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llvm-mirror/tools/llvm-libtool-darwin/llvm-libtool-darwin.cpp
Mehdi Amini 7d809bb14e Use ManagedStatic and lazy initialization of cl::opt in libSupport to make it free of global initializer 
We can build it with -Werror=global-constructors now. This helps
in situation where libSupport is embedded as a shared library,
potential with dlopen/dlclose scenario, and when command-line
parsing or other facilities may not be involved. Avoiding the
implicit construction of these cl::opt can avoid double-registration
issues and other kind of behavior.

Reviewed By: lattner, jpienaar

Differential Revision: https://reviews.llvm.org/D105959
2021-07-16 07:38:16 +00:00

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//===-- llvm-libtool-darwin.cpp - a tool for creating libraries -----------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// A utility for creating static and dynamic libraries for Darwin.
//
//===----------------------------------------------------------------------===//
#include "llvm/BinaryFormat/Magic.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Object/ArchiveWriter.h"
#include "llvm/Object/IRObjectFile.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Object/MachOUniversalWriter.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/VirtualFileSystem.h"
#include "llvm/Support/WithColor.h"
#include "llvm/TextAPI/Architecture.h"
#include <map>
using namespace llvm;
using namespace llvm::object;
static LLVMContext LLVMCtx;
typedef std::map<uint64_t, std::vector<NewArchiveMember>>
MembersPerArchitectureMap;
cl::OptionCategory LibtoolCategory("llvm-libtool-darwin Options");
static cl::opt<std::string> OutputFile("o", cl::desc("Specify output filename"),
cl::value_desc("filename"),
cl::cat(LibtoolCategory));
static cl::list<std::string> InputFiles(cl::Positional,
cl::desc("<input files>"),
cl::ZeroOrMore,
cl::cat(LibtoolCategory));
static cl::opt<std::string> ArchType(
"arch_only", cl::desc("Specify architecture type for output library"),
cl::value_desc("arch_type"), cl::ZeroOrMore, cl::cat(LibtoolCategory));
enum class Operation { None, Static };
static cl::opt<Operation> LibraryOperation(
cl::desc("Library Type: "),
cl::values(
clEnumValN(Operation::Static, "static",
"Produce a statically linked library from the input files")),
cl::init(Operation::None), cl::cat(LibtoolCategory));
static cl::opt<bool> DeterministicOption(
"D", cl::desc("Use zero for timestamps and UIDs/GIDs (Default)"),
cl::init(false), cl::cat(LibtoolCategory));
static cl::opt<bool>
NonDeterministicOption("U", cl::desc("Use actual timestamps and UIDs/GIDs"),
cl::init(false), cl::cat(LibtoolCategory));
static cl::opt<std::string>
FileList("filelist",
cl::desc("Pass in file containing a list of filenames"),
cl::value_desc("listfile[,dirname]"), cl::cat(LibtoolCategory));
static cl::list<std::string> Libraries(
"l",
cl::desc(
"l<x> searches for the library libx.a in the library search path. If"
" the string 'x' ends with '.o', then the library 'x' is searched for"
" without prepending 'lib' or appending '.a'"),
cl::ZeroOrMore, cl::Prefix, cl::cat(LibtoolCategory));
static cl::list<std::string> LibrarySearchDirs(
"L",
cl::desc(
"L<dir> adds <dir> to the list of directories in which to search for"
" libraries"),
cl::ZeroOrMore, cl::Prefix, cl::cat(LibtoolCategory));
static cl::opt<bool>
VersionOption("V", cl::desc("Print the version number and exit"),
cl::cat(LibtoolCategory));
static cl::opt<bool> NoWarningForNoSymbols(
"no_warning_for_no_symbols",
cl::desc("Do not warn about files that have no symbols"),
cl::cat(LibtoolCategory), cl::init(false));
static const std::array<std::string, 3> StandardSearchDirs{
"/lib",
"/usr/lib",
"/usr/local/lib",
};
struct Config {
bool Deterministic = true; // Updated by 'D' and 'U' modifiers.
uint32_t ArchCPUType;
uint32_t ArchCPUSubtype;
};
static Expected<std::string> searchForFile(const Twine &FileName) {
auto FindLib =
[FileName](ArrayRef<std::string> SearchDirs) -> Optional<std::string> {
for (StringRef Dir : SearchDirs) {
SmallString<128> Path;
sys::path::append(Path, Dir, FileName);
if (sys::fs::exists(Path))
return std::string(Path);
}
return None;
};
Optional<std::string> Found = FindLib(LibrarySearchDirs);
if (!Found)
Found = FindLib(StandardSearchDirs);
if (Found)
return *Found;
return createStringError(std::errc::invalid_argument,
"cannot locate file '%s'", FileName.str().c_str());
}
static Error processCommandLineLibraries() {
for (StringRef BaseName : Libraries) {
Expected<std::string> FullPath = searchForFile(
BaseName.endswith(".o") ? BaseName.str() : "lib" + BaseName + ".a");
if (!FullPath)
return FullPath.takeError();
InputFiles.push_back(FullPath.get());
}
return Error::success();
}
static Error processFileList() {
StringRef FileName, DirName;
std::tie(FileName, DirName) = StringRef(FileList).rsplit(",");
ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
MemoryBuffer::getFileOrSTDIN(FileName, /*IsText=*/false,
/*RequiresNullTerminator=*/false);
if (std::error_code EC = FileOrErr.getError())
return createFileError(FileName, errorCodeToError(EC));
const MemoryBuffer &Ref = *FileOrErr.get();
line_iterator I(Ref, /*SkipBlanks=*/false);
if (I.is_at_eof())
return createStringError(std::errc::invalid_argument,
"file list file: '%s' is empty",
FileName.str().c_str());
for (; !I.is_at_eof(); ++I) {
StringRef Line = *I;
if (Line.empty())
return createStringError(std::errc::invalid_argument,
"file list file: '%s': filename cannot be empty",
FileName.str().c_str());
SmallString<128> Path;
if (!DirName.empty())
sys::path::append(Path, DirName, Line);
else
sys::path::append(Path, Line);
InputFiles.push_back(static_cast<std::string>(Path));
}
return Error::success();
}
static Error validateArchitectureName(StringRef ArchitectureName) {
if (!MachOObjectFile::isValidArch(ArchitectureName)) {
std::string Buf;
raw_string_ostream OS(Buf);
for (StringRef Arch : MachOObjectFile::getValidArchs())
OS << Arch << " ";
return createStringError(
std::errc::invalid_argument,
"invalid architecture '%s': valid architecture names are %s",
ArchitectureName.str().c_str(), OS.str().c_str());
}
return Error::success();
}
static uint64_t getCPUID(uint32_t CPUType, uint32_t CPUSubtype) {
switch (CPUType) {
case MachO::CPU_TYPE_ARM:
case MachO::CPU_TYPE_ARM64:
case MachO::CPU_TYPE_ARM64_32:
case MachO::CPU_TYPE_X86_64:
// We consider CPUSubtype only for the above 4 CPUTypes to match cctools'
// libtool behavior.
return static_cast<uint64_t>(CPUType) << 32 | CPUSubtype;
default:
return CPUType;
}
}
// Check that a file's architecture [FileCPUType, FileCPUSubtype]
// matches the architecture specified under -arch_only flag.
static bool acceptFileArch(uint32_t FileCPUType, uint32_t FileCPUSubtype,
const Config &C) {
if (C.ArchCPUType != FileCPUType)
return false;
switch (C.ArchCPUType) {
case MachO::CPU_TYPE_ARM:
case MachO::CPU_TYPE_ARM64_32:
case MachO::CPU_TYPE_X86_64:
return C.ArchCPUSubtype == FileCPUSubtype;
case MachO::CPU_TYPE_ARM64:
if (C.ArchCPUSubtype == MachO::CPU_SUBTYPE_ARM64_ALL)
return FileCPUSubtype == MachO::CPU_SUBTYPE_ARM64_ALL ||
FileCPUSubtype == MachO::CPU_SUBTYPE_ARM64_V8;
else
return C.ArchCPUSubtype == FileCPUSubtype;
default:
return true;
}
}
static Error verifyAndAddMachOObject(MembersPerArchitectureMap &Members,
NewArchiveMember Member, const Config &C) {
auto MBRef = Member.Buf->getMemBufferRef();
Expected<std::unique_ptr<object::ObjectFile>> ObjOrErr =
object::ObjectFile::createObjectFile(MBRef);
// Throw error if not a valid object file.
if (!ObjOrErr)
return createFileError(Member.MemberName, ObjOrErr.takeError());
// Throw error if not in Mach-O format.
if (!isa<object::MachOObjectFile>(**ObjOrErr))
return createStringError(std::errc::invalid_argument,
"'%s': format not supported",
Member.MemberName.data());
auto *O = dyn_cast<MachOObjectFile>(ObjOrErr->get());
uint32_t FileCPUType, FileCPUSubtype;
std::tie(FileCPUType, FileCPUSubtype) = MachO::getCPUTypeFromArchitecture(
MachO::getArchitectureFromName(O->getArchTriple().getArchName()));
// If -arch_only is specified then skip this file if it doesn't match
// the architecture specified.
if (!ArchType.empty() && !acceptFileArch(FileCPUType, FileCPUSubtype, C)) {
return Error::success();
}
if (!NoWarningForNoSymbols && O->symbols().empty())
WithColor::warning() << Member.MemberName + " has no symbols\n";
uint64_t FileCPUID = getCPUID(FileCPUType, FileCPUSubtype);
Members[FileCPUID].push_back(std::move(Member));
return Error::success();
}
static Error verifyAndAddIRObject(MembersPerArchitectureMap &Members,
NewArchiveMember Member, const Config &C) {
auto MBRef = Member.Buf->getMemBufferRef();
Expected<std::unique_ptr<object::IRObjectFile>> IROrErr =
object::IRObjectFile::create(MBRef, LLVMCtx);
// Throw error if not a valid IR object file.
if (!IROrErr)
return createFileError(Member.MemberName, IROrErr.takeError());
Triple TT = Triple(IROrErr->get()->getTargetTriple());
Expected<uint32_t> FileCPUTypeOrErr = MachO::getCPUType(TT);
if (!FileCPUTypeOrErr)
return FileCPUTypeOrErr.takeError();
Expected<uint32_t> FileCPUSubTypeOrErr = MachO::getCPUSubType(TT);
if (!FileCPUSubTypeOrErr)
return FileCPUSubTypeOrErr.takeError();
// If -arch_only is specified then skip this file if it doesn't match
// the architecture specified.
if (!ArchType.empty() &&
!acceptFileArch(*FileCPUTypeOrErr, *FileCPUSubTypeOrErr, C)) {
return Error::success();
}
uint64_t FileCPUID = getCPUID(*FileCPUTypeOrErr, *FileCPUSubTypeOrErr);
Members[FileCPUID].push_back(std::move(Member));
return Error::success();
}
static Error addChildMember(MembersPerArchitectureMap &Members,
const object::Archive::Child &M, const Config &C) {
Expected<NewArchiveMember> NMOrErr =
NewArchiveMember::getOldMember(M, C.Deterministic);
if (!NMOrErr)
return NMOrErr.takeError();
file_magic Magic = identify_magic(NMOrErr->Buf->getBuffer());
if (Magic == file_magic::bitcode)
return verifyAndAddIRObject(Members, std::move(*NMOrErr), C);
if (Error E = verifyAndAddMachOObject(Members, std::move(*NMOrErr), C))
return E;
return Error::success();
}
static Error processArchive(MembersPerArchitectureMap &Members,
object::Archive &Lib, StringRef FileName,
const Config &C) {
Error Err = Error::success();
for (const object::Archive::Child &Child : Lib.children(Err))
if (Error E = addChildMember(Members, Child, C))
return createFileError(FileName, std::move(E));
if (Err)
return createFileError(FileName, std::move(Err));
return Error::success();
}
static Error
addArchiveMembers(MembersPerArchitectureMap &Members,
std::vector<std::unique_ptr<MemoryBuffer>> &ArchiveBuffers,
NewArchiveMember NM, StringRef FileName, const Config &C) {
Expected<std::unique_ptr<Archive>> LibOrErr =
object::Archive::create(NM.Buf->getMemBufferRef());
if (!LibOrErr)
return createFileError(FileName, LibOrErr.takeError());
if (Error E = processArchive(Members, **LibOrErr, FileName, C))
return E;
// Update vector ArchiveBuffers with the MemoryBuffers to transfer
// ownership.
ArchiveBuffers.push_back(std::move(NM.Buf));
return Error::success();
}
static Error addUniversalMembers(
MembersPerArchitectureMap &Members,
std::vector<std::unique_ptr<MemoryBuffer>> &UniversalBuffers,
NewArchiveMember NM, StringRef FileName, const Config &C) {
Expected<std::unique_ptr<MachOUniversalBinary>> BinaryOrErr =
MachOUniversalBinary::create(NM.Buf->getMemBufferRef());
if (!BinaryOrErr)
return createFileError(FileName, BinaryOrErr.takeError());
auto *UO = BinaryOrErr->get();
for (const MachOUniversalBinary::ObjectForArch &O : UO->objects()) {
Expected<std::unique_ptr<MachOObjectFile>> MachOObjOrErr =
O.getAsObjectFile();
if (MachOObjOrErr) {
NewArchiveMember NewMember =
NewArchiveMember(MachOObjOrErr->get()->getMemoryBufferRef());
NewMember.MemberName = sys::path::filename(NewMember.MemberName);
if (Error E = verifyAndAddMachOObject(Members, std::move(NewMember), C))
return E;
continue;
}
Expected<std::unique_ptr<IRObjectFile>> IRObjectOrError =
O.getAsIRObject(LLVMCtx);
if (IRObjectOrError) {
// A universal file member can be a MachOObjectFile, an IRObject or an
// Archive. In case we can successfully cast the member as an IRObject, it
// is safe to throw away the error generated due to casting the object as
// a MachOObjectFile.
consumeError(MachOObjOrErr.takeError());
NewArchiveMember NewMember =
NewArchiveMember(IRObjectOrError->get()->getMemoryBufferRef());
NewMember.MemberName = sys::path::filename(NewMember.MemberName);
if (Error E = verifyAndAddIRObject(Members, std::move(NewMember), C))
return E;
continue;
}
Expected<std::unique_ptr<Archive>> ArchiveOrError = O.getAsArchive();
if (ArchiveOrError) {
// A universal file member can be a MachOObjectFile, an IRObject or an
// Archive. In case we can successfully cast the member as an Archive, it
// is safe to throw away the error generated due to casting the object as
// a MachOObjectFile.
consumeError(MachOObjOrErr.takeError());
consumeError(IRObjectOrError.takeError());
if (Error E = processArchive(Members, **ArchiveOrError, FileName, C))
return E;
continue;
}
Error CombinedError = joinErrors(
ArchiveOrError.takeError(),
joinErrors(IRObjectOrError.takeError(), MachOObjOrErr.takeError()));
return createFileError(FileName, std::move(CombinedError));
}
// Update vector UniversalBuffers with the MemoryBuffers to transfer
// ownership.
UniversalBuffers.push_back(std::move(NM.Buf));
return Error::success();
}
static Error addMember(MembersPerArchitectureMap &Members,
std::vector<std::unique_ptr<MemoryBuffer>> &FileBuffers,
StringRef FileName, const Config &C) {
Expected<NewArchiveMember> NMOrErr =
NewArchiveMember::getFile(FileName, C.Deterministic);
if (!NMOrErr)
return createFileError(FileName, NMOrErr.takeError());
// For regular archives, use the basename of the object path for the member
// name.
NMOrErr->MemberName = sys::path::filename(NMOrErr->MemberName);
file_magic Magic = identify_magic(NMOrErr->Buf->getBuffer());
// Flatten archives.
if (Magic == file_magic::archive)
return addArchiveMembers(Members, FileBuffers, std::move(*NMOrErr),
FileName, C);
// Flatten universal files.
if (Magic == file_magic::macho_universal_binary)
return addUniversalMembers(Members, FileBuffers, std::move(*NMOrErr),
FileName, C);
// Bitcode files.
if (Magic == file_magic::bitcode)
return verifyAndAddIRObject(Members, std::move(*NMOrErr), C);
if (Error E = verifyAndAddMachOObject(Members, std::move(*NMOrErr), C))
return E;
return Error::success();
}
static Expected<SmallVector<Slice, 2>>
buildSlices(ArrayRef<OwningBinary<Archive>> OutputBinaries) {
SmallVector<Slice, 2> Slices;
for (const auto &OB : OutputBinaries) {
const Archive &A = *OB.getBinary();
Expected<Slice> ArchiveSlice = Slice::create(A, &LLVMCtx);
if (!ArchiveSlice)
return ArchiveSlice.takeError();
Slices.push_back(*ArchiveSlice);
}
return Slices;
}
static Error createStaticLibrary(const Config &C) {
MembersPerArchitectureMap NewMembers;
std::vector<std::unique_ptr<MemoryBuffer>> FileBuffers;
for (StringRef FileName : InputFiles)
if (Error E = addMember(NewMembers, FileBuffers, FileName, C))
return E;
if (!ArchType.empty()) {
uint64_t ArchCPUID = getCPUID(C.ArchCPUType, C.ArchCPUSubtype);
if (NewMembers.find(ArchCPUID) == NewMembers.end())
return createStringError(std::errc::invalid_argument,
"no library created (no object files in input "
"files matching -arch_only %s)",
ArchType.c_str());
}
if (NewMembers.size() == 1) {
if (Error E =
writeArchive(OutputFile, NewMembers.begin()->second,
/*WriteSymtab=*/true,
/*Kind=*/object::Archive::K_DARWIN, C.Deterministic,
/*Thin=*/false))
return E;
} else {
SmallVector<OwningBinary<Archive>, 2> OutputBinaries;
for (const std::pair<const uint64_t, std::vector<NewArchiveMember>> &M :
NewMembers) {
Expected<std::unique_ptr<MemoryBuffer>> OutputBufferOrErr =
writeArchiveToBuffer(M.second,
/*WriteSymtab=*/true,
/*Kind=*/object::Archive::K_DARWIN,
C.Deterministic,
/*Thin=*/false);
if (!OutputBufferOrErr)
return OutputBufferOrErr.takeError();
std::unique_ptr<MemoryBuffer> &OutputBuffer = OutputBufferOrErr.get();
Expected<std::unique_ptr<Archive>> ArchiveOrError =
Archive::create(OutputBuffer->getMemBufferRef());
if (!ArchiveOrError)
return ArchiveOrError.takeError();
std::unique_ptr<Archive> &A = ArchiveOrError.get();
OutputBinaries.push_back(
OwningBinary<Archive>(std::move(A), std::move(OutputBuffer)));
}
Expected<SmallVector<Slice, 2>> Slices = buildSlices(OutputBinaries);
if (!Slices)
return Slices.takeError();
llvm::stable_sort(*Slices);
if (Error E = writeUniversalBinary(*Slices, OutputFile))
return E;
}
return Error::success();
}
static Expected<Config> parseCommandLine(int Argc, char **Argv) {
Config C;
cl::ParseCommandLineOptions(Argc, Argv, "llvm-libtool-darwin\n");
if (LibraryOperation == Operation::None) {
if (!VersionOption) {
std::string Error;
raw_string_ostream Stream(Error);
LibraryOperation.error("must be specified", "", Stream);
return createStringError(std::errc::invalid_argument, Error.c_str());
}
return C;
}
if (OutputFile.empty()) {
std::string Error;
raw_string_ostream Stream(Error);
OutputFile.error("must be specified", "o", Stream);
return createStringError(std::errc::invalid_argument, Error.c_str());
}
if (DeterministicOption && NonDeterministicOption)
return createStringError(std::errc::invalid_argument,
"cannot specify both -D and -U flags");
else if (NonDeterministicOption)
C.Deterministic = false;
if (!Libraries.empty())
if (Error E = processCommandLineLibraries())
return std::move(E);
if (!FileList.empty())
if (Error E = processFileList())
return std::move(E);
if (InputFiles.empty())
return createStringError(std::errc::invalid_argument,
"no input files specified");
if (ArchType.getNumOccurrences()) {
if (Error E = validateArchitectureName(ArchType))
return std::move(E);
std::tie(C.ArchCPUType, C.ArchCPUSubtype) =
MachO::getCPUTypeFromArchitecture(
MachO::getArchitectureFromName(ArchType));
}
return C;
}
int main(int Argc, char **Argv) {
InitLLVM X(Argc, Argv);
cl::HideUnrelatedOptions({&LibtoolCategory, &getColorCategory()});
Expected<Config> ConfigOrErr = parseCommandLine(Argc, Argv);
if (!ConfigOrErr) {
WithColor::defaultErrorHandler(ConfigOrErr.takeError());
return EXIT_FAILURE;
}
if (VersionOption)
cl::PrintVersionMessage();
Config C = *ConfigOrErr;
switch (LibraryOperation) {
case Operation::None:
break;
case Operation::Static:
if (Error E = createStaticLibrary(C)) {
WithColor::defaultErrorHandler(std::move(E));
return EXIT_FAILURE;
}
break;
}
}
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