[LLVMdev] Function calls only being JIT'd once by Kaleidoscope with MCJIT?

[Lang Hames]

No progress since Charlie last looked at it. As Per suggested, it may be
worth adding an explicit #error, or at least a comment, noting that the
later examples are broken.

Going forward, I see three options:

(1) Remove the old tutorials entirely, and encourage people to check out
the MCJIT and Orc versions.
(2) Build an Orc-based stack that approximates the behavior of the Old JIT
(which the old tutorials assume).
(3) Rewrite the old tutorial to natively use the new APIs.

I much prefer the third option. The first option misses out on a lot of
language/API discussion that's contained in the later chapters of the old
tutorials. The second option replicates a JIT stack that wouldn't be useful
for most clients.

If we were going to pursue option three, the simple JIT from the
Orc/initial tutorial seems like a good starting point to re-write the old
tutorials. Then we'd have an interesting bifurcation part way through the
tutorial series: Go one way and add new language features on top of the
simple JIT, or go another and add features to the JIT while keeping the
language steady. Cross-polination of the two branches (new JIT features +
new language features) could be handled in future tutorials, or left as an
exercise for the reader.

The tricky part, as usual, is finding the time to do this.
Volunteers/patches welcome. :)

Cheers,
Lang.


On Tue, Apr 21, 2015 at 9:16 AM, David Blaikie <dblaikie at gmail.com> wrote:

>
>
> On Tue, Apr 21, 2015 at 7:26 AM, Per Mildner <Per.Mildner at sics.se> wrote:
>
>> Charlie Turner <charlesturner7c5 <at> gmail.com> writes:
>>
>> > I was planning on committing these changes with the corresponding
>> > changes to the Kaleidoscope tutorial walk-through. Might be a bit of a
>> > surprise to have no explanation of what MCJITHelper and friends is
>> > doing.
>> >
>> > I'll try and make time to prepare some patches along these lines, as
>> > well as updating future chapters with the same fix.
>> >
>> > Thanks for taking a look :)
>>
>>
>> Any progress on fixing the tutorial?
>>
>> I am about to dive into LLVM and after some hair-pulling found that the
>> Kaleidoscope tutorials (from part 5 onwards), are broken.
>>
>> Obviously this is not a good first impression.
>>
>> (even a note in the source code, #error "currently does not work", would
>> be
>> a huge improvement, since it would avoid a lot of wasted time for the
>> beginner.)
>>
>> PS. On OS X 10.8.5, the compile command for part 4 of the tutorial needs
>> -fno-rtti, presumably because the code now inherits from a LLVM class.
>>
>
> Lang - recall what the state is here?
>
>
>>
>> Regards,
>>
>> Per Mildner
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150421/53e29065/attachment.html>