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2bc33a6598
This patch prepares llvm-objcopy to move its implementation into a separate library. To make it possible it is necessary to minimize internal dependencies. Differential Revision: https://reviews.llvm.org/D99055
448 lines
16 KiB
C++
448 lines
16 KiB
C++
//===- llvm-objcopy.cpp ---------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm-objcopy.h"
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#include "COFF/COFFConfig.h"
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#include "COFF/COFFObjcopy.h"
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#include "CommonConfig.h"
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#include "ConfigManager.h"
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#include "ELF/ELFConfig.h"
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#include "ELF/ELFObjcopy.h"
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#include "MachO/MachOConfig.h"
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#include "MachO/MachOObjcopy.h"
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#include "wasm/WasmConfig.h"
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#include "wasm/WasmObjcopy.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/Object/Archive.h"
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#include "llvm/Object/ArchiveWriter.h"
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#include "llvm/Object/Binary.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Object/ELFTypes.h"
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#include "llvm/Object/Error.h"
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#include "llvm/Object/MachO.h"
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#include "llvm/Object/MachOUniversal.h"
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#include "llvm/Object/Wasm.h"
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#include "llvm/Option/Arg.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Option/Option.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/InitLLVM.h"
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#include "llvm/Support/Memory.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Process.h"
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#include "llvm/Support/SmallVectorMemoryBuffer.h"
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#include "llvm/Support/StringSaver.h"
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#include "llvm/Support/WithColor.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cassert>
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#include <cstdlib>
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#include <memory>
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#include <string>
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#include <system_error>
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#include <utility>
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namespace llvm {
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namespace objcopy {
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// The name this program was invoked as.
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StringRef ToolName;
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ErrorSuccess reportWarning(Error E) {
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assert(E);
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WithColor::warning(errs(), ToolName) << toString(std::move(E)) << '\n';
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return Error::success();
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}
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static Expected<DriverConfig> getDriverConfig(ArrayRef<const char *> Args) {
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StringRef Stem = sys::path::stem(ToolName);
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auto Is = [=](StringRef Tool) {
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// We need to recognize the following filenames:
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//
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// llvm-objcopy -> objcopy
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// strip-10.exe -> strip
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// powerpc64-unknown-freebsd13-objcopy -> objcopy
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// llvm-install-name-tool -> install-name-tool
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auto I = Stem.rfind_lower(Tool);
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return I != StringRef::npos &&
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(I + Tool.size() == Stem.size() || !isAlnum(Stem[I + Tool.size()]));
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};
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if (Is("bitcode-strip") || Is("bitcode_strip"))
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return parseBitcodeStripOptions(Args);
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else if (Is("strip"))
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return parseStripOptions(Args, reportWarning);
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else if (Is("install-name-tool") || Is("install_name_tool"))
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return parseInstallNameToolOptions(Args);
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else
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return parseObjcopyOptions(Args, reportWarning);
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}
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} // end namespace objcopy
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} // end namespace llvm
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using namespace llvm;
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using namespace llvm::object;
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using namespace llvm::objcopy;
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// For regular archives this function simply calls llvm::writeArchive,
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// For thin archives it writes the archive file itself as well as its members.
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static Error deepWriteArchive(StringRef ArcName,
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ArrayRef<NewArchiveMember> NewMembers,
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bool WriteSymtab, object::Archive::Kind Kind,
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bool Deterministic, bool Thin) {
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if (Error E = writeArchive(ArcName, NewMembers, WriteSymtab, Kind,
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Deterministic, Thin))
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return createFileError(ArcName, std::move(E));
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if (!Thin)
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return Error::success();
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for (const NewArchiveMember &Member : NewMembers) {
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// For regular files (as is the case for deepWriteArchive),
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// FileOutputBuffer::create will return OnDiskBuffer.
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// OnDiskBuffer uses a temporary file and then renames it. So in reality
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// there is no inefficiency / duplicated in-memory buffers in this case. For
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// now in-memory buffers can not be completely avoided since
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// NewArchiveMember still requires them even though writeArchive does not
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// write them on disk.
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Expected<std::unique_ptr<FileOutputBuffer>> FB =
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FileOutputBuffer::create(Member.MemberName, Member.Buf->getBufferSize(),
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FileOutputBuffer::F_executable);
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if (!FB)
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return FB.takeError();
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std::copy(Member.Buf->getBufferStart(), Member.Buf->getBufferEnd(),
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(*FB)->getBufferStart());
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if (Error E = (*FB)->commit())
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return E;
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}
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return Error::success();
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}
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/// The function executeObjcopyOnIHex does the dispatch based on the format
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/// of the output specified by the command line options.
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static Error executeObjcopyOnIHex(ConfigManager &ConfigMgr, MemoryBuffer &In,
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raw_ostream &Out) {
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// TODO: support output formats other than ELF.
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Expected<const ELFConfig &> ELFConfig = ConfigMgr.getELFConfig();
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if (!ELFConfig)
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return ELFConfig.takeError();
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return elf::executeObjcopyOnIHex(ConfigMgr.getCommonConfig(), *ELFConfig, In,
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Out);
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}
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/// The function executeObjcopyOnRawBinary does the dispatch based on the format
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/// of the output specified by the command line options.
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static Error executeObjcopyOnRawBinary(ConfigManager &ConfigMgr,
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MemoryBuffer &In, raw_ostream &Out) {
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const CommonConfig &Config = ConfigMgr.getCommonConfig();
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switch (Config.OutputFormat) {
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case FileFormat::ELF:
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// FIXME: Currently, we call elf::executeObjcopyOnRawBinary even if the
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// output format is binary/ihex or it's not given. This behavior differs from
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// GNU objcopy. See https://bugs.llvm.org/show_bug.cgi?id=42171 for details.
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case FileFormat::Binary:
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case FileFormat::IHex:
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case FileFormat::Unspecified:
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Expected<const ELFConfig &> ELFConfig = ConfigMgr.getELFConfig();
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if (!ELFConfig)
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return ELFConfig.takeError();
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return elf::executeObjcopyOnRawBinary(Config, *ELFConfig, In, Out);
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}
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llvm_unreachable("unsupported output format");
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}
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/// The function executeObjcopyOnBinary does the dispatch based on the format
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/// of the input binary (ELF, MachO or COFF).
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static Error executeObjcopyOnBinary(const MultiFormatConfig &Config,
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object::Binary &In, raw_ostream &Out) {
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if (auto *ELFBinary = dyn_cast<object::ELFObjectFileBase>(&In)) {
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Expected<const ELFConfig &> ELFConfig = Config.getELFConfig();
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if (!ELFConfig)
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return ELFConfig.takeError();
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return elf::executeObjcopyOnBinary(Config.getCommonConfig(), *ELFConfig,
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*ELFBinary, Out);
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} else if (auto *COFFBinary = dyn_cast<object::COFFObjectFile>(&In)) {
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Expected<const COFFConfig &> COFFConfig = Config.getCOFFConfig();
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if (!COFFConfig)
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return COFFConfig.takeError();
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return coff::executeObjcopyOnBinary(Config.getCommonConfig(), *COFFConfig,
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*COFFBinary, Out);
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} else if (auto *MachOBinary = dyn_cast<object::MachOObjectFile>(&In)) {
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Expected<const MachOConfig &> MachOConfig = Config.getMachOConfig();
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if (!MachOConfig)
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return MachOConfig.takeError();
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return macho::executeObjcopyOnBinary(Config.getCommonConfig(), *MachOConfig,
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*MachOBinary, Out);
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} else if (auto *MachOUniversalBinary =
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dyn_cast<object::MachOUniversalBinary>(&In)) {
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return macho::executeObjcopyOnMachOUniversalBinary(
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Config, *MachOUniversalBinary, Out);
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} else if (auto *WasmBinary = dyn_cast<object::WasmObjectFile>(&In)) {
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Expected<const WasmConfig &> WasmConfig = Config.getWasmConfig();
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if (!WasmConfig)
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return WasmConfig.takeError();
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return objcopy::wasm::executeObjcopyOnBinary(Config.getCommonConfig(),
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*WasmConfig, *WasmBinary, Out);
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} else
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return createStringError(object_error::invalid_file_type,
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"unsupported object file format");
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}
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namespace llvm {
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namespace objcopy {
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Expected<std::vector<NewArchiveMember>>
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createNewArchiveMembers(const MultiFormatConfig &Config, const Archive &Ar) {
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std::vector<NewArchiveMember> NewArchiveMembers;
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Error Err = Error::success();
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for (const Archive::Child &Child : Ar.children(Err)) {
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Expected<StringRef> ChildNameOrErr = Child.getName();
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if (!ChildNameOrErr)
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return createFileError(Ar.getFileName(), ChildNameOrErr.takeError());
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Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
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if (!ChildOrErr)
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return createFileError(Ar.getFileName() + "(" + *ChildNameOrErr + ")",
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ChildOrErr.takeError());
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SmallVector<char, 0> Buffer;
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raw_svector_ostream MemStream(Buffer);
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if (Error E = executeObjcopyOnBinary(Config, *ChildOrErr->get(), MemStream))
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return std::move(E);
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Expected<NewArchiveMember> Member = NewArchiveMember::getOldMember(
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Child, Config.getCommonConfig().DeterministicArchives);
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if (!Member)
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return createFileError(Ar.getFileName(), Member.takeError());
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Member->Buf = std::make_unique<SmallVectorMemoryBuffer>(
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std::move(Buffer), ChildNameOrErr.get());
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Member->MemberName = Member->Buf->getBufferIdentifier();
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NewArchiveMembers.push_back(std::move(*Member));
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}
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if (Err)
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return createFileError(Config.getCommonConfig().InputFilename,
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std::move(Err));
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return std::move(NewArchiveMembers);
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}
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} // end namespace objcopy
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} // end namespace llvm
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static Error executeObjcopyOnArchive(const ConfigManager &ConfigMgr,
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const object::Archive &Ar) {
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Expected<std::vector<NewArchiveMember>> NewArchiveMembersOrErr =
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createNewArchiveMembers(ConfigMgr, Ar);
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if (!NewArchiveMembersOrErr)
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return NewArchiveMembersOrErr.takeError();
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const CommonConfig &Config = ConfigMgr.getCommonConfig();
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return deepWriteArchive(Config.OutputFilename, *NewArchiveMembersOrErr,
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Ar.hasSymbolTable(), Ar.kind(),
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Config.DeterministicArchives, Ar.isThin());
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}
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static Error restoreStatOnFile(StringRef Filename,
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const sys::fs::file_status &Stat,
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const ConfigManager &ConfigMgr) {
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int FD;
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const CommonConfig &Config = ConfigMgr.getCommonConfig();
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// Writing to stdout should not be treated as an error here, just
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// do not set access/modification times or permissions.
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if (Filename == "-")
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return Error::success();
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if (auto EC =
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sys::fs::openFileForWrite(Filename, FD, sys::fs::CD_OpenExisting))
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return createFileError(Filename, EC);
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if (Config.PreserveDates)
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if (auto EC = sys::fs::setLastAccessAndModificationTime(
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FD, Stat.getLastAccessedTime(), Stat.getLastModificationTime()))
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return createFileError(Filename, EC);
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sys::fs::file_status OStat;
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if (std::error_code EC = sys::fs::status(FD, OStat))
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return createFileError(Filename, EC);
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if (OStat.type() == sys::fs::file_type::regular_file) {
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#ifndef _WIN32
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// Keep ownership if llvm-objcopy is called under root.
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if (Config.InputFilename == Config.OutputFilename && OStat.getUser() == 0)
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sys::fs::changeFileOwnership(FD, Stat.getUser(), Stat.getGroup());
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#endif
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sys::fs::perms Perm = Stat.permissions();
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if (Config.InputFilename != Config.OutputFilename)
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Perm = static_cast<sys::fs::perms>(Perm & ~sys::fs::getUmask() & ~06000);
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#ifdef _WIN32
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if (auto EC = sys::fs::setPermissions(Filename, Perm))
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#else
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if (auto EC = sys::fs::setPermissions(FD, Perm))
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#endif
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return createFileError(Filename, EC);
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}
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if (auto EC = sys::Process::SafelyCloseFileDescriptor(FD))
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return createFileError(Filename, EC);
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return Error::success();
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}
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/// The function executeObjcopy does the higher level dispatch based on the type
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/// of input (raw binary, archive or single object file) and takes care of the
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/// format-agnostic modifications, i.e. preserving dates.
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static Error executeObjcopy(ConfigManager &ConfigMgr) {
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CommonConfig &Config = ConfigMgr.Common;
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sys::fs::file_status Stat;
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if (Config.InputFilename != "-") {
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if (auto EC = sys::fs::status(Config.InputFilename, Stat))
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return createFileError(Config.InputFilename, EC);
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} else {
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Stat.permissions(static_cast<sys::fs::perms>(0777));
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}
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std::function<Error(raw_ostream & OutFile)> ObjcopyFunc;
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OwningBinary<llvm::object::Binary> BinaryHolder;
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std::unique_ptr<MemoryBuffer> MemoryBufferHolder;
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if (Config.InputFormat == FileFormat::Binary ||
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Config.InputFormat == FileFormat::IHex) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
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MemoryBuffer::getFileOrSTDIN(Config.InputFilename);
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if (!BufOrErr)
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return createFileError(Config.InputFilename, BufOrErr.getError());
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MemoryBufferHolder = std::move(*BufOrErr);
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if (Config.InputFormat == FileFormat::Binary)
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ObjcopyFunc = [&](raw_ostream &OutFile) -> Error {
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// Handle FileFormat::Binary.
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return executeObjcopyOnRawBinary(ConfigMgr, *MemoryBufferHolder,
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OutFile);
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};
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else
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ObjcopyFunc = [&](raw_ostream &OutFile) -> Error {
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// Handle FileFormat::IHex.
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return executeObjcopyOnIHex(ConfigMgr, *MemoryBufferHolder, OutFile);
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};
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} else {
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Expected<OwningBinary<llvm::object::Binary>> BinaryOrErr =
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createBinary(Config.InputFilename);
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if (!BinaryOrErr)
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return createFileError(Config.InputFilename, BinaryOrErr.takeError());
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BinaryHolder = std::move(*BinaryOrErr);
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if (Archive *Ar = dyn_cast<Archive>(BinaryHolder.getBinary())) {
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// Handle Archive.
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if (Error E = executeObjcopyOnArchive(ConfigMgr, *Ar))
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return E;
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} else {
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// Handle llvm::object::Binary.
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ObjcopyFunc = [&](raw_ostream &OutFile) -> Error {
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return executeObjcopyOnBinary(ConfigMgr, *BinaryHolder.getBinary(),
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OutFile);
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};
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}
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}
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if (ObjcopyFunc) {
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if (Config.SplitDWO.empty()) {
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// Apply transformations described by Config and store result into
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// Config.OutputFilename using specified ObjcopyFunc function.
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if (Error E = writeToOutput(Config.OutputFilename, ObjcopyFunc))
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return E;
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} else {
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Config.ExtractDWO = true;
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Config.StripDWO = false;
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// Copy .dwo tables from the Config.InputFilename into Config.SplitDWO
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// file using specified ObjcopyFunc function.
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if (Error E = writeToOutput(Config.SplitDWO, ObjcopyFunc))
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return E;
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Config.ExtractDWO = false;
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Config.StripDWO = true;
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// Apply transformations described by Config, remove .dwo tables and
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// store result into Config.OutputFilename using specified ObjcopyFunc
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// function.
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if (Error E = writeToOutput(Config.OutputFilename, ObjcopyFunc))
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return E;
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}
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}
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if (Error E = restoreStatOnFile(Config.OutputFilename, Stat, ConfigMgr))
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return E;
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if (!Config.SplitDWO.empty()) {
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Stat.permissions(static_cast<sys::fs::perms>(0666));
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if (Error E = restoreStatOnFile(Config.SplitDWO, Stat, ConfigMgr))
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return E;
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}
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return Error::success();
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}
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namespace {
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} // anonymous namespace
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int main(int argc, char **argv) {
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InitLLVM X(argc, argv);
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ToolName = argv[0];
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// Expand response files.
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// TODO: Move these lines, which are copied from lib/Support/CommandLine.cpp,
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// into a separate function in the CommandLine library and call that function
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// here. This is duplicated code.
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SmallVector<const char *, 20> NewArgv(argv, argv + argc);
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BumpPtrAllocator A;
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StringSaver Saver(A);
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cl::ExpandResponseFiles(Saver,
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Triple(sys::getProcessTriple()).isOSWindows()
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? cl::TokenizeWindowsCommandLine
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: cl::TokenizeGNUCommandLine,
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NewArgv);
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auto Args = makeArrayRef(NewArgv).drop_front();
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Expected<DriverConfig> DriverConfig = getDriverConfig(Args);
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if (!DriverConfig) {
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logAllUnhandledErrors(DriverConfig.takeError(),
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WithColor::error(errs(), ToolName));
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return 1;
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}
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for (ConfigManager &ConfigMgr : DriverConfig->CopyConfigs) {
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if (Error E = executeObjcopy(ConfigMgr)) {
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logAllUnhandledErrors(std::move(E), WithColor::error(errs(), ToolName));
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return 1;
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}
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}
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return 0;
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}
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