tools/llvm-objcopy/CopyConfig.cpp

   1 //===- CopyConfig.cpp -----------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "CopyConfig.h"
  10
  11 #include "llvm/ADT/Optional.h"
  12 #include "llvm/ADT/SmallVector.h"
  13 #include "llvm/ADT/StringRef.h"
  14 #include "llvm/ADT/StringSet.h"
  15 #include "llvm/Option/Arg.h"
  16 #include "llvm/Option/ArgList.h"
  17 #include "llvm/Support/CRC.h"
  18 #include "llvm/Support/CommandLine.h"
  19 #include "llvm/Support/Compression.h"
  20 #include "llvm/Support/Errc.h"
  21 #include "llvm/Support/MemoryBuffer.h"
  22 #include "llvm/Support/StringSaver.h"
  23 #include <memory>
  24
  25 namespace llvm {
  26 namespace objcopy {
  27
  28 namespace {
  29 enum ObjcopyID {
  30   OBJCOPY_INVALID = 0, // This is not an option ID.
  31 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,  \
  32                HELPTEXT, METAVAR, VALUES)                                      \
  33   OBJCOPY_##ID,
  34 #include "ObjcopyOpts.inc"
  35 #undef OPTION
  36 };
  37
  38 #define PREFIX(NAME, VALUE) const char *const OBJCOPY_##NAME[] = VALUE;
  39 #include "ObjcopyOpts.inc"
  40 #undef PREFIX
  41
  42 static const opt::OptTable::Info ObjcopyInfoTable[] = {
  43 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,  \
  44                HELPTEXT, METAVAR, VALUES)                                      \
  45   {OBJCOPY_##PREFIX,                                                           \
  46    NAME,                                                                       \
  47    HELPTEXT,                                                                   \
  48    METAVAR,                                                                    \
  49    OBJCOPY_##ID,                                                               \
  50    opt::Option::KIND##Class,                                                   \
  51    PARAM,                                                                      \
  52    FLAGS,                                                                      \
  53    OBJCOPY_##GROUP,                                                            \
  54    OBJCOPY_##ALIAS,                                                            \
  55    ALIASARGS,                                                                  \
  56    VALUES},
  57 #include "ObjcopyOpts.inc"
  58 #undef OPTION
  59 };
  60
  61 class ObjcopyOptTable : public opt::OptTable {
  62 public:
  63   ObjcopyOptTable() : OptTable(ObjcopyInfoTable) {}
  64 };
  65
  66 enum StripID {
  67   STRIP_INVALID = 0, // This is not an option ID.
  68 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,  \
  69                HELPTEXT, METAVAR, VALUES)                                      \
  70   STRIP_##ID,
  71 #include "StripOpts.inc"
  72 #undef OPTION
  73 };
  74
  75 #define PREFIX(NAME, VALUE) const char *const STRIP_##NAME[] = VALUE;
  76 #include "StripOpts.inc"
  77 #undef PREFIX
  78
  79 static const opt::OptTable::Info StripInfoTable[] = {
  80 #define OPTION(PREFIX, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,  \
  81                HELPTEXT, METAVAR, VALUES)                                      \
  82   {STRIP_##PREFIX, NAME,       HELPTEXT,                                       \
  83    METAVAR,        STRIP_##ID, opt::Option::KIND##Class,                       \
  84    PARAM,          FLAGS,      STRIP_##GROUP,                                  \
  85    STRIP_##ALIAS,  ALIASARGS,  VALUES},
  86 #include "StripOpts.inc"
  87 #undef OPTION
  88 };
  89
  90 class StripOptTable : public opt::OptTable {
  91 public:
  92   StripOptTable() : OptTable(StripInfoTable) {}
  93 };
  94
  95 } // namespace
  96
  97 static SectionFlag parseSectionRenameFlag(StringRef SectionName) {
  98   return llvm::StringSwitch<SectionFlag>(SectionName)
  99       .CaseLower("alloc", SectionFlag::SecAlloc)
 100       .CaseLower("load", SectionFlag::SecLoad)
 101       .CaseLower("noload", SectionFlag::SecNoload)
 102       .CaseLower("readonly", SectionFlag::SecReadonly)
 103       .CaseLower("debug", SectionFlag::SecDebug)
 104       .CaseLower("code", SectionFlag::SecCode)
 105       .CaseLower("data", SectionFlag::SecData)
 106       .CaseLower("rom", SectionFlag::SecRom)
 107       .CaseLower("merge", SectionFlag::SecMerge)
 108       .CaseLower("strings", SectionFlag::SecStrings)
 109       .CaseLower("contents", SectionFlag::SecContents)
 110       .CaseLower("share", SectionFlag::SecShare)
 111       .Default(SectionFlag::SecNone);
 112 }
 113
 114 static Expected<SectionFlag>
 115 parseSectionFlagSet(ArrayRef<StringRef> SectionFlags) {
 116   SectionFlag ParsedFlags = SectionFlag::SecNone;
 117   for (StringRef Flag : SectionFlags) {
 118     SectionFlag ParsedFlag = parseSectionRenameFlag(Flag);
 119     if (ParsedFlag == SectionFlag::SecNone)
 120       return createStringError(
 121           errc::invalid_argument,
 122           "unrecognized section flag '%s'. Flags supported for GNU "
 123           "compatibility: alloc, load, noload, readonly, debug, code, data, "
 124           "rom, share, contents, merge, strings",
 125           Flag.str().c_str());
 126     ParsedFlags |= ParsedFlag;
 127   }
 128
 129   return ParsedFlags;
 130 }
 131
 132 static Expected<SectionRename> parseRenameSectionValue(StringRef FlagValue) {
 133   if (!FlagValue.contains('='))
 134     return createStringError(errc::invalid_argument,
 135                              "bad format for --rename-section: missing '='");
 136
 137   // Initial split: ".foo" = ".bar,f1,f2,..."
 138   auto Old2New = FlagValue.split('=');
 139   SectionRename SR;
 140   SR.OriginalName = Old2New.first;
 141
 142   // Flags split: ".bar" "f1" "f2" ...
 143   SmallVector<StringRef, 6> NameAndFlags;
 144   Old2New.second.split(NameAndFlags, ',');
 145   SR.NewName = NameAndFlags[0];
 146
 147   if (NameAndFlags.size() > 1) {
 148     Expected<SectionFlag> ParsedFlagSet =
 149         parseSectionFlagSet(makeArrayRef(NameAndFlags).drop_front());
 150     if (!ParsedFlagSet)
 151       return ParsedFlagSet.takeError();
 152     SR.NewFlags = *ParsedFlagSet;
 153   }
 154
 155   return SR;
 156 }
 157
 158 static Expected<std::pair<StringRef, uint64_t>>
 159 parseSetSectionAlignment(StringRef FlagValue) {
 160   if (!FlagValue.contains('='))
 161     return createStringError(
 162         errc::invalid_argument,
 163         "bad format for --set-section-alignment: missing '='");
 164   auto Split = StringRef(FlagValue).split('=');
 165   if (Split.first.empty())
 166     return createStringError(
 167         errc::invalid_argument,
 168         "bad format for --set-section-alignment: missing section name");
 169   uint64_t NewAlign;
 170   if (Split.second.getAsInteger(0, NewAlign))
 171     return createStringError(errc::invalid_argument,
 172                              "invalid alignment for --set-section-alignment: '%s'",
 173                              Split.second.str().c_str());
 174   return std::make_pair(Split.first, NewAlign);
 175 }
 176
 177 static Expected<SectionFlagsUpdate>
 178 parseSetSectionFlagValue(StringRef FlagValue) {
 179   if (!StringRef(FlagValue).contains('='))
 180     return createStringError(errc::invalid_argument,
 181                              "bad format for --set-section-flags: missing '='");
 182
 183   // Initial split: ".foo" = "f1,f2,..."
 184   auto Section2Flags = StringRef(FlagValue).split('=');
 185   SectionFlagsUpdate SFU;
 186   SFU.Name = Section2Flags.first;
 187
 188   // Flags split: "f1" "f2" ...
 189   SmallVector<StringRef, 6> SectionFlags;
 190   Section2Flags.second.split(SectionFlags, ',');
 191   Expected<SectionFlag> ParsedFlagSet = parseSectionFlagSet(SectionFlags);
 192   if (!ParsedFlagSet)
 193     return ParsedFlagSet.takeError();
 194   SFU.NewFlags = *ParsedFlagSet;
 195
 196   return SFU;
 197 }
 198
 199 struct TargetInfo {
 200   FileFormat Format;
 201   MachineInfo Machine;
 202 };
 203
 204 // FIXME: consolidate with the bfd parsing used by lld.
 205 static const StringMap<MachineInfo> TargetMap{
 206     // Name, {EMachine, 64bit, LittleEndian}
 207     // x86
 208     {"elf32-i386", {ELF::EM_386, false, true}},
 209     {"elf32-x86-64", {ELF::EM_X86_64, false, true}},
 210     {"elf64-x86-64", {ELF::EM_X86_64, true, true}},
 211     // Intel MCU
 212     {"elf32-iamcu", {ELF::EM_IAMCU, false, true}},
 213     // ARM
 214     {"elf32-littlearm", {ELF::EM_ARM, false, true}},
 215     // ARM AArch64
 216     {"elf64-aarch64", {ELF::EM_AARCH64, true, true}},
 217     {"elf64-littleaarch64", {ELF::EM_AARCH64, true, true}},
 218     // RISC-V
 219     {"elf32-littleriscv", {ELF::EM_RISCV, false, true}},
 220     {"elf64-littleriscv", {ELF::EM_RISCV, true, true}},
 221     // PowerPC
 222     {"elf32-powerpc", {ELF::EM_PPC, false, false}},
 223     {"elf32-powerpcle", {ELF::EM_PPC, false, true}},
 224     {"elf64-powerpc", {ELF::EM_PPC64, true, false}},
 225     {"elf64-powerpcle", {ELF::EM_PPC64, true, true}},
 226     // MIPS
 227     {"elf32-bigmips", {ELF::EM_MIPS, false, false}},
 228     {"elf32-ntradbigmips", {ELF::EM_MIPS, false, false}},
 229     {"elf32-ntradlittlemips", {ELF::EM_MIPS, false, true}},
 230     {"elf32-tradbigmips", {ELF::EM_MIPS, false, false}},
 231     {"elf32-tradlittlemips", {ELF::EM_MIPS, false, true}},
 232     {"elf64-tradbigmips", {ELF::EM_MIPS, true, false}},
 233     {"elf64-tradlittlemips", {ELF::EM_MIPS, true, true}},
 234     // SPARC
 235     {"elf32-sparc", {ELF::EM_SPARC, false, false}},
 236     {"elf32-sparcel", {ELF::EM_SPARC, false, true}},
 237 };
 238
 239 static Expected<TargetInfo>
 240 getOutputTargetInfoByTargetName(StringRef TargetName) {
 241   StringRef OriginalTargetName = TargetName;
 242   bool IsFreeBSD = TargetName.consume_back("-freebsd");
 243   auto Iter = TargetMap.find(TargetName);
 244   if (Iter == std::end(TargetMap))
 245     return createStringError(errc::invalid_argument,
 246                              "invalid output format: '%s'",
 247                              OriginalTargetName.str().c_str());
 248   MachineInfo MI = Iter->getValue();
 249   if (IsFreeBSD)
 250     MI.OSABI = ELF::ELFOSABI_FREEBSD;
 251
 252   FileFormat Format;
 253   if (TargetName.startswith("elf"))
 254     Format = FileFormat::ELF;
 255   else
 256     // This should never happen because `TargetName` is valid (it certainly
 257     // exists in the TargetMap).
 258     llvm_unreachable("unknown target prefix");
 259
 260   return {TargetInfo{Format, MI}};
 261 }
 262
 263 static Error addSymbolsFromFile(NameMatcher &Symbols, BumpPtrAllocator &Alloc,
 264                                 StringRef Filename, bool UseRegex) {
 265   StringSaver Saver(Alloc);
 266   SmallVector<StringRef, 16> Lines;
 267   auto BufOrErr = MemoryBuffer::getFile(Filename);
 268   if (!BufOrErr)
 269     return createFileError(Filename, BufOrErr.getError());
 270
 271   BufOrErr.get()->getBuffer().split(Lines, '\n');
 272   for (StringRef Line : Lines) {
 273     // Ignore everything after '#', trim whitespace, and only add the symbol if
 274     // it's not empty.
 275     auto TrimmedLine = Line.split('#').first.trim();
 276     if (!TrimmedLine.empty())
 277       Symbols.addMatcher({Saver.save(TrimmedLine), UseRegex});
 278   }
 279
 280   return Error::success();
 281 }
 282
 283 NameOrRegex::NameOrRegex(StringRef Pattern, bool IsRegex) {
 284   if (!IsRegex) {
 285     Name = Pattern;
 286     return;
 287   }
 288
 289   SmallVector<char, 32> Data;
 290   R = std::make_shared<Regex>(
 291       ("^" + Pattern.ltrim('^').rtrim('$') + "$").toStringRef(Data));
 292 }
 293
 294 static Error addSymbolsToRenameFromFile(StringMap<StringRef> &SymbolsToRename,
 295                                         BumpPtrAllocator &Alloc,
 296                                         StringRef Filename) {
 297   StringSaver Saver(Alloc);
 298   SmallVector<StringRef, 16> Lines;
 299   auto BufOrErr = MemoryBuffer::getFile(Filename);
 300   if (!BufOrErr)
 301     return createFileError(Filename, BufOrErr.getError());
 302
 303   BufOrErr.get()->getBuffer().split(Lines, '\n');
 304   size_t NumLines = Lines.size();
 305   for (size_t LineNo = 0; LineNo < NumLines; ++LineNo) {
 306     StringRef TrimmedLine = Lines[LineNo].split('#').first.trim();
 307     if (TrimmedLine.empty())
 308       continue;
 309
 310     std::pair<StringRef, StringRef> Pair = Saver.save(TrimmedLine).split(' ');
 311     StringRef NewName = Pair.second.trim();
 312     if (NewName.empty())
 313       return createStringError(errc::invalid_argument,
 314                                "%s:%zu: missing new symbol name",
 315                                Filename.str().c_str(), LineNo + 1);
 316     SymbolsToRename.insert({Pair.first, NewName});
 317   }
 318   return Error::success();
 319 }
 320
 321 template <class T> static ErrorOr<T> getAsInteger(StringRef Val) {
 322   T Result;
 323   if (Val.getAsInteger(0, Result))
 324     return errc::invalid_argument;
 325   return Result;
 326 }
 327
 328 static void printHelp(const opt::OptTable &OptTable, raw_ostream &OS,
 329                       StringRef ToolName) {
 330   OptTable.PrintHelp(OS, (ToolName + " input [output]").str().c_str(),
 331                      (ToolName + " tool").str().c_str());
 332   // TODO: Replace this with libOption call once it adds extrahelp support.
 333   // The CommandLine library has a cl::extrahelp class to support this,
 334   // but libOption does not have that yet.
 335   OS << "\nPass @FILE as argument to read options from FILE.\n";
 336 }
 337
 338 // ParseObjcopyOptions returns the config and sets the input arguments. If a
 339 // help flag is set then ParseObjcopyOptions will print the help messege and
 340 // exit.
 341 Expected<DriverConfig> parseObjcopyOptions(ArrayRef<const char *> ArgsArr) {
 342   DriverConfig DC;
 343   ObjcopyOptTable T;
 344   unsigned MissingArgumentIndex, MissingArgumentCount;
 345   llvm::opt::InputArgList InputArgs =
 346       T.ParseArgs(ArgsArr, MissingArgumentIndex, MissingArgumentCount);
 347
 348   if (InputArgs.size() == 0) {
 349     printHelp(T, errs(), "llvm-objcopy");
 350     exit(1);
 351   }
 352
 353   if (InputArgs.hasArg(OBJCOPY_help)) {
 354     printHelp(T, outs(), "llvm-objcopy");
 355     exit(0);
 356   }
 357
 358   if (InputArgs.hasArg(OBJCOPY_version)) {
 359     outs() << "llvm-objcopy, compatible with GNU objcopy\n";
 360     cl::PrintVersionMessage();
 361     exit(0);
 362   }
 363
 364   SmallVector<const char *, 2> Positional;
 365
 366   for (auto Arg : InputArgs.filtered(OBJCOPY_UNKNOWN))
 367     return createStringError(errc::invalid_argument, "unknown argument '%s'",
 368                              Arg->getAsString(InputArgs).c_str());
 369
 370   for (auto Arg : InputArgs.filtered(OBJCOPY_INPUT))
 371     Positional.push_back(Arg->getValue());
 372
 373   if (Positional.empty())
 374     return createStringError(errc::invalid_argument, "no input file specified");
 375
 376   if (Positional.size() > 2)
 377     return createStringError(errc::invalid_argument,
 378                              "too many positional arguments");
 379
 380   CopyConfig Config;
 381   Config.InputFilename = Positional[0];
 382   Config.OutputFilename = Positional[Positional.size() == 1 ? 0 : 1];
 383   if (InputArgs.hasArg(OBJCOPY_target) &&
 384       (InputArgs.hasArg(OBJCOPY_input_target) ||
 385        InputArgs.hasArg(OBJCOPY_output_target)))
 386     return createStringError(
 387         errc::invalid_argument,
 388         "--target cannot be used with --input-target or --output-target");
 389
 390   bool UseRegex = InputArgs.hasArg(OBJCOPY_regex);
 391   StringRef InputFormat, OutputFormat;
 392   if (InputArgs.hasArg(OBJCOPY_target)) {
 393     InputFormat = InputArgs.getLastArgValue(OBJCOPY_target);
 394     OutputFormat = InputArgs.getLastArgValue(OBJCOPY_target);
 395   } else {
 396     InputFormat = InputArgs.getLastArgValue(OBJCOPY_input_target);
 397     OutputFormat = InputArgs.getLastArgValue(OBJCOPY_output_target);
 398   }
 399
 400   // FIXME:  Currently, we ignore the target for non-binary/ihex formats
 401   // explicitly specified by -I option (e.g. -Ielf32-x86-64) and guess the
 402   // format by llvm::object::createBinary regardless of the option value.
 403   Config.InputFormat = StringSwitch<FileFormat>(InputFormat)
 404                            .Case("binary", FileFormat::Binary)
 405                            .Case("ihex", FileFormat::IHex)
 406                            .Default(FileFormat::Unspecified);
 407
 408   if (InputArgs.hasArg(OBJCOPY_new_symbol_visibility))
 409     Config.NewSymbolVisibility =
 410         InputArgs.getLastArgValue(OBJCOPY_new_symbol_visibility);
 411
 412   Config.OutputFormat = StringSwitch<FileFormat>(OutputFormat)
 413                             .Case("binary", FileFormat::Binary)
 414                             .Case("ihex", FileFormat::IHex)
 415                             .Default(FileFormat::Unspecified);
 416   if (Config.OutputFormat == FileFormat::Unspecified) {
 417     if (OutputFormat.empty()) {
 418       Config.OutputFormat = Config.InputFormat;
 419     } else {
 420       Expected<TargetInfo> Target =
 421           getOutputTargetInfoByTargetName(OutputFormat);
 422       if (!Target)
 423         return Target.takeError();
 424       Config.OutputFormat = Target->Format;
 425       Config.OutputArch = Target->Machine;
 426     }
 427   }
 428
 429   if (auto Arg = InputArgs.getLastArg(OBJCOPY_compress_debug_sections,
 430                                       OBJCOPY_compress_debug_sections_eq)) {
 431     Config.CompressionType = DebugCompressionType::Z;
 432
 433     if (Arg->getOption().getID() == OBJCOPY_compress_debug_sections_eq) {
 434       Config.CompressionType =
 435           StringSwitch<DebugCompressionType>(
 436               InputArgs.getLastArgValue(OBJCOPY_compress_debug_sections_eq))
 437               .Case("zlib-gnu", DebugCompressionType::GNU)
 438               .Case("zlib", DebugCompressionType::Z)
 439               .Default(DebugCompressionType::None);
 440       if (Config.CompressionType == DebugCompressionType::None)
 441         return createStringError(
 442             errc::invalid_argument,
 443             "invalid or unsupported --compress-debug-sections format: %s",
 444             InputArgs.getLastArgValue(OBJCOPY_compress_debug_sections_eq)
 445                 .str()
 446                 .c_str());
 447     }
 448     if (!zlib::isAvailable())
 449       return createStringError(
 450           errc::invalid_argument,
 451           "LLVM was not compiled with LLVM_ENABLE_ZLIB: can not compress");
 452   }
 453
 454   Config.AddGnuDebugLink = InputArgs.getLastArgValue(OBJCOPY_add_gnu_debuglink);
 455   // The gnu_debuglink's target is expected to not change or else its CRC would
 456   // become invalidated and get rejected. We can avoid recalculating the
 457   // checksum for every target file inside an archive by precomputing the CRC
 458   // here. This prevents a significant amount of I/O.
 459   if (!Config.AddGnuDebugLink.empty()) {
 460     auto DebugOrErr = MemoryBuffer::getFile(Config.AddGnuDebugLink);
 461     if (!DebugOrErr)
 462       return createFileError(Config.AddGnuDebugLink, DebugOrErr.getError());
 463     auto Debug = std::move(*DebugOrErr);
 464     Config.GnuDebugLinkCRC32 =
 465         llvm::crc32(arrayRefFromStringRef(Debug->getBuffer()));
 466   }
 467   Config.BuildIdLinkDir = InputArgs.getLastArgValue(OBJCOPY_build_id_link_dir);
 468   if (InputArgs.hasArg(OBJCOPY_build_id_link_input))
 469     Config.BuildIdLinkInput =
 470         InputArgs.getLastArgValue(OBJCOPY_build_id_link_input);
 471   if (InputArgs.hasArg(OBJCOPY_build_id_link_output))
 472     Config.BuildIdLinkOutput =
 473         InputArgs.getLastArgValue(OBJCOPY_build_id_link_output);
 474   Config.SplitDWO = InputArgs.getLastArgValue(OBJCOPY_split_dwo);
 475   Config.SymbolsPrefix = InputArgs.getLastArgValue(OBJCOPY_prefix_symbols);
 476   Config.AllocSectionsPrefix =
 477       InputArgs.getLastArgValue(OBJCOPY_prefix_alloc_sections);
 478   if (auto Arg = InputArgs.getLastArg(OBJCOPY_extract_partition))
 479     Config.ExtractPartition = Arg->getValue();
 480
 481   for (auto Arg : InputArgs.filtered(OBJCOPY_redefine_symbol)) {
 482     if (!StringRef(Arg->getValue()).contains('='))
 483       return createStringError(errc::invalid_argument,
 484                                "bad format for --redefine-sym");
 485     auto Old2New = StringRef(Arg->getValue()).split('=');
 486     if (!Config.SymbolsToRename.insert(Old2New).second)
 487       return createStringError(errc::invalid_argument,
 488                                "multiple redefinition of symbol '%s'",
 489                                Old2New.first.str().c_str());
 490   }
 491
 492   for (auto Arg : InputArgs.filtered(OBJCOPY_redefine_symbols))
 493     if (Error E = addSymbolsToRenameFromFile(Config.SymbolsToRename, DC.Alloc,
 494                                              Arg->getValue()))
 495       return std::move(E);
 496
 497   for (auto Arg : InputArgs.filtered(OBJCOPY_rename_section)) {
 498     Expected<SectionRename> SR =
 499         parseRenameSectionValue(StringRef(Arg->getValue()));
 500     if (!SR)
 501       return SR.takeError();
 502     if (!Config.SectionsToRename.try_emplace(SR->OriginalName, *SR).second)
 503       return createStringError(errc::invalid_argument,
 504                                "multiple renames of section '%s'",
 505                                SR->OriginalName.str().c_str());
 506   }
 507   for (auto Arg : InputArgs.filtered(OBJCOPY_set_section_alignment)) {
 508     Expected<std::pair<StringRef, uint64_t>> NameAndAlign =
 509         parseSetSectionAlignment(Arg->getValue());
 510     if (!NameAndAlign)
 511       return NameAndAlign.takeError();
 512     Config.SetSectionAlignment[NameAndAlign->first] = NameAndAlign->second;
 513   }
 514   for (auto Arg : InputArgs.filtered(OBJCOPY_set_section_flags)) {
 515     Expected<SectionFlagsUpdate> SFU =
 516         parseSetSectionFlagValue(Arg->getValue());
 517     if (!SFU)
 518       return SFU.takeError();
 519     if (!Config.SetSectionFlags.try_emplace(SFU->Name, *SFU).second)
 520       return createStringError(
 521           errc::invalid_argument,
 522           "--set-section-flags set multiple times for section '%s'",
 523           SFU->Name.str().c_str());
 524   }
 525   // Prohibit combinations of --set-section-flags when the section name is used
 526   // by --rename-section, either as a source or a destination.
 527   for (const auto &E : Config.SectionsToRename) {
 528     const SectionRename &SR = E.second;
 529     if (Config.SetSectionFlags.count(SR.OriginalName))
 530       return createStringError(
 531           errc::invalid_argument,
 532           "--set-section-flags=%s conflicts with --rename-section=%s=%s",
 533           SR.OriginalName.str().c_str(), SR.OriginalName.str().c_str(),
 534           SR.NewName.str().c_str());
 535     if (Config.SetSectionFlags.count(SR.NewName))
 536       return createStringError(
 537           errc::invalid_argument,
 538           "--set-section-flags=%s conflicts with --rename-section=%s=%s",
 539           SR.NewName.str().c_str(), SR.OriginalName.str().c_str(),
 540           SR.NewName.str().c_str());
 541   }
 542
 543   for (auto Arg : InputArgs.filtered(OBJCOPY_remove_section))
 544     Config.ToRemove.addMatcher({Arg->getValue(), UseRegex});
 545   for (auto Arg : InputArgs.filtered(OBJCOPY_keep_section))
 546     Config.KeepSection.addMatcher({Arg->getValue(), UseRegex});
 547   for (auto Arg : InputArgs.filtered(OBJCOPY_only_section))
 548     Config.OnlySection.addMatcher({Arg->getValue(), UseRegex});
 549   for (auto Arg : InputArgs.filtered(OBJCOPY_add_section)) {
 550     StringRef ArgValue(Arg->getValue());
 551     if (!ArgValue.contains('='))
 552       return createStringError(errc::invalid_argument,
 553                                "bad format for --add-section: missing '='");
 554     if (ArgValue.split("=").second.empty())
 555       return createStringError(
 556           errc::invalid_argument,
 557           "bad format for --add-section: missing file name");
 558     Config.AddSection.push_back(ArgValue);
 559   }
 560   for (auto Arg : InputArgs.filtered(OBJCOPY_dump_section))
 561     Config.DumpSection.push_back(Arg->getValue());
 562   Config.StripAll = InputArgs.hasArg(OBJCOPY_strip_all);
 563   Config.StripAllGNU = InputArgs.hasArg(OBJCOPY_strip_all_gnu);
 564   Config.StripDebug = InputArgs.hasArg(OBJCOPY_strip_debug);
 565   Config.StripDWO = InputArgs.hasArg(OBJCOPY_strip_dwo);
 566   Config.StripSections = InputArgs.hasArg(OBJCOPY_strip_sections);
 567   Config.StripNonAlloc = InputArgs.hasArg(OBJCOPY_strip_non_alloc);
 568   Config.StripUnneeded = InputArgs.hasArg(OBJCOPY_strip_unneeded);
 569   Config.ExtractDWO = InputArgs.hasArg(OBJCOPY_extract_dwo);
 570   Config.ExtractMainPartition =
 571       InputArgs.hasArg(OBJCOPY_extract_main_partition);
 572   Config.LocalizeHidden = InputArgs.hasArg(OBJCOPY_localize_hidden);
 573   Config.Weaken = InputArgs.hasArg(OBJCOPY_weaken);
 574   if (InputArgs.hasArg(OBJCOPY_discard_all, OBJCOPY_discard_locals))
 575     Config.DiscardMode =
 576         InputArgs.hasFlag(OBJCOPY_discard_all, OBJCOPY_discard_locals)
 577             ? DiscardType::All
 578             : DiscardType::Locals;
 579   Config.OnlyKeepDebug = InputArgs.hasArg(OBJCOPY_only_keep_debug);
 580   Config.KeepFileSymbols = InputArgs.hasArg(OBJCOPY_keep_file_symbols);
 581   Config.DecompressDebugSections =
 582       InputArgs.hasArg(OBJCOPY_decompress_debug_sections);
 583   if (Config.DiscardMode == DiscardType::All)
 584     Config.StripDebug = true;
 585   for (auto Arg : InputArgs.filtered(OBJCOPY_localize_symbol))
 586     Config.SymbolsToLocalize.addMatcher({Arg->getValue(), UseRegex});
 587   for (auto Arg : InputArgs.filtered(OBJCOPY_localize_symbols))
 588     if (Error E = addSymbolsFromFile(Config.SymbolsToLocalize, DC.Alloc,
 589                                      Arg->getValue(), UseRegex))
 590       return std::move(E);
 591   for (auto Arg : InputArgs.filtered(OBJCOPY_keep_global_symbol))
 592     Config.SymbolsToKeepGlobal.addMatcher({Arg->getValue(), UseRegex});
 593   for (auto Arg : InputArgs.filtered(OBJCOPY_keep_global_symbols))
 594     if (Error E = addSymbolsFromFile(Config.SymbolsToKeepGlobal, DC.Alloc,
 595                                      Arg->getValue(), UseRegex))
 596       return std::move(E);
 597   for (auto Arg : InputArgs.filtered(OBJCOPY_globalize_symbol))
 598     Config.SymbolsToGlobalize.addMatcher({Arg->getValue(), UseRegex});
 599   for (auto Arg : InputArgs.filtered(OBJCOPY_globalize_symbols))
 600     if (Error E = addSymbolsFromFile(Config.SymbolsToGlobalize, DC.Alloc,
 601                                      Arg->getValue(), UseRegex))
 602       return std::move(E);
 603   for (auto Arg : InputArgs.filtered(OBJCOPY_weaken_symbol))
 604     Config.SymbolsToWeaken.addMatcher({Arg->getValue(), UseRegex});
 605   for (auto Arg : InputArgs.filtered(OBJCOPY_weaken_symbols))
 606     if (Error E = addSymbolsFromFile(Config.SymbolsToWeaken, DC.Alloc,
 607                                      Arg->getValue(), UseRegex))
 608       return std::move(E);
 609   for (auto Arg : InputArgs.filtered(OBJCOPY_strip_symbol))
 610     Config.SymbolsToRemove.addMatcher({Arg->getValue(), UseRegex});
 611   for (auto Arg : InputArgs.filtered(OBJCOPY_strip_symbols))
 612     if (Error E = addSymbolsFromFile(Config.SymbolsToRemove, DC.Alloc,
 613                                      Arg->getValue(), UseRegex))
 614       return std::move(E);
 615   for (auto Arg : InputArgs.filtered(OBJCOPY_strip_unneeded_symbol))
 616     Config.UnneededSymbolsToRemove.addMatcher({Arg->getValue(), UseRegex});
 617   for (auto Arg : InputArgs.filtered(OBJCOPY_strip_unneeded_symbols))
 618     if (Error E = addSymbolsFromFile(Config.UnneededSymbolsToRemove, DC.Alloc,
 619                                      Arg->getValue(), UseRegex))
 620       return std::move(E);
 621   for (auto Arg : InputArgs.filtered(OBJCOPY_keep_symbol))
 622     Config.SymbolsToKeep.addMatcher({Arg->getValue(), UseRegex});
 623   for (auto Arg : InputArgs.filtered(OBJCOPY_keep_symbols))
 624     if (Error E = addSymbolsFromFile(Config.SymbolsToKeep, DC.Alloc,
 625                                      Arg->getValue(), UseRegex))
 626       return std::move(E);
 627   for (auto Arg : InputArgs.filtered(OBJCOPY_add_symbol))
 628     Config.SymbolsToAdd.push_back(Arg->getValue());
 629
 630   Config.AllowBrokenLinks = InputArgs.hasArg(OBJCOPY_allow_broken_links);
 631
 632   Config.DeterministicArchives = InputArgs.hasFlag(
 633       OBJCOPY_enable_deterministic_archives,
 634       OBJCOPY_disable_deterministic_archives, /*default=*/true);
 635
 636   Config.PreserveDates = InputArgs.hasArg(OBJCOPY_preserve_dates);
 637
 638   if (Config.PreserveDates &&
 639       (Config.OutputFilename == "-" || Config.InputFilename == "-"))
 640     return createStringError(errc::invalid_argument,
 641                              "--preserve-dates requires a file");
 642
 643   for (auto Arg : InputArgs)
 644     if (Arg->getOption().matches(OBJCOPY_set_start)) {
 645       auto EAddr = getAsInteger<uint64_t>(Arg->getValue());
 646       if (!EAddr)
 647         return createStringError(
 648             EAddr.getError(), "bad entry point address: '%s'", Arg->getValue());
 649
 650       Config.EntryExpr = [EAddr](uint64_t) { return *EAddr; };
 651     } else if (Arg->getOption().matches(OBJCOPY_change_start)) {
 652       auto EIncr = getAsInteger<int64_t>(Arg->getValue());
 653       if (!EIncr)
 654         return createStringError(EIncr.getError(),
 655                                  "bad entry point increment: '%s'",
 656                                  Arg->getValue());
 657       auto Expr = Config.EntryExpr ? std::move(Config.EntryExpr)
 658                                    : [](uint64_t A) { return A; };
 659       Config.EntryExpr = [Expr, EIncr](uint64_t EAddr) {
 660         return Expr(EAddr) + *EIncr;
 661       };
 662     }
 663
 664   if (Config.DecompressDebugSections &&
 665       Config.CompressionType != DebugCompressionType::None) {
 666     return createStringError(
 667         errc::invalid_argument,
 668         "cannot specify both --compress-debug-sections and "
 669         "--decompress-debug-sections");
 670   }
 671
 672   if (Config.DecompressDebugSections && !zlib::isAvailable())
 673     return createStringError(
 674         errc::invalid_argument,
 675         "LLVM was not compiled with LLVM_ENABLE_ZLIB: cannot decompress");
 676
 677   if (Config.ExtractPartition && Config.ExtractMainPartition)
 678     return createStringError(errc::invalid_argument,
 679                              "cannot specify --extract-partition together with "
 680                              "--extract-main-partition");
 681
 682   DC.CopyConfigs.push_back(std::move(Config));
 683   return std::move(DC);
 684 }
 685
 686 // ParseStripOptions returns the config and sets the input arguments. If a
 687 // help flag is set then ParseStripOptions will print the help messege and
 688 // exit.
 689 Expected<DriverConfig>
 690 parseStripOptions(ArrayRef<const char *> ArgsArr,
 691                   std::function<Error(Error)> ErrorCallback) {
 692   StripOptTable T;
 693   unsigned MissingArgumentIndex, MissingArgumentCount;
 694   llvm::opt::InputArgList InputArgs =
 695       T.ParseArgs(ArgsArr, MissingArgumentIndex, MissingArgumentCount);
 696
 697   if (InputArgs.size() == 0) {
 698     printHelp(T, errs(), "llvm-strip");
 699     exit(1);
 700   }
 701
 702   if (InputArgs.hasArg(STRIP_help)) {
 703     printHelp(T, outs(), "llvm-strip");
 704     exit(0);
 705   }
 706
 707   if (InputArgs.hasArg(STRIP_version)) {
 708     outs() << "llvm-strip, compatible with GNU strip\n";
 709     cl::PrintVersionMessage();
 710     exit(0);
 711   }
 712
 713   SmallVector<StringRef, 2> Positional;
 714   for (auto Arg : InputArgs.filtered(STRIP_UNKNOWN))
 715     return createStringError(errc::invalid_argument, "unknown argument '%s'",
 716                              Arg->getAsString(InputArgs).c_str());
 717   for (auto Arg : InputArgs.filtered(STRIP_INPUT))
 718     Positional.push_back(Arg->getValue());
 719
 720   if (Positional.empty())
 721     return createStringError(errc::invalid_argument, "no input file specified");
 722
 723   if (Positional.size() > 1 && InputArgs.hasArg(STRIP_output))
 724     return createStringError(
 725         errc::invalid_argument,
 726         "multiple input files cannot be used in combination with -o");
 727
 728   CopyConfig Config;
 729   bool UseRegexp = InputArgs.hasArg(STRIP_regex);
 730   Config.AllowBrokenLinks = InputArgs.hasArg(STRIP_allow_broken_links);
 731   Config.StripDebug = InputArgs.hasArg(STRIP_strip_debug);
 732
 733   if (InputArgs.hasArg(STRIP_discard_all, STRIP_discard_locals))
 734     Config.DiscardMode =
 735         InputArgs.hasFlag(STRIP_discard_all, STRIP_discard_locals)
 736             ? DiscardType::All
 737             : DiscardType::Locals;
 738   Config.StripSections = InputArgs.hasArg(STRIP_strip_sections);
 739   Config.StripUnneeded = InputArgs.hasArg(STRIP_strip_unneeded);
 740   if (auto Arg = InputArgs.getLastArg(STRIP_strip_all, STRIP_no_strip_all))
 741     Config.StripAll = Arg->getOption().getID() == STRIP_strip_all;
 742   Config.StripAllGNU = InputArgs.hasArg(STRIP_strip_all_gnu);
 743   Config.OnlyKeepDebug = InputArgs.hasArg(STRIP_only_keep_debug);
 744   Config.KeepFileSymbols = InputArgs.hasArg(STRIP_keep_file_symbols);
 745
 746   for (auto Arg : InputArgs.filtered(STRIP_keep_section))
 747     Config.KeepSection.addMatcher({Arg->getValue(), UseRegexp});
 748
 749   for (auto Arg : InputArgs.filtered(STRIP_remove_section))
 750     Config.ToRemove.addMatcher({Arg->getValue(), UseRegexp});
 751
 752   for (auto Arg : InputArgs.filtered(STRIP_strip_symbol))
 753     Config.SymbolsToRemove.addMatcher({Arg->getValue(), UseRegexp});
 754
 755   for (auto Arg : InputArgs.filtered(STRIP_keep_symbol))
 756     Config.SymbolsToKeep.addMatcher({Arg->getValue(), UseRegexp});
 757
 758   if (!InputArgs.hasArg(STRIP_no_strip_all) && !Config.StripDebug &&
 759       !Config.StripUnneeded && Config.DiscardMode == DiscardType::None &&
 760       !Config.StripAllGNU && Config.SymbolsToRemove.empty())
 761     Config.StripAll = true;
 762
 763   if (Config.DiscardMode == DiscardType::All)
 764     Config.StripDebug = true;
 765
 766   Config.DeterministicArchives =
 767       InputArgs.hasFlag(STRIP_enable_deterministic_archives,
 768                         STRIP_disable_deterministic_archives, /*default=*/true);
 769
 770   Config.PreserveDates = InputArgs.hasArg(STRIP_preserve_dates);
 771   Config.InputFormat = FileFormat::Unspecified;
 772   Config.OutputFormat = FileFormat::Unspecified;
 773
 774   DriverConfig DC;
 775   if (Positional.size() == 1) {
 776     Config.InputFilename = Positional[0];
 777     Config.OutputFilename =
 778         InputArgs.getLastArgValue(STRIP_output, Positional[0]);
 779     DC.CopyConfigs.push_back(std::move(Config));
 780   } else {
 781     StringMap<unsigned> InputFiles;
 782     for (StringRef Filename : Positional) {
 783       if (InputFiles[Filename]++ == 1) {
 784         if (Filename == "-")
 785           return createStringError(
 786               errc::invalid_argument,
 787               "cannot specify '-' as an input file more than once");
 788         if (Error E = ErrorCallback(createStringError(
 789                 errc::invalid_argument, "'%s' was already specified",
 790                 Filename.str().c_str())))
 791           return std::move(E);
 792       }
 793       Config.InputFilename = Filename;
 794       Config.OutputFilename = Filename;
 795       DC.CopyConfigs.push_back(Config);
 796     }
 797   }
 798
 799   if (Config.PreserveDates && (is_contained(Positional, "-") ||
 800                                InputArgs.getLastArgValue(STRIP_output) == "-"))
 801     return createStringError(errc::invalid_argument,
 802                              "--preserve-dates requires a file");
 803
 804   return std::move(DC);
 805 }
 806
 807 } // namespace objcopy
 808 } // namespace llvm