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/ArrayRef.h"
  16 #include "llvm/ADT/SmallString.h"
  17 #include "llvm/ADT/StringSwitch.h"
  18 #include "llvm/ADT/Triple.h"
  19
  20 using namespace llvm;
  21 using namespace object;
  22
  23 namespace {
  24 using support::ulittle8_t;
  25 using support::ulittle16_t;
  26 using support::ulittle32_t;
  27 using support::little16_t;
  28 }
  29
  30 namespace {
  31 // Returns false if size is greater than the buffer size. And sets ec.
  32 bool checkSize(const MemoryBuffer *m, error_code &ec, uint64_t size) {
  33   if (m->getBufferSize() < size) {
  34     ec = object_error::unexpected_eof;
  35     return false;
  36   }
  37   return true;
  38 }
  39
  40 // Returns false if any bytes in [addr, addr + size) fall outsize of m.
  41 bool checkAddr(const MemoryBuffer *m,
  42                error_code &ec,
  43                uintptr_t addr,
  44                uint64_t size) {
  45   if (addr + size < addr ||
  46       addr + size < size ||
  47       addr + size > uintptr_t(m->getBufferEnd())) {
  48     ec = object_error::unexpected_eof;
  49     return false;
  50   }
  51   return true;
  52 }
  53 }
  54
  55 const coff_symbol *COFFObjectFile::toSymb(DataRefImpl Symb) const {
  56   const coff_symbol *addr = reinterpret_cast<const coff_symbol*>(Symb.p);
  57
  58 # ifndef NDEBUG
  59   // Verify that the symbol points to a valid entry in the symbol table.
  60   uintptr_t offset = uintptr_t(addr) - uintptr_t(base());
  61   if (offset < Header->PointerToSymbolTable
  62       || offset >= Header->PointerToSymbolTable
  63          + (Header->NumberOfSymbols * sizeof(coff_symbol)))
  64     report_fatal_error("Symbol was outside of symbol table.");
  65
  66   assert((offset - Header->PointerToSymbolTable) % sizeof(coff_symbol)
  67          == 0 && "Symbol did not point to the beginning of a symbol");
  68 # endif
  69
  70   return addr;
  71 }
  72
  73 const coff_section *COFFObjectFile::toSec(DataRefImpl Sec) const {
  74   const coff_section *addr = reinterpret_cast<const coff_section*>(Sec.p);
  75
  76 # ifndef NDEBUG
  77   // Verify that the section points to a valid entry in the section table.
  78   if (addr < SectionTable
  79       || addr >= (SectionTable + Header->NumberOfSections))
  80     report_fatal_error("Section was outside of section table.");
  81
  82   uintptr_t offset = uintptr_t(addr) - uintptr_t(SectionTable);
  83   assert(offset % sizeof(coff_section) == 0 &&
  84          "Section did not point to the beginning of a section");
  85 # endif
  86
  87   return addr;
  88 }
  89
  90 error_code COFFObjectFile::getSymbolNext(DataRefImpl Symb,
  91                                          SymbolRef &Result) const {
  92   const coff_symbol *symb = toSymb(Symb);
  93   symb += 1 + symb->NumberOfAuxSymbols;
  94   Symb.p = reinterpret_cast<uintptr_t>(symb);
  95   Result = SymbolRef(Symb, this);
  96   return object_error::success;
  97 }
  98
  99  error_code COFFObjectFile::getSymbolName(DataRefImpl Symb,
 100                                           StringRef &Result) const {
 101   const coff_symbol *symb = toSymb(Symb);
 102   return getSymbolName(symb, Result);
 103 }
 104
 105 error_code COFFObjectFile::getSymbolFileOffset(DataRefImpl Symb,
 106                                             uint64_t &Result) const {
 107   const coff_symbol *symb = toSymb(Symb);
 108   const coff_section *Section = NULL;
 109   if (error_code ec = getSection(symb->SectionNumber, Section))
 110     return ec;
 111   char Type;
 112   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 113     return ec;
 114   if (Type == 'U' || Type == 'w')
 115     Result = UnknownAddressOrSize;
 116   else if (Section)
 117     Result = Section->PointerToRawData + symb->Value;
 118   else
 119     Result = symb->Value;
 120   return object_error::success;
 121 }
 122
 123 error_code COFFObjectFile::getSymbolAddress(DataRefImpl Symb,
 124                                             uint64_t &Result) const {
 125   const coff_symbol *symb = toSymb(Symb);
 126   const coff_section *Section = NULL;
 127   if (error_code ec = getSection(symb->SectionNumber, Section))
 128     return ec;
 129   char Type;
 130   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 131     return ec;
 132   if (Type == 'U' || Type == 'w')
 133     Result = UnknownAddressOrSize;
 134   else if (Section)
 135     Result = Section->VirtualAddress + symb->Value;
 136   else
 137     Result = symb->Value;
 138   return object_error::success;
 139 }
 140
 141 error_code COFFObjectFile::getSymbolType(DataRefImpl Symb,
 142                                          SymbolRef::Type &Result) const {
 143   const coff_symbol *symb = toSymb(Symb);
 144   Result = SymbolRef::ST_Other;
 145   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
 146       symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
 147     Result = SymbolRef::ST_Unknown;
 148   } else {
 149     if (symb->getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION) {
 150       Result = SymbolRef::ST_Function;
 151     } else {
 152       char Type;
 153       if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 154         return ec;
 155       if (Type == 'r' || Type == 'R') {
 156         Result = SymbolRef::ST_Data;
 157       }
 158     }
 159   }
 160   return object_error::success;
 161 }
 162
 163 error_code COFFObjectFile::getSymbolFlags(DataRefImpl Symb,
 164                                           uint32_t &Result) const {
 165   const coff_symbol *symb = toSymb(Symb);
 166   Result = SymbolRef::SF_None;
 167
 168   // TODO: Correctly set SF_FormatSpecific, SF_ThreadLocal, SF_Common
 169
 170   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
 171       symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
 172     Result |= SymbolRef::SF_Undefined;
 173
 174   // TODO: This are certainly too restrictive.
 175   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
 176     Result |= SymbolRef::SF_Global;
 177
 178   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL)
 179     Result |= SymbolRef::SF_Weak;
 180
 181   if (symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE)
 182     Result |= SymbolRef::SF_Absolute;
 183
 184   return object_error::success;
 185 }
 186
 187 error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb,
 188                                          uint64_t &Result) const {
 189   // FIXME: Return the correct size. This requires looking at all the symbols
 190   //        in the same section as this symbol, and looking for either the next
 191   //        symbol, or the end of the section.
 192   const coff_symbol *symb = toSymb(Symb);
 193   const coff_section *Section = NULL;
 194   if (error_code ec = getSection(symb->SectionNumber, Section))
 195     return ec;
 196   char Type;
 197   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 198     return ec;
 199   if (Type == 'U' || Type == 'w')
 200     Result = UnknownAddressOrSize;
 201   else if (Section)
 202     Result = Section->SizeOfRawData - symb->Value;
 203   else
 204     Result = 0;
 205   return object_error::success;
 206 }
 207
 208 error_code COFFObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
 209                                                char &Result) const {
 210   const coff_symbol *symb = toSymb(Symb);
 211   StringRef name;
 212   if (error_code ec = getSymbolName(Symb, name))
 213     return ec;
 214   char ret = StringSwitch<char>(name)
 215     .StartsWith(".debug", 'N')
 216     .StartsWith(".sxdata", 'N')
 217     .Default('?');
 218
 219   if (ret != '?') {
 220     Result = ret;
 221     return object_error::success;
 222   }
 223
 224   uint32_t Characteristics = 0;
 225   if (symb->SectionNumber > 0) {
 226     const coff_section *Section = NULL;
 227     if (error_code ec = getSection(symb->SectionNumber, Section))
 228       return ec;
 229     Characteristics = Section->Characteristics;
 230   }
 231
 232   switch (symb->SectionNumber) {
 233   case COFF::IMAGE_SYM_UNDEFINED:
 234     // Check storage classes.
 235     if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) {
 236       Result = 'w';
 237       return object_error::success; // Don't do ::toupper.
 238     } else if (symb->Value != 0) // Check for common symbols.
 239       ret = 'c';
 240     else
 241       ret = 'u';
 242     break;
 243   case COFF::IMAGE_SYM_ABSOLUTE:
 244     ret = 'a';
 245     break;
 246   case COFF::IMAGE_SYM_DEBUG:
 247     ret = 'n';
 248     break;
 249   default:
 250     // Check section type.
 251     if (Characteristics & COFF::IMAGE_SCN_CNT_CODE)
 252       ret = 't';
 253     else if (  Characteristics & COFF::IMAGE_SCN_MEM_READ
 254             && ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
 255       ret = 'r';
 256     else if (Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
 257       ret = 'd';
 258     else if (Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
 259       ret = 'b';
 260     else if (Characteristics & COFF::IMAGE_SCN_LNK_INFO)
 261       ret = 'i';
 262
 263     // Check for section symbol.
 264     else if (  symb->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC
 265             && symb->Value == 0)
 266        ret = 's';
 267   }
 268
 269   if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
 270     ret = ::toupper(ret);
 271
 272   Result = ret;
 273   return object_error::success;
 274 }
 275
 276 error_code COFFObjectFile::getSymbolSection(DataRefImpl Symb,
 277                                             section_iterator &Result) const {
 278   const coff_symbol *symb = toSymb(Symb);
 279   if (symb->SectionNumber <= COFF::IMAGE_SYM_UNDEFINED)
 280     Result = end_sections();
 281   else {
 282     const coff_section *sec = 0;
 283     if (error_code ec = getSection(symb->SectionNumber, sec)) return ec;
 284     DataRefImpl Sec;
 285     std::memset(&Sec, 0, sizeof(Sec));
 286     Sec.p = reinterpret_cast<uintptr_t>(sec);
 287     Result = section_iterator(SectionRef(Sec, this));
 288   }
 289   return object_error::success;
 290 }
 291
 292 error_code COFFObjectFile::getSectionNext(DataRefImpl Sec,
 293                                           SectionRef &Result) const {
 294   const coff_section *sec = toSec(Sec);
 295   sec += 1;
 296   Sec.p = reinterpret_cast<uintptr_t>(sec);
 297   Result = SectionRef(Sec, this);
 298   return object_error::success;
 299 }
 300
 301 error_code COFFObjectFile::getSectionName(DataRefImpl Sec,
 302                                           StringRef &Result) const {
 303   const coff_section *sec = toSec(Sec);
 304   return getSectionName(sec, Result);
 305 }
 306
 307 error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec,
 308                                              uint64_t &Result) const {
 309   const coff_section *sec = toSec(Sec);
 310   Result = sec->VirtualAddress;
 311   return object_error::success;
 312 }
 313
 314 error_code COFFObjectFile::getSectionSize(DataRefImpl Sec,
 315                                           uint64_t &Result) const {
 316   const coff_section *sec = toSec(Sec);
 317   Result = sec->SizeOfRawData;
 318   return object_error::success;
 319 }
 320
 321 error_code COFFObjectFile::getSectionContents(DataRefImpl Sec,
 322                                               StringRef &Result) const {
 323   const coff_section *sec = toSec(Sec);
 324   ArrayRef<uint8_t> Res;
 325   error_code EC = getSectionContents(sec, Res);
 326   Result = StringRef(reinterpret_cast<const char*>(Res.data()), Res.size());
 327   return EC;
 328 }
 329
 330 error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec,
 331                                                uint64_t &Res) const {
 332   const coff_section *sec = toSec(Sec);
 333   if (!sec)
 334     return object_error::parse_failed;
 335   Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1);
 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   const coff_section *sec = toSec(Sec);
 364   const coff_symbol *symb = toSymb(Symb);
 365   const coff_section *symb_sec = 0;
 366   if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec;
 367   if (symb_sec == sec)
 368     Result = true;
 369   else
 370     Result = false;
 371   return object_error::success;
 372 }
 373
 374 relocation_iterator COFFObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
 375   const coff_section *sec = toSec(Sec);
 376   DataRefImpl ret;
 377   std::memset(&ret, 0, sizeof(ret));
 378   if (sec->NumberOfRelocations == 0)
 379     ret.p = 0;
 380   else
 381     ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations);
 382
 383   return relocation_iterator(RelocationRef(ret, this));
 384 }
 385
 386 relocation_iterator COFFObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
 387   const coff_section *sec = toSec(Sec);
 388   DataRefImpl ret;
 389   std::memset(&ret, 0, sizeof(ret));
 390   if (sec->NumberOfRelocations == 0)
 391     ret.p = 0;
 392   else
 393     ret.p = reinterpret_cast<uintptr_t>(
 394               reinterpret_cast<const coff_relocation*>(
 395                 base() + sec->PointerToRelocations)
 396               + sec->NumberOfRelocations);
 397
 398   return relocation_iterator(RelocationRef(ret, this));
 399 }
 400
 401 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
 402   : ObjectFile(Binary::ID_COFF, Object, ec)
 403   , Header(0)
 404   , SectionTable(0)
 405   , SymbolTable(0)
 406   , StringTable(0)
 407   , StringTableSize(0) {
 408   // Check that we at least have enough room for a header.
 409   if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
 410
 411   // The actual starting location of the COFF header in the file. This can be
 412   // non-zero in PE/COFF files.
 413   uint64_t HeaderStart = 0;
 414
 415   // Check if this is a PE/COFF file.
 416   if (base()[0] == 0x4d && base()[1] == 0x5a) {
 417     // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
 418     // PE signature to find 'normal' COFF header.
 419     if (!checkSize(Data, ec, 0x3c + 8)) return;
 420     HeaderStart = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c);
 421     // Check the PE header. ("PE\0\0")
 422     if (std::memcmp(base() + HeaderStart, "PE\0\0", 4) != 0) {
 423       ec = object_error::parse_failed;
 424       return;
 425     }
 426     HeaderStart += 4; // Skip the PE Header.
 427   }
 428
 429   Header = reinterpret_cast<const coff_file_header *>(base() + HeaderStart);
 430   if (!checkAddr(Data, ec, uintptr_t(Header), sizeof(coff_file_header)))
 431     return;
 432
 433   SectionTable =
 434     reinterpret_cast<const coff_section *>( base()
 435                                           + HeaderStart
 436                                           + sizeof(coff_file_header)
 437                                           + Header->SizeOfOptionalHeader);
 438   if (!checkAddr(Data, ec, uintptr_t(SectionTable),
 439                  Header->NumberOfSections * sizeof(coff_section)))
 440     return;
 441
 442   if (Header->PointerToSymbolTable != 0) {
 443     SymbolTable =
 444       reinterpret_cast<const coff_symbol *>(base()
 445                                             + Header->PointerToSymbolTable);
 446     if (!checkAddr(Data, ec, uintptr_t(SymbolTable),
 447                    Header->NumberOfSymbols * sizeof(coff_symbol)))
 448       return;
 449
 450     // Find string table.
 451     StringTable = reinterpret_cast<const char *>(base())
 452                   + Header->PointerToSymbolTable
 453                   + Header->NumberOfSymbols * sizeof(coff_symbol);
 454     if (!checkAddr(Data, ec, uintptr_t(StringTable), sizeof(ulittle32_t)))
 455       return;
 456
 457     StringTableSize = *reinterpret_cast<const ulittle32_t *>(StringTable);
 458     if (!checkAddr(Data, ec, uintptr_t(StringTable), StringTableSize))
 459       return;
 460     // Check that the string table is null terminated if has any in it.
 461     if (StringTableSize < 4
 462         || (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)) {
 463       ec = object_error::parse_failed;
 464       return;
 465     }
 466   }
 467
 468   ec = object_error::success;
 469 }
 470
 471 symbol_iterator COFFObjectFile::begin_symbols() const {
 472   DataRefImpl ret;
 473   std::memset(&ret, 0, sizeof(DataRefImpl));
 474   ret.p = reinterpret_cast<intptr_t>(SymbolTable);
 475   return symbol_iterator(SymbolRef(ret, this));
 476 }
 477
 478 symbol_iterator COFFObjectFile::end_symbols() const {
 479   // The symbol table ends where the string table begins.
 480   DataRefImpl ret;
 481   std::memset(&ret, 0, sizeof(DataRefImpl));
 482   ret.p = reinterpret_cast<intptr_t>(StringTable);
 483   return symbol_iterator(SymbolRef(ret, this));
 484 }
 485
 486 symbol_iterator COFFObjectFile::begin_dynamic_symbols() const {
 487   // TODO: implement
 488   report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
 489 }
 490
 491 symbol_iterator COFFObjectFile::end_dynamic_symbols() const {
 492   // TODO: implement
 493   report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
 494 }
 495
 496 library_iterator COFFObjectFile::begin_libraries_needed() const {
 497   // TODO: implement
 498   report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
 499 }
 500
 501 library_iterator COFFObjectFile::end_libraries_needed() const {
 502   // TODO: implement
 503   report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
 504 }
 505
 506 StringRef COFFObjectFile::getLoadName() const {
 507   // COFF does not have this field.
 508   return "";
 509 }
 510
 511
 512 section_iterator COFFObjectFile::begin_sections() const {
 513   DataRefImpl ret;
 514   std::memset(&ret, 0, sizeof(DataRefImpl));
 515   ret.p = reinterpret_cast<intptr_t>(SectionTable);
 516   return section_iterator(SectionRef(ret, this));
 517 }
 518
 519 section_iterator COFFObjectFile::end_sections() const {
 520   DataRefImpl ret;
 521   std::memset(&ret, 0, sizeof(DataRefImpl));
 522   ret.p = reinterpret_cast<intptr_t>(SectionTable + Header->NumberOfSections);
 523   return section_iterator(SectionRef(ret, this));
 524 }
 525
 526 uint8_t COFFObjectFile::getBytesInAddress() const {
 527   return getArch() == Triple::x86_64 ? 8 : 4;
 528 }
 529
 530 StringRef COFFObjectFile::getFileFormatName() const {
 531   switch(Header->Machine) {
 532   case COFF::IMAGE_FILE_MACHINE_I386:
 533     return "COFF-i386";
 534   case COFF::IMAGE_FILE_MACHINE_AMD64:
 535     return "COFF-x86-64";
 536   default:
 537     return "COFF-<unknown arch>";
 538   }
 539 }
 540
 541 unsigned COFFObjectFile::getArch() const {
 542   switch(Header->Machine) {
 543   case COFF::IMAGE_FILE_MACHINE_I386:
 544     return Triple::x86;
 545   case COFF::IMAGE_FILE_MACHINE_AMD64:
 546     return Triple::x86_64;
 547   default:
 548     return Triple::UnknownArch;
 549   }
 550 }
 551
 552 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
 553   Res = Header;
 554   return object_error::success;
 555 }
 556
 557 error_code COFFObjectFile::getSection(int32_t index,
 558                                       const coff_section *&Result) const {
 559   // Check for special index values.
 560   if (index == COFF::IMAGE_SYM_UNDEFINED ||
 561       index == COFF::IMAGE_SYM_ABSOLUTE ||
 562       index == COFF::IMAGE_SYM_DEBUG)
 563     Result = NULL;
 564   else if (index > 0 && index <= Header->NumberOfSections)
 565     // We already verified the section table data, so no need to check again.
 566     Result = SectionTable + (index - 1);
 567   else
 568     return object_error::parse_failed;
 569   return object_error::success;
 570 }
 571
 572 error_code COFFObjectFile::getString(uint32_t offset,
 573                                      StringRef &Result) const {
 574   if (StringTableSize <= 4)
 575     // Tried to get a string from an empty string table.
 576     return object_error::parse_failed;
 577   if (offset >= StringTableSize)
 578     return object_error::unexpected_eof;
 579   Result = StringRef(StringTable + offset);
 580   return object_error::success;
 581 }
 582
 583 error_code COFFObjectFile::getSymbol(uint32_t index,
 584                                      const coff_symbol *&Result) const {
 585   if (index < Header->NumberOfSymbols)
 586     Result = SymbolTable + index;
 587   else
 588     return object_error::parse_failed;
 589   return object_error::success;
 590 }
 591
 592 error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol,
 593                                          StringRef &Res) const {
 594   // Check for string table entry. First 4 bytes are 0.
 595   if (symbol->Name.Offset.Zeroes == 0) {
 596     uint32_t Offset = symbol->Name.Offset.Offset;
 597     if (error_code ec = getString(Offset, Res))
 598       return ec;
 599     return object_error::success;
 600   }
 601
 602   if (symbol->Name.ShortName[7] == 0)
 603     // Null terminated, let ::strlen figure out the length.
 604     Res = StringRef(symbol->Name.ShortName);
 605   else
 606     // Not null terminated, use all 8 bytes.
 607     Res = StringRef(symbol->Name.ShortName, 8);
 608   return object_error::success;
 609 }
 610
 611 error_code COFFObjectFile::getSectionName(const coff_section *Sec,
 612                                           StringRef &Res) const {
 613   StringRef Name;
 614   if (Sec->Name[7] == 0)
 615     // Null terminated, let ::strlen figure out the length.
 616     Name = Sec->Name;
 617   else
 618     // Not null terminated, use all 8 bytes.
 619     Name = StringRef(Sec->Name, 8);
 620
 621   // Check for string table entry. First byte is '/'.
 622   if (Name[0] == '/') {
 623     uint32_t Offset;
 624     if (Name.substr(1).getAsInteger(10, Offset))
 625       return object_error::parse_failed;
 626     if (error_code ec = getString(Offset, Name))
 627       return ec;
 628   }
 629
 630   Res = Name;
 631   return object_error::success;
 632 }
 633
 634 error_code COFFObjectFile::getSectionContents(const coff_section *Sec,
 635                                               ArrayRef<uint8_t> &Res) const {
 636   // The only thing that we need to verify is that the contents is contained
 637   // within the file bounds. We don't need to make sure it doesn't cover other
 638   // data, as there's nothing that says that is not allowed.
 639   uintptr_t ConStart = uintptr_t(base()) + Sec->PointerToRawData;
 640   uintptr_t ConEnd = ConStart + Sec->SizeOfRawData;
 641   if (ConEnd > uintptr_t(Data->getBufferEnd()))
 642     return object_error::parse_failed;
 643   Res = ArrayRef<uint8_t>(reinterpret_cast<const unsigned char*>(ConStart),
 644                           Sec->SizeOfRawData);
 645   return object_error::success;
 646 }
 647
 648 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
 649   return reinterpret_cast<const coff_relocation*>(Rel.p);
 650 }
 651 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
 652                                              RelocationRef &Res) const {
 653   Rel.p = reinterpret_cast<uintptr_t>(
 654             reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
 655   Res = RelocationRef(Rel, this);
 656   return object_error::success;
 657 }
 658 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
 659                                                 uint64_t &Res) const {
 660   Res = toRel(Rel)->VirtualAddress;
 661   return object_error::success;
 662 }
 663 error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel,
 664                                                uint64_t &Res) const {
 665   Res = toRel(Rel)->VirtualAddress;
 666   return object_error::success;
 667 }
 668 error_code COFFObjectFile::getRelocationSymbol(DataRefImpl Rel,
 669                                                SymbolRef &Res) const {
 670   const coff_relocation* R = toRel(Rel);
 671   DataRefImpl Symb;
 672   std::memset(&Symb, 0, sizeof(Symb));
 673   Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
 674   Res = SymbolRef(Symb, this);
 675   return object_error::success;
 676 }
 677 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
 678                                              uint64_t &Res) const {
 679   const coff_relocation* R = toRel(Rel);
 680   Res = R->Type;
 681   return object_error::success;
 682 }
 683
 684 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
 685   case COFF::enum: res = #enum; break;
 686
 687 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
 688                                           SmallVectorImpl<char> &Result) const {
 689   const coff_relocation *reloc = toRel(Rel);
 690   StringRef res;
 691   switch (Header->Machine) {
 692   case COFF::IMAGE_FILE_MACHINE_AMD64:
 693     switch (reloc->Type) {
 694     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
 695     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
 696     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
 697     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
 698     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
 699     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
 700     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
 701     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
 702     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
 703     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
 704     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
 705     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
 706     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
 707     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
 708     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
 709     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
 710     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
 711     default:
 712       res = "Unknown";
 713     }
 714     break;
 715   case COFF::IMAGE_FILE_MACHINE_I386:
 716     switch (reloc->Type) {
 717     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
 718     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
 719     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
 720     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
 721     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
 722     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
 723     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
 724     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
 725     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
 726     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
 727     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
 728     default:
 729       res = "Unknown";
 730     }
 731     break;
 732   default:
 733     res = "Unknown";
 734   }
 735   Result.append(res.begin(), res.end());
 736   return object_error::success;
 737 }
 738
 739 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
 740
 741 error_code COFFObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
 742                                                        int64_t &Res) const {
 743   Res = 0;
 744   return object_error::success;
 745 }
 746 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
 747                                           SmallVectorImpl<char> &Result) const {
 748   const coff_relocation *reloc = toRel(Rel);
 749   const coff_symbol *symb = 0;
 750   if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
 751   DataRefImpl sym;
 752   ::memset(&sym, 0, sizeof(sym));
 753   sym.p = reinterpret_cast<uintptr_t>(symb);
 754   StringRef symname;
 755   if (error_code ec = getSymbolName(sym, symname)) return ec;
 756   Result.append(symname.begin(), symname.end());
 757   return object_error::success;
 758 }
 759
 760 error_code COFFObjectFile::getLibraryNext(DataRefImpl LibData,
 761                                           LibraryRef &Result) const {
 762   report_fatal_error("getLibraryNext not implemented in COFFObjectFile");
 763 }
 764
 765 error_code COFFObjectFile::getLibraryPath(DataRefImpl LibData,
 766                                           StringRef &Result) const {
 767   report_fatal_error("getLibraryPath not implemented in COFFObjectFile");
 768 }
 769
 770 namespace llvm {
 771
 772   ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
 773     error_code ec;
 774     return new COFFObjectFile(Object, ec);
 775   }
 776
 777 } // end namespace llvm