llvm dev - Jul 2014 - [LLVMdev] Reminder: Please switch to MCJIT, as the old JIT will be removed soon.

Hi Everyone,

If you're JITing with LLVM and haven't made the switch to MCJIT already,
now is the time. As per discussions on the mailing list and at the last dev
meeting, LLVM 3.5 will be the last release to support the old JIT
infrastructure. Now that LLVM 3.5 has branched, we plan to start removing
the old JIT from the mainline.

If you're looking for help in making the switch, Andy Kaylor wrote a great
LLVM blog post about porting Kaleidoscope to MCJIT, which you can find at
http://blog.llvm.org/2013/07/using-mcjit-with-kaleidoscope-tutorial.html.
I'll also be working to update the LLVM docs and the Kaleidoscope tutorial,
and as always you can ask for help in the mailing lists and on IRC.

Good luck with the switch over!

Cheers,
Lang.
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If you have specific questions about this transition, I might be able
to help out here, as I've gone through this process with Julia (the
process should be a lot smoother now that it's working for a good set
of people, so most bugs should have been found)

Keno

On Fri, Jul 25, 2014 at 3:13 PM, Lang Hames <lhames at gmail.com>
wrote:
> Hi Everyone,
>
> If you're JITing with LLVM and haven't made the switch to MCJIT
already, now
> is the time. As per discussions on the mailing list and at the last dev
> meeting, LLVM 3.5 will be the last release to support the old JIT
> infrastructure. Now that LLVM 3.5 has branched, we plan to start removing
> the old JIT from the mainline.
>
> If you're looking for help in making the switch, Andy Kaylor wrote a
great
> LLVM blog post about porting Kaleidoscope to MCJIT, which you can find at
> http://blog.llvm.org/2013/07/using-mcjit-with-kaleidoscope-tutorial.html.
> I'll also be working to update the LLVM docs and the Kaleidoscope
tutorial,
> and as always you can ask for help in the mailing lists and on IRC.
>
> Good luck with the switch over!
>
> Cheers,
> Lang.
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>

Hi Keno,

Could you give a short high-level overview of the way Julia works now with
MCJIT instead the JIT:

What I gather so far...

* Compiled IR functions are emitted to a shadow module.
* Any used function is cloned into its own new module and the module is
added to MCJIT.
* Called functions or globalvars are only declared in that module.
* Modules are never removed meaning "old" functions are abandoned
rather
then replaced.
* All function calls go through a trampoline function doing the multiple
dispatch, also enabling old function replacement to new version.

Thanks,

Yaron




2014-07-25 22:23 GMT+03:00 Keno Fischer <kfischer at college.harvard.edu>:
> If you have specific questions about this transition, I might be able
> to help out here, as I've gone through this process with Julia (the
> process should be a lot smoother now that it's working for a good set
> of people, so most bugs should have been found)
>
> Keno
>
> On Fri, Jul 25, 2014 at 3:13 PM, Lang Hames <lhames at gmail.com>
wrote:
> > Hi Everyone,
> >
> > If you're JITing with LLVM and haven't made the switch to
MCJIT already,
> now
> > is the time. As per discussions on the mailing list and at the last
dev
> > meeting, LLVM 3.5 will be the last release to support the old JIT
> > infrastructure. Now that LLVM 3.5 has branched, we plan to start
removing
> > the old JIT from the mainline.
> >
> > If you're looking for help in making the switch, Andy Kaylor wrote
a
> great
> > LLVM blog post about porting Kaleidoscope to MCJIT, which you can find
at
> >
http://blog.llvm.org/2013/07/using-mcjit-with-kaleidoscope-tutorial.html
> .
> > I'll also be working to update the LLVM docs and the Kaleidoscope
> tutorial,
> > and as always you can ask for help in the mailing lists and on IRC.
> >
> > Good luck with the switch over!
> >
> > Cheers,
> > Lang.
> >
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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