[LLVMdev] Using argument in another module

[David Blaikie]

On Tue, Dec 25, 2012 at 9:15 PM, ChiaLun <h3355626 at msn.com> wrote:
>
> Hi everyone,
>
>   I am building a function that would call a function in another module,
>
> I found this related thread
>
> http://llvm.1065342.n5.nabble.com/Using-a-function-from-another-module-td10506.html
>
> All my functions have prototype
>
> int f(myStruct * c);
>
> here comes my problems
>
> If I have Function* f1,*f2
>
> f2 is in another module, f1 is the function I am building.
>
> Somewhere in f1 , I set
>
> builder.CreateCall(f2,f1->arg_begin());                // builder is
> IRBuilder, its context is the same as f1
>
>
> When I run my program, I get
>
> llvm/lib/VMCore/Instructions.cpp:274: void
> llvm::CallInst::init(llvm::Value*, llvm::ArrayRef<llvm::Value*>, const
> llvm::Twine&): Assertion `(i >= FTy->getNumParams() || FTy->getParamType(i)
> == Args[i]->getType()) && "Calling a function with a bad signature!"'
> failed.
>
>
> I found another thread having the same problem
>
> http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-July/052083.html
>
> It says that the problem results from parameter in different context.
>
> In that thread, it's still unsolved.
>
>
> The reason I have this problem is that I am using many threads to create and
> build LLVM functions, each thread
>
> has its own LLVMContext, and they may execute functions built by other
> threads.

(caveat: I'm not a specialist in LLVM issues, I work mostly with Clang)

I'm confused - are you using Functions built with one LLVMContext in
another LLVMContext? I'm pretty sure that would be invalid. You'd have
to create an external declaration of the function in any LLVMContext
you want to use it in I would think.

You shouldn't ever be mixing things between LLVMContexts.

- David

>
>
> Does anyone have idea on how to solve that ?
>
>
> Have A Nice Day
>
> Chia Lun Liu
>
>
>
>
> --
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