YQ Connector: support managed ClickHouse

Со стороны dqrun можно обратиться к инстансу коннектора, который работает на streaming стенде, и извлечь данные из облачного CH.

1 files changed, 1211 insertions, 0 deletions

diff --git a/contrib/libs/llvm14/include/llvm/Object/ELF.h b/contrib/libs/llvm14/include/llvm/Object/ELF.h
new file mode 100644
index 0000000000..4448e60be4
--- /dev/null
+++ b/contrib/libs/llvm14/include/llvm/Object/ELF.h
@@ -0,0 +1,1211 @@
+#pragma once
+
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
+//===- ELF.h - ELF object file implementation -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the ELFFile template class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_OBJECT_ELF_H
+#define LLVM_OBJECT_ELF_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/BinaryFormat/ELF.h"
+#include "llvm/Object/ELFTypes.h"
+#include "llvm/Object/Error.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <limits>
+#include <utility>
+
+namespace llvm {
+namespace object {
+
+struct VerdAux {
+  unsigned Offset;
+  std::string Name;
+};
+
+struct VerDef {
+  unsigned Offset;
+  unsigned Version;
+  unsigned Flags;
+  unsigned Ndx;
+  unsigned Cnt;
+  unsigned Hash;
+  std::string Name;
+  std::vector<VerdAux> AuxV;
+};
+
+struct VernAux {
+  unsigned Hash;
+  unsigned Flags;
+  unsigned Other;
+  unsigned Offset;
+  std::string Name;
+};
+
+struct VerNeed {
+  unsigned Version;
+  unsigned Cnt;
+  unsigned Offset;
+  std::string File;
+  std::vector<VernAux> AuxV;
+};
+
+struct VersionEntry {
+  std::string Name;
+  bool IsVerDef;
+};
+
+StringRef getELFRelocationTypeName(uint32_t Machine, uint32_t Type);
+uint32_t getELFRelativeRelocationType(uint32_t Machine);
+StringRef getELFSectionTypeName(uint32_t Machine, uint32_t Type);
+
+// Subclasses of ELFFile may need this for template instantiation
+inline std::pair<unsigned char, unsigned char>
+getElfArchType(StringRef Object) {
+  if (Object.size() < ELF::EI_NIDENT)
+    return std::make_pair((uint8_t)ELF::ELFCLASSNONE,
+                          (uint8_t)ELF::ELFDATANONE);
+  return std::make_pair((uint8_t)Object[ELF::EI_CLASS],
+                        (uint8_t)Object[ELF::EI_DATA]);
+}
+
+enum PPCInstrMasks : uint64_t {
+  PADDI_R12_NO_DISP = 0x0610000039800000,
+  ADDIS_R12_TO_R2_NO_DISP = 0x3D820000,
+  ADDI_R12_TO_R2_NO_DISP = 0x39820000,
+  ADDI_R12_TO_R12_NO_DISP = 0x398C0000,
+  PLD_R12_NO_DISP = 0x04100000E5800000,
+  MTCTR_R12 = 0x7D8903A6,
+  BCTR = 0x4E800420,
+};
+
+template <class ELFT> class ELFFile;
+
+template <class T> struct DataRegion {
+  // This constructor is used when we know the start and the size of a data
+  // region. We assume that Arr does not go past the end of the file.
+  DataRegion(ArrayRef<T> Arr) : First(Arr.data()), Size(Arr.size()) {}
+
+  // Sometimes we only know the start of a data region. We still don't want to
+  // read past the end of the file, so we provide the end of a buffer.
+  DataRegion(const T *Data, const uint8_t *BufferEnd)
+      : First(Data), BufEnd(BufferEnd) {}
+
+  Expected<T> operator[](uint64_t N) {
+    assert(Size || BufEnd);
+    if (Size) {
+      if (N >= *Size)
+        return createError(
+            "the index is greater than or equal to the number of entries (" +
+            Twine(*Size) + ")");
+    } else {
+      const uint8_t *EntryStart = (const uint8_t *)First + N * sizeof(T);
+      if (EntryStart + sizeof(T) > BufEnd)
+        return createError("can't read past the end of the file");
+    }
+    return *(First + N);
+  }
+
+  const T *First;
+  Optional<uint64_t> Size = None;
+  const uint8_t *BufEnd = nullptr;
+};
+
+template <class ELFT>
+std::string getSecIndexForError(const ELFFile<ELFT> &Obj,
+                                const typename ELFT::Shdr &Sec) {
+  auto TableOrErr = Obj.sections();
+  if (TableOrErr)
+    return "[index " + std::to_string(&Sec - &TableOrErr->front()) + "]";
+  // To make this helper be more convenient for error reporting purposes we
+  // drop the error. But really it should never be triggered. Before this point,
+  // our code should have called 'sections()' and reported a proper error on
+  // failure.
+  llvm::consumeError(TableOrErr.takeError());
+  return "[unknown index]";
+}
+
+template <class ELFT>
+static std::string describe(const ELFFile<ELFT> &Obj,
+                            const typename ELFT::Shdr &Sec) {
+  unsigned SecNdx = &Sec - &cantFail(Obj.sections()).front();
+  return (object::getELFSectionTypeName(Obj.getHeader().e_machine,
+                                        Sec.sh_type) +
+          " section with index " + Twine(SecNdx))
+      .str();
+}
+
+template <class ELFT>
+std::string getPhdrIndexForError(const ELFFile<ELFT> &Obj,
+                                 const typename ELFT::Phdr &Phdr) {
+  auto Headers = Obj.program_headers();
+  if (Headers)
+    return ("[index " + Twine(&Phdr - &Headers->front()) + "]").str();
+  // See comment in the getSecIndexForError() above.
+  llvm::consumeError(Headers.takeError());
+  return "[unknown index]";
+}
+
+static inline Error defaultWarningHandler(const Twine &Msg) {
+  return createError(Msg);
+}
+
+template <class ELFT>
+class ELFFile {
+public:
+  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
+
+  // This is a callback that can be passed to a number of functions.
+  // It can be used to ignore non-critical errors (warnings), which is
+  // useful for dumpers, like llvm-readobj.
+  // It accepts a warning message string and returns a success
+  // when the warning should be ignored or an error otherwise.
+  using WarningHandler = llvm::function_ref<Error(const Twine &Msg)>;
+
+  const uint8_t *base() const { return Buf.bytes_begin(); }
+  const uint8_t *end() const { return base() + getBufSize(); }
+
+  size_t getBufSize() const { return Buf.size(); }
+
+private:
+  StringRef Buf;
+
+  ELFFile(StringRef Object);
+
+public:
+  const Elf_Ehdr &getHeader() const {
+    return *reinterpret_cast<const Elf_Ehdr *>(base());
+  }
+
+  template <typename T>
+  Expected<const T *> getEntry(uint32_t Section, uint32_t Entry) const;
+  template <typename T>
+  Expected<const T *> getEntry(const Elf_Shdr &Section, uint32_t Entry) const;
+
+  Expected<std::vector<VerDef>>
+  getVersionDefinitions(const Elf_Shdr &Sec) const;
+  Expected<std::vector<VerNeed>> getVersionDependencies(
+      const Elf_Shdr &Sec,
+      WarningHandler WarnHandler = &defaultWarningHandler) const;
+  Expected<StringRef>
+  getSymbolVersionByIndex(uint32_t SymbolVersionIndex, bool &IsDefault,
+                          SmallVector<Optional<VersionEntry>, 0> &VersionMap,
+                          Optional<bool> IsSymHidden) const;
+
+  Expected<StringRef>
+  getStringTable(const Elf_Shdr &Section,
+                 WarningHandler WarnHandler = &defaultWarningHandler) const;
+  Expected<StringRef> getStringTableForSymtab(const Elf_Shdr &Section) const;
+  Expected<StringRef> getStringTableForSymtab(const Elf_Shdr &Section,
+                                              Elf_Shdr_Range Sections) const;
+  Expected<StringRef> getLinkAsStrtab(const typename ELFT::Shdr &Sec) const;
+
+  Expected<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section) const;
+  Expected<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section,
+                                             Elf_Shdr_Range Sections) const;
+
+  Expected<uint64_t> getDynSymtabSize() const;
+
+  StringRef getRelocationTypeName(uint32_t Type) const;
+  void getRelocationTypeName(uint32_t Type,
+                             SmallVectorImpl<char> &Result) const;
+  uint32_t getRelativeRelocationType() const;
+
+  std::string getDynamicTagAsString(unsigned Arch, uint64_t Type) const;
+  std::string getDynamicTagAsString(uint64_t Type) const;
+
+  /// Get the symbol for a given relocation.
+  Expected<const Elf_Sym *> getRelocationSymbol(const Elf_Rel &Rel,
+                                                const Elf_Shdr *SymTab) const;
+
+  Expected<SmallVector<Optional<VersionEntry>, 0>>
+  loadVersionMap(const Elf_Shdr *VerNeedSec, const Elf_Shdr *VerDefSec) const;
+
+  static Expected<ELFFile> create(StringRef Object);
+
+  bool isLE() const {
+    return getHeader().getDataEncoding() == ELF::ELFDATA2LSB;
+  }
+
+  bool isMipsELF64() const {
+    return getHeader().e_machine == ELF::EM_MIPS &&
+           getHeader().getFileClass() == ELF::ELFCLASS64;
+  }
+
+  bool isMips64EL() const { return isMipsELF64() && isLE(); }
+
+  Expected<Elf_Shdr_Range> sections() const;
+
+  Expected<Elf_Dyn_Range> dynamicEntries() const;
+
+  Expected<const uint8_t *>
+  toMappedAddr(uint64_t VAddr,
+               WarningHandler WarnHandler = &defaultWarningHandler) const;
+
+  Expected<Elf_Sym_Range> symbols(const Elf_Shdr *Sec) const {
+    if (!Sec)
+      return makeArrayRef<Elf_Sym>(nullptr, nullptr);
+    return getSectionContentsAsArray<Elf_Sym>(*Sec);
+  }
+
+  Expected<Elf_Rela_Range> relas(const Elf_Shdr &Sec) const {
+    return getSectionContentsAsArray<Elf_Rela>(Sec);
+  }
+
+  Expected<Elf_Rel_Range> rels(const Elf_Shdr &Sec) const {
+    return getSectionContentsAsArray<Elf_Rel>(Sec);
+  }
+
+  Expected<Elf_Relr_Range> relrs(const Elf_Shdr &Sec) const {
+    return getSectionContentsAsArray<Elf_Relr>(Sec);
+  }
+
+  std::vector<Elf_Rel> decode_relrs(Elf_Relr_Range relrs) const;
+
+  Expected<std::vector<Elf_Rela>> android_relas(const Elf_Shdr &Sec) const;
+
+  /// Iterate over program header table.
+  Expected<Elf_Phdr_Range> program_headers() const {
+    if (getHeader().e_phnum && getHeader().e_phentsize != sizeof(Elf_Phdr))
+      return createError("invalid e_phentsize: " +
+                         Twine(getHeader().e_phentsize));
+
+    uint64_t HeadersSize =
+        (uint64_t)getHeader().e_phnum * getHeader().e_phentsize;
+    uint64_t PhOff = getHeader().e_phoff;
+    if (PhOff + HeadersSize < PhOff || PhOff + HeadersSize > getBufSize())
+      return createError("program headers are longer than binary of size " +
+                         Twine(getBufSize()) + ": e_phoff = 0x" +
+                         Twine::utohexstr(getHeader().e_phoff) +
+                         ", e_phnum = " + Twine(getHeader().e_phnum) +
+                         ", e_phentsize = " + Twine(getHeader().e_phentsize));
+
+    auto *Begin = reinterpret_cast<const Elf_Phdr *>(base() + PhOff);
+    return makeArrayRef(Begin, Begin + getHeader().e_phnum);
+  }
+
+  /// Get an iterator over notes in a program header.
+  ///
+  /// The program header must be of type \c PT_NOTE.
+  ///
+  /// \param Phdr the program header to iterate over.
+  /// \param Err [out] an error to support fallible iteration, which should
+  ///  be checked after iteration ends.
+  Elf_Note_Iterator notes_begin(const Elf_Phdr &Phdr, Error &Err) const {
+    assert(Phdr.p_type == ELF::PT_NOTE && "Phdr is not of type PT_NOTE");
+    ErrorAsOutParameter ErrAsOutParam(&Err);
+    if (Phdr.p_offset + Phdr.p_filesz > getBufSize()) {
+      Err =
+          createError("invalid offset (0x" + Twine::utohexstr(Phdr.p_offset) +
+                      ") or size (0x" + Twine::utohexstr(Phdr.p_filesz) + ")");
+      return Elf_Note_Iterator(Err);
+    }
+    return Elf_Note_Iterator(base() + Phdr.p_offset, Phdr.p_filesz, Err);
+  }
+
+  /// Get an iterator over notes in a section.
+  ///
+  /// The section must be of type \c SHT_NOTE.
+  ///
+  /// \param Shdr the section to iterate over.
+  /// \param Err [out] an error to support fallible iteration, which should
+  ///  be checked after iteration ends.
+  Elf_Note_Iterator notes_begin(const Elf_Shdr &Shdr, Error &Err) const {
+    assert(Shdr.sh_type == ELF::SHT_NOTE && "Shdr is not of type SHT_NOTE");
+    ErrorAsOutParameter ErrAsOutParam(&Err);
+    if (Shdr.sh_offset + Shdr.sh_size > getBufSize()) {
+      Err =
+          createError("invalid offset (0x" + Twine::utohexstr(Shdr.sh_offset) +
+                      ") or size (0x" + Twine::utohexstr(Shdr.sh_size) + ")");
+      return Elf_Note_Iterator(Err);
+    }
+    return Elf_Note_Iterator(base() + Shdr.sh_offset, Shdr.sh_size, Err);
+  }
+
+  /// Get the end iterator for notes.
+  Elf_Note_Iterator notes_end() const {
+    return Elf_Note_Iterator();
+  }
+
+  /// Get an iterator range over notes of a program header.
+  ///
+  /// The program header must be of type \c PT_NOTE.
+  ///
+  /// \param Phdr the program header to iterate over.
+  /// \param Err [out] an error to support fallible iteration, which should
+  ///  be checked after iteration ends.
+  iterator_range<Elf_Note_Iterator> notes(const Elf_Phdr &Phdr,
+                                          Error &Err) const {
+    return make_range(notes_begin(Phdr, Err), notes_end());
+  }
+
+  /// Get an iterator range over notes of a section.
+  ///
+  /// The section must be of type \c SHT_NOTE.
+  ///
+  /// \param Shdr the section to iterate over.
+  /// \param Err [out] an error to support fallible iteration, which should
+  ///  be checked after iteration ends.
+  iterator_range<Elf_Note_Iterator> notes(const Elf_Shdr &Shdr,
+                                          Error &Err) const {
+    return make_range(notes_begin(Shdr, Err), notes_end());
+  }
+
+  Expected<StringRef> getSectionStringTable(
+      Elf_Shdr_Range Sections,
+      WarningHandler WarnHandler = &defaultWarningHandler) const;
+  Expected<uint32_t> getSectionIndex(const Elf_Sym &Sym, Elf_Sym_Range Syms,
+                                     DataRegion<Elf_Word> ShndxTable) const;
+  Expected<const Elf_Shdr *> getSection(const Elf_Sym &Sym,
+                                        const Elf_Shdr *SymTab,
+                                        DataRegion<Elf_Word> ShndxTable) const;
+  Expected<const Elf_Shdr *> getSection(const Elf_Sym &Sym,
+                                        Elf_Sym_Range Symtab,
+                                        DataRegion<Elf_Word> ShndxTable) const;
+  Expected<const Elf_Shdr *> getSection(uint32_t Index) const;
+
+  Expected<const Elf_Sym *> getSymbol(const Elf_Shdr *Sec,
+                                      uint32_t Index) const;
+
+  Expected<StringRef>
+  getSectionName(const Elf_Shdr &Section,
+                 WarningHandler WarnHandler = &defaultWarningHandler) const;
+  Expected<StringRef> getSectionName(const Elf_Shdr &Section,
+                                     StringRef DotShstrtab) const;
+  template <typename T>
+  Expected<ArrayRef<T>> getSectionContentsAsArray(const Elf_Shdr &Sec) const;
+  Expected<ArrayRef<uint8_t>> getSectionContents(const Elf_Shdr &Sec) const;
+  Expected<ArrayRef<uint8_t>> getSegmentContents(const Elf_Phdr &Phdr) const;
+  Expected<std::vector<BBAddrMap>> decodeBBAddrMap(const Elf_Shdr &Sec) const;
+};
+
+using ELF32LEFile = ELFFile<ELF32LE>;
+using ELF64LEFile = ELFFile<ELF64LE>;
+using ELF32BEFile = ELFFile<ELF32BE>;
+using ELF64BEFile = ELFFile<ELF64BE>;
+
+template <class ELFT>
+inline Expected<const typename ELFT::Shdr *>
+getSection(typename ELFT::ShdrRange Sections, uint32_t Index) {
+  if (Index >= Sections.size())
+    return createError("invalid section index: " + Twine(Index));
+  return &Sections[Index];
+}
+
+template <class ELFT>
+inline Expected<uint32_t>
+getExtendedSymbolTableIndex(const typename ELFT::Sym &Sym, unsigned SymIndex,
+                            DataRegion<typename ELFT::Word> ShndxTable) {
+  assert(Sym.st_shndx == ELF::SHN_XINDEX);
+  if (!ShndxTable.First)
+    return createError(
+        "found an extended symbol index (" + Twine(SymIndex) +
+        "), but unable to locate the extended symbol index table");
+
+  Expected<typename ELFT::Word> TableOrErr = ShndxTable[SymIndex];
+  if (!TableOrErr)
+    return createError("unable to read an extended symbol table at index " +
+                       Twine(SymIndex) + ": " +
+                       toString(TableOrErr.takeError()));
+  return *TableOrErr;
+}
+
+template <class ELFT>
+Expected<uint32_t>
+ELFFile<ELFT>::getSectionIndex(const Elf_Sym &Sym, Elf_Sym_Range Syms,
+                               DataRegion<Elf_Word> ShndxTable) const {
+  uint32_t Index = Sym.st_shndx;
+  if (Index == ELF::SHN_XINDEX) {
+    Expected<uint32_t> ErrorOrIndex =
+        getExtendedSymbolTableIndex<ELFT>(Sym, &Sym - Syms.begin(), ShndxTable);
+    if (!ErrorOrIndex)
+      return ErrorOrIndex.takeError();
+    return *ErrorOrIndex;
+  }
+  if (Index == ELF::SHN_UNDEF || Index >= ELF::SHN_LORESERVE)
+    return 0;
+  return Index;
+}
+
+template <class ELFT>
+Expected<const typename ELFT::Shdr *>
+ELFFile<ELFT>::getSection(const Elf_Sym &Sym, const Elf_Shdr *SymTab,
+                          DataRegion<Elf_Word> ShndxTable) const {
+  auto SymsOrErr = symbols(SymTab);
+  if (!SymsOrErr)
+    return SymsOrErr.takeError();
+  return getSection(Sym, *SymsOrErr, ShndxTable);
+}
+
+template <class ELFT>
+Expected<const typename ELFT::Shdr *>
+ELFFile<ELFT>::getSection(const Elf_Sym &Sym, Elf_Sym_Range Symbols,
+                          DataRegion<Elf_Word> ShndxTable) const {
+  auto IndexOrErr = getSectionIndex(Sym, Symbols, ShndxTable);
+  if (!IndexOrErr)
+    return IndexOrErr.takeError();
+  uint32_t Index = *IndexOrErr;
+  if (Index == 0)
+    return nullptr;
+  return getSection(Index);
+}
+
+template <class ELFT>
+Expected<const typename ELFT::Sym *>
+ELFFile<ELFT>::getSymbol(const Elf_Shdr *Sec, uint32_t Index) const {
+  auto SymsOrErr = symbols(Sec);
+  if (!SymsOrErr)
+    return SymsOrErr.takeError();
+
+  Elf_Sym_Range Symbols = *SymsOrErr;
+  if (Index >= Symbols.size())
+    return createError("unable to get symbol from section " +
+                       getSecIndexForError(*this, *Sec) +
+                       ": invalid symbol index (" + Twine(Index) + ")");
+  return &Symbols[Index];
+}
+
+template <class ELFT>
+template <typename T>
+Expected<ArrayRef<T>>
+ELFFile<ELFT>::getSectionContentsAsArray(const Elf_Shdr &Sec) const {
+  if (Sec.sh_entsize != sizeof(T) && sizeof(T) != 1)
+    return createError("section " + getSecIndexForError(*this, Sec) +
+                       " has invalid sh_entsize: expected " + Twine(sizeof(T)) +
+                       ", but got " + Twine(Sec.sh_entsize));
+
+  uintX_t Offset = Sec.sh_offset;
+  uintX_t Size = Sec.sh_size;
+
+  if (Size % sizeof(T))
+    return createError("section " + getSecIndexForError(*this, Sec) +
+                       " has an invalid sh_size (" + Twine(Size) +
+                       ") which is not a multiple of its sh_entsize (" +
+                       Twine(Sec.sh_entsize) + ")");
+  if (std::numeric_limits<uintX_t>::max() - Offset < Size)
+    return createError("section " + getSecIndexForError(*this, Sec) +
+                       " has a sh_offset (0x" + Twine::utohexstr(Offset) +
+                       ") + sh_size (0x" + Twine::utohexstr(Size) +
+                       ") that cannot be represented");
+  if (Offset + Size > Buf.size())
+    return createError("section " + getSecIndexForError(*this, Sec) +
+                       " has a sh_offset (0x" + Twine::utohexstr(Offset) +
+                       ") + sh_size (0x" + Twine::utohexstr(Size) +
+                       ") that is greater than the file size (0x" +
+                       Twine::utohexstr(Buf.size()) + ")");
+
+  if (Offset % alignof(T))
+    // TODO: this error is untested.
+    return createError("unaligned data");
+
+  const T *Start = reinterpret_cast<const T *>(base() + Offset);
+  return makeArrayRef(Start, Size / sizeof(T));
+}
+
+template <class ELFT>
+Expected<ArrayRef<uint8_t>>
+ELFFile<ELFT>::getSegmentContents(const Elf_Phdr &Phdr) const {
+  uintX_t Offset = Phdr.p_offset;
+  uintX_t Size = Phdr.p_filesz;
+
+  if (std::numeric_limits<uintX_t>::max() - Offset < Size)
+    return createError("program header " + getPhdrIndexForError(*this, Phdr) +
+                       " has a p_offset (0x" + Twine::utohexstr(Offset) +
+                       ") + p_filesz (0x" + Twine::utohexstr(Size) +
+                       ") that cannot be represented");
+  if (Offset + Size > Buf.size())
+    return createError("program header  " + getPhdrIndexForError(*this, Phdr) +
+                       " has a p_offset (0x" + Twine::utohexstr(Offset) +
+                       ") + p_filesz (0x" + Twine::utohexstr(Size) +
+                       ") that is greater than the file size (0x" +
+                       Twine::utohexstr(Buf.size()) + ")");
+  return makeArrayRef(base() + Offset, Size);
+}
+
+template <class ELFT>
+Expected<ArrayRef<uint8_t>>
+ELFFile<ELFT>::getSectionContents(const Elf_Shdr &Sec) const {
+  return getSectionContentsAsArray<uint8_t>(Sec);
+}
+
+template <class ELFT>
+StringRef ELFFile<ELFT>::getRelocationTypeName(uint32_t Type) const {
+  return getELFRelocationTypeName(getHeader().e_machine, Type);
+}
+
+template <class ELFT>
+void ELFFile<ELFT>::getRelocationTypeName(uint32_t Type,
+                                          SmallVectorImpl<char> &Result) const {
+  if (!isMipsELF64()) {
+    StringRef Name = getRelocationTypeName(Type);
+    Result.append(Name.begin(), Name.end());
+  } else {
+    // The Mips N64 ABI allows up to three operations to be specified per
+    // relocation record. Unfortunately there's no easy way to test for the
+    // presence of N64 ELFs as they have no special flag that identifies them
+    // as being N64. We can safely assume at the moment that all Mips
+    // ELFCLASS64 ELFs are N64. New Mips64 ABIs should provide enough
+    // information to disambiguate between old vs new ABIs.
+    uint8_t Type1 = (Type >> 0) & 0xFF;
+    uint8_t Type2 = (Type >> 8) & 0xFF;
+    uint8_t Type3 = (Type >> 16) & 0xFF;
+
+    // Concat all three relocation type names.
+    StringRef Name = getRelocationTypeName(Type1);
+    Result.append(Name.begin(), Name.end());
+
+    Name = getRelocationTypeName(Type2);
+    Result.append(1, '/');
+    Result.append(Name.begin(), Name.end());
+
+    Name = getRelocationTypeName(Type3);
+    Result.append(1, '/');
+    Result.append(Name.begin(), Name.end());
+  }
+}
+
+template <class ELFT>
+uint32_t ELFFile<ELFT>::getRelativeRelocationType() const {
+  return getELFRelativeRelocationType(getHeader().e_machine);
+}
+
+template <class ELFT>
+Expected<SmallVector<Optional<VersionEntry>, 0>>
+ELFFile<ELFT>::loadVersionMap(const Elf_Shdr *VerNeedSec,
+                              const Elf_Shdr *VerDefSec) const {
+  SmallVector<Optional<VersionEntry>, 0> VersionMap;
+
+  // The first two version indexes are reserved.
+  // Index 0 is VER_NDX_LOCAL, index 1 is VER_NDX_GLOBAL.
+  VersionMap.push_back(VersionEntry());
+  VersionMap.push_back(VersionEntry());
+
+  auto InsertEntry = [&](unsigned N, StringRef Version, bool IsVerdef) {
+    if (N >= VersionMap.size())
+      VersionMap.resize(N + 1);
+    VersionMap[N] = {std::string(Version), IsVerdef};
+  };
+
+  if (VerDefSec) {
+    Expected<std::vector<VerDef>> Defs = getVersionDefinitions(*VerDefSec);
+    if (!Defs)
+      return Defs.takeError();
+    for (const VerDef &Def : *Defs)
+      InsertEntry(Def.Ndx & ELF::VERSYM_VERSION, Def.Name, true);
+  }
+
+  if (VerNeedSec) {
+    Expected<std::vector<VerNeed>> Deps = getVersionDependencies(*VerNeedSec);
+    if (!Deps)
+      return Deps.takeError();
+    for (const VerNeed &Dep : *Deps)
+      for (const VernAux &Aux : Dep.AuxV)
+        InsertEntry(Aux.Other & ELF::VERSYM_VERSION, Aux.Name, false);
+  }
+
+  return VersionMap;
+}
+
+template <class ELFT>
+Expected<const typename ELFT::Sym *>
+ELFFile<ELFT>::getRelocationSymbol(const Elf_Rel &Rel,
+                                   const Elf_Shdr *SymTab) const {
+  uint32_t Index = Rel.getSymbol(isMips64EL());
+  if (Index == 0)
+    return nullptr;
+  return getEntry<Elf_Sym>(*SymTab, Index);
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getSectionStringTable(Elf_Shdr_Range Sections,
+                                     WarningHandler WarnHandler) const {
+  uint32_t Index = getHeader().e_shstrndx;
+  if (Index == ELF::SHN_XINDEX) {
+    // If the section name string table section index is greater than
+    // or equal to SHN_LORESERVE, then the actual index of the section name
+    // string table section is contained in the sh_link field of the section
+    // header at index 0.
+    if (Sections.empty())
+      return createError(
+          "e_shstrndx == SHN_XINDEX, but the section header table is empty");
+
+    Index = Sections[0].sh_link;
+  }
+
+  if (!Index) // no section string table.
+    return "";
+  if (Index >= Sections.size())
+    return createError("section header string table index " + Twine(Index) +
+                       " does not exist");
+  return getStringTable(Sections[Index], WarnHandler);
+}
+
+/// This function finds the number of dynamic symbols using a GNU hash table.
+///
+/// @param Table The GNU hash table for .dynsym.
+template <class ELFT>
+static Expected<uint64_t>
+getDynSymtabSizeFromGnuHash(const typename ELFT::GnuHash &Table,
+                            const void *BufEnd) {
+  using Elf_Word = typename ELFT::Word;
+  if (Table.nbuckets == 0)
+    return Table.symndx + 1;
+  uint64_t LastSymIdx = 0;
+  // Find the index of the first symbol in the last chain.
+  for (Elf_Word Val : Table.buckets())
+    LastSymIdx = std::max(LastSymIdx, (uint64_t)Val);
+  const Elf_Word *It =
+      reinterpret_cast<const Elf_Word *>(Table.values(LastSymIdx).end());
+  // Locate the end of the chain to find the last symbol index.
+  while (It < BufEnd && (*It & 1) == 0) {
+    ++LastSymIdx;
+    ++It;
+  }
+  if (It >= BufEnd) {
+    return createStringError(
+        object_error::parse_failed,
+        "no terminator found for GNU hash section before buffer end");
+  }
+  return LastSymIdx + 1;
+}
+
+/// This function determines the number of dynamic symbols. It reads section
+/// headers first. If section headers are not available, the number of
+/// symbols will be inferred by parsing dynamic hash tables.
+template <class ELFT>
+Expected<uint64_t> ELFFile<ELFT>::getDynSymtabSize() const {
+  // Read .dynsym section header first if available.
+  Expected<Elf_Shdr_Range> SectionsOrError = sections();
+  if (!SectionsOrError)
+    return SectionsOrError.takeError();
+  for (const Elf_Shdr &Sec : *SectionsOrError) {
+    if (Sec.sh_type == ELF::SHT_DYNSYM) {
+      if (Sec.sh_size % Sec.sh_entsize != 0) {
+        return createStringError(object_error::parse_failed,
+                                 "SHT_DYNSYM section has sh_size (" +
+                                     Twine(Sec.sh_size) + ") % sh_entsize (" +
+                                     Twine(Sec.sh_entsize) + ") that is not 0");
+      }
+      return Sec.sh_size / Sec.sh_entsize;
+    }
+  }
+
+  if (!SectionsOrError->empty()) {
+    // Section headers are available but .dynsym header is not found.
+    // Return 0 as .dynsym does not exist.
+    return 0;
+  }
+
+  // Section headers do not exist. Falling back to infer
+  // upper bound of .dynsym from .gnu.hash and .hash.
+  Expected<Elf_Dyn_Range> DynTable = dynamicEntries();
+  if (!DynTable)
+    return DynTable.takeError();
+  llvm::Optional<uint64_t> ElfHash;
+  llvm::Optional<uint64_t> ElfGnuHash;
+  for (const Elf_Dyn &Entry : *DynTable) {
+    switch (Entry.d_tag) {
+    case ELF::DT_HASH:
+      ElfHash = Entry.d_un.d_ptr;
+      break;
+    case ELF::DT_GNU_HASH:
+      ElfGnuHash = Entry.d_un.d_ptr;
+      break;
+    }
+  }
+  if (ElfGnuHash) {
+    Expected<const uint8_t *> TablePtr = toMappedAddr(*ElfGnuHash);
+    if (!TablePtr)
+      return TablePtr.takeError();
+    const Elf_GnuHash *Table =
+        reinterpret_cast<const Elf_GnuHash *>(TablePtr.get());
+    return getDynSymtabSizeFromGnuHash<ELFT>(*Table, this->Buf.bytes_end());
+  }
+
+  // Search SYSV hash table to try to find the upper bound of dynsym.
+  if (ElfHash) {
+    Expected<const uint8_t *> TablePtr = toMappedAddr(*ElfHash);
+    if (!TablePtr)
+      return TablePtr.takeError();
+    const Elf_Hash *Table = reinterpret_cast<const Elf_Hash *>(TablePtr.get());
+    return Table->nchain;
+  }
+  return 0;
+}
+
+template <class ELFT> ELFFile<ELFT>::ELFFile(StringRef Object) : Buf(Object) {}
+
+template <class ELFT>
+Expected<ELFFile<ELFT>> ELFFile<ELFT>::create(StringRef Object) {
+  if (sizeof(Elf_Ehdr) > Object.size())
+    return createError("invalid buffer: the size (" + Twine(Object.size()) +
+                       ") is smaller than an ELF header (" +
+                       Twine(sizeof(Elf_Ehdr)) + ")");
+  return ELFFile(Object);
+}
+
+template <class ELFT>
+Expected<typename ELFT::ShdrRange> ELFFile<ELFT>::sections() const {
+  const uintX_t SectionTableOffset = getHeader().e_shoff;
+  if (SectionTableOffset == 0)
+    return ArrayRef<Elf_Shdr>();
+
+  if (getHeader().e_shentsize != sizeof(Elf_Shdr))
+    return createError("invalid e_shentsize in ELF header: " +
+                       Twine(getHeader().e_shentsize));
+
+  const uint64_t FileSize = Buf.size();
+  if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize ||
+      SectionTableOffset + (uintX_t)sizeof(Elf_Shdr) < SectionTableOffset)
+    return createError(
+        "section header table goes past the end of the file: e_shoff = 0x" +
+        Twine::utohexstr(SectionTableOffset));
+
+  // Invalid address alignment of section headers
+  if (SectionTableOffset & (alignof(Elf_Shdr) - 1))
+    // TODO: this error is untested.
+    return createError("invalid alignment of section headers");
+
+  const Elf_Shdr *First =
+      reinterpret_cast<const Elf_Shdr *>(base() + SectionTableOffset);
+
+  uintX_t NumSections = getHeader().e_shnum;
+  if (NumSections == 0)
+    NumSections = First->sh_size;
+
+  if (NumSections > UINT64_MAX / sizeof(Elf_Shdr))
+    return createError("invalid number of sections specified in the NULL "
+                       "section's sh_size field (" +
+                       Twine(NumSections) + ")");
+
+  const uint64_t SectionTableSize = NumSections * sizeof(Elf_Shdr);
+  if (SectionTableOffset + SectionTableSize < SectionTableOffset)
+    return createError(
+        "invalid section header table offset (e_shoff = 0x" +
+        Twine::utohexstr(SectionTableOffset) +
+        ") or invalid number of sections specified in the first section "
+        "header's sh_size field (0x" +
+        Twine::utohexstr(NumSections) + ")");
+
+  // Section table goes past end of file!
+  if (SectionTableOffset + SectionTableSize > FileSize)
+    return createError("section table goes past the end of file");
+  return makeArrayRef(First, NumSections);
+}
+
+template <class ELFT>
+template <typename T>
+Expected<const T *> ELFFile<ELFT>::getEntry(uint32_t Section,
+                                            uint32_t Entry) const {
+  auto SecOrErr = getSection(Section);
+  if (!SecOrErr)
+    return SecOrErr.takeError();
+  return getEntry<T>(**SecOrErr, Entry);
+}
+
+template <class ELFT>
+template <typename T>
+Expected<const T *> ELFFile<ELFT>::getEntry(const Elf_Shdr &Section,
+                                            uint32_t Entry) const {
+  Expected<ArrayRef<T>> EntriesOrErr = getSectionContentsAsArray<T>(Section);
+  if (!EntriesOrErr)
+    return EntriesOrErr.takeError();
+
+  ArrayRef<T> Arr = *EntriesOrErr;
+  if (Entry >= Arr.size())
+    return createError(
+        "can't read an entry at 0x" +
+        Twine::utohexstr(Entry * static_cast<uint64_t>(sizeof(T))) +
+        ": it goes past the end of the section (0x" +
+        Twine::utohexstr(Section.sh_size) + ")");
+  return &Arr[Entry];
+}
+
+template <typename ELFT>
+Expected<StringRef> ELFFile<ELFT>::getSymbolVersionByIndex(
+    uint32_t SymbolVersionIndex, bool &IsDefault,
+    SmallVector<Optional<VersionEntry>, 0> &VersionMap,
+    Optional<bool> IsSymHidden) const {
+  size_t VersionIndex = SymbolVersionIndex & llvm::ELF::VERSYM_VERSION;
+
+  // Special markers for unversioned symbols.
+  if (VersionIndex == llvm::ELF::VER_NDX_LOCAL ||
+      VersionIndex == llvm::ELF::VER_NDX_GLOBAL) {
+    IsDefault = false;
+    return "";
+  }
+
+  // Lookup this symbol in the version table.
+  if (VersionIndex >= VersionMap.size() || !VersionMap[VersionIndex])
+    return createError("SHT_GNU_versym section refers to a version index " +
+                       Twine(VersionIndex) + " which is missing");
+
+  const VersionEntry &Entry = *VersionMap[VersionIndex];
+  // A default version (@@) is only available for defined symbols.
+  if (!Entry.IsVerDef || IsSymHidden.getValueOr(false))
+    IsDefault = false;
+  else
+    IsDefault = !(SymbolVersionIndex & llvm::ELF::VERSYM_HIDDEN);
+  return Entry.Name.c_str();
+}
+
+template <class ELFT>
+Expected<std::vector<VerDef>>
+ELFFile<ELFT>::getVersionDefinitions(const Elf_Shdr &Sec) const {
+  Expected<StringRef> StrTabOrErr = getLinkAsStrtab(Sec);
+  if (!StrTabOrErr)
+    return StrTabOrErr.takeError();
+
+  Expected<ArrayRef<uint8_t>> ContentsOrErr = getSectionContents(Sec);
+  if (!ContentsOrErr)
+    return createError("cannot read content of " + describe(*this, Sec) + ": " +
+                       toString(ContentsOrErr.takeError()));
+
+  const uint8_t *Start = ContentsOrErr->data();
+  const uint8_t *End = Start + ContentsOrErr->size();
+
+  auto ExtractNextAux = [&](const uint8_t *&VerdauxBuf,
+                            unsigned VerDefNdx) -> Expected<VerdAux> {
+    if (VerdauxBuf + sizeof(Elf_Verdaux) > End)
+      return createError("invalid " + describe(*this, Sec) +
+                         ": version definition " + Twine(VerDefNdx) +
+                         " refers to an auxiliary entry that goes past the end "
+                         "of the section");
+
+    auto *Verdaux = reinterpret_cast<const Elf_Verdaux *>(VerdauxBuf);
+    VerdauxBuf += Verdaux->vda_next;
+
+    VerdAux Aux;
+    Aux.Offset = VerdauxBuf - Start;
+    if (Verdaux->vda_name <= StrTabOrErr->size())
+      Aux.Name = std::string(StrTabOrErr->drop_front(Verdaux->vda_name));
+    else
+      Aux.Name = ("<invalid vda_name: " + Twine(Verdaux->vda_name) + ">").str();
+    return Aux;
+  };
+
+  std::vector<VerDef> Ret;
+  const uint8_t *VerdefBuf = Start;
+  for (unsigned I = 1; I <= /*VerDefsNum=*/Sec.sh_info; ++I) {
+    if (VerdefBuf + sizeof(Elf_Verdef) > End)
+      return createError("invalid " + describe(*this, Sec) +
+                         ": version definition " + Twine(I) +
+                         " goes past the end of the section");
+
+    if (reinterpret_cast<uintptr_t>(VerdefBuf) % sizeof(uint32_t) != 0)
+      return createError(
+          "invalid " + describe(*this, Sec) +
+          ": found a misaligned version definition entry at offset 0x" +
+          Twine::utohexstr(VerdefBuf - Start));
+
+    unsigned Version = *reinterpret_cast<const Elf_Half *>(VerdefBuf);
+    if (Version != 1)
+      return createError("unable to dump " + describe(*this, Sec) +
+                         ": version " + Twine(Version) +
+                         " is not yet supported");
+
+    const Elf_Verdef *D = reinterpret_cast<const Elf_Verdef *>(VerdefBuf);
+    VerDef &VD = *Ret.emplace(Ret.end());
+    VD.Offset = VerdefBuf - Start;
+    VD.Version = D->vd_version;
+    VD.Flags = D->vd_flags;
+    VD.Ndx = D->vd_ndx;
+    VD.Cnt = D->vd_cnt;
+    VD.Hash = D->vd_hash;
+
+    const uint8_t *VerdauxBuf = VerdefBuf + D->vd_aux;
+    for (unsigned J = 0; J < D->vd_cnt; ++J) {
+      if (reinterpret_cast<uintptr_t>(VerdauxBuf) % sizeof(uint32_t) != 0)
+        return createError("invalid " + describe(*this, Sec) +
+                           ": found a misaligned auxiliary entry at offset 0x" +
+                           Twine::utohexstr(VerdauxBuf - Start));
+
+      Expected<VerdAux> AuxOrErr = ExtractNextAux(VerdauxBuf, I);
+      if (!AuxOrErr)
+        return AuxOrErr.takeError();
+
+      if (J == 0)
+        VD.Name = AuxOrErr->Name;
+      else
+        VD.AuxV.push_back(*AuxOrErr);
+    }
+
+    VerdefBuf += D->vd_next;
+  }
+
+  return Ret;
+}
+
+template <class ELFT>
+Expected<std::vector<VerNeed>>
+ELFFile<ELFT>::getVersionDependencies(const Elf_Shdr &Sec,
+                                      WarningHandler WarnHandler) const {
+  StringRef StrTab;
+  Expected<StringRef> StrTabOrErr = getLinkAsStrtab(Sec);
+  if (!StrTabOrErr) {
+    if (Error E = WarnHandler(toString(StrTabOrErr.takeError())))
+      return std::move(E);
+  } else {
+    StrTab = *StrTabOrErr;
+  }
+
+  Expected<ArrayRef<uint8_t>> ContentsOrErr = getSectionContents(Sec);
+  if (!ContentsOrErr)
+    return createError("cannot read content of " + describe(*this, Sec) + ": " +
+                       toString(ContentsOrErr.takeError()));
+
+  const uint8_t *Start = ContentsOrErr->data();
+  const uint8_t *End = Start + ContentsOrErr->size();
+  const uint8_t *VerneedBuf = Start;
+
+  std::vector<VerNeed> Ret;
+  for (unsigned I = 1; I <= /*VerneedNum=*/Sec.sh_info; ++I) {
+    if (VerneedBuf + sizeof(Elf_Verdef) > End)
+      return createError("invalid " + describe(*this, Sec) +
+                         ": version dependency " + Twine(I) +
+                         " goes past the end of the section");
+
+    if (reinterpret_cast<uintptr_t>(VerneedBuf) % sizeof(uint32_t) != 0)
+      return createError(
+          "invalid " + describe(*this, Sec) +
+          ": found a misaligned version dependency entry at offset 0x" +
+          Twine::utohexstr(VerneedBuf - Start));
+
+    unsigned Version = *reinterpret_cast<const Elf_Half *>(VerneedBuf);
+    if (Version != 1)
+      return createError("unable to dump " + describe(*this, Sec) +
+                         ": version " + Twine(Version) +
+                         " is not yet supported");
+
+    const Elf_Verneed *Verneed =
+        reinterpret_cast<const Elf_Verneed *>(VerneedBuf);
+
+    VerNeed &VN = *Ret.emplace(Ret.end());
+    VN.Version = Verneed->vn_version;
+    VN.Cnt = Verneed->vn_cnt;
+    VN.Offset = VerneedBuf - Start;
+
+    if (Verneed->vn_file < StrTab.size())
+      VN.File = std::string(StrTab.drop_front(Verneed->vn_file));
+    else
+      VN.File = ("<corrupt vn_file: " + Twine(Verneed->vn_file) + ">").str();
+
+    const uint8_t *VernauxBuf = VerneedBuf + Verneed->vn_aux;
+    for (unsigned J = 0; J < Verneed->vn_cnt; ++J) {
+      if (reinterpret_cast<uintptr_t>(VernauxBuf) % sizeof(uint32_t) != 0)
+        return createError("invalid " + describe(*this, Sec) +
+                           ": found a misaligned auxiliary entry at offset 0x" +
+                           Twine::utohexstr(VernauxBuf - Start));
+
+      if (VernauxBuf + sizeof(Elf_Vernaux) > End)
+        return createError(
+            "invalid " + describe(*this, Sec) + ": version dependency " +
+            Twine(I) +
+            " refers to an auxiliary entry that goes past the end "
+            "of the section");
+
+      const Elf_Vernaux *Vernaux =
+          reinterpret_cast<const Elf_Vernaux *>(VernauxBuf);
+
+      VernAux &Aux = *VN.AuxV.emplace(VN.AuxV.end());
+      Aux.Hash = Vernaux->vna_hash;
+      Aux.Flags = Vernaux->vna_flags;
+      Aux.Other = Vernaux->vna_other;
+      Aux.Offset = VernauxBuf - Start;
+      if (StrTab.size() <= Vernaux->vna_name)
+        Aux.Name = "<corrupt>";
+      else
+        Aux.Name = std::string(StrTab.drop_front(Vernaux->vna_name));
+
+      VernauxBuf += Vernaux->vna_next;
+    }
+    VerneedBuf += Verneed->vn_next;
+  }
+  return Ret;
+}
+
+template <class ELFT>
+Expected<const typename ELFT::Shdr *>
+ELFFile<ELFT>::getSection(uint32_t Index) const {
+  auto TableOrErr = sections();
+  if (!TableOrErr)
+    return TableOrErr.takeError();
+  return object::getSection<ELFT>(*TableOrErr, Index);
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getStringTable(const Elf_Shdr &Section,
+                              WarningHandler WarnHandler) const {
+  if (Section.sh_type != ELF::SHT_STRTAB)
+    if (Error E = WarnHandler("invalid sh_type for string table section " +
+                              getSecIndexForError(*this, Section) +
+                              ": expected SHT_STRTAB, but got " +
+                              object::getELFSectionTypeName(
+                                  getHeader().e_machine, Section.sh_type)))
+      return std::move(E);
+
+  auto V = getSectionContentsAsArray<char>(Section);
+  if (!V)
+    return V.takeError();
+  ArrayRef<char> Data = *V;
+  if (Data.empty())
+    return createError("SHT_STRTAB string table section " +
+                       getSecIndexForError(*this, Section) + " is empty");
+  if (Data.back() != '\0')
+    return createError("SHT_STRTAB string table section " +
+                       getSecIndexForError(*this, Section) +
+                       " is non-null terminated");
+  return StringRef(Data.begin(), Data.size());
+}
+
+template <class ELFT>
+Expected<ArrayRef<typename ELFT::Word>>
+ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section) const {
+  auto SectionsOrErr = sections();
+  if (!SectionsOrErr)
+    return SectionsOrErr.takeError();
+  return getSHNDXTable(Section, *SectionsOrErr);
+}
+
+template <class ELFT>
+Expected<ArrayRef<typename ELFT::Word>>
+ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section,
+                             Elf_Shdr_Range Sections) const {
+  assert(Section.sh_type == ELF::SHT_SYMTAB_SHNDX);
+  auto VOrErr = getSectionContentsAsArray<Elf_Word>(Section);
+  if (!VOrErr)
+    return VOrErr.takeError();
+  ArrayRef<Elf_Word> V = *VOrErr;
+  auto SymTableOrErr = object::getSection<ELFT>(Sections, Section.sh_link);
+  if (!SymTableOrErr)
+    return SymTableOrErr.takeError();
+  const Elf_Shdr &SymTable = **SymTableOrErr;
+  if (SymTable.sh_type != ELF::SHT_SYMTAB &&
+      SymTable.sh_type != ELF::SHT_DYNSYM)
+    return createError(
+        "SHT_SYMTAB_SHNDX section is linked with " +
+        object::getELFSectionTypeName(getHeader().e_machine, SymTable.sh_type) +
+        " section (expected SHT_SYMTAB/SHT_DYNSYM)");
+
+  uint64_t Syms = SymTable.sh_size / sizeof(Elf_Sym);
+  if (V.size() != Syms)
+    return createError("SHT_SYMTAB_SHNDX has " + Twine(V.size()) +
+                       " entries, but the symbol table associated has " +
+                       Twine(Syms));
+
+  return V;
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec) const {
+  auto SectionsOrErr = sections();
+  if (!SectionsOrErr)
+    return SectionsOrErr.takeError();
+  return getStringTableForSymtab(Sec, *SectionsOrErr);
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec,
+                                       Elf_Shdr_Range Sections) const {
+
+  if (Sec.sh_type != ELF::SHT_SYMTAB && Sec.sh_type != ELF::SHT_DYNSYM)
+    return createError(
+        "invalid sh_type for symbol table, expected SHT_SYMTAB or SHT_DYNSYM");
+  Expected<const Elf_Shdr *> SectionOrErr =
+      object::getSection<ELFT>(Sections, Sec.sh_link);
+  if (!SectionOrErr)
+    return SectionOrErr.takeError();
+  return getStringTable(**SectionOrErr);
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getLinkAsStrtab(const typename ELFT::Shdr &Sec) const {
+  Expected<const typename ELFT::Shdr *> StrTabSecOrErr =
+      getSection(Sec.sh_link);
+  if (!StrTabSecOrErr)
+    return createError("invalid section linked to " + describe(*this, Sec) +
+                       ": " + toString(StrTabSecOrErr.takeError()));
+
+  Expected<StringRef> StrTabOrErr = getStringTable(**StrTabSecOrErr);
+  if (!StrTabOrErr)
+    return createError("invalid string table linked to " +
+                       describe(*this, Sec) + ": " +
+                       toString(StrTabOrErr.takeError()));
+  return *StrTabOrErr;
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getSectionName(const Elf_Shdr &Section,
+                              WarningHandler WarnHandler) const {
+  auto SectionsOrErr = sections();
+  if (!SectionsOrErr)
+    return SectionsOrErr.takeError();
+  auto Table = getSectionStringTable(*SectionsOrErr, WarnHandler);
+  if (!Table)
+    return Table.takeError();
+  return getSectionName(Section, *Table);
+}
+
+template <class ELFT>
+Expected<StringRef> ELFFile<ELFT>::getSectionName(const Elf_Shdr &Section,
+                                                  StringRef DotShstrtab) const {
+  uint32_t Offset = Section.sh_name;
+  if (Offset == 0)
+    return StringRef();
+  if (Offset >= DotShstrtab.size())
+    return createError("a section " + getSecIndexForError(*this, Section) +
+                       " has an invalid sh_name (0x" +
+                       Twine::utohexstr(Offset) +
+                       ") offset which goes past the end of the "
+                       "section name string table");
+  return StringRef(DotShstrtab.data() + Offset);
+}
+
+/// This function returns the hash value for a symbol in the .dynsym section
+/// Name of the API remains consistent as specified in the libelf
+/// REF : http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#hash
+inline unsigned hashSysV(StringRef SymbolName) {
+  unsigned h = 0, g;
+  for (char C : SymbolName) {
+    h = (h << 4) + C;
+    g = h & 0xf0000000L;
+    if (g != 0)
+      h ^= g >> 24;
+    h &= ~g;
+  }
+  return h;
+}
+
+} // end namespace object
+} // end namespace llvm
+
+#endif // LLVM_OBJECT_ELF_H
+
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif