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Re: [rvm-research] Adding a new class to the MMTk
by Robin Garner
::
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MMTk is a very restrictive programming environment. Among the things you can't do are:
- Allocate objects
- Trigger read/write barriers
- Throw exceptions
This pretty much excludes calling any java library code.
If you want to do analysis that requires complex data structures, I recommend dumping information to a file (using Log.write*) and analysing it offline. If you really do need to do your analysis/debugging online, go back a few weeks in the archives of this list and you'll see a discussion on how to build complex data structures in uninterruptible code.
If you're debugging MMTk code in a recent version of JikesRVM, the MMTk debugging harness (see the user guide) removes these restrictions :)
Regards,
Robin
Cristian Perfumo wrote:
>Thanks, Dave,
>
>I solved this particular problem by declaring My_class uninterruptible. But I wonder... ¿is there another workaround for it?. If I wanted to use hashtables and complex things within methods of My_class... is there a way of doing it? Of course I just want to do this for debugging information, since it will kill the performance.
>
>Regards.
>
>Cristian
>
>On Tue, Jun 16, 2009 at 12:45 PM, David P Grove <groved@... <mailto:groved@... (javascript:main.compose()>> wrote:
>
> Cristian Perfumo <cperfumo@... <mailto:cperfumo@... (javascript:main.compose()>>
> wrote on 06/16/2009 06:34:41 AM:
>
> > Everything looks fine, I have all the imports needed but after
> > executing "ant" to recompile the RVM i get:
>
>
> > BUILD FAILED
> > /home/cperfumo/jikes/jikesrvm-3.0.1/build.xml:1417: WARNING:
> > UNINTERRUPTIBLE VIOLATION
>
> Take a look at the BootImageWriterOutput.txt file (should be in
> the target/<your-config>) directory. It will have the detailed
> error message. The problem is that an uninterruptible hunk of
> code is calling something that isn't uninterruptible. The
> detailed message will tell you exactly where that is happening.
>
> --dave
>
> ------------------------------------------------------------------------------
> Crystal Reports - New Free Runtime and 30 Day Trial
> Check out the new simplified licensing option that enables unlimited
> royalty-free distribution of the report engine for externally facing
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>
>
>------------------------------------------------------------------------
>
>------------------------------------------------------------------------------
>Crystal Reports - New Free Runtime and 30 Day Trial
>Check out the new simplified licensing option that enables unlimited
>royalty-free distribution of the report engine for externally facing server and web deployment.
>http://p.sf.net/sfu/businessobjects (http://p.sf.net/sfu/businessobjects)
>------------------------------------------------------------------------
>
>_______________________________________________
>Jikesrvm-researchers mailing list
>Jikesrvm-researchers@...
>https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers (https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers)
>
------------------------------------------------------------------------------
Crystal Reports - New Free Runtime and 30 Day Trial
Check out the new simplified licensing option that enables unlimited
royalty-free distribution of the report engine for externally facing
server and web deployment.
http://p.sf.net/sfu/businessobjects
_______________________________________________
Jikesrvm-researchers mailing list
Jikesrvm-researchers@...
https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers
- Allocate objects
- Trigger read/write barriers
- Throw exceptions
This pretty much excludes calling any java library code.
If you want to do analysis that requires complex data structures, I recommend dumping information to a file (using Log.write*) and analysing it offline. If you really do need to do your analysis/debugging online, go back a few weeks in the archives of this list and you'll see a discussion on how to build complex data structures in uninterruptible code.
If you're debugging MMTk code in a recent version of JikesRVM, the MMTk debugging harness (see the user guide) removes these restrictions :)
Regards,
Robin
Cristian Perfumo wrote:
>Thanks, Dave,
>
>I solved this particular problem by declaring My_class uninterruptible. But I wonder... ¿is there another workaround for it?. If I wanted to use hashtables and complex things within methods of My_class... is there a way of doing it? Of course I just want to do this for debugging information, since it will kill the performance.
>
>Regards.
>
>Cristian
>
>On Tue, Jun 16, 2009 at 12:45 PM, David P Grove <groved@... <mailto:groved@... (javascript:main.compose()>> wrote:
>
> Cristian Perfumo <cperfumo@... <mailto:cperfumo@... (javascript:main.compose()>>
> wrote on 06/16/2009 06:34:41 AM:
>
> > Everything looks fine, I have all the imports needed but after
> > executing "ant" to recompile the RVM i get:
>
>
> > BUILD FAILED
> > /home/cperfumo/jikes/jikesrvm-3.0.1/build.xml:1417: WARNING:
> > UNINTERRUPTIBLE VIOLATION
>
> Take a look at the BootImageWriterOutput.txt file (should be in
> the target/<your-config>) directory. It will have the detailed
> error message. The problem is that an uninterruptible hunk of
> code is calling something that isn't uninterruptible. The
> detailed message will tell you exactly where that is happening.
>
> --dave
>
> ------------------------------------------------------------------------------
> Crystal Reports - New Free Runtime and 30 Day Trial
> Check out the new simplified licensing option that enables unlimited
> royalty-free distribution of the report engine for externally facing
> server and web deployment.
> http://p.sf.net/sfu/businessobjects (http://p.sf.net/sfu/businessobjects)
> _______________________________________________
> Jikesrvm-researchers mailing list
> Jikesrvm-researchers@...
> <mailto:Jikesrvm-researchers@... (javascript:main.compose()>
> https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers (https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers)
>
>
>------------------------------------------------------------------------
>
>------------------------------------------------------------------------------
>Crystal Reports - New Free Runtime and 30 Day Trial
>Check out the new simplified licensing option that enables unlimited
>royalty-free distribution of the report engine for externally facing server and web deployment.
>http://p.sf.net/sfu/businessobjects (http://p.sf.net/sfu/businessobjects)
>------------------------------------------------------------------------
>
>_______________________________________________
>Jikesrvm-researchers mailing list
>Jikesrvm-researchers@...
>https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers (https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers)
>
------------------------------------------------------------------------------
Crystal Reports - New Free Runtime and 30 Day Trial
Check out the new simplified licensing option that enables unlimited
royalty-free distribution of the report engine for externally facing
server and web deployment.
http://p.sf.net/sfu/businessobjects
_______________________________________________
Jikesrvm-researchers mailing list
Jikesrvm-researchers@...
https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers
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