[LLVMdev] How to const char* Value for function argument (original) (raw)

Dmitry N. Mikushin maemarcus at gmail.com
Thu Sep 22 03:22:45 PDT 2011

Thank you, James!

2011/9/22 James Molloy <James.Molloy at arm.com>:

Hi Dimitry,

This makes sense if you think about it from the perspective that the string you want passing must be passed at runtime, and so can't use a const char * from compile time. You need to make the string visible in the compiled image, and use that as the argument. A string is an array of 8-bit integers, so you need to create a ConstantArray. Value *v = ConstantArray::get(Context, callee->getName(), /AddNull=/true); Cheers, James -----Original Message----- From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Dmitry N. Mikushin Sent: 22 September 2011 11:06 To: LLVM-Dev Subject: [LLVMdev] How to const char* Value for function argument Hi, I'm trying to replace function call with call to wrapper(functionname, numargs, ...), where varargs hold args of original call.  Function* launch = Function::Create(  TypeBuilder<int(const char*, int, ...), false>::get(context),  GlobalValue::ExternalLinkage, "kernelgenlaunch", m2);  {  CallInst* call = dyncast(cast(I));  if (!call) continue;  Function* callee = call->getCalledFunction();  if (!callee && !callee->isDeclaration()) continue;  if (callee->getName() != func2.getName()) continue;  SmallVector<Value*, 16> callargs(call->opbegin(), call->opend());  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.

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