llvm dev - Jun 2007 - [LLVMdev] How to call native functions from bytecode run in JIT?

> Are you able make calls to well known external functions such as
> printf? As far as I known, this capability is well tested on x86 /
> Linux.
Calling printf works at least on OS X (I'm waiting for a reply  
whether this works on linux). If I call my native function it fails  
with PPCJITInfo.cpp:382: failed assertion `ResultPtr >= -(1 << 23)
&&
ResultPtr < (1 << 23) && "Relocation out of
range!"'
> I am wondering if there is some name mangling issue?
Not that I'm aware of. It appears to find the function using module- 
 >getFunction("get5")

Is there really nobody here who knows how to properly register native  
functions of the application to the execution engine?

Hi Jan,
> Calling printf works at least on OS X (I'm waiting for a reply
> whether this works on linux). If I call my native function it fails
> with PPCJITInfo.cpp:382: failed assertion `ResultPtr >= -(1 << 23)
&&
> ResultPtr < (1 << 23) && "Relocation out of
range!"'
I know nothing about this, but the failed assertion suggests the PPC
code generator can't cope with a constant that's bigger than expected at
that point.  Have you taken a look at PPCJITInfo.cpp:382?  It may shed
some light.

Cheers,


Ralph.

Hi,
> I know nothing about this, but the failed assertion suggests the PPC
> code generator can't cope with a constant that's bigger than  
> expected at
> that point.  Have you taken a look at PPCJITInfo.cpp:382?  It may shed
> some light.
It's inside PPCJITInfo::relocate but unfortunately I could not figure  
out anything from the source. It looks like it's calculating new  
addresses for functions which does not make much sense for a native  
function, at all

Greetings,
Jan