llvm/tools/llvm-objcopy/llvm-objcopy.cpp - third_party/llvm-project - Git at Google

 //===- llvm-objcopy.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 "llvm-objcopy.h"
 #include "Buffer.h"
 #include "COFF/COFFObjcopy.h"
 #include "CopyConfig.h"
 #include "ELF/ELFObjcopy.h"
 #include "MachO/MachOObjcopy.h"
 #include "wasm/WasmObjcopy.h"

 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Object/Archive.h"
 #include "llvm/Object/ArchiveWriter.h"
 #include "llvm/Object/Binary.h"
 #include "llvm/Object/COFF.h"
 #include "llvm/Object/ELFObjectFile.h"
 #include "llvm/Object/ELFTypes.h"
 #include "llvm/Object/Error.h"
 #include "llvm/Object/MachO.h"
 #include "llvm/Object/Wasm.h"
 #include "llvm/Option/Arg.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Option/Option.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/Memory.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/StringSaver.h"
 #include "llvm/Support/WithColor.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cassert>
 #include <cstdlib>
 #include <memory>
 #include <string>
 #include <system_error>
 #include <utility>

 namespace llvm {
 namespace objcopy {

 // The name this program was invoked as.
 StringRef ToolName;

 LLVM_ATTRIBUTE_NORETURN void error(Twine Message) {
   WithColor::error(errs(), ToolName) << Message << "\n";
   exit(1);
 }

 LLVM_ATTRIBUTE_NORETURN void error(Error E) {
   assert(E);
   std::string Buf;
   raw_string_ostream OS(Buf);
   logAllUnhandledErrors(std::move(E), OS);
   OS.flush();
   WithColor::error(errs(), ToolName) << Buf;
   exit(1);
 }

 LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, std::error_code EC) {
   assert(EC);
   error(createFileError(File, EC));
 }

 LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, Error E) {
   assert(E);
   std::string Buf;
   raw_string_ostream OS(Buf);
   logAllUnhandledErrors(std::move(E), OS);
   OS.flush();
   WithColor::error(errs(), ToolName) << "'" << File << "': " << Buf;
   exit(1);
 }

 ErrorSuccess reportWarning(Error E) {
   assert(E);
   WithColor::warning(errs(), ToolName) << toString(std::move(E)) << '\n';
   return Error::success();
 }

 } // end namespace objcopy
 } // end namespace llvm

 using namespace llvm;
 using namespace llvm::object;
 using namespace llvm::objcopy;

 // For regular archives this function simply calls llvm::writeArchive,
 // For thin archives it writes the archive file itself as well as its members.
 static Error deepWriteArchive(StringRef ArcName,
                               ArrayRef<NewArchiveMember> NewMembers,
                               bool WriteSymtab, object::Archive::Kind Kind,
                               bool Deterministic, bool Thin) {
   if (Error E = writeArchive(ArcName, NewMembers, WriteSymtab, Kind,
                              Deterministic, Thin))
     return createFileError(ArcName, std::move(E));

   if (!Thin)
     return Error::success();

   for (const NewArchiveMember &Member : NewMembers) {
     // Internally, FileBuffer will use the buffer created by
     // FileOutputBuffer::create, for regular files (that is the case for
     // deepWriteArchive) FileOutputBuffer::create will return OnDiskBuffer.
     // OnDiskBuffer uses a temporary file and then renames it. So in reality
     // there is no inefficiency / duplicated in-memory buffers in this case. For
     // now in-memory buffers can not be completely avoided since
     // NewArchiveMember still requires them even though writeArchive does not
     // write them on disk.
     FileBuffer FB(Member.MemberName);
     if (Error E = FB.allocate(Member.Buf->getBufferSize()))
       return E;
     std::copy(Member.Buf->getBufferStart(), Member.Buf->getBufferEnd(),
               FB.getBufferStart());
     if (Error E = FB.commit())
       return E;
   }
   return Error::success();
 }

 /// The function executeObjcopyOnIHex does the dispatch based on the format
 /// of the output specified by the command line options.
 static Error executeObjcopyOnIHex(CopyConfig &Config, MemoryBuffer &In,
                                   Buffer &Out) {
   // TODO: support output formats other than ELF.
   if (Error E = Config.parseELFConfig())
     return E;
   return elf::executeObjcopyOnIHex(Config, In, Out);
 }

 /// The function executeObjcopyOnRawBinary does the dispatch based on the format
 /// of the output specified by the command line options.
 static Error executeObjcopyOnRawBinary(CopyConfig &Config, MemoryBuffer &In,
                                        Buffer &Out) {
   switch (Config.OutputFormat) {
   case FileFormat::ELF:
   // FIXME: Currently, we call elf::executeObjcopyOnRawBinary even if the
   // output format is binary/ihex or it's not given. This behavior differs from
   // GNU objcopy. See https://bugs.llvm.org/show_bug.cgi?id=42171 for details.
   case FileFormat::Binary:
   case FileFormat::IHex:
   case FileFormat::Unspecified:
     if (Error E = Config.parseELFConfig())
       return E;
     return elf::executeObjcopyOnRawBinary(Config, In, Out);
   }

   llvm_unreachable("unsupported output format");
 }

 /// The function executeObjcopyOnBinary does the dispatch based on the format
 /// of the input binary (ELF, MachO or COFF).
 static Error executeObjcopyOnBinary(CopyConfig &Config, object::Binary &In,
                                     Buffer &Out) {
   if (auto *ELFBinary = dyn_cast<object::ELFObjectFileBase>(&In)) {
     if (Error E = Config.parseELFConfig())
       return E;
     return elf::executeObjcopyOnBinary(Config, *ELFBinary, Out);
   } else if (auto *COFFBinary = dyn_cast<object::COFFObjectFile>(&In))
     return coff::executeObjcopyOnBinary(Config, *COFFBinary, Out);
   else if (auto *MachOBinary = dyn_cast<object::MachOObjectFile>(&In))
     return macho::executeObjcopyOnBinary(Config, *MachOBinary, Out);
   else if (auto *WasmBinary = dyn_cast<object::WasmObjectFile>(&In))
     return objcopy::wasm::executeObjcopyOnBinary(Config, *WasmBinary, Out);
   else
     return createStringError(object_error::invalid_file_type,
                              "unsupported object file format");
 }

 static Error executeObjcopyOnArchive(CopyConfig &Config, const Archive &Ar) {
   std::vector<NewArchiveMember> NewArchiveMembers;
   Error Err = Error::success();
   for (const Archive::Child &Child : Ar.children(Err)) {
     Expected<StringRef> ChildNameOrErr = Child.getName();
     if (!ChildNameOrErr)
       return createFileError(Ar.getFileName(), ChildNameOrErr.takeError());

     Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
     if (!ChildOrErr)
       return createFileError(Ar.getFileName() + "(" + *ChildNameOrErr + ")",
                              ChildOrErr.takeError());

     MemBuffer MB(ChildNameOrErr.get());
     if (Error E = executeObjcopyOnBinary(Config, *ChildOrErr->get(), MB))
       return E;

     Expected<NewArchiveMember> Member =
         NewArchiveMember::getOldMember(Child, Config.DeterministicArchives);
     if (!Member)
       return createFileError(Ar.getFileName(), Member.takeError());
     Member->Buf = MB.releaseMemoryBuffer();
     Member->MemberName = Member->Buf->getBufferIdentifier();
     NewArchiveMembers.push_back(std::move(*Member));
   }
   if (Err)
     return createFileError(Config.InputFilename, std::move(Err));

   return deepWriteArchive(Config.OutputFilename, NewArchiveMembers,
                           Ar.hasSymbolTable(), Ar.kind(),
                           Config.DeterministicArchives, Ar.isThin());
 }

 static Error restoreStatOnFile(StringRef Filename,
                                const sys::fs::file_status &Stat,
                                bool PreserveDates) {
   int FD;

   // Writing to stdout should not be treated as an error here, just
   // do not set access/modification times or permissions.
   if (Filename == "-")
     return Error::success();

   if (auto EC =
           sys::fs::openFileForWrite(Filename, FD, sys::fs::CD_OpenExisting))
     return createFileError(Filename, EC);

   if (PreserveDates)
     if (auto EC = sys::fs::setLastAccessAndModificationTime(
             FD, Stat.getLastAccessedTime(), Stat.getLastModificationTime()))
       return createFileError(Filename, EC);

   sys::fs::file_status OStat;
   if (std::error_code EC = sys::fs::status(FD, OStat))
     return createFileError(Filename, EC);
   if (OStat.type() == sys::fs::file_type::regular_file)
 #ifdef _WIN32
     if (auto EC = sys::fs::setPermissions(
             Filename, static_cast<sys::fs::perms>(Stat.permissions() &
                                                   ~sys::fs::getUmask())))
 #else
     if (auto EC = sys::fs::setPermissions(
             FD, static_cast<sys::fs::perms>(Stat.permissions() &
                                             ~sys::fs::getUmask())))
 #endif
       return createFileError(Filename, EC);

   if (auto EC = sys::Process::SafelyCloseFileDescriptor(FD))
     return createFileError(Filename, EC);

   return Error::success();
 }

 /// The function executeObjcopy does the higher level dispatch based on the type
 /// of input (raw binary, archive or single object file) and takes care of the
 /// format-agnostic modifications, i.e. preserving dates.
 static Error executeObjcopy(CopyConfig &Config) {
   sys::fs::file_status Stat;
   if (Config.InputFilename != "-") {
     if (auto EC = sys::fs::status(Config.InputFilename, Stat))
       return createFileError(Config.InputFilename, EC);
   } else {
     Stat.permissions(static_cast<sys::fs::perms>(0777));
   }

   using ProcessRawFn = Error (*)(CopyConfig &, MemoryBuffer &, Buffer &);
   ProcessRawFn ProcessRaw;
   switch (Config.InputFormat) {
   case FileFormat::Binary:
     ProcessRaw = executeObjcopyOnRawBinary;
     break;
   case FileFormat::IHex:
     ProcessRaw = executeObjcopyOnIHex;
     break;
   default:
     ProcessRaw = nullptr;
   }

   if (ProcessRaw) {
     auto BufOrErr = MemoryBuffer::getFileOrSTDIN(Config.InputFilename);
     if (!BufOrErr)
       return createFileError(Config.InputFilename, BufOrErr.getError());
     FileBuffer FB(Config.OutputFilename);
     if (Error E = ProcessRaw(Config, *BufOrErr->get(), FB))
       return E;
   } else {
     Expected<OwningBinary<llvm::object::Binary>> BinaryOrErr =
         createBinary(Config.InputFilename);
     if (!BinaryOrErr)
       return createFileError(Config.InputFilename, BinaryOrErr.takeError());

     if (Archive *Ar = dyn_cast<Archive>(BinaryOrErr.get().getBinary())) {
       if (Error E = executeObjcopyOnArchive(Config, *Ar))
         return E;
     } else {
       FileBuffer FB(Config.OutputFilename);
       if (Error E = executeObjcopyOnBinary(Config,
                                            *BinaryOrErr.get().getBinary(), FB))
         return E;
     }
   }

   if (Error E =
           restoreStatOnFile(Config.OutputFilename, Stat, Config.PreserveDates))
     return E;

   if (!Config.SplitDWO.empty()) {
     Stat.permissions(static_cast<sys::fs::perms>(0666));
     if (Error E =
             restoreStatOnFile(Config.SplitDWO, Stat, Config.PreserveDates))
       return E;
   }

   return Error::success();
 }

 namespace {

 enum class ToolType { Objcopy, Strip, InstallNameTool };

 } // anonymous namespace

 int main(int argc, char **argv) {
   InitLLVM X(argc, argv);
   ToolName = argv[0];

   StringRef Stem = sys::path::stem(ToolName);
   auto Is = [=](StringRef Tool) {
     // We need to recognize the following filenames:
     //
     // llvm-objcopy -> objcopy
     // strip-10.exe -> strip
     // powerpc64-unknown-freebsd13-objcopy -> objcopy
     // llvm-install-name-tool -> install-name-tool
     auto I = Stem.rfind_lower(Tool);
     return I != StringRef::npos &&
            (I + Tool.size() == Stem.size() || !isAlnum(Stem[I + Tool.size()]));
   };
   ToolType Tool = ToolType::Objcopy;
   if (Is("strip"))
     Tool = ToolType::Strip;
   else if (Is("install-name-tool") || Is("install_name_tool"))
     Tool = ToolType::InstallNameTool;

   // Expand response files.
   // TODO: Move these lines, which are copied from lib/Support/CommandLine.cpp,
   // into a separate function in the CommandLine library and call that function
   // here. This is duplicated code.
   SmallVector<const char *, 20> NewArgv(argv, argv + argc);
   BumpPtrAllocator A;
   StringSaver Saver(A);
   cl::ExpandResponseFiles(Saver,
                           Triple(sys::getProcessTriple()).isOSWindows()
                               ? cl::TokenizeWindowsCommandLine
                               : cl::TokenizeGNUCommandLine,
                           NewArgv);

   auto Args = makeArrayRef(NewArgv).drop_front();
   Expected<DriverConfig> DriverConfig =
       (Tool == ToolType::Strip) ? parseStripOptions(Args, reportWarning)
                                 : ((Tool == ToolType::InstallNameTool)
                                        ? parseInstallNameToolOptions(Args)
                                        : parseObjcopyOptions(Args, reportWarning));
   if (!DriverConfig) {
     logAllUnhandledErrors(DriverConfig.takeError(),
                           WithColor::error(errs(), ToolName));
     return 1;
   }
   for (CopyConfig &CopyConfig : DriverConfig->CopyConfigs) {
     if (Error E = executeObjcopy(CopyConfig)) {
       logAllUnhandledErrors(std::move(E), WithColor::error(errs(), ToolName));
       return 1;
     }
   }

   return 0;
 }
	//===- llvm-objcopy.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 "llvm-objcopy.h"
	#include "Buffer.h"
	#include "COFF/COFFObjcopy.h"
	#include "CopyConfig.h"
	#include "ELF/ELFObjcopy.h"
	#include "MachO/MachOObjcopy.h"
	#include "wasm/WasmObjcopy.h"

	#include "llvm/ADT/STLExtras.h"
	#include "llvm/ADT/SmallVector.h"
	#include "llvm/ADT/StringRef.h"
	#include "llvm/ADT/Twine.h"
	#include "llvm/Object/Archive.h"
	#include "llvm/Object/ArchiveWriter.h"
	#include "llvm/Object/Binary.h"
	#include "llvm/Object/COFF.h"
	#include "llvm/Object/ELFObjectFile.h"
	#include "llvm/Object/ELFTypes.h"
	#include "llvm/Object/Error.h"
	#include "llvm/Object/MachO.h"
	#include "llvm/Object/Wasm.h"
	#include "llvm/Option/Arg.h"
	#include "llvm/Option/ArgList.h"
	#include "llvm/Option/Option.h"
	#include "llvm/Support/Casting.h"
	#include "llvm/Support/CommandLine.h"
	#include "llvm/Support/Error.h"
	#include "llvm/Support/ErrorHandling.h"
	#include "llvm/Support/ErrorOr.h"
	#include "llvm/Support/Host.h"
	#include "llvm/Support/InitLLVM.h"
	#include "llvm/Support/Memory.h"
	#include "llvm/Support/Path.h"
	#include "llvm/Support/Process.h"
	#include "llvm/Support/StringSaver.h"
	#include "llvm/Support/WithColor.h"
	#include "llvm/Support/raw_ostream.h"
	#include <algorithm>
	#include <cassert>
	#include <cstdlib>
	#include <memory>
	#include <string>
	#include <system_error>
	#include <utility>

	namespace llvm {
	namespace objcopy {

	// The name this program was invoked as.
	StringRef ToolName;

	LLVM_ATTRIBUTE_NORETURN void error(Twine Message) {
	WithColor::error(errs(), ToolName) << Message << "\n";
	exit(1);
	}

	LLVM_ATTRIBUTE_NORETURN void error(Error E) {
	assert(E);
	std::string Buf;
	raw_string_ostream OS(Buf);
	logAllUnhandledErrors(std::move(E), OS);
	OS.flush();
	WithColor::error(errs(), ToolName) << Buf;
	exit(1);
	}

	LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, std::error_code EC) {
	assert(EC);
	error(createFileError(File, EC));
	}

	LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, Error E) {
	assert(E);
	std::string Buf;
	raw_string_ostream OS(Buf);
	logAllUnhandledErrors(std::move(E), OS);
	OS.flush();
	WithColor::error(errs(), ToolName) << "'" << File << "': " << Buf;
	exit(1);
	}

	ErrorSuccess reportWarning(Error E) {
	assert(E);
	WithColor::warning(errs(), ToolName) << toString(std::move(E)) << '\n';
	return Error::success();
	}

	} // end namespace objcopy
	} // end namespace llvm

	using namespace llvm;
	using namespace llvm::object;
	using namespace llvm::objcopy;

	// For regular archives this function simply calls llvm::writeArchive,
	// For thin archives it writes the archive file itself as well as its members.
	static Error deepWriteArchive(StringRef ArcName,
	ArrayRef<NewArchiveMember> NewMembers,
	bool WriteSymtab, object::Archive::Kind Kind,
	bool Deterministic, bool Thin) {
	if (Error E = writeArchive(ArcName, NewMembers, WriteSymtab, Kind,
	Deterministic, Thin))
	return createFileError(ArcName, std::move(E));

	if (!Thin)
	return Error::success();

	for (const NewArchiveMember &Member : NewMembers) {
	// Internally, FileBuffer will use the buffer created by
	// FileOutputBuffer::create, for regular files (that is the case for
	// deepWriteArchive) FileOutputBuffer::create will return OnDiskBuffer.
	// OnDiskBuffer uses a temporary file and then renames it. So in reality
	// there is no inefficiency / duplicated in-memory buffers in this case. For
	// now in-memory buffers can not be completely avoided since
	// NewArchiveMember still requires them even though writeArchive does not
	// write them on disk.
	FileBuffer FB(Member.MemberName);
	if (Error E = FB.allocate(Member.Buf->getBufferSize()))
	return E;
	std::copy(Member.Buf->getBufferStart(), Member.Buf->getBufferEnd(),
	FB.getBufferStart());
	if (Error E = FB.commit())
	return E;
	}
	return Error::success();
	}

	/// The function executeObjcopyOnIHex does the dispatch based on the format
	/// of the output specified by the command line options.
	static Error executeObjcopyOnIHex(CopyConfig &Config, MemoryBuffer &In,
	Buffer &Out) {
	// TODO: support output formats other than ELF.
	if (Error E = Config.parseELFConfig())
	return E;
	return elf::executeObjcopyOnIHex(Config, In, Out);
	}

	/// The function executeObjcopyOnRawBinary does the dispatch based on the format
	/// of the output specified by the command line options.
	static Error executeObjcopyOnRawBinary(CopyConfig &Config, MemoryBuffer &In,
	Buffer &Out) {
	switch (Config.OutputFormat) {
	case FileFormat::ELF:
	// FIXME: Currently, we call elf::executeObjcopyOnRawBinary even if the
	// output format is binary/ihex or it's not given. This behavior differs from
	// GNU objcopy. See https://bugs.llvm.org/show_bug.cgi?id=42171 for details.
	case FileFormat::Binary:
	case FileFormat::IHex:
	case FileFormat::Unspecified:
	if (Error E = Config.parseELFConfig())
	return E;
	return elf::executeObjcopyOnRawBinary(Config, In, Out);
	}

	llvm_unreachable("unsupported output format");
	}

	/// The function executeObjcopyOnBinary does the dispatch based on the format
	/// of the input binary (ELF, MachO or COFF).
	static Error executeObjcopyOnBinary(CopyConfig &Config, object::Binary &In,
	Buffer &Out) {
	if (auto *ELFBinary = dyn_cast<object::ELFObjectFileBase>(&In)) {
	if (Error E = Config.parseELFConfig())
	return E;
	return elf::executeObjcopyOnBinary(Config, *ELFBinary, Out);
	} else if (auto *COFFBinary = dyn_cast<object::COFFObjectFile>(&In))
	return coff::executeObjcopyOnBinary(Config, *COFFBinary, Out);
	else if (auto *MachOBinary = dyn_cast<object::MachOObjectFile>(&In))
	return macho::executeObjcopyOnBinary(Config, *MachOBinary, Out);
	else if (auto *WasmBinary = dyn_cast<object::WasmObjectFile>(&In))
	return objcopy::wasm::executeObjcopyOnBinary(Config, *WasmBinary, Out);
	else
	return createStringError(object_error::invalid_file_type,
	"unsupported object file format");
	}

	static Error executeObjcopyOnArchive(CopyConfig &Config, const Archive &Ar) {
	std::vector<NewArchiveMember> NewArchiveMembers;
	Error Err = Error::success();
	for (const Archive::Child &Child : Ar.children(Err)) {
	Expected<StringRef> ChildNameOrErr = Child.getName();
	if (!ChildNameOrErr)
	return createFileError(Ar.getFileName(), ChildNameOrErr.takeError());

	Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
	if (!ChildOrErr)
	return createFileError(Ar.getFileName() + "(" + *ChildNameOrErr + ")",
	ChildOrErr.takeError());

	MemBuffer MB(ChildNameOrErr.get());
	if (Error E = executeObjcopyOnBinary(Config, *ChildOrErr->get(), MB))
	return E;

	Expected<NewArchiveMember> Member =
	NewArchiveMember::getOldMember(Child, Config.DeterministicArchives);
	if (!Member)
	return createFileError(Ar.getFileName(), Member.takeError());
	Member->Buf = MB.releaseMemoryBuffer();
	Member->MemberName = Member->Buf->getBufferIdentifier();
	NewArchiveMembers.push_back(std::move(*Member));
	}
	if (Err)
	return createFileError(Config.InputFilename, std::move(Err));

	return deepWriteArchive(Config.OutputFilename, NewArchiveMembers,
	Ar.hasSymbolTable(), Ar.kind(),
	Config.DeterministicArchives, Ar.isThin());
	}

	static Error restoreStatOnFile(StringRef Filename,
	const sys::fs::file_status &Stat,
	bool PreserveDates) {
	int FD;

	// Writing to stdout should not be treated as an error here, just
	// do not set access/modification times or permissions.
	if (Filename == "-")
	return Error::success();

	if (auto EC =
	sys::fs::openFileForWrite(Filename, FD, sys::fs::CD_OpenExisting))
	return createFileError(Filename, EC);

	if (PreserveDates)
	if (auto EC = sys::fs::setLastAccessAndModificationTime(
	FD, Stat.getLastAccessedTime(), Stat.getLastModificationTime()))
	return createFileError(Filename, EC);

	sys::fs::file_status OStat;
	if (std::error_code EC = sys::fs::status(FD, OStat))
	return createFileError(Filename, EC);
	if (OStat.type() == sys::fs::file_type::regular_file)
	#ifdef _WIN32
	if (auto EC = sys::fs::setPermissions(
	Filename, static_cast<sys::fs::perms>(Stat.permissions() &
	~sys::fs::getUmask())))
	#else
	if (auto EC = sys::fs::setPermissions(
	FD, static_cast<sys::fs::perms>(Stat.permissions() &
	~sys::fs::getUmask())))
	#endif
	return createFileError(Filename, EC);

	if (auto EC = sys::Process::SafelyCloseFileDescriptor(FD))
	return createFileError(Filename, EC);

	return Error::success();
	}

	/// The function executeObjcopy does the higher level dispatch based on the type
	/// of input (raw binary, archive or single object file) and takes care of the
	/// format-agnostic modifications, i.e. preserving dates.
	static Error executeObjcopy(CopyConfig &Config) {
	sys::fs::file_status Stat;
	if (Config.InputFilename != "-") {
	if (auto EC = sys::fs::status(Config.InputFilename, Stat))
	return createFileError(Config.InputFilename, EC);
	} else {
	Stat.permissions(static_cast<sys::fs::perms>(0777));
	}

	using ProcessRawFn = Error (*)(CopyConfig &, MemoryBuffer &, Buffer &);
	ProcessRawFn ProcessRaw;
	switch (Config.InputFormat) {
	case FileFormat::Binary:
	ProcessRaw = executeObjcopyOnRawBinary;
	break;
	case FileFormat::IHex:
	ProcessRaw = executeObjcopyOnIHex;
	break;
	default:
	ProcessRaw = nullptr;
	}

	if (ProcessRaw) {
	auto BufOrErr = MemoryBuffer::getFileOrSTDIN(Config.InputFilename);
	if (!BufOrErr)
	return createFileError(Config.InputFilename, BufOrErr.getError());
	FileBuffer FB(Config.OutputFilename);
	if (Error E = ProcessRaw(Config, *BufOrErr->get(), FB))
	return E;
	} else {
	Expected<OwningBinary<llvm::object::Binary>> BinaryOrErr =
	createBinary(Config.InputFilename);
	if (!BinaryOrErr)
	return createFileError(Config.InputFilename, BinaryOrErr.takeError());

	if (Archive *Ar = dyn_cast<Archive>(BinaryOrErr.get().getBinary())) {
	if (Error E = executeObjcopyOnArchive(Config, *Ar))
	return E;
	} else {
	FileBuffer FB(Config.OutputFilename);
	if (Error E = executeObjcopyOnBinary(Config,
	*BinaryOrErr.get().getBinary(), FB))
	return E;
	}
	}

	if (Error E =
	restoreStatOnFile(Config.OutputFilename, Stat, Config.PreserveDates))
	return E;

	if (!Config.SplitDWO.empty()) {
	Stat.permissions(static_cast<sys::fs::perms>(0666));
	if (Error E =
	restoreStatOnFile(Config.SplitDWO, Stat, Config.PreserveDates))
	return E;
	}

	return Error::success();
	}

	namespace {

	enum class ToolType { Objcopy, Strip, InstallNameTool };

	} // anonymous namespace

	int main(int argc, char **argv) {
	InitLLVM X(argc, argv);
	ToolName = argv[0];

	StringRef Stem = sys::path::stem(ToolName);
	auto Is = [=](StringRef Tool) {
	// We need to recognize the following filenames:
	//
	// llvm-objcopy -> objcopy
	// strip-10.exe -> strip
	// powerpc64-unknown-freebsd13-objcopy -> objcopy
	// llvm-install-name-tool -> install-name-tool
	auto I = Stem.rfind_lower(Tool);
	return I != StringRef::npos &&
	(I + Tool.size() == Stem.size() \|\| !isAlnum(Stem[I + Tool.size()]));
	};
	ToolType Tool = ToolType::Objcopy;
	if (Is("strip"))
	Tool = ToolType::Strip;
	else if (Is("install-name-tool") \|\| Is("install_name_tool"))
	Tool = ToolType::InstallNameTool;

	// Expand response files.
	// TODO: Move these lines, which are copied from lib/Support/CommandLine.cpp,
	// into a separate function in the CommandLine library and call that function
	// here. This is duplicated code.
	SmallVector<const char *, 20> NewArgv(argv, argv + argc);
	BumpPtrAllocator A;
	StringSaver Saver(A);
	cl::ExpandResponseFiles(Saver,
	Triple(sys::getProcessTriple()).isOSWindows()
	? cl::TokenizeWindowsCommandLine
	: cl::TokenizeGNUCommandLine,
	NewArgv);

	auto Args = makeArrayRef(NewArgv).drop_front();
	Expected<DriverConfig> DriverConfig =
	(Tool == ToolType::Strip) ? parseStripOptions(Args, reportWarning)
	: ((Tool == ToolType::InstallNameTool)
	? parseInstallNameToolOptions(Args)
	: parseObjcopyOptions(Args, reportWarning));
	if (!DriverConfig) {
	logAllUnhandledErrors(DriverConfig.takeError(),
	WithColor::error(errs(), ToolName));
	return 1;
	}
	for (CopyConfig &CopyConfig : DriverConfig->CopyConfigs) {
	if (Error E = executeObjcopy(CopyConfig)) {
	logAllUnhandledErrors(std::move(E), WithColor::error(errs(), ToolName));
	return 1;
	}
	}

	return 0;
	}