llvm dev - Apr 2018 - Call printf with new args

Hello,

My code: (CallInst *CI, IRBuilder<> &B)

    SmallVector<Value *, 8> args;
    Value *v = B.CreateGlobalString("hi", "str");
    args.push_back(v);

    SmallVector<Type*, 8> params;
    params.push_back(v->getType());

    Module *M = B.GetInsertBlock()->getParent()->getParent();


    FunctionType *printfType = FunctionType::get(B.getInt32Ty(), params,
true);
    Constant* const_printf = M->getOrInsertFunction("printf",
printfType);
    Function *F = cast<Function>(const_printf);
    F->dump();
    CallInst * opInst = B.CreateCall(F, args, "call");


It crashes with:
void llvm::CallInst::init(llvm::FunctionType*, llvm::Value*,
llvm::ArrayRef<llvm::Value*>,
llvm::ArrayRef<llvm::OperandBundleDefT<llvm::Value*> >, const
llvm::Twine&): Assertion `(i >= FTy->getNumParams() ||
FTy->getParamType(i)
== Args[i]->getType()) && "Calling a function with a bad
signature!"'
failed.

Any advices how to fix it? Thanks
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On 4/4/2018 12:38 PM, Dávid Bolvanský via llvm-dev
wrote:
> Hello,
>
> My code: (CallInst *CI, IRBuilder<> &B)
>
>     SmallVector<Value *, 8> args;
>     Value *v = B.CreateGlobalString("hi", "str");
>     args.push_back(v);
>     SmallVector<Type*, 8> params;
>     params.push_back(v->getType());
>
>     Module *M = B.GetInsertBlock()->getParent()->getParent();
>
>
>     FunctionType *printfType = FunctionType::get(B.getInt32Ty(), 
> params, true);
This should be "FunctionType::get(B.getInt32Ty(), B.getInt8PtrTy(),
true)".

-Eli

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