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::getSymbolFileOffset(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->PointerToRawData + 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 = Section->VirtualAddress + symb->Value;
 135   else
 136     Result = symb->Value;
 137   return object_error::success;
 138 }
 139
 140 error_code COFFObjectFile::getSymbolType(DataRefImpl Symb,
 141                                          SymbolRef::Type &Result) const {
 142   const coff_symbol *symb = toSymb(Symb);
 143   Result = SymbolRef::ST_Other;
 144   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
 145       symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
 146     Result = SymbolRef::ST_External;
 147   } else {
 148     if (symb->getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION) {
 149       Result = SymbolRef::ST_Function;
 150     } else {
 151       char Type;
 152       if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 153         return ec;
 154       if (Type == 'r' || Type == 'R') {
 155         Result = SymbolRef::ST_Data;
 156       }
 157     }
 158   }
 159   return object_error::success;
 160 }
 161
 162 error_code COFFObjectFile::getSymbolFlags(DataRefImpl Symb,
 163                                           uint32_t &Result) const {
 164   const coff_symbol *symb = toSymb(Symb);
 165   Result = SymbolRef::SF_None;
 166
 167   // TODO: Set SF_FormatSpecific.
 168
 169   // TODO: This are certainly too restrictive.
 170   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
 171     Result |= SymbolRef::SF_Global;
 172
 173   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL)
 174     Result |= SymbolRef::SF_Weak;
 175
 176   if (symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE)
 177     Result |= SymbolRef::SF_Absolute;
 178
 179   return object_error::success;
 180 }
 181
 182 error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb,
 183                                          uint64_t &Result) const {
 184   // FIXME: Return the correct size. This requires looking at all the symbols
 185   //        in the same section as this symbol, and looking for either the next
 186   //        symbol, or the end of the section.
 187   const coff_symbol *symb = toSymb(Symb);
 188   const coff_section *Section = NULL;
 189   if (error_code ec = getSection(symb->SectionNumber, Section))
 190     return ec;
 191   char Type;
 192   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 193     return ec;
 194   if (Type == 'U' || Type == 'w')
 195     Result = UnknownAddressOrSize;
 196   else if (Section)
 197     Result = Section->SizeOfRawData - symb->Value;
 198   else
 199     Result = 0;
 200   return object_error::success;
 201 }
 202
 203 error_code COFFObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
 204                                                char &Result) const {
 205   const coff_symbol *symb = toSymb(Symb);
 206   StringRef name;
 207   if (error_code ec = getSymbolName(Symb, name))
 208     return ec;
 209   char ret = StringSwitch<char>(name)
 210     .StartsWith(".debug", 'N')
 211     .StartsWith(".sxdata", 'N')
 212     .Default('?');
 213
 214   if (ret != '?') {
 215     Result = ret;
 216     return object_error::success;
 217   }
 218
 219   uint32_t Characteristics = 0;
 220   if (symb->SectionNumber > 0) {
 221     const coff_section *Section = NULL;
 222     if (error_code ec = getSection(symb->SectionNumber, Section))
 223       return ec;
 224     Characteristics = Section->Characteristics;
 225   }
 226
 227   switch (symb->SectionNumber) {
 228   case COFF::IMAGE_SYM_UNDEFINED:
 229     // Check storage classes.
 230     if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) {
 231       Result = 'w';
 232       return object_error::success; // Don't do ::toupper.
 233     } else if (symb->Value != 0) // Check for common symbols.
 234       ret = 'c';
 235     else
 236       ret = 'u';
 237     break;
 238   case COFF::IMAGE_SYM_ABSOLUTE:
 239     ret = 'a';
 240     break;
 241   case COFF::IMAGE_SYM_DEBUG:
 242     ret = 'n';
 243     break;
 244   default:
 245     // Check section type.
 246     if (Characteristics & COFF::IMAGE_SCN_CNT_CODE)
 247       ret = 't';
 248     else if (  Characteristics & COFF::IMAGE_SCN_MEM_READ
 249             && ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
 250       ret = 'r';
 251     else if (Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
 252       ret = 'd';
 253     else if (Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
 254       ret = 'b';
 255     else if (Characteristics & COFF::IMAGE_SCN_LNK_INFO)
 256       ret = 'i';
 257
 258     // Check for section symbol.
 259     else if (  symb->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC
 260             && symb->Value == 0)
 261        ret = 's';
 262   }
 263
 264   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
 265     ret = ::toupper(ret);
 266
 267   Result = ret;
 268   return object_error::success;
 269 }
 270
 271 error_code COFFObjectFile::getSymbolSection(DataRefImpl Symb,
 272                                             section_iterator &Result) const {
 273   const coff_symbol *symb = toSymb(Symb);
 274   if (symb->SectionNumber <= COFF::IMAGE_SYM_UNDEFINED)
 275     Result = end_sections();
 276   else {
 277     const coff_section *sec = 0;
 278     if (error_code ec = getSection(symb->SectionNumber, sec)) return ec;
 279     DataRefImpl Sec;
 280     std::memset(&Sec, 0, sizeof(Sec));
 281     Sec.p = reinterpret_cast<uintptr_t>(sec);
 282     Result = section_iterator(SectionRef(Sec, this));
 283   }
 284   return object_error::success;
 285 }
 286
 287 error_code COFFObjectFile::getSectionNext(DataRefImpl Sec,
 288                                           SectionRef &Result) const {
 289   const coff_section *sec = toSec(Sec);
 290   sec += 1;
 291   Sec.p = reinterpret_cast<uintptr_t>(sec);
 292   Result = SectionRef(Sec, this);
 293   return object_error::success;
 294 }
 295
 296 error_code COFFObjectFile::getSectionName(DataRefImpl Sec,
 297                                           StringRef &Result) const {
 298   const coff_section *sec = toSec(Sec);
 299   StringRef name;
 300   if (sec->Name[7] == 0)
 301     // Null terminated, let ::strlen figure out the length.
 302     name = sec->Name;
 303   else
 304     // Not null terminated, use all 8 bytes.
 305     name = StringRef(sec->Name, 8);
 306
 307   // Check for string table entry. First byte is '/'.
 308   if (name[0] == '/') {
 309     uint32_t Offset;
 310     name.substr(1).getAsInteger(10, Offset);
 311     if (error_code ec = getString(Offset, name))
 312       return ec;
 313   }
 314
 315   Result = name;
 316   return object_error::success;
 317 }
 318
 319 error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec,
 320                                              uint64_t &Result) const {
 321   const coff_section *sec = toSec(Sec);
 322   Result = sec->VirtualAddress;
 323   return object_error::success;
 324 }
 325
 326 error_code COFFObjectFile::getSectionSize(DataRefImpl Sec,
 327                                           uint64_t &Result) const {
 328   const coff_section *sec = toSec(Sec);
 329   Result = sec->SizeOfRawData;
 330   return object_error::success;
 331 }
 332
 333 error_code COFFObjectFile::getSectionContents(DataRefImpl Sec,
 334                                               StringRef &Result) const {
 335   const coff_section *sec = toSec(Sec);
 336   // The only thing that we need to verify is that the contents is contained
 337   // within the file bounds. We don't need to make sure it doesn't cover other
 338   // data, as there's nothing that says that is not allowed.
 339   uintptr_t con_start = uintptr_t(base()) + sec->PointerToRawData;
 340   uintptr_t con_end = con_start + sec->SizeOfRawData;
 341   if (con_end > uintptr_t(Data->getBufferEnd()))
 342     return object_error::parse_failed;
 343   Result = StringRef(reinterpret_cast<const char*>(con_start),
 344                      sec->SizeOfRawData);
 345   return object_error::success;
 346 }
 347
 348 error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec,
 349                                                uint64_t &Res) const {
 350   const coff_section *sec = toSec(Sec);
 351   if (!sec)
 352     return object_error::parse_failed;
 353   Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1);
 354   return object_error::success;
 355 }
 356
 357 error_code COFFObjectFile::isSectionText(DataRefImpl Sec,
 358                                          bool &Result) const {
 359   const coff_section *sec = toSec(Sec);
 360   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
 361   return object_error::success;
 362 }
 363
 364 error_code COFFObjectFile::isSectionData(DataRefImpl Sec,
 365                                          bool &Result) const {
 366   const coff_section *sec = toSec(Sec);
 367   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
 368   return object_error::success;
 369 }
 370
 371 error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec,
 372                                         bool &Result) const {
 373   const coff_section *sec = toSec(Sec);
 374   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
 375   return object_error::success;
 376 }
 377
 378 error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
 379                                                  DataRefImpl Symb,
 380                                                  bool &Result) const {
 381   const coff_section *sec = toSec(Sec);
 382   const coff_symbol *symb = toSymb(Symb);
 383   const coff_section *symb_sec = 0;
 384   if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec;
 385   if (symb_sec == sec)
 386     Result = true;
 387   else
 388     Result = false;
 389   return object_error::success;
 390 }
 391
 392 relocation_iterator COFFObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
 393   const coff_section *sec = toSec(Sec);
 394   DataRefImpl ret;
 395   std::memset(&ret, 0, sizeof(ret));
 396   if (sec->NumberOfRelocations == 0)
 397     ret.p = 0;
 398   else
 399     ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations);
 400
 401   return relocation_iterator(RelocationRef(ret, this));
 402 }
 403
 404 relocation_iterator COFFObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
 405   const coff_section *sec = toSec(Sec);
 406   DataRefImpl ret;
 407   std::memset(&ret, 0, sizeof(ret));
 408   if (sec->NumberOfRelocations == 0)
 409     ret.p = 0;
 410   else
 411     ret.p = reinterpret_cast<uintptr_t>(
 412               reinterpret_cast<const coff_relocation*>(
 413                 base() + sec->PointerToRelocations)
 414               + sec->NumberOfRelocations);
 415
 416   return relocation_iterator(RelocationRef(ret, this));
 417 }
 418
 419 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
 420   : ObjectFile(Binary::isCOFF, Object, ec)
 421   , Header(0)
 422   , SectionTable(0)
 423   , SymbolTable(0)
 424   , StringTable(0)
 425   , StringTableSize(0) {
 426   // Check that we at least have enough room for a header.
 427   if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
 428
 429   // The actual starting location of the COFF header in the file. This can be
 430   // non-zero in PE/COFF files.
 431   uint64_t HeaderStart = 0;
 432
 433   // Check if this is a PE/COFF file.
 434   if (base()[0] == 0x4d && base()[1] == 0x5a) {
 435     // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
 436     // PE signature to find 'normal' COFF header.
 437     if (!checkSize(Data, ec, 0x3c + 8)) return;
 438     HeaderStart = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c);
 439     // Check the PE header. ("PE\0\0")
 440     if (std::memcmp(base() + HeaderStart, "PE\0\0", 4) != 0) {
 441       ec = object_error::parse_failed;
 442       return;
 443     }
 444     HeaderStart += 4; // Skip the PE Header.
 445   }
 446
 447   Header = reinterpret_cast<const coff_file_header *>(base() + HeaderStart);
 448   if (!checkAddr(Data, ec, uintptr_t(Header), sizeof(coff_file_header)))
 449     return;
 450
 451   SectionTable =
 452     reinterpret_cast<const coff_section *>( base()
 453                                           + HeaderStart
 454                                           + sizeof(coff_file_header)
 455                                           + Header->SizeOfOptionalHeader);
 456   if (!checkAddr(Data, ec, uintptr_t(SectionTable),
 457                  Header->NumberOfSections * sizeof(coff_section)))
 458     return;
 459
 460   if (Header->PointerToSymbolTable != 0) {
 461     SymbolTable =
 462       reinterpret_cast<const coff_symbol *>(base()
 463                                             + Header->PointerToSymbolTable);
 464     if (!checkAddr(Data, ec, uintptr_t(SymbolTable),
 465                    Header->NumberOfSymbols * sizeof(coff_symbol)))
 466       return;
 467
 468     // Find string table.
 469     StringTable = reinterpret_cast<const char *>(base())
 470                   + Header->PointerToSymbolTable
 471                   + Header->NumberOfSymbols * sizeof(coff_symbol);
 472     if (!checkAddr(Data, ec, uintptr_t(StringTable), sizeof(ulittle32_t)))
 473       return;
 474
 475     StringTableSize = *reinterpret_cast<const ulittle32_t *>(StringTable);
 476     if (!checkAddr(Data, ec, uintptr_t(StringTable), StringTableSize))
 477       return;
 478     // Check that the string table is null terminated if has any in it.
 479     if (StringTableSize < 4
 480         || (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)) {
 481       ec = object_error::parse_failed;
 482       return;
 483     }
 484   }
 485
 486   ec = object_error::success;
 487 }
 488
 489 symbol_iterator COFFObjectFile::begin_symbols() const {
 490   DataRefImpl ret;
 491   std::memset(&ret, 0, sizeof(DataRefImpl));
 492   ret.p = reinterpret_cast<intptr_t>(SymbolTable);
 493   return symbol_iterator(SymbolRef(ret, this));
 494 }
 495
 496 symbol_iterator COFFObjectFile::end_symbols() const {
 497   // The symbol table ends where the string table begins.
 498   DataRefImpl ret;
 499   std::memset(&ret, 0, sizeof(DataRefImpl));
 500   ret.p = reinterpret_cast<intptr_t>(StringTable);
 501   return symbol_iterator(SymbolRef(ret, this));
 502 }
 503
 504 symbol_iterator COFFObjectFile::begin_dynamic_symbols() const {
 505   // TODO: implement
 506   report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
 507 }
 508
 509 symbol_iterator COFFObjectFile::end_dynamic_symbols() const {
 510   // TODO: implement
 511   report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
 512 }
 513
 514 section_iterator COFFObjectFile::begin_sections() const {
 515   DataRefImpl ret;
 516   std::memset(&ret, 0, sizeof(DataRefImpl));
 517   ret.p = reinterpret_cast<intptr_t>(SectionTable);
 518   return section_iterator(SectionRef(ret, this));
 519 }
 520
 521 section_iterator COFFObjectFile::end_sections() const {
 522   DataRefImpl ret;
 523   std::memset(&ret, 0, sizeof(DataRefImpl));
 524   ret.p = reinterpret_cast<intptr_t>(SectionTable + Header->NumberOfSections);
 525   return section_iterator(SectionRef(ret, this));
 526 }
 527
 528 uint8_t COFFObjectFile::getBytesInAddress() const {
 529   return getArch() == Triple::x86_64 ? 8 : 4;
 530 }
 531
 532 StringRef COFFObjectFile::getFileFormatName() const {
 533   switch(Header->Machine) {
 534   case COFF::IMAGE_FILE_MACHINE_I386:
 535     return "COFF-i386";
 536   case COFF::IMAGE_FILE_MACHINE_AMD64:
 537     return "COFF-x86-64";
 538   default:
 539     return "COFF-<unknown arch>";
 540   }
 541 }
 542
 543 unsigned COFFObjectFile::getArch() const {
 544   switch(Header->Machine) {
 545   case COFF::IMAGE_FILE_MACHINE_I386:
 546     return Triple::x86;
 547   case COFF::IMAGE_FILE_MACHINE_AMD64:
 548     return Triple::x86_64;
 549   default:
 550     return Triple::UnknownArch;
 551   }
 552 }
 553
 554 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
 555   Res = Header;
 556   return object_error::success;
 557 }
 558
 559 error_code COFFObjectFile::getSection(int32_t index,
 560                                       const coff_section *&Result) const {
 561   // Check for special index values.
 562   if (index == COFF::IMAGE_SYM_UNDEFINED ||
 563       index == COFF::IMAGE_SYM_ABSOLUTE ||
 564       index == COFF::IMAGE_SYM_DEBUG)
 565     Result = NULL;
 566   else if (index > 0 && index <= Header->NumberOfSections)
 567     // We already verified the section table data, so no need to check again.
 568     Result = SectionTable + (index - 1);
 569   else
 570     return object_error::parse_failed;
 571   return object_error::success;
 572 }
 573
 574 error_code COFFObjectFile::getString(uint32_t offset,
 575                                      StringRef &Result) const {
 576   if (StringTableSize <= 4)
 577     // Tried to get a string from an empty string table.
 578     return object_error::parse_failed;
 579   if (offset >= StringTableSize)
 580     return object_error::unexpected_eof;
 581   Result = StringRef(StringTable + offset);
 582   return object_error::success;
 583 }
 584
 585 error_code COFFObjectFile::getSymbol(uint32_t index,
 586                                      const coff_symbol *&Result) const {
 587   if (index < Header->NumberOfSymbols)
 588     Result = SymbolTable + index;
 589   else
 590     return object_error::parse_failed;
 591   return object_error::success;
 592 }
 593
 594 error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol,
 595                                          StringRef &Res) const {
 596   // Check for string table entry. First 4 bytes are 0.
 597   if (symbol->Name.Offset.Zeroes == 0) {
 598     uint32_t Offset = symbol->Name.Offset.Offset;
 599     if (error_code ec = getString(Offset, Res))
 600       return ec;
 601     return object_error::success;
 602   }
 603
 604   if (symbol->Name.ShortName[7] == 0)
 605     // Null terminated, let ::strlen figure out the length.
 606     Res = StringRef(symbol->Name.ShortName);
 607   else
 608     // Not null terminated, use all 8 bytes.
 609     Res = StringRef(symbol->Name.ShortName, 8);
 610   return object_error::success;
 611 }
 612
 613 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
 614   return reinterpret_cast<const coff_relocation*>(Rel.p);
 615 }
 616 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
 617                                              RelocationRef &Res) const {
 618   Rel.p = reinterpret_cast<uintptr_t>(
 619             reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
 620   Res = RelocationRef(Rel, this);
 621   return object_error::success;
 622 }
 623 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
 624                                                 uint64_t &Res) const {
 625   Res = toRel(Rel)->VirtualAddress;
 626   return object_error::success;
 627 }
 628 error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel,
 629                                                uint64_t &Res) const {
 630   Res = toRel(Rel)->VirtualAddress;
 631   return object_error::success;
 632 }
 633 error_code COFFObjectFile::getRelocationSymbol(DataRefImpl Rel,
 634                                                SymbolRef &Res) const {
 635   const coff_relocation* R = toRel(Rel);
 636   DataRefImpl Symb;
 637   std::memset(&Symb, 0, sizeof(Symb));
 638   Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
 639   Res = SymbolRef(Symb, this);
 640   return object_error::success;
 641 }
 642 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
 643                                              uint64_t &Res) const {
 644   const coff_relocation* R = toRel(Rel);
 645   Res = R->Type;
 646   return object_error::success;
 647 }
 648
 649 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
 650   case COFF::enum: res = #enum; break;
 651
 652 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
 653                                           SmallVectorImpl<char> &Result) const {
 654   const coff_relocation *reloc = toRel(Rel);
 655   StringRef res;
 656   switch (Header->Machine) {
 657   case COFF::IMAGE_FILE_MACHINE_AMD64:
 658     switch (reloc->Type) {
 659     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
 660     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
 661     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
 662     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
 663     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
 664     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
 665     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
 666     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
 667     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
 668     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
 669     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
 670     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
 671     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
 672     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
 673     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
 674     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
 675     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
 676     default:
 677       res = "Unknown";
 678     }
 679     break;
 680   case COFF::IMAGE_FILE_MACHINE_I386:
 681     switch (reloc->Type) {
 682     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
 683     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
 684     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
 685     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
 686     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
 687     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
 688     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
 689     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
 690     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
 691     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
 692     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
 693     default:
 694       res = "Unknown";
 695     }
 696     break;
 697   default:
 698     res = "Unknown";
 699   }
 700   Result.append(res.begin(), res.end());
 701   return object_error::success;
 702 }
 703
 704 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
 705
 706 error_code COFFObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
 707                                                        int64_t &Res) const {
 708   Res = 0;
 709   return object_error::success;
 710 }
 711 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
 712                                           SmallVectorImpl<char> &Result) const {
 713   const coff_relocation *reloc = toRel(Rel);
 714   const coff_symbol *symb = 0;
 715   if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
 716   DataRefImpl sym;
 717   ::memset(&sym, 0, sizeof(sym));
 718   sym.p = reinterpret_cast<uintptr_t>(symb);
 719   StringRef symname;
 720   if (error_code ec = getSymbolName(sym, symname)) return ec;
 721   Result.append(symname.begin(), symname.end());
 722   return object_error::success;
 723 }
 724
 725 namespace llvm {
 726
 727   ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
 728     error_code ec;
 729     return new COFFObjectFile(Object, ec);
 730   }
 731
 732 } // end namespace llvm