1 //===- LibDriver.cpp - lib.exe-compatible driver --------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Defines an interface to a lib.exe-compatible driver that also understands 11 // bitcode files. Used by llvm-lib and lld-link /lib. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/ToolDrivers/llvm-lib/LibDriver.h" 16 #include "llvm/ADT/STLExtras.h" 17 #include "llvm/BinaryFormat/Magic.h" 18 #include "llvm/Object/ArchiveWriter.h" 19 #include "llvm/Option/Arg.h" 20 #include "llvm/Option/ArgList.h" 21 #include "llvm/Option/Option.h" 22 #include "llvm/Support/CommandLine.h" 23 #include "llvm/Support/Path.h" 24 #include "llvm/Support/Process.h" 25 #include "llvm/Support/StringSaver.h" 26 #include "llvm/Support/raw_ostream.h" 27 28 using namespace llvm; 29 30 namespace { 31 32 enum { 33 OPT_INVALID = 0, 34 #define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID, 35 #include "Options.inc" 36 #undef OPTION 37 }; 38 39 #define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE; 40 #include "Options.inc" 41 #undef PREFIX 42 43 static const opt::OptTable::Info InfoTable[] = { 44 #define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12) \ 45 {X1, X2, X10, X11, OPT_##ID, opt::Option::KIND##Class, \ 46 X9, X8, OPT_##GROUP, OPT_##ALIAS, X7, X12}, 47 #include "Options.inc" 48 #undef OPTION 49 }; 50 51 class LibOptTable : public opt::OptTable { 52 public: 53 LibOptTable() : OptTable(InfoTable, true) {} 54 }; 55 56 } 57 58 static std::string getOutputPath(opt::InputArgList *Args, 59 const NewArchiveMember &FirstMember) { 60 if (auto *Arg = Args->getLastArg(OPT_out)) 61 return Arg->getValue(); 62 SmallString<128> Val = StringRef(FirstMember.Buf->getBufferIdentifier()); 63 sys::path::replace_extension(Val, ".lib"); 64 return Val.str(); 65 } 66 67 static std::vector<StringRef> getSearchPaths(opt::InputArgList *Args, 68 StringSaver &Saver) { 69 std::vector<StringRef> Ret; 70 // Add current directory as first item of the search path. 71 Ret.push_back(""); 72 73 // Add /libpath flags. 74 for (auto *Arg : Args->filtered(OPT_libpath)) 75 Ret.push_back(Arg->getValue()); 76 77 // Add $LIB. 78 Optional<std::string> EnvOpt = sys::Process::GetEnv("LIB"); 79 if (!EnvOpt.hasValue()) 80 return Ret; 81 StringRef Env = Saver.save(*EnvOpt); 82 while (!Env.empty()) { 83 StringRef Path; 84 std::tie(Path, Env) = Env.split(';'); 85 Ret.push_back(Path); 86 } 87 return Ret; 88 } 89 90 static std::string findInputFile(StringRef File, ArrayRef<StringRef> Paths) { 91 for (StringRef Dir : Paths) { 92 SmallString<128> Path = Dir; 93 sys::path::append(Path, File); 94 if (sys::fs::exists(Path)) 95 return Path.str().str(); 96 } 97 return ""; 98 } 99 100 int llvm::libDriverMain(ArrayRef<const char *> ArgsArr) { 101 BumpPtrAllocator Alloc; 102 StringSaver Saver(Alloc); 103 104 // Parse command line arguments. 105 SmallVector<const char *, 20> NewArgs(ArgsArr.begin(), ArgsArr.end()); 106 cl::ExpandResponseFiles(Saver, cl::TokenizeWindowsCommandLine, NewArgs); 107 ArgsArr = NewArgs; 108 109 LibOptTable Table; 110 unsigned MissingIndex; 111 unsigned MissingCount; 112 opt::InputArgList Args = 113 Table.ParseArgs(ArgsArr.slice(1), MissingIndex, MissingCount); 114 if (MissingCount) { 115 llvm::errs() << "missing arg value for \"" 116 << Args.getArgString(MissingIndex) << "\", expected " 117 << MissingCount 118 << (MissingCount == 1 ? " argument.\n" : " arguments.\n"); 119 return 1; 120 } 121 for (auto *Arg : Args.filtered(OPT_UNKNOWN)) 122 llvm::errs() << "ignoring unknown argument: " << Arg->getSpelling() << "\n"; 123 124 // If no input files, silently do nothing to match lib.exe. 125 if (!Args.hasArgNoClaim(OPT_INPUT)) 126 return 0; 127 128 std::vector<StringRef> SearchPaths = getSearchPaths(&Args, Saver); 129 130 // Create a NewArchiveMember for each input file. 131 std::vector<NewArchiveMember> Members; 132 for (auto *Arg : Args.filtered(OPT_INPUT)) { 133 std::string Path = findInputFile(Arg->getValue(), SearchPaths); 134 if (Path.empty()) { 135 llvm::errs() << Arg->getValue() << ": no such file or directory\n"; 136 return 1; 137 } 138 139 Expected<NewArchiveMember> MOrErr = 140 NewArchiveMember::getFile(Saver.save(Path), /*Deterministic=*/true); 141 if (!MOrErr) { 142 handleAllErrors(MOrErr.takeError(), [&](const ErrorInfoBase &EIB) { 143 llvm::errs() << Arg->getValue() << ": " << EIB.message() << "\n"; 144 }); 145 return 1; 146 } 147 148 file_magic Magic = identify_magic(MOrErr->Buf->getBuffer()); 149 if (Magic != file_magic::coff_object && Magic != file_magic::bitcode && 150 Magic != file_magic::windows_resource) { 151 llvm::errs() << Arg->getValue() 152 << ": not a COFF object, bitcode or resource file\n"; 153 return 1; 154 } 155 Members.emplace_back(std::move(*MOrErr)); 156 } 157 158 // Create an archive file. 159 std::string OutputPath = getOutputPath(&Args, Members[0]); 160 std::error_code EC = 161 writeArchive(OutputPath, Members, 162 /*WriteSymtab=*/true, object::Archive::K_GNU, 163 /*Deterministic*/ true, Args.hasArg(OPT_llvmlibthin)); 164 165 if (EC) { 166 llvm::errs() << OutputPath << ": " << EC.message() << "\n"; 167 return 1; 168 } 169 170 return 0; 171 } 172