diff --git a/llvm/lib/Object/ArchiveWriter.cpp b/llvm/lib/Object/ArchiveWriter.cpp
index 93e285c..5357326 100644
--- a/llvm/lib/Object/ArchiveWriter.cpp
+++ b/llvm/lib/Object/ArchiveWriter.cpp
@@ -34,45 +34,61 @@
 
 using namespace llvm;
 
-NewArchiveIterator::NewArchiveIterator(const object::Archive::Child &OldMember,
-                                       StringRef Name)
-    : IsNewMember(false), Name(Name), OldMember(OldMember) {}
+NewArchiveMember::NewArchiveMember(MemoryBufferRef BufRef)
+    : Buf(MemoryBuffer::getMemBuffer(BufRef, false)) {}
 
-NewArchiveIterator::NewArchiveIterator(StringRef FileName)
-    : IsNewMember(true), Name(FileName), OldMember(nullptr, nullptr, nullptr) {}
+Expected<NewArchiveMember>
+NewArchiveMember::getOldMember(const object::Archive::Child &OldMember,
+                               bool Deterministic) {
+  ErrorOr<llvm::MemoryBufferRef> BufOrErr = OldMember.getMemoryBufferRef();
+  if (!BufOrErr)
+    return errorCodeToError(BufOrErr.getError());
 
-StringRef NewArchiveIterator::getName() const { return Name; }
-
-bool NewArchiveIterator::isNewMember() const { return IsNewMember; }
-
-const object::Archive::Child &NewArchiveIterator::getOld() const {
-  assert(!IsNewMember);
-  return OldMember;
+  NewArchiveMember M;
+  M.Buf = MemoryBuffer::getMemBuffer(*BufOrErr, false);
+  if (!Deterministic) {
+    M.ModTime = OldMember.getLastModified();
+    M.UID = OldMember.getUID();
+    M.GID = OldMember.getGID();
+    M.Perms = OldMember.getAccessMode();
+  }
+  return std::move(M);
 }
 
-StringRef NewArchiveIterator::getNew() const {
-  assert(IsNewMember);
-  return Name;
-}
+Expected<NewArchiveMember> NewArchiveMember::getFile(StringRef FileName,
+                                                     bool Deterministic) {
+  sys::fs::file_status Status;
+  int FD;
+  if (auto EC = sys::fs::openFileForRead(FileName, FD))
+    return errorCodeToError(EC);
+  assert(FD != -1);
 
-llvm::ErrorOr<int>
-NewArchiveIterator::getFD(sys::fs::file_status &NewStatus) const {
-  assert(IsNewMember);
-  int NewFD;
-  if (auto EC = sys::fs::openFileForRead(Name, NewFD))
-    return EC;
-  assert(NewFD != -1);
-
-  if (auto EC = sys::fs::status(NewFD, NewStatus))
-    return EC;
+  if (auto EC = sys::fs::status(FD, Status))
+    return errorCodeToError(EC);
 
   // Opening a directory doesn't make sense. Let it fail.
   // Linux cannot open directories with open(2), although
   // cygwin and *bsd can.
-  if (NewStatus.type() == sys::fs::file_type::directory_file)
-    return make_error_code(errc::is_a_directory);
+  if (Status.type() == sys::fs::file_type::directory_file)
+    return errorCodeToError(make_error_code(errc::is_a_directory));
 
-  return NewFD;
+  ErrorOr<std::unique_ptr<MemoryBuffer>> MemberBufferOrErr =
+      MemoryBuffer::getOpenFile(FD, FileName, Status.getSize(), false);
+  if (!MemberBufferOrErr)
+    return errorCodeToError(MemberBufferOrErr.getError());
+
+  if (close(FD) != 0)
+    return errorCodeToError(std::error_code(errno, std::generic_category()));
+
+  NewArchiveMember M;
+  M.Buf = std::move(*MemberBufferOrErr);
+  if (!Deterministic) {
+    M.ModTime = Status.getLastModificationTime();
+    M.UID = Status.getUser();
+    M.GID = Status.getGroup();
+    M.Perms = Status.permissions();
+  }
+  return std::move(M);
 }
 
 template <typename T>
@@ -178,12 +194,13 @@
 }
 
 static void writeStringTable(raw_fd_ostream &Out, StringRef ArcName,
-                             ArrayRef<NewArchiveIterator> Members,
+                             ArrayRef<NewArchiveMember> Members,
                              std::vector<unsigned> &StringMapIndexes,
                              bool Thin) {
   unsigned StartOffset = 0;
-  for (const NewArchiveIterator &I : Members) {
-    StringRef Name = sys::path::filename(I.getName());
+  for (const NewArchiveMember &M : Members) {
+    StringRef Path = M.Buf->getBufferIdentifier();
+    StringRef Name = sys::path::filename(Path);
     if (!useStringTable(Thin, Name))
       continue;
     if (StartOffset == 0) {
@@ -194,7 +211,7 @@
     StringMapIndexes.push_back(Out.tell() - StartOffset);
 
     if (Thin)
-      Out << computeRelativePath(ArcName, I.getName());
+      Out << computeRelativePath(ArcName, Path);
     else
       Out << Name;
 
@@ -221,8 +238,7 @@
 // Returns the offset of the first reference to a member offset.
 static ErrorOr<unsigned>
 writeSymbolTable(raw_fd_ostream &Out, object::Archive::Kind Kind,
-                 ArrayRef<NewArchiveIterator> Members,
-                 ArrayRef<MemoryBufferRef> Buffers,
+                 ArrayRef<NewArchiveMember> Members,
                  std::vector<unsigned> &MemberOffsetRefs, bool Deterministic) {
   unsigned HeaderStartOffset = 0;
   unsigned BodyStartOffset = 0;
@@ -230,7 +246,7 @@
   raw_svector_ostream NameOS(NameBuf);
   LLVMContext Context;
   for (unsigned MemberNum = 0, N = Members.size(); MemberNum < N; ++MemberNum) {
-    MemoryBufferRef MemberBuffer = Buffers[MemberNum];
+    MemoryBufferRef MemberBuffer = Members[MemberNum].Buf->getMemBufferRef();
     Expected<std::unique_ptr<object::SymbolicFile>> ObjOrErr =
         object::SymbolicFile::createSymbolicFile(
             MemberBuffer, sys::fs::file_magic::unknown, &Context);
@@ -305,7 +321,7 @@
 
 std::pair<StringRef, std::error_code>
 llvm::writeArchive(StringRef ArcName,
-                   std::vector<NewArchiveIterator> &NewMembers,
+                   std::vector<NewArchiveMember> &NewMembers,
                    bool WriteSymtab, object::Archive::Kind Kind,
                    bool Deterministic, bool Thin,
                    std::unique_ptr<MemoryBuffer> OldArchiveBuf) {
@@ -330,43 +346,10 @@
   std::vector<MemoryBufferRef> Members;
   std::vector<sys::fs::file_status> NewMemberStatus;
 
-  for (NewArchiveIterator &Member : NewMembers) {
-    MemoryBufferRef MemberRef;
-
-    if (Member.isNewMember()) {
-      StringRef Filename = Member.getNew();
-      NewMemberStatus.resize(NewMemberStatus.size() + 1);
-      sys::fs::file_status &Status = NewMemberStatus.back();
-      ErrorOr<int> FD = Member.getFD(Status);
-      if (auto EC = FD.getError())
-        return std::make_pair(Filename, EC);
-      ErrorOr<std::unique_ptr<MemoryBuffer>> MemberBufferOrErr =
-          MemoryBuffer::getOpenFile(FD.get(), Filename, Status.getSize(),
-                                    false);
-      if (auto EC = MemberBufferOrErr.getError())
-        return std::make_pair(Filename, EC);
-      if (close(FD.get()) != 0)
-        return std::make_pair(Filename,
-                              std::error_code(errno, std::generic_category()));
-      Buffers.push_back(std::move(MemberBufferOrErr.get()));
-      MemberRef = Buffers.back()->getMemBufferRef();
-    } else {
-      const object::Archive::Child &OldMember = Member.getOld();
-      assert((!Thin || OldMember.getParent()->isThin()) &&
-             "Thin archives cannot refers to member of other archives");
-      ErrorOr<MemoryBufferRef> MemberBufferOrErr =
-          OldMember.getMemoryBufferRef();
-      if (auto EC = MemberBufferOrErr.getError())
-        return std::make_pair("", EC);
-      MemberRef = MemberBufferOrErr.get();
-    }
-    Members.push_back(MemberRef);
-  }
-
   unsigned MemberReferenceOffset = 0;
   if (WriteSymtab) {
     ErrorOr<unsigned> MemberReferenceOffsetOrErr = writeSymbolTable(
-        Out, Kind, NewMembers, Members, MemberOffsetRefs, Deterministic);
+        Out, Kind, NewMembers, MemberOffsetRefs, Deterministic);
     if (auto EC = MemberReferenceOffsetOrErr.getError())
       return std::make_pair(ArcName, EC);
     MemberReferenceOffset = MemberReferenceOffsetOrErr.get();
@@ -376,55 +359,18 @@
   if (Kind != object::Archive::K_BSD)
     writeStringTable(Out, ArcName, NewMembers, StringMapIndexes, Thin);
 
-  unsigned MemberNum = 0;
-  unsigned NewMemberNum = 0;
   std::vector<unsigned>::iterator StringMapIndexIter = StringMapIndexes.begin();
   std::vector<unsigned> MemberOffset;
-  for (const NewArchiveIterator &I : NewMembers) {
-    MemoryBufferRef File = Members[MemberNum++];
+  for (const NewArchiveMember &M : NewMembers) {
+    MemoryBufferRef File = M.Buf->getMemBufferRef();
 
     unsigned Pos = Out.tell();
     MemberOffset.push_back(Pos);
 
-    sys::TimeValue ModTime;
-    unsigned UID;
-    unsigned GID;
-    unsigned Perms;
-    if (Deterministic) {
-      ModTime.fromEpochTime(0);
-      UID = 0;
-      GID = 0;
-      Perms = 0644;
-    } else if (I.isNewMember()) {
-      const sys::fs::file_status &Status = NewMemberStatus[NewMemberNum];
-      ModTime = Status.getLastModificationTime();
-      UID = Status.getUser();
-      GID = Status.getGroup();
-      Perms = Status.permissions();
-    } else {
-      const object::Archive::Child &OldMember = I.getOld();
-      ModTime = OldMember.getLastModified();
-      UID = OldMember.getUID();
-      GID = OldMember.getGID();
-      Perms = OldMember.getAccessMode();
-    }
-
-    if (I.isNewMember()) {
-      StringRef FileName = I.getNew();
-      const sys::fs::file_status &Status = NewMemberStatus[NewMemberNum++];
-      printMemberHeader(Out, Kind, Thin, sys::path::filename(FileName),
-                        StringMapIndexIter, ModTime, UID, GID, Perms,
-                        Status.getSize());
-    } else {
-      const object::Archive::Child &OldMember = I.getOld();
-      ErrorOr<uint32_t> Size = OldMember.getSize();
-      if (std::error_code EC = Size.getError())
-        return std::make_pair("", EC);
-      StringRef FileName = I.getName();
-      printMemberHeader(Out, Kind, Thin, sys::path::filename(FileName),
-                        StringMapIndexIter, ModTime, UID, GID, Perms,
-                        Size.get());
-    }
+    printMemberHeader(Out, Kind, Thin,
+                      sys::path::filename(M.Buf->getBufferIdentifier()),
+                      StringMapIndexIter, M.ModTime, M.UID, M.GID, M.Perms,
+                      M.Buf->getBufferSize());
 
     if (!Thin)
       Out << File.getBuffer();