tools/llvm-readobj/llvm-readobj.cpp

   1 //===- llvm-readobj.cpp - Dump contents of an Object File -----------------===//
   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 // This is a tool similar to readelf, except it works on multiple object file
  11 // formats. The main purpose of this tool is to provide detailed output suitable
  12 // for FileCheck.
  13 //
  14 // Flags should be similar to readelf where supported, but the output format
  15 // does not need to be identical. The point is to not make users learn yet
  16 // another set of flags.
  17 //
  18 // Output should be specialized for each format where appropriate.
  19 //
  20 //===----------------------------------------------------------------------===//
  21
  22 #include "llvm-readobj.h"
  23 #include "Error.h"
  24 #include "ObjDumper.h"
  25 #include "WindowsResourceDumper.h"
  26 #include "llvm/DebugInfo/CodeView/MergingTypeTableBuilder.h"
  27 #include "llvm/Object/Archive.h"
  28 #include "llvm/Object/COFFImportFile.h"
  29 #include "llvm/Object/MachOUniversal.h"
  30 #include "llvm/Object/ObjectFile.h"
  31 #include "llvm/Object/WindowsResource.h"
  32 #include "llvm/Support/Casting.h"
  33 #include "llvm/Support/CommandLine.h"
  34 #include "llvm/Support/DataTypes.h"
  35 #include "llvm/Support/Debug.h"
  36 #include "llvm/Support/FileSystem.h"
  37 #include "llvm/Support/FormatVariadic.h"
  38 #include "llvm/Support/InitLLVM.h"
  39 #include "llvm/Support/Path.h"
  40 #include "llvm/Support/ScopedPrinter.h"
  41 #include "llvm/Support/TargetRegistry.h"
  42
  43 using namespace llvm;
  44 using namespace llvm::object;
  45
  46 namespace opts {
  47   cl::list<std::string> InputFilenames(cl::Positional,
  48     cl::desc("<input object files>"),
  49     cl::ZeroOrMore);
  50
  51   // -all, -a
  52   cl::opt<bool>
  53       All("all",
  54           cl::desc("Equivalent to setting: --file-headers, --program-headers, "
  55                    "--section-headers, --symbols, --relocations, "
  56                    "--dynamic-table, --notes, --version-info, --unwind, "
  57                    "--section-groups and --elf-hash-histogram."));
  58   cl::alias AllShort("a", cl::desc("Alias for --all"), cl::aliasopt(All));
  59
  60   // -wide, -W
  61   cl::opt<bool>
  62       WideOutput("wide", cl::desc("Ignored for compatibility with GNU readelf"),
  63                  cl::Hidden);
  64   cl::alias WideOutputShort("W",
  65     cl::desc("Alias for --wide"),
  66     cl::aliasopt(WideOutput));
  67
  68   // -file-headers, -file-header, -h
  69   cl::opt<bool> FileHeaders("file-headers",
  70     cl::desc("Display file headers "));
  71   cl::alias FileHeadersShort("h", cl::desc("Alias for --file-headers"),
  72                              cl::aliasopt(FileHeaders), cl::NotHidden);
  73   cl::alias FileHeadersSingular("file-header",
  74                                 cl::desc("Alias for --file-headers"),
  75                                 cl::aliasopt(FileHeaders));
  76
  77   // -section-headers, -sections, -S
  78   // Also -s in llvm-readobj mode.
  79   cl::opt<bool> SectionHeaders("section-headers",
  80                                cl::desc("Display all section headers."));
  81   cl::alias SectionsShortUpper("S", cl::desc("Alias for --section-headers"),
  82                                cl::aliasopt(SectionHeaders), cl::NotHidden);
  83   cl::alias SectionHeadersAlias("sections",
  84                                 cl::desc("Alias for --section-headers"),
  85                                 cl::aliasopt(SectionHeaders), cl::NotHidden);
  86
  87   // -section-relocations, -sr
  88   cl::opt<bool> SectionRelocations("section-relocations",
  89     cl::desc("Display relocations for each section shown."));
  90   cl::alias SectionRelocationsShort("sr",
  91     cl::desc("Alias for --section-relocations"),
  92     cl::aliasopt(SectionRelocations));
  93
  94   // -section-symbols, -st
  95   cl::opt<bool> SectionSymbols("section-symbols",
  96     cl::desc("Display symbols for each section shown."));
  97   cl::alias SectionSymbolsShort("st",
  98     cl::desc("Alias for --section-symbols"),
  99     cl::aliasopt(SectionSymbols));
 100
 101   // -section-data, -sd
 102   cl::opt<bool> SectionData("section-data",
 103     cl::desc("Display section data for each section shown."));
 104   cl::alias SectionDataShort("sd",
 105     cl::desc("Alias for --section-data"),
 106     cl::aliasopt(SectionData));
 107
 108   // -relocations, -relocs, -r
 109   cl::opt<bool> Relocations("relocations",
 110     cl::desc("Display the relocation entries in the file"));
 111   cl::alias RelocationsShort("r", cl::desc("Alias for --relocations"),
 112                              cl::aliasopt(Relocations), cl::NotHidden);
 113   cl::alias RelocationsGNU("relocs", cl::desc("Alias for --relocations"),
 114                            cl::aliasopt(Relocations));
 115
 116   // -notes, -n
 117   cl::opt<bool> Notes("notes", cl::desc("Display the ELF notes in the file"));
 118   cl::alias NotesShort("n", cl::desc("Alias for --notes"), cl::aliasopt(Notes));
 119
 120   // -dyn-relocations
 121   cl::opt<bool> DynRelocs("dyn-relocations",
 122     cl::desc("Display the dynamic relocation entries in the file"));
 123
 124   // -symbols
 125   // Also -s in llvm-readelf mode, or -t in llvm-readobj mode.
 126   cl::opt<bool> Symbols("symbols",
 127     cl::desc("Display the symbol table"));
 128   cl::alias SymbolsGNU("syms", cl::desc("Alias for --symbols"),
 129                        cl::aliasopt(Symbols));
 130
 131   // -dyn-symbols, -dyn-syms, -dt
 132   cl::opt<bool> DynamicSymbols("dyn-symbols",
 133     cl::desc("Display the dynamic symbol table"));
 134   cl::alias DynamicSymbolsShort("dt",
 135     cl::desc("Alias for --dyn-symbols"),
 136     cl::aliasopt(DynamicSymbols));
 137   cl::alias DynSymsGNU("dyn-syms", cl::desc("Alias for --dyn-symbols"),
 138                        cl::aliasopt(DynamicSymbols));
 139
 140   // -unwind, -u
 141   cl::opt<bool> UnwindInfo("unwind",
 142     cl::desc("Display unwind information"));
 143   cl::alias UnwindInfoShort("u",
 144     cl::desc("Alias for --unwind"),
 145     cl::aliasopt(UnwindInfo));
 146
 147   // -dynamic-table, -dynamic, -d
 148   cl::opt<bool> DynamicTable("dynamic-table",
 149     cl::desc("Display the ELF .dynamic section table"));
 150   cl::alias DynamicTableShort("d", cl::desc("Alias for --dynamic-table"),
 151                               cl::aliasopt(DynamicTable), cl::NotHidden);
 152   cl::alias DynamicTableAlias("dynamic", cl::desc("Alias for --dynamic-table"),
 153                               cl::aliasopt(DynamicTable));
 154
 155   // -needed-libs
 156   cl::opt<bool> NeededLibraries("needed-libs",
 157     cl::desc("Display the needed libraries"));
 158
 159   // -program-headers, -segments, -l
 160   cl::opt<bool> ProgramHeaders("program-headers",
 161     cl::desc("Display ELF program headers"));
 162   cl::alias ProgramHeadersShort("l", cl::desc("Alias for --program-headers"),
 163                                 cl::aliasopt(ProgramHeaders), cl::NotHidden);
 164   cl::alias SegmentsAlias("segments", cl::desc("Alias for --program-headers"),
 165                           cl::aliasopt(ProgramHeaders));
 166
 167   // -string-dump, -p
 168   cl::list<std::string> StringDump("string-dump", cl::desc("<number|name>"),
 169                                    cl::ZeroOrMore);
 170   cl::alias StringDumpShort("p", cl::desc("Alias for --string-dump"),
 171                             cl::aliasopt(StringDump));
 172
 173   // -hex-dump, -x
 174   cl::list<std::string> HexDump("hex-dump", cl::desc("<number|name>"),
 175                                 cl::ZeroOrMore);
 176   cl::alias HexDumpShort("x", cl::desc("Alias for --hex-dump"),
 177                          cl::aliasopt(HexDump));
 178
 179   // -hash-table
 180   cl::opt<bool> HashTable("hash-table",
 181     cl::desc("Display ELF hash table"));
 182
 183   // -gnu-hash-table
 184   cl::opt<bool> GnuHashTable("gnu-hash-table",
 185     cl::desc("Display ELF .gnu.hash section"));
 186
 187   // -expand-relocs
 188   cl::opt<bool> ExpandRelocs("expand-relocs",
 189     cl::desc("Expand each shown relocation to multiple lines"));
 190
 191   // -raw-relr
 192   cl::opt<bool> RawRelr("raw-relr",
 193     cl::desc("Do not decode relocations in SHT_RELR section, display raw contents"));
 194
 195   // -codeview
 196   cl::opt<bool> CodeView("codeview",
 197                          cl::desc("Display CodeView debug information"));
 198
 199   // -codeview-merged-types
 200   cl::opt<bool>
 201       CodeViewMergedTypes("codeview-merged-types",
 202                           cl::desc("Display the merged CodeView type stream"));
 203
 204   // -codeview-subsection-bytes
 205   cl::opt<bool> CodeViewSubsectionBytes(
 206       "codeview-subsection-bytes",
 207       cl::desc("Dump raw contents of codeview debug sections and records"));
 208
 209   // -arm-attributes
 210   cl::opt<bool> ARMAttributes("arm-attributes",
 211                               cl::desc("Display the ARM attributes section"));
 212
 213   // -mips-plt-got
 214   cl::opt<bool>
 215   MipsPLTGOT("mips-plt-got",
 216              cl::desc("Display the MIPS GOT and PLT GOT sections"));
 217
 218   // -mips-abi-flags
 219   cl::opt<bool> MipsABIFlags("mips-abi-flags",
 220                              cl::desc("Display the MIPS.abiflags section"));
 221
 222   // -mips-reginfo
 223   cl::opt<bool> MipsReginfo("mips-reginfo",
 224                             cl::desc("Display the MIPS .reginfo section"));
 225
 226   // -mips-options
 227   cl::opt<bool> MipsOptions("mips-options",
 228                             cl::desc("Display the MIPS .MIPS.options section"));
 229
 230   // -coff-imports
 231   cl::opt<bool>
 232   COFFImports("coff-imports", cl::desc("Display the PE/COFF import table"));
 233
 234   // -coff-exports
 235   cl::opt<bool>
 236   COFFExports("coff-exports", cl::desc("Display the PE/COFF export table"));
 237
 238   // -coff-directives
 239   cl::opt<bool>
 240   COFFDirectives("coff-directives",
 241                  cl::desc("Display the PE/COFF .drectve section"));
 242
 243   // -coff-basereloc
 244   cl::opt<bool>
 245   COFFBaseRelocs("coff-basereloc",
 246                  cl::desc("Display the PE/COFF .reloc section"));
 247
 248   // -coff-debug-directory
 249   cl::opt<bool>
 250   COFFDebugDirectory("coff-debug-directory",
 251                      cl::desc("Display the PE/COFF debug directory"));
 252
 253   // -coff-resources
 254   cl::opt<bool> COFFResources("coff-resources",
 255                               cl::desc("Display the PE/COFF .rsrc section"));
 256
 257   // -coff-load-config
 258   cl::opt<bool>
 259   COFFLoadConfig("coff-load-config",
 260                  cl::desc("Display the PE/COFF load config"));
 261
 262   // -elf-linker-options
 263   cl::opt<bool>
 264   ELFLinkerOptions("elf-linker-options",
 265                    cl::desc("Display the ELF .linker-options section"));
 266
 267   // -macho-data-in-code
 268   cl::opt<bool>
 269   MachODataInCode("macho-data-in-code",
 270                   cl::desc("Display MachO Data in Code command"));
 271
 272   // -macho-indirect-symbols
 273   cl::opt<bool>
 274   MachOIndirectSymbols("macho-indirect-symbols",
 275                   cl::desc("Display MachO indirect symbols"));
 276
 277   // -macho-linker-options
 278   cl::opt<bool>
 279   MachOLinkerOptions("macho-linker-options",
 280                   cl::desc("Display MachO linker options"));
 281
 282   // -macho-segment
 283   cl::opt<bool>
 284   MachOSegment("macho-segment",
 285                   cl::desc("Display MachO Segment command"));
 286
 287   // -macho-version-min
 288   cl::opt<bool>
 289   MachOVersionMin("macho-version-min",
 290                   cl::desc("Display MachO version min command"));
 291
 292   // -macho-dysymtab
 293   cl::opt<bool>
 294   MachODysymtab("macho-dysymtab",
 295                   cl::desc("Display MachO Dysymtab command"));
 296
 297   // -stackmap
 298   cl::opt<bool>
 299   PrintStackMap("stackmap",
 300                 cl::desc("Display contents of stackmap section"));
 301
 302   // -version-info, -V
 303   cl::opt<bool>
 304       VersionInfo("version-info",
 305                   cl::desc("Display ELF version sections (if present)"));
 306   cl::alias VersionInfoShort("V", cl::desc("Alias for -version-info"),
 307                              cl::aliasopt(VersionInfo));
 308
 309   // -elf-section-groups, -section-groups, -g
 310   cl::opt<bool> SectionGroups("elf-section-groups",
 311                               cl::desc("Display ELF section group contents"));
 312   cl::alias SectionGroupsAlias("section-groups",
 313                                cl::desc("Alias for -elf-sections-groups"),
 314                                cl::aliasopt(SectionGroups));
 315   cl::alias SectionGroupsShort("g", cl::desc("Alias for -elf-sections-groups"),
 316                                cl::aliasopt(SectionGroups));
 317
 318   // -elf-hash-histogram, -histogram, -I
 319   cl::opt<bool> HashHistogram(
 320       "elf-hash-histogram",
 321       cl::desc("Display bucket list histogram for hash sections"));
 322   cl::alias HashHistogramShort("I", cl::desc("Alias for -elf-hash-histogram"),
 323                                cl::aliasopt(HashHistogram));
 324   cl::alias HistogramAlias("histogram",
 325                            cl::desc("Alias for --elf-hash-histogram"),
 326                            cl::aliasopt(HashHistogram));
 327
 328   // -elf-cg-profile
 329   cl::opt<bool> CGProfile("elf-cg-profile", cl::desc("Display callgraph profile section"));
 330
 331   // -addrsig
 332   cl::opt<bool> Addrsig("addrsig",
 333                         cl::desc("Display address-significance table"));
 334
 335   // -elf-output-style
 336   cl::opt<OutputStyleTy>
 337       Output("elf-output-style", cl::desc("Specify ELF dump style"),
 338              cl::values(clEnumVal(LLVM, "LLVM default style"),
 339                         clEnumVal(GNU, "GNU readelf style")),
 340              cl::init(LLVM));
 341 } // namespace opts
 342
 343 namespace llvm {
 344
 345 LLVM_ATTRIBUTE_NORETURN void reportError(Twine Msg) {
 346   errs() << "\nError reading file: " << Msg << ".\n";
 347   errs().flush();
 348   exit(1);
 349 }
 350
 351 void error(Error EC) {
 352   if (!EC)
 353     return;
 354   handleAllErrors(std::move(EC),
 355                   [&](const ErrorInfoBase &EI) { reportError(EI.message()); });
 356 }
 357
 358 void error(std::error_code EC) {
 359   if (!EC)
 360     return;
 361   reportError(EC.message());
 362 }
 363
 364 bool relocAddressLess(RelocationRef a, RelocationRef b) {
 365   return a.getOffset() < b.getOffset();
 366 }
 367
 368 } // namespace llvm
 369
 370 static void reportError(StringRef Input, std::error_code EC) {
 371   if (Input == "-")
 372     Input = "<stdin>";
 373
 374   reportError(Twine(Input) + ": " + EC.message());
 375 }
 376
 377 static void reportError(StringRef Input, Error Err) {
 378   if (Input == "-")
 379     Input = "<stdin>";
 380   std::string ErrMsg;
 381   {
 382     raw_string_ostream ErrStream(ErrMsg);
 383     logAllUnhandledErrors(std::move(Err), ErrStream, Input + ": ");
 384   }
 385   reportError(ErrMsg);
 386 }
 387
 388 static bool isMipsArch(unsigned Arch) {
 389   switch (Arch) {
 390   case llvm::Triple::mips:
 391   case llvm::Triple::mipsel:
 392   case llvm::Triple::mips64:
 393   case llvm::Triple::mips64el:
 394     return true;
 395   default:
 396     return false;
 397   }
 398 }
 399 namespace {
 400 struct ReadObjTypeTableBuilder {
 401   ReadObjTypeTableBuilder()
 402       : Allocator(), IDTable(Allocator), TypeTable(Allocator) {}
 403
 404   llvm::BumpPtrAllocator Allocator;
 405   llvm::codeview::MergingTypeTableBuilder IDTable;
 406   llvm::codeview::MergingTypeTableBuilder TypeTable;
 407 };
 408 }
 409 static ReadObjTypeTableBuilder CVTypes;
 410
 411 /// Creates an format-specific object file dumper.
 412 static std::error_code createDumper(const ObjectFile *Obj,
 413                                     ScopedPrinter &Writer,
 414                                     std::unique_ptr<ObjDumper> &Result) {
 415   if (!Obj)
 416     return readobj_error::unsupported_file_format;
 417
 418   if (Obj->isCOFF())
 419     return createCOFFDumper(Obj, Writer, Result);
 420   if (Obj->isELF())
 421     return createELFDumper(Obj, Writer, Result);
 422   if (Obj->isMachO())
 423     return createMachODumper(Obj, Writer, Result);
 424   if (Obj->isWasm())
 425     return createWasmDumper(Obj, Writer, Result);
 426
 427   return readobj_error::unsupported_obj_file_format;
 428 }
 429
 430 /// Dumps the specified object file.
 431 static void dumpObject(const ObjectFile *Obj, ScopedPrinter &Writer) {
 432   std::unique_ptr<ObjDumper> Dumper;
 433   if (std::error_code EC = createDumper(Obj, Writer, Dumper))
 434     reportError(Obj->getFileName(), EC);
 435
 436   if (opts::Output == opts::LLVM) {
 437     Writer.startLine() << "\n";
 438     Writer.printString("File", Obj->getFileName());
 439     Writer.printString("Format", Obj->getFileFormatName());
 440     Writer.printString("Arch", Triple::getArchTypeName(
 441                                    (llvm::Triple::ArchType)Obj->getArch()));
 442     Writer.printString("AddressSize",
 443                        formatv("{0}bit", 8 * Obj->getBytesInAddress()));
 444     Dumper->printLoadName();
 445   }
 446
 447   if (opts::FileHeaders)
 448     Dumper->printFileHeaders();
 449   if (opts::SectionHeaders)
 450     Dumper->printSectionHeaders();
 451   if (opts::Relocations)
 452     Dumper->printRelocations();
 453   if (opts::DynRelocs)
 454     Dumper->printDynamicRelocations();
 455   if (opts::Symbols)
 456     Dumper->printSymbols();
 457   if (opts::DynamicSymbols)
 458     Dumper->printDynamicSymbols();
 459   if (opts::UnwindInfo)
 460     Dumper->printUnwindInfo();
 461   if (opts::DynamicTable)
 462     Dumper->printDynamicTable();
 463   if (opts::NeededLibraries)
 464     Dumper->printNeededLibraries();
 465   if (opts::ProgramHeaders)
 466     Dumper->printProgramHeaders();
 467   if (!opts::StringDump.empty())
 468     llvm::for_each(opts::StringDump, [&Dumper, Obj](StringRef SectionName) {
 469       Dumper->printSectionAsString(Obj, SectionName);
 470     });
 471   if (!opts::HexDump.empty())
 472     llvm::for_each(opts::HexDump, [&Dumper, Obj](StringRef SectionName) {
 473       Dumper->printSectionAsHex(Obj, SectionName);
 474     });
 475   if (opts::HashTable)
 476     Dumper->printHashTable();
 477   if (opts::GnuHashTable)
 478     Dumper->printGnuHashTable();
 479   if (opts::VersionInfo)
 480     Dumper->printVersionInfo();
 481   if (Obj->isELF()) {
 482     if (opts::ELFLinkerOptions)
 483       Dumper->printELFLinkerOptions();
 484     if (Obj->getArch() == llvm::Triple::arm)
 485       if (opts::ARMAttributes)
 486         Dumper->printAttributes();
 487     if (isMipsArch(Obj->getArch())) {
 488       if (opts::MipsPLTGOT)
 489         Dumper->printMipsPLTGOT();
 490       if (opts::MipsABIFlags)
 491         Dumper->printMipsABIFlags();
 492       if (opts::MipsReginfo)
 493         Dumper->printMipsReginfo();
 494       if (opts::MipsOptions)
 495         Dumper->printMipsOptions();
 496     }
 497     if (opts::SectionGroups)
 498       Dumper->printGroupSections();
 499     if (opts::HashHistogram)
 500       Dumper->printHashHistogram();
 501     if (opts::CGProfile)
 502       Dumper->printCGProfile();
 503     if (opts::Addrsig)
 504       Dumper->printAddrsig();
 505     if (opts::Notes)
 506       Dumper->printNotes();
 507   }
 508   if (Obj->isCOFF()) {
 509     if (opts::COFFImports)
 510       Dumper->printCOFFImports();
 511     if (opts::COFFExports)
 512       Dumper->printCOFFExports();
 513     if (opts::COFFDirectives)
 514       Dumper->printCOFFDirectives();
 515     if (opts::COFFBaseRelocs)
 516       Dumper->printCOFFBaseReloc();
 517     if (opts::COFFDebugDirectory)
 518       Dumper->printCOFFDebugDirectory();
 519     if (opts::COFFResources)
 520       Dumper->printCOFFResources();
 521     if (opts::COFFLoadConfig)
 522       Dumper->printCOFFLoadConfig();
 523     if (opts::Addrsig)
 524       Dumper->printAddrsig();
 525     if (opts::CodeView)
 526       Dumper->printCodeViewDebugInfo();
 527     if (opts::CodeViewMergedTypes)
 528       Dumper->mergeCodeViewTypes(CVTypes.IDTable, CVTypes.TypeTable);
 529   }
 530   if (Obj->isMachO()) {
 531     if (opts::MachODataInCode)
 532       Dumper->printMachODataInCode();
 533     if (opts::MachOIndirectSymbols)
 534       Dumper->printMachOIndirectSymbols();
 535     if (opts::MachOLinkerOptions)
 536       Dumper->printMachOLinkerOptions();
 537     if (opts::MachOSegment)
 538       Dumper->printMachOSegment();
 539     if (opts::MachOVersionMin)
 540       Dumper->printMachOVersionMin();
 541     if (opts::MachODysymtab)
 542       Dumper->printMachODysymtab();
 543   }
 544   if (opts::PrintStackMap)
 545     Dumper->printStackMap();
 546 }
 547
 548 /// Dumps each object file in \a Arc;
 549 static void dumpArchive(const Archive *Arc, ScopedPrinter &Writer) {
 550   Error Err = Error::success();
 551   for (auto &Child : Arc->children(Err)) {
 552     Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
 553     if (!ChildOrErr) {
 554       if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError())) {
 555         reportError(Arc->getFileName(), ChildOrErr.takeError());
 556       }
 557       continue;
 558     }
 559     if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
 560       dumpObject(Obj, Writer);
 561     else if (COFFImportFile *Imp = dyn_cast<COFFImportFile>(&*ChildOrErr.get()))
 562       dumpCOFFImportFile(Imp, Writer);
 563     else
 564       reportError(Arc->getFileName(), readobj_error::unrecognized_file_format);
 565   }
 566   if (Err)
 567     reportError(Arc->getFileName(), std::move(Err));
 568 }
 569
 570 /// Dumps each object file in \a MachO Universal Binary;
 571 static void dumpMachOUniversalBinary(const MachOUniversalBinary *UBinary,
 572                                      ScopedPrinter &Writer) {
 573   for (const MachOUniversalBinary::ObjectForArch &Obj : UBinary->objects()) {
 574     Expected<std::unique_ptr<MachOObjectFile>> ObjOrErr = Obj.getAsObjectFile();
 575     if (ObjOrErr)
 576       dumpObject(&*ObjOrErr.get(), Writer);
 577     else if (auto E = isNotObjectErrorInvalidFileType(ObjOrErr.takeError())) {
 578       reportError(UBinary->getFileName(), ObjOrErr.takeError());
 579     }
 580     else if (Expected<std::unique_ptr<Archive>> AOrErr = Obj.getAsArchive())
 581       dumpArchive(&*AOrErr.get(), Writer);
 582   }
 583 }
 584
 585 /// Dumps \a WinRes, Windows Resource (.res) file;
 586 static void dumpWindowsResourceFile(WindowsResource *WinRes) {
 587   ScopedPrinter Printer{outs()};
 588   WindowsRes::Dumper Dumper(WinRes, Printer);
 589   if (auto Err = Dumper.printData())
 590     reportError(WinRes->getFileName(), std::move(Err));
 591 }
 592
 593
 594 /// Opens \a File and dumps it.
 595 static void dumpInput(StringRef File) {
 596   ScopedPrinter Writer(outs());
 597
 598   // Attempt to open the binary.
 599   Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
 600   if (!BinaryOrErr)
 601     reportError(File, BinaryOrErr.takeError());
 602   Binary &Binary = *BinaryOrErr.get().getBinary();
 603
 604   if (Archive *Arc = dyn_cast<Archive>(&Binary))
 605     dumpArchive(Arc, Writer);
 606   else if (MachOUniversalBinary *UBinary =
 607                dyn_cast<MachOUniversalBinary>(&Binary))
 608     dumpMachOUniversalBinary(UBinary, Writer);
 609   else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
 610     dumpObject(Obj, Writer);
 611   else if (COFFImportFile *Import = dyn_cast<COFFImportFile>(&Binary))
 612     dumpCOFFImportFile(Import, Writer);
 613   else if (WindowsResource *WinRes = dyn_cast<WindowsResource>(&Binary))
 614     dumpWindowsResourceFile(WinRes);
 615   else
 616     reportError(File, readobj_error::unrecognized_file_format);
 617 }
 618
 619 /// Registers aliases that should only be allowed by readobj.
 620 static void registerReadobjAliases() {
 621   // -s has meant --sections for a very long time in llvm-readobj despite
 622   // meaning --symbols in readelf.
 623   static cl::alias SectionsShort("s", cl::desc("Alias for --section-headers"),
 624                                  cl::aliasopt(opts::SectionHeaders),
 625                                  cl::NotHidden);
 626
 627   // Only register -t in llvm-readobj, as readelf reserves it for
 628   // --section-details (not implemented yet).
 629   static cl::alias SymbolsShort("t", cl::desc("Alias for --symbols"),
 630                                 cl::aliasopt(opts::Symbols), cl::NotHidden);
 631 }
 632
 633 /// Registers aliases that should only be allowed by readelf.
 634 static void registerReadelfAliases() {
 635   // -s is here because for readobj it means --sections.
 636   static cl::alias SymbolsShort("s", cl::desc("Alias for --symbols"),
 637                                 cl::aliasopt(opts::Symbols), cl::NotHidden);
 638 }
 639
 640 int main(int argc, const char *argv[]) {
 641   InitLLVM X(argc, argv);
 642
 643   // Register the target printer for --version.
 644   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
 645
 646   if (sys::path::stem(argv[0]).contains("readelf")) {
 647     opts::Output = opts::GNU;
 648     registerReadelfAliases();
 649   } else {
 650     registerReadobjAliases();
 651   }
 652
 653   cl::ParseCommandLineOptions(argc, argv, "LLVM Object Reader\n");
 654
 655   if (opts::All) {
 656     opts::FileHeaders = true;
 657     opts::ProgramHeaders = true;
 658     opts::SectionHeaders = true;
 659     opts::Symbols = true;
 660     opts::Relocations = true;
 661     opts::DynamicTable = true;
 662     opts::Notes = true;
 663     opts::VersionInfo = true;
 664     opts::UnwindInfo = true;
 665     opts::SectionGroups = true;
 666     opts::HashHistogram = true;
 667   }
 668
 669   // Default to stdin if no filename is specified.
 670   if (opts::InputFilenames.size() == 0)
 671     opts::InputFilenames.push_back("-");
 672
 673   llvm::for_each(opts::InputFilenames, dumpInput);
 674
 675   if (opts::CodeViewMergedTypes) {
 676     ScopedPrinter W(outs());
 677     dumpCodeViewMergedTypes(W, CVTypes.IDTable, CVTypes.TypeTable);
 678   }
 679
 680   return 0;
 681 }