--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lld/MachO/Dwarf.cpp	Tue Jun 08 06:07:14 2021 +0900
@@ -0,0 +1,43 @@
+//===- DWARF.cpp ----------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "Dwarf.h"
+#include "InputFiles.h"
+#include "InputSection.h"
+#include "OutputSegment.h"
+
+#include <memory>
+
+using namespace lld;
+using namespace lld::macho;
+using namespace llvm;
+
+std::unique_ptr<DwarfObject> DwarfObject::create(ObjFile *obj) {
+  auto dObj = std::make_unique<DwarfObject>();
+  bool hasDwarfInfo = false;
+  // LLD only needs to extract the source file path from the debug info, so we
+  // initialize DwarfObject with just the sections necessary to get that path.
+  // The debugger will locate the debug info via the object file paths that we
+  // emit in our STABS symbols, so we don't need to process & emit them
+  // ourselves.
+  for (const InputSection *isec : obj->debugSections) {
+    if (StringRef *s =
+            StringSwitch<StringRef *>(isec->name)
+                .Case(section_names::debugInfo, &dObj->infoSection.Data)
+                .Case(section_names::debugAbbrev, &dObj->abbrevSection)
+                .Case(section_names::debugStr, &dObj->strSection)
+                .Default(nullptr)) {
+      *s = toStringRef(isec->data);
+      hasDwarfInfo = true;
+    }
+  }
+
+  if (hasDwarfInfo)
+    return dObj;
+  return nullptr;
+}