Restoring authorship annotation for <orivej@yandex-team.ru>. Commit 1 of 2.

1 files changed, 989 insertions, 989 deletions

diff --git a/contrib/libs/llvm12/lib/Object/Archive.cpp b/contrib/libs/llvm12/lib/Object/Archive.cpp
index 11c9de4455..9023ac55ec 100644
--- a/contrib/libs/llvm12/lib/Object/Archive.cpp
+++ b/contrib/libs/llvm12/lib/Object/Archive.cpp
@@ -1,991 +1,991 @@
-//===- Archive.cpp - ar File Format implementation ------------------------===//
-//
-// 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 defines the ArchiveObjectFile class.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Object/Archive.h"
-#include "llvm/ADT/Optional.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/Twine.h"
-#include "llvm/Object/Binary.h"
-#include "llvm/Object/Error.h"
-#include "llvm/Support/Chrono.h"
-#include "llvm/Support/Endian.h"
-#include "llvm/Support/Error.h"
-#include "llvm/Support/ErrorOr.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Path.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-#include <cassert>
-#include <cstddef>
-#include <cstdint>
-#include <cstring>
-#include <memory>
-#include <string>
-#include <system_error>
-
-using namespace llvm;
-using namespace object;
-using namespace llvm::support::endian;
-
+//===- Archive.cpp - ar File Format implementation ------------------------===// 
+// 
+// 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 defines the ArchiveObjectFile class. 
+// 
+//===----------------------------------------------------------------------===// 
+ 
+#include "llvm/Object/Archive.h" 
+#include "llvm/ADT/Optional.h" 
+#include "llvm/ADT/SmallString.h" 
+#include "llvm/ADT/StringRef.h" 
+#include "llvm/ADT/Twine.h" 
+#include "llvm/Object/Binary.h" 
+#include "llvm/Object/Error.h" 
+#include "llvm/Support/Chrono.h" 
+#include "llvm/Support/Endian.h" 
+#include "llvm/Support/Error.h" 
+#include "llvm/Support/ErrorOr.h" 
+#include "llvm/Support/FileSystem.h" 
+#include "llvm/Support/MemoryBuffer.h" 
+#include "llvm/Support/Path.h" 
+#include "llvm/Support/raw_ostream.h" 
+#include <algorithm> 
+#include <cassert> 
+#include <cstddef> 
+#include <cstdint> 
+#include <cstring> 
+#include <memory> 
+#include <string> 
+#include <system_error> 
+ 
+using namespace llvm; 
+using namespace object; 
+using namespace llvm::support::endian; 
+ 
 const char Magic[] = "!<arch>\n";
 const char ThinMagic[] = "!<thin>\n";
-
-void Archive::anchor() {}
-
-static Error
-malformedError(Twine Msg) {
-  std::string StringMsg = "truncated or malformed archive (" + Msg.str() + ")";
-  return make_error<GenericBinaryError>(std::move(StringMsg),
-                                        object_error::parse_failed);
-}
-
-ArchiveMemberHeader::ArchiveMemberHeader(const Archive *Parent,
-                                         const char *RawHeaderPtr,
-                                         uint64_t Size, Error *Err)
-    : Parent(Parent),
-      ArMemHdr(reinterpret_cast<const ArMemHdrType *>(RawHeaderPtr)) {
-  if (RawHeaderPtr == nullptr)
-    return;
-  ErrorAsOutParameter ErrAsOutParam(Err);
-
-  if (Size < sizeof(ArMemHdrType)) {
-    if (Err) {
-      std::string Msg("remaining size of archive too small for next archive "
-                      "member header ");
-      Expected<StringRef> NameOrErr = getName(Size);
-      if (!NameOrErr) {
-        consumeError(NameOrErr.takeError());
-        uint64_t Offset = RawHeaderPtr - Parent->getData().data();
-        *Err = malformedError(Msg + "at offset " + Twine(Offset));
-      } else
-        *Err = malformedError(Msg + "for " + NameOrErr.get());
-    }
-    return;
-  }
-  if (ArMemHdr->Terminator[0] != '`' || ArMemHdr->Terminator[1] != '\n') {
-    if (Err) {
-      std::string Buf;
-      raw_string_ostream OS(Buf);
-      OS.write_escaped(StringRef(ArMemHdr->Terminator,
-                                 sizeof(ArMemHdr->Terminator)));
-      OS.flush();
-      std::string Msg("terminator characters in archive member \"" + Buf +
-                      "\" not the correct \"`\\n\" values for the archive "
-                      "member header ");
-      Expected<StringRef> NameOrErr = getName(Size);
-      if (!NameOrErr) {
-        consumeError(NameOrErr.takeError());
-        uint64_t Offset = RawHeaderPtr - Parent->getData().data();
-        *Err = malformedError(Msg + "at offset " + Twine(Offset));
-      } else
-        *Err = malformedError(Msg + "for " + NameOrErr.get());
-    }
-    return;
-  }
-}
-
-// This gets the raw name from the ArMemHdr->Name field and checks that it is
-// valid for the kind of archive.  If it is not valid it returns an Error.
-Expected<StringRef> ArchiveMemberHeader::getRawName() const {
-  char EndCond;
-  auto Kind = Parent->kind();
-  if (Kind == Archive::K_BSD || Kind == Archive::K_DARWIN64) {
-    if (ArMemHdr->Name[0] == ' ') {
-      uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
-                        Parent->getData().data();
-      return malformedError("name contains a leading space for archive member "
-                            "header at offset " + Twine(Offset));
-    }
-    EndCond = ' ';
-  }
-  else if (ArMemHdr->Name[0] == '/' || ArMemHdr->Name[0] == '#')
-    EndCond = ' ';
-  else
-    EndCond = '/';
-  StringRef::size_type end =
-      StringRef(ArMemHdr->Name, sizeof(ArMemHdr->Name)).find(EndCond);
-  if (end == StringRef::npos)
-    end = sizeof(ArMemHdr->Name);
-  assert(end <= sizeof(ArMemHdr->Name) && end > 0);
-  // Don't include the EndCond if there is one.
-  return StringRef(ArMemHdr->Name, end);
-}
-
-// This gets the name looking up long names. Size is the size of the archive
-// member including the header, so the size of any name following the header
-// is checked to make sure it does not overflow.
-Expected<StringRef> ArchiveMemberHeader::getName(uint64_t Size) const {
-
-  // This can be called from the ArchiveMemberHeader constructor when the
-  // archive header is truncated to produce an error message with the name.
-  // Make sure the name field is not truncated.
-  if (Size < offsetof(ArMemHdrType, Name) + sizeof(ArMemHdr->Name)) {
-    uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) -
-                      Parent->getData().data();
-    return malformedError("archive header truncated before the name field "
-                          "for archive member header at offset " +
-                          Twine(ArchiveOffset));
-  }
-
-  // The raw name itself can be invalid.
-  Expected<StringRef> NameOrErr = getRawName();
-  if (!NameOrErr)
-    return NameOrErr.takeError();
-  StringRef Name = NameOrErr.get();
-
-  // Check if it's a special name.
-  if (Name[0] == '/') {
-    if (Name.size() == 1) // Linker member.
-      return Name;
-    if (Name.size() == 2 && Name[1] == '/') // String table.
-      return Name;
-    // It's a long name.
-    // Get the string table offset.
-    std::size_t StringOffset;
-    if (Name.substr(1).rtrim(' ').getAsInteger(10, StringOffset)) {
-      std::string Buf;
-      raw_string_ostream OS(Buf);
-      OS.write_escaped(Name.substr(1).rtrim(' '));
-      OS.flush();
-      uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) -
-                               Parent->getData().data();
-      return malformedError("long name offset characters after the '/' are "
-                            "not all decimal numbers: '" + Buf + "' for "
-                            "archive member header at offset " +
-                            Twine(ArchiveOffset));
-    }
-
-    // Verify it.
-    if (StringOffset >= Parent->getStringTable().size()) {
-      uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) -
-                               Parent->getData().data();
-      return malformedError("long name offset " + Twine(StringOffset) + " past "
-                            "the end of the string table for archive member "
-                            "header at offset " + Twine(ArchiveOffset));
-    }
-
-    // GNU long file names end with a "/\n".
-    if (Parent->kind() == Archive::K_GNU ||
-        Parent->kind() == Archive::K_GNU64) {
-      size_t End = Parent->getStringTable().find('\n', /*From=*/StringOffset);
-      if (End == StringRef::npos || End < 1 ||
-          Parent->getStringTable()[End - 1] != '/') {
-        return malformedError("string table at long name offset " +
-                              Twine(StringOffset) + "not terminated");
-      }
-      return Parent->getStringTable().slice(StringOffset, End - 1);
-    }
-    return Parent->getStringTable().begin() + StringOffset;
-  }
-
-  if (Name.startswith("#1/")) {
-    uint64_t NameLength;
-    if (Name.substr(3).rtrim(' ').getAsInteger(10, NameLength)) {
-      std::string Buf;
-      raw_string_ostream OS(Buf);
-      OS.write_escaped(Name.substr(3).rtrim(' '));
-      OS.flush();
-      uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) -
-                        Parent->getData().data();
-      return malformedError("long name length characters after the #1/ are "
-                            "not all decimal numbers: '" + Buf + "' for "
-                            "archive member header at offset " +
-                            Twine(ArchiveOffset));
-    }
-    if (getSizeOf() + NameLength > Size) {
-      uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) -
-                        Parent->getData().data();
-      return malformedError("long name length: " + Twine(NameLength) +
-                            " extends past the end of the member or archive "
-                            "for archive member header at offset " +
-                            Twine(ArchiveOffset));
-    }
-    return StringRef(reinterpret_cast<const char *>(ArMemHdr) + getSizeOf(),
-                     NameLength).rtrim('\0');
-  }
-
-  // It is not a long name so trim the blanks at the end of the name.
-  if (Name[Name.size() - 1] != '/')
-    return Name.rtrim(' ');
-
-  // It's a simple name.
-  return Name.drop_back(1);
-}
-
-Expected<uint64_t> ArchiveMemberHeader::getSize() const {
-  uint64_t Ret;
-  if (StringRef(ArMemHdr->Size,
-                sizeof(ArMemHdr->Size)).rtrim(" ").getAsInteger(10, Ret)) {
-    std::string Buf;
-    raw_string_ostream OS(Buf);
-    OS.write_escaped(StringRef(ArMemHdr->Size,
-                               sizeof(ArMemHdr->Size)).rtrim(" "));
-    OS.flush();
-    uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
-                      Parent->getData().data();
-    return malformedError("characters in size field in archive header are not "
-                          "all decimal numbers: '" + Buf + "' for archive "
-                          "member header at offset " + Twine(Offset));
-  }
-  return Ret;
-}
-
-Expected<sys::fs::perms> ArchiveMemberHeader::getAccessMode() const {
-  unsigned Ret;
-  if (StringRef(ArMemHdr->AccessMode,
-                sizeof(ArMemHdr->AccessMode)).rtrim(' ').getAsInteger(8, Ret)) {
-    std::string Buf;
-    raw_string_ostream OS(Buf);
-    OS.write_escaped(StringRef(ArMemHdr->AccessMode,
-                               sizeof(ArMemHdr->AccessMode)).rtrim(" "));
-    OS.flush();
-    uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
-                      Parent->getData().data();
-    return malformedError("characters in AccessMode field in archive header "
-                          "are not all decimal numbers: '" + Buf + "' for the "
-                          "archive member header at offset " + Twine(Offset));
-  }
-  return static_cast<sys::fs::perms>(Ret);
-}
-
-Expected<sys::TimePoint<std::chrono::seconds>>
-ArchiveMemberHeader::getLastModified() const {
-  unsigned Seconds;
-  if (StringRef(ArMemHdr->LastModified,
-                sizeof(ArMemHdr->LastModified)).rtrim(' ')
-          .getAsInteger(10, Seconds)) {
-    std::string Buf;
-    raw_string_ostream OS(Buf);
-    OS.write_escaped(StringRef(ArMemHdr->LastModified,
-                               sizeof(ArMemHdr->LastModified)).rtrim(" "));
-    OS.flush();
-    uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
-                      Parent->getData().data();
-    return malformedError("characters in LastModified field in archive header "
-                          "are not all decimal numbers: '" + Buf + "' for the "
-                          "archive member header at offset " + Twine(Offset));
-  }
-
-  return sys::toTimePoint(Seconds);
-}
-
-Expected<unsigned> ArchiveMemberHeader::getUID() const {
-  unsigned Ret;
-  StringRef User = StringRef(ArMemHdr->UID, sizeof(ArMemHdr->UID)).rtrim(' ');
-  if (User.empty())
-    return 0;
-  if (User.getAsInteger(10, Ret)) {
-    std::string Buf;
-    raw_string_ostream OS(Buf);
-    OS.write_escaped(User);
-    OS.flush();
-    uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
-                      Parent->getData().data();
-    return malformedError("characters in UID field in archive header "
-                          "are not all decimal numbers: '" + Buf + "' for the "
-                          "archive member header at offset " + Twine(Offset));
-  }
-  return Ret;
-}
-
-Expected<unsigned> ArchiveMemberHeader::getGID() const {
-  unsigned Ret;
-  StringRef Group = StringRef(ArMemHdr->GID, sizeof(ArMemHdr->GID)).rtrim(' ');
-  if (Group.empty())
-    return 0;
-  if (Group.getAsInteger(10, Ret)) {
-    std::string Buf;
-    raw_string_ostream OS(Buf);
-    OS.write_escaped(Group);
-    OS.flush();
-    uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) -
-                      Parent->getData().data();
-    return malformedError("characters in GID field in archive header "
-                          "are not all decimal numbers: '" + Buf + "' for the "
-                          "archive member header at offset " + Twine(Offset));
-  }
-  return Ret;
-}
-
-Archive::Child::Child(const Archive *Parent, StringRef Data,
-                      uint16_t StartOfFile)
-    : Parent(Parent), Header(Parent, Data.data(), Data.size(), nullptr),
-      Data(Data), StartOfFile(StartOfFile) {
-}
-
-Archive::Child::Child(const Archive *Parent, const char *Start, Error *Err)
-    : Parent(Parent),
-      Header(Parent, Start,
-             Parent
-               ? Parent->getData().size() - (Start - Parent->getData().data())
-               : 0, Err) {
-  if (!Start)
-    return;
-
-  // If we are pointed to real data, Start is not a nullptr, then there must be
-  // a non-null Err pointer available to report malformed data on.  Only in
-  // the case sentinel value is being constructed is Err is permitted to be a
-  // nullptr.
-  assert(Err && "Err can't be nullptr if Start is not a nullptr");
-
-  ErrorAsOutParameter ErrAsOutParam(Err);
-
-  // If there was an error in the construction of the Header
-  // then just return with the error now set.
-  if (*Err)
-    return;
-
-  uint64_t Size = Header.getSizeOf();
-  Data = StringRef(Start, Size);
-  Expected<bool> isThinOrErr = isThinMember();
-  if (!isThinOrErr) {
-    *Err = isThinOrErr.takeError();
-    return;
-  }
-  bool isThin = isThinOrErr.get();
-  if (!isThin) {
-    Expected<uint64_t> MemberSize = getRawSize();
-    if (!MemberSize) {
-      *Err = MemberSize.takeError();
-      return;
-    }
-    Size += MemberSize.get();
-    Data = StringRef(Start, Size);
-  }
-
-  // Setup StartOfFile and PaddingBytes.
-  StartOfFile = Header.getSizeOf();
-  // Don't include attached name.
-  Expected<StringRef> NameOrErr = getRawName();
-  if (!NameOrErr){
-    *Err = NameOrErr.takeError();
-    return;
-  }
-  StringRef Name = NameOrErr.get();
-  if (Name.startswith("#1/")) {
-    uint64_t NameSize;
-    if (Name.substr(3).rtrim(' ').getAsInteger(10, NameSize)) {
-      std::string Buf;
-      raw_string_ostream OS(Buf);
-      OS.write_escaped(Name.substr(3).rtrim(' '));
-      OS.flush();
-      uint64_t Offset = Start - Parent->getData().data();
-      *Err = malformedError("long name length characters after the #1/ are "
-                            "not all decimal numbers: '" + Buf + "' for "
-                            "archive member header at offset " +
-                            Twine(Offset));
-      return;
-    }
-    StartOfFile += NameSize;
-  }
-}
-
-Expected<uint64_t> Archive::Child::getSize() const {
-  if (Parent->IsThin)
-    return Header.getSize();
-  return Data.size() - StartOfFile;
-}
-
-Expected<uint64_t> Archive::Child::getRawSize() const {
-  return Header.getSize();
-}
-
-Expected<bool> Archive::Child::isThinMember() const {
-  Expected<StringRef> NameOrErr = Header.getRawName();
-  if (!NameOrErr)
-    return NameOrErr.takeError();
-  StringRef Name = NameOrErr.get();
-  return Parent->IsThin && Name != "/" && Name != "//";
-}
-
-Expected<std::string> Archive::Child::getFullName() const {
-  Expected<bool> isThin = isThinMember();
-  if (!isThin)
-    return isThin.takeError();
-  assert(isThin.get());
-  Expected<StringRef> NameOrErr = getName();
-  if (!NameOrErr)
-    return NameOrErr.takeError();
-  StringRef Name = *NameOrErr;
-  if (sys::path::is_absolute(Name))
-    return std::string(Name);
-
-  SmallString<128> FullName = sys::path::parent_path(
-      Parent->getMemoryBufferRef().getBufferIdentifier());
-  sys::path::append(FullName, Name);
-  return std::string(FullName.str());
-}
-
-Expected<StringRef> Archive::Child::getBuffer() const {
-  Expected<bool> isThinOrErr = isThinMember();
-  if (!isThinOrErr)
-    return isThinOrErr.takeError();
-  bool isThin = isThinOrErr.get();
-  if (!isThin) {
-    Expected<uint64_t> Size = getSize();
-    if (!Size)
-      return Size.takeError();
-    return StringRef(Data.data() + StartOfFile, Size.get());
-  }
-  Expected<std::string> FullNameOrErr = getFullName();
-  if (!FullNameOrErr)
-    return FullNameOrErr.takeError();
-  const std::string &FullName = *FullNameOrErr;
-  ErrorOr<std::unique_ptr<MemoryBuffer>> Buf = MemoryBuffer::getFile(FullName);
-  if (std::error_code EC = Buf.getError())
-    return errorCodeToError(EC);
-  Parent->ThinBuffers.push_back(std::move(*Buf));
-  return Parent->ThinBuffers.back()->getBuffer();
-}
-
-Expected<Archive::Child> Archive::Child::getNext() const {
-  size_t SpaceToSkip = Data.size();
-  // If it's odd, add 1 to make it even.
-  if (SpaceToSkip & 1)
-    ++SpaceToSkip;
-
-  const char *NextLoc = Data.data() + SpaceToSkip;
-
-  // Check to see if this is at the end of the archive.
-  if (NextLoc == Parent->Data.getBufferEnd())
-    return Child(nullptr, nullptr, nullptr);
-
-  // Check to see if this is past the end of the archive.
-  if (NextLoc > Parent->Data.getBufferEnd()) {
-    std::string Msg("offset to next archive member past the end of the archive "
-                    "after member ");
-    Expected<StringRef> NameOrErr = getName();
-    if (!NameOrErr) {
-      consumeError(NameOrErr.takeError());
-      uint64_t Offset = Data.data() - Parent->getData().data();
-      return malformedError(Msg + "at offset " + Twine(Offset));
-    } else
-      return malformedError(Msg + NameOrErr.get());
-  }
-
-  Error Err = Error::success();
-  Child Ret(Parent, NextLoc, &Err);
-  if (Err)
-    return std::move(Err);
-  return Ret;
-}
-
-uint64_t Archive::Child::getChildOffset() const {
-  const char *a = Parent->Data.getBuffer().data();
-  const char *c = Data.data();
-  uint64_t offset = c - a;
-  return offset;
-}
-
-Expected<StringRef> Archive::Child::getName() const {
-  Expected<uint64_t> RawSizeOrErr = getRawSize();
-  if (!RawSizeOrErr)
-    return RawSizeOrErr.takeError();
-  uint64_t RawSize = RawSizeOrErr.get();
-  Expected<StringRef> NameOrErr = Header.getName(Header.getSizeOf() + RawSize);
-  if (!NameOrErr)
-    return NameOrErr.takeError();
-  StringRef Name = NameOrErr.get();
-  return Name;
-}
-
-Expected<MemoryBufferRef> Archive::Child::getMemoryBufferRef() const {
-  Expected<StringRef> NameOrErr = getName();
-  if (!NameOrErr)
-    return NameOrErr.takeError();
-  StringRef Name = NameOrErr.get();
-  Expected<StringRef> Buf = getBuffer();
-  if (!Buf)
-    return createFileError(Name, Buf.takeError());
-  return MemoryBufferRef(*Buf, Name);
-}
-
-Expected<std::unique_ptr<Binary>>
-Archive::Child::getAsBinary(LLVMContext *Context) const {
-  Expected<MemoryBufferRef> BuffOrErr = getMemoryBufferRef();
-  if (!BuffOrErr)
-    return BuffOrErr.takeError();
-
-  auto BinaryOrErr = createBinary(BuffOrErr.get(), Context);
-  if (BinaryOrErr)
-    return std::move(*BinaryOrErr);
-  return BinaryOrErr.takeError();
-}
-
-Expected<std::unique_ptr<Archive>> Archive::create(MemoryBufferRef Source) {
-  Error Err = Error::success();
-  std::unique_ptr<Archive> Ret(new Archive(Source, Err));
-  if (Err)
-    return std::move(Err);
-  return std::move(Ret);
-}
-
-void Archive::setFirstRegular(const Child &C) {
-  FirstRegularData = C.Data;
-  FirstRegularStartOfFile = C.StartOfFile;
-}
-
-Archive::Archive(MemoryBufferRef Source, Error &Err)
-    : Binary(Binary::ID_Archive, Source) {
-  ErrorAsOutParameter ErrAsOutParam(&Err);
-  StringRef Buffer = Data.getBuffer();
-  // Check for sufficient magic.
-  if (Buffer.startswith(ThinMagic)) {
-    IsThin = true;
-  } else if (Buffer.startswith(Magic)) {
-    IsThin = false;
-  } else {
-    Err = make_error<GenericBinaryError>("file too small to be an archive",
-                                         object_error::invalid_file_type);
-    return;
-  }
-
-  // Make sure Format is initialized before any call to
-  // ArchiveMemberHeader::getName() is made.  This could be a valid empty
-  // archive which is the same in all formats.  So claiming it to be gnu to is
-  // fine if not totally correct before we look for a string table or table of
-  // contents.
-  Format = K_GNU;
-
-  // Get the special members.
-  child_iterator I = child_begin(Err, false);
-  if (Err)
-    return;
-  child_iterator E = child_end();
-
-  // See if this is a valid empty archive and if so return.
-  if (I == E) {
-    Err = Error::success();
-    return;
-  }
-  const Child *C = &*I;
-
-  auto Increment = [&]() {
-    ++I;
-    if (Err)
-      return true;
-    C = &*I;
-    return false;
-  };
-
-  Expected<StringRef> NameOrErr = C->getRawName();
-  if (!NameOrErr) {
-    Err = NameOrErr.takeError();
-    return;
-  }
-  StringRef Name = NameOrErr.get();
-
-  // Below is the pattern that is used to figure out the archive format
-  // GNU archive format
-  //  First member : / (may exist, if it exists, points to the symbol table )
-  //  Second member : // (may exist, if it exists, points to the string table)
-  //  Note : The string table is used if the filename exceeds 15 characters
-  // BSD archive format
-  //  First member : __.SYMDEF or "__.SYMDEF SORTED" (the symbol table)
-  //  There is no string table, if the filename exceeds 15 characters or has a
-  //  embedded space, the filename has #1/<size>, The size represents the size
-  //  of the filename that needs to be read after the archive header
-  // COFF archive format
-  //  First member : /
-  //  Second member : / (provides a directory of symbols)
-  //  Third member : // (may exist, if it exists, contains the string table)
-  //  Note: Microsoft PE/COFF Spec 8.3 says that the third member is present
-  //  even if the string table is empty. However, lib.exe does not in fact
-  //  seem to create the third member if there's no member whose filename
-  //  exceeds 15 characters. So the third member is optional.
-
-  if (Name == "__.SYMDEF" || Name == "__.SYMDEF_64") {
-    if (Name == "__.SYMDEF")
-      Format = K_BSD;
-    else // Name == "__.SYMDEF_64"
-      Format = K_DARWIN64;
-    // We know that the symbol table is not an external file, but we still must
-    // check any Expected<> return value.
-    Expected<StringRef> BufOrErr = C->getBuffer();
-    if (!BufOrErr) {
-      Err = BufOrErr.takeError();
-      return;
-    }
-    SymbolTable = BufOrErr.get();
-    if (Increment())
-      return;
-    setFirstRegular(*C);
-
-    Err = Error::success();
-    return;
-  }
-
-  if (Name.startswith("#1/")) {
-    Format = K_BSD;
-    // We know this is BSD, so getName will work since there is no string table.
-    Expected<StringRef> NameOrErr = C->getName();
-    if (!NameOrErr) {
-      Err = NameOrErr.takeError();
-      return;
-    }
-    Name = NameOrErr.get();
-    if (Name == "__.SYMDEF SORTED" || Name == "__.SYMDEF") {
-      // We know that the symbol table is not an external file, but we still
-      // must check any Expected<> return value.
-      Expected<StringRef> BufOrErr = C->getBuffer();
-      if (!BufOrErr) {
-        Err = BufOrErr.takeError();
-        return;
-      }
-      SymbolTable = BufOrErr.get();
-      if (Increment())
-        return;
-    }
-    else if (Name == "__.SYMDEF_64 SORTED" || Name == "__.SYMDEF_64") {
-      Format = K_DARWIN64;
-      // We know that the symbol table is not an external file, but we still
-      // must check any Expected<> return value.
-      Expected<StringRef> BufOrErr = C->getBuffer();
-      if (!BufOrErr) {
-        Err = BufOrErr.takeError();
-        return;
-      }
-      SymbolTable = BufOrErr.get();
-      if (Increment())
-        return;
-    }
-    setFirstRegular(*C);
-    return;
-  }
-
-  // MIPS 64-bit ELF archives use a special format of a symbol table.
-  // This format is marked by `ar_name` field equals to "/SYM64/".
-  // For detailed description see page 96 in the following document:
-  // http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf
-
-  bool has64SymTable = false;
-  if (Name == "/" || Name == "/SYM64/") {
-    // We know that the symbol table is not an external file, but we still
-    // must check any Expected<> return value.
-    Expected<StringRef> BufOrErr = C->getBuffer();
-    if (!BufOrErr) {
-      Err = BufOrErr.takeError();
-      return;
-    }
-    SymbolTable = BufOrErr.get();
-    if (Name == "/SYM64/")
-      has64SymTable = true;
-
-    if (Increment())
-      return;
-    if (I == E) {
-      Err = Error::success();
-      return;
-    }
-    Expected<StringRef> NameOrErr = C->getRawName();
-    if (!NameOrErr) {
-      Err = NameOrErr.takeError();
-      return;
-    }
-    Name = NameOrErr.get();
-  }
-
-  if (Name == "//") {
-    Format = has64SymTable ? K_GNU64 : K_GNU;
-    // The string table is never an external member, but we still
-    // must check any Expected<> return value.
-    Expected<StringRef> BufOrErr = C->getBuffer();
-    if (!BufOrErr) {
-      Err = BufOrErr.takeError();
-      return;
-    }
-    StringTable = BufOrErr.get();
-    if (Increment())
-      return;
-    setFirstRegular(*C);
-    Err = Error::success();
-    return;
-  }
-
-  if (Name[0] != '/') {
-    Format = has64SymTable ? K_GNU64 : K_GNU;
-    setFirstRegular(*C);
-    Err = Error::success();
-    return;
-  }
-
-  if (Name != "/") {
-    Err = errorCodeToError(object_error::parse_failed);
-    return;
-  }
-
-  Format = K_COFF;
-  // We know that the symbol table is not an external file, but we still
-  // must check any Expected<> return value.
-  Expected<StringRef> BufOrErr = C->getBuffer();
-  if (!BufOrErr) {
-    Err = BufOrErr.takeError();
-    return;
-  }
-  SymbolTable = BufOrErr.get();
-
-  if (Increment())
-    return;
-
-  if (I == E) {
-    setFirstRegular(*C);
-    Err = Error::success();
-    return;
-  }
-
-  NameOrErr = C->getRawName();
-  if (!NameOrErr) {
-    Err = NameOrErr.takeError();
-    return;
-  }
-  Name = NameOrErr.get();
-
-  if (Name == "//") {
-    // The string table is never an external member, but we still
-    // must check any Expected<> return value.
-    Expected<StringRef> BufOrErr = C->getBuffer();
-    if (!BufOrErr) {
-      Err = BufOrErr.takeError();
-      return;
-    }
-    StringTable = BufOrErr.get();
-    if (Increment())
-      return;
-  }
-
-  setFirstRegular(*C);
-  Err = Error::success();
-}
-
-Archive::child_iterator Archive::child_begin(Error &Err,
-                                             bool SkipInternal) const {
-  if (isEmpty())
-    return child_end();
-
-  if (SkipInternal)
-    return child_iterator::itr(
-        Child(this, FirstRegularData, FirstRegularStartOfFile), Err);
-
-  const char *Loc = Data.getBufferStart() + strlen(Magic);
-  Child C(this, Loc, &Err);
-  if (Err)
-    return child_end();
-  return child_iterator::itr(C, Err);
-}
-
-Archive::child_iterator Archive::child_end() const {
-  return child_iterator::end(Child(nullptr, nullptr, nullptr));
-}
-
-StringRef Archive::Symbol::getName() const {
-  return Parent->getSymbolTable().begin() + StringIndex;
-}
-
-Expected<Archive::Child> Archive::Symbol::getMember() const {
-  const char *Buf = Parent->getSymbolTable().begin();
-  const char *Offsets = Buf;
-  if (Parent->kind() == K_GNU64 || Parent->kind() == K_DARWIN64)
-    Offsets += sizeof(uint64_t);
-  else
-    Offsets += sizeof(uint32_t);
-  uint64_t Offset = 0;
-  if (Parent->kind() == K_GNU) {
-    Offset = read32be(Offsets + SymbolIndex * 4);
-  } else if (Parent->kind() == K_GNU64) {
-    Offset = read64be(Offsets + SymbolIndex * 8);
-  } else if (Parent->kind() == K_BSD) {
-    // The SymbolIndex is an index into the ranlib structs that start at
-    // Offsets (the first uint32_t is the number of bytes of the ranlib
-    // structs).  The ranlib structs are a pair of uint32_t's the first
-    // being a string table offset and the second being the offset into
-    // the archive of the member that defines the symbol.  Which is what
-    // is needed here.
-    Offset = read32le(Offsets + SymbolIndex * 8 + 4);
-  } else if (Parent->kind() == K_DARWIN64) {
-    // The SymbolIndex is an index into the ranlib_64 structs that start at
-    // Offsets (the first uint64_t is the number of bytes of the ranlib_64
-    // structs).  The ranlib_64 structs are a pair of uint64_t's the first
-    // being a string table offset and the second being the offset into
-    // the archive of the member that defines the symbol.  Which is what
-    // is needed here.
-    Offset = read64le(Offsets + SymbolIndex * 16 + 8);
-  } else {
-    // Skip offsets.
-    uint32_t MemberCount = read32le(Buf);
-    Buf += MemberCount * 4 + 4;
-
-    uint32_t SymbolCount = read32le(Buf);
-    if (SymbolIndex >= SymbolCount)
-      return errorCodeToError(object_error::parse_failed);
-
-    // Skip SymbolCount to get to the indices table.
-    const char *Indices = Buf + 4;
-
-    // Get the index of the offset in the file member offset table for this
-    // symbol.
-    uint16_t OffsetIndex = read16le(Indices + SymbolIndex * 2);
-    // Subtract 1 since OffsetIndex is 1 based.
-    --OffsetIndex;
-
-    if (OffsetIndex >= MemberCount)
-      return errorCodeToError(object_error::parse_failed);
-
-    Offset = read32le(Offsets + OffsetIndex * 4);
-  }
-
-  const char *Loc = Parent->getData().begin() + Offset;
-  Error Err = Error::success();
-  Child C(Parent, Loc, &Err);
-  if (Err)
-    return std::move(Err);
-  return C;
-}
-
-Archive::Symbol Archive::Symbol::getNext() const {
-  Symbol t(*this);
-  if (Parent->kind() == K_BSD) {
-    // t.StringIndex is an offset from the start of the __.SYMDEF or
-    // "__.SYMDEF SORTED" member into the string table for the ranlib
-    // struct indexed by t.SymbolIndex .  To change t.StringIndex to the
-    // offset in the string table for t.SymbolIndex+1 we subtract the
-    // its offset from the start of the string table for t.SymbolIndex
-    // and add the offset of the string table for t.SymbolIndex+1.
-
-    // The __.SYMDEF or "__.SYMDEF SORTED" member starts with a uint32_t
-    // which is the number of bytes of ranlib structs that follow.  The ranlib
-    // structs are a pair of uint32_t's the first being a string table offset
-    // and the second being the offset into the archive of the member that
-    // define the symbol. After that the next uint32_t is the byte count of
-    // the string table followed by the string table.
-    const char *Buf = Parent->getSymbolTable().begin();
-    uint32_t RanlibCount = 0;
-    RanlibCount = read32le(Buf) / 8;
-    // If t.SymbolIndex + 1 will be past the count of symbols (the RanlibCount)
-    // don't change the t.StringIndex as we don't want to reference a ranlib
-    // past RanlibCount.
-    if (t.SymbolIndex + 1 < RanlibCount) {
-      const char *Ranlibs = Buf + 4;
-      uint32_t CurRanStrx = 0;
-      uint32_t NextRanStrx = 0;
-      CurRanStrx = read32le(Ranlibs + t.SymbolIndex * 8);
-      NextRanStrx = read32le(Ranlibs + (t.SymbolIndex + 1) * 8);
-      t.StringIndex -= CurRanStrx;
-      t.StringIndex += NextRanStrx;
-    }
-  } else {
-    // Go to one past next null.
-    t.StringIndex = Parent->getSymbolTable().find('\0', t.StringIndex) + 1;
-  }
-  ++t.SymbolIndex;
-  return t;
-}
-
-Archive::symbol_iterator Archive::symbol_begin() const {
-  if (!hasSymbolTable())
-    return symbol_iterator(Symbol(this, 0, 0));
-
-  const char *buf = getSymbolTable().begin();
-  if (kind() == K_GNU) {
-    uint32_t symbol_count = 0;
-    symbol_count = read32be(buf);
-    buf += sizeof(uint32_t) + (symbol_count * (sizeof(uint32_t)));
-  } else if (kind() == K_GNU64) {
-    uint64_t symbol_count = read64be(buf);
-    buf += sizeof(uint64_t) + (symbol_count * (sizeof(uint64_t)));
-  } else if (kind() == K_BSD) {
-    // The __.SYMDEF or "__.SYMDEF SORTED" member starts with a uint32_t
-    // which is the number of bytes of ranlib structs that follow.  The ranlib
-    // structs are a pair of uint32_t's the first being a string table offset
-    // and the second being the offset into the archive of the member that
-    // define the symbol. After that the next uint32_t is the byte count of
-    // the string table followed by the string table.
-    uint32_t ranlib_count = 0;
-    ranlib_count = read32le(buf) / 8;
-    const char *ranlibs = buf + 4;
-    uint32_t ran_strx = 0;
-    ran_strx = read32le(ranlibs);
-    buf += sizeof(uint32_t) + (ranlib_count * (2 * (sizeof(uint32_t))));
-    // Skip the byte count of the string table.
-    buf += sizeof(uint32_t);
-    buf += ran_strx;
-  } else if (kind() == K_DARWIN64) {
-    // The __.SYMDEF_64 or "__.SYMDEF_64 SORTED" member starts with a uint64_t
-    // which is the number of bytes of ranlib_64 structs that follow.  The
-    // ranlib_64 structs are a pair of uint64_t's the first being a string
-    // table offset and the second being the offset into the archive of the
-    // member that define the symbol. After that the next uint64_t is the byte
-    // count of the string table followed by the string table.
-    uint64_t ranlib_count = 0;
-    ranlib_count = read64le(buf) / 16;
-    const char *ranlibs = buf + 8;
-    uint64_t ran_strx = 0;
-    ran_strx = read64le(ranlibs);
-    buf += sizeof(uint64_t) + (ranlib_count * (2 * (sizeof(uint64_t))));
-    // Skip the byte count of the string table.
-    buf += sizeof(uint64_t);
-    buf += ran_strx;
-  } else {
-    uint32_t member_count = 0;
-    uint32_t symbol_count = 0;
-    member_count = read32le(buf);
-    buf += 4 + (member_count * 4); // Skip offsets.
-    symbol_count = read32le(buf);
-    buf += 4 + (symbol_count * 2); // Skip indices.
-  }
-  uint32_t string_start_offset = buf - getSymbolTable().begin();
-  return symbol_iterator(Symbol(this, 0, string_start_offset));
-}
-
-Archive::symbol_iterator Archive::symbol_end() const {
-  return symbol_iterator(Symbol(this, getNumberOfSymbols(), 0));
-}
-
-uint32_t Archive::getNumberOfSymbols() const {
-  if (!hasSymbolTable())
-    return 0;
-  const char *buf = getSymbolTable().begin();
-  if (kind() == K_GNU)
-    return read32be(buf);
-  if (kind() == K_GNU64)
-    return read64be(buf);
-  if (kind() == K_BSD)
-    return read32le(buf) / 8;
-  if (kind() == K_DARWIN64)
-    return read64le(buf) / 16;
-  uint32_t member_count = 0;
-  member_count = read32le(buf);
-  buf += 4 + (member_count * 4); // Skip offsets.
-  return read32le(buf);
-}
-
-Expected<Optional<Archive::Child>> Archive::findSym(StringRef name) const {
-  Archive::symbol_iterator bs = symbol_begin();
-  Archive::symbol_iterator es = symbol_end();
-
-  for (; bs != es; ++bs) {
-    StringRef SymName = bs->getName();
-    if (SymName == name) {
-      if (auto MemberOrErr = bs->getMember())
-        return Child(*MemberOrErr);
-      else
-        return MemberOrErr.takeError();
-    }
-  }
-  return Optional<Child>();
-}
-
-// Returns true if archive file contains no member file.
-bool Archive::isEmpty() const { return Data.getBufferSize() == 8; }
-
-bool Archive::hasSymbolTable() const { return !SymbolTable.empty(); }
+ 
+void Archive::anchor() {} 
+ 
+static Error 
+malformedError(Twine Msg) { 
+  std::string StringMsg = "truncated or malformed archive (" + Msg.str() + ")"; 
+  return make_error<GenericBinaryError>(std::move(StringMsg), 
+                                        object_error::parse_failed); 
+} 
+ 
+ArchiveMemberHeader::ArchiveMemberHeader(const Archive *Parent, 
+                                         const char *RawHeaderPtr, 
+                                         uint64_t Size, Error *Err) 
+    : Parent(Parent), 
+      ArMemHdr(reinterpret_cast<const ArMemHdrType *>(RawHeaderPtr)) { 
+  if (RawHeaderPtr == nullptr) 
+    return; 
+  ErrorAsOutParameter ErrAsOutParam(Err); 
+ 
+  if (Size < sizeof(ArMemHdrType)) { 
+    if (Err) { 
+      std::string Msg("remaining size of archive too small for next archive " 
+                      "member header "); 
+      Expected<StringRef> NameOrErr = getName(Size); 
+      if (!NameOrErr) { 
+        consumeError(NameOrErr.takeError()); 
+        uint64_t Offset = RawHeaderPtr - Parent->getData().data(); 
+        *Err = malformedError(Msg + "at offset " + Twine(Offset)); 
+      } else 
+        *Err = malformedError(Msg + "for " + NameOrErr.get()); 
+    } 
+    return; 
+  } 
+  if (ArMemHdr->Terminator[0] != '`' || ArMemHdr->Terminator[1] != '\n') { 
+    if (Err) { 
+      std::string Buf; 
+      raw_string_ostream OS(Buf); 
+      OS.write_escaped(StringRef(ArMemHdr->Terminator, 
+                                 sizeof(ArMemHdr->Terminator))); 
+      OS.flush(); 
+      std::string Msg("terminator characters in archive member \"" + Buf + 
+                      "\" not the correct \"`\\n\" values for the archive " 
+                      "member header "); 
+      Expected<StringRef> NameOrErr = getName(Size); 
+      if (!NameOrErr) { 
+        consumeError(NameOrErr.takeError()); 
+        uint64_t Offset = RawHeaderPtr - Parent->getData().data(); 
+        *Err = malformedError(Msg + "at offset " + Twine(Offset)); 
+      } else 
+        *Err = malformedError(Msg + "for " + NameOrErr.get()); 
+    } 
+    return; 
+  } 
+} 
+ 
+// This gets the raw name from the ArMemHdr->Name field and checks that it is 
+// valid for the kind of archive.  If it is not valid it returns an Error. 
+Expected<StringRef> ArchiveMemberHeader::getRawName() const { 
+  char EndCond; 
+  auto Kind = Parent->kind(); 
+  if (Kind == Archive::K_BSD || Kind == Archive::K_DARWIN64) { 
+    if (ArMemHdr->Name[0] == ' ') { 
+      uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) - 
+                        Parent->getData().data(); 
+      return malformedError("name contains a leading space for archive member " 
+                            "header at offset " + Twine(Offset)); 
+    } 
+    EndCond = ' '; 
+  } 
+  else if (ArMemHdr->Name[0] == '/' || ArMemHdr->Name[0] == '#') 
+    EndCond = ' '; 
+  else 
+    EndCond = '/'; 
+  StringRef::size_type end = 
+      StringRef(ArMemHdr->Name, sizeof(ArMemHdr->Name)).find(EndCond); 
+  if (end == StringRef::npos) 
+    end = sizeof(ArMemHdr->Name); 
+  assert(end <= sizeof(ArMemHdr->Name) && end > 0); 
+  // Don't include the EndCond if there is one. 
+  return StringRef(ArMemHdr->Name, end); 
+} 
+ 
+// This gets the name looking up long names. Size is the size of the archive 
+// member including the header, so the size of any name following the header 
+// is checked to make sure it does not overflow. 
+Expected<StringRef> ArchiveMemberHeader::getName(uint64_t Size) const { 
+ 
+  // This can be called from the ArchiveMemberHeader constructor when the 
+  // archive header is truncated to produce an error message with the name. 
+  // Make sure the name field is not truncated. 
+  if (Size < offsetof(ArMemHdrType, Name) + sizeof(ArMemHdr->Name)) { 
+    uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) - 
+                      Parent->getData().data(); 
+    return malformedError("archive header truncated before the name field " 
+                          "for archive member header at offset " + 
+                          Twine(ArchiveOffset)); 
+  } 
+ 
+  // The raw name itself can be invalid. 
+  Expected<StringRef> NameOrErr = getRawName(); 
+  if (!NameOrErr) 
+    return NameOrErr.takeError(); 
+  StringRef Name = NameOrErr.get(); 
+ 
+  // Check if it's a special name. 
+  if (Name[0] == '/') { 
+    if (Name.size() == 1) // Linker member. 
+      return Name; 
+    if (Name.size() == 2 && Name[1] == '/') // String table. 
+      return Name; 
+    // It's a long name. 
+    // Get the string table offset. 
+    std::size_t StringOffset; 
+    if (Name.substr(1).rtrim(' ').getAsInteger(10, StringOffset)) { 
+      std::string Buf; 
+      raw_string_ostream OS(Buf); 
+      OS.write_escaped(Name.substr(1).rtrim(' ')); 
+      OS.flush(); 
+      uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) - 
+                               Parent->getData().data(); 
+      return malformedError("long name offset characters after the '/' are " 
+                            "not all decimal numbers: '" + Buf + "' for " 
+                            "archive member header at offset " + 
+                            Twine(ArchiveOffset)); 
+    } 
+ 
+    // Verify it. 
+    if (StringOffset >= Parent->getStringTable().size()) { 
+      uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) - 
+                               Parent->getData().data(); 
+      return malformedError("long name offset " + Twine(StringOffset) + " past " 
+                            "the end of the string table for archive member " 
+                            "header at offset " + Twine(ArchiveOffset)); 
+    } 
+ 
+    // GNU long file names end with a "/\n". 
+    if (Parent->kind() == Archive::K_GNU || 
+        Parent->kind() == Archive::K_GNU64) { 
+      size_t End = Parent->getStringTable().find('\n', /*From=*/StringOffset); 
+      if (End == StringRef::npos || End < 1 || 
+          Parent->getStringTable()[End - 1] != '/') { 
+        return malformedError("string table at long name offset " + 
+                              Twine(StringOffset) + "not terminated"); 
+      } 
+      return Parent->getStringTable().slice(StringOffset, End - 1); 
+    } 
+    return Parent->getStringTable().begin() + StringOffset; 
+  } 
+ 
+  if (Name.startswith("#1/")) { 
+    uint64_t NameLength; 
+    if (Name.substr(3).rtrim(' ').getAsInteger(10, NameLength)) { 
+      std::string Buf; 
+      raw_string_ostream OS(Buf); 
+      OS.write_escaped(Name.substr(3).rtrim(' ')); 
+      OS.flush(); 
+      uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) - 
+                        Parent->getData().data(); 
+      return malformedError("long name length characters after the #1/ are " 
+                            "not all decimal numbers: '" + Buf + "' for " 
+                            "archive member header at offset " + 
+                            Twine(ArchiveOffset)); 
+    } 
+    if (getSizeOf() + NameLength > Size) { 
+      uint64_t ArchiveOffset = reinterpret_cast<const char *>(ArMemHdr) - 
+                        Parent->getData().data(); 
+      return malformedError("long name length: " + Twine(NameLength) + 
+                            " extends past the end of the member or archive " 
+                            "for archive member header at offset " + 
+                            Twine(ArchiveOffset)); 
+    } 
+    return StringRef(reinterpret_cast<const char *>(ArMemHdr) + getSizeOf(), 
+                     NameLength).rtrim('\0'); 
+  } 
+ 
+  // It is not a long name so trim the blanks at the end of the name. 
+  if (Name[Name.size() - 1] != '/') 
+    return Name.rtrim(' '); 
+ 
+  // It's a simple name. 
+  return Name.drop_back(1); 
+} 
+ 
+Expected<uint64_t> ArchiveMemberHeader::getSize() const { 
+  uint64_t Ret; 
+  if (StringRef(ArMemHdr->Size, 
+                sizeof(ArMemHdr->Size)).rtrim(" ").getAsInteger(10, Ret)) { 
+    std::string Buf; 
+    raw_string_ostream OS(Buf); 
+    OS.write_escaped(StringRef(ArMemHdr->Size, 
+                               sizeof(ArMemHdr->Size)).rtrim(" ")); 
+    OS.flush(); 
+    uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) - 
+                      Parent->getData().data(); 
+    return malformedError("characters in size field in archive header are not " 
+                          "all decimal numbers: '" + Buf + "' for archive " 
+                          "member header at offset " + Twine(Offset)); 
+  } 
+  return Ret; 
+} 
+ 
+Expected<sys::fs::perms> ArchiveMemberHeader::getAccessMode() const { 
+  unsigned Ret; 
+  if (StringRef(ArMemHdr->AccessMode, 
+                sizeof(ArMemHdr->AccessMode)).rtrim(' ').getAsInteger(8, Ret)) { 
+    std::string Buf; 
+    raw_string_ostream OS(Buf); 
+    OS.write_escaped(StringRef(ArMemHdr->AccessMode, 
+                               sizeof(ArMemHdr->AccessMode)).rtrim(" ")); 
+    OS.flush(); 
+    uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) - 
+                      Parent->getData().data(); 
+    return malformedError("characters in AccessMode field in archive header " 
+                          "are not all decimal numbers: '" + Buf + "' for the " 
+                          "archive member header at offset " + Twine(Offset)); 
+  } 
+  return static_cast<sys::fs::perms>(Ret); 
+} 
+ 
+Expected<sys::TimePoint<std::chrono::seconds>> 
+ArchiveMemberHeader::getLastModified() const { 
+  unsigned Seconds; 
+  if (StringRef(ArMemHdr->LastModified, 
+                sizeof(ArMemHdr->LastModified)).rtrim(' ') 
+          .getAsInteger(10, Seconds)) { 
+    std::string Buf; 
+    raw_string_ostream OS(Buf); 
+    OS.write_escaped(StringRef(ArMemHdr->LastModified, 
+                               sizeof(ArMemHdr->LastModified)).rtrim(" ")); 
+    OS.flush(); 
+    uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) - 
+                      Parent->getData().data(); 
+    return malformedError("characters in LastModified field in archive header " 
+                          "are not all decimal numbers: '" + Buf + "' for the " 
+                          "archive member header at offset " + Twine(Offset)); 
+  } 
+ 
+  return sys::toTimePoint(Seconds); 
+} 
+ 
+Expected<unsigned> ArchiveMemberHeader::getUID() const { 
+  unsigned Ret; 
+  StringRef User = StringRef(ArMemHdr->UID, sizeof(ArMemHdr->UID)).rtrim(' '); 
+  if (User.empty()) 
+    return 0; 
+  if (User.getAsInteger(10, Ret)) { 
+    std::string Buf; 
+    raw_string_ostream OS(Buf); 
+    OS.write_escaped(User); 
+    OS.flush(); 
+    uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) - 
+                      Parent->getData().data(); 
+    return malformedError("characters in UID field in archive header " 
+                          "are not all decimal numbers: '" + Buf + "' for the " 
+                          "archive member header at offset " + Twine(Offset)); 
+  } 
+  return Ret; 
+} 
+ 
+Expected<unsigned> ArchiveMemberHeader::getGID() const { 
+  unsigned Ret; 
+  StringRef Group = StringRef(ArMemHdr->GID, sizeof(ArMemHdr->GID)).rtrim(' '); 
+  if (Group.empty()) 
+    return 0; 
+  if (Group.getAsInteger(10, Ret)) { 
+    std::string Buf; 
+    raw_string_ostream OS(Buf); 
+    OS.write_escaped(Group); 
+    OS.flush(); 
+    uint64_t Offset = reinterpret_cast<const char *>(ArMemHdr) - 
+                      Parent->getData().data(); 
+    return malformedError("characters in GID field in archive header " 
+                          "are not all decimal numbers: '" + Buf + "' for the " 
+                          "archive member header at offset " + Twine(Offset)); 
+  } 
+  return Ret; 
+} 
+ 
+Archive::Child::Child(const Archive *Parent, StringRef Data, 
+                      uint16_t StartOfFile) 
+    : Parent(Parent), Header(Parent, Data.data(), Data.size(), nullptr), 
+      Data(Data), StartOfFile(StartOfFile) { 
+} 
+ 
+Archive::Child::Child(const Archive *Parent, const char *Start, Error *Err) 
+    : Parent(Parent), 
+      Header(Parent, Start, 
+             Parent 
+               ? Parent->getData().size() - (Start - Parent->getData().data()) 
+               : 0, Err) { 
+  if (!Start) 
+    return; 
+ 
+  // If we are pointed to real data, Start is not a nullptr, then there must be 
+  // a non-null Err pointer available to report malformed data on.  Only in 
+  // the case sentinel value is being constructed is Err is permitted to be a 
+  // nullptr. 
+  assert(Err && "Err can't be nullptr if Start is not a nullptr"); 
+ 
+  ErrorAsOutParameter ErrAsOutParam(Err); 
+ 
+  // If there was an error in the construction of the Header 
+  // then just return with the error now set. 
+  if (*Err) 
+    return; 
+ 
+  uint64_t Size = Header.getSizeOf(); 
+  Data = StringRef(Start, Size); 
+  Expected<bool> isThinOrErr = isThinMember(); 
+  if (!isThinOrErr) { 
+    *Err = isThinOrErr.takeError(); 
+    return; 
+  } 
+  bool isThin = isThinOrErr.get(); 
+  if (!isThin) { 
+    Expected<uint64_t> MemberSize = getRawSize(); 
+    if (!MemberSize) { 
+      *Err = MemberSize.takeError(); 
+      return; 
+    } 
+    Size += MemberSize.get(); 
+    Data = StringRef(Start, Size); 
+  } 
+ 
+  // Setup StartOfFile and PaddingBytes. 
+  StartOfFile = Header.getSizeOf(); 
+  // Don't include attached name. 
+  Expected<StringRef> NameOrErr = getRawName(); 
+  if (!NameOrErr){ 
+    *Err = NameOrErr.takeError(); 
+    return; 
+  } 
+  StringRef Name = NameOrErr.get(); 
+  if (Name.startswith("#1/")) { 
+    uint64_t NameSize; 
+    if (Name.substr(3).rtrim(' ').getAsInteger(10, NameSize)) { 
+      std::string Buf; 
+      raw_string_ostream OS(Buf); 
+      OS.write_escaped(Name.substr(3).rtrim(' ')); 
+      OS.flush(); 
+      uint64_t Offset = Start - Parent->getData().data(); 
+      *Err = malformedError("long name length characters after the #1/ are " 
+                            "not all decimal numbers: '" + Buf + "' for " 
+                            "archive member header at offset " + 
+                            Twine(Offset)); 
+      return; 
+    } 
+    StartOfFile += NameSize; 
+  } 
+} 
+ 
+Expected<uint64_t> Archive::Child::getSize() const { 
+  if (Parent->IsThin) 
+    return Header.getSize(); 
+  return Data.size() - StartOfFile; 
+} 
+ 
+Expected<uint64_t> Archive::Child::getRawSize() const { 
+  return Header.getSize(); 
+} 
+ 
+Expected<bool> Archive::Child::isThinMember() const { 
+  Expected<StringRef> NameOrErr = Header.getRawName(); 
+  if (!NameOrErr) 
+    return NameOrErr.takeError(); 
+  StringRef Name = NameOrErr.get(); 
+  return Parent->IsThin && Name != "/" && Name != "//"; 
+} 
+ 
+Expected<std::string> Archive::Child::getFullName() const { 
+  Expected<bool> isThin = isThinMember(); 
+  if (!isThin) 
+    return isThin.takeError(); 
+  assert(isThin.get()); 
+  Expected<StringRef> NameOrErr = getName(); 
+  if (!NameOrErr) 
+    return NameOrErr.takeError(); 
+  StringRef Name = *NameOrErr; 
+  if (sys::path::is_absolute(Name)) 
+    return std::string(Name); 
+ 
+  SmallString<128> FullName = sys::path::parent_path( 
+      Parent->getMemoryBufferRef().getBufferIdentifier()); 
+  sys::path::append(FullName, Name); 
+  return std::string(FullName.str()); 
+} 
+ 
+Expected<StringRef> Archive::Child::getBuffer() const { 
+  Expected<bool> isThinOrErr = isThinMember(); 
+  if (!isThinOrErr) 
+    return isThinOrErr.takeError(); 
+  bool isThin = isThinOrErr.get(); 
+  if (!isThin) { 
+    Expected<uint64_t> Size = getSize(); 
+    if (!Size) 
+      return Size.takeError(); 
+    return StringRef(Data.data() + StartOfFile, Size.get()); 
+  } 
+  Expected<std::string> FullNameOrErr = getFullName(); 
+  if (!FullNameOrErr) 
+    return FullNameOrErr.takeError(); 
+  const std::string &FullName = *FullNameOrErr; 
+  ErrorOr<std::unique_ptr<MemoryBuffer>> Buf = MemoryBuffer::getFile(FullName); 
+  if (std::error_code EC = Buf.getError()) 
+    return errorCodeToError(EC); 
+  Parent->ThinBuffers.push_back(std::move(*Buf)); 
+  return Parent->ThinBuffers.back()->getBuffer(); 
+} 
+ 
+Expected<Archive::Child> Archive::Child::getNext() const { 
+  size_t SpaceToSkip = Data.size(); 
+  // If it's odd, add 1 to make it even. 
+  if (SpaceToSkip & 1) 
+    ++SpaceToSkip; 
+ 
+  const char *NextLoc = Data.data() + SpaceToSkip; 
+ 
+  // Check to see if this is at the end of the archive. 
+  if (NextLoc == Parent->Data.getBufferEnd()) 
+    return Child(nullptr, nullptr, nullptr); 
+ 
+  // Check to see if this is past the end of the archive. 
+  if (NextLoc > Parent->Data.getBufferEnd()) { 
+    std::string Msg("offset to next archive member past the end of the archive " 
+                    "after member "); 
+    Expected<StringRef> NameOrErr = getName(); 
+    if (!NameOrErr) { 
+      consumeError(NameOrErr.takeError()); 
+      uint64_t Offset = Data.data() - Parent->getData().data(); 
+      return malformedError(Msg + "at offset " + Twine(Offset)); 
+    } else 
+      return malformedError(Msg + NameOrErr.get()); 
+  } 
+ 
+  Error Err = Error::success(); 
+  Child Ret(Parent, NextLoc, &Err); 
+  if (Err) 
+    return std::move(Err); 
+  return Ret; 
+} 
+ 
+uint64_t Archive::Child::getChildOffset() const { 
+  const char *a = Parent->Data.getBuffer().data(); 
+  const char *c = Data.data(); 
+  uint64_t offset = c - a; 
+  return offset; 
+} 
+ 
+Expected<StringRef> Archive::Child::getName() const { 
+  Expected<uint64_t> RawSizeOrErr = getRawSize(); 
+  if (!RawSizeOrErr) 
+    return RawSizeOrErr.takeError(); 
+  uint64_t RawSize = RawSizeOrErr.get(); 
+  Expected<StringRef> NameOrErr = Header.getName(Header.getSizeOf() + RawSize); 
+  if (!NameOrErr) 
+    return NameOrErr.takeError(); 
+  StringRef Name = NameOrErr.get(); 
+  return Name; 
+} 
+ 
+Expected<MemoryBufferRef> Archive::Child::getMemoryBufferRef() const { 
+  Expected<StringRef> NameOrErr = getName(); 
+  if (!NameOrErr) 
+    return NameOrErr.takeError(); 
+  StringRef Name = NameOrErr.get(); 
+  Expected<StringRef> Buf = getBuffer(); 
+  if (!Buf) 
+    return createFileError(Name, Buf.takeError()); 
+  return MemoryBufferRef(*Buf, Name); 
+} 
+ 
+Expected<std::unique_ptr<Binary>> 
+Archive::Child::getAsBinary(LLVMContext *Context) const { 
+  Expected<MemoryBufferRef> BuffOrErr = getMemoryBufferRef(); 
+  if (!BuffOrErr) 
+    return BuffOrErr.takeError(); 
+ 
+  auto BinaryOrErr = createBinary(BuffOrErr.get(), Context); 
+  if (BinaryOrErr) 
+    return std::move(*BinaryOrErr); 
+  return BinaryOrErr.takeError(); 
+} 
+ 
+Expected<std::unique_ptr<Archive>> Archive::create(MemoryBufferRef Source) { 
+  Error Err = Error::success(); 
+  std::unique_ptr<Archive> Ret(new Archive(Source, Err)); 
+  if (Err) 
+    return std::move(Err); 
+  return std::move(Ret); 
+} 
+ 
+void Archive::setFirstRegular(const Child &C) { 
+  FirstRegularData = C.Data; 
+  FirstRegularStartOfFile = C.StartOfFile; 
+} 
+ 
+Archive::Archive(MemoryBufferRef Source, Error &Err) 
+    : Binary(Binary::ID_Archive, Source) { 
+  ErrorAsOutParameter ErrAsOutParam(&Err); 
+  StringRef Buffer = Data.getBuffer(); 
+  // Check for sufficient magic. 
+  if (Buffer.startswith(ThinMagic)) { 
+    IsThin = true; 
+  } else if (Buffer.startswith(Magic)) { 
+    IsThin = false; 
+  } else { 
+    Err = make_error<GenericBinaryError>("file too small to be an archive", 
+                                         object_error::invalid_file_type); 
+    return; 
+  } 
+ 
+  // Make sure Format is initialized before any call to 
+  // ArchiveMemberHeader::getName() is made.  This could be a valid empty 
+  // archive which is the same in all formats.  So claiming it to be gnu to is 
+  // fine if not totally correct before we look for a string table or table of 
+  // contents. 
+  Format = K_GNU; 
+ 
+  // Get the special members. 
+  child_iterator I = child_begin(Err, false); 
+  if (Err) 
+    return; 
+  child_iterator E = child_end(); 
+ 
+  // See if this is a valid empty archive and if so return. 
+  if (I == E) { 
+    Err = Error::success(); 
+    return; 
+  } 
+  const Child *C = &*I; 
+ 
+  auto Increment = [&]() { 
+    ++I; 
+    if (Err) 
+      return true; 
+    C = &*I; 
+    return false; 
+  }; 
+ 
+  Expected<StringRef> NameOrErr = C->getRawName(); 
+  if (!NameOrErr) { 
+    Err = NameOrErr.takeError(); 
+    return; 
+  } 
+  StringRef Name = NameOrErr.get(); 
+ 
+  // Below is the pattern that is used to figure out the archive format 
+  // GNU archive format 
+  //  First member : / (may exist, if it exists, points to the symbol table ) 
+  //  Second member : // (may exist, if it exists, points to the string table) 
+  //  Note : The string table is used if the filename exceeds 15 characters 
+  // BSD archive format 
+  //  First member : __.SYMDEF or "__.SYMDEF SORTED" (the symbol table) 
+  //  There is no string table, if the filename exceeds 15 characters or has a 
+  //  embedded space, the filename has #1/<size>, The size represents the size 
+  //  of the filename that needs to be read after the archive header 
+  // COFF archive format 
+  //  First member : / 
+  //  Second member : / (provides a directory of symbols) 
+  //  Third member : // (may exist, if it exists, contains the string table) 
+  //  Note: Microsoft PE/COFF Spec 8.3 says that the third member is present 
+  //  even if the string table is empty. However, lib.exe does not in fact 
+  //  seem to create the third member if there's no member whose filename 
+  //  exceeds 15 characters. So the third member is optional. 
+ 
+  if (Name == "__.SYMDEF" || Name == "__.SYMDEF_64") { 
+    if (Name == "__.SYMDEF") 
+      Format = K_BSD; 
+    else // Name == "__.SYMDEF_64" 
+      Format = K_DARWIN64; 
+    // We know that the symbol table is not an external file, but we still must 
+    // check any Expected<> return value. 
+    Expected<StringRef> BufOrErr = C->getBuffer(); 
+    if (!BufOrErr) { 
+      Err = BufOrErr.takeError(); 
+      return; 
+    } 
+    SymbolTable = BufOrErr.get(); 
+    if (Increment()) 
+      return; 
+    setFirstRegular(*C); 
+ 
+    Err = Error::success(); 
+    return; 
+  } 
+ 
+  if (Name.startswith("#1/")) { 
+    Format = K_BSD; 
+    // We know this is BSD, so getName will work since there is no string table. 
+    Expected<StringRef> NameOrErr = C->getName(); 
+    if (!NameOrErr) { 
+      Err = NameOrErr.takeError(); 
+      return; 
+    } 
+    Name = NameOrErr.get(); 
+    if (Name == "__.SYMDEF SORTED" || Name == "__.SYMDEF") { 
+      // We know that the symbol table is not an external file, but we still 
+      // must check any Expected<> return value. 
+      Expected<StringRef> BufOrErr = C->getBuffer(); 
+      if (!BufOrErr) { 
+        Err = BufOrErr.takeError(); 
+        return; 
+      } 
+      SymbolTable = BufOrErr.get(); 
+      if (Increment()) 
+        return; 
+    } 
+    else if (Name == "__.SYMDEF_64 SORTED" || Name == "__.SYMDEF_64") { 
+      Format = K_DARWIN64; 
+      // We know that the symbol table is not an external file, but we still 
+      // must check any Expected<> return value. 
+      Expected<StringRef> BufOrErr = C->getBuffer(); 
+      if (!BufOrErr) { 
+        Err = BufOrErr.takeError(); 
+        return; 
+      } 
+      SymbolTable = BufOrErr.get(); 
+      if (Increment()) 
+        return; 
+    } 
+    setFirstRegular(*C); 
+    return; 
+  } 
+ 
+  // MIPS 64-bit ELF archives use a special format of a symbol table. 
+  // This format is marked by `ar_name` field equals to "/SYM64/". 
+  // For detailed description see page 96 in the following document: 
+  // http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf 
+ 
+  bool has64SymTable = false; 
+  if (Name == "/" || Name == "/SYM64/") { 
+    // We know that the symbol table is not an external file, but we still 
+    // must check any Expected<> return value. 
+    Expected<StringRef> BufOrErr = C->getBuffer(); 
+    if (!BufOrErr) { 
+      Err = BufOrErr.takeError(); 
+      return; 
+    } 
+    SymbolTable = BufOrErr.get(); 
+    if (Name == "/SYM64/") 
+      has64SymTable = true; 
+ 
+    if (Increment()) 
+      return; 
+    if (I == E) { 
+      Err = Error::success(); 
+      return; 
+    } 
+    Expected<StringRef> NameOrErr = C->getRawName(); 
+    if (!NameOrErr) { 
+      Err = NameOrErr.takeError(); 
+      return; 
+    } 
+    Name = NameOrErr.get(); 
+  } 
+ 
+  if (Name == "//") { 
+    Format = has64SymTable ? K_GNU64 : K_GNU; 
+    // The string table is never an external member, but we still 
+    // must check any Expected<> return value. 
+    Expected<StringRef> BufOrErr = C->getBuffer(); 
+    if (!BufOrErr) { 
+      Err = BufOrErr.takeError(); 
+      return; 
+    } 
+    StringTable = BufOrErr.get(); 
+    if (Increment()) 
+      return; 
+    setFirstRegular(*C); 
+    Err = Error::success(); 
+    return; 
+  } 
+ 
+  if (Name[0] != '/') { 
+    Format = has64SymTable ? K_GNU64 : K_GNU; 
+    setFirstRegular(*C); 
+    Err = Error::success(); 
+    return; 
+  } 
+ 
+  if (Name != "/") { 
+    Err = errorCodeToError(object_error::parse_failed); 
+    return; 
+  } 
+ 
+  Format = K_COFF; 
+  // We know that the symbol table is not an external file, but we still 
+  // must check any Expected<> return value. 
+  Expected<StringRef> BufOrErr = C->getBuffer(); 
+  if (!BufOrErr) { 
+    Err = BufOrErr.takeError(); 
+    return; 
+  } 
+  SymbolTable = BufOrErr.get(); 
+ 
+  if (Increment()) 
+    return; 
+ 
+  if (I == E) { 
+    setFirstRegular(*C); 
+    Err = Error::success(); 
+    return; 
+  } 
+ 
+  NameOrErr = C->getRawName(); 
+  if (!NameOrErr) { 
+    Err = NameOrErr.takeError(); 
+    return; 
+  } 
+  Name = NameOrErr.get(); 
+ 
+  if (Name == "//") { 
+    // The string table is never an external member, but we still 
+    // must check any Expected<> return value. 
+    Expected<StringRef> BufOrErr = C->getBuffer(); 
+    if (!BufOrErr) { 
+      Err = BufOrErr.takeError(); 
+      return; 
+    } 
+    StringTable = BufOrErr.get(); 
+    if (Increment()) 
+      return; 
+  } 
+ 
+  setFirstRegular(*C); 
+  Err = Error::success(); 
+} 
+ 
+Archive::child_iterator Archive::child_begin(Error &Err, 
+                                             bool SkipInternal) const { 
+  if (isEmpty()) 
+    return child_end(); 
+ 
+  if (SkipInternal) 
+    return child_iterator::itr( 
+        Child(this, FirstRegularData, FirstRegularStartOfFile), Err); 
+ 
+  const char *Loc = Data.getBufferStart() + strlen(Magic); 
+  Child C(this, Loc, &Err); 
+  if (Err) 
+    return child_end(); 
+  return child_iterator::itr(C, Err); 
+} 
+ 
+Archive::child_iterator Archive::child_end() const { 
+  return child_iterator::end(Child(nullptr, nullptr, nullptr)); 
+} 
+ 
+StringRef Archive::Symbol::getName() const { 
+  return Parent->getSymbolTable().begin() + StringIndex; 
+} 
+ 
+Expected<Archive::Child> Archive::Symbol::getMember() const { 
+  const char *Buf = Parent->getSymbolTable().begin(); 
+  const char *Offsets = Buf; 
+  if (Parent->kind() == K_GNU64 || Parent->kind() == K_DARWIN64) 
+    Offsets += sizeof(uint64_t); 
+  else 
+    Offsets += sizeof(uint32_t); 
+  uint64_t Offset = 0; 
+  if (Parent->kind() == K_GNU) { 
+    Offset = read32be(Offsets + SymbolIndex * 4); 
+  } else if (Parent->kind() == K_GNU64) { 
+    Offset = read64be(Offsets + SymbolIndex * 8); 
+  } else if (Parent->kind() == K_BSD) { 
+    // The SymbolIndex is an index into the ranlib structs that start at 
+    // Offsets (the first uint32_t is the number of bytes of the ranlib 
+    // structs).  The ranlib structs are a pair of uint32_t's the first 
+    // being a string table offset and the second being the offset into 
+    // the archive of the member that defines the symbol.  Which is what 
+    // is needed here. 
+    Offset = read32le(Offsets + SymbolIndex * 8 + 4); 
+  } else if (Parent->kind() == K_DARWIN64) { 
+    // The SymbolIndex is an index into the ranlib_64 structs that start at 
+    // Offsets (the first uint64_t is the number of bytes of the ranlib_64 
+    // structs).  The ranlib_64 structs are a pair of uint64_t's the first 
+    // being a string table offset and the second being the offset into 
+    // the archive of the member that defines the symbol.  Which is what 
+    // is needed here. 
+    Offset = read64le(Offsets + SymbolIndex * 16 + 8); 
+  } else { 
+    // Skip offsets. 
+    uint32_t MemberCount = read32le(Buf); 
+    Buf += MemberCount * 4 + 4; 
+ 
+    uint32_t SymbolCount = read32le(Buf); 
+    if (SymbolIndex >= SymbolCount) 
+      return errorCodeToError(object_error::parse_failed); 
+ 
+    // Skip SymbolCount to get to the indices table. 
+    const char *Indices = Buf + 4; 
+ 
+    // Get the index of the offset in the file member offset table for this 
+    // symbol. 
+    uint16_t OffsetIndex = read16le(Indices + SymbolIndex * 2); 
+    // Subtract 1 since OffsetIndex is 1 based. 
+    --OffsetIndex; 
+ 
+    if (OffsetIndex >= MemberCount) 
+      return errorCodeToError(object_error::parse_failed); 
+ 
+    Offset = read32le(Offsets + OffsetIndex * 4); 
+  } 
+ 
+  const char *Loc = Parent->getData().begin() + Offset; 
+  Error Err = Error::success(); 
+  Child C(Parent, Loc, &Err); 
+  if (Err) 
+    return std::move(Err); 
+  return C; 
+} 
+ 
+Archive::Symbol Archive::Symbol::getNext() const { 
+  Symbol t(*this); 
+  if (Parent->kind() == K_BSD) { 
+    // t.StringIndex is an offset from the start of the __.SYMDEF or 
+    // "__.SYMDEF SORTED" member into the string table for the ranlib 
+    // struct indexed by t.SymbolIndex .  To change t.StringIndex to the 
+    // offset in the string table for t.SymbolIndex+1 we subtract the 
+    // its offset from the start of the string table for t.SymbolIndex 
+    // and add the offset of the string table for t.SymbolIndex+1. 
+ 
+    // The __.SYMDEF or "__.SYMDEF SORTED" member starts with a uint32_t 
+    // which is the number of bytes of ranlib structs that follow.  The ranlib 
+    // structs are a pair of uint32_t's the first being a string table offset 
+    // and the second being the offset into the archive of the member that 
+    // define the symbol. After that the next uint32_t is the byte count of 
+    // the string table followed by the string table. 
+    const char *Buf = Parent->getSymbolTable().begin(); 
+    uint32_t RanlibCount = 0; 
+    RanlibCount = read32le(Buf) / 8; 
+    // If t.SymbolIndex + 1 will be past the count of symbols (the RanlibCount) 
+    // don't change the t.StringIndex as we don't want to reference a ranlib 
+    // past RanlibCount. 
+    if (t.SymbolIndex + 1 < RanlibCount) { 
+      const char *Ranlibs = Buf + 4; 
+      uint32_t CurRanStrx = 0; 
+      uint32_t NextRanStrx = 0; 
+      CurRanStrx = read32le(Ranlibs + t.SymbolIndex * 8); 
+      NextRanStrx = read32le(Ranlibs + (t.SymbolIndex + 1) * 8); 
+      t.StringIndex -= CurRanStrx; 
+      t.StringIndex += NextRanStrx; 
+    } 
+  } else { 
+    // Go to one past next null. 
+    t.StringIndex = Parent->getSymbolTable().find('\0', t.StringIndex) + 1; 
+  } 
+  ++t.SymbolIndex; 
+  return t; 
+} 
+ 
+Archive::symbol_iterator Archive::symbol_begin() const { 
+  if (!hasSymbolTable()) 
+    return symbol_iterator(Symbol(this, 0, 0)); 
+ 
+  const char *buf = getSymbolTable().begin(); 
+  if (kind() == K_GNU) { 
+    uint32_t symbol_count = 0; 
+    symbol_count = read32be(buf); 
+    buf += sizeof(uint32_t) + (symbol_count * (sizeof(uint32_t))); 
+  } else if (kind() == K_GNU64) { 
+    uint64_t symbol_count = read64be(buf); 
+    buf += sizeof(uint64_t) + (symbol_count * (sizeof(uint64_t))); 
+  } else if (kind() == K_BSD) { 
+    // The __.SYMDEF or "__.SYMDEF SORTED" member starts with a uint32_t 
+    // which is the number of bytes of ranlib structs that follow.  The ranlib 
+    // structs are a pair of uint32_t's the first being a string table offset 
+    // and the second being the offset into the archive of the member that 
+    // define the symbol. After that the next uint32_t is the byte count of 
+    // the string table followed by the string table. 
+    uint32_t ranlib_count = 0; 
+    ranlib_count = read32le(buf) / 8; 
+    const char *ranlibs = buf + 4; 
+    uint32_t ran_strx = 0; 
+    ran_strx = read32le(ranlibs); 
+    buf += sizeof(uint32_t) + (ranlib_count * (2 * (sizeof(uint32_t)))); 
+    // Skip the byte count of the string table. 
+    buf += sizeof(uint32_t); 
+    buf += ran_strx; 
+  } else if (kind() == K_DARWIN64) { 
+    // The __.SYMDEF_64 or "__.SYMDEF_64 SORTED" member starts with a uint64_t 
+    // which is the number of bytes of ranlib_64 structs that follow.  The 
+    // ranlib_64 structs are a pair of uint64_t's the first being a string 
+    // table offset and the second being the offset into the archive of the 
+    // member that define the symbol. After that the next uint64_t is the byte 
+    // count of the string table followed by the string table. 
+    uint64_t ranlib_count = 0; 
+    ranlib_count = read64le(buf) / 16; 
+    const char *ranlibs = buf + 8; 
+    uint64_t ran_strx = 0; 
+    ran_strx = read64le(ranlibs); 
+    buf += sizeof(uint64_t) + (ranlib_count * (2 * (sizeof(uint64_t)))); 
+    // Skip the byte count of the string table. 
+    buf += sizeof(uint64_t); 
+    buf += ran_strx; 
+  } else { 
+    uint32_t member_count = 0; 
+    uint32_t symbol_count = 0; 
+    member_count = read32le(buf); 
+    buf += 4 + (member_count * 4); // Skip offsets. 
+    symbol_count = read32le(buf); 
+    buf += 4 + (symbol_count * 2); // Skip indices. 
+  } 
+  uint32_t string_start_offset = buf - getSymbolTable().begin(); 
+  return symbol_iterator(Symbol(this, 0, string_start_offset)); 
+} 
+ 
+Archive::symbol_iterator Archive::symbol_end() const { 
+  return symbol_iterator(Symbol(this, getNumberOfSymbols(), 0)); 
+} 
+ 
+uint32_t Archive::getNumberOfSymbols() const { 
+  if (!hasSymbolTable()) 
+    return 0; 
+  const char *buf = getSymbolTable().begin(); 
+  if (kind() == K_GNU) 
+    return read32be(buf); 
+  if (kind() == K_GNU64) 
+    return read64be(buf); 
+  if (kind() == K_BSD) 
+    return read32le(buf) / 8; 
+  if (kind() == K_DARWIN64) 
+    return read64le(buf) / 16; 
+  uint32_t member_count = 0; 
+  member_count = read32le(buf); 
+  buf += 4 + (member_count * 4); // Skip offsets. 
+  return read32le(buf); 
+} 
+ 
+Expected<Optional<Archive::Child>> Archive::findSym(StringRef name) const { 
+  Archive::symbol_iterator bs = symbol_begin(); 
+  Archive::symbol_iterator es = symbol_end(); 
+ 
+  for (; bs != es; ++bs) { 
+    StringRef SymName = bs->getName(); 
+    if (SymName == name) { 
+      if (auto MemberOrErr = bs->getMember()) 
+        return Child(*MemberOrErr); 
+      else 
+        return MemberOrErr.takeError(); 
+    } 
+  } 
+  return Optional<Child>(); 
+} 
+ 
+// Returns true if archive file contains no member file. 
+bool Archive::isEmpty() const { return Data.getBufferSize() == 8; } 
+ 
+bool Archive::hasSymbolTable() const { return !SymbolTable.empty(); }