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::isSymbolGlobal(DataRefImpl Symb,
 163                                           bool &Result) const {
 164   const coff_symbol *symb = toSymb(Symb);
 165   Result = (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL);
 166   return object_error::success;
 167 }
 168
 169 error_code COFFObjectFile::isSymbolWeak(DataRefImpl Symb,
 170                                           bool &Result) const {
 171   const coff_symbol *symb = toSymb(Symb);
 172   Result = (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL);
 173   return object_error::success;
 174 }
 175
 176 error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb,
 177                                          uint64_t &Result) const {
 178   // FIXME: Return the correct size. This requires looking at all the symbols
 179   //        in the same section as this symbol, and looking for either the next
 180   //        symbol, or the end of the section.
 181   const coff_symbol *symb = toSymb(Symb);
 182   const coff_section *Section = NULL;
 183   if (error_code ec = getSection(symb->SectionNumber, Section))
 184     return ec;
 185   char Type;
 186   if (error_code ec = getSymbolNMTypeChar(Symb, Type))
 187     return ec;
 188   if (Type == 'U' || Type == 'w')
 189     Result = UnknownAddressOrSize;
 190   else if (Section)
 191     Result = Section->SizeOfRawData - symb->Value;
 192   else
 193     Result = 0;
 194   return object_error::success;
 195 }
 196
 197 error_code COFFObjectFile::getSymbolNMTypeChar(DataRefImpl Symb,
 198                                                char &Result) const {
 199   const coff_symbol *symb = toSymb(Symb);
 200   StringRef name;
 201   if (error_code ec = getSymbolName(Symb, name))
 202     return ec;
 203   char ret = StringSwitch<char>(name)
 204     .StartsWith(".debug", 'N')
 205     .StartsWith(".sxdata", 'N')
 206     .Default('?');
 207
 208   if (ret != '?') {
 209     Result = ret;
 210     return object_error::success;
 211   }
 212
 213   uint32_t Characteristics = 0;
 214   if (symb->SectionNumber > 0) {
 215     const coff_section *Section = NULL;
 216     if (error_code ec = getSection(symb->SectionNumber, Section))
 217       return ec;
 218     Characteristics = Section->Characteristics;
 219   }
 220
 221   switch (symb->SectionNumber) {
 222   case COFF::IMAGE_SYM_UNDEFINED:
 223     // Check storage classes.
 224     if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) {
 225       Result = 'w';
 226       return object_error::success; // Don't do ::toupper.
 227     } else if (symb->Value != 0) // Check for common symbols.
 228       ret = 'c';
 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 = 0;
 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 = 0;
 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::getRelocationOffset(DataRefImpl Rel,
 626                                                uint64_t &Res) const {
 627   Res = toRel(Rel)->VirtualAddress;
 628   return object_error::success;
 629 }
 630 error_code COFFObjectFile::getRelocationSymbol(DataRefImpl Rel,
 631                                                SymbolRef &Res) const {
 632   const coff_relocation* R = toRel(Rel);
 633   DataRefImpl Symb;
 634   std::memset(&Symb, 0, sizeof(Symb));
 635   Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
 636   Res = SymbolRef(Symb, this);
 637   return object_error::success;
 638 }
 639 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
 640                                              uint64_t &Res) const {
 641   const coff_relocation* R = toRel(Rel);
 642   Res = R->Type;
 643   return object_error::success;
 644 }
 645
 646 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
 647   case COFF::enum: res = #enum; break;
 648
 649 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
 650                                           SmallVectorImpl<char> &Result) const {
 651   const coff_relocation *reloc = toRel(Rel);
 652   StringRef res;
 653   switch (Header->Machine) {
 654   case COFF::IMAGE_FILE_MACHINE_AMD64:
 655     switch (reloc->Type) {
 656     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
 657     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
 658     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
 659     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
 660     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
 661     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
 662     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
 663     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
 664     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
 665     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
 666     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
 667     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
 668     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
 669     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
 670     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
 671     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
 672     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
 673     default:
 674       res = "Unknown";
 675     }
 676     break;
 677   case COFF::IMAGE_FILE_MACHINE_I386:
 678     switch (reloc->Type) {
 679     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
 680     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
 681     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
 682     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
 683     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
 684     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
 685     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
 686     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
 687     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
 688     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
 689     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
 690     default:
 691       res = "Unknown";
 692     }
 693     break;
 694   default:
 695     res = "Unknown";
 696   }
 697   Result.append(res.begin(), res.end());
 698   return object_error::success;
 699 }
 700
 701 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
 702
 703 error_code COFFObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
 704                                                        int64_t &Res) const {
 705   Res = 0;
 706   return object_error::success;
 707 }
 708 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
 709                                           SmallVectorImpl<char> &Result) const {
 710   const coff_relocation *reloc = toRel(Rel);
 711   const coff_symbol *symb = 0;
 712   if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
 713   DataRefImpl sym;
 714   ::memset(&sym, 0, sizeof(sym));
 715   sym.p = reinterpret_cast<uintptr_t>(symb);
 716   StringRef symname;
 717   if (error_code ec = getSymbolName(sym, symname)) return ec;
 718   Result.append(symname.begin(), symname.end());
 719   return object_error::success;
 720 }
 721
 722 namespace llvm {
 723
 724   ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
 725     error_code ec;
 726     return new COFFObjectFile(Object, ec);
 727   }
 728
 729 } // end namespace llvm