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     Sec.p = reinterpret_cast<uintptr_t>(sec);
 288     Result = section_iterator(SectionRef(Sec, this));
 289   }
 290   return object_error::success;
 291 }
 292
 293 error_code COFFObjectFile::getSectionNext(DataRefImpl Sec,
 294                                           SectionRef &Result) const {
 295   const coff_section *sec = toSec(Sec);
 296   sec += 1;
 297   Sec.p = reinterpret_cast<uintptr_t>(sec);
 298   Result = SectionRef(Sec, this);
 299   return object_error::success;
 300 }
 301
 302 error_code COFFObjectFile::getSectionName(DataRefImpl Sec,
 303                                           StringRef &Result) const {
 304   const coff_section *sec = toSec(Sec);
 305   StringRef name;
 306   if (sec->Name[7] == 0)
 307     // Null terminated, let ::strlen figure out the length.
 308     name = sec->Name;
 309   else
 310     // Not null terminated, use all 8 bytes.
 311     name = StringRef(sec->Name, 8);
 312
 313   // Check for string table entry. First byte is '/'.
 314   if (name[0] == '/') {
 315     uint32_t Offset;
 316     name.substr(1).getAsInteger(10, Offset);
 317     if (error_code ec = getString(Offset, name))
 318       return ec;
 319   }
 320
 321   Result = name;
 322   return object_error::success;
 323 }
 324
 325 error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec,
 326                                              uint64_t &Result) const {
 327   const coff_section *sec = toSec(Sec);
 328   Result = sec->VirtualAddress;
 329   return object_error::success;
 330 }
 331
 332 error_code COFFObjectFile::getSectionSize(DataRefImpl Sec,
 333                                           uint64_t &Result) const {
 334   const coff_section *sec = toSec(Sec);
 335   Result = sec->SizeOfRawData;
 336   return object_error::success;
 337 }
 338
 339 error_code COFFObjectFile::getSectionContents(DataRefImpl Sec,
 340                                               StringRef &Result) const {
 341   const coff_section *sec = toSec(Sec);
 342   // The only thing that we need to verify is that the contents is contained
 343   // within the file bounds. We don't need to make sure it doesn't cover other
 344   // data, as there's nothing that says that is not allowed.
 345   uintptr_t con_start = uintptr_t(base()) + sec->PointerToRawData;
 346   uintptr_t con_end = con_start + sec->SizeOfRawData;
 347   if (con_end >= uintptr_t(Data->getBufferEnd()))
 348     return object_error::parse_failed;
 349   Result = StringRef(reinterpret_cast<const char*>(con_start),
 350                      sec->SizeOfRawData);
 351   return object_error::success;
 352 }
 353
 354 error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec,
 355                                                uint64_t &Res) const {
 356   const coff_section *sec = toSec(Sec);
 357   if (!sec)
 358     return object_error::parse_failed;
 359   Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1);
 360   return object_error::success;
 361 }
 362
 363 error_code COFFObjectFile::isSectionText(DataRefImpl Sec,
 364                                          bool &Result) const {
 365   const coff_section *sec = toSec(Sec);
 366   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
 367   return object_error::success;
 368 }
 369
 370 error_code COFFObjectFile::isSectionData(DataRefImpl Sec,
 371                                          bool &Result) const {
 372   const coff_section *sec = toSec(Sec);
 373   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
 374   return object_error::success;
 375 }
 376
 377 error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec,
 378                                         bool &Result) const {
 379   const coff_section *sec = toSec(Sec);
 380   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
 381   return object_error::success;
 382 }
 383
 384 error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
 385                                                  DataRefImpl Symb,
 386                                                  bool &Result) const {
 387   const coff_section *sec = toSec(Sec);
 388   const coff_symbol *symb = toSymb(Symb);
 389   const coff_section *symb_sec;
 390   if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec;
 391   if (symb_sec == sec)
 392     Result = true;
 393   else
 394     Result = false;
 395   return object_error::success;
 396 }
 397
 398 relocation_iterator COFFObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
 399   const coff_section *sec = toSec(Sec);
 400   DataRefImpl ret;
 401   std::memset(&ret, 0, sizeof(ret));
 402   if (sec->NumberOfRelocations == 0)
 403     ret.p = 0;
 404   else
 405     ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations);
 406
 407   return relocation_iterator(RelocationRef(ret, this));
 408 }
 409
 410 relocation_iterator COFFObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
 411   const coff_section *sec = toSec(Sec);
 412   DataRefImpl ret;
 413   std::memset(&ret, 0, sizeof(ret));
 414   if (sec->NumberOfRelocations == 0)
 415     ret.p = 0;
 416   else
 417     ret.p = reinterpret_cast<uintptr_t>(
 418               reinterpret_cast<const coff_relocation*>(
 419                 base() + sec->PointerToRelocations)
 420               + sec->NumberOfRelocations);
 421
 422   return relocation_iterator(RelocationRef(ret, this));
 423 }
 424
 425 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
 426   : ObjectFile(Binary::isCOFF, Object, ec) {
 427   // Check that we at least have enough room for a header.
 428   if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
 429
 430   // The actual starting location of the COFF header in the file. This can be
 431   // non-zero in PE/COFF files.
 432   uint64_t HeaderStart = 0;
 433
 434   // Check if this is a PE/COFF file.
 435   if (base()[0] == 0x4d && base()[1] == 0x5a) {
 436     // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
 437     // PE signature to find 'normal' COFF header.
 438     if (!checkSize(Data, ec, 0x3c + 8)) return;
 439     HeaderStart += *reinterpret_cast<const ulittle32_t *>(base() + 0x3c);
 440     // Check the PE header. ("PE\0\0")
 441     if (std::memcmp(base() + HeaderStart, "PE\0\0", 4) != 0) {
 442       ec = object_error::parse_failed;
 443       return;
 444     }
 445     HeaderStart += 4; // Skip the PE Header.
 446   }
 447
 448   Header = reinterpret_cast<const coff_file_header *>(base() + HeaderStart);
 449   if (!checkAddr(Data, ec, uintptr_t(Header), sizeof(coff_file_header)))
 450     return;
 451
 452   SectionTable =
 453     reinterpret_cast<const coff_section *>( base()
 454                                           + HeaderStart
 455                                           + sizeof(coff_file_header)
 456                                           + Header->SizeOfOptionalHeader);
 457   if (!checkAddr(Data, ec, uintptr_t(SectionTable),
 458                  Header->NumberOfSections * sizeof(coff_section)))
 459     return;
 460
 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   ec = object_error::success;
 486 }
 487
 488 symbol_iterator COFFObjectFile::begin_symbols() const {
 489   DataRefImpl ret;
 490   std::memset(&ret, 0, sizeof(DataRefImpl));
 491   ret.p = reinterpret_cast<intptr_t>(SymbolTable);
 492   return symbol_iterator(SymbolRef(ret, this));
 493 }
 494
 495 symbol_iterator COFFObjectFile::end_symbols() const {
 496   // The symbol table ends where the string table begins.
 497   DataRefImpl ret;
 498   std::memset(&ret, 0, sizeof(DataRefImpl));
 499   ret.p = reinterpret_cast<intptr_t>(StringTable);
 500   return symbol_iterator(SymbolRef(ret, this));
 501 }
 502
 503 section_iterator COFFObjectFile::begin_sections() const {
 504   DataRefImpl ret;
 505   std::memset(&ret, 0, sizeof(DataRefImpl));
 506   ret.p = reinterpret_cast<intptr_t>(SectionTable);
 507   return section_iterator(SectionRef(ret, this));
 508 }
 509
 510 section_iterator COFFObjectFile::end_sections() const {
 511   DataRefImpl ret;
 512   std::memset(&ret, 0, sizeof(DataRefImpl));
 513   ret.p = reinterpret_cast<intptr_t>(SectionTable + Header->NumberOfSections);
 514   return section_iterator(SectionRef(ret, this));
 515 }
 516
 517 uint8_t COFFObjectFile::getBytesInAddress() const {
 518   return getArch() == Triple::x86_64 ? 8 : 4;
 519 }
 520
 521 StringRef COFFObjectFile::getFileFormatName() const {
 522   switch(Header->Machine) {
 523   case COFF::IMAGE_FILE_MACHINE_I386:
 524     return "COFF-i386";
 525   case COFF::IMAGE_FILE_MACHINE_AMD64:
 526     return "COFF-x86-64";
 527   default:
 528     return "COFF-<unknown arch>";
 529   }
 530 }
 531
 532 unsigned COFFObjectFile::getArch() const {
 533   switch(Header->Machine) {
 534   case COFF::IMAGE_FILE_MACHINE_I386:
 535     return Triple::x86;
 536   case COFF::IMAGE_FILE_MACHINE_AMD64:
 537     return Triple::x86_64;
 538   default:
 539     return Triple::UnknownArch;
 540   }
 541 }
 542
 543 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
 544   Res = Header;
 545   return object_error::success;
 546 }
 547
 548 error_code COFFObjectFile::getSection(int32_t index,
 549                                       const coff_section *&Result) const {
 550   // Check for special index values.
 551   if (index == COFF::IMAGE_SYM_UNDEFINED ||
 552       index == COFF::IMAGE_SYM_ABSOLUTE ||
 553       index == COFF::IMAGE_SYM_DEBUG)
 554     Result = NULL;
 555   else if (index > 0 && index <= Header->NumberOfSections)
 556     // We already verified the section table data, so no need to check again.
 557     Result = SectionTable + (index - 1);
 558   else
 559     return object_error::parse_failed;
 560   return object_error::success;
 561 }
 562
 563 error_code COFFObjectFile::getString(uint32_t offset,
 564                                      StringRef &Result) const {
 565   if (StringTableSize <= 4)
 566     // Tried to get a string from an empty string table.
 567     return object_error::parse_failed;
 568   if (offset >= StringTableSize)
 569     return object_error::unexpected_eof;
 570   Result = StringRef(StringTable + offset);
 571   return object_error::success;
 572 }
 573
 574 error_code COFFObjectFile::getSymbol(uint32_t index,
 575                                      const coff_symbol *&Result) const {
 576   if (index < Header->NumberOfSymbols)
 577     Result = SymbolTable + index;
 578   else
 579     return object_error::parse_failed;
 580   return object_error::success;
 581 }
 582
 583 error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol,
 584                                          StringRef &Res) const {
 585   // Check for string table entry. First 4 bytes are 0.
 586   if (symbol->Name.Offset.Zeroes == 0) {
 587     uint32_t Offset = symbol->Name.Offset.Offset;
 588     if (error_code ec = getString(Offset, Res))
 589       return ec;
 590     return object_error::success;
 591   }
 592
 593   if (symbol->Name.ShortName[7] == 0)
 594     // Null terminated, let ::strlen figure out the length.
 595     Res = StringRef(symbol->Name.ShortName);
 596   else
 597     // Not null terminated, use all 8 bytes.
 598     Res = StringRef(symbol->Name.ShortName, 8);
 599   return object_error::success;
 600 }
 601
 602 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
 603   return reinterpret_cast<const coff_relocation*>(Rel.p);
 604 }
 605 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
 606                                              RelocationRef &Res) const {
 607   Rel.p = reinterpret_cast<uintptr_t>(
 608             reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
 609   Res = RelocationRef(Rel, this);
 610   return object_error::success;
 611 }
 612 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
 613                                                 uint64_t &Res) const {
 614   Res = toRel(Rel)->VirtualAddress;
 615   return object_error::success;
 616 }
 617 error_code COFFObjectFile::getRelocationSymbol(DataRefImpl Rel,
 618                                                SymbolRef &Res) const {
 619   const coff_relocation* R = toRel(Rel);
 620   DataRefImpl Symb;
 621   Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
 622   Res = SymbolRef(Symb, this);
 623   return object_error::success;
 624 }
 625 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
 626                                              uint64_t &Res) const {
 627   const coff_relocation* R = toRel(Rel);
 628   Res = R->Type;
 629   return object_error::success;
 630 }
 631
 632 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
 633   case COFF::enum: res = #enum; break;
 634
 635 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
 636                                           SmallVectorImpl<char> &Result) const {
 637   const coff_relocation *reloc = toRel(Rel);
 638   StringRef res;
 639   switch (Header->Machine) {
 640   case COFF::IMAGE_FILE_MACHINE_AMD64:
 641     switch (reloc->Type) {
 642     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
 643     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
 644     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
 645     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
 646     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
 647     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
 648     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
 649     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
 650     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
 651     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
 652     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
 653     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
 654     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
 655     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
 656     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
 657     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
 658     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
 659     default:
 660       res = "Unknown";
 661     }
 662     break;
 663   case COFF::IMAGE_FILE_MACHINE_I386:
 664     switch (reloc->Type) {
 665     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
 666     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
 667     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
 668     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
 669     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
 670     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
 671     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
 672     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
 673     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
 674     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
 675     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
 676     default:
 677       res = "Unknown";
 678     }
 679     break;
 680   default:
 681     res = "Unknown";
 682   }
 683   Result.append(res.begin(), res.end());
 684   return object_error::success;
 685 }
 686
 687 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
 688
 689 error_code COFFObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
 690                                                        int64_t &Res) const {
 691   Res = 0;
 692   return object_error::success;
 693 }
 694 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
 695                                           SmallVectorImpl<char> &Result) const {
 696   const coff_relocation *reloc = toRel(Rel);
 697   const coff_symbol *symb = 0;
 698   if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
 699   DataRefImpl sym;
 700   ::memset(&sym, 0, sizeof(sym));
 701   sym.p = reinterpret_cast<uintptr_t>(symb);
 702   StringRef symname;
 703   if (error_code ec = getSymbolName(sym, symname)) return ec;
 704   Result.append(symname.begin(), symname.end());
 705   return object_error::success;
 706 }
 707
 708 namespace llvm {
 709
 710   ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
 711     error_code ec;
 712     return new COFFObjectFile(Object, ec);
 713   }
 714
 715 } // end namespace llvm