[LLVMdev] lli on ARM simulator

[Jim Grosbach]

On May 3, 2009, at 7:25 AM, Geoffrey Tochukwu Ndu wrote:
>
> I am currently looking at LLVM's JIT and would like to build an lli  
> tool
> for an ARM simulator such as simple scalar. I would be grateful if  
> someone
> could point me in the right direction.

To run lli, you can build LLVM as a canadian cross compiler (i.e.,  
such that the built tools run on a different architecture than the  
build machine). To do so, use the appropriate triples for the --build  
and --host configure options suited to your environment. Note that  
this assumes that you'll have an OS running on the simulated target  
suitable for launching a command line application like lli. If you  
have an arm-linux port for your target, you should be most of the way  
there (if not completely). If your environment is different, such as a  
custom OS of some sort, you'll have a bit more work to do, as you'll  
need to teach LLVM how to build for your target runtime in order to  
bootstrap up to having lli, and the LLVM libraries that the JIT uses,  
available.

I would suggest having a look at the build infrastructure for LLVM and  
how the libraries are built then linked in to the lli application.  
That should give you an overview of which pieces you'll need to bring  
in for whatever custom JIT runtime you have in mind.

Regards,
   Jim