the visitors are using "ASM6"
>> compatibility flag, which does not support these attributes.
>>
>> My proposal here is to upgrade the compatibility flag to
>> "ASM7_EXPERIMENTAL" compatibility level. It might be better to define
>> a constant for the compatibility level constant, so that on next
>> upgrade, we don't need to modify so many files. The proposed patch is
>> here:
>> http://cr.openjdk.java.net/~jlahoda/jcov-nesthost/webrev.allow.nesthost.00/
>>
>>
>> Also, we could enhance the build script to allow running tests:
>> http://cr.openjdk.java.net/~jlahoda/jcov-nesthost/webrev.test.00/
>>
>> If these would seem to go in a reasonable direction, I'll file bugs.
>> It may be necessary to do a few more changes to support JDK 12
>> classfiles.
>>
>> Any feedback is welcome!
>>
>> Thanks,
>>     Jan
>