[LLVMdev] Using a function from another module

[Michael Muller]

Michael Muller wrote:
> 
> Hi all,
> 
> I'm trying to use a function defined in one LLVM module from another module 
> (in the JIT) but for some reason it's not working out.  My sequence of 
> activity is roughly like this:
> 
>   1) Create moduleA
>   2) Create moduleB with "func()"
>   3) execEng = ExecutionEngine::create(
>          new ExistingModuleProvider(moduleB));
>   4) execute "func()" (this works fine)
>   4) add "func()" to moduleA as a declaration (no code blocks) with External
>      linkage.
>   5) execEng->addModuleProvider(new ExistingModuleProvider(moduleA));
>   6) run a function in moduleA that calls "func()"
> 
> I get:
>   LLVM ERROR: Program used external function 'func' which could not be resolved!
> 
> I'm guessing I'm either going about this wrong or missing something.  Can 
> anyone offer me some insight?

I've played around with this some more.

It looks like the only way that I can get this to work is to do an 
ExecutionEngine::addGlobalMapping() on the function declaration in moduleA to 
map it to the function pointer in moduleB.

This seems awkward, is there a better way to do this?

> 
> =============================================================================
> michaelMuller = mmuller at enduden.com | http://www.mindhog.net/~mmuller
> -----------------------------------------------------------------------------
> We are the music-makers, and we are the dreamers of dreams
>  - Arthur O'Shaughnessy
> =============================================================================
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> 


=============================================================================
michaelMuller = mmuller at enduden.com | http://www.mindhog.net/~mmuller
-----------------------------------------------------------------------------
you and I are only different in our minds, the universe makes no such
distinction
=============================================================================