--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/llvm-objcopy/llvm-objcopy.cpp	Fri Nov 17 20:32:31 2017 +0900
@@ -0,0 +1,132 @@
+//===- llvm-objcopy.cpp -----------------------------------------*- C++ -*-===//
+//
+//                      The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#include "llvm-objcopy.h"
+#include "Object.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileOutputBuffer.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/ToolOutputFile.h"
+
+#include <memory>
+#include <string>
+#include <system_error>
+
+using namespace llvm;
+using namespace object;
+using namespace ELF;
+
+// The name this program was invoked as.
+static StringRef ToolName;
+
+namespace llvm {
+
+LLVM_ATTRIBUTE_NORETURN void error(Twine Message) {
+  errs() << ToolName << ": " << Message << ".\n";
+  errs().flush();
+  exit(1);
+}
+
+LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, std::error_code EC) {
+  assert(EC);
+  errs() << ToolName << ": '" << File << "': " << EC.message() << ".\n";
+  exit(1);
+}
+
+LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, llvm::Error E) {
+  assert(E);
+  std::string Buf;
+  raw_string_ostream OS(Buf);
+  logAllUnhandledErrors(std::move(E), OS, "");
+  OS.flush();
+  errs() << ToolName << ": '" << File << "': " << Buf;
+  exit(1);
+}
+}
+
+cl::opt<std::string> InputFilename(cl::Positional, cl::desc("<input>"));
+cl::opt<std::string> OutputFilename(cl::Positional, cl::desc("<output>"),
+                                    cl::init("-"));
+cl::opt<std::string>
+    OutputFormat("O", cl::desc("set output format to one of the following:"
+                               "\n\tbinary"));
+cl::list<std::string> ToRemove("remove-section",
+                               cl::desc("Remove a specific section"));
+cl::alias ToRemoveA("R", cl::desc("Alias for remove-section"),
+                    cl::aliasopt(ToRemove));
+cl::opt<bool> StripSections("strip-sections",
+                            cl::desc("Remove all section headers"));
+
+typedef std::function<bool(const SectionBase &Sec)> SectionPred;
+
+void CopyBinary(const ELFObjectFile<ELF64LE> &ObjFile) {
+  std::unique_ptr<FileOutputBuffer> Buffer;
+  std::unique_ptr<Object<ELF64LE>> Obj;
+  if (!OutputFormat.empty() && OutputFormat != "binary")
+    error("invalid output format '" + OutputFormat + "'");
+  if (!OutputFormat.empty() && OutputFormat == "binary")
+    Obj = llvm::make_unique<BinaryObject<ELF64LE>>(ObjFile);
+  else
+    Obj = llvm::make_unique<ELFObject<ELF64LE>>(ObjFile);
+
+  SectionPred RemovePred = [](const SectionBase &) { return false; };
+
+  if (!ToRemove.empty()) {
+    RemovePred = [&](const SectionBase &Sec) {
+      return std::find(std::begin(ToRemove), std::end(ToRemove), Sec.Name) !=
+             std::end(ToRemove);
+    };
+  }
+
+  if (StripSections) {
+    RemovePred = [RemovePred](const SectionBase &Sec) {
+      return RemovePred(Sec) || (Sec.Flags & SHF_ALLOC) == 0;
+    };
+    Obj->WriteSectionHeaders = false;
+  }
+
+  Obj->removeSections(RemovePred);
+
+  Obj->finalize();
+  ErrorOr<std::unique_ptr<FileOutputBuffer>> BufferOrErr =
+      FileOutputBuffer::create(OutputFilename, Obj->totalSize(),
+                               FileOutputBuffer::F_executable);
+  if (BufferOrErr.getError())
+    error("failed to open " + OutputFilename);
+  else
+    Buffer = std::move(*BufferOrErr);
+  std::error_code EC;
+  if (EC)
+    report_fatal_error(EC.message());
+  Obj->write(*Buffer);
+  if (auto EC = Buffer->commit())
+    reportError(OutputFilename, EC);
+}
+
+int main(int argc, char **argv) {
+  // Print a stack trace if we signal out.
+  sys::PrintStackTraceOnErrorSignal(argv[0]);
+  PrettyStackTraceProgram X(argc, argv);
+  llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
+  cl::ParseCommandLineOptions(argc, argv, "llvm objcopy utility\n");
+  ToolName = argv[0];
+  if (InputFilename.empty()) {
+    cl::PrintHelpMessage();
+    return 2;
+  }
+  Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(InputFilename);
+  if (!BinaryOrErr)
+    reportError(InputFilename, BinaryOrErr.takeError());
+  Binary &Binary = *BinaryOrErr.get().getBinary();
+  if (ELFObjectFile<ELF64LE> *o = dyn_cast<ELFObjectFile<ELF64LE>>(&Binary)) {
+    CopyBinary(*o);
+    return 0;
+  }
+  reportError(InputFilename, object_error::invalid_file_type);
+}