[LLVMdev] How to const char* Value for function argument

[Dmitry N. Mikushin]

Hi,

I'm trying to replace function call with call to
wrapper(function_name, num_args, ...), where varargs hold args of
original call.

	Function* launch = Function::Create(
		TypeBuilder<int(const char*, int, ...), false>::get(context),
		GlobalValue::ExternalLinkage, "kernelgen_launch_", m2);

				{
					CallInst* call = dyn_cast<CallInst>(cast<Value>(I));
					if (!call) continue;
					Function* callee = call->getCalledFunction();
					if (!callee && !callee->isDeclaration()) continue;
					if (callee->getName() != func2.getName()) continue;

					SmallVector<Value*, 16> callargs(call->op_begin(), call->op_end());
					callargs.insert(callargs.begin(),
						ConstantInt::get(Type::getInt32Ty(context),
							call->getNumArgOperands()));
					callargs.insert(callargs.begin(), callee->getName());
					CallInst* newcall = CallInst::Create(launch, callargs, "", call);
					newcall->takeName(call);
					newcall->setCallingConv(call->getCallingConv());
					newcall->setAttributes(call->getAttributes());
					newcall->setDebugLoc(call->getDebugLoc());
					call->replaceAllUsesWith(newcall);
					
					found = true;
					break;
				}

The line callargs.insert(callargs.begin(), callee->getName()); is
invalid: instead of StringRef I need to supply a Value* for the second
argument. How to construct value for const char* ?

Thanks,
- D.