lib/Object/COFFObjectFile.cpp

   1 //===- COFFObjectFile.cpp - COFF object file implementation -----*- 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 // This file declares the COFFObjectFile class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Object/COFF.h"
  15 #include "llvm/ADT/SmallString.h"
  16 #include "llvm/ADT/StringSwitch.h"
  17 #include "llvm/ADT/Triple.h"
  18
  19 using namespace llvm;
  20 using namespace object;
  21
  22 namespace {
  23 using support::ulittle8_t;
  24 using support::ulittle16_t;
  25 using support::ulittle32_t;
  26 using support::little16_t;
  27 }
  28
  29 namespace {
  30 // Returns false if size is greater than the buffer size. And sets ec.
  31 bool checkSize(const MemoryBuffer *m, error_code &ec, uint64_t size) {
  32   if (m->getBufferSize() < size) {
  33     ec = object_error::unexpected_eof;
  34     return false;
  35   }
  36   return true;
  37 }
  38
  39 // Returns false if any bytes in [addr, addr + size) fall outsize of m.
  40 bool checkAddr(const MemoryBuffer *m,
  41                error_code &ec,
  42                uintptr_t addr,
  43                uint64_t size) {
  44   if (addr + size < addr ||
  45       addr + size < size ||
  46       addr + size > uintptr_t(m->getBufferEnd())) {
  47     ec = object_error::unexpected_eof;
  48     return false;
  49   }
  50   return true;
  51 }
  52 }
  53
  54 const coff_symbol *COFFObjectFile::toSymb(DataRefImpl Symb) const {
  55   const coff_symbol *addr = reinterpret_cast<const coff_symbol*>(Symb.p);
  56
  57 # ifndef NDEBUG
  58   // Verify that the symbol points to a valid entry in the symbol table.
  59   uintptr_t offset = uintptr_t(addr) - uintptr_t(base());
  60   if (offset < Header->PointerToSymbolTable
  61       || offset >= Header->PointerToSymbolTable
  62          + (Header->NumberOfSymbols * sizeof(coff_symbol)))
  63     report_fatal_error("Symbol was outside of symbol table.");
  64
  65   assert((offset - Header->PointerToSymbolTable) % sizeof(coff_symbol)
  66          == 0 && "Symbol did not point to the beginning of a symbol");
  67 # endif
  68
  69   return addr;
  70 }
  71
  72 const coff_section *COFFObjectFile::toSec(DataRefImpl Sec) const {
  73   const coff_section *addr = reinterpret_cast<const coff_section*>(Sec.p);
  74
  75 # ifndef NDEBUG
  76   // Verify that the section points to a valid entry in the section table.
  77   if (addr < SectionTable
  78       || addr >= (SectionTable + Header->NumberOfSections))
  79     report_fatal_error("Section was outside of section table.");
  80
  81   uintptr_t offset = uintptr_t(addr) - uintptr_t(SectionTable);
  82   assert(offset % sizeof(coff_section) == 0 &&
  83          "Section did not point to the beginning of a section");
  84 # endif
  85
  86   return addr;
  87 }
  88
  89 error_code COFFObjectFile::getSymbolNext(DataRefImpl Symb,
  90                                          SymbolRef &Result) const {
  91   const coff_symbol *symb = toSymb(Symb);
  92   symb += 1 + symb->NumberOfAuxSymbols;
  93   Symb.p = reinterpret_cast<uintptr_t>(symb);
  94   Result = SymbolRef(Symb, this);
  95   return object_error::success;
  96 }
  97
  98  error_code COFFObjectFile::getSymbolName(DataRefImpl Symb,
  99                                           StringRef &Result) const {
 100   const coff_symbol *symb = toSymb(Symb);
 101   // Check for string table entry. First 4 bytes are 0.
 102   if (symb->Name.Offset.Zeroes == 0) {
 103     uint32_t Offset = symb->Name.Offset.Offset;
 104     if (error_code ec = getString(Offset, Result))
 105       return ec;
 106     return object_error::success;
 107   }
 108
 109   if (symb->Name.ShortName[7] == 0)
 110     // Null terminated, let ::strlen figure out the length.
 111     Result = StringRef(symb->Name.ShortName);
 112   else
 113     // Not null terminated, use all 8 bytes.
 114     Result = StringRef(symb->Name.ShortName, 8);
 115   return object_error::success;
 116 }
 117
 118 error_code COFFObjectFile::getSymbolOffset(DataRefImpl Symb,
 119                                             uint64_t &Result) const {
 120   const coff_symbol *symb = toSymb(Symb);
 121   const coff_section *Section = NULL;
 122   if (error_code ec = getSection(symb->SectionNumber, Section))
 123     return ec;
 124   char Type;
 125   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 126     return ec;
 127   if (Type == 'U' || Type == 'w')
 128     Result = UnknownAddressOrSize;
 129   else if (Section)
 130     Result = Section->VirtualAddress + symb->Value;
 131   else
 132     Result = symb->Value;
 133   return object_error::success;
 134 }
 135
 136 error_code COFFObjectFile::getSymbolAddress(DataRefImpl Symb,
 137                                             uint64_t &Result) const {
 138   const coff_symbol *symb = toSymb(Symb);
 139   const coff_section *Section = NULL;
 140   if (error_code ec = getSection(symb->SectionNumber, Section))
 141     return ec;
 142   char Type;
 143   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 144     return ec;
 145   if (Type == 'U' || Type == 'w')
 146     Result = UnknownAddressOrSize;
 147   else if (Section)
 148     Result = reinterpret_cast<uintptr_t>(base() +
 149                                          Section->PointerToRawData +
 150                                          symb->Value);
 151   else
 152     Result = reinterpret_cast<uintptr_t>(base() + symb->Value);
 153   return object_error::success;
 154 }
 155
 156 error_code COFFObjectFile::getSymbolType(DataRefImpl Symb,
 157                                          SymbolRef::SymbolType &Result) const {
 158   const coff_symbol *symb = toSymb(Symb);
 159   Result = SymbolRef::ST_Other;
 160   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
 161       symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
 162     Result = SymbolRef::ST_External;
 163   } else {
 164     if (symb->Type.ComplexType == COFF::IMAGE_SYM_DTYPE_FUNCTION) {
 165       Result = SymbolRef::ST_Function;
 166     } else {
 167       char Type;
 168       if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 169         return ec;
 170       if (Type == 'r' || Type == 'R') {
 171         Result = SymbolRef::ST_Data;
 172       }
 173     }
 174   }
 175   return object_error::success;
 176 }
 177
 178 error_code COFFObjectFile::isSymbolGlobal(DataRefImpl Symb,
 179                                           bool &Result) const {
 180   const coff_symbol *symb = toSymb(Symb);
 181   Result = (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL);
 182   return object_error::success;
 183 }
 184
 185 error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb,
 186                                          uint64_t &Result) const {
 187   // FIXME: Return the correct size. This requires looking at all the symbols
 188   //        in the same section as this symbol, and looking for either the next
 189   //        symbol, or the end of the section.
 190   const coff_symbol *symb = toSymb(Symb);
 191   const coff_section *Section = NULL;
 192   if (error_code ec = getSection(symb->SectionNumber, Section))
 193     return ec;
 194   char Type;
 195   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 196     return ec;
 197   if (Type == 'U' || Type == 'w')
 198     Result = UnknownAddressOrSize;
 199   else if (Section)
 200     Result = Section->SizeOfRawData - symb->Value;
 201   else
 202     Result = 0;
 203   return object_error::success;
 204 }
 205
 206 error_code COFFObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
 207                                                char &Result) const {
 208   const coff_symbol *symb = toSymb(Symb);
 209   StringRef name;
 210   if (error_code ec = getSymbolName(Symb, name))
 211     return ec;
 212   char ret = StringSwitch<char>(name)
 213     .StartsWith(".debug", 'N')
 214     .StartsWith(".sxdata", 'N')
 215     .Default('?');
 216
 217   if (ret != '?') {
 218     Result = ret;
 219     return object_error::success;
 220   }
 221
 222   uint32_t Characteristics = 0;
 223   if (symb->SectionNumber > 0) {
 224     const coff_section *Section = NULL;
 225     if (error_code ec = getSection(symb->SectionNumber, Section))
 226       return ec;
 227     Characteristics = Section->Characteristics;
 228   }
 229
 230   switch (symb->SectionNumber) {
 231   case COFF::IMAGE_SYM_UNDEFINED:
 232     // Check storage classes.
 233     if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) {
 234       Result = 'w';
 235       return object_error::success; // Don't do ::toupper.
 236     } else
 237       ret = 'u';
 238     break;
 239   case COFF::IMAGE_SYM_ABSOLUTE:
 240     ret = 'a';
 241     break;
 242   case COFF::IMAGE_SYM_DEBUG:
 243     ret = 'n';
 244     break;
 245   default:
 246     // Check section type.
 247     if (Characteristics & COFF::IMAGE_SCN_CNT_CODE)
 248       ret = 't';
 249     else if (  Characteristics & COFF::IMAGE_SCN_MEM_READ
 250             && ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
 251       ret = 'r';
 252     else if (Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
 253       ret = 'd';
 254     else if (Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
 255       ret = 'b';
 256     else if (Characteristics & COFF::IMAGE_SCN_LNK_INFO)
 257       ret = 'i';
 258
 259     // Check for section symbol.
 260     else if (  symb->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC
 261             && symb->Value == 0)
 262        ret = 's';
 263   }
 264
 265   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
 266     ret = ::toupper(ret);
 267
 268   Result = ret;
 269   return object_error::success;
 270 }
 271
 272 error_code COFFObjectFile::isSymbolInternal(DataRefImpl Symb,
 273                                             bool &Result) const {
 274   Result = false;
 275   return object_error::success;
 276 }
 277
 278 error_code COFFObjectFile::getSectionNext(DataRefImpl Sec,
 279                                           SectionRef &Result) const {
 280   const coff_section *sec = toSec(Sec);
 281   sec += 1;
 282   Sec.p = reinterpret_cast<uintptr_t>(sec);
 283   Result = SectionRef(Sec, this);
 284   return object_error::success;
 285 }
 286
 287 error_code COFFObjectFile::getSectionName(DataRefImpl Sec,
 288                                           StringRef &Result) const {
 289   const coff_section *sec = toSec(Sec);
 290   StringRef name;
 291   if (sec->Name[7] == 0)
 292     // Null terminated, let ::strlen figure out the length.
 293     name = sec->Name;
 294   else
 295     // Not null terminated, use all 8 bytes.
 296     name = StringRef(sec->Name, 8);
 297
 298   // Check for string table entry. First byte is '/'.
 299   if (name[0] == '/') {
 300     uint32_t Offset;
 301     name.substr(1).getAsInteger(10, Offset);
 302     if (error_code ec = getString(Offset, name))
 303       return ec;
 304   }
 305
 306   Result = name;
 307   return object_error::success;
 308 }
 309
 310 error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec,
 311                                              uint64_t &Result) const {
 312   const coff_section *sec = toSec(Sec);
 313   Result = sec->VirtualAddress;
 314   return object_error::success;
 315 }
 316
 317 error_code COFFObjectFile::getSectionSize(DataRefImpl Sec,
 318                                           uint64_t &Result) const {
 319   const coff_section *sec = toSec(Sec);
 320   Result = sec->SizeOfRawData;
 321   return object_error::success;
 322 }
 323
 324 error_code COFFObjectFile::getSectionContents(DataRefImpl Sec,
 325                                               StringRef &Result) const {
 326   const coff_section *sec = toSec(Sec);
 327   // The only thing that we need to verify is that the contents is contained
 328   // within the file bounds. We don't need to make sure it doesn't cover other
 329   // data, as there's nothing that says that is not allowed.
 330   uintptr_t con_start = uintptr_t(base()) + sec->PointerToRawData;
 331   uintptr_t con_end = con_start + sec->SizeOfRawData;
 332   if (con_end >= uintptr_t(Data->getBufferEnd()))
 333     return object_error::parse_failed;
 334   Result = StringRef(reinterpret_cast<const char*>(con_start),
 335                      sec->SizeOfRawData);
 336   return object_error::success;
 337 }
 338
 339 error_code COFFObjectFile::isSectionText(DataRefImpl Sec,
 340                                          bool &Result) const {
 341   const coff_section *sec = toSec(Sec);
 342   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
 343   return object_error::success;
 344 }
 345
 346 error_code COFFObjectFile::isSectionData(DataRefImpl Sec,
 347                                          bool &Result) const {
 348   const coff_section *sec = toSec(Sec);
 349   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
 350   return object_error::success;
 351 }
 352
 353 error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec,
 354                                         bool &Result) const {
 355   const coff_section *sec = toSec(Sec);
 356   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
 357   return object_error::success;
 358 }
 359
 360 error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
 361                                                  DataRefImpl Symb,
 362                                                  bool &Result) const {
 363   // FIXME: Unimplemented.
 364   Result = false;
 365   return object_error::success;
 366 }
 367
 368 relocation_iterator COFFObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
 369   const coff_section *sec = toSec(Sec);
 370   DataRefImpl ret;
 371   std::memset(&ret, 0, sizeof(ret));
 372   if (sec->NumberOfRelocations == 0)
 373     ret.p = 0;
 374   else
 375     ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations);
 376
 377   return relocation_iterator(RelocationRef(ret, this));
 378 }
 379
 380 relocation_iterator COFFObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
 381   const coff_section *sec = toSec(Sec);
 382   DataRefImpl ret;
 383   std::memset(&ret, 0, sizeof(ret));
 384   if (sec->NumberOfRelocations == 0)
 385     ret.p = 0;
 386   else
 387     ret.p = reinterpret_cast<uintptr_t>(
 388               reinterpret_cast<const coff_relocation*>(
 389                 base() + sec->PointerToRelocations)
 390               + sec->NumberOfRelocations);
 391
 392   return relocation_iterator(RelocationRef(ret, this));
 393 }
 394
 395 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
 396   : ObjectFile(Binary::isCOFF, Object, ec) {
 397   // Check that we at least have enough room for a header.
 398   if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
 399
 400   // The actual starting location of the COFF header in the file. This can be
 401   // non-zero in PE/COFF files.
 402   uint64_t HeaderStart = 0;
 403
 404   // Check if this is a PE/COFF file.
 405   if (base()[0] == 0x4d && base()[1] == 0x5a) {
 406     // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
 407     // PE signature to find 'normal' COFF header.
 408     if (!checkSize(Data, ec, 0x3c + 8)) return;
 409     HeaderStart += *reinterpret_cast<const ulittle32_t *>(base() + 0x3c);
 410     // Check the PE header. ("PE\0\0")
 411     if (std::memcmp(base() + HeaderStart, "PE\0\0", 4) != 0) {
 412       ec = object_error::parse_failed;
 413       return;
 414     }
 415     HeaderStart += 4; // Skip the PE Header.
 416   }
 417
 418   Header = reinterpret_cast<const coff_file_header *>(base() + HeaderStart);
 419   if (!checkAddr(Data, ec, uintptr_t(Header), sizeof(coff_file_header)))
 420     return;
 421
 422   SectionTable =
 423     reinterpret_cast<const coff_section *>( base()
 424                                           + HeaderStart
 425                                           + sizeof(coff_file_header)
 426                                           + Header->SizeOfOptionalHeader);
 427   if (!checkAddr(Data, ec, uintptr_t(SectionTable),
 428                  Header->NumberOfSections * sizeof(coff_section)))
 429     return;
 430
 431   SymbolTable =
 432     reinterpret_cast<const coff_symbol *>(base()
 433                                           + Header->PointerToSymbolTable);
 434   if (!checkAddr(Data, ec, uintptr_t(SymbolTable),
 435                  Header->NumberOfSymbols * sizeof(coff_symbol)))
 436     return;
 437
 438   // Find string table.
 439   StringTable = reinterpret_cast<const char *>(base())
 440                 + Header->PointerToSymbolTable
 441                 + Header->NumberOfSymbols * sizeof(coff_symbol);
 442   if (!checkAddr(Data, ec, uintptr_t(StringTable), sizeof(ulittle32_t)))
 443     return;
 444
 445   StringTableSize = *reinterpret_cast<const ulittle32_t *>(StringTable);
 446   if (!checkAddr(Data, ec, uintptr_t(StringTable), StringTableSize))
 447     return;
 448   // Check that the string table is null terminated if has any in it.
 449   if (StringTableSize < 4
 450       || (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)) {
 451     ec = object_error::parse_failed;
 452     return;
 453   }
 454
 455   ec = object_error::success;
 456 }
 457
 458 symbol_iterator COFFObjectFile::begin_symbols() const {
 459   DataRefImpl ret;
 460   std::memset(&ret, 0, sizeof(DataRefImpl));
 461   ret.p = reinterpret_cast<intptr_t>(SymbolTable);
 462   return symbol_iterator(SymbolRef(ret, this));
 463 }
 464
 465 symbol_iterator COFFObjectFile::end_symbols() const {
 466   // The symbol table ends where the string table begins.
 467   DataRefImpl ret;
 468   std::memset(&ret, 0, sizeof(DataRefImpl));
 469   ret.p = reinterpret_cast<intptr_t>(StringTable);
 470   return symbol_iterator(SymbolRef(ret, this));
 471 }
 472
 473 section_iterator COFFObjectFile::begin_sections() const {
 474   DataRefImpl ret;
 475   std::memset(&ret, 0, sizeof(DataRefImpl));
 476   ret.p = reinterpret_cast<intptr_t>(SectionTable);
 477   return section_iterator(SectionRef(ret, this));
 478 }
 479
 480 section_iterator COFFObjectFile::end_sections() const {
 481   DataRefImpl ret;
 482   std::memset(&ret, 0, sizeof(DataRefImpl));
 483   ret.p = reinterpret_cast<intptr_t>(SectionTable + Header->NumberOfSections);
 484   return section_iterator(SectionRef(ret, this));
 485 }
 486
 487 uint8_t COFFObjectFile::getBytesInAddress() const {
 488   return getArch() == Triple::x86_64 ? 8 : 4;
 489 }
 490
 491 StringRef COFFObjectFile::getFileFormatName() const {
 492   switch(Header->Machine) {
 493   case COFF::IMAGE_FILE_MACHINE_I386:
 494     return "COFF-i386";
 495   case COFF::IMAGE_FILE_MACHINE_AMD64:
 496     return "COFF-x86-64";
 497   default:
 498     return "COFF-<unknown arch>";
 499   }
 500 }
 501
 502 unsigned COFFObjectFile::getArch() const {
 503   switch(Header->Machine) {
 504   case COFF::IMAGE_FILE_MACHINE_I386:
 505     return Triple::x86;
 506   case COFF::IMAGE_FILE_MACHINE_AMD64:
 507     return Triple::x86_64;
 508   default:
 509     return Triple::UnknownArch;
 510   }
 511 }
 512
 513 error_code COFFObjectFile::getSection(int32_t index,
 514                                       const coff_section *&Result) const {
 515   // Check for special index values.
 516   if (index == COFF::IMAGE_SYM_UNDEFINED ||
 517       index == COFF::IMAGE_SYM_ABSOLUTE ||
 518       index == COFF::IMAGE_SYM_DEBUG)
 519     Result = NULL;
 520   else if (index > 0 && index <= Header->NumberOfSections)
 521     // We already verified the section table data, so no need to check again.
 522     Result = SectionTable + (index - 1);
 523   else
 524     return object_error::parse_failed;
 525   return object_error::success;
 526 }
 527
 528 error_code COFFObjectFile::getString(uint32_t offset,
 529                                      StringRef &Result) const {
 530   if (StringTableSize <= 4)
 531     // Tried to get a string from an empty string table.
 532     return object_error::parse_failed;
 533   if (offset >= StringTableSize)
 534     return object_error::unexpected_eof;
 535   Result = StringRef(StringTable + offset);
 536   return object_error::success;
 537 }
 538
 539 error_code COFFObjectFile::getSymbol(uint32_t index,
 540                                      const coff_symbol *&Result) const {
 541   if (index > 0 && index < Header->NumberOfSymbols)
 542     Result = SymbolTable + index;
 543   else
 544     return object_error::parse_failed;
 545   return object_error::success;
 546 }
 547
 548 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
 549   return reinterpret_cast<const coff_relocation*>(Rel.p);
 550 }
 551 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
 552                                              RelocationRef &Res) const {
 553   ++*reinterpret_cast<const coff_relocation**>(&Rel.p);
 554   Res = RelocationRef(Rel, this);
 555   return object_error::success;
 556 }
 557 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
 558                                                 uint64_t &Res) const {
 559   Res = toRel(Rel)->VirtualAddress;
 560   return object_error::success;
 561 }
 562 error_code COFFObjectFile::getRelocationSymbol(DataRefImpl Rel,
 563                                                SymbolRef &Res) const {
 564   const coff_relocation* R = toRel(Rel);
 565   DataRefImpl Symb;
 566   Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
 567   Res = SymbolRef(Symb, this);
 568   return object_error::success;
 569 }
 570 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
 571                                              uint32_t &Res) const {
 572   const coff_relocation* R = toRel(Rel);
 573   Res = R->Type;
 574   return object_error::success;
 575 }
 576
 577 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
 578   case COFF::enum: res = #enum; break;
 579
 580 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
 581                                           SmallVectorImpl<char> &Result) const {
 582   const coff_relocation *reloc = toRel(Rel);
 583   StringRef res;
 584   switch (Header->Machine) {
 585   case COFF::IMAGE_FILE_MACHINE_AMD64:
 586     switch (reloc->Type) {
 587     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
 588     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
 589     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
 590     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
 591     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
 592     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
 593     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
 594     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
 595     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
 596     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
 597     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
 598     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
 599     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
 600     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
 601     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
 602     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
 603     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
 604     default:
 605       res = "Unknown";
 606     }
 607     break;
 608   case COFF::IMAGE_FILE_MACHINE_I386:
 609     switch (reloc->Type) {
 610     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
 611     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
 612     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
 613     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
 614     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
 615     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
 616     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
 617     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
 618     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
 619     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
 620     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
 621     default:
 622       res = "Unknown";
 623     }
 624     break;
 625   default:
 626     res = "Unknown";
 627   }
 628   Result.append(res.begin(), res.end());
 629   return object_error::success;
 630 }
 631
 632 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
 633
 634 error_code COFFObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
 635                                                        int64_t &Res) const {
 636   Res = 0;
 637   return object_error::success;
 638 }
 639 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
 640                                           SmallVectorImpl<char> &Result) const {
 641   const coff_relocation *reloc = toRel(Rel);
 642   const coff_symbol *symb;
 643   if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
 644   DataRefImpl sym;
 645   ::memset(&sym, 0, sizeof(sym));
 646   sym.p = reinterpret_cast<uintptr_t>(symb);
 647   StringRef symname;
 648   if (error_code ec = getSymbolName(sym, symname)) return ec;
 649   Result.append(symname.begin(), symname.end());
 650   return object_error::success;
 651 }
 652
 653 namespace llvm {
 654
 655   ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
 656     error_code ec;
 657     return new COFFObjectFile(Object, ec);
 658   }
 659
 660 } // end namespace llvm