C++ GlobalVariable::getLinkage方法代码示例

static void
computeVariableSummary(ModuleSummaryIndex &Index, const GlobalVariable &V,
                       DenseSet<GlobalValue::GUID> &CantBePromoted) {
  SetVector<ValueInfo> RefEdges;
  SmallPtrSet<const User *, 8> Visited;
  findRefEdges(&V, RefEdges, Visited);
  bool NonRenamableLocal = isNonRenamableLocal(V);
  GlobalValueSummary::GVFlags Flags(V.getLinkage(), NonRenamableLocal,
                                    /* LiveRoot = */ false);
  auto GVarSummary =
      llvm::make_unique<GlobalVarSummary>(Flags, RefEdges.takeVector());
  if (NonRenamableLocal)
    CantBePromoted.insert(V.getGUID());
  Index.addGlobalValueSummary(V.getName(), std::move(GVarSummary));
}

GlobalVariable *
InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
  GlobalVariable *NamePtr = Inc->getName();
  auto It = ProfileDataMap.find(NamePtr);
  PerFunctionProfileData PD;
  if (It != ProfileDataMap.end()) {
    if (It->second.RegionCounters)
      return It->second.RegionCounters;
    PD = It->second;
  }

  // Move the name variable to the right section. Place them in a COMDAT group
  // if the associated function is a COMDAT. This will make sure that
  // only one copy of counters of the COMDAT function will be emitted after
  // linking.
  Function *Fn = Inc->getParent()->getParent();
  Comdat *ProfileVarsComdat = nullptr;
  ProfileVarsComdat = getOrCreateProfileComdat(*M, *Fn, Inc);

  uint64_t NumCounters = Inc->getNumCounters()->getZExtValue();
  LLVMContext &Ctx = M->getContext();
  ArrayType *CounterTy = ArrayType::get(Type::getInt64Ty(Ctx), NumCounters);

  // Create the counters variable.
  auto *CounterPtr =
      new GlobalVariable(*M, CounterTy, false, NamePtr->getLinkage(),
                         Constant::getNullValue(CounterTy),
                         getVarName(Inc, getInstrProfCountersVarPrefix()));
  CounterPtr->setVisibility(NamePtr->getVisibility());
  CounterPtr->setSection(
      getInstrProfSectionName(IPSK_cnts, TT.getObjectFormat()));
  CounterPtr->setAlignment(8);
  CounterPtr->setComdat(ProfileVarsComdat);

  auto *Int8PtrTy = Type::getInt8PtrTy(Ctx);
  // Allocate statically the array of pointers to value profile nodes for
  // the current function.
  Constant *ValuesPtrExpr = ConstantPointerNull::get(Int8PtrTy);
  if (ValueProfileStaticAlloc && !needsRuntimeRegistrationOfSectionRange(*M)) {
    uint64_t NS = 0;
    for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
      NS += PD.NumValueSites[Kind];
    if (NS) {
      ArrayType *ValuesTy = ArrayType::get(Type::getInt64Ty(Ctx), NS);

      auto *ValuesVar =
          new GlobalVariable(*M, ValuesTy, false, NamePtr->getLinkage(),
                             Constant::getNullValue(ValuesTy),
                             getVarName(Inc, getInstrProfValuesVarPrefix()));
      ValuesVar->setVisibility(NamePtr->getVisibility());
      ValuesVar->setSection(
          getInstrProfSectionName(IPSK_vals, TT.getObjectFormat()));
      ValuesVar->setAlignment(8);
      ValuesVar->setComdat(ProfileVarsComdat);
      ValuesPtrExpr =
          ConstantExpr::getBitCast(ValuesVar, Type::getInt8PtrTy(Ctx));
    }
  }

  // Create data variable.
  auto *Int16Ty = Type::getInt16Ty(Ctx);
  auto *Int16ArrayTy = ArrayType::get(Int16Ty, IPVK_Last + 1);
  Type *DataTypes[] = {
#define INSTR_PROF_DATA(Type, LLVMType, Name, Init) LLVMType,
#include "llvm/ProfileData/InstrProfData.inc"
  };
  auto *DataTy = StructType::get(Ctx, makeArrayRef(DataTypes));

  Constant *FunctionAddr = shouldRecordFunctionAddr(Fn)
                               ? ConstantExpr::getBitCast(Fn, Int8PtrTy)
                               : ConstantPointerNull::get(Int8PtrTy);

  Constant *Int16ArrayVals[IPVK_Last + 1];
  for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
    Int16ArrayVals[Kind] = ConstantInt::get(Int16Ty, PD.NumValueSites[Kind]);

  Constant *DataVals[] = {
#define INSTR_PROF_DATA(Type, LLVMType, Name, Init) Init,
#include "llvm/ProfileData/InstrProfData.inc"
  };
  auto *Data = new GlobalVariable(*M, DataTy, false, NamePtr->getLinkage(),
                                  ConstantStruct::get(DataTy, DataVals),
                                  getVarName(Inc, getInstrProfDataVarPrefix()));
  Data->setVisibility(NamePtr->getVisibility());
  Data->setSection(getInstrProfSectionName(IPSK_data, TT.getObjectFormat()));
  Data->setAlignment(INSTR_PROF_DATA_ALIGNMENT);
  Data->setComdat(ProfileVarsComdat);

  PD.RegionCounters = CounterPtr;
  PD.DataVar = Data;
  ProfileDataMap[NamePtr] = PD;

  // Mark the data variable as used so that it isn't stripped out.
  UsedVars.push_back(Data);
  // Now that the linkage set by the FE has been passed to the data and counter
  // variables, reset Name variable's linkage and visibility to private so that
  // it can be removed later by the compiler.
  NamePtr->setLinkage(GlobalValue::PrivateLinkage);
  // Collect the referenced names to be used by emitNameData.
  ReferencedNames.push_back(NamePtr);
//.........这里部分代码省略.........

GlobalVariable *
InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
  GlobalVariable *Name = Inc->getName();
  auto It = RegionCounters.find(Name);
  if (It != RegionCounters.end())
    return It->second;

  // Move the name variable to the right section. Place them in a COMDAT group
  // if the associated function is a COMDAT. This will make sure that
  // only one copy of counters of the COMDAT function will be emitted after
  // linking.
  Function *Fn = Inc->getParent()->getParent();
  Comdat *ProfileVarsComdat = nullptr;
  if (Fn->hasComdat())
    ProfileVarsComdat = M->getOrInsertComdat(StringRef(getVarName(Inc, "vars")));
  Name->setSection(getNameSection());
  Name->setAlignment(1);
  Name->setComdat(ProfileVarsComdat);

  uint64_t NumCounters = Inc->getNumCounters()->getZExtValue();
  LLVMContext &Ctx = M->getContext();
  ArrayType *CounterTy = ArrayType::get(Type::getInt64Ty(Ctx), NumCounters);

  // Create the counters variable.
  auto *Counters = new GlobalVariable(*M, CounterTy, false, Name->getLinkage(),
                                      Constant::getNullValue(CounterTy),
                                      getVarName(Inc, "counters"));
  Counters->setVisibility(Name->getVisibility());
  Counters->setSection(getCountersSection());
  Counters->setAlignment(8);
  Counters->setComdat(ProfileVarsComdat);

  RegionCounters[Inc->getName()] = Counters;

  // Create data variable.
  auto *NameArrayTy = Name->getType()->getPointerElementType();
  auto *Int32Ty = Type::getInt32Ty(Ctx);
  auto *Int64Ty = Type::getInt64Ty(Ctx);
  auto *Int8PtrTy = Type::getInt8PtrTy(Ctx);
  auto *Int64PtrTy = Type::getInt64PtrTy(Ctx);

  Type *DataTypes[] = {Int32Ty, Int32Ty, Int64Ty, Int8PtrTy, Int64PtrTy};
  auto *DataTy = StructType::get(Ctx, makeArrayRef(DataTypes));
  Constant *DataVals[] = {
      ConstantInt::get(Int32Ty, NameArrayTy->getArrayNumElements()),
      ConstantInt::get(Int32Ty, NumCounters),
      ConstantInt::get(Int64Ty, Inc->getHash()->getZExtValue()),
      ConstantExpr::getBitCast(Name, Int8PtrTy),
      ConstantExpr::getBitCast(Counters, Int64PtrTy)};
  auto *Data = new GlobalVariable(*M, DataTy, true, Name->getLinkage(),
                                  ConstantStruct::get(DataTy, DataVals),
                                  getVarName(Inc, "data"));
  Data->setVisibility(Name->getVisibility());
  Data->setSection(getDataSection());
  Data->setAlignment(8);
  Data->setComdat(ProfileVarsComdat);

  // Mark the data variable as used so that it isn't stripped out.
  UsedVars.push_back(Data);

  return Counters;
}

bool GenericToNVVM::runOnModule(Module &M) {
  // Create a clone of each global variable that has the default address space.
  // The clone is created with the global address space  specifier, and the pair
  // of original global variable and its clone is placed in the GVMap for later
  // use.

  for (Module::global_iterator I = M.global_begin(), E = M.global_end();
       I != E;) {
    GlobalVariable *GV = &*I++;
    if (GV->getType()->getAddressSpace() == llvm::ADDRESS_SPACE_GENERIC &&
        !llvm::isTexture(*GV) && !llvm::isSurface(*GV) &&
        !llvm::isSampler(*GV) && !GV->getName().startswith("llvm.")) {
      GlobalVariable *NewGV = new GlobalVariable(
          M, GV->getValueType(), GV->isConstant(),
          GV->getLinkage(),
          GV->hasInitializer() ? GV->getInitializer() : nullptr,
          "", GV, GV->getThreadLocalMode(), llvm::ADDRESS_SPACE_GLOBAL);
      NewGV->copyAttributesFrom(GV);
      GVMap[GV] = NewGV;
    }
  }

  // Return immediately, if every global variable has a specific address space
  // specifier.
  if (GVMap.empty()) {
    return false;
  }

  // Walk through the instructions in function defitinions, and replace any use
  // of original global variables in GVMap with a use of the corresponding
  // copies in GVMap.  If necessary, promote constants to instructions.
  for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
    if (I->isDeclaration()) {
      continue;
    }
    IRBuilder<> Builder(I->getEntryBlock().getFirstNonPHIOrDbg());
    for (Function::iterator BBI = I->begin(), BBE = I->end(); BBI != BBE;
         ++BBI) {
      for (BasicBlock::iterator II = BBI->begin(), IE = BBI->end(); II != IE;
           ++II) {
        for (unsigned i = 0, e = II->getNumOperands(); i < e; ++i) {
          Value *Operand = II->getOperand(i);
          if (isa<Constant>(Operand)) {
            II->setOperand(
                i, remapConstant(&M, &*I, cast<Constant>(Operand), Builder));
          }
        }
      }
    }
    ConstantToValueMap.clear();
  }

  // Copy GVMap over to a standard value map.
  ValueToValueMapTy VM;
  for (auto I = GVMap.begin(), E = GVMap.end(); I != E; ++I)
    VM[I->first] = I->second;

  // Walk through the metadata section and update the debug information
  // associated with the global variables in the default address space.
  for (NamedMDNode &I : M.named_metadata()) {
    remapNamedMDNode(VM, &I);
  }

  // Walk through the global variable  initializers, and replace any use of
  // original global variables in GVMap with a use of the corresponding copies
  // in GVMap.  The copies need to be bitcast to the original global variable
  // types, as we cannot use cvta in global variable initializers.
  for (GVMapTy::iterator I = GVMap.begin(), E = GVMap.end(); I != E;) {
    GlobalVariable *GV = I->first;
    GlobalVariable *NewGV = I->second;

    // Remove GV from the map so that it can be RAUWed.  Note that
    // DenseMap::erase() won't invalidate any iterators but this one.
    auto Next = std::next(I);
    GVMap.erase(I);
    I = Next;

    Constant *BitCastNewGV = ConstantExpr::getPointerCast(NewGV, GV->getType());
    // At this point, the remaining uses of GV should be found only in global
    // variable initializers, as other uses have been already been removed
    // while walking through the instructions in function definitions.
    GV->replaceAllUsesWith(BitCastNewGV);
    std::string Name = GV->getName();
    GV->eraseFromParent();
    NewGV->setName(Name);
  }
  assert(GVMap.empty() && "Expected it to be empty by now");

  return true;
}

// This function replaces all global variables with new variables that have
// trailing redzones. It also creates a function that poisons
// redzones and inserts this function into llvm.global_ctors.
bool AddressSanitizer::insertGlobalRedzones(Module &M) {
  SmallVector<GlobalVariable *, 16> GlobalsToChange;

  for (Module::GlobalListType::iterator G = M.global_begin(),
       E = M.global_end(); G != E; ++G) {
    if (ShouldInstrumentGlobal(G))
      GlobalsToChange.push_back(G);
  }

  size_t n = GlobalsToChange.size();
  if (n == 0) return false;

  // A global is described by a structure
  //   size_t beg;
  //   size_t size;
  //   size_t size_with_redzone;
  //   const char *name;
  //   size_t has_dynamic_init;
  // We initialize an array of such structures and pass it to a run-time call.
  StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy,
                                               IntptrTy, IntptrTy,
                                               IntptrTy, NULL);
  SmallVector<Constant *, 16> Initializers(n), DynamicInit;

  IRBuilder<> IRB(CtorInsertBefore);

  if (ClInitializers)
    FindDynamicInitializers(M);

  // The addresses of the first and last dynamically initialized globals in
  // this TU.  Used in initialization order checking.
  Value *FirstDynamic = 0, *LastDynamic = 0;

  for (size_t i = 0; i < n; i++) {
    GlobalVariable *G = GlobalsToChange[i];
    PointerType *PtrTy = cast<PointerType>(G->getType());
    Type *Ty = PtrTy->getElementType();
    uint64_t SizeInBytes = TD->getTypeAllocSize(Ty);
    uint64_t RightRedzoneSize = RedzoneSize +
        (RedzoneSize - (SizeInBytes % RedzoneSize));
    Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize);
    // Determine whether this global should be poisoned in initialization.
    bool GlobalHasDynamicInitializer = HasDynamicInitializer(G);
    // Don't check initialization order if this global is blacklisted.
    GlobalHasDynamicInitializer &= !BL->isInInit(*G);

    StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL);
    Constant *NewInitializer = ConstantStruct::get(
        NewTy, G->getInitializer(),
        Constant::getNullValue(RightRedZoneTy), NULL);

    SmallString<2048> DescriptionOfGlobal = G->getName();
    DescriptionOfGlobal += " (";
    DescriptionOfGlobal += M.getModuleIdentifier();
    DescriptionOfGlobal += ")";
    GlobalVariable *Name = createPrivateGlobalForString(M, DescriptionOfGlobal);

    // Create a new global variable with enough space for a redzone.
    GlobalVariable *NewGlobal = new GlobalVariable(
        M, NewTy, G->isConstant(), G->getLinkage(),
        NewInitializer, "", G, G->getThreadLocalMode());
    NewGlobal->copyAttributesFrom(G);
    NewGlobal->setAlignment(RedzoneSize);

    Value *Indices2[2];
    Indices2[0] = IRB.getInt32(0);
    Indices2[1] = IRB.getInt32(0);

    G->replaceAllUsesWith(
        ConstantExpr::getGetElementPtr(NewGlobal, Indices2, true));
    NewGlobal->takeName(G);
    G->eraseFromParent();

    Initializers[i] = ConstantStruct::get(
        GlobalStructTy,
        ConstantExpr::getPointerCast(NewGlobal, IntptrTy),
        ConstantInt::get(IntptrTy, SizeInBytes),
        ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize),
        ConstantExpr::getPointerCast(Name, IntptrTy),
        ConstantInt::get(IntptrTy, GlobalHasDynamicInitializer),
        NULL);

    // Populate the first and last globals declared in this TU.
    if (ClInitializers && GlobalHasDynamicInitializer) {
      LastDynamic = ConstantExpr::getPointerCast(NewGlobal, IntptrTy);
      if (FirstDynamic == 0)
        FirstDynamic = LastDynamic;
    }

    DEBUG(dbgs() << "NEW GLOBAL:\n" << *NewGlobal);
  }

  ArrayType *ArrayOfGlobalStructTy = ArrayType::get(GlobalStructTy, n);
  GlobalVariable *AllGlobals = new GlobalVariable(
      M, ArrayOfGlobalStructTy, false, GlobalVariable::PrivateLinkage,
      ConstantArray::get(ArrayOfGlobalStructTy, Initializers), "");

//.........这里部分代码省略.........

// This function replaces all global variables with new variables that have
// trailing redzones. It also creates a function that poisons
// redzones and inserts this function into llvm.global_ctors.
bool AddressSanitizer::insertGlobalRedzones(Module &M) {
  SmallVector<GlobalVariable *, 16> GlobalsToChange;

  for (Module::GlobalListType::iterator G = M.getGlobalList().begin(),
       E = M.getGlobalList().end(); G != E; ++G) {
    Type *Ty = cast<PointerType>(G->getType())->getElementType();
    DEBUG(dbgs() << "GLOBAL: " << *G);

    if (!Ty->isSized()) continue;
    if (!G->hasInitializer()) continue;
    // Touch only those globals that will not be defined in other modules.
    // Don't handle ODR type linkages since other modules may be built w/o asan.
    if (G->getLinkage() != GlobalVariable::ExternalLinkage &&
        G->getLinkage() != GlobalVariable::PrivateLinkage &&
        G->getLinkage() != GlobalVariable::InternalLinkage)
      continue;
    // Two problems with thread-locals:
    //   - The address of the main thread's copy can't be computed at link-time.
    //   - Need to poison all copies, not just the main thread's one.
    if (G->isThreadLocal())
      continue;
    // For now, just ignore this Alloca if the alignment is large.
    if (G->getAlignment() > RedzoneSize) continue;

    // Ignore all the globals with the names starting with "\01L_OBJC_".
    // Many of those are put into the .cstring section. The linker compresses
    // that section by removing the spare \0s after the string terminator, so
    // our redzones get broken.
    if ((G->getName().find("\01L_OBJC_") == 0) ||
        (G->getName().find("\01l_OBJC_") == 0)) {
      DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G);
      continue;
    }

    if (G->hasSection()) {
      StringRef Section(G->getSection());
      // Ignore the globals from the __OBJC section. The ObjC runtime assumes
      // those conform to /usr/lib/objc/runtime.h, so we can't add redzones to
      // them.
      if ((Section.find("__OBJC,") == 0) ||
          (Section.find("__DATA, __objc_") == 0)) {
        DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G);
        continue;
      }
      // See http://code.google.com/p/address-sanitizer/issues/detail?id=32
      // Constant CFString instances are compiled in the following way:
      //  -- the string buffer is emitted into
      //     __TEXT,__cstring,cstring_literals
      //  -- the constant NSConstantString structure referencing that buffer
      //     is placed into __DATA,__cfstring
      // Therefore there's no point in placing redzones into __DATA,__cfstring.
      // Moreover, it causes the linker to crash on OS X 10.7
      if (Section.find("__DATA,__cfstring") == 0) {
        DEBUG(dbgs() << "Ignoring CFString: " << *G);
        continue;
      }
    }

    GlobalsToChange.push_back(G);
  }

  size_t n = GlobalsToChange.size();
  if (n == 0) return false;

  // A global is described by a structure
  //   size_t beg;
  //   size_t size;
  //   size_t size_with_redzone;
  //   const char *name;
  // We initialize an array of such structures and pass it to a run-time call.
  StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy,
                                               IntptrTy, IntptrTy, NULL);
  SmallVector<Constant *, 16> Initializers(n);

  IRBuilder<> IRB(CtorInsertBefore);

  for (size_t i = 0; i < n; i++) {
    GlobalVariable *G = GlobalsToChange[i];
    PointerType *PtrTy = cast<PointerType>(G->getType());
    Type *Ty = PtrTy->getElementType();
    uint64_t SizeInBytes = TD->getTypeStoreSizeInBits(Ty) / 8;
    uint64_t RightRedzoneSize = RedzoneSize +
        (RedzoneSize - (SizeInBytes % RedzoneSize));
    Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize);

    StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL);
    Constant *NewInitializer = ConstantStruct::get(
        NewTy, G->getInitializer(),
        Constant::getNullValue(RightRedZoneTy), NULL);

    SmallString<2048> DescriptionOfGlobal = G->getName();
    DescriptionOfGlobal += " (";
    DescriptionOfGlobal += M.getModuleIdentifier();
    DescriptionOfGlobal += ")";
    GlobalVariable *Name = createPrivateGlobalForString(M, DescriptionOfGlobal);

    // Create a new global variable with enough space for a redzone.
//.........这里部分代码省略.........

GlobalVariable *
InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
  GlobalVariable *NamePtr = Inc->getName();
  auto It = ProfileDataMap.find(NamePtr);
  PerFunctionProfileData PD;
  if (It != ProfileDataMap.end()) {
    if (It->second.RegionCounters)
      return It->second.RegionCounters;
    PD = It->second;
  }

  // Move the name variable to the right section. Place them in a COMDAT group
  // if the associated function is a COMDAT. This will make sure that
  // only one copy of counters of the COMDAT function will be emitted after
  // linking.
  Function *Fn = Inc->getParent()->getParent();
  Comdat *ProfileVarsComdat = nullptr;
  if (Fn->hasComdat())
    ProfileVarsComdat = getOrCreateProfileComdat(*M, Inc);
  NamePtr->setSection(getNameSection());
  NamePtr->setAlignment(1);
  NamePtr->setComdat(ProfileVarsComdat);

  uint64_t NumCounters = Inc->getNumCounters()->getZExtValue();
  LLVMContext &Ctx = M->getContext();
  ArrayType *CounterTy = ArrayType::get(Type::getInt64Ty(Ctx), NumCounters);

  // Create the counters variable.
  auto *CounterPtr =
      new GlobalVariable(*M, CounterTy, false, NamePtr->getLinkage(),
                         Constant::getNullValue(CounterTy),
                         getVarName(Inc, getInstrProfCountersVarPrefix()));
  CounterPtr->setVisibility(NamePtr->getVisibility());
  CounterPtr->setSection(getCountersSection());
  CounterPtr->setAlignment(8);
  CounterPtr->setComdat(ProfileVarsComdat);

  // Create data variable.
  auto *Int8PtrTy = Type::getInt8PtrTy(Ctx);
  auto *Int16Ty = Type::getInt16Ty(Ctx);
  auto *Int16ArrayTy = ArrayType::get(Int16Ty, IPVK_Last+1);
  Type *DataTypes[] = {
    #define INSTR_PROF_DATA(Type, LLVMType, Name, Init) LLVMType,
    #include "llvm/ProfileData/InstrProfData.inc"
  };
  auto *DataTy = StructType::get(Ctx, makeArrayRef(DataTypes));

  Constant *FunctionAddr = shouldRecordFunctionAddr(Fn) ?
                           ConstantExpr::getBitCast(Fn, Int8PtrTy) :
                           ConstantPointerNull::get(Int8PtrTy);

  Constant *Int16ArrayVals[IPVK_Last+1];
  for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
    Int16ArrayVals[Kind] = ConstantInt::get(Int16Ty, PD.NumValueSites[Kind]);

  Constant *DataVals[] = {
    #define INSTR_PROF_DATA(Type, LLVMType, Name, Init) Init,
    #include "llvm/ProfileData/InstrProfData.inc"
  };
  auto *Data = new GlobalVariable(*M, DataTy, false, NamePtr->getLinkage(),
                                  ConstantStruct::get(DataTy, DataVals),
                                  getVarName(Inc, getInstrProfDataVarPrefix()));
  Data->setVisibility(NamePtr->getVisibility());
  Data->setSection(getDataSection());
  Data->setAlignment(INSTR_PROF_DATA_ALIGNMENT);
  Data->setComdat(ProfileVarsComdat);

  PD.RegionCounters = CounterPtr;
  PD.DataVar = Data;
  ProfileDataMap[NamePtr] = PD;

  // Mark the data variable as used so that it isn't stripped out.
  UsedVars.push_back(Data);

  return CounterPtr;
}

  bool runOnFunction(Function &F) override
  {
    if (F.hasFnAttribute("emit_llvm")) {
      Module *M = F.getParent();

      static Regex R("4func.*$");
      GlobalVariable *GV = M->getGlobalVariable(R.sub("2irE", F.getName()), true);
      if (GV != NULL) {
        string S;
        raw_string_ostream SO(S);
        F.print(SO);

        Constant *CDA = ConstantDataArray::getString(M->getContext(), SO.str());
        GV->setInitializer(ConstantExpr::getBitCast(new GlobalVariable(*M, CDA->getType(), true, GV->getLinkage(), CDA),
                                                    Type::getInt8PtrTy(M->getContext())));

        return true;
      }
    }

    return false;
  }