[ExceptionDemo] Correct and update example ExceptionDemo

[epitavy]

The ExceptionDemo example was no longer compiling (since llvm 14 at least). The PR makes the example work with the current API and also transition from MCJIT to ORC.
Fixes #63702

[github-actions]

✅ With the latest revision this PR passed the C/C++ code formatter.

[joker-eph]

This is switching to OrcJit, so maybe @lhames can help review this example?

Also seems like no bot is building with LLVM_ENABLE_EH and the examples enabled?

[epitavy]

ping

[lhames]

This should not be needed on top-of-tree: LLJIT now reflects process symbols by default.

[lhames]

Otherwise LGTM.

[epitavy]

That true, I just removed the corresponding code

[lhames]

LGTM. Thanks @epitavy!

[epitavy]

Thanks @lhames .
I am not sure of the next steps. I rebased this branch onto main but I don't have the commit permission

[epitavy]

Ping @lhames

[kmistryic]

@epitavy , can you rebase and follow guideline here https://llvm.org/docs/GitHub.html

[epitavy]

@kmistryic The rebase is done, I messed up a little bit with the commit history, but it should be clean. Can you land the changes ? I don't have commit permission to do it

[kamleshbhalui]

@epitavy , Have you tested locally with below command?
cmake ../llvm -DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_EH=ON -DLLVM_ENABLE_RTTI=ON -DLLVM_BUILD_EXAMPLES=ON

[kamleshbhalui]

I just tried It still failing but different error now.

[epitavy]

Right, I missed an error because I didn't build with debug enabled, so assertions were removed. It's fixed now.

[epitavy]

ping @kamleshbhalui

[epitavy]

@lhames

[lhames]

@epitavy Sorry I didn't get to this earlier -- I've been busy with a relocation. @kamleshbhalui -- thanks very much for landing!

[kamleshbhalui]

@epitavy Please have a look at it again

[epitavy]

It is still not building correctly ?

[kamleshbhalui]

Correct, test by executing the ExceptionDemo once build succeed.

[epitavy]

It works as expected for me, except that some values are wrong.

Gen: About to throw exception type <2> in throwFunct.
Gen: Exception type <96> received (stack unwound)  in innerCatchFunct.
                    ^^^^

96 should be 2, but the bug was already here, and I don't know how to fix that

[kamleshbhalui]

I have reverted for now, and reopened the issue.

[epitavy]

You expect someone to fix the bug on this pull request ? I am not sure about the process to follow

[epitavy]

I think I fixed the bug, where should I push the patch ?

[kamleshbhalui]

Can you share entire execution log of ExceptionDemo here?

[kamleshbhalui]

I think you have to create new PR with all the change, you can mention this PR there.

[epitavy]

Can you share entire execution log of ExceptionDemo here?

I share the log on the new PR