Remove LLVM 8.0.1 files.

1 files changed, 0 insertions, 2033 deletions

diff --git a/gnu/llvm/lib/IR/LegacyPassManager.cpp b/gnu/llvm/lib/IR/LegacyPassManager.cpp
deleted file mode 100644
index 01d14f17bba..00000000000
--- a/gnu/llvm/lib/IR/LegacyPassManager.cpp
+++ /dev/null
@@ -1,2033 +0,0 @@
-//===- LegacyPassManager.cpp - LLVM Pass Infrastructure Implementation ----===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements the legacy LLVM Pass Manager infrastructure.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/IR/LegacyPassManager.h"
-#include "llvm/ADT/MapVector.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/IR/DiagnosticInfo.h"
-#include "llvm/IR/IRPrintingPasses.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/LegacyPassManagers.h"
-#include "llvm/IR/LegacyPassNameParser.h"
-#include "llvm/IR/Module.h"
-#include "llvm/IR/PassTimingInfo.h"
-#include "llvm/Support/Chrono.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/Error.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/ManagedStatic.h"
-#include "llvm/Support/Mutex.h"
-#include "llvm/Support/Timer.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-#include <unordered_set>
-using namespace llvm;
-using namespace llvm::legacy;
-
-// See PassManagers.h for Pass Manager infrastructure overview.
-
-//===----------------------------------------------------------------------===//
-// Pass debugging information.  Often it is useful to find out what pass is
-// running when a crash occurs in a utility.  When this library is compiled with
-// debugging on, a command line option (--debug-pass) is enabled that causes the
-// pass name to be printed before it executes.
-//
-
-namespace {
-// Different debug levels that can be enabled...
-enum PassDebugLevel {
-  Disabled, Arguments, Structure, Executions, Details
-};
-}
-
-static cl::opt<enum PassDebugLevel>
-PassDebugging("debug-pass", cl::Hidden,
-                  cl::desc("Print PassManager debugging information"),
-                  cl::values(
-  clEnumVal(Disabled  , "disable debug output"),
-  clEnumVal(Arguments , "print pass arguments to pass to 'opt'"),
-  clEnumVal(Structure , "print pass structure before run()"),
-  clEnumVal(Executions, "print pass name before it is executed"),
-  clEnumVal(Details   , "print pass details when it is executed")));
-
-namespace {
-typedef llvm::cl::list<const llvm::PassInfo *, bool, PassNameParser>
-PassOptionList;
-}
-
-// Print IR out before/after specified passes.
-static PassOptionList
-PrintBefore("print-before",
-            llvm::cl::desc("Print IR before specified passes"),
-            cl::Hidden);
-
-static PassOptionList
-PrintAfter("print-after",
-           llvm::cl::desc("Print IR after specified passes"),
-           cl::Hidden);
-
-static cl::opt<bool> PrintBeforeAll("print-before-all",
-                                    llvm::cl::desc("Print IR before each pass"),
-                                    cl::init(false), cl::Hidden);
-static cl::opt<bool> PrintAfterAll("print-after-all",
-                                   llvm::cl::desc("Print IR after each pass"),
-                                   cl::init(false), cl::Hidden);
-
-static cl::opt<bool>
-    PrintModuleScope("print-module-scope",
-                     cl::desc("When printing IR for print-[before|after]{-all} "
-                              "always print a module IR"),
-                     cl::init(false), cl::Hidden);
-
-static cl::list<std::string>
-    PrintFuncsList("filter-print-funcs", cl::value_desc("function names"),
-                   cl::desc("Only print IR for functions whose name "
-                            "match this for all print-[before|after][-all] "
-                            "options"),
-                   cl::CommaSeparated, cl::Hidden);
-
-/// This is a helper to determine whether to print IR before or
-/// after a pass.
-
-bool llvm::shouldPrintBeforePass() {
-  return PrintBeforeAll || !PrintBefore.empty();
-}
-
-bool llvm::shouldPrintAfterPass() {
-  return PrintAfterAll || !PrintAfter.empty();
-}
-
-static bool ShouldPrintBeforeOrAfterPass(StringRef PassID,
-                                         PassOptionList &PassesToPrint) {
-  for (auto *PassInf : PassesToPrint) {
-    if (PassInf)
-      if (PassInf->getPassArgument() == PassID) {
-        return true;
-      }
-  }
-  return false;
-}
-
-bool llvm::shouldPrintBeforePass(StringRef PassID) {
-  return PrintBeforeAll || ShouldPrintBeforeOrAfterPass(PassID, PrintBefore);
-}
-
-bool llvm::shouldPrintAfterPass(StringRef PassID) {
-  return PrintAfterAll || ShouldPrintBeforeOrAfterPass(PassID, PrintAfter);
-}
-
-bool llvm::forcePrintModuleIR() { return PrintModuleScope; }
-
-bool llvm::isFunctionInPrintList(StringRef FunctionName) {
-  static std::unordered_set<std::string> PrintFuncNames(PrintFuncsList.begin(),
-                                                        PrintFuncsList.end());
-  return PrintFuncNames.empty() || PrintFuncNames.count(FunctionName);
-}
-/// isPassDebuggingExecutionsOrMore - Return true if -debug-pass=Executions
-/// or higher is specified.
-bool PMDataManager::isPassDebuggingExecutionsOrMore() const {
-  return PassDebugging >= Executions;
-}
-
-unsigned PMDataManager::initSizeRemarkInfo(
-    Module &M, StringMap<std::pair<unsigned, unsigned>> &FunctionToInstrCount) {
-  // Only calculate getInstructionCount if the size-info remark is requested.
-  unsigned InstrCount = 0;
-
-  // Collect instruction counts for every function. We'll use this to emit
-  // per-function size remarks later.
-  for (Function &F : M) {
-    unsigned FCount = F.getInstructionCount();
-
-    // Insert a record into FunctionToInstrCount keeping track of the current
-    // size of the function as the first member of a pair. Set the second
-    // member to 0; if the function is deleted by the pass, then when we get
-    // here, we'll be able to let the user know that F no longer contributes to
-    // the module.
-    FunctionToInstrCount[F.getName().str()] =
-        std::pair<unsigned, unsigned>(FCount, 0);
-    InstrCount += FCount;
-  }
-  return InstrCount;
-}
-
-void PMDataManager::emitInstrCountChangedRemark(
-    Pass *P, Module &M, int64_t Delta, unsigned CountBefore,
-    StringMap<std::pair<unsigned, unsigned>> &FunctionToInstrCount,
-    Function *F) {
-  // If it's a pass manager, don't emit a remark. (This hinges on the assumption
-  // that the only passes that return non-null with getAsPMDataManager are pass
-  // managers.) The reason we have to do this is to avoid emitting remarks for
-  // CGSCC passes.
-  if (P->getAsPMDataManager())
-    return;
-
-  // Set to true if this isn't a module pass or CGSCC pass.
-  bool CouldOnlyImpactOneFunction = (F != nullptr);
-
-  // Helper lambda that updates the changes to the size of some function.
-  auto UpdateFunctionChanges =
-      [&FunctionToInstrCount](Function &MaybeChangedFn) {
-        // Update the total module count.
-        unsigned FnSize = MaybeChangedFn.getInstructionCount();
-        auto It = FunctionToInstrCount.find(MaybeChangedFn.getName());
-
-        // If we created a new function, then we need to add it to the map and
-        // say that it changed from 0 instructions to FnSize.
-        if (It == FunctionToInstrCount.end()) {
-          FunctionToInstrCount[MaybeChangedFn.getName()] =
-              std::pair<unsigned, unsigned>(0, FnSize);
-          return;
-        }
-        // Insert the new function size into the second member of the pair. This
-        // tells us whether or not this function changed in size.
-        It->second.second = FnSize;
-      };
-
-  // We need to initially update all of the function sizes.
-  // If no function was passed in, then we're either a module pass or an
-  // CGSCC pass.
-  if (!CouldOnlyImpactOneFunction)
-    std::for_each(M.begin(), M.end(), UpdateFunctionChanges);
-  else
-    UpdateFunctionChanges(*F);
-
-  // Do we have a function we can use to emit a remark?
-  if (!CouldOnlyImpactOneFunction) {
-    // We need a function containing at least one basic block in order to output
-    // remarks. Since it's possible that the first function in the module
-    // doesn't actually contain a basic block, we have to go and find one that's
-    // suitable for emitting remarks.
-    auto It = std::find_if(M.begin(), M.end(),
-                          [](const Function &Fn) { return !Fn.empty(); });
-
-    // Didn't find a function. Quit.
-    if (It == M.end())
-      return;
-
-    // We found a function containing at least one basic block.
-    F = &*It;
-  }
-  int64_t CountAfter = static_cast<int64_t>(CountBefore) + Delta;
-  BasicBlock &BB = *F->begin();
-  OptimizationRemarkAnalysis R("size-info", "IRSizeChange",
-                               DiagnosticLocation(), &BB);
-  // FIXME: Move ore namespace to DiagnosticInfo so that we can use it. This
-  // would let us use NV instead of DiagnosticInfoOptimizationBase::Argument.
-  R << DiagnosticInfoOptimizationBase::Argument("Pass", P->getPassName())
-    << ": IR instruction count changed from "
-    << DiagnosticInfoOptimizationBase::Argument("IRInstrsBefore", CountBefore)
-    << " to "
-    << DiagnosticInfoOptimizationBase::Argument("IRInstrsAfter", CountAfter)
-    << "; Delta: "
-    << DiagnosticInfoOptimizationBase::Argument("DeltaInstrCount", Delta);
-  F->getContext().diagnose(R); // Not using ORE for layering reasons.
-
-  // Emit per-function size change remarks separately.
-  std::string PassName = P->getPassName().str();
-
-  // Helper lambda that emits a remark when the size of a function has changed.
-  auto EmitFunctionSizeChangedRemark = [&FunctionToInstrCount, &F, &BB,
-                                        &PassName](const std::string &Fname) {
-    unsigned FnCountBefore, FnCountAfter;
-    std::pair<unsigned, unsigned> &Change = FunctionToInstrCount[Fname];
-    std::tie(FnCountBefore, FnCountAfter) = Change;
-    int64_t FnDelta = static_cast<int64_t>(FnCountAfter) -
-                      static_cast<int64_t>(FnCountBefore);
-
-    if (FnDelta == 0)
-      return;
-
-    // FIXME: We shouldn't use BB for the location here. Unfortunately, because
-    // the function that we're looking at could have been deleted, we can't use
-    // it for the source location. We *want* remarks when a function is deleted
-    // though, so we're kind of stuck here as is. (This remark, along with the
-    // whole-module size change remarks really ought not to have source
-    // locations at all.)
-    OptimizationRemarkAnalysis FR("size-info", "FunctionIRSizeChange",
-                                  DiagnosticLocation(), &BB);
-    FR << DiagnosticInfoOptimizationBase::Argument("Pass", PassName)
-       << ": Function: "
-       << DiagnosticInfoOptimizationBase::Argument("Function", Fname)
-       << ": IR instruction count changed from "
-       << DiagnosticInfoOptimizationBase::Argument("IRInstrsBefore",
-                                                   FnCountBefore)
-       << " to "
-       << DiagnosticInfoOptimizationBase::Argument("IRInstrsAfter",
-                                                   FnCountAfter)
-       << "; Delta: "
-       << DiagnosticInfoOptimizationBase::Argument("DeltaInstrCount", FnDelta);
-    F->getContext().diagnose(FR);
-
-    // Update the function size.
-    Change.first = FnCountAfter;
-  };
-
-  // Are we looking at more than one function? If so, emit remarks for all of
-  // the functions in the module. Otherwise, only emit one remark.
-  if (!CouldOnlyImpactOneFunction)
-    std::for_each(FunctionToInstrCount.keys().begin(),
-                  FunctionToInstrCount.keys().end(),
-                  EmitFunctionSizeChangedRemark);
-  else
-    EmitFunctionSizeChangedRemark(F->getName().str());
-}
-
-void PassManagerPrettyStackEntry::print(raw_ostream &OS) const {
-  if (!V && !M)
-    OS << "Releasing pass '";
-  else
-    OS << "Running pass '";
-
-  OS << P->getPassName() << "'";
-
-  if (M) {
-    OS << " on module '" << M->getModuleIdentifier() << "'.\n";
-    return;
-  }
-  if (!V) {
-    OS << '\n';
-    return;
-  }
-
-  OS << " on ";
-  if (isa<Function>(V))
-    OS << "function";
-  else if (isa<BasicBlock>(V))
-    OS << "basic block";
-  else
-    OS << "value";
-
-  OS << " '";
-  V->printAsOperand(OS, /*PrintTy=*/false, M);
-  OS << "'\n";
-}
-
-
-namespace {
-//===----------------------------------------------------------------------===//
-// BBPassManager
-//
-/// BBPassManager manages BasicBlockPass. It batches all the
-/// pass together and sequence them to process one basic block before
-/// processing next basic block.
-class BBPassManager : public PMDataManager, public FunctionPass {
-
-public:
-  static char ID;
-  explicit BBPassManager()
-    : PMDataManager(), FunctionPass(ID) {}
-
-  /// Execute all of the passes scheduled for execution.  Keep track of
-  /// whether any of the passes modifies the function, and if so, return true.
-  bool runOnFunction(Function &F) override;
-
-  /// Pass Manager itself does not invalidate any analysis info.
-  void getAnalysisUsage(AnalysisUsage &Info) const override {
-    Info.setPreservesAll();
-  }
-
-  bool doInitialization(Module &M) override;
-  bool doInitialization(Function &F);
-  bool doFinalization(Module &M) override;
-  bool doFinalization(Function &F);
-
-  PMDataManager *getAsPMDataManager() override { return this; }
-  Pass *getAsPass() override { return this; }
-
-  StringRef getPassName() const override { return "BasicBlock Pass Manager"; }
-
-  // Print passes managed by this manager
-  void dumpPassStructure(unsigned Offset) override {
-    dbgs().indent(Offset*2) << "BasicBlockPass Manager\n";
-    for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
-      BasicBlockPass *BP = getContainedPass(Index);
-      BP->dumpPassStructure(Offset + 1);
-      dumpLastUses(BP, Offset+1);
-    }
-  }
-
-  BasicBlockPass *getContainedPass(unsigned N) {
-    assert(N < PassVector.size() && "Pass number out of range!");
-    BasicBlockPass *BP = static_cast<BasicBlockPass *>(PassVector[N]);
-    return BP;
-  }
-
-  PassManagerType getPassManagerType() const override {
-    return PMT_BasicBlockPassManager;
-  }
-};
-
-char BBPassManager::ID = 0;
-} // End anonymous namespace
-
-namespace llvm {
-namespace legacy {
-//===----------------------------------------------------------------------===//
-// FunctionPassManagerImpl
-//
-/// FunctionPassManagerImpl manages FPPassManagers
-class FunctionPassManagerImpl : public Pass,
-                                public PMDataManager,
-                                public PMTopLevelManager {
-  virtual void anchor();
-private:
-  bool wasRun;
-public:
-  static char ID;
-  explicit FunctionPassManagerImpl() :
-    Pass(PT_PassManager, ID), PMDataManager(),
-    PMTopLevelManager(new FPPassManager()), wasRun(false) {}
-
-  /// \copydoc FunctionPassManager::add()
-  void add(Pass *P) {
-    schedulePass(P);
-  }
-
-  /// createPrinterPass - Get a function printer pass.
-  Pass *createPrinterPass(raw_ostream &O,
-                          const std::string &Banner) const override {
-    return createPrintFunctionPass(O, Banner);
-  }
-
-  // Prepare for running an on the fly pass, freeing memory if needed
-  // from a previous run.
-  void releaseMemoryOnTheFly();
-
-  /// run - Execute all of the passes scheduled for execution.  Keep track of
-  /// whether any of the passes modifies the module, and if so, return true.
-  bool run(Function &F);
-
-  /// doInitialization - Run all of the initializers for the function passes.
-  ///
-  bool doInitialization(Module &M) override;
-
-  /// doFinalization - Run all of the finalizers for the function passes.
-  ///
-  bool doFinalization(Module &M) override;
-
-
-  PMDataManager *getAsPMDataManager() override { return this; }
-  Pass *getAsPass() override { return this; }
-  PassManagerType getTopLevelPassManagerType() override {
-    return PMT_FunctionPassManager;
-  }
-
-  /// Pass Manager itself does not invalidate any analysis info.
-  void getAnalysisUsage(AnalysisUsage &Info) const override {
-    Info.setPreservesAll();
-  }
-
-  FPPassManager *getContainedManager(unsigned N) {
-    assert(N < PassManagers.size() && "Pass number out of range!");
-    FPPassManager *FP = static_cast<FPPassManager *>(PassManagers[N]);
-    return FP;
-  }
-};
-
-void FunctionPassManagerImpl::anchor() {}
-
-char FunctionPassManagerImpl::ID = 0;
-} // End of legacy namespace
-} // End of llvm namespace
-
-namespace {
-//===----------------------------------------------------------------------===//
-// MPPassManager
-//
-/// MPPassManager manages ModulePasses and function pass managers.
-/// It batches all Module passes and function pass managers together and
-/// sequences them to process one module.
-class MPPassManager : public Pass, public PMDataManager {
-public:
-  static char ID;
-  explicit MPPassManager() :
-    Pass(PT_PassManager, ID), PMDataManager() { }
-
-  // Delete on the fly managers.
-  ~MPPassManager() override {
-    for (auto &OnTheFlyManager : OnTheFlyManagers) {
-      FunctionPassManagerImpl *FPP = OnTheFlyManager.second;
-      delete FPP;
-    }
-  }
-
-  /// createPrinterPass - Get a module printer pass.
-  Pass *createPrinterPass(raw_ostream &O,
-                          const std::string &Banner) const override {
-    return createPrintModulePass(O, Banner);
-  }
-
-  /// run - Execute all of the passes scheduled for execution.  Keep track of
-  /// whether any of the passes modifies the module, and if so, return true.
-  bool runOnModule(Module &M);
-
-  using llvm::Pass::doInitialization;
-  using llvm::Pass::doFinalization;
-
-  /// Pass Manager itself does not invalidate any analysis info.
-  void getAnalysisUsage(AnalysisUsage &Info) const override {
-    Info.setPreservesAll();
-  }
-
-  /// Add RequiredPass into list of lower level passes required by pass P.
-  /// RequiredPass is run on the fly by Pass Manager when P requests it
-  /// through getAnalysis interface.
-  void addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass) override;
-
-  /// Return function pass corresponding to PassInfo PI, that is
-  /// required by module pass MP. Instantiate analysis pass, by using
-  /// its runOnFunction() for function F.
-  Pass* getOnTheFlyPass(Pass *MP, AnalysisID PI, Function &F) override;
-
-  StringRef getPassName() const override { return "Module Pass Manager"; }
-
-  PMDataManager *getAsPMDataManager() override { return this; }
-  Pass *getAsPass() override { return this; }
-
-  // Print passes managed by this manager
-  void dumpPassStructure(unsigned Offset) override {
-    dbgs().indent(Offset*2) << "ModulePass Manager\n";
-    for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
-      ModulePass *MP = getContainedPass(Index);
-      MP->dumpPassStructure(Offset + 1);
-      MapVector<Pass *, FunctionPassManagerImpl *>::const_iterator I =
-          OnTheFlyManagers.find(MP);
-      if (I != OnTheFlyManagers.end())
-        I->second->dumpPassStructure(Offset + 2);
-      dumpLastUses(MP, Offset+1);
-    }
-  }
-
-  ModulePass *getContainedPass(unsigned N) {
-    assert(N < PassVector.size() && "Pass number out of range!");
-    return static_cast<ModulePass *>(PassVector[N]);
-  }
-
-  PassManagerType getPassManagerType() const override {
-    return PMT_ModulePassManager;
-  }
-
- private:
-  /// Collection of on the fly FPPassManagers. These managers manage
-  /// function passes that are required by module passes.
-   MapVector<Pass *, FunctionPassManagerImpl *> OnTheFlyManagers;
-};
-
-char MPPassManager::ID = 0;
-} // End anonymous namespace
-
-namespace llvm {
-namespace legacy {
-//===----------------------------------------------------------------------===//
-// PassManagerImpl
-//
-
-/// PassManagerImpl manages MPPassManagers
-class PassManagerImpl : public Pass,
-                        public PMDataManager,
-                        public PMTopLevelManager {
-  virtual void anchor();
-
-public:
-  static char ID;
-  explicit PassManagerImpl() :
-    Pass(PT_PassManager, ID), PMDataManager(),
-                              PMTopLevelManager(new MPPassManager()) {}
-
-  /// \copydoc PassManager::add()
-  void add(Pass *P) {
-    schedulePass(P);
-  }
-
-  /// createPrinterPass - Get a module printer pass.
-  Pass *createPrinterPass(raw_ostream &O,
-                          const std::string &Banner) const override {
-    return createPrintModulePass(O, Banner);
-  }
-
-  /// run - Execute all of the passes scheduled for execution.  Keep track of
-  /// whether any of the passes modifies the module, and if so, return true.
-  bool run(Module &M);
-
-  using llvm::Pass::doInitialization;
-  using llvm::Pass::doFinalization;
-
-  /// Pass Manager itself does not invalidate any analysis info.
-  void getAnalysisUsage(AnalysisUsage &Info) const override {
-    Info.setPreservesAll();
-  }
-
-  PMDataManager *getAsPMDataManager() override { return this; }
-  Pass *getAsPass() override { return this; }
-  PassManagerType getTopLevelPassManagerType() override {
-    return PMT_ModulePassManager;
-  }
-
-  MPPassManager *getContainedManager(unsigned N) {
-    assert(N < PassManagers.size() && "Pass number out of range!");
-    MPPassManager *MP = static_cast<MPPassManager *>(PassManagers[N]);
-    return MP;
-  }
-};
-
-void PassManagerImpl::anchor() {}
-
-char PassManagerImpl::ID = 0;
-} // End of legacy namespace
-} // End of llvm namespace
-
-//===----------------------------------------------------------------------===//
-// PMTopLevelManager implementation
-
-/// Initialize top level manager. Create first pass manager.
-PMTopLevelManager::PMTopLevelManager(PMDataManager *PMDM) {
-  PMDM->setTopLevelManager(this);
-  addPassManager(PMDM);
-  activeStack.push(PMDM);
-}
-
-/// Set pass P as the last user of the given analysis passes.
-void
-PMTopLevelManager::setLastUser(ArrayRef<Pass*> AnalysisPasses, Pass *P) {
-  unsigned PDepth = 0;
-  if (P->getResolver())
-    PDepth = P->getResolver()->getPMDataManager().getDepth();
-
-  for (Pass *AP : AnalysisPasses) {
-    LastUser[AP] = P;
-
-    if (P == AP)
-      continue;
-
-    // Update the last users of passes that are required transitive by AP.
-    AnalysisUsage *AnUsage = findAnalysisUsage(AP);
-    const AnalysisUsage::VectorType &IDs = AnUsage->getRequiredTransitiveSet();
-    SmallVector<Pass *, 12> LastUses;
-    SmallVector<Pass *, 12> LastPMUses;
-    for (AnalysisID ID : IDs) {
-      Pass *AnalysisPass = findAnalysisPass(ID);
-      assert(AnalysisPass && "Expected analysis pass to exist.");
-      AnalysisResolver *AR = AnalysisPass->getResolver();
-      assert(AR && "Expected analysis resolver to exist.");
-      unsigned APDepth = AR->getPMDataManager().getDepth();
-
-      if (PDepth == APDepth)
-        LastUses.push_back(AnalysisPass);
-      else if (PDepth > APDepth)
-        LastPMUses.push_back(AnalysisPass);
-    }
-
-    setLastUser(LastUses, P);
-
-    // If this pass has a corresponding pass manager, push higher level
-    // analysis to this pass manager.
-    if (P->getResolver())
-      setLastUser(LastPMUses, P->getResolver()->getPMDataManager().getAsPass());
-
-
-    // If AP is the last user of other passes then make P last user of
-    // such passes.
-    for (auto LU : LastUser) {
-      if (LU.second == AP)
-        // DenseMap iterator is not invalidated here because
-        // this is just updating existing entries.
-        LastUser[LU.first] = P;
-    }
-  }
-}
-
-/// Collect passes whose last user is P
-void PMTopLevelManager::collectLastUses(SmallVectorImpl<Pass *> &LastUses,
-                                        Pass *P) {
-  DenseMap<Pass *, SmallPtrSet<Pass *, 8> >::iterator DMI =
-    InversedLastUser.find(P);
-  if (DMI == InversedLastUser.end())
-    return;
-
-  SmallPtrSet<Pass *, 8> &LU = DMI->second;
-  for (Pass *LUP : LU) {
-    LastUses.push_back(LUP);
-  }
-
-}
-
-AnalysisUsage *PMTopLevelManager::findAnalysisUsage(Pass *P) {
-  AnalysisUsage *AnUsage = nullptr;
-  auto DMI = AnUsageMap.find(P);
-  if (DMI != AnUsageMap.end())
-    AnUsage = DMI->second;
-  else {
-    // Look up the analysis usage from the pass instance (different instances
-    // of the same pass can produce different results), but unique the
-    // resulting object to reduce memory usage.  This helps to greatly reduce
-    // memory usage when we have many instances of only a few pass types
-    // (e.g. instcombine, simplifycfg, etc...) which tend to share a fixed set
-    // of dependencies.
-    AnalysisUsage AU;
-    P->getAnalysisUsage(AU);
-
-    AUFoldingSetNode* Node = nullptr;
-    FoldingSetNodeID ID;
-    AUFoldingSetNode::Profile(ID, AU);
-    void *IP = nullptr;
-    if (auto *N = UniqueAnalysisUsages.FindNodeOrInsertPos(ID, IP))
-      Node = N;
-    else {
-      Node = new (AUFoldingSetNodeAllocator.Allocate()) AUFoldingSetNode(AU);
-      UniqueAnalysisUsages.InsertNode(Node, IP);
-    }
-    assert(Node && "cached analysis usage must be non null");
-
-    AnUsageMap[P] = &Node->AU;
-    AnUsage = &Node->AU;
-  }
-  return AnUsage;
-}
-
-/// Schedule pass P for execution. Make sure that passes required by
-/// P are run before P is run. Update analysis info maintained by
-/// the manager. Remove dead passes. This is a recursive function.
-void PMTopLevelManager::schedulePass(Pass *P) {
-
-  // TODO : Allocate function manager for this pass, other wise required set
-  // may be inserted into previous function manager
-
-  // Give pass a chance to prepare the stage.
-  P->preparePassManager(activeStack);
-
-  // If P is an analysis pass and it is available then do not
-  // generate the analysis again. Stale analysis info should not be
-  // available at this point.
-  const PassInfo *PI = findAnalysisPassInfo(P->getPassID());
-  if (PI && PI->isAnalysis() && findAnalysisPass(P->getPassID())) {
-    // Remove any cached AnalysisUsage information.
-    AnUsageMap.erase(P);
-    delete P;
-    return;
-  }
-
-  AnalysisUsage *AnUsage = findAnalysisUsage(P);
-
-  bool checkAnalysis = true;
-  while (checkAnalysis) {
-    checkAnalysis = false;
-
-    const AnalysisUsage::VectorType &RequiredSet = AnUsage->getRequiredSet();
-    for (const AnalysisID ID : RequiredSet) {
-
-      Pass *AnalysisPass = findAnalysisPass(ID);
-      if (!AnalysisPass) {
-        const PassInfo *PI = findAnalysisPassInfo(ID);
-
-        if (!PI) {
-          // Pass P is not in the global PassRegistry
-          dbgs() << "Pass '"  << P->getPassName() << "' is not initialized." << "\n";
-          dbgs() << "Verify if there is a pass dependency cycle." << "\n";
-          dbgs() << "Required Passes:" << "\n";
-          for (const AnalysisID ID2 : RequiredSet) {
-            if (ID == ID2)
-              break;
-            Pass *AnalysisPass2 = findAnalysisPass(ID2);
-            if (AnalysisPass2) {
-              dbgs() << "\t" << AnalysisPass2->getPassName() << "\n";
-            } else {
-              dbgs() << "\t"   << "Error: Required pass not found! Possible causes:"  << "\n";
-              dbgs() << "\t\t" << "- Pass misconfiguration (e.g.: missing macros)"    << "\n";
-              dbgs() << "\t\t" << "- Corruption of the global PassRegistry"           << "\n";
-            }
-          }
-        }
-
-        assert(PI && "Expected required passes to be initialized");
-        AnalysisPass = PI->createPass();
-        if (P->getPotentialPassManagerType () ==
-            AnalysisPass->getPotentialPassManagerType())
-          // Schedule analysis pass that is managed by the same pass manager.
-          schedulePass(AnalysisPass);
-        else if (P->getPotentialPassManagerType () >
-                 AnalysisPass->getPotentialPassManagerType()) {
-          // Schedule analysis pass that is managed by a new manager.
-          schedulePass(AnalysisPass);
-          // Recheck analysis passes to ensure that required analyses that
-          // are already checked are still available.
-          checkAnalysis = true;
-        } else
-          // Do not schedule this analysis. Lower level analysis
-          // passes are run on the fly.
-          delete AnalysisPass;
-      }
-    }
-  }
-
-  // Now all required passes are available.
-  if (ImmutablePass *IP = P->getAsImmutablePass()) {
-    // P is a immutable pass and it will be managed by this
-    // top level manager. Set up analysis resolver to connect them.
-    PMDataManager *DM = getAsPMDataManager();
-    AnalysisResolver *AR = new AnalysisResolver(*DM);
-    P->setResolver(AR);
-    DM->initializeAnalysisImpl(P);
-    addImmutablePass(IP);
-    DM->recordAvailableAnalysis(IP);
-    return;
-  }
-
-  if (PI && !PI->isAnalysis() && shouldPrintBeforePass(PI->getPassArgument())) {
-    Pass *PP = P->createPrinterPass(
-        dbgs(), ("*** IR Dump Before " + P->getPassName() + " ***").str());
-    PP->assignPassManager(activeStack, getTopLevelPassManagerType());
-  }
-
-  // Add the requested pass to the best available pass manager.
-  P->assignPassManager(activeStack, getTopLevelPassManagerType());
-
-  if (PI && !PI->isAnalysis() && shouldPrintAfterPass(PI->getPassArgument())) {
-    Pass *PP = P->createPrinterPass(
-        dbgs(), ("*** IR Dump After " + P->getPassName() + " ***").str());
-    PP->assignPassManager(activeStack, getTopLevelPassManagerType());
-  }
-}
-
-/// Find the pass that implements Analysis AID. Search immutable
-/// passes and all pass managers. If desired pass is not found
-/// then return NULL.
-Pass *PMTopLevelManager::findAnalysisPass(AnalysisID AID) {
-  // For immutable passes we have a direct mapping from ID to pass, so check
-  // that first.
-  if (Pass *P = ImmutablePassMap.lookup(AID))
-    return P;
-
-  // Check pass managers
-  for (PMDataManager *PassManager : PassManagers)
-    if (Pass *P = PassManager->findAnalysisPass(AID, false))
-      return P;
-
-  // Check other pass managers
-  for (PMDataManager *IndirectPassManager : IndirectPassManagers)
-    if (Pass *P = IndirectPassManager->findAnalysisPass(AID, false))
-      return P;
-
-  return nullptr;
-}
-
-const PassInfo *PMTopLevelManager::findAnalysisPassInfo(AnalysisID AID) const {
-  const PassInfo *&PI = AnalysisPassInfos[AID];
-  if (!PI)
-    PI = PassRegistry::getPassRegistry()->getPassInfo(AID);
-  else
-    assert(PI == PassRegistry::getPassRegistry()->getPassInfo(AID) &&
-           "The pass info pointer changed for an analysis ID!");
-
-  return PI;
-}
-
-void PMTopLevelManager::addImmutablePass(ImmutablePass *P) {
-  P->initializePass();
-  ImmutablePasses.push_back(P);
-
-  // Add this pass to the map from its analysis ID. We clobber any prior runs
-  // of the pass in the map so that the last one added is the one found when
-  // doing lookups.
-  AnalysisID AID = P->getPassID();
-  ImmutablePassMap[AID] = P;
-
-  // Also add any interfaces implemented by the immutable pass to the map for
-  // fast lookup.
-  const PassInfo *PassInf = findAnalysisPassInfo(AID);
-  assert(PassInf && "Expected all immutable passes to be initialized");
-  for (const PassInfo *ImmPI : PassInf->getInterfacesImplemented())
-    ImmutablePassMap[ImmPI->getTypeInfo()] = P;
-}
-
-// Print passes managed by this top level manager.
-void PMTopLevelManager::dumpPasses() const {
-
-  if (PassDebugging < Structure)
-    return;
-
-  // Print out the immutable passes
-  for (unsigned i = 0, e = ImmutablePasses.size(); i != e; ++i) {
-    ImmutablePasses[i]->dumpPassStructure(0);
-  }
-
-  // Every class that derives from PMDataManager also derives from Pass
-  // (sometimes indirectly), but there's no inheritance relationship
-  // between PMDataManager and Pass, so we have to getAsPass to get
-  // from a PMDataManager* to a Pass*.
-  for (PMDataManager *Manager : PassManagers)
-    Manager->getAsPass()->dumpPassStructure(1);
-}
-
-void PMTopLevelManager::dumpArguments() const {
-
-  if (PassDebugging < Arguments)
-    return;
-
-  dbgs() << "Pass Arguments: ";
-  for (ImmutablePass *P : ImmutablePasses)
-    if (const PassInfo *PI = findAnalysisPassInfo(P->getPassID())) {
-      assert(PI && "Expected all immutable passes to be initialized");
-      if (!PI->isAnalysisGroup())
-        dbgs() << " -" << PI->getPassArgument();
-    }
-  for (PMDataManager *PM : PassManagers)
-    PM->dumpPassArguments();
-  dbgs() << "\n";
-}
-
-void PMTopLevelManager::initializeAllAnalysisInfo() {
-  for (PMDataManager *PM : PassManagers)
-    PM->initializeAnalysisInfo();
-
-  // Initailize other pass managers
-  for (PMDataManager *IPM : IndirectPassManagers)
-    IPM->initializeAnalysisInfo();
-
-  for (auto LU : LastUser) {
-    SmallPtrSet<Pass *, 8> &L = InversedLastUser[LU.second];
-    L.insert(LU.first);
-  }
-}
-
-/// Destructor
-PMTopLevelManager::~PMTopLevelManager() {
-  for (PMDataManager *PM : PassManagers)
-    delete PM;
-
-  for (ImmutablePass *P : ImmutablePasses)
-    delete P;
-}
-
-//===----------------------------------------------------------------------===//
-// PMDataManager implementation
-
-/// Augement AvailableAnalysis by adding analysis made available by pass P.
-void PMDataManager::recordAvailableAnalysis(Pass *P) {
-  AnalysisID PI = P->getPassID();
-
-  AvailableAnalysis[PI] = P;
-
-  assert(!AvailableAnalysis.empty());
-
-  // This pass is the current implementation of all of the interfaces it
-  // implements as well.
-  const PassInfo *PInf = TPM->findAnalysisPassInfo(PI);
-  if (!PInf) return;
-  const std::vector<const PassInfo*> &II = PInf->getInterfacesImplemented();
-  for (unsigned i = 0, e = II.size(); i != e; ++i)
-    AvailableAnalysis[II[i]->getTypeInfo()] = P;
-}
-
-// Return true if P preserves high level analysis used by other
-// passes managed by this manager
-bool PMDataManager::preserveHigherLevelAnalysis(Pass *P) {
-  AnalysisUsage *AnUsage = TPM->findAnalysisUsage(P);
-  if (AnUsage->getPreservesAll())
-    return true;
-
-  const AnalysisUsage::VectorType &PreservedSet = AnUsage->getPreservedSet();
-  for (Pass *P1 : HigherLevelAnalysis) {
-    if (P1->getAsImmutablePass() == nullptr &&
-        !is_contained(PreservedSet, P1->getPassID()))
-      return false;
-  }
-
-  return true;
-}
-
-/// verifyPreservedAnalysis -- Verify analysis preserved by pass P.
-void PMDataManager::verifyPreservedAnalysis(Pass *P) {
-  // Don't do this unless assertions are enabled.
-#ifdef NDEBUG
-  return;
-#endif
-  AnalysisUsage *AnUsage = TPM->findAnalysisUsage(P);
-  const AnalysisUsage::VectorType &PreservedSet = AnUsage->getPreservedSet();
-
-  // Verify preserved analysis
-  for (AnalysisID AID : PreservedSet) {
-    if (Pass *AP = findAnalysisPass(AID, true)) {
-      TimeRegion PassTimer(getPassTimer(AP));
-      AP->verifyAnalysis();
-    }
-  }
-}
-
-/// Remove Analysis not preserved by Pass P
-void PMDataManager::removeNotPreservedAnalysis(Pass *P) {
-  AnalysisUsage *AnUsage = TPM->findAnalysisUsage(P);
-  if (AnUsage->getPreservesAll())
-    return;
-
-  const AnalysisUsage::VectorType &PreservedSet = AnUsage->getPreservedSet();
-  for (DenseMap<AnalysisID, Pass*>::iterator I = AvailableAnalysis.begin(),
-         E = AvailableAnalysis.end(); I != E; ) {
-    DenseMap<AnalysisID, Pass*>::iterator Info = I++;
-    if (Info->second->getAsImmutablePass() == nullptr &&
-        !is_contained(PreservedSet, Info->first)) {
-      // Remove this analysis
-      if (PassDebugging >= Details) {
-        Pass *S = Info->second;
-        dbgs() << " -- '" <<  P->getPassName() << "' is not preserving '";
-        dbgs() << S->getPassName() << "'\n";
-      }
-      AvailableAnalysis.erase(Info);
-    }
-  }
-
-  // Check inherited analysis also. If P is not preserving analysis
-  // provided by parent manager then remove it here.
-  for (unsigned Index = 0; Index < PMT_Last; ++Index) {
-
-    if (!InheritedAnalysis[Index])
-      continue;
-
-    for (DenseMap<AnalysisID, Pass*>::iterator
-           I = InheritedAnalysis[Index]->begin(),
-           E = InheritedAnalysis[Index]->end(); I != E; ) {
-      DenseMap<AnalysisID, Pass *>::iterator Info = I++;
-      if (Info->second->getAsImmutablePass() == nullptr &&
-          !is_contained(PreservedSet, Info->first)) {
-        // Remove this analysis
-        if (PassDebugging >= Details) {
-          Pass *S = Info->second;
-          dbgs() << " -- '" <<  P->getPassName() << "' is not preserving '";
-          dbgs() << S->getPassName() << "'\n";
-        }
-        InheritedAnalysis[Index]->erase(Info);
-      }
-    }
-  }
-}
-
-/// Remove analysis passes that are not used any longer
-void PMDataManager::removeDeadPasses(Pass *P, StringRef Msg,
-                                     enum PassDebuggingString DBG_STR) {
-
-  SmallVector<Pass *, 12> DeadPasses;
-
-  // If this is a on the fly manager then it does not have TPM.
-  if (!TPM)
-    return;
-
-  TPM->collectLastUses(DeadPasses, P);
-
-  if (PassDebugging >= Details && !DeadPasses.empty()) {
-    dbgs() << " -*- '" <<  P->getPassName();
-    dbgs() << "' is the last user of following pass instances.";
-    dbgs() << " Free these instances\n";
-  }
-
-  for (Pass *P : DeadPasses)
-    freePass(P, Msg, DBG_STR);
-}
-
-void PMDataManager::freePass(Pass *P, StringRef Msg,
-                             enum PassDebuggingString DBG_STR) {
-  dumpPassInfo(P, FREEING_MSG, DBG_STR, Msg);
-
-  {
-    // If the pass crashes releasing memory, remember this.
-    PassManagerPrettyStackEntry X(P);
-    TimeRegion PassTimer(getPassTimer(P));
-
-    P->releaseMemory();
-  }
-
-  AnalysisID PI = P->getPassID();
-  if (const PassInfo *PInf = TPM->findAnalysisPassInfo(PI)) {
-    // Remove the pass itself (if it is not already removed).
-    AvailableAnalysis.erase(PI);
-
-    // Remove all interfaces this pass implements, for which it is also
-    // listed as the available implementation.
-    const std::vector<const PassInfo*> &II = PInf->getInterfacesImplemented();
-    for (unsigned i = 0, e = II.size(); i != e; ++i) {
-      DenseMap<AnalysisID, Pass*>::iterator Pos =
-        AvailableAnalysis.find(II[i]->getTypeInfo());
-      if (Pos != AvailableAnalysis.end() && Pos->second == P)
-        AvailableAnalysis.erase(Pos);
-    }
-  }
-}
-
-/// Add pass P into the PassVector. Update
-/// AvailableAnalysis appropriately if ProcessAnalysis is true.
-void PMDataManager::add(Pass *P, bool ProcessAnalysis) {
-  // This manager is going to manage pass P. Set up analysis resolver
-  // to connect them.
-  AnalysisResolver *AR = new AnalysisResolver(*this);
-  P->setResolver(AR);
-
-  // If a FunctionPass F is the last user of ModulePass info M
-  // then the F's manager, not F, records itself as a last user of M.
-  SmallVector<Pass *, 12> TransferLastUses;
-
-  if (!ProcessAnalysis) {
-    // Add pass
-    PassVector.push_back(P);
-    return;
-  }
-
-  // At the moment, this pass is the last user of all required passes.
-  SmallVector<Pass *, 12> LastUses;
-  SmallVector<Pass *, 8> UsedPasses;
-  SmallVector<AnalysisID, 8> ReqAnalysisNotAvailable;
-
-  unsigned PDepth = this->getDepth();
-
-  collectRequiredAndUsedAnalyses(UsedPasses, ReqAnalysisNotAvailable, P);
-  for (Pass *PUsed : UsedPasses) {
-    unsigned RDepth = 0;
-
-    assert(PUsed->getResolver() && "Analysis Resolver is not set");
-    PMDataManager &DM = PUsed->getResolver()->getPMDataManager();
-    RDepth = DM.getDepth();
-
-    if (PDepth == RDepth)
-      LastUses.push_back(PUsed);
-    else if (PDepth > RDepth) {
-      // Let the parent claim responsibility of last use
-      TransferLastUses.push_back(PUsed);
-      // Keep track of higher level analysis used by this manager.
-      HigherLevelAnalysis.push_back(PUsed);
-    } else
-      llvm_unreachable("Unable to accommodate Used Pass");
-  }
-
-  // Set P as P's last user until someone starts using P.
-  // However, if P is a Pass Manager then it does not need
-  // to record its last user.
-  if (!P->getAsPMDataManager())
-    LastUses.push_back(P);
-  TPM->setLastUser(LastUses, P);
-
-  if (!TransferLastUses.empty()) {
-    Pass *My_PM = getAsPass();
-    TPM->setLastUser(TransferLastUses, My_PM);
-    TransferLastUses.clear();
-  }
-
-  // Now, take care of required analyses that are not available.
-  for (AnalysisID ID : ReqAnalysisNotAvailable) {
-    const PassInfo *PI = TPM->findAnalysisPassInfo(ID);
-    Pass *AnalysisPass = PI->createPass();
-    this->addLowerLevelRequiredPass(P, AnalysisPass);
-  }
-
-  // Take a note of analysis required and made available by this pass.
-  // Remove the analysis not preserved by this pass
-  removeNotPreservedAnalysis(P);
-  recordAvailableAnalysis(P);
-
-  // Add pass
-  PassVector.push_back(P);
-}
-
-
-/// Populate UP with analysis pass that are used or required by
-/// pass P and are available. Populate RP_NotAvail with analysis
-/// pass that are required by pass P but are not available.
-void PMDataManager::collectRequiredAndUsedAnalyses(
-    SmallVectorImpl<Pass *> &UP, SmallVectorImpl<AnalysisID> &RP_NotAvail,
-    Pass *P) {
-  AnalysisUsage *AnUsage = TPM->findAnalysisUsage(P);
-
-  for (const auto &UsedID : AnUsage->getUsedSet())
-    if (Pass *AnalysisPass = findAnalysisPass(UsedID, true))
-      UP.push_back(AnalysisPass);
-
-  for (const auto &RequiredID : AnUsage->getRequiredSet())
-    if (Pass *AnalysisPass = findAnalysisPass(RequiredID, true))
-      UP.push_back(AnalysisPass);
-    else
-      RP_NotAvail.push_back(RequiredID);
-
-  for (const auto &RequiredID : AnUsage->getRequiredTransitiveSet())
-    if (Pass *AnalysisPass = findAnalysisPass(RequiredID, true))
-      UP.push_back(AnalysisPass);
-    else
-      RP_NotAvail.push_back(RequiredID);
-}
-
-// All Required analyses should be available to the pass as it runs!  Here
-// we fill in the AnalysisImpls member of the pass so that it can
-// successfully use the getAnalysis() method to retrieve the
-// implementations it needs.
-//
-void PMDataManager::initializeAnalysisImpl(Pass *P) {
-  AnalysisUsage *AnUsage = TPM->findAnalysisUsage(P);
-
-  for (const AnalysisID ID : AnUsage->getRequiredSet()) {
-    Pass *Impl = findAnalysisPass(ID, true);
-    if (!Impl)
-      // This may be analysis pass that is initialized on the fly.
-      // If that is not the case then it will raise an assert when it is used.
-      continue;
-    AnalysisResolver *AR = P->getResolver();
-    assert(AR && "Analysis Resolver is not set");
-    AR->addAnalysisImplsPair(ID, Impl);
-  }
-}
-
-/// Find the pass that implements Analysis AID. If desired pass is not found
-/// then return NULL.
-Pass *PMDataManager::findAnalysisPass(AnalysisID AID, bool SearchParent) {
-
-  // Check if AvailableAnalysis map has one entry.
-  DenseMap<AnalysisID, Pass*>::const_iterator I =  AvailableAnalysis.find(AID);
-
-  if (I != AvailableAnalysis.end())
-    return I->second;
-
-  // Search Parents through TopLevelManager
-  if (SearchParent)
-    return TPM->findAnalysisPass(AID);
-
-  return nullptr;
-}
-
-// Print list of passes that are last used by P.
-void PMDataManager::dumpLastUses(Pass *P, unsigned Offset) const{
-
-  SmallVector<Pass *, 12> LUses;
-
-  // If this is a on the fly manager then it does not have TPM.
-  if (!TPM)
-    return;
-
-  TPM->collectLastUses(LUses, P);
-
-  for (Pass *P : LUses) {
-    dbgs() << "--" << std::string(Offset*2, ' ');
-    P->dumpPassStructure(0);
-  }
-}
-
-void PMDataManager::dumpPassArguments() const {
-  for (Pass *P : PassVector) {
-    if (PMDataManager *PMD = P->getAsPMDataManager())
-      PMD->dumpPassArguments();
-    else
-      if (const PassInfo *PI =
-            TPM->findAnalysisPassInfo(P->getPassID()))
-        if (!PI->isAnalysisGroup())
-          dbgs() << " -" << PI->getPassArgument();
-  }
-}
-
-void PMDataManager::dumpPassInfo(Pass *P, enum PassDebuggingString S1,
-                                 enum PassDebuggingString S2,
-                                 StringRef Msg) {
-  if (PassDebugging < Executions)
-    return;
-  dbgs() << "[" << std::chrono::system_clock::now() << "] " << (void *)this
-         << std::string(getDepth() * 2 + 1, ' ');
-  switch (S1) {
-  case EXECUTION_MSG:
-    dbgs() << "Executing Pass '" << P->getPassName();
-    break;
-  case MODIFICATION_MSG:
-    dbgs() << "Made Modification '" << P->getPassName();
-    break;
-  case FREEING_MSG:
-    dbgs() << " Freeing Pass '" << P->getPassName();
-    break;
-  default:
-    break;
-  }
-  switch (S2) {
-  case ON_BASICBLOCK_MSG:
-    dbgs() << "' on BasicBlock '" << Msg << "'...\n";
-    break;
-  case ON_FUNCTION_MSG:
-    dbgs() << "' on Function '" << Msg << "'...\n";
-    break;
-  case ON_MODULE_MSG:
-    dbgs() << "' on Module '"  << Msg << "'...\n";
-    break;
-  case ON_REGION_MSG:
-    dbgs() << "' on Region '"  << Msg << "'...\n";
-    break;
-  case ON_LOOP_MSG:
-    dbgs() << "' on Loop '" << Msg << "'...\n";
-    break;
-  case ON_CG_MSG:
-    dbgs() << "' on Call Graph Nodes '" << Msg << "'...\n";
-    break;
-  default:
-    break;
-  }
-}
-
-void PMDataManager::dumpRequiredSet(const Pass *P) const {
-  if (PassDebugging < Details)
-    return;
-
-  AnalysisUsage analysisUsage;
-  P->getAnalysisUsage(analysisUsage);
-  dumpAnalysisUsage("Required", P, analysisUsage.getRequiredSet());
-}
-
-void PMDataManager::dumpPreservedSet(const Pass *P) const {
-  if (PassDebugging < Details)
-    return;
-
-  AnalysisUsage analysisUsage;
-  P->getAnalysisUsage(analysisUsage);
-  dumpAnalysisUsage("Preserved", P, analysisUsage.getPreservedSet());
-}
-
-void PMDataManager::dumpUsedSet(const Pass *P) const {
-  if (PassDebugging < Details)
-    return;
-
-  AnalysisUsage analysisUsage;
-  P->getAnalysisUsage(analysisUsage);
-  dumpAnalysisUsage("Used", P, analysisUsage.getUsedSet());
-}
-
-void PMDataManager::dumpAnalysisUsage(StringRef Msg, const Pass *P,
-                                   const AnalysisUsage::VectorType &Set) const {
-  assert(PassDebugging >= Details);
-  if (Set.empty())
-    return;
-  dbgs() << (const void*)P << std::string(getDepth()*2+3, ' ') << Msg << " Analyses:";
-  for (unsigned i = 0; i != Set.size(); ++i) {
-    if (i) dbgs() << ',';
-    const PassInfo *PInf = TPM->findAnalysisPassInfo(Set[i]);
-    if (!PInf) {
-      // Some preserved passes, such as AliasAnalysis, may not be initialized by
-      // all drivers.
-      dbgs() << " Uninitialized Pass";
-      continue;
-    }
-    dbgs() << ' ' << PInf->getPassName();
-  }
-  dbgs() << '\n';
-}
-
-/// Add RequiredPass into list of lower level passes required by pass P.
-/// RequiredPass is run on the fly by Pass Manager when P requests it
-/// through getAnalysis interface.
-/// This should be handled by specific pass manager.
-void PMDataManager::addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass) {
-  if (TPM) {
-    TPM->dumpArguments();
-    TPM->dumpPasses();
-  }
-
-  // Module Level pass may required Function Level analysis info
-  // (e.g. dominator info). Pass manager uses on the fly function pass manager
-  // to provide this on demand. In that case, in Pass manager terminology,
-  // module level pass is requiring lower level analysis info managed by
-  // lower level pass manager.
-
-  // When Pass manager is not able to order required analysis info, Pass manager
-  // checks whether any lower level manager will be able to provide this
-  // analysis info on demand or not.
-#ifndef NDEBUG
-  dbgs() << "Unable to schedule '" << RequiredPass->getPassName();
-  dbgs() << "' required by '" << P->getPassName() << "'\n";
-#endif
-  llvm_unreachable("Unable to schedule pass");
-}
-
-Pass *PMDataManager::getOnTheFlyPass(Pass *P, AnalysisID PI, Function &F) {
-  llvm_unreachable("Unable to find on the fly pass");
-}
-
-// Destructor
-PMDataManager::~PMDataManager() {
-  for (Pass *P : PassVector)
-    delete P;
-}
-
-//===----------------------------------------------------------------------===//
-// NOTE: Is this the right place to define this method ?
-// getAnalysisIfAvailable - Return analysis result or null if it doesn't exist.
-Pass *AnalysisResolver::getAnalysisIfAvailable(AnalysisID ID, bool dir) const {
-  return PM.findAnalysisPass(ID, dir);
-}
-
-Pass *AnalysisResolver::findImplPass(Pass *P, AnalysisID AnalysisPI,
-                                     Function &F) {
-  return PM.getOnTheFlyPass(P, AnalysisPI, F);
-}
-
-//===----------------------------------------------------------------------===//
-// BBPassManager implementation
-
-/// Execute all of the passes scheduled for execution by invoking
-/// runOnBasicBlock method.  Keep track of whether any of the passes modifies
-/// the function, and if so, return true.
-bool BBPassManager::runOnFunction(Function &F) {
-  if (F.isDeclaration())
-    return false;
-
-  bool Changed = doInitialization(F);
-  Module &M = *F.getParent();
-
-  unsigned InstrCount, BBSize = 0;
-  StringMap<std::pair<unsigned, unsigned>> FunctionToInstrCount;
-  bool EmitICRemark = M.shouldEmitInstrCountChangedRemark();
-  if (EmitICRemark)
-    InstrCount = initSizeRemarkInfo(M, FunctionToInstrCount);
-
-  for (BasicBlock &BB : F) {
-    // Collect the initial size of the basic block.
-    if (EmitICRemark)
-      BBSize = BB.size();
-    for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
-      BasicBlockPass *BP = getContainedPass(Index);
-      bool LocalChanged = false;
-
-      dumpPassInfo(BP, EXECUTION_MSG, ON_BASICBLOCK_MSG, BB.getName());
-      dumpRequiredSet(BP);
-
-      initializeAnalysisImpl(BP);
-
-      {
-        // If the pass crashes, remember this.
-        PassManagerPrettyStackEntry X(BP, BB);
-        TimeRegion PassTimer(getPassTimer(BP));
-        LocalChanged |= BP->runOnBasicBlock(BB);
-        if (EmitICRemark) {
-          unsigned NewSize = BB.size();
-          // Update the size of the basic block, emit a remark, and update the
-          // size of the module.
-          if (NewSize != BBSize) {
-            int64_t Delta =
-                static_cast<int64_t>(NewSize) - static_cast<int64_t>(BBSize);
-            emitInstrCountChangedRemark(BP, M, Delta, InstrCount,
-                                        FunctionToInstrCount, &F);
-            InstrCount = static_cast<int64_t>(InstrCount) + Delta;
-            BBSize = NewSize;
-          }
-        }
-      }
-
-      Changed |= LocalChanged;
-      if (LocalChanged)
-        dumpPassInfo(BP, MODIFICATION_MSG, ON_BASICBLOCK_MSG,
-                     BB.getName());
-      dumpPreservedSet(BP);
-      dumpUsedSet(BP);
-
-      verifyPreservedAnalysis(BP);
-      removeNotPreservedAnalysis(BP);
-      recordAvailableAnalysis(BP);
-      removeDeadPasses(BP, BB.getName(), ON_BASICBLOCK_MSG);
-    }
-  }
-
-  return doFinalization(F) || Changed;
-}
-
-// Implement doInitialization and doFinalization
-bool BBPassManager::doInitialization(Module &M) {
-  bool Changed = false;
-
-  for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index)
-    Changed |= getContainedPass(Index)->doInitialization(M);
-
-  return Changed;
-}
-
-bool BBPassManager::doFinalization(Module &M) {
-  bool Changed = false;
-
-  for (int Index = getNumContainedPasses() - 1; Index >= 0; --Index)
-    Changed |= getContainedPass(Index)->doFinalization(M);
-
-  return Changed;
-}
-
-bool BBPassManager::doInitialization(Function &F) {
-  bool Changed = false;
-
-  for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
-    BasicBlockPass *BP = getContainedPass(Index);
-    Changed |= BP->doInitialization(F);
-  }
-
-  return Changed;
-}
-
-bool BBPassManager::doFinalization(Function &F) {
-  bool Changed = false;
-
-  for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
-    BasicBlockPass *BP = getContainedPass(Index);
-    Changed |= BP->doFinalization(F);
-  }
-
-  return Changed;
-}
-
-
-//===----------------------------------------------------------------------===//
-// FunctionPassManager implementation
-
-/// Create new Function pass manager
-FunctionPassManager::FunctionPassManager(Module *m) : M(m) {
-  FPM = new FunctionPassManagerImpl();
-  // FPM is the top level manager.
-  FPM->setTopLevelManager(FPM);
-
-  AnalysisResolver *AR = new AnalysisResolver(*FPM);
-  FPM->setResolver(AR);
-}
-
-FunctionPassManager::~FunctionPassManager() {
-  delete FPM;
-}
-
-void FunctionPassManager::add(Pass *P) {
-  FPM->add(P);
-}
-
-/// run - Execute all of the passes scheduled for execution.  Keep
-/// track of whether any of the passes modifies the function, and if
-/// so, return true.
-///
-bool FunctionPassManager::run(Function &F) {
-  handleAllErrors(F.materialize(), [&](ErrorInfoBase &EIB) {
-    report_fatal_error("Error reading bitcode file: " + EIB.message());
-  });
-  return FPM->run(F);
-}
-
-
-/// doInitialization - Run all of the initializers for the function passes.
-///
-bool FunctionPassManager::doInitialization() {
-  return FPM->doInitialization(*M);
-}
-
-/// doFinalization - Run all of the finalizers for the function passes.
-///
-bool FunctionPassManager::doFinalization() {
-  return FPM->doFinalization(*M);
-}
-
-//===----------------------------------------------------------------------===//
-// FunctionPassManagerImpl implementation
-//
-bool FunctionPassManagerImpl::doInitialization(Module &M) {
-  bool Changed = false;
-
-  dumpArguments();
-  dumpPasses();
-
-  for (ImmutablePass *ImPass : getImmutablePasses())
-    Changed |= ImPass->doInitialization(M);
-
-  for (unsigned Index = 0; Index < getNumContainedManagers(); ++Index)
-    Changed |= getContainedManager(Index)->doInitialization(M);
-
-  return Changed;
-}
-
-bool FunctionPassManagerImpl::doFinalization(Module &M) {
-  bool Changed = false;
-
-  for (int Index = getNumContainedManagers() - 1; Index >= 0; --Index)
-    Changed |= getContainedManager(Index)->doFinalization(M);
-
-  for (ImmutablePass *ImPass : getImmutablePasses())
-    Changed |= ImPass->doFinalization(M);
-
-  return Changed;
-}
-
-/// cleanup - After running all passes, clean up pass manager cache.
-void FPPassManager::cleanup() {
- for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
-    FunctionPass *FP = getContainedPass(Index);
-    AnalysisResolver *AR = FP->getResolver();
-    assert(AR && "Analysis Resolver is not set");
-    AR->clearAnalysisImpls();
- }
-}
-
-void FunctionPassManagerImpl::releaseMemoryOnTheFly() {
-  if (!wasRun)
-    return;
-  for (unsigned Index = 0; Index < getNumContainedManagers(); ++Index) {
-    FPPassManager *FPPM = getContainedManager(Index);
-    for (unsigned Index = 0; Index < FPPM->getNumContainedPasses(); ++Index) {
-      FPPM->getContainedPass(Index)->releaseMemory();
-    }
-  }
-  wasRun = false;
-}
-
-// Execute all the passes managed by this top level manager.
-// Return true if any function is modified by a pass.
-bool FunctionPassManagerImpl::run(Function &F) {
-  bool Changed = false;
-
-  initializeAllAnalysisInfo();
-  for (unsigned Index = 0; Index < getNumContainedManagers(); ++Index) {
-    Changed |= getContainedManager(Index)->runOnFunction(F);
-    F.getContext().yield();
-  }
-
-  for (unsigned Index = 0; Index < getNumContainedManagers(); ++Index)
-    getContainedManager(Index)->cleanup();
-
-  wasRun = true;
-  return Changed;
-}
-
-//===----------------------------------------------------------------------===//
-// FPPassManager implementation
-
-char FPPassManager::ID = 0;
-/// Print passes managed by this manager
-void FPPassManager::dumpPassStructure(unsigned Offset) {
-  dbgs().indent(Offset*2) << "FunctionPass Manager\n";
-  for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
-    FunctionPass *FP = getContainedPass(Index);
-    FP->dumpPassStructure(Offset + 1);
-    dumpLastUses(FP, Offset+1);
-  }
-}
-
-
-/// Execute all of the passes scheduled for execution by invoking
-/// runOnFunction method.  Keep track of whether any of the passes modifies
-/// the function, and if so, return true.
-bool FPPassManager::runOnFunction(Function &F) {
-  if (F.isDeclaration())
-    return false;
-
-  bool Changed = false;
-  Module &M = *F.getParent();
-  // Collect inherited analysis from Module level pass manager.
-  populateInheritedAnalysis(TPM->activeStack);
-
-  unsigned InstrCount, FunctionSize = 0;
-  StringMap<std::pair<unsigned, unsigned>> FunctionToInstrCount;
-  bool EmitICRemark = M.shouldEmitInstrCountChangedRemark();
-  // Collect the initial size of the module.
-  if (EmitICRemark) {
-    InstrCount = initSizeRemarkInfo(M, FunctionToInstrCount);
-    FunctionSize = F.getInstructionCount();
-  }
-
-  for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
-    FunctionPass *FP = getContainedPass(Index);
-    bool LocalChanged = false;
-
-    dumpPassInfo(FP, EXECUTION_MSG, ON_FUNCTION_MSG, F.getName());
-    dumpRequiredSet(FP);
-
-    initializeAnalysisImpl(FP);
-
-    {
-      PassManagerPrettyStackEntry X(FP, F);
-      TimeRegion PassTimer(getPassTimer(FP));
-      LocalChanged |= FP->runOnFunction(F);
-      if (EmitICRemark) {
-        unsigned NewSize = F.getInstructionCount();
-
-        // Update the size of the function, emit a remark, and update the size
-        // of the module.
-        if (NewSize != FunctionSize) {
-          int64_t Delta = static_cast<int64_t>(NewSize) -
-                          static_cast<int64_t>(FunctionSize);
-          emitInstrCountChangedRemark(FP, M, Delta, InstrCount,
-                                      FunctionToInstrCount, &F);
-          InstrCount = static_cast<int64_t>(InstrCount) + Delta;
-          FunctionSize = NewSize;
-        }
-      }
-    }
-
-    Changed |= LocalChanged;
-    if (LocalChanged)
-      dumpPassInfo(FP, MODIFICATION_MSG, ON_FUNCTION_MSG, F.getName());
-    dumpPreservedSet(FP);
-    dumpUsedSet(FP);
-
-    verifyPreservedAnalysis(FP);
-    removeNotPreservedAnalysis(FP);
-    recordAvailableAnalysis(FP);
-    removeDeadPasses(FP, F.getName(), ON_FUNCTION_MSG);
-  }
-  return Changed;
-}
-
-bool FPPassManager::runOnModule(Module &M) {
-  bool Changed = false;
-
-  for (Function &F : M)
-    Changed |= runOnFunction(F);
-
-  return Changed;
-}
-
-bool FPPassManager::doInitialization(Module &M) {
-  bool Changed = false;
-
-  for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index)
-    Changed |= getContainedPass(Index)->doInitialization(M);
-
-  return Changed;
-}
-
-bool FPPassManager::doFinalization(Module &M) {
-  bool Changed = false;
-
-  for (int Index = getNumContainedPasses() - 1; Index >= 0; --Index)
-    Changed |= getContainedPass(Index)->doFinalization(M);
-
-  return Changed;
-}
-
-//===----------------------------------------------------------------------===//
-// MPPassManager implementation
-
-/// Execute all of the passes scheduled for execution by invoking
-/// runOnModule method.  Keep track of whether any of the passes modifies
-/// the module, and if so, return true.
-bool
-MPPassManager::runOnModule(Module &M) {
-  bool Changed = false;
-
-  // Initialize on-the-fly passes
-  for (auto &OnTheFlyManager : OnTheFlyManagers) {
-    FunctionPassManagerImpl *FPP = OnTheFlyManager.second;
-    Changed |= FPP->doInitialization(M);
-  }
-
-  // Initialize module passes
-  for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index)
-    Changed |= getContainedPass(Index)->doInitialization(M);
-
-  unsigned InstrCount, ModuleCount = 0;
-  StringMap<std::pair<unsigned, unsigned>> FunctionToInstrCount;
-  bool EmitICRemark = M.shouldEmitInstrCountChangedRemark();
-  // Collect the initial size of the module.
-  if (EmitICRemark) {
-    InstrCount = initSizeRemarkInfo(M, FunctionToInstrCount);
-    ModuleCount = InstrCount;
-  }
-
-  for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
-    ModulePass *MP = getContainedPass(Index);
-    bool LocalChanged = false;
-
-    dumpPassInfo(MP, EXECUTION_MSG, ON_MODULE_MSG, M.getModuleIdentifier());
-    dumpRequiredSet(MP);
-
-    initializeAnalysisImpl(MP);
-
-    {
-      PassManagerPrettyStackEntry X(MP, M);
-      TimeRegion PassTimer(getPassTimer(MP));
-
-      LocalChanged |= MP->runOnModule(M);
-      if (EmitICRemark) {
-        // Update the size of the module.
-        ModuleCount = M.getInstructionCount();
-        if (ModuleCount != InstrCount) {
-          int64_t Delta = static_cast<int64_t>(ModuleCount) -
-                          static_cast<int64_t>(InstrCount);
-          emitInstrCountChangedRemark(MP, M, Delta, InstrCount,
-                                      FunctionToInstrCount);
-          InstrCount = ModuleCount;
-        }
-      }
-    }
-
-    Changed |= LocalChanged;
-    if (LocalChanged)
-      dumpPassInfo(MP, MODIFICATION_MSG, ON_MODULE_MSG,
-                   M.getModuleIdentifier());
-    dumpPreservedSet(MP);
-    dumpUsedSet(MP);
-
-    verifyPreservedAnalysis(MP);
-    removeNotPreservedAnalysis(MP);
-    recordAvailableAnalysis(MP);
-    removeDeadPasses(MP, M.getModuleIdentifier(), ON_MODULE_MSG);
-  }
-
-  // Finalize module passes
-  for (int Index = getNumContainedPasses() - 1; Index >= 0; --Index)
-    Changed |= getContainedPass(Index)->doFinalization(M);
-
-  // Finalize on-the-fly passes
-  for (auto &OnTheFlyManager : OnTheFlyManagers) {
-    FunctionPassManagerImpl *FPP = OnTheFlyManager.second;
-    // We don't know when is the last time an on-the-fly pass is run,
-    // so we need to releaseMemory / finalize here
-    FPP->releaseMemoryOnTheFly();
-    Changed |= FPP->doFinalization(M);
-  }
-
-  return Changed;
-}
-
-/// Add RequiredPass into list of lower level passes required by pass P.
-/// RequiredPass is run on the fly by Pass Manager when P requests it
-/// through getAnalysis interface.
-void MPPassManager::addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass) {
-  assert(P->getPotentialPassManagerType() == PMT_ModulePassManager &&
-         "Unable to handle Pass that requires lower level Analysis pass");
-  assert((P->getPotentialPassManagerType() <
-          RequiredPass->getPotentialPassManagerType()) &&
-         "Unable to handle Pass that requires lower level Analysis pass");
-  if (!RequiredPass)
-    return;
-
-  FunctionPassManagerImpl *FPP = OnTheFlyManagers[P];
-  if (!FPP) {
-    FPP = new FunctionPassManagerImpl();
-    // FPP is the top level manager.
-    FPP->setTopLevelManager(FPP);
-
-    OnTheFlyManagers[P] = FPP;
-  }
-  const PassInfo *RequiredPassPI =
-      TPM->findAnalysisPassInfo(RequiredPass->getPassID());
-
-  Pass *FoundPass = nullptr;
-  if (RequiredPassPI && RequiredPassPI->isAnalysis()) {
-    FoundPass =
-      ((PMTopLevelManager*)FPP)->findAnalysisPass(RequiredPass->getPassID());
-  }
-  if (!FoundPass) {
-    FoundPass = RequiredPass;
-    // This should be guaranteed to add RequiredPass to the passmanager given
-    // that we checked for an available analysis above.
-    FPP->add(RequiredPass);
-  }
-  // Register P as the last user of FoundPass or RequiredPass.
-  SmallVector<Pass *, 1> LU;
-  LU.push_back(FoundPass);
-  FPP->setLastUser(LU,  P);
-}
-
-/// Return function pass corresponding to PassInfo PI, that is
-/// required by module pass MP. Instantiate analysis pass, by using
-/// its runOnFunction() for function F.
-Pass* MPPassManager::getOnTheFlyPass(Pass *MP, AnalysisID PI, Function &F){
-  FunctionPassManagerImpl *FPP = OnTheFlyManagers[MP];
-  assert(FPP && "Unable to find on the fly pass");
-
-  FPP->releaseMemoryOnTheFly();
-  FPP->run(F);
-  return ((PMTopLevelManager*)FPP)->findAnalysisPass(PI);
-}
-
-
-//===----------------------------------------------------------------------===//
-// PassManagerImpl implementation
-
-//
-/// run - Execute all of the passes scheduled for execution.  Keep track of
-/// whether any of the passes modifies the module, and if so, return true.
-bool PassManagerImpl::run(Module &M) {
-  bool Changed = false;
-
-  dumpArguments();
-  dumpPasses();
-
-  for (ImmutablePass *ImPass : getImmutablePasses())
-    Changed |= ImPass->doInitialization(M);
-
-  initializeAllAnalysisInfo();
-  for (unsigned Index = 0; Index < getNumContainedManagers(); ++Index) {
-    Changed |= getContainedManager(Index)->runOnModule(M);
-    M.getContext().yield();
-  }
-
-  for (ImmutablePass *ImPass : getImmutablePasses())
-    Changed |= ImPass->doFinalization(M);
-
-  return Changed;
-}
-
-//===----------------------------------------------------------------------===//
-// PassManager implementation
-
-/// Create new pass manager
-PassManager::PassManager() {
-  PM = new PassManagerImpl();
-  // PM is the top level manager
-  PM->setTopLevelManager(PM);
-}
-
-PassManager::~PassManager() {
-  delete PM;
-}
-
-void PassManager::add(Pass *P) {
-  PM->add(P);
-}
-
-/// run - Execute all of the passes scheduled for execution.  Keep track of
-/// whether any of the passes modifies the module, and if so, return true.
-bool PassManager::run(Module &M) {
-  return PM->run(M);
-}
-
-//===----------------------------------------------------------------------===//
-// PMStack implementation
-//
-
-// Pop Pass Manager from the stack and clear its analysis info.
-void PMStack::pop() {
-
-  PMDataManager *Top = this->top();
-  Top->initializeAnalysisInfo();
-
-  S.pop_back();
-}
-
-// Push PM on the stack and set its top level manager.
-void PMStack::push(PMDataManager *PM) {
-  assert(PM && "Unable to push. Pass Manager expected");
-  assert(PM->getDepth()==0 && "Pass Manager depth set too early");
-
-  if (!this->empty()) {
-    assert(PM->getPassManagerType() > this->top()->getPassManagerType()
-           && "pushing bad pass manager to PMStack");
-    PMTopLevelManager *TPM = this->top()->getTopLevelManager();
-
-    assert(TPM && "Unable to find top level manager");
-    TPM->addIndirectPassManager(PM);
-    PM->setTopLevelManager(TPM);
-    PM->setDepth(this->top()->getDepth()+1);
-  } else {
-    assert((PM->getPassManagerType() == PMT_ModulePassManager
-           || PM->getPassManagerType() == PMT_FunctionPassManager)
-           && "pushing bad pass manager to PMStack");
-    PM->setDepth(1);
-  }
-
-  S.push_back(PM);
-}
-
-// Dump content of the pass manager stack.
-LLVM_DUMP_METHOD void PMStack::dump() const {
-  for (PMDataManager *Manager : S)
-    dbgs() << Manager->getAsPass()->getPassName() << ' ';
-
-  if (!S.empty())
-    dbgs() << '\n';
-}
-
-/// Find appropriate Module Pass Manager in the PM Stack and
-/// add self into that manager.
-void ModulePass::assignPassManager(PMStack &PMS,
-                                   PassManagerType PreferredType) {
-  // Find Module Pass Manager
-  while (!PMS.empty()) {
-    PassManagerType TopPMType = PMS.top()->getPassManagerType();
-    if (TopPMType == PreferredType)
-      break; // We found desired pass manager
-    else if (TopPMType > PMT_ModulePassManager)
-      PMS.pop();    // Pop children pass managers
-    else
-      break;
-  }
-  assert(!PMS.empty() && "Unable to find appropriate Pass Manager");
-  PMS.top()->add(this);
-}
-
-/// Find appropriate Function Pass Manager or Call Graph Pass Manager
-/// in the PM Stack and add self into that manager.
-void FunctionPass::assignPassManager(PMStack &PMS,
-                                     PassManagerType PreferredType) {
-
-  // Find Function Pass Manager
-  while (!PMS.empty()) {
-    if (PMS.top()->getPassManagerType() > PMT_FunctionPassManager)
-      PMS.pop();
-    else
-      break;
-  }
-
-  // Create new Function Pass Manager if needed.
-  FPPassManager *FPP;
-  if (PMS.top()->getPassManagerType() == PMT_FunctionPassManager) {
-    FPP = (FPPassManager *)PMS.top();
-  } else {
-    assert(!PMS.empty() && "Unable to create Function Pass Manager");
-    PMDataManager *PMD = PMS.top();
-
-    // [1] Create new Function Pass Manager
-    FPP = new FPPassManager();
-    FPP->populateInheritedAnalysis(PMS);
-
-    // [2] Set up new manager's top level manager
-    PMTopLevelManager *TPM = PMD->getTopLevelManager();
-    TPM->addIndirectPassManager(FPP);
-
-    // [3] Assign manager to manage this new manager. This may create
-    // and push new managers into PMS
-    FPP->assignPassManager(PMS, PMD->getPassManagerType());
-
-    // [4] Push new manager into PMS
-    PMS.push(FPP);
-  }
-
-  // Assign FPP as the manager of this pass.
-  FPP->add(this);
-}
-
-/// Find appropriate Basic Pass Manager or Call Graph Pass Manager
-/// in the PM Stack and add self into that manager.
-void BasicBlockPass::assignPassManager(PMStack &PMS,
-                                       PassManagerType PreferredType) {
-  BBPassManager *BBP;
-
-  // Basic Pass Manager is a leaf pass manager. It does not handle
-  // any other pass manager.
-  if (!PMS.empty() &&
-      PMS.top()->getPassManagerType() == PMT_BasicBlockPassManager) {
-    BBP = (BBPassManager *)PMS.top();
-  } else {
-    // If leaf manager is not Basic Block Pass manager then create new
-    // basic Block Pass manager.
-    assert(!PMS.empty() && "Unable to create BasicBlock Pass Manager");
-    PMDataManager *PMD = PMS.top();
-
-    // [1] Create new Basic Block Manager
-    BBP = new BBPassManager();
-
-    // [2] Set up new manager's top level manager
-    // Basic Block Pass Manager does not live by itself
-    PMTopLevelManager *TPM = PMD->getTopLevelManager();
-    TPM->addIndirectPassManager(BBP);
-
-    // [3] Assign manager to manage this new manager. This may create
-    // and push new managers into PMS
-    BBP->assignPassManager(PMS, PreferredType);
-
-    // [4] Push new manager into PMS
-    PMS.push(BBP);
-  }
-
-  // Assign BBP as the manager of this pass.
-  BBP->add(this);
-}
-
-PassManagerBase::~PassManagerBase() {}