Error in adding TargetData in PassManager in llvm - llvm

Question

I am beginner to llvm. I am implementing a program main.cpp of https://github.com/davidar/lljvm/blob/master/backend/main.cpp . When I am declaring a PassManager PM
PM.add(new DataLayout td), it throws a error :
error: missing template arguments before ‘PM’
PassManager PM;
As keeping above error in mind I change the command as
PassManger<Module> PM
PM.add(new DataLayout td)
Now, there is different error : error: ‘class llvm::PassManager<llvm::Module>’ has no member named ‘add’ I dont know whether the above changes is correct way or not?
Here is a source code:
#include "backened.h"
#include <iostream>
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/IR/PassManager.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/DataLayout.h"
#include <llvm/Transforms/Scalar.h>
#include "llvm/IR/LegacyPassManager.h"
using namespace llvm;
using namespace std;
static cl::opt<string> input(cl::Positional, cl::desc("Bitcode File.."),cl::Required);
static cl::opt<string> classname("classname",cl::desc("Binary name of the generated class..."));
int main(int argc, char** argv)
{
cl::ParseCommandLineOptions(argc, argv, "LLVM Bitcode ..");
LLVMContext context;
ErrorOr<unique_ptr<MemoryBuffer>> mb = MemoryBuffer::getFile(input);
if(error_code ec = mb.getError())
{
errs() << ec.message();
return 1;
}
Expected<unique_ptr<Module>> m = parseBitcodeFile(mb->get()->getMemBufferRef(),context);
if(error_code ec= errorToErrorCode(m.takeError()) )
{
PassManager<Module> PM;
DataLayout td("e-p:32:32:32"
"-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64"
"-f32:32:32-f64:64:64");
PM.add(new DataLayout(td));
return 0;
}
Also, suggest me whether I have implemented a correct way the DataLayout td inplace of TargetData td as I found TargetData.h is removed from newer version of llvm.

Answer 1

The PassManager used in that example has moved into the legacy namespace,
so use #include "llvm/IR/LegacyPassManager.h"
Change the variable declaration to legacy::PassManager PM;