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