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   // --headers -e
  61   cl::opt<bool>
  62       Headers("headers",
  63           cl::desc("Equivalent to setting: --file-headers, --program-headers, "
  64                    "--section-headers"));
  65   cl::alias HeadersShort("e", cl::desc("Alias for --headers"),
  66      cl::aliasopt(Headers));
  67
  68   // -wide, -W
  69   cl::opt<bool>
  70       WideOutput("wide", cl::desc("Ignored for compatibility with GNU readelf"),
  71                  cl::Hidden);
  72   cl::alias WideOutputShort("W",
  73     cl::desc("Alias for --wide"),
  74     cl::aliasopt(WideOutput));
  75
  76   // -file-headers, -file-header, -h
  77   cl::opt<bool> FileHeaders("file-headers",
  78     cl::desc("Display file headers "));
  79   cl::alias FileHeadersShort("h", cl::desc("Alias for --file-headers"),
  80                              cl::aliasopt(FileHeaders), cl::NotHidden);
  81   cl::alias FileHeadersSingular("file-header",
  82                                 cl::desc("Alias for --file-headers"),
  83                                 cl::aliasopt(FileHeaders));
  84
  85   // -section-headers, -sections, -S
  86   // Also -s in llvm-readobj mode.
  87   cl::opt<bool> SectionHeaders("section-headers",
  88                                cl::desc("Display all section headers."));
  89   cl::alias SectionsShortUpper("S", cl::desc("Alias for --section-headers"),
  90                                cl::aliasopt(SectionHeaders), cl::NotHidden);
  91   cl::alias SectionHeadersAlias("sections",
  92                                 cl::desc("Alias for --section-headers"),
  93                                 cl::aliasopt(SectionHeaders), cl::NotHidden);
  94
  95   // -section-relocations, -sr
  96   cl::opt<bool> SectionRelocations("section-relocations",
  97     cl::desc("Display relocations for each section shown."));
  98   cl::alias SectionRelocationsShort("sr",
  99     cl::desc("Alias for --section-relocations"),
 100     cl::aliasopt(SectionRelocations));
 101
 102   // -section-symbols, -st
 103   cl::opt<bool> SectionSymbols("section-symbols",
 104     cl::desc("Display symbols for each section shown."));
 105   cl::alias SectionSymbolsShort("st",
 106     cl::desc("Alias for --section-symbols"),
 107     cl::aliasopt(SectionSymbols));
 108
 109   // -section-data, -sd
 110   cl::opt<bool> SectionData("section-data",
 111     cl::desc("Display section data for each section shown."));
 112   cl::alias SectionDataShort("sd",
 113     cl::desc("Alias for --section-data"),
 114     cl::aliasopt(SectionData));
 115
 116   // -relocations, -relocs, -r
 117   cl::opt<bool> Relocations("relocations",
 118     cl::desc("Display the relocation entries in the file"));
 119   cl::alias RelocationsShort("r", cl::desc("Alias for --relocations"),
 120                              cl::aliasopt(Relocations), cl::NotHidden);
 121   cl::alias RelocationsGNU("relocs", cl::desc("Alias for --relocations"),
 122                            cl::aliasopt(Relocations));
 123
 124   // -notes, -n
 125   cl::opt<bool> Notes("notes", cl::desc("Display the ELF notes in the file"));
 126   cl::alias NotesShort("n", cl::desc("Alias for --notes"), cl::aliasopt(Notes));
 127
 128   // -dyn-relocations
 129   cl::opt<bool> DynRelocs("dyn-relocations",
 130     cl::desc("Display the dynamic relocation entries in the file"));
 131
 132   // -symbols
 133   // Also -s in llvm-readelf mode, or -t in llvm-readobj mode.
 134   cl::opt<bool> Symbols("symbols",
 135     cl::desc("Display the symbol table"));
 136   cl::alias SymbolsGNU("syms", cl::desc("Alias for --symbols"),
 137                        cl::aliasopt(Symbols));
 138
 139   // -dyn-symbols, -dyn-syms, -dt
 140   cl::opt<bool> DynamicSymbols("dyn-symbols",
 141     cl::desc("Display the dynamic symbol table"));
 142   cl::alias DynamicSymbolsShort("dt",
 143     cl::desc("Alias for --dyn-symbols"),
 144     cl::aliasopt(DynamicSymbols));
 145   cl::alias DynSymsGNU("dyn-syms", cl::desc("Alias for --dyn-symbols"),
 146                        cl::aliasopt(DynamicSymbols));
 147
 148   // -unwind, -u
 149   cl::opt<bool> UnwindInfo("unwind",
 150     cl::desc("Display unwind information"));
 151   cl::alias UnwindInfoShort("u",
 152     cl::desc("Alias for --unwind"),
 153     cl::aliasopt(UnwindInfo));
 154
 155   // -dynamic-table, -dynamic, -d
 156   cl::opt<bool> DynamicTable("dynamic-table",
 157     cl::desc("Display the ELF .dynamic section table"));
 158   cl::alias DynamicTableShort("d", cl::desc("Alias for --dynamic-table"),
 159                               cl::aliasopt(DynamicTable), cl::NotHidden);
 160   cl::alias DynamicTableAlias("dynamic", cl::desc("Alias for --dynamic-table"),
 161                               cl::aliasopt(DynamicTable));
 162
 163   // -needed-libs
 164   cl::opt<bool> NeededLibraries("needed-libs",
 165     cl::desc("Display the needed libraries"));
 166
 167   // -program-headers, -segments, -l
 168   cl::opt<bool> ProgramHeaders("program-headers",
 169     cl::desc("Display ELF program headers"));
 170   cl::alias ProgramHeadersShort("l", cl::desc("Alias for --program-headers"),
 171                                 cl::aliasopt(ProgramHeaders), cl::NotHidden);
 172   cl::alias SegmentsAlias("segments", cl::desc("Alias for --program-headers"),
 173                           cl::aliasopt(ProgramHeaders));
 174
 175   // -string-dump, -p
 176   cl::list<std::string> StringDump("string-dump", cl::desc("<number|name>"),
 177                                    cl::ZeroOrMore);
 178   cl::alias StringDumpShort("p", cl::desc("Alias for --string-dump"),
 179                             cl::aliasopt(StringDump));
 180
 181   // -hex-dump, -x
 182   cl::list<std::string> HexDump("hex-dump", cl::desc("<number|name>"),
 183                                 cl::ZeroOrMore);
 184   cl::alias HexDumpShort("x", cl::desc("Alias for --hex-dump"),
 185                          cl::aliasopt(HexDump));
 186
 187   // -hash-table
 188   cl::opt<bool> HashTable("hash-table",
 189     cl::desc("Display ELF hash table"));
 190
 191   // -gnu-hash-table
 192   cl::opt<bool> GnuHashTable("gnu-hash-table",
 193     cl::desc("Display ELF .gnu.hash section"));
 194
 195   // -expand-relocs
 196   cl::opt<bool> ExpandRelocs("expand-relocs",
 197     cl::desc("Expand each shown relocation to multiple lines"));
 198
 199   // -raw-relr
 200   cl::opt<bool> RawRelr("raw-relr",
 201     cl::desc("Do not decode relocations in SHT_RELR section, display raw contents"));
 202
 203   // -codeview
 204   cl::opt<bool> CodeView("codeview",
 205                          cl::desc("Display CodeView debug information"));
 206
 207   // -codeview-merged-types
 208   cl::opt<bool>
 209       CodeViewMergedTypes("codeview-merged-types",
 210                           cl::desc("Display the merged CodeView type stream"));
 211
 212   // -codeview-subsection-bytes
 213   cl::opt<bool> CodeViewSubsectionBytes(
 214       "codeview-subsection-bytes",
 215       cl::desc("Dump raw contents of codeview debug sections and records"));
 216
 217   // -arm-attributes
 218   cl::opt<bool> ARMAttributes("arm-attributes",
 219                               cl::desc("Display the ARM attributes section"));
 220
 221   // -mips-plt-got
 222   cl::opt<bool>
 223   MipsPLTGOT("mips-plt-got",
 224              cl::desc("Display the MIPS GOT and PLT GOT sections"));
 225
 226   // -mips-abi-flags
 227   cl::opt<bool> MipsABIFlags("mips-abi-flags",
 228                              cl::desc("Display the MIPS.abiflags section"));
 229
 230   // -mips-reginfo
 231   cl::opt<bool> MipsReginfo("mips-reginfo",
 232                             cl::desc("Display the MIPS .reginfo section"));
 233
 234   // -mips-options
 235   cl::opt<bool> MipsOptions("mips-options",
 236                             cl::desc("Display the MIPS .MIPS.options section"));
 237
 238   // -coff-imports
 239   cl::opt<bool>
 240   COFFImports("coff-imports", cl::desc("Display the PE/COFF import table"));
 241
 242   // -coff-exports
 243   cl::opt<bool>
 244   COFFExports("coff-exports", cl::desc("Display the PE/COFF export table"));
 245
 246   // -coff-directives
 247   cl::opt<bool>
 248   COFFDirectives("coff-directives",
 249                  cl::desc("Display the PE/COFF .drectve section"));
 250
 251   // -coff-basereloc
 252   cl::opt<bool>
 253   COFFBaseRelocs("coff-basereloc",
 254                  cl::desc("Display the PE/COFF .reloc section"));
 255
 256   // -coff-debug-directory
 257   cl::opt<bool>
 258   COFFDebugDirectory("coff-debug-directory",
 259                      cl::desc("Display the PE/COFF debug directory"));
 260
 261   // -coff-resources
 262   cl::opt<bool> COFFResources("coff-resources",
 263                               cl::desc("Display the PE/COFF .rsrc section"));
 264
 265   // -coff-load-config
 266   cl::opt<bool>
 267   COFFLoadConfig("coff-load-config",
 268                  cl::desc("Display the PE/COFF load config"));
 269
 270   // -elf-linker-options
 271   cl::opt<bool>
 272   ELFLinkerOptions("elf-linker-options",
 273                    cl::desc("Display the ELF .linker-options section"));
 274
 275   // -macho-data-in-code
 276   cl::opt<bool>
 277   MachODataInCode("macho-data-in-code",
 278                   cl::desc("Display MachO Data in Code command"));
 279
 280   // -macho-indirect-symbols
 281   cl::opt<bool>
 282   MachOIndirectSymbols("macho-indirect-symbols",
 283                   cl::desc("Display MachO indirect symbols"));
 284
 285   // -macho-linker-options
 286   cl::opt<bool>
 287   MachOLinkerOptions("macho-linker-options",
 288                   cl::desc("Display MachO linker options"));
 289
 290   // -macho-segment
 291   cl::opt<bool>
 292   MachOSegment("macho-segment",
 293                   cl::desc("Display MachO Segment command"));
 294
 295   // -macho-version-min
 296   cl::opt<bool>
 297   MachOVersionMin("macho-version-min",
 298                   cl::desc("Display MachO version min command"));
 299
 300   // -macho-dysymtab
 301   cl::opt<bool>
 302   MachODysymtab("macho-dysymtab",
 303                   cl::desc("Display MachO Dysymtab command"));
 304
 305   // -stackmap
 306   cl::opt<bool>
 307   PrintStackMap("stackmap",
 308                 cl::desc("Display contents of stackmap section"));
 309
 310   // -version-info, -V
 311   cl::opt<bool>
 312       VersionInfo("version-info",
 313                   cl::desc("Display ELF version sections (if present)"));
 314   cl::alias VersionInfoShort("V", cl::desc("Alias for -version-info"),
 315                              cl::aliasopt(VersionInfo));
 316
 317   // -elf-section-groups, -section-groups, -g
 318   cl::opt<bool> SectionGroups("elf-section-groups",
 319                               cl::desc("Display ELF section group contents"));
 320   cl::alias SectionGroupsAlias("section-groups",
 321                                cl::desc("Alias for -elf-sections-groups"),
 322                                cl::aliasopt(SectionGroups));
 323   cl::alias SectionGroupsShort("g", cl::desc("Alias for -elf-sections-groups"),
 324                                cl::aliasopt(SectionGroups));
 325
 326   // -elf-hash-histogram, -histogram, -I
 327   cl::opt<bool> HashHistogram(
 328       "elf-hash-histogram",
 329       cl::desc("Display bucket list histogram for hash sections"));
 330   cl::alias HashHistogramShort("I", cl::desc("Alias for -elf-hash-histogram"),
 331                                cl::aliasopt(HashHistogram));
 332   cl::alias HistogramAlias("histogram",
 333                            cl::desc("Alias for --elf-hash-histogram"),
 334                            cl::aliasopt(HashHistogram));
 335
 336   // -elf-cg-profile
 337   cl::opt<bool> CGProfile("elf-cg-profile", cl::desc("Display callgraph profile section"));
 338
 339   // -addrsig
 340   cl::opt<bool> Addrsig("addrsig",
 341                         cl::desc("Display address-significance table"));
 342
 343   // -elf-output-style
 344   cl::opt<OutputStyleTy>
 345       Output("elf-output-style", cl::desc("Specify ELF dump style"),
 346              cl::values(clEnumVal(LLVM, "LLVM default style"),
 347                         clEnumVal(GNU, "GNU readelf style")),
 348              cl::init(LLVM));
 349 } // namespace opts
 350
 351 namespace llvm {
 352
 353 LLVM_ATTRIBUTE_NORETURN void reportError(Twine Msg) {
 354   errs() << "\nError reading file: " << Msg << ".\n";
 355   errs().flush();
 356   exit(1);
 357 }
 358
 359 void error(Error EC) {
 360   if (!EC)
 361     return;
 362   handleAllErrors(std::move(EC),
 363                   [&](const ErrorInfoBase &EI) { reportError(EI.message()); });
 364 }
 365
 366 void error(std::error_code EC) {
 367   if (!EC)
 368     return;
 369   reportError(EC.message());
 370 }
 371
 372 bool relocAddressLess(RelocationRef a, RelocationRef b) {
 373   return a.getOffset() < b.getOffset();
 374 }
 375
 376 } // namespace llvm
 377
 378 static void reportError(StringRef Input, std::error_code EC) {
 379   if (Input == "-")
 380     Input = "<stdin>";
 381
 382   reportError(Twine(Input) + ": " + EC.message());
 383 }
 384
 385 static void reportError(StringRef Input, Error Err) {
 386   if (Input == "-")
 387     Input = "<stdin>";
 388   std::string ErrMsg;
 389   {
 390     raw_string_ostream ErrStream(ErrMsg);
 391     logAllUnhandledErrors(std::move(Err), ErrStream, Input + ": ");
 392   }
 393   reportError(ErrMsg);
 394 }
 395
 396 static bool isMipsArch(unsigned Arch) {
 397   switch (Arch) {
 398   case llvm::Triple::mips:
 399   case llvm::Triple::mipsel:
 400   case llvm::Triple::mips64:
 401   case llvm::Triple::mips64el:
 402     return true;
 403   default:
 404     return false;
 405   }
 406 }
 407 namespace {
 408 struct ReadObjTypeTableBuilder {
 409   ReadObjTypeTableBuilder()
 410       : Allocator(), IDTable(Allocator), TypeTable(Allocator) {}
 411
 412   llvm::BumpPtrAllocator Allocator;
 413   llvm::codeview::MergingTypeTableBuilder IDTable;
 414   llvm::codeview::MergingTypeTableBuilder TypeTable;
 415 };
 416 }
 417 static ReadObjTypeTableBuilder CVTypes;
 418
 419 /// Creates an format-specific object file dumper.
 420 static std::error_code createDumper(const ObjectFile *Obj,
 421                                     ScopedPrinter &Writer,
 422                                     std::unique_ptr<ObjDumper> &Result) {
 423   if (!Obj)
 424     return readobj_error::unsupported_file_format;
 425
 426   if (Obj->isCOFF())
 427     return createCOFFDumper(Obj, Writer, Result);
 428   if (Obj->isELF())
 429     return createELFDumper(Obj, Writer, Result);
 430   if (Obj->isMachO())
 431     return createMachODumper(Obj, Writer, Result);
 432   if (Obj->isWasm())
 433     return createWasmDumper(Obj, Writer, Result);
 434
 435   return readobj_error::unsupported_obj_file_format;
 436 }
 437
 438 /// Dumps the specified object file.
 439 static void dumpObject(const ObjectFile *Obj, ScopedPrinter &Writer) {
 440   std::unique_ptr<ObjDumper> Dumper;
 441   if (std::error_code EC = createDumper(Obj, Writer, Dumper))
 442     reportError(Obj->getFileName(), EC);
 443
 444   if (opts::Output == opts::LLVM) {
 445     Writer.startLine() << "\n";
 446     Writer.printString("File", Obj->getFileName());
 447     Writer.printString("Format", Obj->getFileFormatName());
 448     Writer.printString("Arch", Triple::getArchTypeName(
 449                                    (llvm::Triple::ArchType)Obj->getArch()));
 450     Writer.printString("AddressSize",
 451                        formatv("{0}bit", 8 * Obj->getBytesInAddress()));
 452     Dumper->printLoadName();
 453   }
 454
 455   if (opts::FileHeaders)
 456     Dumper->printFileHeaders();
 457   if (opts::SectionHeaders)
 458     Dumper->printSectionHeaders();
 459   if (opts::Relocations)
 460     Dumper->printRelocations();
 461   if (opts::DynRelocs)
 462     Dumper->printDynamicRelocations();
 463   if (opts::Symbols)
 464     Dumper->printSymbols();
 465   if (opts::DynamicSymbols)
 466     Dumper->printDynamicSymbols();
 467   if (opts::UnwindInfo)
 468     Dumper->printUnwindInfo();
 469   if (opts::DynamicTable)
 470     Dumper->printDynamicTable();
 471   if (opts::NeededLibraries)
 472     Dumper->printNeededLibraries();
 473   if (opts::ProgramHeaders)
 474     Dumper->printProgramHeaders();
 475   if (!opts::StringDump.empty())
 476     llvm::for_each(opts::StringDump, [&Dumper, Obj](StringRef SectionName) {
 477       Dumper->printSectionAsString(Obj, SectionName);
 478     });
 479   if (!opts::HexDump.empty())
 480     llvm::for_each(opts::HexDump, [&Dumper, Obj](StringRef SectionName) {
 481       Dumper->printSectionAsHex(Obj, SectionName);
 482     });
 483   if (opts::HashTable)
 484     Dumper->printHashTable();
 485   if (opts::GnuHashTable)
 486     Dumper->printGnuHashTable();
 487   if (opts::VersionInfo)
 488     Dumper->printVersionInfo();
 489   if (Obj->isELF()) {
 490     if (opts::ELFLinkerOptions)
 491       Dumper->printELFLinkerOptions();
 492     if (Obj->getArch() == llvm::Triple::arm)
 493       if (opts::ARMAttributes)
 494         Dumper->printAttributes();
 495     if (isMipsArch(Obj->getArch())) {
 496       if (opts::MipsPLTGOT)
 497         Dumper->printMipsPLTGOT();
 498       if (opts::MipsABIFlags)
 499         Dumper->printMipsABIFlags();
 500       if (opts::MipsReginfo)
 501         Dumper->printMipsReginfo();
 502       if (opts::MipsOptions)
 503         Dumper->printMipsOptions();
 504     }
 505     if (opts::SectionGroups)
 506       Dumper->printGroupSections();
 507     if (opts::HashHistogram)
 508       Dumper->printHashHistogram();
 509     if (opts::CGProfile)
 510       Dumper->printCGProfile();
 511     if (opts::Addrsig)
 512       Dumper->printAddrsig();
 513     if (opts::Notes)
 514       Dumper->printNotes();
 515   }
 516   if (Obj->isCOFF()) {
 517     if (opts::COFFImports)
 518       Dumper->printCOFFImports();
 519     if (opts::COFFExports)
 520       Dumper->printCOFFExports();
 521     if (opts::COFFDirectives)
 522       Dumper->printCOFFDirectives();
 523     if (opts::COFFBaseRelocs)
 524       Dumper->printCOFFBaseReloc();
 525     if (opts::COFFDebugDirectory)
 526       Dumper->printCOFFDebugDirectory();
 527     if (opts::COFFResources)
 528       Dumper->printCOFFResources();
 529     if (opts::COFFLoadConfig)
 530       Dumper->printCOFFLoadConfig();
 531     if (opts::Addrsig)
 532       Dumper->printAddrsig();
 533     if (opts::CodeView)
 534       Dumper->printCodeViewDebugInfo();
 535     if (opts::CodeViewMergedTypes)
 536       Dumper->mergeCodeViewTypes(CVTypes.IDTable, CVTypes.TypeTable);
 537   }
 538   if (Obj->isMachO()) {
 539     if (opts::MachODataInCode)
 540       Dumper->printMachODataInCode();
 541     if (opts::MachOIndirectSymbols)
 542       Dumper->printMachOIndirectSymbols();
 543     if (opts::MachOLinkerOptions)
 544       Dumper->printMachOLinkerOptions();
 545     if (opts::MachOSegment)
 546       Dumper->printMachOSegment();
 547     if (opts::MachOVersionMin)
 548       Dumper->printMachOVersionMin();
 549     if (opts::MachODysymtab)
 550       Dumper->printMachODysymtab();
 551   }
 552   if (opts::PrintStackMap)
 553     Dumper->printStackMap();
 554 }
 555
 556 /// Dumps each object file in \a Arc;
 557 static void dumpArchive(const Archive *Arc, ScopedPrinter &Writer) {
 558   Error Err = Error::success();
 559   for (auto &Child : Arc->children(Err)) {
 560     Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
 561     if (!ChildOrErr) {
 562       if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError())) {
 563         reportError(Arc->getFileName(), ChildOrErr.takeError());
 564       }
 565       continue;
 566     }
 567     if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
 568       dumpObject(Obj, Writer);
 569     else if (COFFImportFile *Imp = dyn_cast<COFFImportFile>(&*ChildOrErr.get()))
 570       dumpCOFFImportFile(Imp, Writer);
 571     else
 572       reportError(Arc->getFileName(), readobj_error::unrecognized_file_format);
 573   }
 574   if (Err)
 575     reportError(Arc->getFileName(), std::move(Err));
 576 }
 577
 578 /// Dumps each object file in \a MachO Universal Binary;
 579 static void dumpMachOUniversalBinary(const MachOUniversalBinary *UBinary,
 580                                      ScopedPrinter &Writer) {
 581   for (const MachOUniversalBinary::ObjectForArch &Obj : UBinary->objects()) {
 582     Expected<std::unique_ptr<MachOObjectFile>> ObjOrErr = Obj.getAsObjectFile();
 583     if (ObjOrErr)
 584       dumpObject(&*ObjOrErr.get(), Writer);
 585     else if (auto E = isNotObjectErrorInvalidFileType(ObjOrErr.takeError())) {
 586       reportError(UBinary->getFileName(), ObjOrErr.takeError());
 587     }
 588     else if (Expected<std::unique_ptr<Archive>> AOrErr = Obj.getAsArchive())
 589       dumpArchive(&*AOrErr.get(), Writer);
 590   }
 591 }
 592
 593 /// Dumps \a WinRes, Windows Resource (.res) file;
 594 static void dumpWindowsResourceFile(WindowsResource *WinRes) {
 595   ScopedPrinter Printer{outs()};
 596   WindowsRes::Dumper Dumper(WinRes, Printer);
 597   if (auto Err = Dumper.printData())
 598     reportError(WinRes->getFileName(), std::move(Err));
 599 }
 600
 601
 602 /// Opens \a File and dumps it.
 603 static void dumpInput(StringRef File) {
 604   ScopedPrinter Writer(outs());
 605
 606   // Attempt to open the binary.
 607   Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
 608   if (!BinaryOrErr)
 609     reportError(File, BinaryOrErr.takeError());
 610   Binary &Binary = *BinaryOrErr.get().getBinary();
 611
 612   if (Archive *Arc = dyn_cast<Archive>(&Binary))
 613     dumpArchive(Arc, Writer);
 614   else if (MachOUniversalBinary *UBinary =
 615                dyn_cast<MachOUniversalBinary>(&Binary))
 616     dumpMachOUniversalBinary(UBinary, Writer);
 617   else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
 618     dumpObject(Obj, Writer);
 619   else if (COFFImportFile *Import = dyn_cast<COFFImportFile>(&Binary))
 620     dumpCOFFImportFile(Import, Writer);
 621   else if (WindowsResource *WinRes = dyn_cast<WindowsResource>(&Binary))
 622     dumpWindowsResourceFile(WinRes);
 623   else
 624     reportError(File, readobj_error::unrecognized_file_format);
 625 }
 626
 627 /// Registers aliases that should only be allowed by readobj.
 628 static void registerReadobjAliases() {
 629   // -s has meant --sections for a very long time in llvm-readobj despite
 630   // meaning --symbols in readelf.
 631   static cl::alias SectionsShort("s", cl::desc("Alias for --section-headers"),
 632                                  cl::aliasopt(opts::SectionHeaders),
 633                                  cl::NotHidden);
 634
 635   // Only register -t in llvm-readobj, as readelf reserves it for
 636   // --section-details (not implemented yet).
 637   static cl::alias SymbolsShort("t", cl::desc("Alias for --symbols"),
 638                                 cl::aliasopt(opts::Symbols), cl::NotHidden);
 639 }
 640
 641 /// Registers aliases that should only be allowed by readelf.
 642 static void registerReadelfAliases() {
 643   // -s is here because for readobj it means --sections.
 644   static cl::alias SymbolsShort("s", cl::desc("Alias for --symbols"),
 645                                 cl::aliasopt(opts::Symbols), cl::NotHidden);
 646 }
 647
 648 int main(int argc, const char *argv[]) {
 649   InitLLVM X(argc, argv);
 650
 651   // Register the target printer for --version.
 652   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
 653
 654   if (sys::path::stem(argv[0]).contains("readelf")) {
 655     opts::Output = opts::GNU;
 656     registerReadelfAliases();
 657   } else {
 658     registerReadobjAliases();
 659   }
 660
 661   cl::ParseCommandLineOptions(argc, argv, "LLVM Object Reader\n");
 662
 663   if (opts::All) {
 664     opts::FileHeaders = true;
 665     opts::ProgramHeaders = true;
 666     opts::SectionHeaders = true;
 667     opts::Symbols = true;
 668     opts::Relocations = true;
 669     opts::DynamicTable = true;
 670     opts::Notes = true;
 671     opts::VersionInfo = true;
 672     opts::UnwindInfo = true;
 673     opts::SectionGroups = true;
 674     opts::HashHistogram = true;
 675   }
 676
 677   if (opts::Headers) {
 678     opts::FileHeaders = true;
 679     opts::ProgramHeaders = true;
 680     opts::SectionHeaders = true;
 681   }
 682
 683   // Default to stdin if no filename is specified.
 684   if (opts::InputFilenames.empty())
 685     opts::InputFilenames.push_back("-");
 686
 687   llvm::for_each(opts::InputFilenames, dumpInput);
 688
 689   if (opts::CodeViewMergedTypes) {
 690     ScopedPrinter W(outs());
 691     dumpCodeViewMergedTypes(W, CVTypes.IDTable, CVTypes.TypeTable);
 692   }
 693
 694   return 0;
 695 }