diff --git a/llvm/tools/dsymutil/DwarfStreamer.h b/llvm/include/llvm/DWARFLinker/DWARFStreamer.h
rename from llvm/tools/dsymutil/DwarfStreamer.h
rename to llvm/include/llvm/DWARFLinker/DWARFStreamer.h
--- a/llvm/tools/dsymutil/DwarfStreamer.h
+++ b/llvm/include/llvm/DWARFLinker/DWARFStreamer.h
@@ -1,4 +1,4 @@
-//===- tools/dsymutil/DwarfStreamer.h - Dwarf Streamer ----------*- C++ -*-===//
+//===- DwarfStreamer.h ------------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -6,11 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_TOOLS_DSYMUTIL_DWARFSTREAMER_H
-#define LLVM_TOOLS_DSYMUTIL_DWARFSTREAMER_H
+#ifndef LLVM_DWARFLINKER_DWARFSTREAMER_H
+#define LLVM_DWARFLINKER_DWARFSTREAMER_H
 
-#include "DebugMap.h"
-#include "LinkUtils.h"
 #include "llvm/CodeGen/AccelTable.h"
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/NonRelocatableStringpool.h"
@@ -36,7 +34,19 @@
 #include "llvm/Target/TargetOptions.h"
 
 namespace llvm {
-namespace dsymutil {
+
+enum class OutputFileType {
+  Object,
+  Assembly,
+};
+
+///   User of DwarfStreamer should call initialization code
+///   for AsmPrinter:
+///
+///   InitializeAllTargetInfos();
+///   InitializeAllTargetMCs();
+///   InitializeAllTargets();
+///   InitializeAllAsmPrinters();
 
 /// The Dwarf streaming logic.
 ///
@@ -44,13 +54,16 @@
 /// information binary representation are handled in this class.
 class DwarfStreamer : public DwarfEmitter {
 public:
-  DwarfStreamer(raw_fd_ostream &OutFile, LinkOptions Options)
-      : OutFile(OutFile), Options(std::move(Options)) {}
+  DwarfStreamer(OutputFileType OutFileType, raw_pwrite_stream &OutFile,
+                std::function<StringRef(StringRef Input)> Translator,
+                bool Minimize, messageHandler Error, messageHandler Warning)
+      : OutFile(OutFile), OutFileType(OutFileType), Translator(Translator),
+        Minimize(Minimize), ErrorHandler(Error), WarningHandler(Warning) {}
 
   bool init(Triple TheTriple);
 
   /// Dump the file to the disk.
-  bool finish(const DebugMap &, SymbolMapTranslator &T);
+  void finish();
 
   AsmPrinter &getAsmPrinter() const { return *Asm; }
 
@@ -158,6 +171,16 @@
   }
 
 private:
+  inline void error(const Twine &Error, StringRef Context = "") {
+    if (ErrorHandler)
+      ErrorHandler(Error, Context, nullptr);
+  }
+
+  inline void warn(const Twine &Warning, StringRef Context = "") {
+    if (WarningHandler)
+      WarningHandler(Warning, Context, nullptr);
+  }
+
   /// \defgroup MCObjects MC layer objects constructed by the streamer
   /// @{
   std::unique_ptr<MCRegisterInfo> MRI;
@@ -174,10 +197,11 @@
   std::unique_ptr<AsmPrinter> Asm;
   /// @}
 
-  /// The file we stream the linked Dwarf to.
-  raw_fd_ostream &OutFile;
-
-  LinkOptions Options;
+  /// The output file we stream the linked Dwarf to.
+  raw_pwrite_stream &OutFile;
+  OutputFileType OutFileType = OutputFileType::Object;
+  std::function<StringRef(StringRef Input)> Translator;
+  bool Minimize = true;
 
   uint64_t RangesSectionSize = 0;
   uint64_t LocSectionSize = 0;
@@ -197,9 +221,11 @@
   void emitPubSectionForUnit(MCSection *Sec, StringRef Name,
                              const CompileUnit &Unit,
                              const std::vector<CompileUnit::AccelInfo> &Names);
+
+  messageHandler ErrorHandler = nullptr;
+  messageHandler WarningHandler = nullptr;
 };
 
-} // end namespace dsymutil
 } // end namespace llvm
 
-#endif // LLVM_TOOLS_DSYMUTIL_DWARFSTREAMER_H
+#endif // LLVM_DWARFLINKER_DWARFSTREAMER_H
diff --git a/llvm/lib/DWARFLinker/CMakeLists.txt b/llvm/lib/DWARFLinker/CMakeLists.txt
--- a/llvm/lib/DWARFLinker/CMakeLists.txt
+++ b/llvm/lib/DWARFLinker/CMakeLists.txt
@@ -2,6 +2,7 @@
   DWARFLinkerCompileUnit.cpp
   DWARFLinkerDeclContext.cpp
   DWARFLinker.cpp
+  DWARFStreamer.cpp
 
   DEPENDS
   intrinsics_gen
diff --git a/llvm/tools/dsymutil/DwarfStreamer.cpp b/llvm/lib/DWARFLinker/DWARFStreamer.cpp
rename from llvm/tools/dsymutil/DwarfStreamer.cpp
rename to llvm/lib/DWARFLinker/DWARFStreamer.cpp
--- a/llvm/tools/dsymutil/DwarfStreamer.cpp
+++ b/llvm/lib/DWARFLinker/DWARFStreamer.cpp
@@ -1,4 +1,4 @@
-//===- tools/dsymutil/DwarfStreamer.cpp - Dwarf Streamer ------------------===//
+//===- DwarfStreamer.cpp --------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -6,9 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "DwarfStreamer.h"
-#include "LinkUtils.h"
-#include "MachOUtils.h"
+#include "llvm/DWARFLinker/DWARFStreamer.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/DWARFLinker/DWARFLinkerCompileUnit.h"
 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
@@ -23,8 +21,6 @@
 
 static mc::RegisterMCTargetOptionsFlags MOF;
 
-namespace dsymutil {
-
 bool DwarfStreamer::init(Triple TheTriple) {
   std::string ErrorStr;
   std::string TripleName;
@@ -34,18 +30,19 @@
   const Target *TheTarget =
       TargetRegistry::lookupTarget(TripleName, TheTriple, ErrorStr);
   if (!TheTarget)
-    return error(ErrorStr, Context);
+    return error(ErrorStr, Context), false;
   TripleName = TheTriple.getTriple();
 
   // Create all the MC Objects.
   MRI.reset(TheTarget->createMCRegInfo(TripleName));
   if (!MRI)
-    return error(Twine("no register info for target ") + TripleName, Context);
+    return error(Twine("no register info for target ") + TripleName, Context),
+           false;
 
   MCTargetOptions MCOptions = mc::InitMCTargetOptionsFromFlags();
   MAI.reset(TheTarget->createMCAsmInfo(*MRI, TripleName, MCOptions));
   if (!MAI)
-    return error("no asm info for target " + TripleName, Context);
+    return error("no asm info for target " + TripleName, Context), false;
 
   MOFI.reset(new MCObjectFileInfo);
   MC.reset(new MCContext(MAI.get(), MRI.get(), MOFI.get()));
@@ -53,21 +50,21 @@
 
   MSTI.reset(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
   if (!MSTI)
-    return error("no subtarget info for target " + TripleName, Context);
+    return error("no subtarget info for target " + TripleName, Context), false;
 
   MAB = TheTarget->createMCAsmBackend(*MSTI, *MRI, MCOptions);
   if (!MAB)
-    return error("no asm backend for target " + TripleName, Context);
+    return error("no asm backend for target " + TripleName, Context), false;
 
   MII.reset(TheTarget->createMCInstrInfo());
   if (!MII)
-    return error("no instr info info for target " + TripleName, Context);
+    return error("no instr info info for target " + TripleName, Context), false;
 
   MCE = TheTarget->createMCCodeEmitter(*MII, *MRI, *MC);
   if (!MCE)
-    return error("no code emitter for target " + TripleName, Context);
+    return error("no code emitter for target " + TripleName, Context), false;
 
-  switch (Options.FileType) {
+  switch (OutFileType) {
   case OutputFileType::Assembly: {
     MIP = TheTarget->createMCInstPrinter(TheTriple, MAI->getAssemblerDialect(),
                                          *MAI, *MII, *MRI);
@@ -88,17 +85,17 @@
   }
 
   if (!MS)
-    return error("no object streamer for target " + TripleName, Context);
+    return error("no object streamer for target " + TripleName, Context), false;
 
   // Finally create the AsmPrinter we'll use to emit the DIEs.
   TM.reset(TheTarget->createTargetMachine(TripleName, "", "", TargetOptions(),
                                           None));
   if (!TM)
-    return error("no target machine for target " + TripleName, Context);
+    return error("no target machine for target " + TripleName, Context), false;
 
   Asm.reset(TheTarget->createAsmPrinter(*TM, std::unique_ptr<MCStreamer>(MS)));
   if (!Asm)
-    return error("no asm printer for target " + TripleName, Context);
+    return error("no asm printer for target " + TripleName, Context), false;
 
   RangesSectionSize = 0;
   LocSectionSize = 0;
@@ -109,15 +106,7 @@
   return true;
 }
 
-bool DwarfStreamer::finish(const DebugMap &DM, SymbolMapTranslator &T) {
-  bool Result = true;
-  if (DM.getTriple().isOSDarwin() && !DM.getBinaryPath().empty() &&
-      Options.FileType == OutputFileType::Object)
-    Result = MachOUtils::generateDsymCompanion(DM, T, *MS, OutFile);
-  else
-    MS->Finish();
-  return Result;
-}
+void DwarfStreamer::finish() { MS->Finish(); }
 
 void DwarfStreamer::switchToDebugInfoSection(unsigned DwarfVersion) {
   MS->SwitchSection(MOFI->getDwarfInfoSection());
@@ -660,7 +649,7 @@
     if (Dir[0] == 0)
       break;
 
-    StringRef Translated = Options.Translator(Dir);
+    StringRef Translated = Translator(Dir);
     Asm->OutStreamer->emitBytes(Translated);
     Asm->emitInt8(0);
     LineSectionSize += Translated.size() + 1;
@@ -672,7 +661,7 @@
     if (File[0] == 0)
       break;
 
-    StringRef Translated = Options.Translator(File);
+    StringRef Translated = Translator(File);
     Asm->OutStreamer->emitBytes(Translated);
     Asm->emitInt8(0);
     LineSectionSize += Translated.size() + 1;
@@ -740,7 +729,7 @@
 
 /// Emit .debug_pubnames for \p Unit.
 void DwarfStreamer::emitPubNamesForUnit(const CompileUnit &Unit) {
-  if (Options.Minimize)
+  if (Minimize)
     return;
   emitPubSectionForUnit(MC->getObjectFileInfo()->getDwarfPubNamesSection(),
                         "names", Unit, Unit.getPubnames());
@@ -748,7 +737,7 @@
 
 /// Emit .debug_pubtypes for \p Unit.
 void DwarfStreamer::emitPubTypesForUnit(const CompileUnit &Unit) {
-  if (Options.Minimize)
+  if (Minimize)
     return;
   emitPubSectionForUnit(MC->getObjectFileInfo()->getDwarfPubTypesSection(),
                         "types", Unit, Unit.getPubtypes());
@@ -776,5 +765,4 @@
   FrameSectionSize += FDEBytes.size() + 8 + AddrSize;
 }
 
-} // namespace dsymutil
 } // namespace llvm
diff --git a/llvm/lib/DWARFLinker/LLVMBuild.txt b/llvm/lib/DWARFLinker/LLVMBuild.txt
--- a/llvm/lib/DWARFLinker/LLVMBuild.txt
+++ b/llvm/lib/DWARFLinker/LLVMBuild.txt
@@ -18,4 +18,4 @@
 type = Library
 name = DWARFLinker
 parent = Libraries
-required_libraries = DebugInfoDWARF AsmPrinter CodeGen MC Object Support
+required_libraries = DebugInfoDWARF AsmPrinter CodeGen MC Object Support 
diff --git a/llvm/tools/dsymutil/CMakeLists.txt b/llvm/tools/dsymutil/CMakeLists.txt
--- a/llvm/tools/dsymutil/CMakeLists.txt
+++ b/llvm/tools/dsymutil/CMakeLists.txt
@@ -24,7 +24,6 @@
   CFBundle.cpp
   DebugMap.cpp
   DwarfLinkerForBinary.cpp
-  DwarfStreamer.cpp
   MachODebugMapParser.cpp
   MachOUtils.cpp
   SymbolMap.cpp
diff --git a/llvm/tools/dsymutil/DwarfLinkerForBinary.h b/llvm/tools/dsymutil/DwarfLinkerForBinary.h
--- a/llvm/tools/dsymutil/DwarfLinkerForBinary.h
+++ b/llvm/tools/dsymutil/DwarfLinkerForBinary.h
@@ -11,11 +11,11 @@
 
 #include "BinaryHolder.h"
 #include "DebugMap.h"
-#include "DwarfStreamer.h"
 #include "LinkUtils.h"
 #include "llvm/DWARFLinker/DWARFLinker.h"
 #include "llvm/DWARFLinker/DWARFLinkerCompileUnit.h"
 #include "llvm/DWARFLinker/DWARFLinkerDeclContext.h"
+#include "llvm/DWARFLinker/DWARFStreamer.h"
 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
 #include "llvm/Remarks/RemarkFormat.h"
 #include "llvm/Remarks/RemarkLinker.h"
diff --git a/llvm/tools/dsymutil/DwarfLinkerForBinary.cpp b/llvm/tools/dsymutil/DwarfLinkerForBinary.cpp
--- a/llvm/tools/dsymutil/DwarfLinkerForBinary.cpp
+++ b/llvm/tools/dsymutil/DwarfLinkerForBinary.cpp
@@ -9,7 +9,6 @@
 #include "DwarfLinkerForBinary.h"
 #include "BinaryHolder.h"
 #include "DebugMap.h"
-#include "DwarfStreamer.h"
 #include "MachOUtils.h"
 #include "dsymutil.h"
 #include "llvm/ADT/ArrayRef.h"
@@ -163,7 +162,14 @@
   if (Options.NoOutput)
     return true;
 
-  Streamer = std::make_unique<DwarfStreamer>(OutFile, Options);
+  Streamer = std::make_unique<DwarfStreamer>(
+      Options.FileType, OutFile, Options.Translator, Options.Minimize,
+      [&](const Twine &Error, StringRef Context, const DWARFDie *) {
+        error(Error, Context);
+      },
+      [&](const Twine &Warning, StringRef Context, const DWARFDie *) {
+        warn(Warning, Context);
+      });
   return Streamer->init(TheTriple);
 }
 
@@ -318,7 +324,7 @@
         reportWarning(Warning, Context, DIE);
       });
   GeneralLinker.setErrorHandler(
-      [&](const Twine &Error, StringRef Context, const DWARFDie *DIE) {
+      [&](const Twine &Error, StringRef Context, const DWARFDie *) {
         error(Error, Context);
       });
   GeneralLinker.setObjFileLoader(
@@ -442,7 +448,13 @@
       return error(toString(std::move(E)));
   }
 
-  return Streamer->finish(Map, Options.Translator);
+  if (Map.getTriple().isOSDarwin() && !Map.getBinaryPath().empty() &&
+      Options.FileType == OutputFileType::Object)
+    return MachOUtils::generateDsymCompanion(
+        Map, Options.Translator, *Streamer->getAsmPrinter().OutStreamer,
+        OutFile);
+  else
+    return Streamer->finish(), true;
 }
 
 static bool isMachOPairedReloc(uint64_t RelocType, uint64_t Arch) {
diff --git a/llvm/tools/dsymutil/LinkUtils.h b/llvm/tools/dsymutil/LinkUtils.h
--- a/llvm/tools/dsymutil/LinkUtils.h
+++ b/llvm/tools/dsymutil/LinkUtils.h
@@ -16,16 +16,12 @@
 #include "llvm/Support/WithColor.h"
 
 #include "llvm/DWARFLinker/DWARFLinker.h"
+#include "llvm/DWARFLinker/DWARFStreamer.h"
 #include <string>
 
 namespace llvm {
 namespace dsymutil {
 
-enum class OutputFileType {
-  Object,
-  Assembly,
-};
-
 struct LinkOptions {
   /// Verbosity
   bool Verbose = false;