[LLVMdev] using external functions from llvm

[Alec Benzer]

The blog post I linked to implied that adding a symbol in the form
lle_X_FUNCTIONNAME would allow you to call a function called FUNCTIONNAME.
Is this not the case?

On Thu, Aug 19, 2010 at 6:46 PM, <o.j.sivart at gmail.com> wrote:

> You are adding the symbol as "lle_X_create_number_object" yet your error
> message implies you have tried to lookup and use "create_number_object". Can
> you provide the code for the lookup?
>
> On 20/08/2010, at 8:07 AM, Alec Benzer wrote:
>
> Is there documentation somewhere on how to call external functions from
> llvm? The only guide I found was this:
> http://www.gearleaf.com/blog/post/44, and it doesn't seem to be working
> for me.
>
> I have a function:
>
> llvm::GenericValue lle_X_create_number_object(llvm::FunctionType* ft, const
> std::vector<llvm::GenericValue>& args)
> {
>   llvm_object_structure* result = new llvm_object_structure;
>   result->typeIdx = TypeSystem::number;
>   result->data = reinterpret_cast<unsigned char*>(new
> double(args[0].DoubleVal));
>   llvm::GenericValue gv;
>   gv.PointerVal = reinterpret_cast<void*>(result);
>   return gv;
> }
>
> defined in an extern "C" block. I add it as a symbol with:
>
>
> llvm::sys::DynamicLibrary::AddSymbol("lle_X_create_number_object",(void*)lle_X_create_number_object);
>
> yet when attempting to call it I still get: "LLVM ERROR: Program used
> external function 'create_number_object' which could not be resolved!"
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>
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