Remove LLVM 8.0.1 files.

1 files changed, 0 insertions, 1546 deletions

diff --git a/gnu/llvm/lib/MC/ELFObjectWriter.cpp b/gnu/llvm/lib/MC/ELFObjectWriter.cpp
deleted file mode 100644
index 1b505776ca1..00000000000
--- a/gnu/llvm/lib/MC/ELFObjectWriter.cpp
+++ /dev/null
@@ -1,1546 +0,0 @@
-//===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -----------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements ELF object file writer information.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/Twine.h"
-#include "llvm/BinaryFormat/ELF.h"
-#include "llvm/MC/MCAsmBackend.h"
-#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/MC/MCAsmLayout.h"
-#include "llvm/MC/MCAssembler.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCELFObjectWriter.h"
-#include "llvm/MC/MCExpr.h"
-#include "llvm/MC/MCFixup.h"
-#include "llvm/MC/MCFixupKindInfo.h"
-#include "llvm/MC/MCFragment.h"
-#include "llvm/MC/MCObjectFileInfo.h"
-#include "llvm/MC/MCObjectWriter.h"
-#include "llvm/MC/MCSection.h"
-#include "llvm/MC/MCSectionELF.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCSymbolELF.h"
-#include "llvm/MC/MCValue.h"
-#include "llvm/MC/StringTableBuilder.h"
-#include "llvm/Support/Allocator.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/Compression.h"
-#include "llvm/Support/Endian.h"
-#include "llvm/Support/Error.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/Host.h"
-#include "llvm/Support/LEB128.h"
-#include "llvm/Support/MathExtras.h"
-#include "llvm/Support/SMLoc.h"
-#include "llvm/Support/StringSaver.h"
-#include "llvm/Support/SwapByteOrder.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-#include <cassert>
-#include <cstddef>
-#include <cstdint>
-#include <map>
-#include <memory>
-#include <string>
-#include <utility>
-#include <vector>
-
-using namespace llvm;
-
-#undef  DEBUG_TYPE
-#define DEBUG_TYPE "reloc-info"
-
-namespace {
-
-using SectionIndexMapTy = DenseMap<const MCSectionELF *, uint32_t>;
-
-class ELFObjectWriter;
-struct ELFWriter;
-
-bool isDwoSection(const MCSectionELF &Sec) {
-  return Sec.getSectionName().endswith(".dwo");
-}
-
-class SymbolTableWriter {
-  ELFWriter &EWriter;
-  bool Is64Bit;
-
-  // indexes we are going to write to .symtab_shndx.
-  std::vector<uint32_t> ShndxIndexes;
-
-  // The numbel of symbols written so far.
-  unsigned NumWritten;
-
-  void createSymtabShndx();
-
-  template <typename T> void write(T Value);
-
-public:
-  SymbolTableWriter(ELFWriter &EWriter, bool Is64Bit);
-
-  void writeSymbol(uint32_t name, uint8_t info, uint64_t value, uint64_t size,
-                   uint8_t other, uint32_t shndx, bool Reserved);
-
-  ArrayRef<uint32_t> getShndxIndexes() const { return ShndxIndexes; }
-};
-
-struct ELFWriter {
-  ELFObjectWriter &OWriter;
-  support::endian::Writer W;
-
-  enum DwoMode {
-    AllSections,
-    NonDwoOnly,
-    DwoOnly,
-  } Mode;
-
-  static uint64_t SymbolValue(const MCSymbol &Sym, const MCAsmLayout &Layout);
-  static bool isInSymtab(const MCAsmLayout &Layout, const MCSymbolELF &Symbol,
-                         bool Used, bool Renamed);
-
-  /// Helper struct for containing some precomputed information on symbols.
-  struct ELFSymbolData {
-    const MCSymbolELF *Symbol;
-    uint32_t SectionIndex;
-    StringRef Name;
-
-    // Support lexicographic sorting.
-    bool operator<(const ELFSymbolData &RHS) const {
-      unsigned LHSType = Symbol->getType();
-      unsigned RHSType = RHS.Symbol->getType();
-      if (LHSType == ELF::STT_SECTION && RHSType != ELF::STT_SECTION)
-        return false;
-      if (LHSType != ELF::STT_SECTION && RHSType == ELF::STT_SECTION)
-        return true;
-      if (LHSType == ELF::STT_SECTION && RHSType == ELF::STT_SECTION)
-        return SectionIndex < RHS.SectionIndex;
-      return Name < RHS.Name;
-    }
-  };
-
-  /// @}
-  /// @name Symbol Table Data
-  /// @{
-
-  StringTableBuilder StrTabBuilder{StringTableBuilder::ELF};
-
-  /// @}
-
-  // This holds the symbol table index of the last local symbol.
-  unsigned LastLocalSymbolIndex;
-  // This holds the .strtab section index.
-  unsigned StringTableIndex;
-  // This holds the .symtab section index.
-  unsigned SymbolTableIndex;
-
-  // Sections in the order they are to be output in the section table.
-  std::vector<const MCSectionELF *> SectionTable;
-  unsigned addToSectionTable(const MCSectionELF *Sec);
-
-  // TargetObjectWriter wrappers.
-  bool is64Bit() const;
-  bool hasRelocationAddend() const;
-
-  void align(unsigned Alignment);
-
-  bool maybeWriteCompression(uint64_t Size,
-                             SmallVectorImpl<char> &CompressedContents,
-                             bool ZLibStyle, unsigned Alignment);
-
-public:
-  ELFWriter(ELFObjectWriter &OWriter, raw_pwrite_stream &OS,
-            bool IsLittleEndian, DwoMode Mode)
-      : OWriter(OWriter),
-        W(OS, IsLittleEndian ? support::little : support::big), Mode(Mode) {}
-
-  void WriteWord(uint64_t Word) {
-    if (is64Bit())
-      W.write<uint64_t>(Word);
-    else
-      W.write<uint32_t>(Word);
-  }
-
-  template <typename T> void write(T Val) {
-    W.write(Val);
-  }
-
-  void writeHeader(const MCAssembler &Asm);
-
-  void writeSymbol(SymbolTableWriter &Writer, uint32_t StringIndex,
-                   ELFSymbolData &MSD, const MCAsmLayout &Layout);
-
-  // Start and end offset of each section
-  using SectionOffsetsTy =
-      std::map<const MCSectionELF *, std::pair<uint64_t, uint64_t>>;
-
-  // Map from a signature symbol to the group section index
-  using RevGroupMapTy = DenseMap<const MCSymbol *, unsigned>;
-
-  /// Compute the symbol table data
-  ///
-  /// \param Asm - The assembler.
-  /// \param SectionIndexMap - Maps a section to its index.
-  /// \param RevGroupMap - Maps a signature symbol to the group section.
-  void computeSymbolTable(MCAssembler &Asm, const MCAsmLayout &Layout,
-                          const SectionIndexMapTy &SectionIndexMap,
-                          const RevGroupMapTy &RevGroupMap,
-                          SectionOffsetsTy &SectionOffsets);
-
-  void writeAddrsigSection();
-
-  MCSectionELF *createRelocationSection(MCContext &Ctx,
-                                        const MCSectionELF &Sec);
-
-  const MCSectionELF *createStringTable(MCContext &Ctx);
-
-  void writeSectionHeader(const MCAsmLayout &Layout,
-                          const SectionIndexMapTy &SectionIndexMap,
-                          const SectionOffsetsTy &SectionOffsets);
-
-  void writeSectionData(const MCAssembler &Asm, MCSection &Sec,
-                        const MCAsmLayout &Layout);
-
-  void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags,
-                        uint64_t Address, uint64_t Offset, uint64_t Size,
-                        uint32_t Link, uint32_t Info, uint64_t Alignment,
-                        uint64_t EntrySize);
-
-  void writeRelocations(const MCAssembler &Asm, const MCSectionELF &Sec);
-
-  uint64_t writeObject(MCAssembler &Asm, const MCAsmLayout &Layout);
-  void writeSection(const SectionIndexMapTy &SectionIndexMap,
-                    uint32_t GroupSymbolIndex, uint64_t Offset, uint64_t Size,
-                    const MCSectionELF &Section);
-};
-
-class ELFObjectWriter : public MCObjectWriter {
-  /// The target specific ELF writer instance.
-  std::unique_ptr<MCELFObjectTargetWriter> TargetObjectWriter;
-
-  DenseMap<const MCSectionELF *, std::vector<ELFRelocationEntry>> Relocations;
-
-  DenseMap<const MCSymbolELF *, const MCSymbolELF *> Renames;
-
-  bool EmitAddrsigSection = false;
-  std::vector<const MCSymbol *> AddrsigSyms;
-
-  bool hasRelocationAddend() const;
-
-  bool shouldRelocateWithSymbol(const MCAssembler &Asm,
-                                const MCSymbolRefExpr *RefA,
-                                const MCSymbolELF *Sym, uint64_t C,
-                                unsigned Type) const;
-
-public:
-  ELFObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW)
-      : TargetObjectWriter(std::move(MOTW)) {}
-
-  void reset() override {
-    Relocations.clear();
-    Renames.clear();
-    MCObjectWriter::reset();
-  }
-
-  bool isSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
-                                              const MCSymbol &SymA,
-                                              const MCFragment &FB, bool InSet,
-                                              bool IsPCRel) const override;
-
-  virtual bool checkRelocation(MCContext &Ctx, SMLoc Loc,
-                               const MCSectionELF *From,
-                               const MCSectionELF *To) {
-    return true;
-  }
-
-  void recordRelocation(MCAssembler &Asm, const MCAsmLayout &Layout,
-                        const MCFragment *Fragment, const MCFixup &Fixup,
-                        MCValue Target, uint64_t &FixedValue) override;
-
-  void executePostLayoutBinding(MCAssembler &Asm,
-                                const MCAsmLayout &Layout) override;
-
-  void emitAddrsigSection() override { EmitAddrsigSection = true; }
-  void addAddrsigSymbol(const MCSymbol *Sym) override {
-    AddrsigSyms.push_back(Sym);
-  }
-
-  friend struct ELFWriter;
-};
-
-class ELFSingleObjectWriter : public ELFObjectWriter {
-  raw_pwrite_stream &OS;
-  bool IsLittleEndian;
-
-public:
-  ELFSingleObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
-                        raw_pwrite_stream &OS, bool IsLittleEndian)
-      : ELFObjectWriter(std::move(MOTW)), OS(OS),
-        IsLittleEndian(IsLittleEndian) {}
-
-  uint64_t writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override {
-    return ELFWriter(*this, OS, IsLittleEndian, ELFWriter::AllSections)
-        .writeObject(Asm, Layout);
-  }
-
-  friend struct ELFWriter;
-};
-
-class ELFDwoObjectWriter : public ELFObjectWriter {
-  raw_pwrite_stream &OS, &DwoOS;
-  bool IsLittleEndian;
-
-public:
-  ELFDwoObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
-                     raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS,
-                     bool IsLittleEndian)
-      : ELFObjectWriter(std::move(MOTW)), OS(OS), DwoOS(DwoOS),
-        IsLittleEndian(IsLittleEndian) {}
-
-  virtual bool checkRelocation(MCContext &Ctx, SMLoc Loc,
-                               const MCSectionELF *From,
-                               const MCSectionELF *To) override {
-    if (isDwoSection(*From)) {
-      Ctx.reportError(Loc, "A dwo section may not contain relocations");
-      return false;
-    }
-    if (To && isDwoSection(*To)) {
-      Ctx.reportError(Loc, "A relocation may not refer to a dwo section");
-      return false;
-    }
-    return true;
-  }
-
-  uint64_t writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override {
-    uint64_t Size = ELFWriter(*this, OS, IsLittleEndian, ELFWriter::NonDwoOnly)
-                        .writeObject(Asm, Layout);
-    Size += ELFWriter(*this, DwoOS, IsLittleEndian, ELFWriter::DwoOnly)
-                .writeObject(Asm, Layout);
-    return Size;
-  }
-};
-
-} // end anonymous namespace
-
-void ELFWriter::align(unsigned Alignment) {
-  uint64_t Padding = OffsetToAlignment(W.OS.tell(), Alignment);
-  W.OS.write_zeros(Padding);
-}
-
-unsigned ELFWriter::addToSectionTable(const MCSectionELF *Sec) {
-  SectionTable.push_back(Sec);
-  StrTabBuilder.add(Sec->getSectionName());
-  return SectionTable.size();
-}
-
-void SymbolTableWriter::createSymtabShndx() {
-  if (!ShndxIndexes.empty())
-    return;
-
-  ShndxIndexes.resize(NumWritten);
-}
-
-template <typename T> void SymbolTableWriter::write(T Value) {
-  EWriter.write(Value);
-}
-
-SymbolTableWriter::SymbolTableWriter(ELFWriter &EWriter, bool Is64Bit)
-    : EWriter(EWriter), Is64Bit(Is64Bit), NumWritten(0) {}
-
-void SymbolTableWriter::writeSymbol(uint32_t name, uint8_t info, uint64_t value,
-                                    uint64_t size, uint8_t other,
-                                    uint32_t shndx, bool Reserved) {
-  bool LargeIndex = shndx >= ELF::SHN_LORESERVE && !Reserved;
-
-  if (LargeIndex)
-    createSymtabShndx();
-
-  if (!ShndxIndexes.empty()) {
-    if (LargeIndex)
-      ShndxIndexes.push_back(shndx);
-    else
-      ShndxIndexes.push_back(0);
-  }
-
-  uint16_t Index = LargeIndex ? uint16_t(ELF::SHN_XINDEX) : shndx;
-
-  if (Is64Bit) {
-    write(name);  // st_name
-    write(info);  // st_info
-    write(other); // st_other
-    write(Index); // st_shndx
-    write(value); // st_value
-    write(size);  // st_size
-  } else {
-    write(name);            // st_name
-    write(uint32_t(value)); // st_value
-    write(uint32_t(size));  // st_size
-    write(info);            // st_info
-    write(other);           // st_other
-    write(Index);           // st_shndx
-  }
-
-  ++NumWritten;
-}
-
-bool ELFWriter::is64Bit() const {
-  return OWriter.TargetObjectWriter->is64Bit();
-}
-
-bool ELFWriter::hasRelocationAddend() const {
-  return OWriter.hasRelocationAddend();
-}
-
-// Emit the ELF header.
-void ELFWriter::writeHeader(const MCAssembler &Asm) {
-  // ELF Header
-  // ----------
-  //
-  // Note
-  // ----
-  // emitWord method behaves differently for ELF32 and ELF64, writing
-  // 4 bytes in the former and 8 in the latter.
-
-  W.OS << ELF::ElfMagic; // e_ident[EI_MAG0] to e_ident[EI_MAG3]
-
-  W.OS << char(is64Bit() ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS]
-
-  // e_ident[EI_DATA]
-  W.OS << char(W.Endian == support::little ? ELF::ELFDATA2LSB
-                                           : ELF::ELFDATA2MSB);
-
-  W.OS << char(ELF::EV_CURRENT);        // e_ident[EI_VERSION]
-  // e_ident[EI_OSABI]
-  W.OS << char(OWriter.TargetObjectWriter->getOSABI());
-  W.OS << char(0);                  // e_ident[EI_ABIVERSION]
-
-  W.OS.write_zeros(ELF::EI_NIDENT - ELF::EI_PAD);
-
-  W.write<uint16_t>(ELF::ET_REL);             // e_type
-
-  W.write<uint16_t>(OWriter.TargetObjectWriter->getEMachine()); // e_machine = target
-
-  W.write<uint32_t>(ELF::EV_CURRENT);         // e_version
-  WriteWord(0);                    // e_entry, no entry point in .o file
-  WriteWord(0);                    // e_phoff, no program header for .o
-  WriteWord(0);                     // e_shoff = sec hdr table off in bytes
-
-  // e_flags = whatever the target wants
-  W.write<uint32_t>(Asm.getELFHeaderEFlags());
-
-  // e_ehsize = ELF header size
-  W.write<uint16_t>(is64Bit() ? sizeof(ELF::Elf64_Ehdr)
-                              : sizeof(ELF::Elf32_Ehdr));
-
-  W.write<uint16_t>(0);                  // e_phentsize = prog header entry size
-  W.write<uint16_t>(0);                  // e_phnum = # prog header entries = 0
-
-  // e_shentsize = Section header entry size
-  W.write<uint16_t>(is64Bit() ? sizeof(ELF::Elf64_Shdr)
-                              : sizeof(ELF::Elf32_Shdr));
-
-  // e_shnum     = # of section header ents
-  W.write<uint16_t>(0);
-
-  // e_shstrndx  = Section # of '.shstrtab'
-  assert(StringTableIndex < ELF::SHN_LORESERVE);
-  W.write<uint16_t>(StringTableIndex);
-}
-
-uint64_t ELFWriter::SymbolValue(const MCSymbol &Sym,
-                                const MCAsmLayout &Layout) {
-  if (Sym.isCommon() && Sym.isExternal())
-    return Sym.getCommonAlignment();
-
-  uint64_t Res;
-  if (!Layout.getSymbolOffset(Sym, Res))
-    return 0;
-
-  if (Layout.getAssembler().isThumbFunc(&Sym))
-    Res |= 1;
-
-  return Res;
-}
-
-static uint8_t mergeTypeForSet(uint8_t origType, uint8_t newType) {
-  uint8_t Type = newType;
-
-  // Propagation rules:
-  // IFUNC > FUNC > OBJECT > NOTYPE
-  // TLS_OBJECT > OBJECT > NOTYPE
-  //
-  // dont let the new type degrade the old type
-  switch (origType) {
-  default:
-    break;
-  case ELF::STT_GNU_IFUNC:
-    if (Type == ELF::STT_FUNC || Type == ELF::STT_OBJECT ||
-        Type == ELF::STT_NOTYPE || Type == ELF::STT_TLS)
-      Type = ELF::STT_GNU_IFUNC;
-    break;
-  case ELF::STT_FUNC:
-    if (Type == ELF::STT_OBJECT || Type == ELF::STT_NOTYPE ||
-        Type == ELF::STT_TLS)
-      Type = ELF::STT_FUNC;
-    break;
-  case ELF::STT_OBJECT:
-    if (Type == ELF::STT_NOTYPE)
-      Type = ELF::STT_OBJECT;
-    break;
-  case ELF::STT_TLS:
-    if (Type == ELF::STT_OBJECT || Type == ELF::STT_NOTYPE ||
-        Type == ELF::STT_GNU_IFUNC || Type == ELF::STT_FUNC)
-      Type = ELF::STT_TLS;
-    break;
-  }
-
-  return Type;
-}
-
-void ELFWriter::writeSymbol(SymbolTableWriter &Writer, uint32_t StringIndex,
-                            ELFSymbolData &MSD, const MCAsmLayout &Layout) {
-  const auto &Symbol = cast<MCSymbolELF>(*MSD.Symbol);
-  const MCSymbolELF *Base =
-      cast_or_null<MCSymbolELF>(Layout.getBaseSymbol(Symbol));
-
-  // This has to be in sync with when computeSymbolTable uses SHN_ABS or
-  // SHN_COMMON.
-  bool IsReserved = !Base || Symbol.isCommon();
-
-  // Binding and Type share the same byte as upper and lower nibbles
-  uint8_t Binding = Symbol.getBinding();
-  uint8_t Type = Symbol.getType();
-  if (Base) {
-    Type = mergeTypeForSet(Type, Base->getType());
-  }
-  uint8_t Info = (Binding << 4) | Type;
-
-  // Other and Visibility share the same byte with Visibility using the lower
-  // 2 bits
-  uint8_t Visibility = Symbol.getVisibility();
-  uint8_t Other = Symbol.getOther() | Visibility;
-
-  uint64_t Value = SymbolValue(*MSD.Symbol, Layout);
-  uint64_t Size = 0;
-
-  const MCExpr *ESize = MSD.Symbol->getSize();
-  if (!ESize && Base)
-    ESize = Base->getSize();
-
-  if (ESize) {
-    int64_t Res;
-    if (!ESize->evaluateKnownAbsolute(Res, Layout))
-      report_fatal_error("Size expression must be absolute.");
-    Size = Res;
-  }
-
-  // Write out the symbol table entry
-  Writer.writeSymbol(StringIndex, Info, Value, Size, Other, MSD.SectionIndex,
-                     IsReserved);
-}
-
-// True if the assembler knows nothing about the final value of the symbol.
-// This doesn't cover the comdat issues, since in those cases the assembler
-// can at least know that all symbols in the section will move together.
-static bool isWeak(const MCSymbolELF &Sym) {
-  if (Sym.getType() == ELF::STT_GNU_IFUNC)
-    return true;
-
-  switch (Sym.getBinding()) {
-  default:
-    llvm_unreachable("Unknown binding");
-  case ELF::STB_LOCAL:
-    return false;
-  case ELF::STB_GLOBAL:
-    return false;
-  case ELF::STB_WEAK:
-  case ELF::STB_GNU_UNIQUE:
-    return true;
-  }
-}
-
-bool ELFWriter::isInSymtab(const MCAsmLayout &Layout, const MCSymbolELF &Symbol,
-                           bool Used, bool Renamed) {
-  if (Symbol.isVariable()) {
-    const MCExpr *Expr = Symbol.getVariableValue();
-    if (const MCSymbolRefExpr *Ref = dyn_cast<MCSymbolRefExpr>(Expr)) {
-      if (Ref->getKind() == MCSymbolRefExpr::VK_WEAKREF)
-        return false;
-    }
-  }
-
-  if (Used)
-    return true;
-
-  if (Renamed)
-    return false;
-
-  if (Symbol.isVariable() && Symbol.isUndefined()) {
-    // FIXME: this is here just to diagnose the case of a var = commmon_sym.
-    Layout.getBaseSymbol(Symbol);
-    return false;
-  }
-
-  if (Symbol.isUndefined() && !Symbol.isBindingSet())
-    return false;
-
-  if (Symbol.isTemporary())
-    return false;
-
-  if (Symbol.getType() == ELF::STT_SECTION)
-    return false;
-
-  return true;
-}
-
-void ELFWriter::computeSymbolTable(
-    MCAssembler &Asm, const MCAsmLayout &Layout,
-    const SectionIndexMapTy &SectionIndexMap, const RevGroupMapTy &RevGroupMap,
-    SectionOffsetsTy &SectionOffsets) {
-  MCContext &Ctx = Asm.getContext();
-  SymbolTableWriter Writer(*this, is64Bit());
-
-  // Symbol table
-  unsigned EntrySize = is64Bit() ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32;
-  MCSectionELF *SymtabSection =
-      Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, EntrySize, "");
-  SymtabSection->setAlignment(is64Bit() ? 8 : 4);
-  SymbolTableIndex = addToSectionTable(SymtabSection);
-
-  align(SymtabSection->getAlignment());
-  uint64_t SecStart = W.OS.tell();
-
-  // The first entry is the undefined symbol entry.
-  Writer.writeSymbol(0, 0, 0, 0, 0, 0, false);
-
-  std::vector<ELFSymbolData> LocalSymbolData;
-  std::vector<ELFSymbolData> ExternalSymbolData;
-
-  // Add the data for the symbols.
-  bool HasLargeSectionIndex = false;
-  for (const MCSymbol &S : Asm.symbols()) {
-    const auto &Symbol = cast<MCSymbolELF>(S);
-    bool Used = Symbol.isUsedInReloc();
-    bool WeakrefUsed = Symbol.isWeakrefUsedInReloc();
-    bool isSignature = Symbol.isSignature();
-
-    if (!isInSymtab(Layout, Symbol, Used || WeakrefUsed || isSignature,
-                    OWriter.Renames.count(&Symbol)))
-      continue;
-
-    if (Symbol.isTemporary() && Symbol.isUndefined()) {
-      Ctx.reportError(SMLoc(), "Undefined temporary symbol");
-      continue;
-    }
-
-    ELFSymbolData MSD;
-    MSD.Symbol = cast<MCSymbolELF>(&Symbol);
-
-    bool Local = Symbol.getBinding() == ELF::STB_LOCAL;
-    assert(Local || !Symbol.isTemporary());
-
-    if (Symbol.isAbsolute()) {
-      MSD.SectionIndex = ELF::SHN_ABS;
-    } else if (Symbol.isCommon()) {
-      assert(!Local);
-      MSD.SectionIndex = ELF::SHN_COMMON;
-    } else if (Symbol.isUndefined()) {
-      if (isSignature && !Used) {
-        MSD.SectionIndex = RevGroupMap.lookup(&Symbol);
-        if (MSD.SectionIndex >= ELF::SHN_LORESERVE)
-          HasLargeSectionIndex = true;
-      } else {
-        MSD.SectionIndex = ELF::SHN_UNDEF;
-      }
-    } else {
-      const MCSectionELF &Section =
-          static_cast<const MCSectionELF &>(Symbol.getSection());
-
-      // We may end up with a situation when section symbol is technically
-      // defined, but should not be. That happens because we explicitly
-      // pre-create few .debug_* sections to have accessors.
-      // And if these sections were not really defined in the code, but were
-      // referenced, we simply error out.
-      if (!Section.isRegistered()) {
-        assert(static_cast<const MCSymbolELF &>(Symbol).getType() ==
-               ELF::STT_SECTION);
-        Ctx.reportError(SMLoc(),
-                        "Undefined section reference: " + Symbol.getName());
-        continue;
-      }
-
-      if (Mode == NonDwoOnly && isDwoSection(Section))
-        continue;
-      MSD.SectionIndex = SectionIndexMap.lookup(&Section);
-      assert(MSD.SectionIndex && "Invalid section index!");
-      if (MSD.SectionIndex >= ELF::SHN_LORESERVE)
-        HasLargeSectionIndex = true;
-    }
-
-    StringRef Name = Symbol.getName();
-
-    // Sections have their own string table
-    if (Symbol.getType() != ELF::STT_SECTION) {
-      MSD.Name = Name;
-      StrTabBuilder.add(Name);
-    }
-
-    if (Local)
-      LocalSymbolData.push_back(MSD);
-    else
-      ExternalSymbolData.push_back(MSD);
-  }
-
-  // This holds the .symtab_shndx section index.
-  unsigned SymtabShndxSectionIndex = 0;
-
-  if (HasLargeSectionIndex) {
-    MCSectionELF *SymtabShndxSection =
-        Ctx.getELFSection(".symtab_shndxr", ELF::SHT_SYMTAB_SHNDX, 0, 4, "");
-    SymtabShndxSectionIndex = addToSectionTable(SymtabShndxSection);
-    SymtabShndxSection->setAlignment(4);
-  }
-
-  ArrayRef<std::string> FileNames = Asm.getFileNames();
-  for (const std::string &Name : FileNames)
-    StrTabBuilder.add(Name);
-
-  StrTabBuilder.finalize();
-
-  // File symbols are emitted first and handled separately from normal symbols,
-  // i.e. a non-STT_FILE symbol with the same name may appear.
-  for (const std::string &Name : FileNames)
-    Writer.writeSymbol(StrTabBuilder.getOffset(Name),
-                       ELF::STT_FILE | ELF::STB_LOCAL, 0, 0, ELF::STV_DEFAULT,
-                       ELF::SHN_ABS, true);
-
-  // Symbols are required to be in lexicographic order.
-  array_pod_sort(LocalSymbolData.begin(), LocalSymbolData.end());
-  array_pod_sort(ExternalSymbolData.begin(), ExternalSymbolData.end());
-
-  // Set the symbol indices. Local symbols must come before all other
-  // symbols with non-local bindings.
-  unsigned Index = FileNames.size() + 1;
-
-  for (ELFSymbolData &MSD : LocalSymbolData) {
-    unsigned StringIndex = MSD.Symbol->getType() == ELF::STT_SECTION
-                               ? 0
-                               : StrTabBuilder.getOffset(MSD.Name);
-    MSD.Symbol->setIndex(Index++);
-    writeSymbol(Writer, StringIndex, MSD, Layout);
-  }
-
-  // Write the symbol table entries.
-  LastLocalSymbolIndex = Index;
-
-  for (ELFSymbolData &MSD : ExternalSymbolData) {
-    unsigned StringIndex = StrTabBuilder.getOffset(MSD.Name);
-    MSD.Symbol->setIndex(Index++);
-    writeSymbol(Writer, StringIndex, MSD, Layout);
-    assert(MSD.Symbol->getBinding() != ELF::STB_LOCAL);
-  }
-
-  uint64_t SecEnd = W.OS.tell();
-  SectionOffsets[SymtabSection] = std::make_pair(SecStart, SecEnd);
-
-  ArrayRef<uint32_t> ShndxIndexes = Writer.getShndxIndexes();
-  if (ShndxIndexes.empty()) {
-    assert(SymtabShndxSectionIndex == 0);
-    return;
-  }
-  assert(SymtabShndxSectionIndex != 0);
-
-  SecStart = W.OS.tell();
-  const MCSectionELF *SymtabShndxSection =
-      SectionTable[SymtabShndxSectionIndex - 1];
-  for (uint32_t Index : ShndxIndexes)
-    write(Index);
-  SecEnd = W.OS.tell();
-  SectionOffsets[SymtabShndxSection] = std::make_pair(SecStart, SecEnd);
-}
-
-void ELFWriter::writeAddrsigSection() {
-  for (const MCSymbol *Sym : OWriter.AddrsigSyms)
-    encodeULEB128(Sym->getIndex(), W.OS);
-}
-
-MCSectionELF *ELFWriter::createRelocationSection(MCContext &Ctx,
-                                                 const MCSectionELF &Sec) {
-  if (OWriter.Relocations[&Sec].empty())
-    return nullptr;
-
-  const StringRef SectionName = Sec.getSectionName();
-  std::string RelaSectionName = hasRelocationAddend() ? ".rela" : ".rel";
-  RelaSectionName += SectionName;
-
-  unsigned EntrySize;
-  if (hasRelocationAddend())
-    EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela);
-  else
-    EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel);
-
-  unsigned Flags = 0;
-  if (Sec.getFlags() & ELF::SHF_GROUP)
-    Flags = ELF::SHF_GROUP;
-
-  MCSectionELF *RelaSection = Ctx.createELFRelSection(
-      RelaSectionName, hasRelocationAddend() ? ELF::SHT_RELA : ELF::SHT_REL,
-      Flags, EntrySize, Sec.getGroup(), &Sec);
-  RelaSection->setAlignment(is64Bit() ? 8 : 4);
-  return RelaSection;
-}
-
-// Include the debug info compression header.
-bool ELFWriter::maybeWriteCompression(
-    uint64_t Size, SmallVectorImpl<char> &CompressedContents, bool ZLibStyle,
-    unsigned Alignment) {
-  if (ZLibStyle) {
-    uint64_t HdrSize =
-        is64Bit() ? sizeof(ELF::Elf32_Chdr) : sizeof(ELF::Elf64_Chdr);
-    if (Size <= HdrSize + CompressedContents.size())
-      return false;
-    // Platform specific header is followed by compressed data.
-    if (is64Bit()) {
-      // Write Elf64_Chdr header.
-      write(static_cast<ELF::Elf64_Word>(ELF::ELFCOMPRESS_ZLIB));
-      write(static_cast<ELF::Elf64_Word>(0)); // ch_reserved field.
-      write(static_cast<ELF::Elf64_Xword>(Size));
-      write(static_cast<ELF::Elf64_Xword>(Alignment));
-    } else {
-      // Write Elf32_Chdr header otherwise.
-      write(static_cast<ELF::Elf32_Word>(ELF::ELFCOMPRESS_ZLIB));
-      write(static_cast<ELF::Elf32_Word>(Size));
-      write(static_cast<ELF::Elf32_Word>(Alignment));
-    }
-    return true;
-  }
-
-  // "ZLIB" followed by 8 bytes representing the uncompressed size of the section,
-  // useful for consumers to preallocate a buffer to decompress into.
-  const StringRef Magic = "ZLIB";
-  if (Size <= Magic.size() + sizeof(Size) + CompressedContents.size())
-    return false;
-  W.OS << Magic;
-  support::endian::write(W.OS, Size, support::big);
-  return true;
-}
-
-void ELFWriter::writeSectionData(const MCAssembler &Asm, MCSection &Sec,
-                                 const MCAsmLayout &Layout) {
-  MCSectionELF &Section = static_cast<MCSectionELF &>(Sec);
-  StringRef SectionName = Section.getSectionName();
-
-  auto &MC = Asm.getContext();
-  const auto &MAI = MC.getAsmInfo();
-
-  // Compressing debug_frame requires handling alignment fragments which is
-  // more work (possibly generalizing MCAssembler.cpp:writeFragment to allow
-  // for writing to arbitrary buffers) for little benefit.
-  bool CompressionEnabled =
-      MAI->compressDebugSections() != DebugCompressionType::None;
-  if (!CompressionEnabled || !SectionName.startswith(".debug_") ||
-      SectionName == ".debug_frame") {
-    Asm.writeSectionData(W.OS, &Section, Layout);
-    return;
-  }
-
-  assert((MAI->compressDebugSections() == DebugCompressionType::Z ||
-          MAI->compressDebugSections() == DebugCompressionType::GNU) &&
-         "expected zlib or zlib-gnu style compression");
-
-  SmallVector<char, 128> UncompressedData;
-  raw_svector_ostream VecOS(UncompressedData);
-  Asm.writeSectionData(VecOS, &Section, Layout);
-
-  SmallVector<char, 128> CompressedContents;
-  if (Error E = zlib::compress(
-          StringRef(UncompressedData.data(), UncompressedData.size()),
-          CompressedContents)) {
-    consumeError(std::move(E));
-    W.OS << UncompressedData;
-    return;
-  }
-
-  bool ZlibStyle = MAI->compressDebugSections() == DebugCompressionType::Z;
-  if (!maybeWriteCompression(UncompressedData.size(), CompressedContents,
-                             ZlibStyle, Sec.getAlignment())) {
-    W.OS << UncompressedData;
-    return;
-  }
-
-  if (ZlibStyle)
-    // Set the compressed flag. That is zlib style.
-    Section.setFlags(Section.getFlags() | ELF::SHF_COMPRESSED);
-  else
-    // Add "z" prefix to section name. This is zlib-gnu style.
-    MC.renameELFSection(&Section, (".z" + SectionName.drop_front(1)).str());
-  W.OS << CompressedContents;
-}
-
-void ELFWriter::WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags,
-                                 uint64_t Address, uint64_t Offset,
-                                 uint64_t Size, uint32_t Link, uint32_t Info,
-                                 uint64_t Alignment, uint64_t EntrySize) {
-  W.write<uint32_t>(Name);        // sh_name: index into string table
-  W.write<uint32_t>(Type);        // sh_type
-  WriteWord(Flags);     // sh_flags
-  WriteWord(Address);   // sh_addr
-  WriteWord(Offset);    // sh_offset
-  WriteWord(Size);      // sh_size
-  W.write<uint32_t>(Link);        // sh_link
-  W.write<uint32_t>(Info);        // sh_info
-  WriteWord(Alignment); // sh_addralign
-  WriteWord(EntrySize); // sh_entsize
-}
-
-void ELFWriter::writeRelocations(const MCAssembler &Asm,
-                                       const MCSectionELF &Sec) {
-  std::vector<ELFRelocationEntry> &Relocs = OWriter.Relocations[&Sec];
-
-  // We record relocations by pushing to the end of a vector. Reverse the vector
-  // to get the relocations in the order they were created.
-  // In most cases that is not important, but it can be for special sections
-  // (.eh_frame) or specific relocations (TLS optimizations on SystemZ).
-  std::reverse(Relocs.begin(), Relocs.end());
-
-  // Sort the relocation entries. MIPS needs this.
-  OWriter.TargetObjectWriter->sortRelocs(Asm, Relocs);
-
-  for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
-    const ELFRelocationEntry &Entry = Relocs[e - i - 1];
-    unsigned Index = Entry.Symbol ? Entry.Symbol->getIndex() : 0;
-
-    if (is64Bit()) {
-      write(Entry.Offset);
-      if (OWriter.TargetObjectWriter->getEMachine() == ELF::EM_MIPS) {
-        write(uint32_t(Index));
-
-        write(OWriter.TargetObjectWriter->getRSsym(Entry.Type));
-        write(OWriter.TargetObjectWriter->getRType3(Entry.Type));
-        write(OWriter.TargetObjectWriter->getRType2(Entry.Type));
-        write(OWriter.TargetObjectWriter->getRType(Entry.Type));
-      } else {
-        struct ELF::Elf64_Rela ERE64;
-        ERE64.setSymbolAndType(Index, Entry.Type);
-        write(ERE64.r_info);
-      }
-      if (hasRelocationAddend())
-        write(Entry.Addend);
-    } else {
-      write(uint32_t(Entry.Offset));
-
-      struct ELF::Elf32_Rela ERE32;
-      ERE32.setSymbolAndType(Index, Entry.Type);
-      write(ERE32.r_info);
-
-      if (hasRelocationAddend())
-        write(uint32_t(Entry.Addend));
-
-      if (OWriter.TargetObjectWriter->getEMachine() == ELF::EM_MIPS) {
-        if (uint32_t RType =
-                OWriter.TargetObjectWriter->getRType2(Entry.Type)) {
-          write(uint32_t(Entry.Offset));
-
-          ERE32.setSymbolAndType(0, RType);
-          write(ERE32.r_info);
-          write(uint32_t(0));
-        }
-        if (uint32_t RType =
-                OWriter.TargetObjectWriter->getRType3(Entry.Type)) {
-          write(uint32_t(Entry.Offset));
-
-          ERE32.setSymbolAndType(0, RType);
-          write(ERE32.r_info);
-          write(uint32_t(0));
-        }
-      }
-    }
-  }
-}
-
-const MCSectionELF *ELFWriter::createStringTable(MCContext &Ctx) {
-  const MCSectionELF *StrtabSection = SectionTable[StringTableIndex - 1];
-  StrTabBuilder.write(W.OS);
-  return StrtabSection;
-}
-
-void ELFWriter::writeSection(const SectionIndexMapTy &SectionIndexMap,
-                             uint32_t GroupSymbolIndex, uint64_t Offset,
-                             uint64_t Size, const MCSectionELF &Section) {
-  uint64_t sh_link = 0;
-  uint64_t sh_info = 0;
-
-  switch(Section.getType()) {
-  default:
-    // Nothing to do.
-    break;
-
-  case ELF::SHT_DYNAMIC:
-    llvm_unreachable("SHT_DYNAMIC in a relocatable object");
-
-  case ELF::SHT_REL:
-  case ELF::SHT_RELA: {
-    sh_link = SymbolTableIndex;
-    assert(sh_link && ".symtab not found");
-    const MCSection *InfoSection = Section.getAssociatedSection();
-    sh_info = SectionIndexMap.lookup(cast<MCSectionELF>(InfoSection));
-    break;
-  }
-
-  case ELF::SHT_SYMTAB:
-    sh_link = StringTableIndex;
-    sh_info = LastLocalSymbolIndex;
-    break;
-
-  case ELF::SHT_SYMTAB_SHNDX:
-  case ELF::SHT_LLVM_CALL_GRAPH_PROFILE:
-  case ELF::SHT_LLVM_ADDRSIG:
-    sh_link = SymbolTableIndex;
-    break;
-
-  case ELF::SHT_GROUP:
-    sh_link = SymbolTableIndex;
-    sh_info = GroupSymbolIndex;
-    break;
-  }
-
-  if (Section.getFlags() & ELF::SHF_LINK_ORDER) {
-    const MCSymbol *Sym = Section.getAssociatedSymbol();
-    const MCSectionELF *Sec = cast<MCSectionELF>(&Sym->getSection());
-    sh_link = SectionIndexMap.lookup(Sec);
-  }
-
-  WriteSecHdrEntry(StrTabBuilder.getOffset(Section.getSectionName()),
-                   Section.getType(), Section.getFlags(), 0, Offset, Size,
-                   sh_link, sh_info, Section.getAlignment(),
-                   Section.getEntrySize());
-}
-
-void ELFWriter::writeSectionHeader(
-    const MCAsmLayout &Layout, const SectionIndexMapTy &SectionIndexMap,
-    const SectionOffsetsTy &SectionOffsets) {
-  const unsigned NumSections = SectionTable.size();
-
-  // Null section first.
-  uint64_t FirstSectionSize =
-      (NumSections + 1) >= ELF::SHN_LORESERVE ? NumSections + 1 : 0;
-  WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, 0, 0, 0, 0);
-
-  for (const MCSectionELF *Section : SectionTable) {
-    uint32_t GroupSymbolIndex;
-    unsigned Type = Section->getType();
-    if (Type != ELF::SHT_GROUP)
-      GroupSymbolIndex = 0;
-    else
-      GroupSymbolIndex = Section->getGroup()->getIndex();
-
-    const std::pair<uint64_t, uint64_t> &Offsets =
-        SectionOffsets.find(Section)->second;
-    uint64_t Size;
-    if (Type == ELF::SHT_NOBITS)
-      Size = Layout.getSectionAddressSize(Section);
-    else
-      Size = Offsets.second - Offsets.first;
-
-    writeSection(SectionIndexMap, GroupSymbolIndex, Offsets.first, Size,
-                 *Section);
-  }
-}
-
-uint64_t ELFWriter::writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) {
-  uint64_t StartOffset = W.OS.tell();
-
-  MCContext &Ctx = Asm.getContext();
-  MCSectionELF *StrtabSection =
-      Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0);
-  StringTableIndex = addToSectionTable(StrtabSection);
-
-  RevGroupMapTy RevGroupMap;
-  SectionIndexMapTy SectionIndexMap;
-
-  std::map<const MCSymbol *, std::vector<const MCSectionELF *>> GroupMembers;
-
-  // Write out the ELF header ...
-  writeHeader(Asm);
-
-  // ... then the sections ...
-  SectionOffsetsTy SectionOffsets;
-  std::vector<MCSectionELF *> Groups;
-  std::vector<MCSectionELF *> Relocations;
-  for (MCSection &Sec : Asm) {
-    MCSectionELF &Section = static_cast<MCSectionELF &>(Sec);
-    if (Mode == NonDwoOnly && isDwoSection(Section))
-      continue;
-    if (Mode == DwoOnly && !isDwoSection(Section))
-      continue;
-
-    align(Section.getAlignment());
-
-    // Remember the offset into the file for this section.
-    uint64_t SecStart = W.OS.tell();
-
-    const MCSymbolELF *SignatureSymbol = Section.getGroup();
-    writeSectionData(Asm, Section, Layout);
-
-    uint64_t SecEnd = W.OS.tell();
-    SectionOffsets[&Section] = std::make_pair(SecStart, SecEnd);
-
-    MCSectionELF *RelSection = createRelocationSection(Ctx, Section);
-
-    if (SignatureSymbol) {
-      Asm.registerSymbol(*SignatureSymbol);
-      unsigned &GroupIdx = RevGroupMap[SignatureSymbol];
-      if (!GroupIdx) {
-        MCSectionELF *Group = Ctx.createELFGroupSection(SignatureSymbol);
-        GroupIdx = addToSectionTable(Group);
-        Group->setAlignment(4);
-        Groups.push_back(Group);
-      }
-      std::vector<const MCSectionELF *> &Members =
-          GroupMembers[SignatureSymbol];
-      Members.push_back(&Section);
-      if (RelSection)
-        Members.push_back(RelSection);
-    }
-
-    SectionIndexMap[&Section] = addToSectionTable(&Section);
-    if (RelSection) {
-      SectionIndexMap[RelSection] = addToSectionTable(RelSection);
-      Relocations.push_back(RelSection);
-    }
-
-    OWriter.TargetObjectWriter->addTargetSectionFlags(Ctx, Section);
-  }
-
-  MCSectionELF *CGProfileSection = nullptr;
-  if (!Asm.CGProfile.empty()) {
-    CGProfileSection = Ctx.getELFSection(".llvm.call-graph-profile",
-                                         ELF::SHT_LLVM_CALL_GRAPH_PROFILE,
-                                         ELF::SHF_EXCLUDE, 16, "");
-    SectionIndexMap[CGProfileSection] = addToSectionTable(CGProfileSection);
-  }
-
-  for (MCSectionELF *Group : Groups) {
-    align(Group->getAlignment());
-
-    // Remember the offset into the file for this section.
-    uint64_t SecStart = W.OS.tell();
-
-    const MCSymbol *SignatureSymbol = Group->getGroup();
-    assert(SignatureSymbol);
-    write(uint32_t(ELF::GRP_COMDAT));
-    for (const MCSectionELF *Member : GroupMembers[SignatureSymbol]) {
-      uint32_t SecIndex = SectionIndexMap.lookup(Member);
-      write(SecIndex);
-    }
-
-    uint64_t SecEnd = W.OS.tell();
-    SectionOffsets[Group] = std::make_pair(SecStart, SecEnd);
-  }
-
-  if (Mode == DwoOnly) {
-    // dwo files don't have symbol tables or relocations, but they do have
-    // string tables.
-    StrTabBuilder.finalize();
-  } else {
-    MCSectionELF *AddrsigSection;
-    if (OWriter.EmitAddrsigSection) {
-      AddrsigSection = Ctx.getELFSection(".llvm_addrsig", ELF::SHT_LLVM_ADDRSIG,
-                                         ELF::SHF_EXCLUDE);
-      addToSectionTable(AddrsigSection);
-    }
-
-    // Compute symbol table information.
-    computeSymbolTable(Asm, Layout, SectionIndexMap, RevGroupMap,
-                       SectionOffsets);
-
-    for (MCSectionELF *RelSection : Relocations) {
-      align(RelSection->getAlignment());
-
-      // Remember the offset into the file for this section.
-      uint64_t SecStart = W.OS.tell();
-
-      writeRelocations(Asm,
-                       cast<MCSectionELF>(*RelSection->getAssociatedSection()));
-
-      uint64_t SecEnd = W.OS.tell();
-      SectionOffsets[RelSection] = std::make_pair(SecStart, SecEnd);
-    }
-
-    if (OWriter.EmitAddrsigSection) {
-      uint64_t SecStart = W.OS.tell();
-      writeAddrsigSection();
-      uint64_t SecEnd = W.OS.tell();
-      SectionOffsets[AddrsigSection] = std::make_pair(SecStart, SecEnd);
-    }
-  }
-
-  if (CGProfileSection) {
-    uint64_t SecStart = W.OS.tell();
-    for (const MCAssembler::CGProfileEntry &CGPE : Asm.CGProfile) {
-      W.write<uint32_t>(CGPE.From->getSymbol().getIndex());
-      W.write<uint32_t>(CGPE.To->getSymbol().getIndex());
-      W.write<uint64_t>(CGPE.Count);
-    }
-    uint64_t SecEnd = W.OS.tell();
-    SectionOffsets[CGProfileSection] = std::make_pair(SecStart, SecEnd);
-  }
-
-  {
-    uint64_t SecStart = W.OS.tell();
-    const MCSectionELF *Sec = createStringTable(Ctx);
-    uint64_t SecEnd = W.OS.tell();
-    SectionOffsets[Sec] = std::make_pair(SecStart, SecEnd);
-  }
-
-  uint64_t NaturalAlignment = is64Bit() ? 8 : 4;
-  align(NaturalAlignment);
-
-  const uint64_t SectionHeaderOffset = W.OS.tell();
-
-  // ... then the section header table ...
-  writeSectionHeader(Layout, SectionIndexMap, SectionOffsets);
-
-  uint16_t NumSections = support::endian::byte_swap<uint16_t>(
-      (SectionTable.size() + 1 >= ELF::SHN_LORESERVE) ? (uint16_t)ELF::SHN_UNDEF
-                                                      : SectionTable.size() + 1,
-      W.Endian);
-  unsigned NumSectionsOffset;
-
-  auto &Stream = static_cast<raw_pwrite_stream &>(W.OS);
-  if (is64Bit()) {
-    uint64_t Val =
-        support::endian::byte_swap<uint64_t>(SectionHeaderOffset, W.Endian);
-    Stream.pwrite(reinterpret_cast<char *>(&Val), sizeof(Val),
-                  offsetof(ELF::Elf64_Ehdr, e_shoff));
-    NumSectionsOffset = offsetof(ELF::Elf64_Ehdr, e_shnum);
-  } else {
-    uint32_t Val =
-        support::endian::byte_swap<uint32_t>(SectionHeaderOffset, W.Endian);
-    Stream.pwrite(reinterpret_cast<char *>(&Val), sizeof(Val),
-                  offsetof(ELF::Elf32_Ehdr, e_shoff));
-    NumSectionsOffset = offsetof(ELF::Elf32_Ehdr, e_shnum);
-  }
-  Stream.pwrite(reinterpret_cast<char *>(&NumSections), sizeof(NumSections),
-                NumSectionsOffset);
-
-  return W.OS.tell() - StartOffset;
-}
-
-bool ELFObjectWriter::hasRelocationAddend() const {
-  return TargetObjectWriter->hasRelocationAddend();
-}
-
-void ELFObjectWriter::executePostLayoutBinding(MCAssembler &Asm,
-                                               const MCAsmLayout &Layout) {
-  // The presence of symbol versions causes undefined symbols and
-  // versions declared with @@@ to be renamed.
-  for (const std::pair<StringRef, const MCSymbol *> &P : Asm.Symvers) {
-    StringRef AliasName = P.first;
-    const auto &Symbol = cast<MCSymbolELF>(*P.second);
-    size_t Pos = AliasName.find('@');
-    assert(Pos != StringRef::npos);
-
-    StringRef Prefix = AliasName.substr(0, Pos);
-    StringRef Rest = AliasName.substr(Pos);
-    StringRef Tail = Rest;
-    if (Rest.startswith("@@@"))
-      Tail = Rest.substr(Symbol.isUndefined() ? 2 : 1);
-
-    auto *Alias =
-        cast<MCSymbolELF>(Asm.getContext().getOrCreateSymbol(Prefix + Tail));
-    Asm.registerSymbol(*Alias);
-    const MCExpr *Value = MCSymbolRefExpr::create(&Symbol, Asm.getContext());
-    Alias->setVariableValue(Value);
-
-    // Aliases defined with .symvar copy the binding from the symbol they alias.
-    // This is the first place we are able to copy this information.
-    Alias->setExternal(Symbol.isExternal());
-    Alias->setBinding(Symbol.getBinding());
-    Alias->setOther(Symbol.getOther());
-
-    if (!Symbol.isUndefined() && !Rest.startswith("@@@"))
-      continue;
-
-    // FIXME: Get source locations for these errors or diagnose them earlier.
-    if (Symbol.isUndefined() && Rest.startswith("@@") &&
-        !Rest.startswith("@@@")) {
-      Asm.getContext().reportError(SMLoc(), "versioned symbol " + AliasName +
-                                                " must be defined");
-      continue;
-    }
-
-    if (Renames.count(&Symbol) && Renames[&Symbol] != Alias) {
-      Asm.getContext().reportError(
-          SMLoc(), llvm::Twine("multiple symbol versions defined for ") +
-                       Symbol.getName());
-      continue;
-    }
-
-    Renames.insert(std::make_pair(&Symbol, Alias));
-  }
-
-  for (const MCSymbol *&Sym : AddrsigSyms) {
-    if (const MCSymbol *R = Renames.lookup(cast<MCSymbolELF>(Sym)))
-      Sym = R;
-    if (Sym->isInSection() && Sym->getName().startswith(".L"))
-      Sym = Sym->getSection().getBeginSymbol();
-    Sym->setUsedInReloc();
-  }
-}
-
-// It is always valid to create a relocation with a symbol. It is preferable
-// to use a relocation with a section if that is possible. Using the section
-// allows us to omit some local symbols from the symbol table.
-bool ELFObjectWriter::shouldRelocateWithSymbol(const MCAssembler &Asm,
-                                               const MCSymbolRefExpr *RefA,
-                                               const MCSymbolELF *Sym,
-                                               uint64_t C,
-                                               unsigned Type) const {
-  // A PCRel relocation to an absolute value has no symbol (or section). We
-  // represent that with a relocation to a null section.
-  if (!RefA)
-    return false;
-
-  MCSymbolRefExpr::VariantKind Kind = RefA->getKind();
-  switch (Kind) {
-  default:
-    break;
-  // The .odp creation emits a relocation against the symbol ".TOC." which
-  // create a R_PPC64_TOC relocation. However the relocation symbol name
-  // in final object creation should be NULL, since the symbol does not
-  // really exist, it is just the reference to TOC base for the current
-  // object file. Since the symbol is undefined, returning false results
-  // in a relocation with a null section which is the desired result.
-  case MCSymbolRefExpr::VK_PPC_TOCBASE:
-    return false;
-
-  // These VariantKind cause the relocation to refer to something other than
-  // the symbol itself, like a linker generated table. Since the address of
-  // symbol is not relevant, we cannot replace the symbol with the
-  // section and patch the difference in the addend.
-  case MCSymbolRefExpr::VK_GOT:
-  case MCSymbolRefExpr::VK_PLT:
-  case MCSymbolRefExpr::VK_GOTPCREL:
-  case MCSymbolRefExpr::VK_PPC_GOT_LO:
-  case MCSymbolRefExpr::VK_PPC_GOT_HI:
-  case MCSymbolRefExpr::VK_PPC_GOT_HA:
-    return true;
-  }
-
-  // An undefined symbol is not in any section, so the relocation has to point
-  // to the symbol itself.
-  assert(Sym && "Expected a symbol");
-  if (Sym->isUndefined())
-    return true;
-
-  unsigned Binding = Sym->getBinding();
-  switch(Binding) {
-  default:
-    llvm_unreachable("Invalid Binding");
-  case ELF::STB_LOCAL:
-    break;
-  case ELF::STB_WEAK:
-    // If the symbol is weak, it might be overridden by a symbol in another
-    // file. The relocation has to point to the symbol so that the linker
-    // can update it.
-    return true;
-  case ELF::STB_GLOBAL:
-    // Global ELF symbols can be preempted by the dynamic linker. The relocation
-    // has to point to the symbol for a reason analogous to the STB_WEAK case.
-    return true;
-  }
-
-  // If a relocation points to a mergeable section, we have to be careful.
-  // If the offset is zero, a relocation with the section will encode the
-  // same information. With a non-zero offset, the situation is different.
-  // For example, a relocation can point 42 bytes past the end of a string.
-  // If we change such a relocation to use the section, the linker would think
-  // that it pointed to another string and subtracting 42 at runtime will
-  // produce the wrong value.
-  if (Sym->isInSection()) {
-    auto &Sec = cast<MCSectionELF>(Sym->getSection());
-    unsigned Flags = Sec.getFlags();
-    if (Flags & ELF::SHF_MERGE) {
-      if (C != 0)
-        return true;
-
-      // It looks like gold has a bug (http://sourceware.org/PR16794) and can
-      // only handle section relocations to mergeable sections if using RELA.
-      if (!hasRelocationAddend())
-        return true;
-    }
-
-    // Most TLS relocations use a got, so they need the symbol. Even those that
-    // are just an offset (@tpoff), require a symbol in gold versions before
-    // 5efeedf61e4fe720fd3e9a08e6c91c10abb66d42 (2014-09-26) which fixed
-    // http://sourceware.org/PR16773.
-    if (Flags & ELF::SHF_TLS)
-      return true;
-  }
-
-  // If the symbol is a thumb function the final relocation must set the lowest
-  // bit. With a symbol that is done by just having the symbol have that bit
-  // set, so we would lose the bit if we relocated with the section.
-  // FIXME: We could use the section but add the bit to the relocation value.
-  if (Asm.isThumbFunc(Sym))
-    return true;
-
-  if (TargetObjectWriter->needsRelocateWithSymbol(*Sym, Type))
-    return true;
-  return false;
-}
-
-void ELFObjectWriter::recordRelocation(MCAssembler &Asm,
-                                       const MCAsmLayout &Layout,
-                                       const MCFragment *Fragment,
-                                       const MCFixup &Fixup, MCValue Target,
-                                       uint64_t &FixedValue) {
-  MCAsmBackend &Backend = Asm.getBackend();
-  bool IsPCRel = Backend.getFixupKindInfo(Fixup.getKind()).Flags &
-                 MCFixupKindInfo::FKF_IsPCRel;
-  const MCSectionELF &FixupSection = cast<MCSectionELF>(*Fragment->getParent());
-  uint64_t C = Target.getConstant();
-  uint64_t FixupOffset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
-  MCContext &Ctx = Asm.getContext();
-
-  if (const MCSymbolRefExpr *RefB = Target.getSymB()) {
-    // Let A, B and C being the components of Target and R be the location of
-    // the fixup. If the fixup is not pcrel, we want to compute (A - B + C).
-    // If it is pcrel, we want to compute (A - B + C - R).
-
-    // In general, ELF has no relocations for -B. It can only represent (A + C)
-    // or (A + C - R). If B = R + K and the relocation is not pcrel, we can
-    // replace B to implement it: (A - R - K + C)
-    if (IsPCRel) {
-      Ctx.reportError(
-          Fixup.getLoc(),
-          "No relocation available to represent this relative expression");
-      return;
-    }
-
-    const auto &SymB = cast<MCSymbolELF>(RefB->getSymbol());
-
-    if (SymB.isUndefined()) {
-      Ctx.reportError(Fixup.getLoc(),
-                      Twine("symbol '") + SymB.getName() +
-                          "' can not be undefined in a subtraction expression");
-      return;
-    }
-
-    assert(!SymB.isAbsolute() && "Should have been folded");
-    const MCSection &SecB = SymB.getSection();
-    if (&SecB != &FixupSection) {
-      Ctx.reportError(Fixup.getLoc(),
-                      "Cannot represent a difference across sections");
-      return;
-    }
-
-    uint64_t SymBOffset = Layout.getSymbolOffset(SymB);
-    uint64_t K = SymBOffset - FixupOffset;
-    IsPCRel = true;
-    C -= K;
-  }
-
-  // We either rejected the fixup or folded B into C at this point.
-  const MCSymbolRefExpr *RefA = Target.getSymA();
-  const auto *SymA = RefA ? cast<MCSymbolELF>(&RefA->getSymbol()) : nullptr;
-
-  bool ViaWeakRef = false;
-  if (SymA && SymA->isVariable()) {
-    const MCExpr *Expr = SymA->getVariableValue();
-    if (const auto *Inner = dyn_cast<MCSymbolRefExpr>(Expr)) {
-      if (Inner->getKind() == MCSymbolRefExpr::VK_WEAKREF) {
-        SymA = cast<MCSymbolELF>(&Inner->getSymbol());
-        ViaWeakRef = true;
-      }
-    }
-  }
-
-  unsigned Type = TargetObjectWriter->getRelocType(Ctx, Target, Fixup, IsPCRel);
-  uint64_t OriginalC = C;
-  bool RelocateWithSymbol = shouldRelocateWithSymbol(Asm, RefA, SymA, C, Type);
-  if (!RelocateWithSymbol && SymA && !SymA->isUndefined())
-    C += Layout.getSymbolOffset(*SymA);
-
-  uint64_t Addend = 0;
-  if (hasRelocationAddend()) {
-    Addend = C;
-    C = 0;
-  }
-
-  FixedValue = C;
-
-  const MCSectionELF *SecA = (SymA && SymA->isInSection())
-                                 ? cast<MCSectionELF>(&SymA->getSection())
-                                 : nullptr;
-  if (!checkRelocation(Ctx, Fixup.getLoc(), &FixupSection, SecA))
-    return;
-
-  if (!RelocateWithSymbol) {
-    const auto *SectionSymbol =
-        SecA ? cast<MCSymbolELF>(SecA->getBeginSymbol()) : nullptr;
-    if (SectionSymbol)
-      SectionSymbol->setUsedInReloc();
-    ELFRelocationEntry Rec(FixupOffset, SectionSymbol, Type, Addend, SymA,
-                           OriginalC);
-    Relocations[&FixupSection].push_back(Rec);
-    return;
-  }
-
-  const auto *RenamedSymA = SymA;
-  if (SymA) {
-    if (const MCSymbolELF *R = Renames.lookup(SymA))
-      RenamedSymA = R;
-
-    if (ViaWeakRef)
-      RenamedSymA->setIsWeakrefUsedInReloc();
-    else
-      RenamedSymA->setUsedInReloc();
-  }
-  ELFRelocationEntry Rec(FixupOffset, RenamedSymA, Type, Addend, SymA,
-                         OriginalC);
-  Relocations[&FixupSection].push_back(Rec);
-}
-
-bool ELFObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(
-    const MCAssembler &Asm, const MCSymbol &SA, const MCFragment &FB,
-    bool InSet, bool IsPCRel) const {
-  const auto &SymA = cast<MCSymbolELF>(SA);
-  if (IsPCRel) {
-    assert(!InSet);
-    if (isWeak(SymA))
-      return false;
-  }
-  return MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(Asm, SymA, FB,
-                                                                InSet, IsPCRel);
-}
-
-std::unique_ptr<MCObjectWriter>
-llvm::createELFObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
-                            raw_pwrite_stream &OS, bool IsLittleEndian) {
-  return llvm::make_unique<ELFSingleObjectWriter>(std::move(MOTW), OS,
-                                                  IsLittleEndian);
-}
-
-std::unique_ptr<MCObjectWriter>
-llvm::createELFDwoObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
-                               raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS,
-                               bool IsLittleEndian) {
-  return llvm::make_unique<ELFDwoObjectWriter>(std::move(MOTW), OS, DwoOS,
-                                               IsLittleEndian);
-}