[LLVMdev] exception cleanup examples (was: status: llvm-stack-switch)

[Charllls Alquarra]

Hi,


>Am 02.05.2011 um 11:05 schrieb Anton Korobeynikov:
>
>> Hello Toralf,
>> 
>>> I wanted to ask what the current status of llvm-stack-switch[1] is.
>> Given that this project never appeared in this mailing list - have you
>> tried to ask its author?
>
>It is on the mailing list. This is how I found this project.
>http://lists.cs.uiuc.edu/pipermail/llvmdev/2010-April/030787.html
>
>But I couldn't find any updates after this thread.
>
>Toralf Niebuhr

I am trying to implement something like this using boost.context library; in my case, the scope of usage is more limited, in the sense that i don't want to spawn coroutines from the language, but actually just embed the compiled code inside coroutines/user space threads/or how we want to call it.

I have some trouble figuring out the best way to do the cleanups for stack-allocated non-POD objects, which have to happen both at the exit of each function (easy) but also if i decide for some reason to kill the coroutine (for example, in case of a runtime error). I know there is exception handling primitives on LLVM (http://llvm.org/docs/ExceptionHandling.html) that could help me do this but what i wanted is to look at some examples, the Kaleidoscope example doesn't do exception handling, and it seems that there is still some strong development happening on the EH primitives: http://lists.cs.uiuc.edu/pipermail/llvmdev/2010-December/036769.html

if someone knows some publicly available examples that make basic usage of llvm exception handling primitives it would be great. I don't need error handling per se, just details on how to setup the cleanup code generation


@Toralf, in your case, if i would be after full blown support of coroutines, i would try by generating calls to the boost.context (or some other coroutine library) constructors and yield methods from the IR, it could certainly have some issues, but i don't see any reason it wouldn't work