#include "llvm/Analysis/CFG.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/Passes/PassPlugin.h"
#include "llvm/Support/raw_ostream.h"

// only needed for printing
#include 

using namespace llvm;

namespace {

struct FirstModulePass : public PassInfoMixin {

  PreservedAnalyses run(Module &M, ModuleAnalysisManager &FAM) {
    // What we intend do do in the pass starts here.
    errs()