[llvm-dev] LLVM 10 ORC2 issue with symbol resolution

[Lang Hames via llvm-dev]

Hi Dibyendu,

I updated my project to LLVM 10.0 today and I am getting JIT
> symbol resolution errors.
> I could not find any example or updated tutorial or documentation
> that describes the new api - as all documentation seems out of date.


The doxygen comments should be up-to-date, as should
http://llvm.org/docs/ORCv2.html. You can find up-to-date example code for
LLJIT in llvm/examples/LLJITExamples (LLVM 10) or
llvm/examples/OrcV2Examples (master). If you come across any documentation
in master that appears to be out of date please let me know and I will fix
it.

The BuildingAJIT tutorial series is known to be out of date. I'm hoping to
have that fixed by LLVM 11 but there is some feature work that I need to
complete first.

Can you share the specific errors that you're getting back? I would
recommend replacing

cantFail(callToFailingFunc(...));

with

logAllUnhandledErrors(callToFailingFunc(...), errs(),
"callToFailingFunc(...) failed:");

Regards,
Lang.

On Mon, Apr 13, 2020 at 10:06 AM Dibyendu Majumdar <mobile at majumdar.org.uk>
wrote:

> Hi,
>
> I updated my project to LLVM 10.0 today and I am getting JIT symbol
> resolution errors.
> I could not find any example or updated tutorial or documentation that
> describes the new api - as all documentation seems out of date.
>
> I paste below some code snippets that show what I am doing:
>
> /* global syms is a array mapping names to function addresses */
>
> ES->createJITDylib("<main>");
> MainJD = ES->getJITDylibByName("<main>");
> MainJD->addGenerator(
>
> cantFail(llvm::orc::DynamicLibrarySearchGenerator::GetForCurrentProcess(
>         DL->getGlobalPrefix())));
> auto &JD = *MainJD;
> llvm::orc::MangleAndInterner mangle(*ES, *this->DL);
> llvm::orc::SymbolMap Symbols;
> for (int i = 0; global_syms[i].name != nullptr; i++) {
>   Symbols.insert({mangle(global_syms[i].name),
>
>
> llvm::JITEvaluatedSymbol(llvm::pointerToJITTargetAddress(global_syms[i].address),
>
> llvm::JITSymbolFlags(llvm::JITSymbolFlags::FlagNames::Absolute))});
> }
> llvm::cantFail(JD.define(llvm::orc::absoluteSymbols(Symbols)), "Failed
> to install extern symbols");
>
> FYI - my previous post on similar issue.
> Basically I haven't been able to get ORC v2 working - tried in 8, 9 and
> now 10.
>
>
> http://llvm.1065342.n5.nabble.com/llvm-dev-ORC-v2-question-tp130489p130601.html
>
> Thanks and Regards
> Dibyendu
>
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