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llvm-project/llvm/tools/llvm-objcopy/llvm-objcopy.cpp

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//===- 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 "COFF/COFFConfig.h"
#include "COFF/COFFObjcopy.h"
#include "CommonConfig.h"
#include "ConfigManager.h"
#include "ELF/ELFConfig.h"
#include "ELF/ELFObjcopy.h"
#include "MachO/MachOConfig.h"
#include "MachO/MachOObjcopy.h"
#include "wasm/WasmConfig.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/BinaryFormat/ELF.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/MachOUniversal.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/Errc.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/SmallVectorMemoryBuffer.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>
using namespace llvm;
using namespace llvm::objcopy;
using namespace llvm::object;
// The name this program was invoked as.
static StringRef ToolName;
static ErrorSuccess reportWarning(Error E) {
assert(E);
WithColor::warning(errs(), ToolName) << toString(std::move(E)) << '\n';
return Error::success();
}
static Expected<DriverConfig> getDriverConfig(ArrayRef<const char *> Args) {
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_insensitive(Tool);
return I != StringRef::npos &&
(I + Tool.size() == Stem.size() || !isAlnum(Stem[I + Tool.size()]));
};
if (Is("bitcode-strip") || Is("bitcode_strip"))
return parseBitcodeStripOptions(Args);
else if (Is("strip"))
return parseStripOptions(Args, reportWarning);
else if (Is("install-name-tool") || Is("install_name_tool"))
return parseInstallNameToolOptions(Args);
else
return parseObjcopyOptions(Args, reportWarning);
}
// 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) {
// For regular files (as 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.
Expected<std::unique_ptr<FileOutputBuffer>> FB =
FileOutputBuffer::create(Member.MemberName, Member.Buf->getBufferSize(),
FileOutputBuffer::F_executable);
if (!FB)
return FB.takeError();
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(ConfigManager &ConfigMgr, MemoryBuffer &In,
raw_ostream &Out) {
// TODO: support output formats other than ELF.
Expected<const ELFConfig &> ELFConfig = ConfigMgr.getELFConfig();
if (!ELFConfig)
return ELFConfig.takeError();
return elf::executeObjcopyOnIHex(ConfigMgr.getCommonConfig(), *ELFConfig, In,
Out);
}
/// The function executeObjcopyOnRawBinary does the dispatch based on the format
/// of the output specified by the command line options.
static Error executeObjcopyOnRawBinary(ConfigManager &ConfigMgr,
MemoryBuffer &In, raw_ostream &Out) {
const CommonConfig &Config = ConfigMgr.getCommonConfig();
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:
Expected<const ELFConfig &> ELFConfig = ConfigMgr.getELFConfig();
if (!ELFConfig)
return ELFConfig.takeError();
return elf::executeObjcopyOnRawBinary(Config, *ELFConfig, 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(const MultiFormatConfig &Config,
object::Binary &In, raw_ostream &Out) {
if (auto *ELFBinary = dyn_cast<object::ELFObjectFileBase>(&In)) {
Expected<const ELFConfig &> ELFConfig = Config.getELFConfig();
if (!ELFConfig)
return ELFConfig.takeError();
return elf::executeObjcopyOnBinary(Config.getCommonConfig(), *ELFConfig,
*ELFBinary, Out);
} else if (auto *COFFBinary = dyn_cast<object::COFFObjectFile>(&In)) {
Expected<const COFFConfig &> COFFConfig = Config.getCOFFConfig();
if (!COFFConfig)
return COFFConfig.takeError();
return coff::executeObjcopyOnBinary(Config.getCommonConfig(), *COFFConfig,
*COFFBinary, Out);
} else if (auto *MachOBinary = dyn_cast<object::MachOObjectFile>(&In)) {
Expected<const MachOConfig &> MachOConfig = Config.getMachOConfig();
if (!MachOConfig)
return MachOConfig.takeError();
return macho::executeObjcopyOnBinary(Config.getCommonConfig(), *MachOConfig,
*MachOBinary, Out);
} else if (auto *MachOUniversalBinary =
dyn_cast<object::MachOUniversalBinary>(&In)) {
return macho::executeObjcopyOnMachOUniversalBinary(
Config, *MachOUniversalBinary, Out);
} else if (auto *WasmBinary = dyn_cast<object::WasmObjectFile>(&In)) {
Expected<const WasmConfig &> WasmConfig = Config.getWasmConfig();
if (!WasmConfig)
return WasmConfig.takeError();
return objcopy::wasm::executeObjcopyOnBinary(Config.getCommonConfig(),
*WasmConfig, *WasmBinary, Out);
} else
return createStringError(object_error::invalid_file_type,
"unsupported object file format");
}
namespace llvm {
namespace objcopy {
Expected<std::vector<NewArchiveMember>>
createNewArchiveMembers(const MultiFormatConfig &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());
SmallVector<char, 0> Buffer;
raw_svector_ostream MemStream(Buffer);
if (Error E = executeObjcopyOnBinary(Config, *ChildOrErr->get(), MemStream))
return std::move(E);
Expected<NewArchiveMember> Member = NewArchiveMember::getOldMember(
Child, Config.getCommonConfig().DeterministicArchives);
if (!Member)
return createFileError(Ar.getFileName(), Member.takeError());
Member->Buf = std::make_unique<SmallVectorMemoryBuffer>(
std::move(Buffer), ChildNameOrErr.get());
Member->MemberName = Member->Buf->getBufferIdentifier();
NewArchiveMembers.push_back(std::move(*Member));
}
if (Err)
return createFileError(Config.getCommonConfig().InputFilename,
std::move(Err));
return std::move(NewArchiveMembers);
}
} // end namespace objcopy
} // end namespace llvm
static Error executeObjcopyOnArchive(const ConfigManager &ConfigMgr,
const object::Archive &Ar) {
Expected<std::vector<NewArchiveMember>> NewArchiveMembersOrErr =
createNewArchiveMembers(ConfigMgr, Ar);
if (!NewArchiveMembersOrErr)
return NewArchiveMembersOrErr.takeError();
const CommonConfig &Config = ConfigMgr.getCommonConfig();
return deepWriteArchive(Config.OutputFilename, *NewArchiveMembersOrErr,
Ar.hasSymbolTable(), Ar.kind(),
Config.DeterministicArchives, Ar.isThin());
}
static Error restoreStatOnFile(StringRef Filename,
const sys::fs::file_status &Stat,
const ConfigManager &ConfigMgr) {
int FD;
const CommonConfig &Config = ConfigMgr.getCommonConfig();
// 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 (Config.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) {
#ifndef _WIN32
// Keep ownership if llvm-objcopy is called under root.
if (Config.InputFilename == Config.OutputFilename && OStat.getUser() == 0)
sys::fs::changeFileOwnership(FD, Stat.getUser(), Stat.getGroup());
#endif
sys::fs::perms Perm = Stat.permissions();
if (Config.InputFilename != Config.OutputFilename)
Perm = static_cast<sys::fs::perms>(Perm & ~sys::fs::getUmask() & ~06000);
#ifdef _WIN32
if (auto EC = sys::fs::setPermissions(Filename, Perm))
#else
if (auto EC = sys::fs::setPermissions(FD, Perm))
#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(ConfigManager &ConfigMgr) {
CommonConfig &Config = ConfigMgr.Common;
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));
}
std::function<Error(raw_ostream & OutFile)> ObjcopyFunc;
OwningBinary<llvm::object::Binary> BinaryHolder;
std::unique_ptr<MemoryBuffer> MemoryBufferHolder;
if (Config.InputFormat == FileFormat::Binary ||
Config.InputFormat == FileFormat::IHex) {
ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
MemoryBuffer::getFileOrSTDIN(Config.InputFilename);
if (!BufOrErr)
return createFileError(Config.InputFilename, BufOrErr.getError());
MemoryBufferHolder = std::move(*BufOrErr);
if (Config.InputFormat == FileFormat::Binary)
ObjcopyFunc = [&](raw_ostream &OutFile) -> Error {
// Handle FileFormat::Binary.
return executeObjcopyOnRawBinary(ConfigMgr, *MemoryBufferHolder,
OutFile);
};
else
ObjcopyFunc = [&](raw_ostream &OutFile) -> Error {
// Handle FileFormat::IHex.
return executeObjcopyOnIHex(ConfigMgr, *MemoryBufferHolder, OutFile);
};
} else {
Expected<OwningBinary<llvm::object::Binary>> BinaryOrErr =
createBinary(Config.InputFilename);
if (!BinaryOrErr)
return createFileError(Config.InputFilename, BinaryOrErr.takeError());
BinaryHolder = std::move(*BinaryOrErr);
if (Archive *Ar = dyn_cast<Archive>(BinaryHolder.getBinary())) {
// Handle Archive.
if (Error E = executeObjcopyOnArchive(ConfigMgr, *Ar))
return E;
} else {
// Handle llvm::object::Binary.
ObjcopyFunc = [&](raw_ostream &OutFile) -> Error {
return executeObjcopyOnBinary(ConfigMgr, *BinaryHolder.getBinary(),
OutFile);
};
}
}
if (ObjcopyFunc) {
if (Config.SplitDWO.empty()) {
// Apply transformations described by Config and store result into
// Config.OutputFilename using specified ObjcopyFunc function.
if (Error E = writeToOutput(Config.OutputFilename, ObjcopyFunc))
return E;
} else {
Config.ExtractDWO = true;
Config.StripDWO = false;
// Copy .dwo tables from the Config.InputFilename into Config.SplitDWO
// file using specified ObjcopyFunc function.
if (Error E = writeToOutput(Config.SplitDWO, ObjcopyFunc))
return E;
Config.ExtractDWO = false;
Config.StripDWO = true;
// Apply transformations described by Config, remove .dwo tables and
// store result into Config.OutputFilename using specified ObjcopyFunc
// function.
if (Error E = writeToOutput(Config.OutputFilename, ObjcopyFunc))
return E;
}
}
if (Error E = restoreStatOnFile(Config.OutputFilename, Stat, ConfigMgr))
return E;
if (!Config.SplitDWO.empty()) {
Stat.permissions(static_cast<sys::fs::perms>(0666));
if (Error E = restoreStatOnFile(Config.SplitDWO, Stat, ConfigMgr))
return E;
}
return Error::success();
}
int main(int argc, char **argv) {
InitLLVM X(argc, argv);
ToolName = argv[0];
// 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 = getDriverConfig(Args);
if (!DriverConfig) {
logAllUnhandledErrors(DriverConfig.takeError(),
WithColor::error(errs(), ToolName));
return 1;
}
for (ConfigManager &ConfigMgr : DriverConfig->CopyConfigs) {
if (Error E = executeObjcopy(ConfigMgr)) {
logAllUnhandledErrors(std::move(E), WithColor::error(errs(), ToolName));
return 1;
}
}
return 0;
}
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