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//===- LibDriver.cpp - lib.exe-compatible driver --------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Defines an interface to a lib.exe-compatible driver that also understands
// bitcode files. Used by llvm-lib and lld-link /lib.
//
//===----------------------------------------------------------------------===//
#include "llvm/ToolDrivers/llvm-lib/LibDriver.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/BinaryFormat/Magic.h"
#include "llvm/Object/ArchiveWriter.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/StringSaver.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
enum {
OPT_INVALID = 0,
#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID,
#include "Options.inc"
#undef OPTION
};
#define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE;
#include "Options.inc"
#undef PREFIX
static const opt::OptTable::Info InfoTable[] = {
#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12) \
{X1, X2, X10, X11, OPT_##ID, opt::Option::KIND##Class, \
X9, X8, OPT_##GROUP, OPT_##ALIAS, X7, X12},
#include "Options.inc"
#undef OPTION
};
class LibOptTable : public opt::OptTable {
public:
LibOptTable() : OptTable(InfoTable, true) {}
};
}
static std::string getOutputPath(opt::InputArgList *Args,
const NewArchiveMember &FirstMember) {
if (auto *Arg = Args->getLastArg(OPT_out))
return Arg->getValue();
SmallString<128> Val = StringRef(FirstMember.Buf->getBufferIdentifier());
sys::path::replace_extension(Val, ".lib");
return Val.str();
}
static std::vector<StringRef> getSearchPaths(opt::InputArgList *Args,
StringSaver &Saver) {
std::vector<StringRef> Ret;
// Add current directory as first item of the search path.
Ret.push_back("");
// Add /libpath flags.
for (auto *Arg : Args->filtered(OPT_libpath))
Ret.push_back(Arg->getValue());
// Add $LIB.
Optional<std::string> EnvOpt = sys::Process::GetEnv("LIB");
if (!EnvOpt.hasValue())
return Ret;
StringRef Env = Saver.save(*EnvOpt);
while (!Env.empty()) {
StringRef Path;
std::tie(Path, Env) = Env.split(';');
Ret.push_back(Path);
}
return Ret;
}
static std::string findInputFile(StringRef File, ArrayRef<StringRef> Paths) {
for (StringRef Dir : Paths) {
SmallString<128> Path = Dir;
sys::path::append(Path, File);
if (sys::fs::exists(Path))
return Path.str().str();
}
return "";
}
static void fatalOpenError(llvm::Error E, Twine File) {
if (!E)
return;
handleAllErrors(std::move(E), [&](const llvm::ErrorInfoBase &EIB) {
llvm::errs() << "error opening '" << File << "': " << EIB.message() << '\n';
exit(1);
});
}
static void doList(opt::InputArgList& Args) {
// lib.exe prints the contents of the first archive file.
std::unique_ptr<MemoryBuffer> B;
for (auto *Arg : Args.filtered(OPT_INPUT)) {
// Create or open the archive object.
ErrorOr<std::unique_ptr<MemoryBuffer>> MaybeBuf =
MemoryBuffer::getFile(Arg->getValue(), -1, false);
fatalOpenError(errorCodeToError(MaybeBuf.getError()), Arg->getValue());
if (identify_magic(MaybeBuf.get()->getBuffer()) == file_magic::archive) {
B = std::move(MaybeBuf.get());
break;
}
}
// lib.exe doesn't print an error if no .lib files are passed.
if (!B)
return;
Error Err = Error::success();
object::Archive Archive(B.get()->getMemBufferRef(), Err);
fatalOpenError(std::move(Err), B->getBufferIdentifier());
for (auto &C : Archive.children(Err)) {
Expected<StringRef> NameOrErr = C.getName();
fatalOpenError(NameOrErr.takeError(), B->getBufferIdentifier());
StringRef Name = NameOrErr.get();
llvm::outs() << Name << '\n';
}
fatalOpenError(std::move(Err), B->getBufferIdentifier());
}
int llvm::libDriverMain(ArrayRef<const char *> ArgsArr) {
BumpPtrAllocator Alloc;
StringSaver Saver(Alloc);
// Parse command line arguments.
SmallVector<const char *, 20> NewArgs(ArgsArr.begin(), ArgsArr.end());
cl::ExpandResponseFiles(Saver, cl::TokenizeWindowsCommandLine, NewArgs);
ArgsArr = NewArgs;
LibOptTable Table;
unsigned MissingIndex;
unsigned MissingCount;
opt::InputArgList Args =
Table.ParseArgs(ArgsArr.slice(1), MissingIndex, MissingCount);
if (MissingCount) {
llvm::errs() << "missing arg value for \""
<< Args.getArgString(MissingIndex) << "\", expected "
<< MissingCount
<< (MissingCount == 1 ? " argument.\n" : " arguments.\n");
return 1;
}
for (auto *Arg : Args.filtered(OPT_UNKNOWN))
llvm::errs() << "ignoring unknown argument: " << Arg->getSpelling() << "\n";
// Handle /help
if (Args.hasArg(OPT_help)) {
Table.PrintHelp(outs(), "llvm-lib [options] file...", "LLVM Lib");
return 0;
}
// If no input files, silently do nothing to match lib.exe.
if (!Args.hasArgNoClaim(OPT_INPUT))
return 0;
if (Args.hasArg(OPT_lst)) {
doList(Args);
return 0;
}
std::vector<StringRef> SearchPaths = getSearchPaths(&Args, Saver);
// Create a NewArchiveMember for each input file.
std::vector<NewArchiveMember> Members;
for (auto *Arg : Args.filtered(OPT_INPUT)) {
std::string Path = findInputFile(Arg->getValue(), SearchPaths);
if (Path.empty()) {
llvm::errs() << Arg->getValue() << ": no such file or directory\n";
return 1;
}
Expected<NewArchiveMember> MOrErr =
NewArchiveMember::getFile(Saver.save(Path), /*Deterministic=*/true);
if (!MOrErr) {
handleAllErrors(MOrErr.takeError(), [&](const ErrorInfoBase &EIB) {
llvm::errs() << Arg->getValue() << ": " << EIB.message() << "\n";
});
return 1;
}
file_magic Magic = identify_magic(MOrErr->Buf->getBuffer());
if (Magic != file_magic::coff_object && Magic != file_magic::bitcode &&
Magic != file_magic::windows_resource) {
llvm::errs() << Arg->getValue()
<< ": not a COFF object, bitcode or resource file\n";
return 1;
}
Members.emplace_back(std::move(*MOrErr));
}
// Create an archive file.
std::string OutputPath = getOutputPath(&Args, Members[0]);
// llvm-lib uses relative paths for both regular and thin archives, unlike
// standard GNU ar, which only uses relative paths for thin archives and
// basenames for regular archives.
for (NewArchiveMember &Member : Members)
Member.MemberName =
Saver.save(computeArchiveRelativePath(OutputPath, Member.MemberName));
if (Error E =
writeArchive(OutputPath, Members,
/*WriteSymtab=*/true, object::Archive::K_GNU,
/*Deterministic*/ true, Args.hasArg(OPT_llvmlibthin))) {
handleAllErrors(std::move(E), [&](const ErrorInfoBase &EI) {
llvm::errs() << OutputPath << ": " << EI.message() << "\n";
});
return 1;
}
return 0;
}
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