[llvm-ar] Strip trailing \r and format

Reviewers: mstorsjo, rupprecht, gbreynoo

Reviewed By: rupprecht

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D53769

llvm-svn: 345410

1 files changed, 1046 insertions, 1018 deletions

diff --git a/llvm/tools/llvm-ar/llvm-ar.cpp b/llvm/tools/llvm-ar/llvm-ar.cpp
index 2c6dc8fad92..5ab8ae13d3e 100644
--- a/llvm/tools/llvm-ar/llvm-ar.cpp
+++ b/llvm/tools/llvm-ar/llvm-ar.cpp
@@ -1,1018 +1,1046 @@
-//===-- llvm-ar.cpp - LLVM archive librarian utility ----------------------===//

-//

-//                     The LLVM Compiler Infrastructure

-//

-// This file is distributed under the University of Illinois Open Source

-// License. See LICENSE.TXT for details.

-//

-//===----------------------------------------------------------------------===//

-//

-// Builds up (relatively) standard unix archive files (.a) containing LLVM

-// bitcode or other files.

-//

-//===----------------------------------------------------------------------===//

-

-#include "llvm/ADT/StringSwitch.h"

-#include "llvm/ADT/Triple.h"

-#include "llvm/IR/LLVMContext.h"

-#include "llvm/Object/Archive.h"

-#include "llvm/Object/ArchiveWriter.h"

-#include "llvm/Object/MachO.h"

-#include "llvm/Object/ObjectFile.h"

-#include "llvm/Support/Chrono.h"

-#include "llvm/Support/CommandLine.h"

-#include "llvm/Support/Errc.h"

-#include "llvm/Support/FileSystem.h"

-#include "llvm/Support/Format.h"

-#include "llvm/Support/FormatVariadic.h"

-#include "llvm/Support/InitLLVM.h"

-#include "llvm/Support/LineIterator.h"

-#include "llvm/Support/MemoryBuffer.h"

-#include "llvm/Support/Path.h"

-#include "llvm/Support/Process.h"

-#include "llvm/Support/StringSaver.h"

-#include "llvm/Support/TargetSelect.h"

-#include "llvm/Support/ToolOutputFile.h"

-#include "llvm/Support/raw_ostream.h"

-#include "llvm/ToolDrivers/llvm-dlltool/DlltoolDriver.h"

-#include "llvm/ToolDrivers/llvm-lib/LibDriver.h"

-

-#if !defined(_MSC_VER) && !defined(__MINGW32__)

-#include <unistd.h>

-#else

-#include <io.h>

-#endif

-

-using namespace llvm;

-

-// The name this program was invoked as.

-static StringRef ToolName;

-

-// The basename of this program.

-static StringRef Stem;

-

-const char RanlibHelp[] = R"(

-OVERVIEW: LLVM Ranlib (llvm-ranlib)

-

-  This program generates an index to speed access to archives

-

-USAGE: llvm-ranlib <archive-file>

-

-OPTIONS:

-  -help                             - Display available options

-  -version                          - Display the version of this program

-)";

-

-const char ArHelp[] = R"(

-OVERVIEW: LLVM Archiver

-

-USAGE: llvm-ar [options] [-]<operation>[modifiers] [relpos] <archive> [files]

-       llvm-ar -M [<mri-script]

-

-OPTIONS:

-  --format              - Archive format to create

-    =default            -   default

-    =gnu                -   gnu

-    =darwin             -   darwin

-    =bsd                -   bsd

-  --plugin=<string>     - Ignored for compatibility

-  --help                - Display available options

-  --version             - Display the version of this program

-

-OPERATIONS:

-  d - delete [files] from the archive

-  m - move [files] in the archive

-  p - print [files] found in the archive

-  q - quick append [files] to the archive

-  r - replace or insert [files] into the archive

-  s - act as ranlib

-  t - display contents of archive

-  x - extract [files] from the archive

-

-MODIFIERS:

-  [a] - put [files] after [relpos]

-  [b] - put [files] before [relpos] (same as [i])

-  [c] - do not warn if archive had to be created

-  [D] - use zero for timestamps and uids/gids (default)

-  [i] - put [files] before [relpos] (same as [b])

-  [l] - ignored for compatibility

-  [L] - add archive's contents

-  [o] - preserve original dates

-  [s] - create an archive index (cf. ranlib)

-  [S] - do not build a symbol table

-  [T] - create a thin archive

-  [u] - update only [files] newer than archive contents

-  [U] - use actual timestamps and uids/gids

-  [v] - be verbose about actions taken

-)";

-

-void printHelpMessage() {

-  if (Stem.contains_lower("ranlib"))

-    outs() << RanlibHelp;

-  else if (Stem.contains_lower("ar"))

-    outs() << ArHelp;

-}

-

-// Show the error message and exit.

-LLVM_ATTRIBUTE_NORETURN static void fail(Twine Error) {

-  errs() << ToolName << ": " << Error << ".\n";

-  printHelpMessage();

-  exit(1);

-}

-

-static void failIfError(std::error_code EC, Twine Context = "") {

-  if (!EC)

-    return;

-

-  std::string ContextStr = Context.str();

-  if (ContextStr == "")

-    fail(EC.message());

-  fail(Context + ": " + EC.message());

-}

-

-static void failIfError(Error E, Twine Context = "") {

-  if (!E)

-    return;

-

-  handleAllErrors(std::move(E), [&](const llvm::ErrorInfoBase &EIB) {

-    std::string ContextStr = Context.str();

-    if (ContextStr == "")

-      fail(EIB.message());

-    fail(Context + ": " + EIB.message());

-  });

-}

-

-static SmallVector<const char *, 256> PositionalArgs;

-

-static bool MRI;

-

-namespace {

-enum Format { Default, GNU, BSD, DARWIN, Unknown };

-}

-

-static Format FormatType = Default;

-

-static std::string Options;

-

-// This enumeration delineates the kinds of operations on an archive

-// that are permitted.

-enum ArchiveOperation {

-  Print,            ///< Print the contents of the archive

-  Delete,           ///< Delete the specified members

-  Move,             ///< Move members to end or as given by {a,b,i} modifiers

-  QuickAppend,      ///< Quickly append to end of archive

-  ReplaceOrInsert,  ///< Replace or Insert members

-  DisplayTable,     ///< Display the table of contents

-  Extract,          ///< Extract files back to file system

-  CreateSymTab      ///< Create a symbol table in an existing archive

-};

-

-// Modifiers to follow operation to vary behavior

-static bool AddAfter = false;      ///< 'a' modifier

-static bool AddBefore = false;     ///< 'b' modifier

-static bool Create = false;        ///< 'c' modifier

-static bool OriginalDates = false; ///< 'o' modifier

-static bool OnlyUpdate = false;    ///< 'u' modifier

-static bool Verbose = false;       ///< 'v' modifier

-static bool Symtab = true;         ///< 's' modifier

-static bool Deterministic = true;  ///< 'D' and 'U' modifiers

-static bool Thin = false;          ///< 'T' modifier

-static bool AddLibrary = false;    ///< 'L' modifier

-

-// Relative Positional Argument (for insert/move). This variable holds

-// the name of the archive member to which the 'a', 'b' or 'i' modifier

-// refers. Only one of 'a', 'b' or 'i' can be specified so we only need

-// one variable.

-static std::string RelPos;

-

-// This variable holds the name of the archive file as given on the

-// command line.

-static std::string ArchiveName;

-

-// This variable holds the list of member files to proecess, as given

-// on the command line.

-static std::vector<StringRef> Members;

-

-// Extract the member filename from the command line for the [relpos] argument

-// associated with a, b, and i modifiers

-static void getRelPos() {

-  if (PositionalArgs.size() == 0)

-    fail("Expected [relpos] for a, b, or i modifier");

-  RelPos = PositionalArgs[0];

-  PositionalArgs.erase(PositionalArgs.begin());

-}

-

-// Get the archive file name from the command line

-static void getArchive() {

-  if (PositionalArgs.size() == 0)

-    fail("An archive name must be specified");

-  ArchiveName = PositionalArgs[0];

-  PositionalArgs.erase(PositionalArgs.begin());

-}

-

-// Copy over remaining items in PositionalArgs to our Members vector

-static void getMembers() {

-  for (auto &Arg : PositionalArgs)

-    Members.push_back(Arg);

-}

-

-std::vector<std::unique_ptr<MemoryBuffer>> ArchiveBuffers;

-std::vector<std::unique_ptr<object::Archive>> Archives;

-

-static object::Archive &readLibrary(const Twine &Library) {

-  auto BufOrErr = MemoryBuffer::getFile(Library, -1, false);

-  failIfError(BufOrErr.getError(), "Could not open library");

-  ArchiveBuffers.push_back(std::move(*BufOrErr));

-  auto LibOrErr =

-      object::Archive::create(ArchiveBuffers.back()->getMemBufferRef());

-  failIfError(errorToErrorCode(LibOrErr.takeError()),

-              "Could not parse library");

-  Archives.push_back(std::move(*LibOrErr));

-  return *Archives.back();

-}

-

-static void runMRIScript();

-

-// Parse the command line options as presented and return the operation

-// specified. Process all modifiers and check to make sure that constraints on

-// modifier/operation pairs have not been violated.

-static ArchiveOperation parseCommandLine() {

-  if (MRI) {

-    if (!PositionalArgs.empty() || !Options.empty())

-      fail("Cannot mix -M and other options");

-    runMRIScript();

-  }

-

-  // Keep track of number of operations. We can only specify one

-  // per execution.

-  unsigned NumOperations = 0;

-

-  // Keep track of the number of positional modifiers (a,b,i). Only

-  // one can be specified.

-  unsigned NumPositional = 0;

-

-  // Keep track of which operation was requested

-  ArchiveOperation Operation;

-

-  bool MaybeJustCreateSymTab = false;

-

-  for(unsigned i=0; i<Options.size(); ++i) {

-    switch(Options[i]) {

-    case 'd': ++NumOperations; Operation = Delete; break;

-    case 'm': ++NumOperations; Operation = Move ; break;

-    case 'p': ++NumOperations; Operation = Print; break;

-    case 'q': ++NumOperations; Operation = QuickAppend; break;

-    case 'r': ++NumOperations; Operation = ReplaceOrInsert; break;

-    case 't': ++NumOperations; Operation = DisplayTable; break;

-    case 'x': ++NumOperations; Operation = Extract; break;

-    case 'c': Create = true; break;

-    case 'l': /* accepted but unused */ break;

-    case 'o': OriginalDates = true; break;

-    case 's':

-      Symtab = true;

-      MaybeJustCreateSymTab = true;

-      break;

-    case 'S':

-      Symtab = false;

-      break;

-    case 'u': OnlyUpdate = true; break;

-    case 'v': Verbose = true; break;

-    case 'a':

-      getRelPos();

-      AddAfter = true;

-      NumPositional++;

-      break;

-    case 'b':

-      getRelPos();

-      AddBefore = true;

-      NumPositional++;

-      break;

-    case 'i':

-      getRelPos();

-      AddBefore = true;

-      NumPositional++;

-      break;

-    case 'D':

-      Deterministic = true;

-      break;

-    case 'U':

-      Deterministic = false;

-      break;

-    case 'T':

-      Thin = true;

-      break;

-    case 'L':

-      AddLibrary = true;

-      break;

-    default:

-      fail(std::string("unknown option ") + Options[i]);

-    }

-  }

-

-  // At this point, the next thing on the command line must be

-  // the archive name.

-  getArchive();

-

-  // Everything on the command line at this point is a member.

-  getMembers();

-

- if (NumOperations == 0 && MaybeJustCreateSymTab) {

-    NumOperations = 1;

-    Operation = CreateSymTab;

-    if (!Members.empty())

-      fail("The s operation takes only an archive as argument");

-  }

-

-  // Perform various checks on the operation/modifier specification

-  // to make sure we are dealing with a legal request.

-  if (NumOperations == 0)

-    fail("You must specify at least one of the operations");

-  if (NumOperations > 1)

-    fail("Only one operation may be specified");

-  if (NumPositional > 1)

-    fail("You may only specify one of a, b, and i modifiers");

-  if (AddAfter || AddBefore) {

-    if (Operation != Move && Operation != ReplaceOrInsert)

-      fail("The 'a', 'b' and 'i' modifiers can only be specified with "

-           "the 'm' or 'r' operations");

-  }

-  if (OriginalDates && Operation != Extract)

-    fail("The 'o' modifier is only applicable to the 'x' operation");

-  if (OnlyUpdate && Operation != ReplaceOrInsert)

-    fail("The 'u' modifier is only applicable to the 'r' operation");

-  if (AddLibrary && Operation != QuickAppend)

-    fail("The 'L' modifier is only applicable to the 'q' operation");

-

-  // Return the parsed operation to the caller

-  return Operation;

-}

-

-// Implements the 'p' operation. This function traverses the archive

-// looking for members that match the path list.

-static void doPrint(StringRef Name, const object::Archive::Child &C) {

-  if (Verbose)

-    outs() << "Printing " << Name << "\n";

-

-  Expected<StringRef> DataOrErr = C.getBuffer();

-  failIfError(DataOrErr.takeError());

-  StringRef Data = *DataOrErr;

-  outs().write(Data.data(), Data.size());

-}

-

-// Utility function for printing out the file mode when the 't' operation is in

-// verbose mode.

-static void printMode(unsigned mode) {

-  outs() << ((mode & 004) ? "r" : "-");

-  outs() << ((mode & 002) ? "w" : "-");

-  outs() << ((mode & 001) ? "x" : "-");

-}

-

-// Implement the 't' operation. This function prints out just

-// the file names of each of the members. However, if verbose mode is requested

-// ('v' modifier) then the file type, permission mode, user, group, size, and

-// modification time are also printed.

-static void doDisplayTable(StringRef Name, const object::Archive::Child &C) {

-  if (Verbose) {

-    Expected<sys::fs::perms> ModeOrErr = C.getAccessMode();

-    failIfError(ModeOrErr.takeError());

-    sys::fs::perms Mode = ModeOrErr.get();

-    printMode((Mode >> 6) & 007);

-    printMode((Mode >> 3) & 007);

-    printMode(Mode & 007);

-    Expected<unsigned> UIDOrErr = C.getUID();

-    failIfError(UIDOrErr.takeError());

-    outs() << ' ' << UIDOrErr.get();

-    Expected<unsigned> GIDOrErr = C.getGID();

-    failIfError(GIDOrErr.takeError());

-    outs() << '/' << GIDOrErr.get();

-    Expected<uint64_t> Size = C.getSize();

-    failIfError(Size.takeError());

-    outs() << ' ' << format("%6llu", Size.get());

-    auto ModTimeOrErr = C.getLastModified();

-    failIfError(ModTimeOrErr.takeError());

-    // Note: formatv() only handles the default TimePoint<>, which is in

-    // nanoseconds.

-    // TODO: fix format_provider<TimePoint<>> to allow other units.

-    sys::TimePoint<> ModTimeInNs = ModTimeOrErr.get();

-    outs() << ' ' << formatv("{0:%b %e %H:%M %Y}", ModTimeInNs);

-    outs() << ' ';

-  }

-

-  if (C.getParent()->isThin()) {

-    outs() << sys::path::parent_path(ArchiveName);

-    outs() << '/';

-  }

-  outs() << Name << "\n";

-}

-

-// Implement the 'x' operation. This function extracts files back to the file

-// system.

-static void doExtract(StringRef Name, const object::Archive::Child &C) {

-  // Retain the original mode.

-  Expected<sys::fs::perms> ModeOrErr = C.getAccessMode();

-  failIfError(ModeOrErr.takeError());

-  sys::fs::perms Mode = ModeOrErr.get();

-

-  int FD;

-  failIfError(sys::fs::openFileForWrite(sys::path::filename(Name), FD,

-                                        sys::fs::CD_CreateAlways,

-                                        sys::fs::F_None, Mode),

-              Name);

-

-  {

-    raw_fd_ostream file(FD, false);

-

-    // Get the data and its length

-    Expected<StringRef> BufOrErr = C.getBuffer();

-    failIfError(BufOrErr.takeError());

-    StringRef Data = BufOrErr.get();

-

-    // Write the data.

-    file.write(Data.data(), Data.size());

-  }

-

-  // If we're supposed to retain the original modification times, etc. do so

-  // now.

-  if (OriginalDates) {

-    auto ModTimeOrErr = C.getLastModified();

-    failIfError(ModTimeOrErr.takeError());

-    failIfError(

-        sys::fs::setLastAccessAndModificationTime(FD, ModTimeOrErr.get()));

-  }

-

-  if (close(FD))

-    fail("Could not close the file");

-}

-

-static bool shouldCreateArchive(ArchiveOperation Op) {

-  switch (Op) {

-  case Print:

-  case Delete:

-  case Move:

-  case DisplayTable:

-  case Extract:

-  case CreateSymTab:

-    return false;

-

-  case QuickAppend:

-  case ReplaceOrInsert:

-    return true;

-  }

-

-  llvm_unreachable("Missing entry in covered switch.");

-}

-

-static void performReadOperation(ArchiveOperation Operation,

-                                 object::Archive *OldArchive) {

-  if (Operation == Extract && OldArchive->isThin())

-    fail("extracting from a thin archive is not supported");

-

-  bool Filter = !Members.empty();

-  {

-    Error Err = Error::success();

-    for (auto &C : OldArchive->children(Err)) {

-      Expected<StringRef> NameOrErr = C.getName();

-      failIfError(NameOrErr.takeError());

-      StringRef Name = NameOrErr.get();

-

-      if (Filter) {

-        auto I = find(Members, Name);

-        if (I == Members.end())

-          continue;

-        Members.erase(I);

-      }

-

-      switch (Operation) {

-      default:

-        llvm_unreachable("Not a read operation");

-      case Print:

-        doPrint(Name, C);

-        break;

-      case DisplayTable:

-        doDisplayTable(Name, C);

-        break;

-      case Extract:

-        doExtract(Name, C);

-        break;

-      }

-    }

-    failIfError(std::move(Err));

-  }

-

-  if (Members.empty())

-    return;

-  for (StringRef Name : Members)

-    errs() << Name << " was not found\n";

-  exit(1);

-}

-

-static void addMember(std::vector<NewArchiveMember> &Members,

-                      StringRef FileName, int Pos = -1) {

-  Expected<NewArchiveMember> NMOrErr =

-      NewArchiveMember::getFile(FileName, Deterministic);

-  failIfError(NMOrErr.takeError(), FileName);

-

-  // Use the basename of the object path for the member name.

-  NMOrErr->MemberName = sys::path::filename(NMOrErr->MemberName);

-

-  if (Pos == -1)

-    Members.push_back(std::move(*NMOrErr));

-  else

-    Members[Pos] = std::move(*NMOrErr);

-}

-

-static void addMember(std::vector<NewArchiveMember> &Members,

-                      const object::Archive::Child &M, int Pos = -1) {

-  if (Thin && !M.getParent()->isThin())

-    fail("Cannot convert a regular archive to a thin one");

-  Expected<NewArchiveMember> NMOrErr =

-      NewArchiveMember::getOldMember(M, Deterministic);

-  failIfError(NMOrErr.takeError());

-  if (Pos == -1)

-    Members.push_back(std::move(*NMOrErr));

-  else

-    Members[Pos] = std::move(*NMOrErr);

-}

-

-static void addLibMember(std::vector<NewArchiveMember> &Members,

-                         StringRef FileName) {

-  Expected<NewArchiveMember> NMOrErr =

-      NewArchiveMember::getFile(FileName, Deterministic);

-  failIfError(NMOrErr.takeError(), FileName);

-  if (identify_magic(NMOrErr->Buf->getBuffer()) == file_magic::archive) {

-    object::Archive &Lib = readLibrary(FileName);

-    Error Err = Error::success();

-

-    for (auto &Child : Lib.children(Err))

-      addMember(Members, Child);

-

-    failIfError(std::move(Err));

-  } else {

-    // Use the basename of the object path for the member name.

-    NMOrErr->MemberName = sys::path::filename(NMOrErr->MemberName);

-    Members.push_back(std::move(*NMOrErr));

-  }

-}

-

-enum InsertAction {

-  IA_AddOldMember,

-  IA_AddNewMember,

-  IA_Delete,

-  IA_MoveOldMember,

-  IA_MoveNewMember

-};

-

-static InsertAction computeInsertAction(ArchiveOperation Operation,

-                                        const object::Archive::Child &Member,

-                                        StringRef Name,

-                                        std::vector<StringRef>::iterator &Pos) {

-  if (Operation == QuickAppend || Members.empty())

-    return IA_AddOldMember;

-

-  auto MI = find_if(Members, [Name](StringRef Path) {

-    return Name == sys::path::filename(Path);

-  });

-

-  if (MI == Members.end())

-    return IA_AddOldMember;

-

-  Pos = MI;

-

-  if (Operation == Delete)

-    return IA_Delete;

-

-  if (Operation == Move)

-    return IA_MoveOldMember;

-

-  if (Operation == ReplaceOrInsert) {

-    StringRef PosName = sys::path::filename(RelPos);

-    if (!OnlyUpdate) {

-      if (PosName.empty())

-        return IA_AddNewMember;

-      return IA_MoveNewMember;

-    }

-

-    // We could try to optimize this to a fstat, but it is not a common

-    // operation.

-    sys::fs::file_status Status;

-    failIfError(sys::fs::status(*MI, Status), *MI);

-    auto ModTimeOrErr = Member.getLastModified();

-    failIfError(ModTimeOrErr.takeError());

-    if (Status.getLastModificationTime() < ModTimeOrErr.get()) {

-      if (PosName.empty())

-        return IA_AddOldMember;

-      return IA_MoveOldMember;

-    }

-

-    if (PosName.empty())

-      return IA_AddNewMember;

-    return IA_MoveNewMember;

-  }

-  llvm_unreachable("No such operation");

-}

-

-// We have to walk this twice and computing it is not trivial, so creating an

-// explicit std::vector is actually fairly efficient.

-static std::vector<NewArchiveMember>

-computeNewArchiveMembers(ArchiveOperation Operation,

-                         object::Archive *OldArchive) {

-  std::vector<NewArchiveMember> Ret;

-  std::vector<NewArchiveMember> Moved;

-  int InsertPos = -1;

-  StringRef PosName = sys::path::filename(RelPos);

-  if (OldArchive) {

-    Error Err = Error::success();

-    for (auto &Child : OldArchive->children(Err)) {

-      int Pos = Ret.size();

-      Expected<StringRef> NameOrErr = Child.getName();

-      failIfError(NameOrErr.takeError());

-      StringRef Name = NameOrErr.get();

-      if (Name == PosName) {

-        assert(AddAfter || AddBefore);

-        if (AddBefore)

-          InsertPos = Pos;

-        else

-          InsertPos = Pos + 1;

-      }

-

-      std::vector<StringRef>::iterator MemberI = Members.end();

-      InsertAction Action =

-          computeInsertAction(Operation, Child, Name, MemberI);

-      switch (Action) {

-      case IA_AddOldMember:

-        addMember(Ret, Child);

-        break;

-      case IA_AddNewMember:

-        addMember(Ret, *MemberI);

-        break;

-      case IA_Delete:

-        break;

-      case IA_MoveOldMember:

-        addMember(Moved, Child);

-        break;

-      case IA_MoveNewMember:

-        addMember(Moved, *MemberI);

-        break;

-      }

-      if (MemberI != Members.end())

-        Members.erase(MemberI);

-    }

-    failIfError(std::move(Err));

-  }

-

-  if (Operation == Delete)

-    return Ret;

-

-  if (!RelPos.empty() && InsertPos == -1)

-    fail("Insertion point not found");

-

-  if (RelPos.empty())

-    InsertPos = Ret.size();

-

-  assert(unsigned(InsertPos) <= Ret.size());

-  int Pos = InsertPos;

-  for (auto &M : Moved) {

-    Ret.insert(Ret.begin() + Pos, std::move(M));

-    ++Pos;

-  }

-

-  if (AddLibrary) {

-    assert(Operation == QuickAppend);

-    for (auto &Member : Members)

-      addLibMember(Ret, Member);

-    return Ret;

-  }

-

-  for (unsigned I = 0; I != Members.size(); ++I)

-    Ret.insert(Ret.begin() + InsertPos, NewArchiveMember());

-  Pos = InsertPos;

-  for (auto &Member : Members) {

-    addMember(Ret, Member, Pos);

-    ++Pos;

-  }

-

-  return Ret;

-}

-

-static object::Archive::Kind getDefaultForHost() {

-  return Triple(sys::getProcessTriple()).isOSDarwin()

-             ? object::Archive::K_DARWIN

-             : object::Archive::K_GNU;

-}

-

-static object::Archive::Kind getKindFromMember(const NewArchiveMember &Member) {

-  Expected<std::unique_ptr<object::ObjectFile>> OptionalObject =

-      object::ObjectFile::createObjectFile(Member.Buf->getMemBufferRef());

-

-  if (OptionalObject)

-    return isa<object::MachOObjectFile>(**OptionalObject)

-               ? object::Archive::K_DARWIN

-               : object::Archive::K_GNU;

-

-  // squelch the error in case we had a non-object file

-  consumeError(OptionalObject.takeError());

-  return getDefaultForHost();

-}

-

-static void

-performWriteOperation(ArchiveOperation Operation,

-                      object::Archive *OldArchive,

-                      std::unique_ptr<MemoryBuffer> OldArchiveBuf,

-                      std::vector<NewArchiveMember> *NewMembersP) {

-  std::vector<NewArchiveMember> NewMembers;

-  if (!NewMembersP)

-    NewMembers = computeNewArchiveMembers(Operation, OldArchive);

-

-  object::Archive::Kind Kind;

-  switch (FormatType) {

-  case Default:

-    if (Thin)

-      Kind = object::Archive::K_GNU;

-    else if (OldArchive)

-      Kind = OldArchive->kind();

-    else if (NewMembersP)

-      Kind = NewMembersP->size() ? getKindFromMember(NewMembersP->front())

-                                 : getDefaultForHost();

-    else

-      Kind = NewMembers.size() ? getKindFromMember(NewMembers.front())

-                               : getDefaultForHost();

-    break;

-  case GNU:

-    Kind = object::Archive::K_GNU;

-    break;

-  case BSD:

-    if (Thin)

-      fail("Only the gnu format has a thin mode");

-    Kind = object::Archive::K_BSD;

-    break;

-  case DARWIN:

-    if (Thin)

-      fail("Only the gnu format has a thin mode");

-    Kind = object::Archive::K_DARWIN;

-    break;

-  case Unknown:

-    llvm_unreachable("");

-  }

-

-  Error E =

-      writeArchive(ArchiveName, NewMembersP ? *NewMembersP : NewMembers, Symtab,

-                   Kind, Deterministic, Thin, std::move(OldArchiveBuf));

-  failIfError(std::move(E), ArchiveName);

-}

-

-static void createSymbolTable(object::Archive *OldArchive) {

-  // When an archive is created or modified, if the s option is given, the

-  // resulting archive will have a current symbol table. If the S option

-  // is given, it will have no symbol table.

-  // In summary, we only need to update the symbol table if we have none.

-  // This is actually very common because of broken build systems that think

-  // they have to run ranlib.

-  if (OldArchive->hasSymbolTable())

-    return;

-

-  performWriteOperation(CreateSymTab, OldArchive, nullptr, nullptr);

-}

-

-static void performOperation(ArchiveOperation Operation,

-                             object::Archive *OldArchive,

-                             std::unique_ptr<MemoryBuffer> OldArchiveBuf,

-                             std::vector<NewArchiveMember> *NewMembers) {

-  switch (Operation) {

-  case Print:

-  case DisplayTable:

-  case Extract:

-    performReadOperation(Operation, OldArchive);

-    return;

-

-  case Delete:

-  case Move:

-  case QuickAppend:

-  case ReplaceOrInsert:

-    performWriteOperation(Operation, OldArchive, std::move(OldArchiveBuf),

-                          NewMembers);

-    return;

-  case CreateSymTab:

-    createSymbolTable(OldArchive);

-    return;

-  }

-  llvm_unreachable("Unknown operation.");

-}

-

-static int performOperation(ArchiveOperation Operation,

-                            std::vector<NewArchiveMember> *NewMembers) {

-  // Create or open the archive object.

-  ErrorOr<std::unique_ptr<MemoryBuffer>> Buf =

-      MemoryBuffer::getFile(ArchiveName, -1, false);

-  std::error_code EC = Buf.getError();

-  if (EC && EC != errc::no_such_file_or_directory)

-    fail("error opening '" + ArchiveName + "': " + EC.message() + "!");

-

-  if (!EC) {

-    Error Err = Error::success();

-    object::Archive Archive(Buf.get()->getMemBufferRef(), Err);

-    EC = errorToErrorCode(std::move(Err));

-    failIfError(EC,

-                "error loading '" + ArchiveName + "': " + EC.message() + "!");

-    performOperation(Operation, &Archive, std::move(Buf.get()), NewMembers);

-    return 0;

-  }

-

-  assert(EC == errc::no_such_file_or_directory);

-

-  if (!shouldCreateArchive(Operation)) {

-    failIfError(EC, Twine("error loading '") + ArchiveName + "'");

-  } else {

-    if (!Create) {

-      // Produce a warning if we should and we're creating the archive

-      errs() << ToolName << ": creating " << ArchiveName << "\n";

-    }

-  }

-

-  performOperation(Operation, nullptr, nullptr, NewMembers);

-  return 0;

-}

-

-static void runMRIScript() {

-  enum class MRICommand { AddLib, AddMod, Create, Delete, Save, End, Invalid };

-

-  ErrorOr<std::unique_ptr<MemoryBuffer>> Buf = MemoryBuffer::getSTDIN();

-  failIfError(Buf.getError());

-  const MemoryBuffer &Ref = *Buf.get();

-  bool Saved = false;

-  std::vector<NewArchiveMember> NewMembers;

-

-  for (line_iterator I(Ref, /*SkipBlanks*/ false), E; I != E; ++I) {

-    StringRef Line = *I;

-    Line = Line.split(';').first;

-    Line = Line.split('*').first;

-    Line = Line.trim();

-    if (Line.empty())

-      continue;

-    StringRef CommandStr, Rest;

-    std::tie(CommandStr, Rest) = Line.split(' ');

-    Rest = Rest.trim();

-    if (!Rest.empty() && Rest.front() == '"' && Rest.back() == '"')

-      Rest = Rest.drop_front().drop_back();

-    auto Command = StringSwitch<MRICommand>(CommandStr.lower())

-                       .Case("addlib", MRICommand::AddLib)

-                       .Case("addmod", MRICommand::AddMod)

-                       .Case("create", MRICommand::Create)

-                       .Case("delete", MRICommand::Delete)

-                       .Case("save", MRICommand::Save)

-                       .Case("end", MRICommand::End)

-                       .Default(MRICommand::Invalid);

-

-    switch (Command) {

-    case MRICommand::AddLib: {

-      object::Archive &Lib = readLibrary(Rest);

-      {

-        Error Err = Error::success();

-        for (auto &Member : Lib.children(Err))

-          addMember(NewMembers, Member);

-        failIfError(std::move(Err));

-      }

-      break;

-    }

-    case MRICommand::AddMod:

-      addMember(NewMembers, Rest);

-      break;

-    case MRICommand::Create:

-      Create = true;

-      if (!ArchiveName.empty())

-        fail("Editing multiple archives not supported");

-      if (Saved)

-        fail("File already saved");

-      ArchiveName = Rest;

-      break;

-    case MRICommand::Delete: {

-      StringRef Name = sys::path::filename(Rest);

-      llvm::erase_if(NewMembers,

-                     [=](NewArchiveMember &M) { return M.MemberName == Name; });

-      break;

-    }

-    case MRICommand::Save:

-      Saved = true;

-      break;

-    case MRICommand::End:

-      break;

-    case MRICommand::Invalid:

-      fail("Unknown command: " + CommandStr);

-    }

-  }

-

-  // Nothing to do if not saved.

-  if (Saved)

-    performOperation(ReplaceOrInsert, &NewMembers);

-  exit(0);

-}

-

-static bool handleGenericOption(StringRef arg) {

-  if (arg == "-help" || arg == "--help") {

-    printHelpMessage();

-    return true;

-  }

-  if (arg == "-version" || arg == "--version") {

-    cl::PrintVersionMessage();

-    return true;

-  }

-  return false;

-}

-

-static int ar_main(int argc, char **argv) {

-  SmallVector<const char *, 0> Argv(argv, argv + argc);

-  BumpPtrAllocator Alloc;

-  StringSaver Saver(Alloc);

-  cl::ExpandResponseFiles(Saver, cl::TokenizeGNUCommandLine, Argv);

-  for(size_t i = 1; i < Argv.size(); ++i) {

-    StringRef Arg = Argv[i];

-    const char *match;

-    auto MatchFlagWithArg = [&](const char *expected) {

-      size_t len = strlen(expected);

-      if (Arg == expected) {

-        if (++i >= Argv.size())

-          fail(std::string(expected) + " requires an argument");

-        match = Argv[i];

-        return true;

-      }

-      if (Arg.startswith(expected) && Arg.size() > len &&

-                 Arg[len] == '=') {

-        match = Arg.data() + len + 1;

-        return true;

-      }

-      return false;

-    };

-    if (handleGenericOption(Argv[i]))

-      return 0;

-    if (Arg == "--") {

-      for(; i < Argv.size(); ++i)

-        PositionalArgs.push_back(Argv[i]);

-      break;

-    }

-    if (Arg[0] == '-') {

-      if (Arg.startswith("--"))

-        Arg = Argv[i] + 2;

-      else

-        Arg = Argv[i] + 1;

-      if (Arg == "M") {

-        MRI = true;

-      } else if (MatchFlagWithArg("format")) {

-        FormatType = StringSwitch<Format>(match)

-            .Case("default", Default)

-            .Case("gnu", GNU)

-            .Case("darwin", DARWIN)

-            .Case("bsd", BSD)

-            .Default(Unknown);

-        if (FormatType == Unknown)

-          fail(std::string("Invalid format ") + match);

-      } else if (MatchFlagWithArg("plugin")) {

-        // Ignored.

-      } else {

-        Options += Argv[i] + 1;

-      }

-    } else if (Options.empty()) {

-      Options += Argv[i];

-    } else {

-      PositionalArgs.push_back(Argv[i]);

-    }

-  }

-  ArchiveOperation Operation = parseCommandLine();

-  return performOperation(Operation, nullptr);

-}

-

-static int ranlib_main(int argc, char **argv) {

-  bool ArchiveSpecified = false;

-  for(int i = 1; i < argc; ++i) {

-    if (handleGenericOption(argv[i])) {

-      return 0;

-    } else {

-      if (ArchiveSpecified)

-        fail("Exactly one archive should be specified");

-      ArchiveSpecified = true;

-      ArchiveName = argv[i];

-    }

-  }

-  return performOperation(CreateSymTab, nullptr);

-}

-

-int main(int argc, char **argv) {

-  InitLLVM X(argc, argv);

-  ToolName = argv[0];

-

-  llvm::InitializeAllTargetInfos();

-  llvm::InitializeAllTargetMCs();

-  llvm::InitializeAllAsmParsers();

-

-  Stem = sys::path::stem(ToolName);

-  if (Stem.contains_lower("dlltool"))

-    return dlltoolDriverMain(makeArrayRef(argv, argc));

-

-  if (Stem.contains_lower("ranlib"))

-    return ranlib_main(argc, argv);

-

-  if (Stem.contains_lower("lib"))

-    return libDriverMain(makeArrayRef(argv, argc));

-

-  if (Stem.contains_lower("ar"))

-    return ar_main(argc, argv);

-  fail("Not ranlib, ar, lib or dlltool!");

-}

+//===-- llvm-ar.cpp - LLVM archive librarian utility ----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Builds up (relatively) standard unix archive files (.a) containing LLVM
+// bitcode or other files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/Object/Archive.h"
+#include "llvm/Object/ArchiveWriter.h"
+#include "llvm/Object/MachO.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/Chrono.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/FormatVariadic.h"
+#include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LineIterator.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/StringSaver.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/ToolDrivers/llvm-dlltool/DlltoolDriver.h"
+#include "llvm/ToolDrivers/llvm-lib/LibDriver.h"
+
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
+#include <unistd.h>
+#else
+#include <io.h>
+#endif
+
+using namespace llvm;
+
+// The name this program was invoked as.
+static StringRef ToolName;
+
+// The basename of this program.
+static StringRef Stem;
+
+const char RanlibHelp[] = R"(
+OVERVIEW: LLVM Ranlib (llvm-ranlib)
+
+  This program generates an index to speed access to archives
+
+USAGE: llvm-ranlib <archive-file>
+
+OPTIONS:
+  -help                             - Display available options
+  -version                          - Display the version of this program
+)";
+
+const char ArHelp[] = R"(
+OVERVIEW: LLVM Archiver
+
+USAGE: llvm-ar [options] [-]<operation>[modifiers] [relpos] <archive> [files]
+       llvm-ar -M [<mri-script]
+
+OPTIONS:
+  --format              - Archive format to create
+    =default            -   default
+    =gnu                -   gnu
+    =darwin             -   darwin
+    =bsd                -   bsd
+  --plugin=<string>     - Ignored for compatibility
+  --help                - Display available options
+  --version             - Display the version of this program
+
+OPERATIONS:
+  d - delete [files] from the archive
+  m - move [files] in the archive
+  p - print [files] found in the archive
+  q - quick append [files] to the archive
+  r - replace or insert [files] into the archive
+  s - act as ranlib
+  t - display contents of archive
+  x - extract [files] from the archive
+
+MODIFIERS:
+  [a] - put [files] after [relpos]
+  [b] - put [files] before [relpos] (same as [i])
+  [c] - do not warn if archive had to be created
+  [D] - use zero for timestamps and uids/gids (default)
+  [i] - put [files] before [relpos] (same as [b])
+  [l] - ignored for compatibility
+  [L] - add archive's contents
+  [o] - preserve original dates
+  [s] - create an archive index (cf. ranlib)
+  [S] - do not build a symbol table
+  [T] - create a thin archive
+  [u] - update only [files] newer than archive contents
+  [U] - use actual timestamps and uids/gids
+  [v] - be verbose about actions taken
+)";
+
+void printHelpMessage() {
+  if (Stem.contains_lower("ranlib"))
+    outs() << RanlibHelp;
+  else if (Stem.contains_lower("ar"))
+    outs() << ArHelp;
+}
+
+// Show the error message and exit.
+LLVM_ATTRIBUTE_NORETURN static void fail(Twine Error) {
+  errs() << ToolName << ": " << Error << ".\n";
+  printHelpMessage();
+  exit(1);
+}
+
+static void failIfError(std::error_code EC, Twine Context = "") {
+  if (!EC)
+    return;
+
+  std::string ContextStr = Context.str();
+  if (ContextStr == "")
+    fail(EC.message());
+  fail(Context + ": " + EC.message());
+}
+
+static void failIfError(Error E, Twine Context = "") {
+  if (!E)
+    return;
+
+  handleAllErrors(std::move(E), [&](const llvm::ErrorInfoBase &EIB) {
+    std::string ContextStr = Context.str();
+    if (ContextStr == "")
+      fail(EIB.message());
+    fail(Context + ": " + EIB.message());
+  });
+}
+
+static SmallVector<const char *, 256> PositionalArgs;
+
+static bool MRI;
+
+namespace {
+enum Format { Default, GNU, BSD, DARWIN, Unknown };
+}
+
+static Format FormatType = Default;
+
+static std::string Options;
+
+// This enumeration delineates the kinds of operations on an archive
+// that are permitted.
+enum ArchiveOperation {
+  Print,           ///< Print the contents of the archive
+  Delete,          ///< Delete the specified members
+  Move,            ///< Move members to end or as given by {a,b,i} modifiers
+  QuickAppend,     ///< Quickly append to end of archive
+  ReplaceOrInsert, ///< Replace or Insert members
+  DisplayTable,    ///< Display the table of contents
+  Extract,         ///< Extract files back to file system
+  CreateSymTab     ///< Create a symbol table in an existing archive
+};
+
+// Modifiers to follow operation to vary behavior
+static bool AddAfter = false;      ///< 'a' modifier
+static bool AddBefore = false;     ///< 'b' modifier
+static bool Create = false;        ///< 'c' modifier
+static bool OriginalDates = false; ///< 'o' modifier
+static bool OnlyUpdate = false;    ///< 'u' modifier
+static bool Verbose = false;       ///< 'v' modifier
+static bool Symtab = true;         ///< 's' modifier
+static bool Deterministic = true;  ///< 'D' and 'U' modifiers
+static bool Thin = false;          ///< 'T' modifier
+static bool AddLibrary = false;    ///< 'L' modifier
+
+// Relative Positional Argument (for insert/move). This variable holds
+// the name of the archive member to which the 'a', 'b' or 'i' modifier
+// refers. Only one of 'a', 'b' or 'i' can be specified so we only need
+// one variable.
+static std::string RelPos;
+
+// This variable holds the name of the archive file as given on the
+// command line.
+static std::string ArchiveName;
+
+// This variable holds the list of member files to proecess, as given
+// on the command line.
+static std::vector<StringRef> Members;
+
+// Extract the member filename from the command line for the [relpos] argument
+// associated with a, b, and i modifiers
+static void getRelPos() {
+  if (PositionalArgs.size() == 0)
+    fail("Expected [relpos] for a, b, or i modifier");
+  RelPos = PositionalArgs[0];
+  PositionalArgs.erase(PositionalArgs.begin());
+}
+
+// Get the archive file name from the command line
+static void getArchive() {
+  if (PositionalArgs.size() == 0)
+    fail("An archive name must be specified");
+  ArchiveName = PositionalArgs[0];
+  PositionalArgs.erase(PositionalArgs.begin());
+}
+
+// Copy over remaining items in PositionalArgs to our Members vector
+static void getMembers() {
+  for (auto &Arg : PositionalArgs)
+    Members.push_back(Arg);
+}
+
+std::vector<std::unique_ptr<MemoryBuffer>> ArchiveBuffers;
+std::vector<std::unique_ptr<object::Archive>> Archives;
+
+static object::Archive &readLibrary(const Twine &Library) {
+  auto BufOrErr = MemoryBuffer::getFile(Library, -1, false);
+  failIfError(BufOrErr.getError(), "Could not open library");
+  ArchiveBuffers.push_back(std::move(*BufOrErr));
+  auto LibOrErr =
+      object::Archive::create(ArchiveBuffers.back()->getMemBufferRef());
+  failIfError(errorToErrorCode(LibOrErr.takeError()),
+              "Could not parse library");
+  Archives.push_back(std::move(*LibOrErr));
+  return *Archives.back();
+}
+
+static void runMRIScript();
+
+// Parse the command line options as presented and return the operation
+// specified. Process all modifiers and check to make sure that constraints on
+// modifier/operation pairs have not been violated.
+static ArchiveOperation parseCommandLine() {
+  if (MRI) {
+    if (!PositionalArgs.empty() || !Options.empty())
+      fail("Cannot mix -M and other options");
+    runMRIScript();
+  }
+
+  // Keep track of number of operations. We can only specify one
+  // per execution.
+  unsigned NumOperations = 0;
+
+  // Keep track of the number of positional modifiers (a,b,i). Only
+  // one can be specified.
+  unsigned NumPositional = 0;
+
+  // Keep track of which operation was requested
+  ArchiveOperation Operation;
+
+  bool MaybeJustCreateSymTab = false;
+
+  for (unsigned i = 0; i < Options.size(); ++i) {
+    switch (Options[i]) {
+    case 'd':
+      ++NumOperations;
+      Operation = Delete;
+      break;
+    case 'm':
+      ++NumOperations;
+      Operation = Move;
+      break;
+    case 'p':
+      ++NumOperations;
+      Operation = Print;
+      break;
+    case 'q':
+      ++NumOperations;
+      Operation = QuickAppend;
+      break;
+    case 'r':
+      ++NumOperations;
+      Operation = ReplaceOrInsert;
+      break;
+    case 't':
+      ++NumOperations;
+      Operation = DisplayTable;
+      break;
+    case 'x':
+      ++NumOperations;
+      Operation = Extract;
+      break;
+    case 'c':
+      Create = true;
+      break;
+    case 'l': /* accepted but unused */
+      break;
+    case 'o':
+      OriginalDates = true;
+      break;
+    case 's':
+      Symtab = true;
+      MaybeJustCreateSymTab = true;
+      break;
+    case 'S':
+      Symtab = false;
+      break;
+    case 'u':
+      OnlyUpdate = true;
+      break;
+    case 'v':
+      Verbose = true;
+      break;
+    case 'a':
+      getRelPos();
+      AddAfter = true;
+      NumPositional++;
+      break;
+    case 'b':
+      getRelPos();
+      AddBefore = true;
+      NumPositional++;
+      break;
+    case 'i':
+      getRelPos();
+      AddBefore = true;
+      NumPositional++;
+      break;
+    case 'D':
+      Deterministic = true;
+      break;
+    case 'U':
+      Deterministic = false;
+      break;
+    case 'T':
+      Thin = true;
+      break;
+    case 'L':
+      AddLibrary = true;
+      break;
+    default:
+      fail(std::string("unknown option ") + Options[i]);
+    }
+  }
+
+  // At this point, the next thing on the command line must be
+  // the archive name.
+  getArchive();
+
+  // Everything on the command line at this point is a member.
+  getMembers();
+
+  if (NumOperations == 0 && MaybeJustCreateSymTab) {
+    NumOperations = 1;
+    Operation = CreateSymTab;
+    if (!Members.empty())
+      fail("The s operation takes only an archive as argument");
+  }
+
+  // Perform various checks on the operation/modifier specification
+  // to make sure we are dealing with a legal request.
+  if (NumOperations == 0)
+    fail("You must specify at least one of the operations");
+  if (NumOperations > 1)
+    fail("Only one operation may be specified");
+  if (NumPositional > 1)
+    fail("You may only specify one of a, b, and i modifiers");
+  if (AddAfter || AddBefore) {
+    if (Operation != Move && Operation != ReplaceOrInsert)
+      fail("The 'a', 'b' and 'i' modifiers can only be specified with "
+           "the 'm' or 'r' operations");
+  }
+  if (OriginalDates && Operation != Extract)
+    fail("The 'o' modifier is only applicable to the 'x' operation");
+  if (OnlyUpdate && Operation != ReplaceOrInsert)
+    fail("The 'u' modifier is only applicable to the 'r' operation");
+  if (AddLibrary && Operation != QuickAppend)
+    fail("The 'L' modifier is only applicable to the 'q' operation");
+
+  // Return the parsed operation to the caller
+  return Operation;
+}
+
+// Implements the 'p' operation. This function traverses the archive
+// looking for members that match the path list.
+static void doPrint(StringRef Name, const object::Archive::Child &C) {
+  if (Verbose)
+    outs() << "Printing " << Name << "\n";
+
+  Expected<StringRef> DataOrErr = C.getBuffer();
+  failIfError(DataOrErr.takeError());
+  StringRef Data = *DataOrErr;
+  outs().write(Data.data(), Data.size());
+}
+
+// Utility function for printing out the file mode when the 't' operation is in
+// verbose mode.
+static void printMode(unsigned mode) {
+  outs() << ((mode & 004) ? "r" : "-");
+  outs() << ((mode & 002) ? "w" : "-");
+  outs() << ((mode & 001) ? "x" : "-");
+}
+
+// Implement the 't' operation. This function prints out just
+// the file names of each of the members. However, if verbose mode is requested
+// ('v' modifier) then the file type, permission mode, user, group, size, and
+// modification time are also printed.
+static void doDisplayTable(StringRef Name, const object::Archive::Child &C) {
+  if (Verbose) {
+    Expected<sys::fs::perms> ModeOrErr = C.getAccessMode();
+    failIfError(ModeOrErr.takeError());
+    sys::fs::perms Mode = ModeOrErr.get();
+    printMode((Mode >> 6) & 007);
+    printMode((Mode >> 3) & 007);
+    printMode(Mode & 007);
+    Expected<unsigned> UIDOrErr = C.getUID();
+    failIfError(UIDOrErr.takeError());
+    outs() << ' ' << UIDOrErr.get();
+    Expected<unsigned> GIDOrErr = C.getGID();
+    failIfError(GIDOrErr.takeError());
+    outs() << '/' << GIDOrErr.get();
+    Expected<uint64_t> Size = C.getSize();
+    failIfError(Size.takeError());
+    outs() << ' ' << format("%6llu", Size.get());
+    auto ModTimeOrErr = C.getLastModified();
+    failIfError(ModTimeOrErr.takeError());
+    // Note: formatv() only handles the default TimePoint<>, which is in
+    // nanoseconds.
+    // TODO: fix format_provider<TimePoint<>> to allow other units.
+    sys::TimePoint<> ModTimeInNs = ModTimeOrErr.get();
+    outs() << ' ' << formatv("{0:%b %e %H:%M %Y}", ModTimeInNs);
+    outs() << ' ';
+  }
+
+  if (C.getParent()->isThin()) {
+    outs() << sys::path::parent_path(ArchiveName);
+    outs() << '/';
+  }
+  outs() << Name << "\n";
+}
+
+// Implement the 'x' operation. This function extracts files back to the file
+// system.
+static void doExtract(StringRef Name, const object::Archive::Child &C) {
+  // Retain the original mode.
+  Expected<sys::fs::perms> ModeOrErr = C.getAccessMode();
+  failIfError(ModeOrErr.takeError());
+  sys::fs::perms Mode = ModeOrErr.get();
+
+  int FD;
+  failIfError(sys::fs::openFileForWrite(sys::path::filename(Name), FD,
+                                        sys::fs::CD_CreateAlways,
+                                        sys::fs::F_None, Mode),
+              Name);
+
+  {
+    raw_fd_ostream file(FD, false);
+
+    // Get the data and its length
+    Expected<StringRef> BufOrErr = C.getBuffer();
+    failIfError(BufOrErr.takeError());
+    StringRef Data = BufOrErr.get();
+
+    // Write the data.
+    file.write(Data.data(), Data.size());
+  }
+
+  // If we're supposed to retain the original modification times, etc. do so
+  // now.
+  if (OriginalDates) {
+    auto ModTimeOrErr = C.getLastModified();
+    failIfError(ModTimeOrErr.takeError());
+    failIfError(
+        sys::fs::setLastAccessAndModificationTime(FD, ModTimeOrErr.get()));
+  }
+
+  if (close(FD))
+    fail("Could not close the file");
+}
+
+static bool shouldCreateArchive(ArchiveOperation Op) {
+  switch (Op) {
+  case Print:
+  case Delete:
+  case Move:
+  case DisplayTable:
+  case Extract:
+  case CreateSymTab:
+    return false;
+
+  case QuickAppend:
+  case ReplaceOrInsert:
+    return true;
+  }
+
+  llvm_unreachable("Missing entry in covered switch.");
+}
+
+static void performReadOperation(ArchiveOperation Operation,
+                                 object::Archive *OldArchive) {
+  if (Operation == Extract && OldArchive->isThin())
+    fail("extracting from a thin archive is not supported");
+
+  bool Filter = !Members.empty();
+  {
+    Error Err = Error::success();
+    for (auto &C : OldArchive->children(Err)) {
+      Expected<StringRef> NameOrErr = C.getName();
+      failIfError(NameOrErr.takeError());
+      StringRef Name = NameOrErr.get();
+
+      if (Filter) {
+        auto I = find(Members, Name);
+        if (I == Members.end())
+          continue;
+        Members.erase(I);
+      }
+
+      switch (Operation) {
+      default:
+        llvm_unreachable("Not a read operation");
+      case Print:
+        doPrint(Name, C);
+        break;
+      case DisplayTable:
+        doDisplayTable(Name, C);
+        break;
+      case Extract:
+        doExtract(Name, C);
+        break;
+      }
+    }
+    failIfError(std::move(Err));
+  }
+
+  if (Members.empty())
+    return;
+  for (StringRef Name : Members)
+    errs() << Name << " was not found\n";
+  exit(1);
+}
+
+static void addMember(std::vector<NewArchiveMember> &Members,
+                      StringRef FileName, int Pos = -1) {
+  Expected<NewArchiveMember> NMOrErr =
+      NewArchiveMember::getFile(FileName, Deterministic);
+  failIfError(NMOrErr.takeError(), FileName);
+
+  // Use the basename of the object path for the member name.
+  NMOrErr->MemberName = sys::path::filename(NMOrErr->MemberName);
+
+  if (Pos == -1)
+    Members.push_back(std::move(*NMOrErr));
+  else
+    Members[Pos] = std::move(*NMOrErr);
+}
+
+static void addMember(std::vector<NewArchiveMember> &Members,
+                      const object::Archive::Child &M, int Pos = -1) {
+  if (Thin && !M.getParent()->isThin())
+    fail("Cannot convert a regular archive to a thin one");
+  Expected<NewArchiveMember> NMOrErr =
+      NewArchiveMember::getOldMember(M, Deterministic);
+  failIfError(NMOrErr.takeError());
+  if (Pos == -1)
+    Members.push_back(std::move(*NMOrErr));
+  else
+    Members[Pos] = std::move(*NMOrErr);
+}
+
+static void addLibMember(std::vector<NewArchiveMember> &Members,
+                         StringRef FileName) {
+  Expected<NewArchiveMember> NMOrErr =
+      NewArchiveMember::getFile(FileName, Deterministic);
+  failIfError(NMOrErr.takeError(), FileName);
+  if (identify_magic(NMOrErr->Buf->getBuffer()) == file_magic::archive) {
+    object::Archive &Lib = readLibrary(FileName);
+    Error Err = Error::success();
+
+    for (auto &Child : Lib.children(Err))
+      addMember(Members, Child);
+
+    failIfError(std::move(Err));
+  } else {
+    // Use the basename of the object path for the member name.
+    NMOrErr->MemberName = sys::path::filename(NMOrErr->MemberName);
+    Members.push_back(std::move(*NMOrErr));
+  }
+}
+
+enum InsertAction {
+  IA_AddOldMember,
+  IA_AddNewMember,
+  IA_Delete,
+  IA_MoveOldMember,
+  IA_MoveNewMember
+};
+
+static InsertAction computeInsertAction(ArchiveOperation Operation,
+                                        const object::Archive::Child &Member,
+                                        StringRef Name,
+                                        std::vector<StringRef>::iterator &Pos) {
+  if (Operation == QuickAppend || Members.empty())
+    return IA_AddOldMember;
+
+  auto MI = find_if(Members, [Name](StringRef Path) {
+    return Name == sys::path::filename(Path);
+  });
+
+  if (MI == Members.end())
+    return IA_AddOldMember;
+
+  Pos = MI;
+
+  if (Operation == Delete)
+    return IA_Delete;
+
+  if (Operation == Move)
+    return IA_MoveOldMember;
+
+  if (Operation == ReplaceOrInsert) {
+    StringRef PosName = sys::path::filename(RelPos);
+    if (!OnlyUpdate) {
+      if (PosName.empty())
+        return IA_AddNewMember;
+      return IA_MoveNewMember;
+    }
+
+    // We could try to optimize this to a fstat, but it is not a common
+    // operation.
+    sys::fs::file_status Status;
+    failIfError(sys::fs::status(*MI, Status), *MI);
+    auto ModTimeOrErr = Member.getLastModified();
+    failIfError(ModTimeOrErr.takeError());
+    if (Status.getLastModificationTime() < ModTimeOrErr.get()) {
+      if (PosName.empty())
+        return IA_AddOldMember;
+      return IA_MoveOldMember;
+    }
+
+    if (PosName.empty())
+      return IA_AddNewMember;
+    return IA_MoveNewMember;
+  }
+  llvm_unreachable("No such operation");
+}
+
+// We have to walk this twice and computing it is not trivial, so creating an
+// explicit std::vector is actually fairly efficient.
+static std::vector<NewArchiveMember>
+computeNewArchiveMembers(ArchiveOperation Operation,
+                         object::Archive *OldArchive) {
+  std::vector<NewArchiveMember> Ret;
+  std::vector<NewArchiveMember> Moved;
+  int InsertPos = -1;
+  StringRef PosName = sys::path::filename(RelPos);
+  if (OldArchive) {
+    Error Err = Error::success();
+    for (auto &Child : OldArchive->children(Err)) {
+      int Pos = Ret.size();
+      Expected<StringRef> NameOrErr = Child.getName();
+      failIfError(NameOrErr.takeError());
+      StringRef Name = NameOrErr.get();
+      if (Name == PosName) {
+        assert(AddAfter || AddBefore);
+        if (AddBefore)
+          InsertPos = Pos;
+        else
+          InsertPos = Pos + 1;
+      }
+
+      std::vector<StringRef>::iterator MemberI = Members.end();
+      InsertAction Action =
+          computeInsertAction(Operation, Child, Name, MemberI);
+      switch (Action) {
+      case IA_AddOldMember:
+        addMember(Ret, Child);
+        break;
+      case IA_AddNewMember:
+        addMember(Ret, *MemberI);
+        break;
+      case IA_Delete:
+        break;
+      case IA_MoveOldMember:
+        addMember(Moved, Child);
+        break;
+      case IA_MoveNewMember:
+        addMember(Moved, *MemberI);
+        break;
+      }
+      if (MemberI != Members.end())
+        Members.erase(MemberI);
+    }
+    failIfError(std::move(Err));
+  }
+
+  if (Operation == Delete)
+    return Ret;
+
+  if (!RelPos.empty() && InsertPos == -1)
+    fail("Insertion point not found");
+
+  if (RelPos.empty())
+    InsertPos = Ret.size();
+
+  assert(unsigned(InsertPos) <= Ret.size());
+  int Pos = InsertPos;
+  for (auto &M : Moved) {
+    Ret.insert(Ret.begin() + Pos, std::move(M));
+    ++Pos;
+  }
+
+  if (AddLibrary) {
+    assert(Operation == QuickAppend);
+    for (auto &Member : Members)
+      addLibMember(Ret, Member);
+    return Ret;
+  }
+
+  for (unsigned I = 0; I != Members.size(); ++I)
+    Ret.insert(Ret.begin() + InsertPos, NewArchiveMember());
+  Pos = InsertPos;
+  for (auto &Member : Members) {
+    addMember(Ret, Member, Pos);
+    ++Pos;
+  }
+
+  return Ret;
+}
+
+static object::Archive::Kind getDefaultForHost() {
+  return Triple(sys::getProcessTriple()).isOSDarwin()
+             ? object::Archive::K_DARWIN
+             : object::Archive::K_GNU;
+}
+
+static object::Archive::Kind getKindFromMember(const NewArchiveMember &Member) {
+  Expected<std::unique_ptr<object::ObjectFile>> OptionalObject =
+      object::ObjectFile::createObjectFile(Member.Buf->getMemBufferRef());
+
+  if (OptionalObject)
+    return isa<object::MachOObjectFile>(**OptionalObject)
+               ? object::Archive::K_DARWIN
+               : object::Archive::K_GNU;
+
+  // squelch the error in case we had a non-object file
+  consumeError(OptionalObject.takeError());
+  return getDefaultForHost();
+}
+
+static void performWriteOperation(ArchiveOperation Operation,
+                                  object::Archive *OldArchive,
+                                  std::unique_ptr<MemoryBuffer> OldArchiveBuf,
+                                  std::vector<NewArchiveMember> *NewMembersP) {
+  std::vector<NewArchiveMember> NewMembers;
+  if (!NewMembersP)
+    NewMembers = computeNewArchiveMembers(Operation, OldArchive);
+
+  object::Archive::Kind Kind;
+  switch (FormatType) {
+  case Default:
+    if (Thin)
+      Kind = object::Archive::K_GNU;
+    else if (OldArchive)
+      Kind = OldArchive->kind();
+    else if (NewMembersP)
+      Kind = NewMembersP->size() ? getKindFromMember(NewMembersP->front())
+                                 : getDefaultForHost();
+    else
+      Kind = NewMembers.size() ? getKindFromMember(NewMembers.front())
+                               : getDefaultForHost();
+    break;
+  case GNU:
+    Kind = object::Archive::K_GNU;
+    break;
+  case BSD:
+    if (Thin)
+      fail("Only the gnu format has a thin mode");
+    Kind = object::Archive::K_BSD;
+    break;
+  case DARWIN:
+    if (Thin)
+      fail("Only the gnu format has a thin mode");
+    Kind = object::Archive::K_DARWIN;
+    break;
+  case Unknown:
+    llvm_unreachable("");
+  }
+
+  Error E =
+      writeArchive(ArchiveName, NewMembersP ? *NewMembersP : NewMembers, Symtab,
+                   Kind, Deterministic, Thin, std::move(OldArchiveBuf));
+  failIfError(std::move(E), ArchiveName);
+}
+
+static void createSymbolTable(object::Archive *OldArchive) {
+  // When an archive is created or modified, if the s option is given, the
+  // resulting archive will have a current symbol table. If the S option
+  // is given, it will have no symbol table.
+  // In summary, we only need to update the symbol table if we have none.
+  // This is actually very common because of broken build systems that think
+  // they have to run ranlib.
+  if (OldArchive->hasSymbolTable())
+    return;
+
+  performWriteOperation(CreateSymTab, OldArchive, nullptr, nullptr);
+}
+
+static void performOperation(ArchiveOperation Operation,
+                             object::Archive *OldArchive,
+                             std::unique_ptr<MemoryBuffer> OldArchiveBuf,
+                             std::vector<NewArchiveMember> *NewMembers) {
+  switch (Operation) {
+  case Print:
+  case DisplayTable:
+  case Extract:
+    performReadOperation(Operation, OldArchive);
+    return;
+
+  case Delete:
+  case Move:
+  case QuickAppend:
+  case ReplaceOrInsert:
+    performWriteOperation(Operation, OldArchive, std::move(OldArchiveBuf),
+                          NewMembers);
+    return;
+  case CreateSymTab:
+    createSymbolTable(OldArchive);
+    return;
+  }
+  llvm_unreachable("Unknown operation.");
+}
+
+static int performOperation(ArchiveOperation Operation,
+                            std::vector<NewArchiveMember> *NewMembers) {
+  // Create or open the archive object.
+  ErrorOr<std::unique_ptr<MemoryBuffer>> Buf =
+      MemoryBuffer::getFile(ArchiveName, -1, false);
+  std::error_code EC = Buf.getError();
+  if (EC && EC != errc::no_such_file_or_directory)
+    fail("error opening '" + ArchiveName + "': " + EC.message() + "!");
+
+  if (!EC) {
+    Error Err = Error::success();
+    object::Archive Archive(Buf.get()->getMemBufferRef(), Err);
+    EC = errorToErrorCode(std::move(Err));
+    failIfError(EC,
+                "error loading '" + ArchiveName + "': " + EC.message() + "!");
+    performOperation(Operation, &Archive, std::move(Buf.get()), NewMembers);
+    return 0;
+  }
+
+  assert(EC == errc::no_such_file_or_directory);
+
+  if (!shouldCreateArchive(Operation)) {
+    failIfError(EC, Twine("error loading '") + ArchiveName + "'");
+  } else {
+    if (!Create) {
+      // Produce a warning if we should and we're creating the archive
+      errs() << ToolName << ": creating " << ArchiveName << "\n";
+    }
+  }
+
+  performOperation(Operation, nullptr, nullptr, NewMembers);
+  return 0;
+}
+
+static void runMRIScript() {
+  enum class MRICommand { AddLib, AddMod, Create, Delete, Save, End, Invalid };
+
+  ErrorOr<std::unique_ptr<MemoryBuffer>> Buf = MemoryBuffer::getSTDIN();
+  failIfError(Buf.getError());
+  const MemoryBuffer &Ref = *Buf.get();
+  bool Saved = false;
+  std::vector<NewArchiveMember> NewMembers;
+
+  for (line_iterator I(Ref, /*SkipBlanks*/ false), E; I != E; ++I) {
+    StringRef Line = *I;
+    Line = Line.split(';').first;
+    Line = Line.split('*').first;
+    Line = Line.trim();
+    if (Line.empty())
+      continue;
+    StringRef CommandStr, Rest;
+    std::tie(CommandStr, Rest) = Line.split(' ');
+    Rest = Rest.trim();
+    if (!Rest.empty() && Rest.front() == '"' && Rest.back() == '"')
+      Rest = Rest.drop_front().drop_back();
+    auto Command = StringSwitch<MRICommand>(CommandStr.lower())
+                       .Case("addlib", MRICommand::AddLib)
+                       .Case("addmod", MRICommand::AddMod)
+                       .Case("create", MRICommand::Create)
+                       .Case("delete", MRICommand::Delete)
+                       .Case("save", MRICommand::Save)
+                       .Case("end", MRICommand::End)
+                       .Default(MRICommand::Invalid);
+
+    switch (Command) {
+    case MRICommand::AddLib: {
+      object::Archive &Lib = readLibrary(Rest);
+      {
+        Error Err = Error::success();
+        for (auto &Member : Lib.children(Err))
+          addMember(NewMembers, Member);
+        failIfError(std::move(Err));
+      }
+      break;
+    }
+    case MRICommand::AddMod:
+      addMember(NewMembers, Rest);
+      break;
+    case MRICommand::Create:
+      Create = true;
+      if (!ArchiveName.empty())
+        fail("Editing multiple archives not supported");
+      if (Saved)
+        fail("File already saved");
+      ArchiveName = Rest;
+      break;
+    case MRICommand::Delete: {
+      StringRef Name = sys::path::filename(Rest);
+      llvm::erase_if(NewMembers,
+                     [=](NewArchiveMember &M) { return M.MemberName == Name; });
+      break;
+    }
+    case MRICommand::Save:
+      Saved = true;
+      break;
+    case MRICommand::End:
+      break;
+    case MRICommand::Invalid:
+      fail("Unknown command: " + CommandStr);
+    }
+  }
+
+  // Nothing to do if not saved.
+  if (Saved)
+    performOperation(ReplaceOrInsert, &NewMembers);
+  exit(0);
+}
+
+static bool handleGenericOption(StringRef arg) {
+  if (arg == "-help" || arg == "--help") {
+    printHelpMessage();
+    return true;
+  }
+  if (arg == "-version" || arg == "--version") {
+    cl::PrintVersionMessage();
+    return true;
+  }
+  return false;
+}
+
+static int ar_main(int argc, char **argv) {
+  SmallVector<const char *, 0> Argv(argv, argv + argc);
+  BumpPtrAllocator Alloc;
+  StringSaver Saver(Alloc);
+  cl::ExpandResponseFiles(Saver, cl::TokenizeGNUCommandLine, Argv);
+  for (size_t i = 1; i < Argv.size(); ++i) {
+    StringRef Arg = Argv[i];
+    const char *match;
+    auto MatchFlagWithArg = [&](const char *expected) {
+      size_t len = strlen(expected);
+      if (Arg == expected) {
+        if (++i >= Argv.size())
+          fail(std::string(expected) + " requires an argument");
+        match = Argv[i];
+        return true;
+      }
+      if (Arg.startswith(expected) && Arg.size() > len && Arg[len] == '=') {
+        match = Arg.data() + len + 1;
+        return true;
+      }
+      return false;
+    };
+    if (handleGenericOption(Argv[i]))
+      return 0;
+    if (Arg == "--") {
+      for (; i < Argv.size(); ++i)
+        PositionalArgs.push_back(Argv[i]);
+      break;
+    }
+    if (Arg[0] == '-') {
+      if (Arg.startswith("--"))
+        Arg = Argv[i] + 2;
+      else
+        Arg = Argv[i] + 1;
+      if (Arg == "M") {
+        MRI = true;
+      } else if (MatchFlagWithArg("format")) {
+        FormatType = StringSwitch<Format>(match)
+                         .Case("default", Default)
+                         .Case("gnu", GNU)
+                         .Case("darwin", DARWIN)
+                         .Case("bsd", BSD)
+                         .Default(Unknown);
+        if (FormatType == Unknown)
+          fail(std::string("Invalid format ") + match);
+      } else if (MatchFlagWithArg("plugin")) {
+        // Ignored.
+      } else {
+        Options += Argv[i] + 1;
+      }
+    } else if (Options.empty()) {
+      Options += Argv[i];
+    } else {
+      PositionalArgs.push_back(Argv[i]);
+    }
+  }
+  ArchiveOperation Operation = parseCommandLine();
+  return performOperation(Operation, nullptr);
+}
+
+static int ranlib_main(int argc, char **argv) {
+  bool ArchiveSpecified = false;
+  for (int i = 1; i < argc; ++i) {
+    if (handleGenericOption(argv[i])) {
+      return 0;
+    } else {
+      if (ArchiveSpecified)
+        fail("Exactly one archive should be specified");
+      ArchiveSpecified = true;
+      ArchiveName = argv[i];
+    }
+  }
+  return performOperation(CreateSymTab, nullptr);
+}
+
+int main(int argc, char **argv) {
+  InitLLVM X(argc, argv);
+  ToolName = argv[0];
+
+  llvm::InitializeAllTargetInfos();
+  llvm::InitializeAllTargetMCs();
+  llvm::InitializeAllAsmParsers();
+
+  Stem = sys::path::stem(ToolName);
+  if (Stem.contains_lower("dlltool"))
+    return dlltoolDriverMain(makeArrayRef(argv, argc));
+
+  if (Stem.contains_lower("ranlib"))
+    return ranlib_main(argc, argv);
+
+  if (Stem.contains_lower("lib"))
+    return libDriverMain(makeArrayRef(argv, argc));
+
+  if (Stem.contains_lower("ar"))
+    return ar_main(argc, argv);
+  fail("Not ranlib, ar, lib or dlltool!");
+}