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   return getSymbolName(symb, Result);
 102 }
 103
 104 error_code COFFObjectFile::getSymbolOffset(DataRefImpl Symb,
 105                                             uint64_t &Result) const {
 106   const coff_symbol *symb = toSymb(Symb);
 107   const coff_section *Section = NULL;
 108   if (error_code ec = getSection(symb->SectionNumber, Section))
 109     return ec;
 110   char Type;
 111   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 112     return ec;
 113   if (Type == 'U' || Type == 'w')
 114     Result = UnknownAddressOrSize;
 115   else if (Section)
 116     Result = Section->VirtualAddress + symb->Value;
 117   else
 118     Result = symb->Value;
 119   return object_error::success;
 120 }
 121
 122 error_code COFFObjectFile::getSymbolAddress(DataRefImpl Symb,
 123                                             uint64_t &Result) const {
 124   const coff_symbol *symb = toSymb(Symb);
 125   const coff_section *Section = NULL;
 126   if (error_code ec = getSection(symb->SectionNumber, Section))
 127     return ec;
 128   char Type;
 129   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 130     return ec;
 131   if (Type == 'U' || Type == 'w')
 132     Result = UnknownAddressOrSize;
 133   else if (Section)
 134     Result = reinterpret_cast<uintptr_t>(base() +
 135                                          Section->PointerToRawData +
 136                                          symb->Value);
 137   else
 138     Result = reinterpret_cast<uintptr_t>(base() + symb->Value);
 139   return object_error::success;
 140 }
 141
 142 error_code COFFObjectFile::getSymbolType(DataRefImpl Symb,
 143                                          SymbolRef::Type &Result) const {
 144   const coff_symbol *symb = toSymb(Symb);
 145   Result = SymbolRef::ST_Other;
 146   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
 147       symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
 148     Result = SymbolRef::ST_External;
 149   } else {
 150     if (symb->getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION) {
 151       Result = SymbolRef::ST_Function;
 152     } else {
 153       char Type;
 154       if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 155         return ec;
 156       if (Type == 'r' || Type == 'R') {
 157         Result = SymbolRef::ST_Data;
 158       }
 159     }
 160   }
 161   return object_error::success;
 162 }
 163
 164 error_code COFFObjectFile::isSymbolGlobal(DataRefImpl Symb,
 165                                           bool &Result) const {
 166   const coff_symbol *symb = toSymb(Symb);
 167   Result = (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL);
 168   return object_error::success;
 169 }
 170
 171 error_code COFFObjectFile::isSymbolWeak(DataRefImpl Symb,
 172                                           bool &Result) const {
 173   const coff_symbol *symb = toSymb(Symb);
 174   Result = (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL);
 175   return object_error::success;
 176 }
 177
 178 error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb,
 179                                          uint64_t &Result) const {
 180   // FIXME: Return the correct size. This requires looking at all the symbols
 181   //        in the same section as this symbol, and looking for either the next
 182   //        symbol, or the end of the section.
 183   const coff_symbol *symb = toSymb(Symb);
 184   const coff_section *Section = NULL;
 185   if (error_code ec = getSection(symb->SectionNumber, Section))
 186     return ec;
 187   char Type;
 188   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 189     return ec;
 190   if (Type == 'U' || Type == 'w')
 191     Result = UnknownAddressOrSize;
 192   else if (Section)
 193     Result = Section->SizeOfRawData - symb->Value;
 194   else
 195     Result = 0;
 196   return object_error::success;
 197 }
 198
 199 error_code COFFObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
 200                                                char &Result) const {
 201   const coff_symbol *symb = toSymb(Symb);
 202   StringRef name;
 203   if (error_code ec = getSymbolName(Symb, name))
 204     return ec;
 205   char ret = StringSwitch<char>(name)
 206     .StartsWith(".debug", 'N')
 207     .StartsWith(".sxdata", 'N')
 208     .Default('?');
 209
 210   if (ret != '?') {
 211     Result = ret;
 212     return object_error::success;
 213   }
 214
 215   uint32_t Characteristics = 0;
 216   if (symb->SectionNumber > 0) {
 217     const coff_section *Section = NULL;
 218     if (error_code ec = getSection(symb->SectionNumber, Section))
 219       return ec;
 220     Characteristics = Section->Characteristics;
 221   }
 222
 223   switch (symb->SectionNumber) {
 224   case COFF::IMAGE_SYM_UNDEFINED:
 225     // Check storage classes.
 226     if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) {
 227       Result = 'w';
 228       return object_error::success; // Don't do ::toupper.
 229     } else
 230       ret = 'u';
 231     break;
 232   case COFF::IMAGE_SYM_ABSOLUTE:
 233     ret = 'a';
 234     break;
 235   case COFF::IMAGE_SYM_DEBUG:
 236     ret = 'n';
 237     break;
 238   default:
 239     // Check section type.
 240     if (Characteristics & COFF::IMAGE_SCN_CNT_CODE)
 241       ret = 't';
 242     else if (  Characteristics & COFF::IMAGE_SCN_MEM_READ
 243             && ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
 244       ret = 'r';
 245     else if (Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
 246       ret = 'd';
 247     else if (Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
 248       ret = 'b';
 249     else if (Characteristics & COFF::IMAGE_SCN_LNK_INFO)
 250       ret = 'i';
 251
 252     // Check for section symbol.
 253     else if (  symb->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC
 254             && symb->Value == 0)
 255        ret = 's';
 256   }
 257
 258   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
 259     ret = ::toupper(ret);
 260
 261   Result = ret;
 262   return object_error::success;
 263 }
 264
 265 error_code COFFObjectFile::isSymbolInternal(DataRefImpl Symb,
 266                                             bool &Result) const {
 267   Result = false;
 268   return object_error::success;
 269 }
 270
 271 error_code COFFObjectFile::isSymbolAbsolute(DataRefImpl Symb,
 272                                             bool &Result) const {
 273   const coff_symbol *symb = toSymb(Symb);
 274   Result = symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE;
 275   return object_error::success;
 276 }
 277
 278 error_code COFFObjectFile::getSymbolSection(DataRefImpl Symb,
 279                                             section_iterator &Result) const {
 280   const coff_symbol *symb = toSymb(Symb);
 281   if (symb->SectionNumber <= COFF::IMAGE_SYM_UNDEFINED)
 282     Result = end_sections();
 283   else {
 284     const coff_section *sec;
 285     if (error_code ec = getSection(symb->SectionNumber, sec)) return ec;
 286     DataRefImpl Sec;
 287     std::memset(&Sec, 0, sizeof(Sec));
 288     Sec.p = reinterpret_cast<uintptr_t>(sec);
 289     Result = section_iterator(SectionRef(Sec, this));
 290   }
 291   return object_error::success;
 292 }
 293
 294 error_code COFFObjectFile::getSectionNext(DataRefImpl Sec,
 295                                           SectionRef &Result) const {
 296   const coff_section *sec = toSec(Sec);
 297   sec += 1;
 298   Sec.p = reinterpret_cast<uintptr_t>(sec);
 299   Result = SectionRef(Sec, this);
 300   return object_error::success;
 301 }
 302
 303 error_code COFFObjectFile::getSectionName(DataRefImpl Sec,
 304                                           StringRef &Result) const {
 305   const coff_section *sec = toSec(Sec);
 306   StringRef name;
 307   if (sec->Name[7] == 0)
 308     // Null terminated, let ::strlen figure out the length.
 309     name = sec->Name;
 310   else
 311     // Not null terminated, use all 8 bytes.
 312     name = StringRef(sec->Name, 8);
 313
 314   // Check for string table entry. First byte is '/'.
 315   if (name[0] == '/') {
 316     uint32_t Offset;
 317     name.substr(1).getAsInteger(10, Offset);
 318     if (error_code ec = getString(Offset, name))
 319       return ec;
 320   }
 321
 322   Result = name;
 323   return object_error::success;
 324 }
 325
 326 error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec,
 327                                              uint64_t &Result) const {
 328   const coff_section *sec = toSec(Sec);
 329   Result = sec->VirtualAddress;
 330   return object_error::success;
 331 }
 332
 333 error_code COFFObjectFile::getSectionSize(DataRefImpl Sec,
 334                                           uint64_t &Result) const {
 335   const coff_section *sec = toSec(Sec);
 336   Result = sec->SizeOfRawData;
 337   return object_error::success;
 338 }
 339
 340 error_code COFFObjectFile::getSectionContents(DataRefImpl Sec,
 341                                               StringRef &Result) const {
 342   const coff_section *sec = toSec(Sec);
 343   // The only thing that we need to verify is that the contents is contained
 344   // within the file bounds. We don't need to make sure it doesn't cover other
 345   // data, as there's nothing that says that is not allowed.
 346   uintptr_t con_start = uintptr_t(base()) + sec->PointerToRawData;
 347   uintptr_t con_end = con_start + sec->SizeOfRawData;
 348   if (con_end > uintptr_t(Data->getBufferEnd()))
 349     return object_error::parse_failed;
 350   Result = StringRef(reinterpret_cast<const char*>(con_start),
 351                      sec->SizeOfRawData);
 352   return object_error::success;
 353 }
 354
 355 error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec,
 356                                                uint64_t &Res) const {
 357   const coff_section *sec = toSec(Sec);
 358   if (!sec)
 359     return object_error::parse_failed;
 360   Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1);
 361   return object_error::success;
 362 }
 363
 364 error_code COFFObjectFile::isSectionText(DataRefImpl Sec,
 365                                          bool &Result) const {
 366   const coff_section *sec = toSec(Sec);
 367   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
 368   return object_error::success;
 369 }
 370
 371 error_code COFFObjectFile::isSectionData(DataRefImpl Sec,
 372                                          bool &Result) const {
 373   const coff_section *sec = toSec(Sec);
 374   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
 375   return object_error::success;
 376 }
 377
 378 error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec,
 379                                         bool &Result) const {
 380   const coff_section *sec = toSec(Sec);
 381   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
 382   return object_error::success;
 383 }
 384
 385 error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
 386                                                  DataRefImpl Symb,
 387                                                  bool &Result) const {
 388   const coff_section *sec = toSec(Sec);
 389   const coff_symbol *symb = toSymb(Symb);
 390   const coff_section *symb_sec;
 391   if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec;
 392   if (symb_sec == sec)
 393     Result = true;
 394   else
 395     Result = false;
 396   return object_error::success;
 397 }
 398
 399 relocation_iterator COFFObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
 400   const coff_section *sec = toSec(Sec);
 401   DataRefImpl ret;
 402   std::memset(&ret, 0, sizeof(ret));
 403   if (sec->NumberOfRelocations == 0)
 404     ret.p = 0;
 405   else
 406     ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations);
 407
 408   return relocation_iterator(RelocationRef(ret, this));
 409 }
 410
 411 relocation_iterator COFFObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
 412   const coff_section *sec = toSec(Sec);
 413   DataRefImpl ret;
 414   std::memset(&ret, 0, sizeof(ret));
 415   if (sec->NumberOfRelocations == 0)
 416     ret.p = 0;
 417   else
 418     ret.p = reinterpret_cast<uintptr_t>(
 419               reinterpret_cast<const coff_relocation*>(
 420                 base() + sec->PointerToRelocations)
 421               + sec->NumberOfRelocations);
 422
 423   return relocation_iterator(RelocationRef(ret, this));
 424 }
 425
 426 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
 427   : ObjectFile(Binary::isCOFF, Object, ec)
 428   , Header(0)
 429   , SectionTable(0)
 430   , SymbolTable(0)
 431   , StringTable(0)
 432   , StringTableSize(0) {
 433   // Check that we at least have enough room for a header.
 434   if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
 435
 436   // The actual starting location of the COFF header in the file. This can be
 437   // non-zero in PE/COFF files.
 438   uint64_t HeaderStart = 0;
 439
 440   // Check if this is a PE/COFF file.
 441   if (base()[0] == 0x4d && base()[1] == 0x5a) {
 442     // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
 443     // PE signature to find 'normal' COFF header.
 444     if (!checkSize(Data, ec, 0x3c + 8)) return;
 445     HeaderStart = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c);
 446     // Check the PE header. ("PE\0\0")
 447     if (std::memcmp(base() + HeaderStart, "PE\0\0", 4) != 0) {
 448       ec = object_error::parse_failed;
 449       return;
 450     }
 451     HeaderStart += 4; // Skip the PE Header.
 452   }
 453
 454   Header = reinterpret_cast<const coff_file_header *>(base() + HeaderStart);
 455   if (!checkAddr(Data, ec, uintptr_t(Header), sizeof(coff_file_header)))
 456     return;
 457
 458   SectionTable =
 459     reinterpret_cast<const coff_section *>( base()
 460                                           + HeaderStart
 461                                           + sizeof(coff_file_header)
 462                                           + Header->SizeOfOptionalHeader);
 463   if (!checkAddr(Data, ec, uintptr_t(SectionTable),
 464                  Header->NumberOfSections * sizeof(coff_section)))
 465     return;
 466
 467   if (Header->PointerToSymbolTable != 0) {
 468     SymbolTable =
 469       reinterpret_cast<const coff_symbol *>(base()
 470                                             + Header->PointerToSymbolTable);
 471     if (!checkAddr(Data, ec, uintptr_t(SymbolTable),
 472                    Header->NumberOfSymbols * sizeof(coff_symbol)))
 473       return;
 474
 475     // Find string table.
 476     StringTable = reinterpret_cast<const char *>(base())
 477                   + Header->PointerToSymbolTable
 478                   + Header->NumberOfSymbols * sizeof(coff_symbol);
 479     if (!checkAddr(Data, ec, uintptr_t(StringTable), sizeof(ulittle32_t)))
 480       return;
 481
 482     StringTableSize = *reinterpret_cast<const ulittle32_t *>(StringTable);
 483     if (!checkAddr(Data, ec, uintptr_t(StringTable), StringTableSize))
 484       return;
 485     // Check that the string table is null terminated if has any in it.
 486     if (StringTableSize < 4
 487         || (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)) {
 488       ec = object_error::parse_failed;
 489       return;
 490     }
 491   }
 492
 493   ec = object_error::success;
 494 }
 495
 496 symbol_iterator COFFObjectFile::begin_symbols() const {
 497   DataRefImpl ret;
 498   std::memset(&ret, 0, sizeof(DataRefImpl));
 499   ret.p = reinterpret_cast<intptr_t>(SymbolTable);
 500   return symbol_iterator(SymbolRef(ret, this));
 501 }
 502
 503 symbol_iterator COFFObjectFile::end_symbols() const {
 504   // The symbol table ends where the string table begins.
 505   DataRefImpl ret;
 506   std::memset(&ret, 0, sizeof(DataRefImpl));
 507   ret.p = reinterpret_cast<intptr_t>(StringTable);
 508   return symbol_iterator(SymbolRef(ret, this));
 509 }
 510
 511 section_iterator COFFObjectFile::begin_sections() const {
 512   DataRefImpl ret;
 513   std::memset(&ret, 0, sizeof(DataRefImpl));
 514   ret.p = reinterpret_cast<intptr_t>(SectionTable);
 515   return section_iterator(SectionRef(ret, this));
 516 }
 517
 518 section_iterator COFFObjectFile::end_sections() const {
 519   DataRefImpl ret;
 520   std::memset(&ret, 0, sizeof(DataRefImpl));
 521   ret.p = reinterpret_cast<intptr_t>(SectionTable + Header->NumberOfSections);
 522   return section_iterator(SectionRef(ret, this));
 523 }
 524
 525 uint8_t COFFObjectFile::getBytesInAddress() const {
 526   return getArch() == Triple::x86_64 ? 8 : 4;
 527 }
 528
 529 StringRef COFFObjectFile::getFileFormatName() const {
 530   switch(Header->Machine) {
 531   case COFF::IMAGE_FILE_MACHINE_I386:
 532     return "COFF-i386";
 533   case COFF::IMAGE_FILE_MACHINE_AMD64:
 534     return "COFF-x86-64";
 535   default:
 536     return "COFF-<unknown arch>";
 537   }
 538 }
 539
 540 unsigned COFFObjectFile::getArch() const {
 541   switch(Header->Machine) {
 542   case COFF::IMAGE_FILE_MACHINE_I386:
 543     return Triple::x86;
 544   case COFF::IMAGE_FILE_MACHINE_AMD64:
 545     return Triple::x86_64;
 546   default:
 547     return Triple::UnknownArch;
 548   }
 549 }
 550
 551 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
 552   Res = Header;
 553   return object_error::success;
 554 }
 555
 556 error_code COFFObjectFile::getSection(int32_t index,
 557                                       const coff_section *&Result) const {
 558   // Check for special index values.
 559   if (index == COFF::IMAGE_SYM_UNDEFINED ||
 560       index == COFF::IMAGE_SYM_ABSOLUTE ||
 561       index == COFF::IMAGE_SYM_DEBUG)
 562     Result = NULL;
 563   else if (index > 0 && index <= Header->NumberOfSections)
 564     // We already verified the section table data, so no need to check again.
 565     Result = SectionTable + (index - 1);
 566   else
 567     return object_error::parse_failed;
 568   return object_error::success;
 569 }
 570
 571 error_code COFFObjectFile::getString(uint32_t offset,
 572                                      StringRef &Result) const {
 573   if (StringTableSize <= 4)
 574     // Tried to get a string from an empty string table.
 575     return object_error::parse_failed;
 576   if (offset >= StringTableSize)
 577     return object_error::unexpected_eof;
 578   Result = StringRef(StringTable + offset);
 579   return object_error::success;
 580 }
 581
 582 error_code COFFObjectFile::getSymbol(uint32_t index,
 583                                      const coff_symbol *&Result) const {
 584   if (index < Header->NumberOfSymbols)
 585     Result = SymbolTable + index;
 586   else
 587     return object_error::parse_failed;
 588   return object_error::success;
 589 }
 590
 591 error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol,
 592                                          StringRef &Res) const {
 593   // Check for string table entry. First 4 bytes are 0.
 594   if (symbol->Name.Offset.Zeroes == 0) {
 595     uint32_t Offset = symbol->Name.Offset.Offset;
 596     if (error_code ec = getString(Offset, Res))
 597       return ec;
 598     return object_error::success;
 599   }
 600
 601   if (symbol->Name.ShortName[7] == 0)
 602     // Null terminated, let ::strlen figure out the length.
 603     Res = StringRef(symbol->Name.ShortName);
 604   else
 605     // Not null terminated, use all 8 bytes.
 606     Res = StringRef(symbol->Name.ShortName, 8);
 607   return object_error::success;
 608 }
 609
 610 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
 611   return reinterpret_cast<const coff_relocation*>(Rel.p);
 612 }
 613 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
 614                                              RelocationRef &Res) const {
 615   Rel.p = reinterpret_cast<uintptr_t>(
 616             reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
 617   Res = RelocationRef(Rel, this);
 618   return object_error::success;
 619 }
 620 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
 621                                                 uint64_t &Res) const {
 622   Res = toRel(Rel)->VirtualAddress;
 623   return object_error::success;
 624 }
 625 error_code COFFObjectFile::getRelocationSymbol(DataRefImpl Rel,
 626                                                SymbolRef &Res) const {
 627   const coff_relocation* R = toRel(Rel);
 628   DataRefImpl Symb;
 629   std::memset(&Symb, 0, sizeof(Symb));
 630   Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
 631   Res = SymbolRef(Symb, this);
 632   return object_error::success;
 633 }
 634 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
 635                                              uint64_t &Res) const {
 636   const coff_relocation* R = toRel(Rel);
 637   Res = R->Type;
 638   return object_error::success;
 639 }
 640
 641 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
 642   case COFF::enum: res = #enum; break;
 643
 644 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
 645                                           SmallVectorImpl<char> &Result) const {
 646   const coff_relocation *reloc = toRel(Rel);
 647   StringRef res;
 648   switch (Header->Machine) {
 649   case COFF::IMAGE_FILE_MACHINE_AMD64:
 650     switch (reloc->Type) {
 651     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
 652     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
 653     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
 654     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
 655     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
 656     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
 657     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
 658     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
 659     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
 660     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
 661     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
 662     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
 663     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
 664     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
 665     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
 666     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
 667     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
 668     default:
 669       res = "Unknown";
 670     }
 671     break;
 672   case COFF::IMAGE_FILE_MACHINE_I386:
 673     switch (reloc->Type) {
 674     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
 675     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
 676     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
 677     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
 678     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
 679     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
 680     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
 681     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
 682     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
 683     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
 684     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
 685     default:
 686       res = "Unknown";
 687     }
 688     break;
 689   default:
 690     res = "Unknown";
 691   }
 692   Result.append(res.begin(), res.end());
 693   return object_error::success;
 694 }
 695
 696 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
 697
 698 error_code COFFObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
 699                                                        int64_t &Res) const {
 700   Res = 0;
 701   return object_error::success;
 702 }
 703 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
 704                                           SmallVectorImpl<char> &Result) const {
 705   const coff_relocation *reloc = toRel(Rel);
 706   const coff_symbol *symb = 0;
 707   if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
 708   DataRefImpl sym;
 709   ::memset(&sym, 0, sizeof(sym));
 710   sym.p = reinterpret_cast<uintptr_t>(symb);
 711   StringRef symname;
 712   if (error_code ec = getSymbolName(sym, symname)) return ec;
 713   Result.append(symname.begin(), symname.end());
 714   return object_error::success;
 715 }
 716
 717 namespace llvm {
 718
 719   ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
 720     error_code ec;
 721     return new COFFObjectFile(Object, ec);
 722   }
 723
 724 } // end namespace llvm