X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=lib%2FCodeGen%2FAsmPrinter%2FAsmPrinter.cpp;h=fabae38950f25e6bbc2272d17e5d4f711935caff;hp=14ee0159550934dae73738908a76c62db753c01c;hb=7673d242f73b19a7f5f011c9a1679f46ddf8de2a;hpb=2a9bbcbbadd5ba2eac950e1717c456298ec12bb6

diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 14ee0159550..fabae38950f 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -14,12 +14,11 @@
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "DwarfDebug.h"
 #include "DwarfException.h"
-#include "Win64Exception.h"
+#include "WinException.h"
 #include "WinCodeViewLineTables.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Analysis/ConstantFolding.h"
-#include "llvm/Analysis/JumpInstrTableInfo.h"
 #include "llvm/CodeGen/Analysis.h"
 #include "llvm/CodeGen/GCMetadataPrinter.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
@@ -28,7 +27,7 @@
 #include "llvm/CodeGen/MachineInstrBundle.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/CodeGen/MachineLoopInfo.h"
-#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineModuleInfoImpls.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/DebugInfo.h"
 #include "llvm/IR/Mangler.h"
@@ -40,7 +39,7 @@
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCStreamer.h"
-#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCSymbolELF.h"
 #include "llvm/MC/MCValue.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Format.h"
@@ -102,7 +101,7 @@ static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &DL,
 
 AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
     : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
-      OutContext(Streamer->getContext()), OutStreamer(*Streamer.release()),
+      OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)),
       LastMI(nullptr), LastFn(0), Counter(~0U) {
   DD = nullptr;
   MMI = nullptr;
@@ -112,7 +111,7 @@ AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
   CurrentFnBegin = nullptr;
   CurrentFnEnd = nullptr;
   GCMetadataPrinters = nullptr;
-  VerboseAsm = OutStreamer.isVerboseAsm();
+  VerboseAsm = OutStreamer->isVerboseAsm();
 }
 
 AsmPrinter::~AsmPrinter() {
@@ -124,8 +123,6 @@ AsmPrinter::~AsmPrinter() {
     delete &GCMap;
     GCMetadataPrinters = nullptr;
   }
-
-  delete &OutStreamer;
 }
 
 /// getFunctionNumber - Return a unique ID for the current function.
@@ -138,11 +135,14 @@ const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
   return *TM.getObjFileLowering();
 }
 
-/// getDataLayout - Return information about data layout.
 const DataLayout &AsmPrinter::getDataLayout() const {
-  return *TM.getDataLayout();
+  return MMI->getModule()->getDataLayout();
 }
 
+// Do not use the cached DataLayout because some client use it without a Module
+// (llmv-dsymutil, llvm-dwarfdump).
+unsigned AsmPrinter::getPointerSize() const { return TM.getPointerSize(); }
+
 const MCSubtargetInfo &AsmPrinter::getSubtargetInfo() const {
   assert(MF && "getSubtargetInfo requires a valid MachineFunction!");
   return MF->getSubtarget<MCSubtargetInfo>();
@@ -153,12 +153,12 @@ void AsmPrinter::EmitToStreamer(MCStreamer &S, const MCInst &Inst) {
 }
 
 StringRef AsmPrinter::getTargetTriple() const {
-  return TM.getTargetTriple();
+  return TM.getTargetTriple().str();
 }
 
 /// getCurrentSection() - Return the current section we are emitting to.
 const MCSection *AsmPrinter::getCurrentSection() const {
-  return OutStreamer.getCurrentSection().first;
+  return OutStreamer->getCurrentSection().first;
 }
 
 
@@ -174,15 +174,14 @@ void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
 
 bool AsmPrinter::doInitialization(Module &M) {
   MMI = getAnalysisIfAvailable<MachineModuleInfo>();
-  MMI->AnalyzeModule(M);
 
   // Initialize TargetLoweringObjectFile.
   const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
     .Initialize(OutContext, TM);
 
-  OutStreamer.InitSections(false);
+  OutStreamer->InitSections(false);
 
-  Mang = new Mangler(TM.getDataLayout());
+  Mang = new Mangler();
 
   // Emit the version-min deplyment target directive if needed.
   //
@@ -197,10 +196,18 @@ bool AsmPrinter::doInitialization(Module &M) {
     unsigned Major, Minor, Update;
     TT.getOSVersion(Major, Minor, Update);
     // If there is a version specified, Major will be non-zero.
-    if (Major)
-      OutStreamer.EmitVersionMin((TT.isMacOSX() ?
-                                  MCVM_OSXVersionMin : MCVM_IOSVersionMin),
-                                 Major, Minor, Update);
+    if (Major) {
+      MCVersionMinType VersionType;
+      if (TT.isWatchOS())
+        VersionType = MCVM_WatchOSVersionMin;
+      else if (TT.isTvOS())
+        VersionType = MCVM_TvOSVersionMin;
+      else if (TT.isMacOSX())
+        VersionType = MCVM_OSXVersionMin;
+      else
+        VersionType = MCVM_IOSVersionMin;
+      OutStreamer->EmitVersionMin(VersionType, Major, Minor, Update);
+    }
   }
 
   // Allow the target to emit any magic that it wants at the start of the file.
@@ -210,7 +217,7 @@ bool AsmPrinter::doInitialization(Module &M) {
   // don't, this at least helps the user find where a global came from.
   if (MAI->hasSingleParameterDotFile()) {
     // .file "foo.c"
-    OutStreamer.EmitFileDirective(M.getModuleIdentifier());
+    OutStreamer->EmitFileDirective(M.getModuleIdentifier());
   }
 
   GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
@@ -224,31 +231,24 @@ bool AsmPrinter::doInitialization(Module &M) {
     // We're at the module level. Construct MCSubtarget from the default CPU
     // and target triple.
     std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
-        TM.getTargetTriple(), TM.getTargetCPU(), TM.getTargetFeatureString()));
-    OutStreamer.AddComment("Start of file scope inline assembly");
-    OutStreamer.AddBlankLine();
-    EmitInlineAsm(M.getModuleInlineAsm()+"\n", *STI);
-    OutStreamer.AddComment("End of file scope inline assembly");
-    OutStreamer.AddBlankLine();
+        TM.getTargetTriple().str(), TM.getTargetCPU(),
+        TM.getTargetFeatureString()));
+    OutStreamer->AddComment("Start of file scope inline assembly");
+    OutStreamer->AddBlankLine();
+    EmitInlineAsm(M.getModuleInlineAsm()+"\n",
+                  OutContext.getSubtargetCopy(*STI), TM.Options.MCOptions);
+    OutStreamer->AddComment("End of file scope inline assembly");
+    OutStreamer->AddBlankLine();
   }
 
   if (MAI->doesSupportDebugInformation()) {
-    bool skip_dwarf = false;
-    if (Triple(TM.getTargetTriple()).isKnownWindowsMSVCEnvironment()) {
+    bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
+    if (EmitCodeView && TM.getTargetTriple().isKnownWindowsMSVCEnvironment()) {
       Handlers.push_back(HandlerInfo(new WinCodeViewLineTables(this),
                                      DbgTimerName,
                                      CodeViewLineTablesGroupName));
-      // FIXME: Don't emit DWARF debug info if there's at least one function
-      // with AddressSanitizer instrumentation.
-      // This is a band-aid fix for PR22032.
-      for (auto &F : M.functions()) {
-        if (F.hasFnAttribute(Attribute::SanitizeAddress)) {
-          skip_dwarf = true;
-          break;
-        }
-      }
     }
-    if (!skip_dwarf) {
+    if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
       DD = new DwarfDebug(this, &M);
       Handlers.push_back(HandlerInfo(DD, DbgTimerName, DWARFGroupName));
     }
@@ -268,8 +268,11 @@ bool AsmPrinter::doInitialization(Module &M) {
   case ExceptionHandling::WinEH:
     switch (MAI->getWinEHEncodingType()) {
     default: llvm_unreachable("unsupported unwinding information encoding");
+    case WinEH::EncodingType::Invalid:
+      break;
+    case WinEH::EncodingType::X86:
     case WinEH::EncodingType::Itanium:
-      ES = new Win64Exception(this);
+      ES = new WinException(this);
       break;
     }
     break;
@@ -296,20 +299,20 @@ void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
   case GlobalValue::WeakODRLinkage:
     if (MAI->hasWeakDefDirective()) {
       // .globl _foo
-      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
+      OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
 
       if (!canBeHidden(GV, *MAI))
         // .weak_definition _foo
-        OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
+        OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
       else
-        OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
+        OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
     } else if (MAI->hasLinkOnceDirective()) {
       // .globl _foo
-      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
+      OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
       //NOTE: linkonce is handled by the section the symbol was assigned to.
     } else {
       // .weak _foo
-      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
+      OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
     }
     return;
   case GlobalValue::AppendingLinkage:
@@ -318,7 +321,7 @@ void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
   case GlobalValue::ExternalLinkage:
     // If external or appending, declare as a global symbol.
     // .globl _foo
-    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
+    OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
     return;
   case GlobalValue::PrivateLinkage:
   case GlobalValue::InternalLinkage:
@@ -340,8 +343,56 @@ MCSymbol *AsmPrinter::getSymbol(const GlobalValue *GV) const {
   return TM.getSymbol(GV, *Mang);
 }
 
+static MCSymbol *getOrCreateEmuTLSControlSym(MCSymbol *GVSym, MCContext &C) {
+  return C.getOrCreateSymbol(Twine("__emutls_v.") + GVSym->getName());
+}
+
+static MCSymbol *getOrCreateEmuTLSInitSym(MCSymbol *GVSym, MCContext &C) {
+  return C.getOrCreateSymbol(Twine("__emutls_t.") + GVSym->getName());
+}
+
+/// EmitEmulatedTLSControlVariable - Emit the control variable for an emulated TLS variable.
+void AsmPrinter::EmitEmulatedTLSControlVariable(const GlobalVariable *GV,
+                                                MCSymbol *EmittedSym,
+                                                bool AllZeroInitValue) {
+  // If there is init value, use .data.rel.local section;
+  // otherwise use the .data section.
+  MCSection *TLSVarSection =
+      const_cast<MCSection *>((GV->hasInitializer() && !AllZeroInitValue)
+                                  ? getObjFileLowering().getDataRelSection()
+                                  : getObjFileLowering().getDataSection());
+  OutStreamer->SwitchSection(TLSVarSection);
+  MCSymbol *GVSym = getSymbol(GV);
+  EmitLinkage(GV, EmittedSym);  // same linkage as GV
+  const DataLayout &DL = GV->getParent()->getDataLayout();
+  uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
+  unsigned AlignLog = getGVAlignmentLog2(GV, DL);
+  unsigned WordSize = DL.getPointerSize();
+  unsigned Alignment = DL.getPointerABIAlignment();
+  EmitAlignment(Log2_32(Alignment));
+  OutStreamer->EmitLabel(EmittedSym);
+  OutStreamer->EmitIntValue(Size, WordSize);
+  OutStreamer->EmitIntValue((1 << AlignLog), WordSize);
+  OutStreamer->EmitIntValue(0, WordSize);
+  if (GV->hasInitializer() && !AllZeroInitValue) {
+    OutStreamer->EmitSymbolValue(
+        getOrCreateEmuTLSInitSym(GVSym, OutContext), WordSize);
+  } else
+    OutStreamer->EmitIntValue(0, WordSize);
+  if (MAI->hasDotTypeDotSizeDirective())
+    OutStreamer->emitELFSize(cast<MCSymbolELF>(EmittedSym),
+                             MCConstantExpr::create(4 * WordSize, OutContext));
+  OutStreamer->AddBlankLine();  // End of the __emutls_v.* variable.
+}
+
 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
+  bool IsEmuTLSVar =
+      GV->getThreadLocalMode() != llvm::GlobalVariable::NotThreadLocal &&
+      TM.Options.EmulatedTLS;
+  assert(!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
+         "No emulated TLS variables in the common section");
+
   if (GV->hasInitializer()) {
     // Check to see if this is a special global used by LLVM, if so, emit it.
     if (EmitSpecialLLVMGlobal(GV))
@@ -352,15 +403,22 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
     if (GlobalGOTEquivs.count(getSymbol(GV)))
       return;
 
-    if (isVerbose()) {
-      GV->printAsOperand(OutStreamer.GetCommentOS(),
+    if (isVerbose() && !IsEmuTLSVar) {
+      // When printing the control variable __emutls_v.*,
+      // we don't need to print the original TLS variable name.
+      GV->printAsOperand(OutStreamer->GetCommentOS(),
                      /*PrintType=*/false, GV->getParent());
-      OutStreamer.GetCommentOS() << '\n';
+      OutStreamer->GetCommentOS() << '\n';
     }
   }
 
   MCSymbol *GVSym = getSymbol(GV);
-  EmitVisibility(GVSym, GV->getVisibility(), !GV->isDeclaration());
+  MCSymbol *EmittedSym = IsEmuTLSVar ?
+      getOrCreateEmuTLSControlSym(GVSym, OutContext) : GVSym;
+  // getOrCreateEmuTLSControlSym only creates the symbol with name and default attributes.
+  // GV's or GVSym's attributes will be used for the EmittedSym.
+
+  EmitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
 
   if (!GV->hasInitializer())   // External globals require no extra code.
     return;
@@ -371,17 +429,29 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
                        "' is already defined");
 
   if (MAI->hasDotTypeDotSizeDirective())
-    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
+    OutStreamer->EmitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
 
   SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
 
-  const DataLayout *DL = TM.getDataLayout();
-  uint64_t Size = DL->getTypeAllocSize(GV->getType()->getElementType());
+  const DataLayout &DL = GV->getParent()->getDataLayout();
+  uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
 
   // If the alignment is specified, we *must* obey it.  Overaligning a global
   // with a specified alignment is a prompt way to break globals emitted to
   // sections and expected to be contiguous (e.g. ObjC metadata).
-  unsigned AlignLog = getGVAlignmentLog2(GV, *DL);
+  unsigned AlignLog = getGVAlignmentLog2(GV, DL);
+
+  bool AllZeroInitValue = false;
+  const Constant *InitValue = GV->getInitializer();
+  if (isa<ConstantAggregateZero>(InitValue))
+    AllZeroInitValue = true;
+  else {
+    const ConstantInt *InitIntValue = dyn_cast<ConstantInt>(InitValue);
+    if (InitIntValue && InitIntValue->isZero())
+      AllZeroInitValue = true;
+  }
+  if (IsEmuTLSVar)
+    EmitEmulatedTLSControlVariable(GV, EmittedSym, AllZeroInitValue);
 
   for (const HandlerInfo &HI : Handlers) {
     NamedRegionTimer T(HI.TimerName, HI.TimerGroupName, TimePassesIsEnabled);
@@ -390,6 +460,8 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
 
   // Handle common and BSS local symbols (.lcomm).
   if (GVKind.isCommon() || GVKind.isBSSLocal()) {
+    assert(!(IsEmuTLSVar && GVKind.isCommon()) &&
+           "No emulated TLS variables in the common section");
     if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
     unsigned Align = 1 << AlignLog;
 
@@ -399,16 +471,16 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
         Align = 0;
 
       // .comm _foo, 42, 4
-      OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
+      OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
       return;
     }
 
     // Handle local BSS symbols.
     if (MAI->hasMachoZeroFillDirective()) {
-      const MCSection *TheSection =
-        getObjFileLowering().SectionForGlobal(GV, GVKind, *Mang, TM);
+      MCSection *TheSection =
+          getObjFileLowering().SectionForGlobal(GV, GVKind, *Mang, TM);
       // .zerofill __DATA, __bss, _foo, 400, 5
-      OutStreamer.EmitZerofill(TheSection, GVSym, Size, Align);
+      OutStreamer->EmitZerofill(TheSection, GVSym, Size, Align);
       return;
     }
 
@@ -420,7 +492,7 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
     // Prefer to simply fall back to .local / .comm in this case.
     if (MAI->getLCOMMDirectiveAlignmentType() != LCOMM::NoAlignment) {
       // .lcomm _foo, 42
-      OutStreamer.EmitLocalCommonSymbol(GVSym, Size, Align);
+      OutStreamer->EmitLocalCommonSymbol(GVSym, Size, Align);
       return;
     }
 
@@ -428,24 +500,33 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
       Align = 0;
 
     // .local _foo
-    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
+    OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Local);
     // .comm _foo, 42, 4
-    OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
+    OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
     return;
   }
 
-  const MCSection *TheSection =
-    getObjFileLowering().SectionForGlobal(GV, GVKind, *Mang, TM);
+  if (IsEmuTLSVar && AllZeroInitValue)
+    return;  // No need of initialization values.
+
+  MCSymbol *EmittedInitSym = IsEmuTLSVar ?
+      getOrCreateEmuTLSInitSym(GVSym, OutContext) : GVSym;
+  // getOrCreateEmuTLSInitSym only creates the symbol with name and default attributes.
+  // GV's or GVSym's attributes will be used for the EmittedInitSym.
+
+  MCSection *TheSection = IsEmuTLSVar ?
+      getObjFileLowering().getReadOnlySection() :
+      getObjFileLowering().SectionForGlobal(GV, GVKind, *Mang, TM);
 
   // Handle the zerofill directive on darwin, which is a special form of BSS
   // emission.
-  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
+  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective() && !IsEmuTLSVar) {
     if (Size == 0) Size = 1;  // zerofill of 0 bytes is undefined.
 
     // .globl _foo
-    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
+    OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
     // .zerofill __DATA, __common, _foo, 400, 5
-    OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
+    OutStreamer->EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
     return;
   }
 
@@ -459,62 +540,65 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
   // TLOF class.  This will also make it more obvious that stuff like
   // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
   // specific code.
-  if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
+  if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective() && !IsEmuTLSVar) {
     // Emit the .tbss symbol
     MCSymbol *MangSym =
-      OutContext.GetOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
+      OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
 
     if (GVKind.isThreadBSS()) {
       TheSection = getObjFileLowering().getTLSBSSSection();
-      OutStreamer.EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
+      OutStreamer->EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
     } else if (GVKind.isThreadData()) {
-      OutStreamer.SwitchSection(TheSection);
+      OutStreamer->SwitchSection(TheSection);
 
       EmitAlignment(AlignLog, GV);
-      OutStreamer.EmitLabel(MangSym);
+      OutStreamer->EmitLabel(MangSym);
 
-      EmitGlobalConstant(GV->getInitializer());
+      EmitGlobalConstant(GV->getParent()->getDataLayout(),
+                         GV->getInitializer());
     }
 
-    OutStreamer.AddBlankLine();
+    OutStreamer->AddBlankLine();
 
     // Emit the variable struct for the runtime.
-    const MCSection *TLVSect
-      = getObjFileLowering().getTLSExtraDataSection();
+    MCSection *TLVSect = getObjFileLowering().getTLSExtraDataSection();
 
-    OutStreamer.SwitchSection(TLVSect);
+    OutStreamer->SwitchSection(TLVSect);
     // Emit the linkage here.
     EmitLinkage(GV, GVSym);
-    OutStreamer.EmitLabel(GVSym);
+    OutStreamer->EmitLabel(GVSym);
 
     // Three pointers in size:
     //   - __tlv_bootstrap - used to make sure support exists
     //   - spare pointer, used when mapped by the runtime
     //   - pointer to mangled symbol above with initializer
-    unsigned PtrSize = DL->getPointerTypeSize(GV->getType());
-    OutStreamer.EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
+    unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
+    OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
                                 PtrSize);
-    OutStreamer.EmitIntValue(0, PtrSize);
-    OutStreamer.EmitSymbolValue(MangSym, PtrSize);
+    OutStreamer->EmitIntValue(0, PtrSize);
+    OutStreamer->EmitSymbolValue(MangSym, PtrSize);
 
-    OutStreamer.AddBlankLine();
+    OutStreamer->AddBlankLine();
     return;
   }
 
-  OutStreamer.SwitchSection(TheSection);
+  OutStreamer->SwitchSection(TheSection);
 
-  EmitLinkage(GV, GVSym);
+  // emutls_t.* symbols are only used in the current compilation unit.
+  if (!IsEmuTLSVar)
+    EmitLinkage(GV, EmittedInitSym);
   EmitAlignment(AlignLog, GV);
 
-  OutStreamer.EmitLabel(GVSym);
+  OutStreamer->EmitLabel(EmittedInitSym);
 
-  EmitGlobalConstant(GV->getInitializer());
+  EmitGlobalConstant(GV->getParent()->getDataLayout(), GV->getInitializer());
 
   if (MAI->hasDotTypeDotSizeDirective())
     // .size foo, 42
-    OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
+    OutStreamer->emitELFSize(cast<MCSymbolELF>(EmittedInitSym),
+                             MCConstantExpr::create(Size, OutContext));
 
-  OutStreamer.AddBlankLine();
+  OutStreamer->AddBlankLine();
 }
 
 /// EmitFunctionHeader - This method emits the header for the current
@@ -526,7 +610,7 @@ void AsmPrinter::EmitFunctionHeader() {
   // Print the 'header' of function.
   const Function *F = MF->getFunction();
 
-  OutStreamer.SwitchSection(
+  OutStreamer->SwitchSection(
       getObjFileLowering().SectionForGlobal(F, *Mang, TM));
   EmitVisibility(CurrentFnSym, F->getVisibility());
 
@@ -535,17 +619,17 @@ void AsmPrinter::EmitFunctionHeader() {
     EmitAlignment(MF->getAlignment(), F);
 
   if (MAI->hasDotTypeDotSizeDirective())
-    OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
+    OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
 
   if (isVerbose()) {
-    F->printAsOperand(OutStreamer.GetCommentOS(),
+    F->printAsOperand(OutStreamer->GetCommentOS(),
                    /*PrintType=*/false, F->getParent());
-    OutStreamer.GetCommentOS() << '\n';
+    OutStreamer->GetCommentOS() << '\n';
   }
 
   // Emit the prefix data.
   if (F->hasPrefixData())
-    EmitGlobalConstant(F->getPrefixData());
+    EmitGlobalConstant(F->getParent()->getDataLayout(), F->getPrefixData());
 
   // Emit the CurrentFnSym.  This is a virtual function to allow targets to
   // do their wild and crazy things as required.
@@ -557,18 +641,18 @@ void AsmPrinter::EmitFunctionHeader() {
   std::vector<MCSymbol*> DeadBlockSyms;
   MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
   for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
-    OutStreamer.AddComment("Address taken block that was later removed");
-    OutStreamer.EmitLabel(DeadBlockSyms[i]);
+    OutStreamer->AddComment("Address taken block that was later removed");
+    OutStreamer->EmitLabel(DeadBlockSyms[i]);
   }
 
   if (CurrentFnBegin) {
     if (MAI->useAssignmentForEHBegin()) {
-      MCSymbol *CurPos = OutContext.CreateTempSymbol();
-      OutStreamer.EmitLabel(CurPos);
-      OutStreamer.EmitAssignment(CurrentFnBegin,
-                                 MCSymbolRefExpr::Create(CurPos, OutContext));
+      MCSymbol *CurPos = OutContext.createTempSymbol();
+      OutStreamer->EmitLabel(CurPos);
+      OutStreamer->EmitAssignment(CurrentFnBegin,
+                                 MCSymbolRefExpr::create(CurPos, OutContext));
     } else {
-      OutStreamer.EmitLabel(CurrentFnBegin);
+      OutStreamer->EmitLabel(CurrentFnBegin);
     }
   }
 
@@ -580,7 +664,7 @@ void AsmPrinter::EmitFunctionHeader() {
 
   // Emit the prologue data.
   if (F->hasPrologueData())
-    EmitGlobalConstant(F->getPrologueData());
+    EmitGlobalConstant(F->getParent()->getDataLayout(), F->getPrologueData());
 }
 
 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
@@ -597,7 +681,7 @@ void AsmPrinter::EmitFunctionEntryLabel() {
     report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
                        "' label emitted multiple times to assembly file");
 
-  return OutStreamer.EmitLabel(CurrentFnSym);
+  return OutStreamer->EmitLabel(CurrentFnSym);
 }
 
 /// emitComments - Pretty-print comments for instructions.
@@ -640,22 +724,30 @@ static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
 /// that is an implicit def.
 void AsmPrinter::emitImplicitDef(const MachineInstr *MI) const {
   unsigned RegNo = MI->getOperand(0).getReg();
-  OutStreamer.AddComment(Twine("implicit-def: ") +
-                         MMI->getContext().getRegisterInfo()->getName(RegNo));
-  OutStreamer.AddBlankLine();
+
+  SmallString<128> Str;
+  raw_svector_ostream OS(Str);
+  OS << "implicit-def: "
+     << PrintReg(RegNo, MF->getSubtarget().getRegisterInfo());
+
+  OutStreamer->AddComment(OS.str());
+  OutStreamer->AddBlankLine();
 }
 
 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
-  std::string Str = "kill:";
+  std::string Str;
+  raw_string_ostream OS(Str);
+  OS << "kill:";
   for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
     const MachineOperand &Op = MI->getOperand(i);
     assert(Op.isReg() && "KILL instruction must have only register operands");
-    Str += ' ';
-    Str += AP.MMI->getContext().getRegisterInfo()->getName(Op.getReg());
-    Str += (Op.isDef() ? "<def>" : "<kill>");
+    OS << ' '
+       << PrintReg(Op.getReg(),
+                   AP.MF->getSubtarget().getRegisterInfo())
+       << (Op.isDef() ? "<def>" : "<kill>");
   }
-  AP.OutStreamer.AddComment(Str);
-  AP.OutStreamer.AddBlankLine();
+  AP.OutStreamer->AddComment(Str);
+  AP.OutStreamer->AddBlankLine();
 }
 
 /// emitDebugValueComment - This method handles the target-independent form
@@ -670,18 +762,18 @@ static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
   raw_svector_ostream OS(Str);
   OS << "DEBUG_VALUE: ";
 
-  DIVariable V = MI->getDebugVariable();
-  if (V.getContext().isSubprogram()) {
-    StringRef Name = DISubprogram(V.getContext()).getDisplayName();
+  const DILocalVariable *V = MI->getDebugVariable();
+  if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
+    StringRef Name = SP->getDisplayName();
     if (!Name.empty())
       OS << Name << ":";
   }
-  OS << V.getName();
+  OS << V->getName();
 
-  DIExpression Expr = MI->getDebugExpression();
-  if (Expr.isBitPiece())
-    OS << " [bit_piece offset=" << Expr.getBitPieceOffset()
-       << " size=" << Expr.getBitPieceSize() << "]";
+  const DIExpression *Expr = MI->getDebugExpression();
+  if (Expr->isBitPiece())
+    OS << " [bit_piece offset=" << Expr->getBitPieceOffset()
+       << " size=" << Expr->getBitPieceSize() << "]";
   OS << " <- ";
 
   // The second operand is only an offset if it's an immediate.
@@ -722,19 +814,19 @@ static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
       // Suppress offset, it is not meaningful here.
       OS << "undef";
       // NOTE: Want this comment at start of line, don't emit with AddComment.
-      AP.OutStreamer.emitRawComment(OS.str());
+      AP.OutStreamer->emitRawComment(OS.str());
       return true;
     }
     if (Deref)
       OS << '[';
-    OS << AP.MMI->getContext().getRegisterInfo()->getName(Reg);
+    OS << PrintReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
   }
 
   if (Deref)
     OS << '+' << Offset << ']';
 
   // NOTE: Want this comment at start of line, don't emit with AddComment.
-  AP.OutStreamer.emitRawComment(OS.str());
+  AP.OutStreamer->emitRawComment(OS.str());
   return true;
 }
 
@@ -775,8 +867,8 @@ void AsmPrinter::emitFrameAlloc(const MachineInstr &MI) {
   int FrameOffset = MI.getOperand(1).getImm();
 
   // Emit a symbol assignment.
-  OutStreamer.EmitAssignment(FrameAllocSym,
-                             MCConstantExpr::Create(FrameOffset, OutContext));
+  OutStreamer->EmitAssignment(FrameAllocSym,
+                             MCConstantExpr::create(FrameOffset, OutContext));
 }
 
 /// EmitFunctionBody - This method emits the body and trailer for a
@@ -812,20 +904,20 @@ void AsmPrinter::EmitFunctionBody() {
       }
 
       if (isVerbose())
-        emitComments(MI, OutStreamer.GetCommentOS());
+        emitComments(MI, OutStreamer->GetCommentOS());
 
       switch (MI.getOpcode()) {
       case TargetOpcode::CFI_INSTRUCTION:
         emitCFIInstruction(MI);
         break;
 
-      case TargetOpcode::FRAME_ALLOC:
+      case TargetOpcode::LOCAL_ESCAPE:
         emitFrameAlloc(MI);
         break;
 
       case TargetOpcode::EH_LABEL:
       case TargetOpcode::GC_LABEL:
-        OutStreamer.EmitLabel(MI.getOperand(0).getMCSymbol());
+        OutStreamer->EmitLabel(MI.getOperand(0).getMCSymbol());
         break;
       case TargetOpcode::INLINEASM:
         EmitInlineAsm(&MI);
@@ -865,12 +957,12 @@ void AsmPrinter::EmitFunctionBody() {
   if ((MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode)) {
     MCInst Noop;
     MF->getSubtarget().getInstrInfo()->getNoopForMachoTarget(Noop);
-    OutStreamer.AddComment("avoids zero-length function");
+    OutStreamer->AddComment("avoids zero-length function");
 
     // Targets can opt-out of emitting the noop here by leaving the opcode
     // unspecified.
     if (Noop.getOpcode())
-      OutStreamer.EmitInstruction(Noop, getSubtargetInfo());
+      OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
   }
 
   const Function *F = MF->getFunction();
@@ -880,18 +972,18 @@ void AsmPrinter::EmitFunctionBody() {
     MCSymbol *Sym = GetBlockAddressSymbol(&BB);
     if (Sym->isDefined())
       continue;
-    OutStreamer.AddComment("Address of block that was removed by CodeGen");
-    OutStreamer.EmitLabel(Sym);
+    OutStreamer->AddComment("Address of block that was removed by CodeGen");
+    OutStreamer->EmitLabel(Sym);
   }
 
   // Emit target-specific gunk after the function body.
   EmitFunctionBodyEnd();
 
   if (!MMI->getLandingPads().empty() || MMI->hasDebugInfo() ||
-      MAI->hasDotTypeDotSizeDirective()) {
+      MMI->hasEHFunclets() || MAI->hasDotTypeDotSizeDirective()) {
     // Create a symbol for the end of function.
     CurrentFnEnd = createTempSymbol("func_end");
-    OutStreamer.EmitLabel(CurrentFnEnd);
+    OutStreamer->EmitLabel(CurrentFnEnd);
   }
 
   // If the target wants a .size directive for the size of the function, emit
@@ -899,12 +991,11 @@ void AsmPrinter::EmitFunctionBody() {
   if (MAI->hasDotTypeDotSizeDirective()) {
     // We can get the size as difference between the function label and the
     // temp label.
-    const MCExpr *SizeExp =
-      MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(CurrentFnEnd, OutContext),
-                              MCSymbolRefExpr::Create(CurrentFnSymForSize,
-                                                      OutContext),
-                              OutContext);
-    OutStreamer.EmitELFSize(CurrentFnSym, SizeExp);
+    const MCExpr *SizeExp = MCBinaryExpr::createSub(
+        MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
+        MCSymbolRefExpr::create(CurrentFnSymForSize, OutContext), OutContext);
+    if (auto Sym = dyn_cast<MCSymbolELF>(CurrentFnSym))
+      OutStreamer->emitELFSize(Sym, SizeExp);
   }
 
   for (const HandlerInfo &HI : Handlers) {
@@ -922,7 +1013,7 @@ void AsmPrinter::EmitFunctionBody() {
   }
   MMI->EndFunction();
 
-  OutStreamer.AddBlankLine();
+  OutStreamer->AddBlankLine();
 }
 
 /// \brief Compute the number of Global Variables that uses a Constant.
@@ -1024,7 +1115,7 @@ bool AsmPrinter::doFinalization(Module &M) {
 
   // Emit visibility info for declarations
   for (const Function &F : M) {
-    if (!F.isDeclaration())
+    if (!F.isDeclarationForLinker())
       continue;
     GlobalValue::VisibilityTypes V = F.getVisibility();
     if (V == GlobalValue::DefaultVisibility)
@@ -1034,14 +1125,30 @@ bool AsmPrinter::doFinalization(Module &M) {
     EmitVisibility(Name, V, false);
   }
 
+  const TargetLoweringObjectFile &TLOF = getObjFileLowering();
+
   // Emit module flags.
   SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
   M.getModuleFlagsMetadata(ModuleFlags);
   if (!ModuleFlags.empty())
-    getObjFileLowering().emitModuleFlags(OutStreamer, ModuleFlags, *Mang, TM);
+    TLOF.emitModuleFlags(*OutStreamer, ModuleFlags, *Mang, TM);
+
+  if (TM.getTargetTriple().isOSBinFormatELF()) {
+    MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
 
-  // Make sure we wrote out everything we need.
-  OutStreamer.Flush();
+    // Output stubs for external and common global variables.
+    MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
+    if (!Stubs.empty()) {
+      OutStreamer->SwitchSection(TLOF.getDataRelSection());
+      const DataLayout &DL = M.getDataLayout();
+
+      for (const auto &Stub : Stubs) {
+        OutStreamer->EmitLabel(Stub.first);
+        OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
+                                     DL.getPointerSize());
+      }
+    }
+  }
 
   // Finalize debug and EH information.
   for (const HandlerInfo &HI : Handlers) {
@@ -1064,31 +1171,45 @@ bool AsmPrinter::doFinalization(Module &M) {
     for (const auto &G : M.globals()) {
       if (!G.hasExternalWeakLinkage())
         continue;
-      OutStreamer.EmitSymbolAttribute(getSymbol(&G), MCSA_WeakReference);
+      OutStreamer->EmitSymbolAttribute(getSymbol(&G), MCSA_WeakReference);
     }
 
     for (const auto &F : M) {
       if (!F.hasExternalWeakLinkage())
         continue;
-      OutStreamer.EmitSymbolAttribute(getSymbol(&F), MCSA_WeakReference);
+      OutStreamer->EmitSymbolAttribute(getSymbol(&F), MCSA_WeakReference);
     }
   }
 
-  OutStreamer.AddBlankLine();
+  OutStreamer->AddBlankLine();
   for (const auto &Alias : M.aliases()) {
     MCSymbol *Name = getSymbol(&Alias);
 
     if (Alias.hasExternalLinkage() || !MAI->getWeakRefDirective())
-      OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
+      OutStreamer->EmitSymbolAttribute(Name, MCSA_Global);
     else if (Alias.hasWeakLinkage() || Alias.hasLinkOnceLinkage())
-      OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
+      OutStreamer->EmitSymbolAttribute(Name, MCSA_WeakReference);
     else
       assert(Alias.hasLocalLinkage() && "Invalid alias linkage");
 
     EmitVisibility(Name, Alias.getVisibility());
 
     // Emit the directives as assignments aka .set:
-    OutStreamer.EmitAssignment(Name, lowerConstant(Alias.getAliasee()));
+    OutStreamer->EmitAssignment(Name, lowerConstant(Alias.getAliasee()));
+
+    // If the aliasee does not correspond to a symbol in the output, i.e. the
+    // alias is not of an object or the aliased object is private, then set the
+    // size of the alias symbol from the type of the alias. We don't do this in
+    // other situations as the alias and aliasee having differing types but same
+    // size may be intentional.
+    const GlobalObject *BaseObject = Alias.getBaseObject();
+    if (MAI->hasDotTypeDotSizeDirective() && Alias.getValueType()->isSized() &&
+        (!BaseObject || BaseObject->hasPrivateLinkage())) {
+      const DataLayout &DL = M.getDataLayout();
+      uint64_t Size = DL.getTypeAllocSize(Alias.getValueType());
+      OutStreamer->emitELFSize(cast<MCSymbolELF>(Name),
+                               MCConstantExpr::create(Size, OutContext));
+    }
   }
 
   GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
@@ -1102,26 +1223,26 @@ bool AsmPrinter::doFinalization(Module &M) {
 
   // Emit __morestack address if needed for indirect calls.
   if (MMI->usesMorestackAddr()) {
-    const MCSection *ReadOnlySection =
-        getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly(),
-                                                   /*C=*/nullptr);
-    OutStreamer.SwitchSection(ReadOnlySection);
+    MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
+        getDataLayout(), SectionKind::getReadOnly(),
+        /*C=*/nullptr);
+    OutStreamer->SwitchSection(ReadOnlySection);
 
     MCSymbol *AddrSymbol =
-        OutContext.GetOrCreateSymbol(StringRef("__morestack_addr"));
-    OutStreamer.EmitLabel(AddrSymbol);
+        OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
+    OutStreamer->EmitLabel(AddrSymbol);
 
-    unsigned PtrSize = TM.getDataLayout()->getPointerSize(0);
-    OutStreamer.EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
-                                PtrSize);
+    unsigned PtrSize = M.getDataLayout().getPointerSize(0);
+    OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
+                                 PtrSize);
   }
 
   // If we don't have any trampolines, then we don't require stack memory
   // to be executable. Some targets have a directive to declare this.
   Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
   if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
-    if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext))
-      OutStreamer.SwitchSection(S);
+    if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
+      OutStreamer->SwitchSection(S);
 
   // Allow the target to emit any magic that it wants at the end of the file,
   // after everything else has gone out.
@@ -1130,8 +1251,8 @@ bool AsmPrinter::doFinalization(Module &M) {
   delete Mang; Mang = nullptr;
   MMI = nullptr;
 
-  OutStreamer.Finish();
-  OutStreamer.reset();
+  OutStreamer->Finish();
+  OutStreamer->reset();
 
   return false;
 }
@@ -1151,7 +1272,7 @@ void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
   CurExceptionSym = nullptr;
   bool NeedsLocalForSize = MAI->needsLocalForSize();
   if (!MMI->getLandingPads().empty() || MMI->hasDebugInfo() ||
-      NeedsLocalForSize) {
+      MMI->hasEHFunclets() || NeedsLocalForSize) {
     CurrentFnBegin = createTempSymbol("func_begin");
     if (NeedsLocalForSize)
       CurrentFnSymForSize = CurrentFnBegin;
@@ -1162,12 +1283,12 @@ void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
 }
 
 namespace {
-  // SectionCPs - Keep track the alignment, constpool entries per Section.
+// Keep track the alignment, constpool entries per Section.
   struct SectionCPs {
-    const MCSection *S;
+    MCSection *S;
     unsigned Alignment;
     SmallVector<unsigned, 4> CPEs;
-    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
+    SectionCPs(MCSection *s, unsigned a) : S(s), Alignment(a) {}
   };
 }
 
@@ -1188,14 +1309,14 @@ void AsmPrinter::EmitConstantPool() {
     const MachineConstantPoolEntry &CPE = CP[i];
     unsigned Align = CPE.getAlignment();
 
-    SectionKind Kind =
-        CPE.getSectionKind(TM.getDataLayout());
+    SectionKind Kind = CPE.getSectionKind(&getDataLayout());
 
     const Constant *C = nullptr;
     if (!CPE.isMachineConstantPoolEntry())
       C = CPE.Val.ConstVal;
 
-    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind, C);
+    MCSection *S =
+        getObjFileLowering().getSectionForConstant(getDataLayout(), Kind, C);
 
     // The number of sections are small, just do a linear search from the
     // last section to the first.
@@ -1228,7 +1349,7 @@ void AsmPrinter::EmitConstantPool() {
         continue;
 
       if (CurSection != CPSections[i].S) {
-        OutStreamer.SwitchSection(CPSections[i].S);
+        OutStreamer->SwitchSection(CPSections[i].S);
         EmitAlignment(Log2_32(CPSections[i].Alignment));
         CurSection = CPSections[i].S;
         Offset = 0;
@@ -1239,17 +1360,16 @@ void AsmPrinter::EmitConstantPool() {
       // Emit inter-object padding for alignment.
       unsigned AlignMask = CPE.getAlignment() - 1;
       unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
-      OutStreamer.EmitZeros(NewOffset - Offset);
+      OutStreamer->EmitZeros(NewOffset - Offset);
 
       Type *Ty = CPE.getType();
-      Offset = NewOffset +
-               TM.getDataLayout()->getTypeAllocSize(Ty);
+      Offset = NewOffset + getDataLayout().getTypeAllocSize(Ty);
 
-      OutStreamer.EmitLabel(Sym);
+      OutStreamer->EmitLabel(Sym);
       if (CPE.isMachineConstantPoolEntry())
         EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
       else
-        EmitGlobalConstant(CPE.Val.ConstVal);
+        EmitGlobalConstant(getDataLayout(), CPE.Val.ConstVal);
     }
   }
 }
@@ -1258,7 +1378,7 @@ void AsmPrinter::EmitConstantPool() {
 /// by the current function to the current output stream.
 ///
 void AsmPrinter::EmitJumpTableInfo() {
-  const DataLayout *DL = MF->getTarget().getDataLayout();
+  const DataLayout &DL = MF->getDataLayout();
   const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
   if (!MJTI) return;
   if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
@@ -1274,18 +1394,16 @@ void AsmPrinter::EmitJumpTableInfo() {
       *F);
   if (JTInDiffSection) {
     // Drop it in the readonly section.
-    const MCSection *ReadOnlySection =
-        TLOF.getSectionForJumpTable(*F, *Mang, TM);
-    OutStreamer.SwitchSection(ReadOnlySection);
+    MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(*F, *Mang, TM);
+    OutStreamer->SwitchSection(ReadOnlySection);
   }
 
-  EmitAlignment(Log2_32(
-      MJTI->getEntryAlignment(*TM.getDataLayout())));
+  EmitAlignment(Log2_32(MJTI->getEntryAlignment(DL)));
 
   // Jump tables in code sections are marked with a data_region directive
   // where that's supported.
   if (!JTInDiffSection)
-    OutStreamer.EmitDataRegion(MCDR_DataRegionJT32);
+    OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
 
   for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
     const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
@@ -1307,9 +1425,10 @@ void AsmPrinter::EmitJumpTableInfo() {
 
         // .set LJTSet, LBB32-base
         const MCExpr *LHS =
-          MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
-        OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
-                                MCBinaryExpr::CreateSub(LHS, Base, OutContext));
+          MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
+        OutStreamer->EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
+                                    MCBinaryExpr::createSub(LHS, Base,
+                                                            OutContext));
       }
     }
 
@@ -1317,18 +1436,18 @@ void AsmPrinter::EmitJumpTableInfo() {
     // before each jump table.  The first label is never referenced, but tells
     // the assembler and linker the extents of the jump table object.  The
     // second label is actually referenced by the code.
-    if (JTInDiffSection && DL->hasLinkerPrivateGlobalPrefix())
+    if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
       // FIXME: This doesn't have to have any specific name, just any randomly
       // named and numbered 'l' label would work.  Simplify GetJTISymbol.
-      OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
+      OutStreamer->EmitLabel(GetJTISymbol(JTI, true));
 
-    OutStreamer.EmitLabel(GetJTISymbol(JTI));
+    OutStreamer->EmitLabel(GetJTISymbol(JTI));
 
     for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
       EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
   }
   if (!JTInDiffSection)
-    OutStreamer.EmitDataRegion(MCDR_DataRegionEnd);
+    OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
 }
 
 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
@@ -1348,14 +1467,14 @@ void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
   case MachineJumpTableInfo::EK_BlockAddress:
     // EK_BlockAddress - Each entry is a plain address of block, e.g.:
     //     .word LBB123
-    Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
+    Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
     break;
   case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
     // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
     // with a relocation as gp-relative, e.g.:
     //     .gprel32 LBB123
     MCSymbol *MBBSym = MBB->getSymbol();
-    OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
+    OutStreamer->EmitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
     return;
   }
 
@@ -1364,7 +1483,7 @@ void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
     // with a relocation as gp-relative, e.g.:
     //     .gpdword LBB123
     MCSymbol *MBBSym = MBB->getSymbol();
-    OutStreamer.EmitGPRel64Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
+    OutStreamer->EmitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
     return;
   }
 
@@ -1377,23 +1496,22 @@ void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
     //      .set L4_5_set_123, LBB123 - LJTI1_2
     //      .word L4_5_set_123
     if (MAI->doesSetDirectiveSuppressesReloc()) {
-      Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
+      Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
                                       OutContext);
       break;
     }
-    Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
+    Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
     const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
     const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
-    Value = MCBinaryExpr::CreateSub(Value, Base, OutContext);
+    Value = MCBinaryExpr::createSub(Value, Base, OutContext);
     break;
   }
   }
 
   assert(Value && "Unknown entry kind!");
 
-  unsigned EntrySize =
-      MJTI->getEntrySize(*TM.getDataLayout());
-  OutStreamer.EmitValue(Value, EntrySize);
+  unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
+  OutStreamer->EmitValue(Value, EntrySize);
 }
 
 
@@ -1417,25 +1535,27 @@ bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
   assert(GV->hasInitializer() && "Not a special LLVM global!");
 
   if (GV->getName() == "llvm.global_ctors") {
-    EmitXXStructorList(GV->getInitializer(), /* isCtor */ true);
+    EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
+                       /* isCtor */ true);
 
     if (TM.getRelocationModel() == Reloc::Static &&
         MAI->hasStaticCtorDtorReferenceInStaticMode()) {
       StringRef Sym(".constructors_used");
-      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
-                                      MCSA_Reference);
+      OutStreamer->EmitSymbolAttribute(OutContext.getOrCreateSymbol(Sym),
+                                       MCSA_Reference);
     }
     return true;
   }
 
   if (GV->getName() == "llvm.global_dtors") {
-    EmitXXStructorList(GV->getInitializer(), /* isCtor */ false);
+    EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
+                       /* isCtor */ false);
 
     if (TM.getRelocationModel() == Reloc::Static &&
         MAI->hasStaticCtorDtorReferenceInStaticMode()) {
       StringRef Sym(".destructors_used");
-      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
-                                      MCSA_Reference);
+      OutStreamer->EmitSymbolAttribute(OutContext.getOrCreateSymbol(Sym),
+                                       MCSA_Reference);
     }
     return true;
   }
@@ -1452,7 +1572,7 @@ void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
     const GlobalValue *GV =
       dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
     if (GV)
-      OutStreamer.EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
+      OutStreamer->EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
   }
 }
 
@@ -1467,7 +1587,8 @@ struct Structor {
 
 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
 /// priority.
-void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
+void AsmPrinter::EmitXXStructorList(const DataLayout &DL, const Constant *List,
+                                    bool isCtor) {
   // Should be an array of '{ int, void ()* }' structs.  The first value is the
   // init priority.
   if (!isa<ConstantArray>(List)) return;
@@ -1502,8 +1623,7 @@ void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
   }
 
   // Emit the function pointers in the target-specific order
-  const DataLayout *DL = TM.getDataLayout();
-  unsigned Align = Log2_32(DL->getPointerPrefAlignment());
+  unsigned Align = Log2_32(DL.getPointerPrefAlignment());
   std::stable_sort(Structors.begin(), Structors.end(),
                    [](const Structor &L,
                       const Structor &R) { return L.Priority < R.Priority; });
@@ -1518,13 +1638,13 @@ void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
 
       KeySym = getSymbol(GV);
     }
-    const MCSection *OutputSection =
+    MCSection *OutputSection =
         (isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
                 : Obj.getStaticDtorSection(S.Priority, KeySym));
-    OutStreamer.SwitchSection(OutputSection);
-    if (OutStreamer.getCurrentSection() != OutStreamer.getPreviousSection())
+    OutStreamer->SwitchSection(OutputSection);
+    if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
       EmitAlignment(Align);
-    EmitXXStructor(S.Func);
+    EmitXXStructor(DL, S.Func);
   }
 }
 
@@ -1538,7 +1658,7 @@ void AsmPrinter::EmitModuleIdents(Module &M) {
       assert(N->getNumOperands() == 1 &&
              "llvm.ident metadata entry can have only one operand");
       const MDString *S = cast<MDString>(N->getOperand(0));
-      OutStreamer.EmitIdent(S->getString());
+      OutStreamer->EmitIdent(S->getString());
     }
   }
 }
@@ -1550,19 +1670,19 @@ void AsmPrinter::EmitModuleIdents(Module &M) {
 /// EmitInt8 - Emit a byte directive and value.
 ///
 void AsmPrinter::EmitInt8(int Value) const {
-  OutStreamer.EmitIntValue(Value, 1);
+  OutStreamer->EmitIntValue(Value, 1);
 }
 
 /// EmitInt16 - Emit a short directive and value.
 ///
 void AsmPrinter::EmitInt16(int Value) const {
-  OutStreamer.EmitIntValue(Value, 2);
+  OutStreamer->EmitIntValue(Value, 2);
 }
 
 /// EmitInt32 - Emit a long directive and value.
 ///
 void AsmPrinter::EmitInt32(int Value) const {
-  OutStreamer.EmitIntValue(Value, 4);
+  OutStreamer->EmitIntValue(Value, 4);
 }
 
 /// Emit something like ".long Hi-Lo" where the size in bytes of the directive
@@ -1570,21 +1690,7 @@ void AsmPrinter::EmitInt32(int Value) const {
 /// .set if it avoids relocations.
 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
                                      unsigned Size) const {
-  // Get the Hi-Lo expression.
-  const MCExpr *Diff =
-    MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
-                            MCSymbolRefExpr::Create(Lo, OutContext),
-                            OutContext);
-
-  if (!MAI->doesSetDirectiveSuppressesReloc()) {
-    OutStreamer.EmitValue(Diff, Size);
-    return;
-  }
-
-  // Otherwise, emit with .set (aka assignment).
-  MCSymbol *SetLabel = createTempSymbol("set");
-  OutStreamer.EmitAssignment(SetLabel, Diff);
-  OutStreamer.EmitSymbolValue(SetLabel, Size);
+  OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
 }
 
 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
@@ -1594,17 +1700,17 @@ void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
                                      unsigned Size,
                                      bool IsSectionRelative) const {
   if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
-    OutStreamer.EmitCOFFSecRel32(Label);
+    OutStreamer->EmitCOFFSecRel32(Label);
     return;
   }
 
   // Emit Label+Offset (or just Label if Offset is zero)
-  const MCExpr *Expr = MCSymbolRefExpr::Create(Label, OutContext);
+  const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
   if (Offset)
-    Expr = MCBinaryExpr::CreateAdd(
-        Expr, MCConstantExpr::Create(Offset, OutContext), OutContext);
+    Expr = MCBinaryExpr::createAdd(
+        Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
 
-  OutStreamer.EmitValue(Expr, Size);
+  OutStreamer->EmitValue(Expr, Size);
 }
 
 //===----------------------------------------------------------------------===//
@@ -1617,8 +1723,7 @@ void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
 //
 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalObject *GV) const {
   if (GV)
-    NumBits = getGVAlignmentLog2(GV, *TM.getDataLayout(),
-                                 NumBits);
+    NumBits = getGVAlignmentLog2(GV, GV->getParent()->getDataLayout(), NumBits);
 
   if (NumBits == 0) return;   // 1-byte aligned: no need to emit alignment.
 
@@ -1626,9 +1731,9 @@ void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalObject *GV) const {
              static_cast<unsigned>(std::numeric_limits<unsigned>::digits) &&
          "undefined behavior");
   if (getCurrentSection()->getKind().isText())
-    OutStreamer.EmitCodeAlignment(1u << NumBits);
+    OutStreamer->EmitCodeAlignment(1u << NumBits);
   else
-    OutStreamer.EmitValueToAlignment(1u << NumBits);
+    OutStreamer->EmitValueToAlignment(1u << NumBits);
 }
 
 //===----------------------------------------------------------------------===//
@@ -1639,16 +1744,16 @@ const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
   MCContext &Ctx = OutContext;
 
   if (CV->isNullValue() || isa<UndefValue>(CV))
-    return MCConstantExpr::Create(0, Ctx);
+    return MCConstantExpr::create(0, Ctx);
 
   if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
-    return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
+    return MCConstantExpr::create(CI->getZExtValue(), Ctx);
 
   if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
-    return MCSymbolRefExpr::Create(getSymbol(GV), Ctx);
+    return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
 
   if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
-    return MCSymbolRefExpr::Create(GetBlockAddressSymbol(BA), Ctx);
+    return MCSymbolRefExpr::create(GetBlockAddressSymbol(BA), Ctx);
 
   const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
   if (!CE) {
@@ -1664,7 +1769,7 @@ const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
     // If the code isn't optimized, there may be outstanding folding
     // opportunities. Attempt to fold the expression using DataLayout as a
     // last resort before giving up.
-    if (Constant *C = ConstantFoldConstantExpression(CE, *TM.getDataLayout()))
+    if (Constant *C = ConstantFoldConstantExpression(CE, getDataLayout()))
       if (C != CE)
         return lowerConstant(C);
 
@@ -1678,18 +1783,16 @@ const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
       report_fatal_error(OS.str());
     }
   case Instruction::GetElementPtr: {
-    const DataLayout &DL = *TM.getDataLayout();
-
     // Generate a symbolic expression for the byte address
-    APInt OffsetAI(DL.getPointerTypeSizeInBits(CE->getType()), 0);
-    cast<GEPOperator>(CE)->accumulateConstantOffset(DL, OffsetAI);
+    APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
+    cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
 
     const MCExpr *Base = lowerConstant(CE->getOperand(0));
     if (!OffsetAI)
       return Base;
 
     int64_t Offset = OffsetAI.getSExtValue();
-    return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
+    return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
                                    Ctx);
   }
 
@@ -1703,7 +1806,7 @@ const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
     return lowerConstant(CE->getOperand(0));
 
   case Instruction::IntToPtr: {
-    const DataLayout &DL = *TM.getDataLayout();
+    const DataLayout &DL = getDataLayout();
 
     // Handle casts to pointers by changing them into casts to the appropriate
     // integer type.  This promotes constant folding and simplifies this code.
@@ -1714,7 +1817,7 @@ const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
   }
 
   case Instruction::PtrToInt: {
-    const DataLayout &DL = *TM.getDataLayout();
+    const DataLayout &DL = getDataLayout();
 
     // Support only foldable casts to/from pointers that can be eliminated by
     // changing the pointer to the appropriately sized integer type.
@@ -1732,8 +1835,8 @@ const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
     // the high bits so we are sure to get a proper truncation if the input is
     // a constant expr.
     unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
-    const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
-    return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
+    const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
+    return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
   }
 
   // The MC library also has a right-shift operator, but it isn't consistently
@@ -1751,21 +1854,22 @@ const MCExpr *AsmPrinter::lowerConstant(const Constant *CV) {
     const MCExpr *RHS = lowerConstant(CE->getOperand(1));
     switch (CE->getOpcode()) {
     default: llvm_unreachable("Unknown binary operator constant cast expr");
-    case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
-    case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
-    case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
-    case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
-    case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
-    case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
-    case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
-    case Instruction::Or:  return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
-    case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
+    case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
+    case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
+    case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
+    case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
+    case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
+    case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
+    case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
+    case Instruction::Or:  return MCBinaryExpr::createOr (LHS, RHS, Ctx);
+    case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
     }
   }
   }
 }
 
-static void emitGlobalConstantImpl(const Constant *C, AsmPrinter &AP,
+static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
+                                   AsmPrinter &AP,
                                    const Constant *BaseCV = nullptr,
                                    uint64_t Offset = 0);
 
@@ -1785,41 +1889,31 @@ static int isRepeatedByteSequence(const ConstantDataSequential *V) {
 /// isRepeatedByteSequence - Determine whether the given value is
 /// composed of a repeated sequence of identical bytes and return the
 /// byte value.  If it is not a repeated sequence, return -1.
-static int isRepeatedByteSequence(const Value *V, TargetMachine &TM) {
-
+static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
   if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
-    if (CI->getBitWidth() > 64) return -1;
-
-    uint64_t Size =
-        TM.getDataLayout()->getTypeAllocSize(V->getType());
-    uint64_t Value = CI->getZExtValue();
-
-    // Make sure the constant is at least 8 bits long and has a power
-    // of 2 bit width.  This guarantees the constant bit width is
-    // always a multiple of 8 bits, avoiding issues with padding out
-    // to Size and other such corner cases.
-    if (CI->getBitWidth() < 8 || !isPowerOf2_64(CI->getBitWidth())) return -1;
+    uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
+    assert(Size % 8 == 0);
 
-    uint8_t Byte = static_cast<uint8_t>(Value);
+    // Extend the element to take zero padding into account.
+    APInt Value = CI->getValue().zextOrSelf(Size);
+    if (!Value.isSplat(8))
+      return -1;
 
-    for (unsigned i = 1; i < Size; ++i) {
-      Value >>= 8;
-      if (static_cast<uint8_t>(Value) != Byte) return -1;
-    }
-    return Byte;
+    return Value.zextOrTrunc(8).getZExtValue();
   }
   if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
     // Make sure all array elements are sequences of the same repeated
     // byte.
     assert(CA->getNumOperands() != 0 && "Should be a CAZ");
-    int Byte = isRepeatedByteSequence(CA->getOperand(0), TM);
-    if (Byte == -1) return -1;
-
-    for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i) {
-      int ThisByte = isRepeatedByteSequence(CA->getOperand(i), TM);
-      if (ThisByte == -1) return -1;
-      if (Byte != ThisByte) return -1;
-    }
+    Constant *Op0 = CA->getOperand(0);
+    int Byte = isRepeatedByteSequence(Op0, DL);
+    if (Byte == -1)
+      return -1;
+
+    // All array elements must be equal.
+    for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
+      if (CA->getOperand(i) != Op0)
+        return -1;
     return Byte;
   }
 
@@ -1829,33 +1923,32 @@ static int isRepeatedByteSequence(const Value *V, TargetMachine &TM) {
   return -1;
 }
 
-static void emitGlobalConstantDataSequential(const ConstantDataSequential *CDS,
-                                             AsmPrinter &AP){
+static void emitGlobalConstantDataSequential(const DataLayout &DL,
+                                             const ConstantDataSequential *CDS,
+                                             AsmPrinter &AP) {
 
   // See if we can aggregate this into a .fill, if so, emit it as such.
-  int Value = isRepeatedByteSequence(CDS, AP.TM);
+  int Value = isRepeatedByteSequence(CDS, DL);
   if (Value != -1) {
-    uint64_t Bytes =
-        AP.TM.getDataLayout()->getTypeAllocSize(
-            CDS->getType());
+    uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
     // Don't emit a 1-byte object as a .fill.
     if (Bytes > 1)
-      return AP.OutStreamer.EmitFill(Bytes, Value);
+      return AP.OutStreamer->EmitFill(Bytes, Value);
   }
 
   // If this can be emitted with .ascii/.asciz, emit it as such.
   if (CDS->isString())
-    return AP.OutStreamer.EmitBytes(CDS->getAsString());
+    return AP.OutStreamer->EmitBytes(CDS->getAsString());
 
   // Otherwise, emit the values in successive locations.
   unsigned ElementByteSize = CDS->getElementByteSize();
   if (isa<IntegerType>(CDS->getElementType())) {
     for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
       if (AP.isVerbose())
-        AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
-                                                CDS->getElementAsInteger(i));
-      AP.OutStreamer.EmitIntValue(CDS->getElementAsInteger(i),
-                                  ElementByteSize);
+        AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
+                                                 CDS->getElementAsInteger(i));
+      AP.OutStreamer->EmitIntValue(CDS->getElementAsInteger(i),
+                                   ElementByteSize);
     }
   } else if (ElementByteSize == 4) {
     // FP Constants are printed as integer constants to avoid losing
@@ -1869,8 +1962,8 @@ static void emitGlobalConstantDataSequential(const ConstantDataSequential *CDS,
 
       F = CDS->getElementAsFloat(i);
       if (AP.isVerbose())
-        AP.OutStreamer.GetCommentOS() << "float " << F << '\n';
-      AP.OutStreamer.EmitIntValue(I, 4);
+        AP.OutStreamer->GetCommentOS() << "float " << F << '\n';
+      AP.OutStreamer->EmitIntValue(I, 4);
     }
   } else {
     assert(CDS->getElementType()->isDoubleTy());
@@ -1882,66 +1975,65 @@ static void emitGlobalConstantDataSequential(const ConstantDataSequential *CDS,
 
       F = CDS->getElementAsDouble(i);
       if (AP.isVerbose())
-        AP.OutStreamer.GetCommentOS() << "double " << F << '\n';
-      AP.OutStreamer.EmitIntValue(I, 8);
+        AP.OutStreamer->GetCommentOS() << "double " << F << '\n';
+      AP.OutStreamer->EmitIntValue(I, 8);
     }
   }
 
-  const DataLayout &DL = *AP.TM.getDataLayout();
   unsigned Size = DL.getTypeAllocSize(CDS->getType());
   unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
                         CDS->getNumElements();
   if (unsigned Padding = Size - EmittedSize)
-    AP.OutStreamer.EmitZeros(Padding);
+    AP.OutStreamer->EmitZeros(Padding);
 
 }
 
-static void emitGlobalConstantArray(const ConstantArray *CA, AsmPrinter &AP,
+static void emitGlobalConstantArray(const DataLayout &DL,
+                                    const ConstantArray *CA, AsmPrinter &AP,
                                     const Constant *BaseCV, uint64_t Offset) {
   // See if we can aggregate some values.  Make sure it can be
   // represented as a series of bytes of the constant value.
-  int Value = isRepeatedByteSequence(CA, AP.TM);
-  const DataLayout &DL = *AP.TM.getDataLayout();
+  int Value = isRepeatedByteSequence(CA, DL);
 
   if (Value != -1) {
     uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
-    AP.OutStreamer.EmitFill(Bytes, Value);
+    AP.OutStreamer->EmitFill(Bytes, Value);
   }
   else {
     for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
-      emitGlobalConstantImpl(CA->getOperand(i), AP, BaseCV, Offset);
+      emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
       Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
     }
   }
 }
 
-static void emitGlobalConstantVector(const ConstantVector *CV, AsmPrinter &AP) {
+static void emitGlobalConstantVector(const DataLayout &DL,
+                                     const ConstantVector *CV, AsmPrinter &AP) {
   for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
-    emitGlobalConstantImpl(CV->getOperand(i), AP);
+    emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
 
-  const DataLayout &DL = *AP.TM.getDataLayout();
   unsigned Size = DL.getTypeAllocSize(CV->getType());
   unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
                          CV->getType()->getNumElements();
   if (unsigned Padding = Size - EmittedSize)
-    AP.OutStreamer.EmitZeros(Padding);
+    AP.OutStreamer->EmitZeros(Padding);
 }
 
-static void emitGlobalConstantStruct(const ConstantStruct *CS, AsmPrinter &AP,
+static void emitGlobalConstantStruct(const DataLayout &DL,
+                                     const ConstantStruct *CS, AsmPrinter &AP,
                                      const Constant *BaseCV, uint64_t Offset) {
   // Print the fields in successive locations. Pad to align if needed!
-  const DataLayout *DL = AP.TM.getDataLayout();
-  unsigned Size = DL->getTypeAllocSize(CS->getType());
-  const StructLayout *Layout = DL->getStructLayout(CS->getType());
+  unsigned Size = DL.getTypeAllocSize(CS->getType());
+  const StructLayout *Layout = DL.getStructLayout(CS->getType());
   uint64_t SizeSoFar = 0;
   for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
     const Constant *Field = CS->getOperand(i);
 
     // Print the actual field value.
-    emitGlobalConstantImpl(Field, AP, BaseCV, Offset+SizeSoFar);
+    emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
 
     // Check if padding is needed and insert one or more 0s.
-    uint64_t FieldSize = DL->getTypeAllocSize(Field->getType());
+    uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
     uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
                         - Layout->getElementOffset(i)) - FieldSize;
     SizeSoFar += FieldSize + PadSize;
@@ -1949,7 +2041,7 @@ static void emitGlobalConstantStruct(const ConstantStruct *CS, AsmPrinter &AP,
     // Insert padding - this may include padding to increase the size of the
     // current field up to the ABI size (if the struct is not packed) as well
     // as padding to ensure that the next field starts at the right offset.
-    AP.OutStreamer.EmitZeros(PadSize);
+    AP.OutStreamer->EmitZeros(PadSize);
   }
   assert(SizeSoFar == Layout->getSizeInBytes() &&
          "Layout of constant struct may be incorrect!");
@@ -1965,10 +2057,10 @@ static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
     CFP->getValueAPF().toString(StrVal);
 
     if (CFP->getType())
-      CFP->getType()->print(AP.OutStreamer.GetCommentOS());
+      CFP->getType()->print(AP.OutStreamer->GetCommentOS());
     else
-      AP.OutStreamer.GetCommentOS() << "Printing <null> Type";
-    AP.OutStreamer.GetCommentOS() << ' ' << StrVal << '\n';
+      AP.OutStreamer->GetCommentOS() << "Printing <null> Type";
+    AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
   }
 
   // Now iterate through the APInt chunks, emitting them in endian-correct
@@ -1980,32 +2072,31 @@ static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
 
   // PPC's long double has odd notions of endianness compared to how LLVM
   // handles it: p[0] goes first for *big* endian on PPC.
-  if (AP.TM.getDataLayout()->isBigEndian() &&
-      !CFP->getType()->isPPC_FP128Ty()) {
+  if (AP.getDataLayout().isBigEndian() && !CFP->getType()->isPPC_FP128Ty()) {
     int Chunk = API.getNumWords() - 1;
 
     if (TrailingBytes)
-      AP.OutStreamer.EmitIntValue(p[Chunk--], TrailingBytes);
+      AP.OutStreamer->EmitIntValue(p[Chunk--], TrailingBytes);
 
     for (; Chunk >= 0; --Chunk)
-      AP.OutStreamer.EmitIntValue(p[Chunk], sizeof(uint64_t));
+      AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
   } else {
     unsigned Chunk;
     for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
-      AP.OutStreamer.EmitIntValue(p[Chunk], sizeof(uint64_t));
+      AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
 
     if (TrailingBytes)
-      AP.OutStreamer.EmitIntValue(p[Chunk], TrailingBytes);
+      AP.OutStreamer->EmitIntValue(p[Chunk], TrailingBytes);
   }
 
   // Emit the tail padding for the long double.
-  const DataLayout &DL = *AP.TM.getDataLayout();
-  AP.OutStreamer.EmitZeros(DL.getTypeAllocSize(CFP->getType()) -
-                           DL.getTypeStoreSize(CFP->getType()));
+  const DataLayout &DL = AP.getDataLayout();
+  AP.OutStreamer->EmitZeros(DL.getTypeAllocSize(CFP->getType()) -
+                            DL.getTypeStoreSize(CFP->getType()));
 }
 
 static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP) {
-  const DataLayout *DL = AP.TM.getDataLayout();
+  const DataLayout &DL = AP.getDataLayout();
   unsigned BitWidth = CI->getBitWidth();
 
   // Copy the value as we may massage the layout for constants whose bit width
@@ -2022,7 +2113,7 @@ static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP) {
     // Big endian:
     // * Record the extra bits to emit.
     // * Realign the raw data to emit the chunks of 64-bits.
-    if (DL->isBigEndian()) {
+    if (DL.isBigEndian()) {
       // Basically the structure of the raw data is a chunk of 64-bits cells:
       //    0        1         BitWidth / 64
       // [chunk1][chunk2] ... [chunkN].
@@ -2043,21 +2134,20 @@ static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP) {
   // quantities at a time.
   const uint64_t *RawData = Realigned.getRawData();
   for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
-    uint64_t Val = DL->isBigEndian() ? RawData[e - i - 1] : RawData[i];
-    AP.OutStreamer.EmitIntValue(Val, 8);
+    uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
+    AP.OutStreamer->EmitIntValue(Val, 8);
   }
 
   if (ExtraBitsSize) {
     // Emit the extra bits after the 64-bits chunks.
 
     // Emit a directive that fills the expected size.
-    uint64_t Size = AP.TM.getDataLayout()->getTypeAllocSize(
-        CI->getType());
+    uint64_t Size = AP.getDataLayout().getTypeAllocSize(CI->getType());
     Size -= (BitWidth / 64) * 8;
     assert(Size && Size * 8 >= ExtraBitsSize &&
            (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))
            == ExtraBits && "Directive too small for extra bits.");
-    AP.OutStreamer.EmitIntValue(ExtraBits, Size);
+    AP.OutStreamer->EmitIntValue(ExtraBits, Size);
   }
 }
 
@@ -2083,25 +2173,32 @@ static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
   //    cstexpr := <gotequiv> - "." + <cst>
   //    cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
   //
-  // After canonicalization by EvaluateAsRelocatable `ME` turns into:
+  // After canonicalization by evaluateAsRelocatable `ME` turns into:
   //
   //  cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
   //    gotpcrelcst := <offset from @foo base> + <cst>
   //
   MCValue MV;
-  if (!(*ME)->EvaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
+  if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
+    return;
+  const MCSymbolRefExpr *SymA = MV.getSymA();
+  if (!SymA)
     return;
 
-  const MCSymbol *GOTEquivSym = &MV.getSymA()->getSymbol();
+  // Check that GOT equivalent symbol is cached.
+  const MCSymbol *GOTEquivSym = &SymA->getSymbol();
   if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
     return;
 
-  const GlobalValue *BaseGV = dyn_cast<GlobalValue>(BaseCst);
+  const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
   if (!BaseGV)
     return;
 
+  // Check for a valid base symbol
   const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
-  if (BaseSym != &MV.getSymB()->getSymbol())
+  const MCSymbolRefExpr *SymB = MV.getSymB();
+
+  if (!SymB || BaseSym != &SymB->getSymbol())
     return;
 
   // Make sure to match:
@@ -2140,7 +2237,7 @@ static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
   const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
   const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
   *ME = AP.getObjFileLowering().getIndirectSymViaGOTPCRel(
-      FinalSym, MV, Offset, AP.MMI, AP.OutStreamer);
+      FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
 
   // Update GOT equivalent usage information
   --NumUses;
@@ -2148,10 +2245,10 @@ static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
     AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
 }
 
-static void emitGlobalConstantImpl(const Constant *CV, AsmPrinter &AP,
-                                   const Constant *BaseCV, uint64_t Offset) {
-  const DataLayout *DL = AP.TM.getDataLayout();
-  uint64_t Size = DL->getTypeAllocSize(CV->getType());
+static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
+                                   AsmPrinter &AP, const Constant *BaseCV,
+                                   uint64_t Offset) {
+  uint64_t Size = DL.getTypeAllocSize(CV->getType());
 
   // Globals with sub-elements such as combinations of arrays and structs
   // are handled recursively by emitGlobalConstantImpl. Keep track of the
@@ -2160,7 +2257,7 @@ static void emitGlobalConstantImpl(const Constant *CV, AsmPrinter &AP,
     BaseCV = dyn_cast<Constant>(CV->user_back());
 
   if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
-    return AP.OutStreamer.EmitZeros(Size);
+    return AP.OutStreamer->EmitZeros(Size);
 
   if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
     switch (Size) {
@@ -2169,9 +2266,9 @@ static void emitGlobalConstantImpl(const Constant *CV, AsmPrinter &AP,
     case 4:
     case 8:
       if (AP.isVerbose())
-        AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
-                                                CI->getZExtValue());
-      AP.OutStreamer.EmitIntValue(CI->getZExtValue(), Size);
+        AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
+                                                 CI->getZExtValue());
+      AP.OutStreamer->EmitIntValue(CI->getZExtValue(), Size);
       return;
     default:
       emitGlobalConstantLargeInt(CI, AP);
@@ -2183,37 +2280,37 @@ static void emitGlobalConstantImpl(const Constant *CV, AsmPrinter &AP,
     return emitGlobalConstantFP(CFP, AP);
 
   if (isa<ConstantPointerNull>(CV)) {
-    AP.OutStreamer.EmitIntValue(0, Size);
+    AP.OutStreamer->EmitIntValue(0, Size);
     return;
   }
 
   if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
-    return emitGlobalConstantDataSequential(CDS, AP);
+    return emitGlobalConstantDataSequential(DL, CDS, AP);
 
   if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
-    return emitGlobalConstantArray(CVA, AP, BaseCV, Offset);
+    return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
 
   if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
-    return emitGlobalConstantStruct(CVS, AP, BaseCV, Offset);
+    return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
 
   if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
     // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
     // vectors).
     if (CE->getOpcode() == Instruction::BitCast)
-      return emitGlobalConstantImpl(CE->getOperand(0), AP);
+      return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
 
     if (Size > 8) {
       // If the constant expression's size is greater than 64-bits, then we have
       // to emit the value in chunks. Try to constant fold the value and emit it
       // that way.
-      Constant *New = ConstantFoldConstantExpression(CE, *DL);
+      Constant *New = ConstantFoldConstantExpression(CE, DL);
       if (New && New != CE)
-        return emitGlobalConstantImpl(New, AP);
+        return emitGlobalConstantImpl(DL, New, AP);
     }
   }
 
   if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
-    return emitGlobalConstantVector(V, AP);
+    return emitGlobalConstantVector(DL, V, AP);
 
   // Otherwise, it must be a ConstantExpr.  Lower it to an MCExpr, then emit it
   // thread the streamer with EmitValue.
@@ -2225,19 +2322,18 @@ static void emitGlobalConstantImpl(const Constant *CV, AsmPrinter &AP,
   if (AP.getObjFileLowering().supportIndirectSymViaGOTPCRel())
     handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
 
-  AP.OutStreamer.EmitValue(ME, Size);
+  AP.OutStreamer->EmitValue(ME, Size);
 }
 
 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
-void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
-  uint64_t Size =
-      TM.getDataLayout()->getTypeAllocSize(CV->getType());
+void AsmPrinter::EmitGlobalConstant(const DataLayout &DL, const Constant *CV) {
+  uint64_t Size = DL.getTypeAllocSize(CV->getType());
   if (Size)
-    emitGlobalConstantImpl(CV, *this);
+    emitGlobalConstantImpl(DL, CV, *this);
   else if (MAI->hasSubsectionsViaSymbols()) {
     // If the global has zero size, emit a single byte so that two labels don't
     // look like they are at the same location.
-    OutStreamer.EmitIntValue(0, 1);
+    OutStreamer->EmitIntValue(0, 1);
   }
 }
 
@@ -2271,10 +2367,10 @@ MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
 
 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
-  const DataLayout *DL = TM.getDataLayout();
-  return OutContext.GetOrCreateSymbol
-    (Twine(DL->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
-     + "_" + Twine(CPID));
+  const DataLayout &DL = getDataLayout();
+  return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
+                                      "CPI" + Twine(getFunctionNumber()) + "_" +
+                                      Twine(CPID));
 }
 
 /// GetJTISymbol - Return the symbol for the specified jump table entry.
@@ -2285,10 +2381,10 @@ MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
 /// FIXME: privatize to AsmPrinter.
 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
-  const DataLayout *DL = TM.getDataLayout();
-  return OutContext.GetOrCreateSymbol
-  (Twine(DL->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
-   Twine(UID) + "_set_" + Twine(MBBID));
+  const DataLayout &DL = getDataLayout();
+  return OutContext.getOrCreateSymbol(Twine(DL.getPrivateGlobalPrefix()) +
+                                      Twine(getFunctionNumber()) + "_" +
+                                      Twine(UID) + "_set_" + Twine(MBBID));
 }
 
 MCSymbol *AsmPrinter::getSymbolWithGlobalValueBase(const GlobalValue *GV,
@@ -2297,12 +2393,11 @@ MCSymbol *AsmPrinter::getSymbolWithGlobalValueBase(const GlobalValue *GV,
                                                            TM);
 }
 
-/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
-/// ExternalSymbol.
+/// Return the MCSymbol for the specified ExternalSymbol.
 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
   SmallString<60> NameStr;
-  Mang->getNameWithPrefix(NameStr, Sym);
-  return OutContext.GetOrCreateSymbol(NameStr);
+  Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
+  return OutContext.getOrCreateSymbol(NameStr);
 }
 
 
@@ -2347,16 +2442,16 @@ static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
   // If this block is not a loop header, just print out what is the loop header
   // and return.
   if (Header != &MBB) {
-    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
-                              Twine(AP.getFunctionNumber())+"_" +
-                              Twine(Loop->getHeader()->getNumber())+
-                              " Depth="+Twine(Loop->getLoopDepth()));
+    AP.OutStreamer->AddComment("  in Loop: Header=BB" +
+                               Twine(AP.getFunctionNumber())+"_" +
+                               Twine(Loop->getHeader()->getNumber())+
+                               " Depth="+Twine(Loop->getLoopDepth()));
     return;
   }
 
   // Otherwise, it is a loop header.  Print out information about child and
   // parent loops.
-  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
+  raw_ostream &OS = AP.OutStreamer->GetCommentOS();
 
   PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
 
@@ -2376,6 +2471,14 @@ static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
 /// MachineBasicBlock, an alignment (if present) and a comment describing
 /// it if appropriate.
 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) const {
+  // End the previous funclet and start a new one.
+  if (MBB.isEHFuncletEntry()) {
+    for (const HandlerInfo &HI : Handlers) {
+      HI.Handler->endFunclet();
+      HI.Handler->beginFunclet(MBB);
+    }
+  }
+
   // Emit an alignment directive for this block, if needed.
   if (unsigned Align = MBB.getAlignment())
     EmitAlignment(Align);
@@ -2387,29 +2490,32 @@ void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock &MBB) const {
   if (MBB.hasAddressTaken()) {
     const BasicBlock *BB = MBB.getBasicBlock();
     if (isVerbose())
-      OutStreamer.AddComment("Block address taken");
+      OutStreamer->AddComment("Block address taken");
 
-    std::vector<MCSymbol*> Symbols = MMI->getAddrLabelSymbolToEmit(BB);
-    for (auto *Sym : Symbols)
-      OutStreamer.EmitLabel(Sym);
+    // MBBs can have their address taken as part of CodeGen without having
+    // their corresponding BB's address taken in IR
+    if (BB->hasAddressTaken())
+      for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
+        OutStreamer->EmitLabel(Sym);
   }
 
   // Print some verbose block comments.
   if (isVerbose()) {
     if (const BasicBlock *BB = MBB.getBasicBlock())
       if (BB->hasName())
-        OutStreamer.AddComment("%" + BB->getName());
+        OutStreamer->AddComment("%" + BB->getName());
     emitBasicBlockLoopComments(MBB, LI, *this);
   }
 
   // Print the main label for the block.
-  if (MBB.pred_empty() || isBlockOnlyReachableByFallthrough(&MBB)) {
+  if (MBB.pred_empty() ||
+      (isBlockOnlyReachableByFallthrough(&MBB) && !MBB.isEHFuncletEntry())) {
     if (isVerbose()) {
       // NOTE: Want this comment at start of line, don't emit with AddComment.
-      OutStreamer.emitRawComment(" BB#" + Twine(MBB.getNumber()) + ":", false);
+      OutStreamer->emitRawComment(" BB#" + Twine(MBB.getNumber()) + ":", false);
     }
   } else {
-    OutStreamer.EmitLabel(MBB.getSymbol());
+    OutStreamer->EmitLabel(MBB.getSymbol());
   }
 }
 
@@ -2431,7 +2537,7 @@ void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
   }
 
   if (Attr != MCSA_Invalid)
-    OutStreamer.EmitSymbolAttribute(Sym, Attr);
+    OutStreamer->EmitSymbolAttribute(Sym, Attr);
 }
 
 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
@@ -2441,7 +2547,7 @@ bool AsmPrinter::
 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
   // If this is a landing pad, it isn't a fall through.  If it has no preds,
   // then nothing falls through to it.
-  if (MBB->isLandingPad() || MBB->pred_empty())
+  if (MBB->isEHPad() || MBB->pred_empty())
     return false;
 
   // If there isn't exactly one predecessor, it can't be a fall through.