tools/obj2yaml/elf2yaml.cpp

   1 //===------ utils/elf2yaml.cpp - obj2yaml conversion tool -------*- C++ -*-===//
   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 #include "Error.h"
  11 #include "llvm/ADT/DenseSet.h"
  12 #include "llvm/ADT/STLExtras.h"
  13 #include "llvm/Object/ELFObjectFile.h"
  14 #include "llvm/ObjectYAML/ELFYAML.h"
  15 #include "llvm/Support/ErrorHandling.h"
  16 #include "llvm/Support/YAMLTraits.h"
  17
  18 using namespace llvm;
  19
  20 namespace {
  21
  22 template <class ELFT>
  23 class ELFDumper {
  24   typedef object::Elf_Sym_Impl<ELFT> Elf_Sym;
  25   typedef typename ELFT::Shdr Elf_Shdr;
  26   typedef typename ELFT::Word Elf_Word;
  27   typedef typename ELFT::Rel Elf_Rel;
  28   typedef typename ELFT::Rela Elf_Rela;
  29
  30   ArrayRef<Elf_Shdr> Sections;
  31
  32   // If the file has multiple sections with the same name, we add a
  33   // suffix to make them unique.
  34   unsigned Suffix = 0;
  35   DenseSet<StringRef> UsedSectionNames;
  36   std::vector<std::string> SectionNames;
  37   Expected<StringRef> getUniquedSectionName(const Elf_Shdr *Sec);
  38   Expected<StringRef> getSymbolName(const Elf_Sym *Sym, StringRef StrTable,
  39                                     const Elf_Shdr *SymTab);
  40
  41   const object::ELFFile<ELFT> &Obj;
  42   ArrayRef<Elf_Word> ShndxTable;
  43
  44   std::error_code dumpSymbols(const Elf_Shdr *Symtab,
  45                               ELFYAML::LocalGlobalWeakSymbols &Symbols);
  46   std::error_code dumpSymbol(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
  47                              StringRef StrTable, ELFYAML::Symbol &S);
  48   std::error_code dumpCommonSection(const Elf_Shdr *Shdr, ELFYAML::Section &S);
  49   std::error_code dumpCommonRelocationSection(const Elf_Shdr *Shdr,
  50                                               ELFYAML::RelocationSection &S);
  51   template <class RelT>
  52   std::error_code dumpRelocation(const RelT *Rel, const Elf_Shdr *SymTab,
  53                                  ELFYAML::Relocation &R);
  54
  55   ErrorOr<ELFYAML::RelocationSection *> dumpRelSection(const Elf_Shdr *Shdr);
  56   ErrorOr<ELFYAML::RelocationSection *> dumpRelaSection(const Elf_Shdr *Shdr);
  57   ErrorOr<ELFYAML::RawContentSection *>
  58   dumpContentSection(const Elf_Shdr *Shdr);
  59   ErrorOr<ELFYAML::NoBitsSection *> dumpNoBitsSection(const Elf_Shdr *Shdr);
  60   ErrorOr<ELFYAML::Group *> dumpGroup(const Elf_Shdr *Shdr);
  61   ErrorOr<ELFYAML::MipsABIFlags *> dumpMipsABIFlags(const Elf_Shdr *Shdr);
  62
  63 public:
  64   ELFDumper(const object::ELFFile<ELFT> &O);
  65   ErrorOr<ELFYAML::Object *> dump();
  66 };
  67
  68 }
  69
  70 template <class ELFT>
  71 ELFDumper<ELFT>::ELFDumper(const object::ELFFile<ELFT> &O)
  72     : Obj(O) {}
  73
  74 template <class ELFT>
  75 Expected<StringRef>
  76 ELFDumper<ELFT>::getUniquedSectionName(const Elf_Shdr *Sec) {
  77   unsigned SecIndex = Sec - &Sections[0];
  78   assert(&Sections[SecIndex] == Sec);
  79   if (!SectionNames[SecIndex].empty())
  80     return SectionNames[SecIndex];
  81
  82   auto NameOrErr = Obj.getSectionName(Sec);
  83   if (!NameOrErr)
  84     return NameOrErr;
  85   StringRef Name = *NameOrErr;
  86   std::string &Ret = SectionNames[SecIndex];
  87   Ret = Name;
  88   while (!UsedSectionNames.insert(Ret).second)
  89     Ret = (Name + to_string(++Suffix)).str();
  90   return Ret;
  91 }
  92
  93 template <class ELFT>
  94 Expected<StringRef> ELFDumper<ELFT>::getSymbolName(const Elf_Sym *Sym,
  95                                                    StringRef StrTable,
  96                                                    const Elf_Shdr *SymTab) {
  97   Expected<StringRef> SymbolNameOrErr = Sym->getName(StrTable);
  98   if (!SymbolNameOrErr)
  99     return SymbolNameOrErr;
 100   StringRef Name = *SymbolNameOrErr;
 101   if (Name.empty() && Sym->getType() == ELF::STT_SECTION) {
 102     auto ShdrOrErr = Obj.getSection(Sym, SymTab, ShndxTable);
 103     if (!ShdrOrErr)
 104       return ShdrOrErr.takeError();
 105     return getUniquedSectionName(*ShdrOrErr);
 106   }
 107   return Name;
 108 }
 109
 110 template <class ELFT> ErrorOr<ELFYAML::Object *> ELFDumper<ELFT>::dump() {
 111   auto Y = make_unique<ELFYAML::Object>();
 112
 113   // Dump header
 114   Y->Header.Class = ELFYAML::ELF_ELFCLASS(Obj.getHeader()->getFileClass());
 115   Y->Header.Data = ELFYAML::ELF_ELFDATA(Obj.getHeader()->getDataEncoding());
 116   Y->Header.OSABI = Obj.getHeader()->e_ident[ELF::EI_OSABI];
 117   Y->Header.Type = Obj.getHeader()->e_type;
 118   Y->Header.Machine = Obj.getHeader()->e_machine;
 119   Y->Header.Flags = Obj.getHeader()->e_flags;
 120   Y->Header.Entry = Obj.getHeader()->e_entry;
 121
 122   const Elf_Shdr *Symtab = nullptr;
 123   const Elf_Shdr *DynSymtab = nullptr;
 124
 125   // Dump sections
 126   auto SectionsOrErr = Obj.sections();
 127   if (!SectionsOrErr)
 128     return errorToErrorCode(SectionsOrErr.takeError());
 129   Sections = *SectionsOrErr;
 130   SectionNames.resize(Sections.size());
 131   for (const Elf_Shdr &Sec : Sections) {
 132     switch (Sec.sh_type) {
 133     case ELF::SHT_NULL:
 134     case ELF::SHT_STRTAB:
 135       // Do not dump these sections.
 136       break;
 137     case ELF::SHT_SYMTAB:
 138       Symtab = &Sec;
 139       break;
 140     case ELF::SHT_DYNSYM:
 141       DynSymtab = &Sec;
 142       break;
 143     case ELF::SHT_SYMTAB_SHNDX: {
 144       auto TableOrErr = Obj.getSHNDXTable(Sec);
 145       if (!TableOrErr)
 146         return errorToErrorCode(TableOrErr.takeError());
 147       ShndxTable = *TableOrErr;
 148       break;
 149     }
 150     case ELF::SHT_RELA: {
 151       ErrorOr<ELFYAML::RelocationSection *> S = dumpRelaSection(&Sec);
 152       if (std::error_code EC = S.getError())
 153         return EC;
 154       Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
 155       break;
 156     }
 157     case ELF::SHT_REL: {
 158       ErrorOr<ELFYAML::RelocationSection *> S = dumpRelSection(&Sec);
 159       if (std::error_code EC = S.getError())
 160         return EC;
 161       Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
 162       break;
 163     }
 164     case ELF::SHT_GROUP: {
 165       ErrorOr<ELFYAML::Group *> G = dumpGroup(&Sec);
 166       if (std::error_code EC = G.getError())
 167         return EC;
 168       Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(G.get()));
 169       break;
 170     }
 171     case ELF::SHT_MIPS_ABIFLAGS: {
 172       ErrorOr<ELFYAML::MipsABIFlags *> G = dumpMipsABIFlags(&Sec);
 173       if (std::error_code EC = G.getError())
 174         return EC;
 175       Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(G.get()));
 176       break;
 177     }
 178     case ELF::SHT_NOBITS: {
 179       ErrorOr<ELFYAML::NoBitsSection *> S = dumpNoBitsSection(&Sec);
 180       if (std::error_code EC = S.getError())
 181         return EC;
 182       Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
 183       break;
 184     }
 185     default: {
 186       ErrorOr<ELFYAML::RawContentSection *> S = dumpContentSection(&Sec);
 187       if (std::error_code EC = S.getError())
 188         return EC;
 189       Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
 190     }
 191     }
 192   }
 193
 194   if (auto EC = dumpSymbols(Symtab, Y->Symbols))
 195     return EC;
 196   if (auto EC = dumpSymbols(DynSymtab, Y->DynamicSymbols))
 197     return EC;
 198
 199   return Y.release();
 200 }
 201
 202 template <class ELFT>
 203 std::error_code
 204 ELFDumper<ELFT>::dumpSymbols(const Elf_Shdr *Symtab,
 205                              ELFYAML::LocalGlobalWeakSymbols &Symbols) {
 206   if (!Symtab)
 207     return std::error_code();
 208
 209   auto StrTableOrErr = Obj.getStringTableForSymtab(*Symtab);
 210   if (!StrTableOrErr)
 211     return errorToErrorCode(StrTableOrErr.takeError());
 212   StringRef StrTable = *StrTableOrErr;
 213
 214   auto SymtabOrErr = Obj.symbols(Symtab);
 215   if (!SymtabOrErr)
 216     return errorToErrorCode(SymtabOrErr.takeError());
 217
 218   bool IsFirstSym = true;
 219   for (const auto &Sym : *SymtabOrErr) {
 220     if (IsFirstSym) {
 221       IsFirstSym = false;
 222       continue;
 223     }
 224
 225     ELFYAML::Symbol S;
 226     if (auto EC = dumpSymbol(&Sym, Symtab, StrTable, S))
 227       return EC;
 228
 229     switch (Sym.getBinding()) {
 230     case ELF::STB_LOCAL:
 231       Symbols.Local.push_back(S);
 232       break;
 233     case ELF::STB_GLOBAL:
 234       Symbols.Global.push_back(S);
 235       break;
 236     case ELF::STB_WEAK:
 237       Symbols.Weak.push_back(S);
 238       break;
 239     default:
 240       llvm_unreachable("Unknown ELF symbol binding");
 241     }
 242   }
 243
 244   return std::error_code();
 245 }
 246
 247 template <class ELFT>
 248 std::error_code
 249 ELFDumper<ELFT>::dumpSymbol(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
 250                             StringRef StrTable, ELFYAML::Symbol &S) {
 251   S.Type = Sym->getType();
 252   S.Value = Sym->st_value;
 253   S.Size = Sym->st_size;
 254   S.Other = Sym->st_other;
 255
 256   Expected<StringRef> SymbolNameOrErr = getSymbolName(Sym, StrTable, SymTab);
 257   if (!SymbolNameOrErr)
 258     return errorToErrorCode(SymbolNameOrErr.takeError());
 259   S.Name = SymbolNameOrErr.get();
 260
 261   auto ShdrOrErr = Obj.getSection(Sym, SymTab, ShndxTable);
 262   if (!ShdrOrErr)
 263     return errorToErrorCode(ShdrOrErr.takeError());
 264   const Elf_Shdr *Shdr = *ShdrOrErr;
 265   if (!Shdr)
 266     return obj2yaml_error::success;
 267
 268   auto NameOrErr = getUniquedSectionName(Shdr);
 269   if (!NameOrErr)
 270     return errorToErrorCode(NameOrErr.takeError());
 271   S.Section = NameOrErr.get();
 272
 273   return obj2yaml_error::success;
 274 }
 275
 276 template <class ELFT>
 277 template <class RelT>
 278 std::error_code ELFDumper<ELFT>::dumpRelocation(const RelT *Rel,
 279                                                 const Elf_Shdr *SymTab,
 280                                                 ELFYAML::Relocation &R) {
 281   R.Type = Rel->getType(Obj.isMips64EL());
 282   R.Offset = Rel->r_offset;
 283   R.Addend = 0;
 284
 285   auto SymOrErr = Obj.getRelocationSymbol(Rel, SymTab);
 286   if (!SymOrErr)
 287     return errorToErrorCode(SymOrErr.takeError());
 288   const Elf_Sym *Sym = *SymOrErr;
 289   auto StrTabSec = Obj.getSection(SymTab->sh_link);
 290   if (!StrTabSec)
 291     return errorToErrorCode(StrTabSec.takeError());
 292   auto StrTabOrErr = Obj.getStringTable(*StrTabSec);
 293   if (!StrTabOrErr)
 294     return errorToErrorCode(StrTabOrErr.takeError());
 295   StringRef StrTab = *StrTabOrErr;
 296
 297   if (Sym) {
 298     Expected<StringRef> NameOrErr = getSymbolName(Sym, StrTab, SymTab);
 299     if (!NameOrErr)
 300       return errorToErrorCode(NameOrErr.takeError());
 301     R.Symbol = NameOrErr.get();
 302   } else {
 303     // We have some edge cases of relocations without a symbol associated,
 304     // e.g. an object containing the invalid (according to the System V
 305     // ABI) R_X86_64_NONE reloc. Create a symbol with an empty name instead
 306     // of crashing.
 307     R.Symbol = "";
 308   }
 309
 310   return obj2yaml_error::success;
 311 }
 312
 313 template <class ELFT>
 314 std::error_code ELFDumper<ELFT>::dumpCommonSection(const Elf_Shdr *Shdr,
 315                                                    ELFYAML::Section &S) {
 316   S.Type = Shdr->sh_type;
 317   S.Flags = Shdr->sh_flags;
 318   S.Address = Shdr->sh_addr;
 319   S.AddressAlign = Shdr->sh_addralign;
 320
 321   auto NameOrErr = getUniquedSectionName(Shdr);
 322   if (!NameOrErr)
 323     return errorToErrorCode(NameOrErr.takeError());
 324   S.Name = NameOrErr.get();
 325
 326   if (Shdr->sh_link != ELF::SHN_UNDEF) {
 327     auto LinkSection = Obj.getSection(Shdr->sh_link);
 328     if (LinkSection.takeError())
 329       return errorToErrorCode(LinkSection.takeError());
 330     NameOrErr = getUniquedSectionName(*LinkSection);
 331     if (!NameOrErr)
 332       return errorToErrorCode(NameOrErr.takeError());
 333     S.Link = NameOrErr.get();
 334   }
 335
 336   return obj2yaml_error::success;
 337 }
 338
 339 template <class ELFT>
 340 std::error_code
 341 ELFDumper<ELFT>::dumpCommonRelocationSection(const Elf_Shdr *Shdr,
 342                                              ELFYAML::RelocationSection &S) {
 343   if (std::error_code EC = dumpCommonSection(Shdr, S))
 344     return EC;
 345
 346   auto InfoSection = Obj.getSection(Shdr->sh_info);
 347   if (!InfoSection)
 348     return errorToErrorCode(InfoSection.takeError());
 349
 350   auto NameOrErr = getUniquedSectionName(*InfoSection);
 351   if (!NameOrErr)
 352     return errorToErrorCode(NameOrErr.takeError());
 353   S.Info = NameOrErr.get();
 354
 355   return obj2yaml_error::success;
 356 }
 357
 358 template <class ELFT>
 359 ErrorOr<ELFYAML::RelocationSection *>
 360 ELFDumper<ELFT>::dumpRelSection(const Elf_Shdr *Shdr) {
 361   assert(Shdr->sh_type == ELF::SHT_REL && "Section type is not SHT_REL");
 362   auto S = make_unique<ELFYAML::RelocationSection>();
 363
 364   if (std::error_code EC = dumpCommonRelocationSection(Shdr, *S))
 365     return EC;
 366
 367   auto SymTabOrErr = Obj.getSection(Shdr->sh_link);
 368   if (!SymTabOrErr)
 369     return errorToErrorCode(SymTabOrErr.takeError());
 370   const Elf_Shdr *SymTab = *SymTabOrErr;
 371
 372   auto Rels = Obj.rels(Shdr);
 373   if (!Rels)
 374     return errorToErrorCode(Rels.takeError());
 375   for (const Elf_Rel &Rel : *Rels) {
 376     ELFYAML::Relocation R;
 377     if (std::error_code EC = dumpRelocation(&Rel, SymTab, R))
 378       return EC;
 379     S->Relocations.push_back(R);
 380   }
 381
 382   return S.release();
 383 }
 384
 385 template <class ELFT>
 386 ErrorOr<ELFYAML::RelocationSection *>
 387 ELFDumper<ELFT>::dumpRelaSection(const Elf_Shdr *Shdr) {
 388   assert(Shdr->sh_type == ELF::SHT_RELA && "Section type is not SHT_RELA");
 389   auto S = make_unique<ELFYAML::RelocationSection>();
 390
 391   if (std::error_code EC = dumpCommonRelocationSection(Shdr, *S))
 392     return EC;
 393
 394   auto SymTabOrErr = Obj.getSection(Shdr->sh_link);
 395   if (!SymTabOrErr)
 396     return errorToErrorCode(SymTabOrErr.takeError());
 397   const Elf_Shdr *SymTab = *SymTabOrErr;
 398
 399   auto Rels = Obj.relas(Shdr);
 400   if (!Rels)
 401     return errorToErrorCode(Rels.takeError());
 402   for (const Elf_Rela &Rel : *Rels) {
 403     ELFYAML::Relocation R;
 404     if (std::error_code EC = dumpRelocation(&Rel, SymTab, R))
 405       return EC;
 406     R.Addend = Rel.r_addend;
 407     S->Relocations.push_back(R);
 408   }
 409
 410   return S.release();
 411 }
 412
 413 template <class ELFT>
 414 ErrorOr<ELFYAML::RawContentSection *>
 415 ELFDumper<ELFT>::dumpContentSection(const Elf_Shdr *Shdr) {
 416   auto S = make_unique<ELFYAML::RawContentSection>();
 417
 418   if (std::error_code EC = dumpCommonSection(Shdr, *S))
 419     return EC;
 420
 421   auto ContentOrErr = Obj.getSectionContents(Shdr);
 422   if (!ContentOrErr)
 423     return errorToErrorCode(ContentOrErr.takeError());
 424   S->Content = yaml::BinaryRef(ContentOrErr.get());
 425   S->Size = S->Content.binary_size();
 426
 427   return S.release();
 428 }
 429
 430 template <class ELFT>
 431 ErrorOr<ELFYAML::NoBitsSection *>
 432 ELFDumper<ELFT>::dumpNoBitsSection(const Elf_Shdr *Shdr) {
 433   auto S = make_unique<ELFYAML::NoBitsSection>();
 434
 435   if (std::error_code EC = dumpCommonSection(Shdr, *S))
 436     return EC;
 437   S->Size = Shdr->sh_size;
 438
 439   return S.release();
 440 }
 441
 442 template <class ELFT>
 443 ErrorOr<ELFYAML::Group *> ELFDumper<ELFT>::dumpGroup(const Elf_Shdr *Shdr) {
 444   auto S = make_unique<ELFYAML::Group>();
 445
 446   if (std::error_code EC = dumpCommonSection(Shdr, *S))
 447     return EC;
 448   // Get sh_info which is the signature.
 449   auto SymtabOrErr = Obj.getSection(Shdr->sh_link);
 450   if (!SymtabOrErr)
 451     return errorToErrorCode(SymtabOrErr.takeError());
 452   const Elf_Shdr *Symtab = *SymtabOrErr;
 453   auto SymOrErr = Obj.getSymbol(Symtab, Shdr->sh_info);
 454   if (!SymOrErr)
 455     return errorToErrorCode(SymOrErr.takeError());
 456   const Elf_Sym *symbol = *SymOrErr;
 457   auto StrTabOrErr = Obj.getStringTableForSymtab(*Symtab);
 458   if (!StrTabOrErr)
 459     return errorToErrorCode(StrTabOrErr.takeError());
 460   StringRef StrTab = *StrTabOrErr;
 461   auto sectionContents = Obj.getSectionContents(Shdr);
 462   if (!sectionContents)
 463     return errorToErrorCode(sectionContents.takeError());
 464   Expected<StringRef> symbolName = getSymbolName(symbol, StrTab, Symtab);
 465   if (!symbolName)
 466     return errorToErrorCode(symbolName.takeError());
 467   S->Info = *symbolName;
 468   const Elf_Word *groupMembers =
 469       reinterpret_cast<const Elf_Word *>(sectionContents->data());
 470   const long count = (Shdr->sh_size) / sizeof(Elf_Word);
 471   ELFYAML::SectionOrType s;
 472   for (int i = 0; i < count; i++) {
 473     if (groupMembers[i] == llvm::ELF::GRP_COMDAT) {
 474       s.sectionNameOrType = "GRP_COMDAT";
 475     } else {
 476       auto sHdr = Obj.getSection(groupMembers[i]);
 477       if (!sHdr)
 478         return errorToErrorCode(sHdr.takeError());
 479       auto sectionName = getUniquedSectionName(*sHdr);
 480       if (!sectionName)
 481         return errorToErrorCode(sectionName.takeError());
 482       s.sectionNameOrType = *sectionName;
 483     }
 484     S->Members.push_back(s);
 485   }
 486   return S.release();
 487 }
 488
 489 template <class ELFT>
 490 ErrorOr<ELFYAML::MipsABIFlags *>
 491 ELFDumper<ELFT>::dumpMipsABIFlags(const Elf_Shdr *Shdr) {
 492   assert(Shdr->sh_type == ELF::SHT_MIPS_ABIFLAGS &&
 493          "Section type is not SHT_MIPS_ABIFLAGS");
 494   auto S = make_unique<ELFYAML::MipsABIFlags>();
 495   if (std::error_code EC = dumpCommonSection(Shdr, *S))
 496     return EC;
 497
 498   auto ContentOrErr = Obj.getSectionContents(Shdr);
 499   if (!ContentOrErr)
 500     return errorToErrorCode(ContentOrErr.takeError());
 501
 502   auto *Flags = reinterpret_cast<const object::Elf_Mips_ABIFlags<ELFT> *>(
 503       ContentOrErr.get().data());
 504   S->Version = Flags->version;
 505   S->ISALevel = Flags->isa_level;
 506   S->ISARevision = Flags->isa_rev;
 507   S->GPRSize = Flags->gpr_size;
 508   S->CPR1Size = Flags->cpr1_size;
 509   S->CPR2Size = Flags->cpr2_size;
 510   S->FpABI = Flags->fp_abi;
 511   S->ISAExtension = Flags->isa_ext;
 512   S->ASEs = Flags->ases;
 513   S->Flags1 = Flags->flags1;
 514   S->Flags2 = Flags->flags2;
 515   return S.release();
 516 }
 517
 518 template <class ELFT>
 519 static std::error_code elf2yaml(raw_ostream &Out,
 520                                 const object::ELFFile<ELFT> &Obj) {
 521   ELFDumper<ELFT> Dumper(Obj);
 522   ErrorOr<ELFYAML::Object *> YAMLOrErr = Dumper.dump();
 523   if (std::error_code EC = YAMLOrErr.getError())
 524     return EC;
 525
 526   std::unique_ptr<ELFYAML::Object> YAML(YAMLOrErr.get());
 527   yaml::Output Yout(Out);
 528   Yout << *YAML;
 529
 530   return std::error_code();
 531 }
 532
 533 std::error_code elf2yaml(raw_ostream &Out, const object::ObjectFile &Obj) {
 534   if (const auto *ELFObj = dyn_cast<object::ELF32LEObjectFile>(&Obj))
 535     return elf2yaml(Out, *ELFObj->getELFFile());
 536
 537   if (const auto *ELFObj = dyn_cast<object::ELF32BEObjectFile>(&Obj))
 538     return elf2yaml(Out, *ELFObj->getELFFile());
 539
 540   if (const auto *ELFObj = dyn_cast<object::ELF64LEObjectFile>(&Obj))
 541     return elf2yaml(Out, *ELFObj->getELFFile());
 542
 543   if (const auto *ELFObj = dyn_cast<object::ELF64BEObjectFile>(&Obj))
 544     return elf2yaml(Out, *ELFObj->getELFFile());
 545
 546   return obj2yaml_error::unsupported_obj_file_format;
 547 }