llvm dev - Oct 2017 - Debugging JIT'ed code with ORC JIT?

Hi,

I’m wondering if it’s possible to debug code JIT’ed with the newer ORC JIT. The
LLVM documentation has a page at

    llvm.org/docs/DebuggingJITedCode.html
<http://llvm.org/docs/DebuggingJITedCode.html>

showing an example of using gdb to debug MCJIT’ed code, but has no mention of
ORC JIT.

From searching around online I’ve gotten the impression that ORC JIT does *not*
support providing debugging information to attached debuggers, but no definitive
source. Is it the case that ORC JIT in fact does support debugging, and if so,
are there examples available; or is my initial impression correct?

Thanks,
Connor
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That is correct – there is no built-in support. You have to provide your
own Registrar to the ObjectLinkingLayer to provide this sort of
functionality. (For example JuliaLang does that at
https://github.com/JuliaLang/julia/blob/1216e5f60cd2b23e29856b5227399ab0f3abef76/src/jitlayers.cpp#L437,
in addition to registering the function pointer and object file info in
several other places).


On Sun, Oct 8, 2017 at 11:48 PM Connor Gray via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hi,
>
> I’m wondering if it’s possible to debug code JIT’ed with the newer ORC
> JIT. The LLVM documentation has a page at
>
>     llvm.org/docs/DebuggingJITedCode.html
>
> showing an example of using gdb to debug MCJIT’ed code, but has no mention
> of ORC JIT.
>
> From searching around online I’ve gotten the impression that ORC JIT does
> *not* support providing debugging information to attached debuggers, but no
> definitive source. Is it the case that ORC JIT in fact does support
> debugging, and if so, are there examples available; or is my initial
> impression correct?
>
> Thanks,
> Connor
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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Hi Connor,

...The LLVM documentation has a page at
>     llvm.org/docs/DebuggingJITedCode.html
> showing an example of using gdb to debug MCJIT’ed code, but has no mention
> of ORC JIT.

What debugging support MCJIT has is provided by the RuntimeDyld utility,
which ORC shares. I would expect anything in that document to apply to ORC
as well, though I haven't tested it personally.

For what it's worth, this is something I'm interested in and hope to
make
some progress on in tree in the not too distant future.

-- Lang.

On Mon, Oct 9, 2017 at 12:27 PM, Jameson Nash via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> That is correct – there is no built-in support. You have to provide your
> own Registrar to the ObjectLinkingLayer to provide this sort of
> functionality. (For example JuliaLang does that at https://github.com/
> JuliaLang/julia/blob/1216e5f60cd2b23e29856b5227399a
> b0f3abef76/src/jitlayers.cpp#L437, in addition to registering the
> function pointer and object file info in several other places).
>
>
> On Sun, Oct 8, 2017 at 11:48 PM Connor Gray via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Hi,
>>
>> I’m wondering if it’s possible to debug code JIT’ed with the newer ORC
>> JIT. The LLVM documentation has a page at
>>
>>     llvm.org/docs/DebuggingJITedCode.html
>>
>> showing an example of using gdb to debug MCJIT’ed code, but has no
>> mention of ORC JIT.
>>
>> From searching around online I’ve gotten the impression that ORC JIT
does
>> *not* support providing debugging information to attached debuggers,
but no
>> definitive source. Is it the case that ORC JIT in fact does support
>> debugging, and if so, are there examples available; or is my initial
>> impression correct?
>>
>> Thanks,
>> Connor
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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