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388 lines
13 KiB
388 lines
13 KiB
//===- LibDriver.cpp - lib.exe-compatible driver --------------------------===//
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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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//
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// Defines an interface to a lib.exe-compatible driver that also understands
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// bitcode files. Used by llvm-lib and lld-link /lib.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ToolDrivers/llvm-lib/LibDriver.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/BinaryFormat/COFF.h"
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#include "llvm/BinaryFormat/Magic.h"
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#include "llvm/Bitcode/BitcodeReader.h"
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#include "llvm/Object/ArchiveWriter.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Object/WindowsMachineFlag.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/CommandLine.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/StringSaver.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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enum {
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OPT_INVALID = 0,
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#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID,
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#include "Options.inc"
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#undef OPTION
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};
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#define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE;
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#include "Options.inc"
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#undef PREFIX
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static const opt::OptTable::Info InfoTable[] = {
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#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12) \
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{X1, X2, X10, X11, OPT_##ID, opt::Option::KIND##Class, \
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X9, X8, OPT_##GROUP, OPT_##ALIAS, X7, X12},
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#include "Options.inc"
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#undef OPTION
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};
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class LibOptTable : public opt::OptTable {
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public:
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LibOptTable() : OptTable(InfoTable, true) {}
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};
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}
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static std::string getDefaultOutputPath(const NewArchiveMember &FirstMember) {
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SmallString<128> Val = StringRef(FirstMember.Buf->getBufferIdentifier());
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sys::path::replace_extension(Val, ".lib");
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return std::string(Val.str());
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}
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static std::vector<StringRef> getSearchPaths(opt::InputArgList *Args,
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StringSaver &Saver) {
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std::vector<StringRef> Ret;
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// Add current directory as first item of the search path.
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Ret.push_back("");
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// Add /libpath flags.
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for (auto *Arg : Args->filtered(OPT_libpath))
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Ret.push_back(Arg->getValue());
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// Add $LIB.
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Optional<std::string> EnvOpt = sys::Process::GetEnv("LIB");
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if (!EnvOpt.hasValue())
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return Ret;
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StringRef Env = Saver.save(*EnvOpt);
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while (!Env.empty()) {
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StringRef Path;
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std::tie(Path, Env) = Env.split(';');
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Ret.push_back(Path);
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}
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return Ret;
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}
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static std::string findInputFile(StringRef File, ArrayRef<StringRef> Paths) {
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for (StringRef Dir : Paths) {
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SmallString<128> Path = Dir;
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sys::path::append(Path, File);
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if (sys::fs::exists(Path))
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return std::string(Path);
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}
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return "";
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}
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static void fatalOpenError(llvm::Error E, Twine File) {
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if (!E)
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return;
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handleAllErrors(std::move(E), [&](const llvm::ErrorInfoBase &EIB) {
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llvm::errs() << "error opening '" << File << "': " << EIB.message() << '\n';
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exit(1);
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});
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}
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static void doList(opt::InputArgList& Args) {
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// lib.exe prints the contents of the first archive file.
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std::unique_ptr<MemoryBuffer> B;
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for (auto *Arg : Args.filtered(OPT_INPUT)) {
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// Create or open the archive object.
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ErrorOr<std::unique_ptr<MemoryBuffer>> MaybeBuf =
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MemoryBuffer::getFile(Arg->getValue(), -1, false);
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fatalOpenError(errorCodeToError(MaybeBuf.getError()), Arg->getValue());
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if (identify_magic(MaybeBuf.get()->getBuffer()) == file_magic::archive) {
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B = std::move(MaybeBuf.get());
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break;
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}
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}
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// lib.exe doesn't print an error if no .lib files are passed.
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if (!B)
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return;
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Error Err = Error::success();
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object::Archive Archive(B.get()->getMemBufferRef(), Err);
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fatalOpenError(std::move(Err), B->getBufferIdentifier());
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for (auto &C : Archive.children(Err)) {
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Expected<StringRef> NameOrErr = C.getName();
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fatalOpenError(NameOrErr.takeError(), B->getBufferIdentifier());
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StringRef Name = NameOrErr.get();
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llvm::outs() << Name << '\n';
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}
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fatalOpenError(std::move(Err), B->getBufferIdentifier());
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}
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static COFF::MachineTypes getCOFFFileMachine(MemoryBufferRef MB) {
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std::error_code EC;
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auto Obj = object::COFFObjectFile::create(MB);
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if (!Obj) {
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llvm::errs() << MB.getBufferIdentifier()
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<< ": failed to open: " << Obj.takeError() << '\n';
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exit(1);
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}
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uint16_t Machine = (*Obj)->getMachine();
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if (Machine != COFF::IMAGE_FILE_MACHINE_I386 &&
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Machine != COFF::IMAGE_FILE_MACHINE_AMD64 &&
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Machine != COFF::IMAGE_FILE_MACHINE_ARMNT &&
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Machine != COFF::IMAGE_FILE_MACHINE_ARM64) {
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llvm::errs() << MB.getBufferIdentifier() << ": unknown machine: " << Machine
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<< '\n';
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exit(1);
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}
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return static_cast<COFF::MachineTypes>(Machine);
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}
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static COFF::MachineTypes getBitcodeFileMachine(MemoryBufferRef MB) {
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Expected<std::string> TripleStr = getBitcodeTargetTriple(MB);
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if (!TripleStr) {
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llvm::errs() << MB.getBufferIdentifier()
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<< ": failed to get target triple from bitcode\n";
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exit(1);
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}
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switch (Triple(*TripleStr).getArch()) {
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case Triple::x86:
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return COFF::IMAGE_FILE_MACHINE_I386;
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case Triple::x86_64:
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return COFF::IMAGE_FILE_MACHINE_AMD64;
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case Triple::arm:
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return COFF::IMAGE_FILE_MACHINE_ARMNT;
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case Triple::aarch64:
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return COFF::IMAGE_FILE_MACHINE_ARM64;
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default:
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llvm::errs() << MB.getBufferIdentifier()
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<< ": unknown arch in target triple " << *TripleStr << '\n';
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exit(1);
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}
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}
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static void appendFile(std::vector<NewArchiveMember> &Members,
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COFF::MachineTypes &LibMachine,
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std::string &LibMachineSource, MemoryBufferRef MB) {
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file_magic Magic = identify_magic(MB.getBuffer());
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if (Magic != file_magic::coff_object && Magic != file_magic::bitcode &&
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Magic != file_magic::archive && Magic != file_magic::windows_resource &&
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Magic != file_magic::coff_import_library) {
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llvm::errs() << MB.getBufferIdentifier()
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<< ": not a COFF object, bitcode, archive, import library or "
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"resource file\n";
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exit(1);
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}
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// If a user attempts to add an archive to another archive, llvm-lib doesn't
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// handle the first archive file as a single file. Instead, it extracts all
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// members from the archive and add them to the second archive. This beahvior
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// is for compatibility with Microsoft's lib command.
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if (Magic == file_magic::archive) {
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Error Err = Error::success();
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object::Archive Archive(MB, Err);
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fatalOpenError(std::move(Err), MB.getBufferIdentifier());
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for (auto &C : Archive.children(Err)) {
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Expected<MemoryBufferRef> ChildMB = C.getMemoryBufferRef();
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if (!ChildMB) {
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handleAllErrors(ChildMB.takeError(), [&](const ErrorInfoBase &EIB) {
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llvm::errs() << MB.getBufferIdentifier() << ": " << EIB.message()
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<< "\n";
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});
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exit(1);
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}
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appendFile(Members, LibMachine, LibMachineSource, *ChildMB);
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}
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fatalOpenError(std::move(Err), MB.getBufferIdentifier());
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return;
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}
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// Check that all input files have the same machine type.
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// Mixing normal objects and LTO bitcode files is fine as long as they
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// have the same machine type.
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// Doing this here duplicates the header parsing work that writeArchive()
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// below does, but it's not a lot of work and it's a bit awkward to do
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// in writeArchive() which needs to support many tools, can't assume the
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// input is COFF, and doesn't have a good way to report errors.
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if (Magic == file_magic::coff_object || Magic == file_magic::bitcode) {
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COFF::MachineTypes FileMachine = (Magic == file_magic::coff_object)
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? getCOFFFileMachine(MB)
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: getBitcodeFileMachine(MB);
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// FIXME: Once lld-link rejects multiple resource .obj files:
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// Call convertResToCOFF() on .res files and add the resulting
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// COFF file to the .lib output instead of adding the .res file, and remove
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// this check. See PR42180.
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if (FileMachine != COFF::IMAGE_FILE_MACHINE_UNKNOWN) {
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if (LibMachine == COFF::IMAGE_FILE_MACHINE_UNKNOWN) {
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LibMachine = FileMachine;
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LibMachineSource =
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(" (inferred from earlier file '" + MB.getBufferIdentifier() + "')")
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.str();
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} else if (LibMachine != FileMachine) {
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llvm::errs() << MB.getBufferIdentifier() << ": file machine type "
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<< machineToStr(FileMachine)
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<< " conflicts with library machine type "
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<< machineToStr(LibMachine) << LibMachineSource << '\n';
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exit(1);
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}
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}
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}
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Members.emplace_back(MB);
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}
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int llvm::libDriverMain(ArrayRef<const char *> ArgsArr) {
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BumpPtrAllocator Alloc;
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StringSaver Saver(Alloc);
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// Parse command line arguments.
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SmallVector<const char *, 20> NewArgs(ArgsArr.begin(), ArgsArr.end());
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cl::ExpandResponseFiles(Saver, cl::TokenizeWindowsCommandLine, NewArgs);
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ArgsArr = NewArgs;
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LibOptTable Table;
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unsigned MissingIndex;
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unsigned MissingCount;
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opt::InputArgList Args =
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Table.ParseArgs(ArgsArr.slice(1), MissingIndex, MissingCount);
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if (MissingCount) {
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llvm::errs() << "missing arg value for \""
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<< Args.getArgString(MissingIndex) << "\", expected "
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<< MissingCount
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<< (MissingCount == 1 ? " argument.\n" : " arguments.\n");
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return 1;
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}
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for (auto *Arg : Args.filtered(OPT_UNKNOWN))
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llvm::errs() << "ignoring unknown argument: " << Arg->getAsString(Args)
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<< "\n";
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// Handle /help
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if (Args.hasArg(OPT_help)) {
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Table.PrintHelp(outs(), "llvm-lib [options] file...", "LLVM Lib");
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return 0;
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}
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// If no input files and not told otherwise, silently do nothing to match
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// lib.exe
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if (!Args.hasArgNoClaim(OPT_INPUT) && !Args.hasArg(OPT_llvmlibempty))
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return 0;
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if (Args.hasArg(OPT_lst)) {
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doList(Args);
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return 0;
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}
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std::vector<StringRef> SearchPaths = getSearchPaths(&Args, Saver);
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COFF::MachineTypes LibMachine = COFF::IMAGE_FILE_MACHINE_UNKNOWN;
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std::string LibMachineSource;
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if (auto *Arg = Args.getLastArg(OPT_machine)) {
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LibMachine = getMachineType(Arg->getValue());
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if (LibMachine == COFF::IMAGE_FILE_MACHINE_UNKNOWN) {
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llvm::errs() << "unknown /machine: arg " << Arg->getValue() << '\n';
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return 1;
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}
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LibMachineSource =
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std::string(" (from '/machine:") + Arg->getValue() + "' flag)";
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}
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std::vector<std::unique_ptr<MemoryBuffer>> MBs;
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StringSet<> Seen;
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std::vector<NewArchiveMember> Members;
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// Create a NewArchiveMember for each input file.
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for (auto *Arg : Args.filtered(OPT_INPUT)) {
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// Find a file
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std::string Path = findInputFile(Arg->getValue(), SearchPaths);
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if (Path.empty()) {
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llvm::errs() << Arg->getValue() << ": no such file or directory\n";
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return 1;
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}
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// Input files are uniquified by pathname. If you specify the exact same
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// path more than once, all but the first one are ignored.
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//
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// Note that there's a loophole in the rule; you can prepend `.\` or
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// something like that to a path to make it look different, and they are
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// handled as if they were different files. This behavior is compatible with
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// Microsoft lib.exe.
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if (!Seen.insert(Path).second)
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continue;
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// Open a file.
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ErrorOr<std::unique_ptr<MemoryBuffer>> MOrErr =
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MemoryBuffer::getFile(Path, -1, false);
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fatalOpenError(errorCodeToError(MOrErr.getError()), Path);
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MemoryBufferRef MBRef = (*MOrErr)->getMemBufferRef();
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// Append a file.
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appendFile(Members, LibMachine, LibMachineSource, MBRef);
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// Take the ownership of the file buffer to keep the file open.
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MBs.push_back(std::move(*MOrErr));
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}
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// Create an archive file.
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std::string OutputPath;
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if (auto *Arg = Args.getLastArg(OPT_out)) {
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OutputPath = Arg->getValue();
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} else if (!Members.empty()) {
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OutputPath = getDefaultOutputPath(Members[0]);
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} else {
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llvm::errs() << "no output path given, and cannot infer with no inputs\n";
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return 1;
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}
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// llvm-lib uses relative paths for both regular and thin archives, unlike
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// standard GNU ar, which only uses relative paths for thin archives and
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// basenames for regular archives.
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for (NewArchiveMember &Member : Members) {
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if (sys::path::is_relative(Member.MemberName)) {
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Expected<std::string> PathOrErr =
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computeArchiveRelativePath(OutputPath, Member.MemberName);
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if (PathOrErr)
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Member.MemberName = Saver.save(*PathOrErr);
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}
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}
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if (Error E =
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writeArchive(OutputPath, Members,
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/*WriteSymtab=*/true, object::Archive::K_GNU,
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/*Deterministic*/ true, Args.hasArg(OPT_llvmlibthin))) {
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handleAllErrors(std::move(E), [&](const ErrorInfoBase &EI) {
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llvm::errs() << OutputPath << ": " << EI.message() << "\n";
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});
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return 1;
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}
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return 0;
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}
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