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      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     Sec.p = reinterpret_cast<uintptr_t>(sec);
    286     Result = section_iterator(SectionRef(Sec, this));
    287   }
    288   return object_error::success;
    289 }
    290 
    291 error_code COFFObjectFile::getSectionNext(DataRefImpl Sec,
    292                                           SectionRef &Result) const {
    293   const coff_section *sec = toSec(Sec);
    294   sec += 1;
    295   Sec.p = reinterpret_cast<uintptr_t>(sec);
    296   Result = SectionRef(Sec, this);
    297   return object_error::success;
    298 }
    299 
    300 error_code COFFObjectFile::getSectionName(DataRefImpl Sec,
    301                                           StringRef &Result) const {
    302   const coff_section *sec = toSec(Sec);
    303   return getSectionName(sec, Result);
    304 }
    305 
    306 error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec,
    307                                              uint64_t &Result) const {
    308   const coff_section *sec = toSec(Sec);
    309   Result = sec->VirtualAddress;
    310   return object_error::success;
    311 }
    312 
    313 error_code COFFObjectFile::getSectionSize(DataRefImpl Sec,
    314                                           uint64_t &Result) const {
    315   const coff_section *sec = toSec(Sec);
    316   Result = sec->SizeOfRawData;
    317   return object_error::success;
    318 }
    319 
    320 error_code COFFObjectFile::getSectionContents(DataRefImpl Sec,
    321                                               StringRef &Result) const {
    322   const coff_section *sec = toSec(Sec);
    323   ArrayRef<uint8_t> Res;
    324   error_code EC = getSectionContents(sec, Res);
    325   Result = StringRef(reinterpret_cast<const char*>(Res.data()), Res.size());
    326   return EC;
    327 }
    328 
    329 error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec,
    330                                                uint64_t &Res) const {
    331   const coff_section *sec = toSec(Sec);
    332   if (!sec)
    333     return object_error::parse_failed;
    334   Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1);
    335   return object_error::success;
    336 }
    337 
    338 error_code COFFObjectFile::isSectionText(DataRefImpl Sec,
    339                                          bool &Result) const {
    340   const coff_section *sec = toSec(Sec);
    341   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
    342   return object_error::success;
    343 }
    344 
    345 error_code COFFObjectFile::isSectionData(DataRefImpl Sec,
    346                                          bool &Result) const {
    347   const coff_section *sec = toSec(Sec);
    348   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
    349   return object_error::success;
    350 }
    351 
    352 error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec,
    353                                         bool &Result) const {
    354   const coff_section *sec = toSec(Sec);
    355   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
    356   return object_error::success;
    357 }
    358 
    359 error_code COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
    360                                                          bool &Result) const {
    361   // FIXME: Unimplemented
    362   Result = true;
    363   return object_error::success;
    364 }
    365 
    366 error_code COFFObjectFile::isSectionVirtual(DataRefImpl Sec,
    367                                            bool &Result) const {
    368   const coff_section *sec = toSec(Sec);
    369   Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
    370   return object_error::success;
    371 }
    372 
    373 error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Sec,
    374                                              bool &Result) const {
    375   // FIXME: Unimplemented
    376   Result = false;
    377   return object_error::success;
    378 }
    379 
    380 error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
    381                                                  DataRefImpl Symb,
    382                                                  bool &Result) const {
    383   const coff_section *sec = toSec(Sec);
    384   const coff_symbol *symb = toSymb(Symb);
    385   const coff_section *symb_sec = 0;
    386   if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec;
    387   if (symb_sec == sec)
    388     Result = true;
    389   else
    390     Result = false;
    391   return object_error::success;
    392 }
    393 
    394 relocation_iterator COFFObjectFile::getSectionRelBegin(DataRefImpl Sec) const {
    395   const coff_section *sec = toSec(Sec);
    396   DataRefImpl ret;
    397   if (sec->NumberOfRelocations == 0)
    398     ret.p = 0;
    399   else
    400     ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations);
    401 
    402   return relocation_iterator(RelocationRef(ret, this));
    403 }
    404 
    405 relocation_iterator COFFObjectFile::getSectionRelEnd(DataRefImpl Sec) const {
    406   const coff_section *sec = toSec(Sec);
    407   DataRefImpl ret;
    408   if (sec->NumberOfRelocations == 0)
    409     ret.p = 0;
    410   else
    411     ret.p = reinterpret_cast<uintptr_t>(
    412               reinterpret_cast<const coff_relocation*>(
    413                 base() + sec->PointerToRelocations)
    414               + sec->NumberOfRelocations);
    415 
    416   return relocation_iterator(RelocationRef(ret, this));
    417 }
    418 
    419 COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
    420   : ObjectFile(Binary::ID_COFF, Object, ec)
    421   , Header(0)
    422   , SectionTable(0)
    423   , SymbolTable(0)
    424   , StringTable(0)
    425   , StringTableSize(0) {
    426   // Check that we at least have enough room for a header.
    427   if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
    428 
    429   // The actual starting location of the COFF header in the file. This can be
    430   // non-zero in PE/COFF files.
    431   uint64_t HeaderStart = 0;
    432 
    433   // Check if this is a PE/COFF file.
    434   if (base()[0] == 0x4d && base()[1] == 0x5a) {
    435     // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
    436     // PE signature to find 'normal' COFF header.
    437     if (!checkSize(Data, ec, 0x3c + 8)) return;
    438     HeaderStart = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c);
    439     // Check the PE header. ("PE\0\0")
    440     if (std::memcmp(base() + HeaderStart, "PE\0\0", 4) != 0) {
    441       ec = object_error::parse_failed;
    442       return;
    443     }
    444     HeaderStart += 4; // Skip the PE Header.
    445   }
    446 
    447   Header = reinterpret_cast<const coff_file_header *>(base() + HeaderStart);
    448   if (!checkAddr(Data, ec, uintptr_t(Header), sizeof(coff_file_header)))
    449     return;
    450 
    451   SectionTable =
    452     reinterpret_cast<const coff_section *>( base()
    453                                           + HeaderStart
    454                                           + sizeof(coff_file_header)
    455                                           + Header->SizeOfOptionalHeader);
    456   if (!checkAddr(Data, ec, uintptr_t(SectionTable),
    457                  Header->NumberOfSections * sizeof(coff_section)))
    458     return;
    459 
    460   if (Header->PointerToSymbolTable != 0) {
    461     SymbolTable =
    462       reinterpret_cast<const coff_symbol *>(base()
    463                                             + Header->PointerToSymbolTable);
    464     if (!checkAddr(Data, ec, uintptr_t(SymbolTable),
    465                    Header->NumberOfSymbols * sizeof(coff_symbol)))
    466       return;
    467 
    468     // Find string table.
    469     StringTable = reinterpret_cast<const char *>(base())
    470                   + Header->PointerToSymbolTable
    471                   + Header->NumberOfSymbols * sizeof(coff_symbol);
    472     if (!checkAddr(Data, ec, uintptr_t(StringTable), sizeof(ulittle32_t)))
    473       return;
    474 
    475     StringTableSize = *reinterpret_cast<const ulittle32_t *>(StringTable);
    476     if (!checkAddr(Data, ec, uintptr_t(StringTable), StringTableSize))
    477       return;
    478     // Check that the string table is null terminated if has any in it.
    479     if (StringTableSize < 4
    480         || (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)) {
    481       ec = object_error::parse_failed;
    482       return;
    483     }
    484   }
    485 
    486   ec = object_error::success;
    487 }
    488 
    489 symbol_iterator COFFObjectFile::begin_symbols() const {
    490   DataRefImpl ret;
    491   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   ret.p = reinterpret_cast<intptr_t>(StringTable);
    499   return symbol_iterator(SymbolRef(ret, this));
    500 }
    501 
    502 symbol_iterator COFFObjectFile::begin_dynamic_symbols() const {
    503   // TODO: implement
    504   report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
    505 }
    506 
    507 symbol_iterator COFFObjectFile::end_dynamic_symbols() const {
    508   // TODO: implement
    509   report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
    510 }
    511 
    512 library_iterator COFFObjectFile::begin_libraries_needed() const {
    513   // TODO: implement
    514   report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
    515 }
    516 
    517 library_iterator COFFObjectFile::end_libraries_needed() const {
    518   // TODO: implement
    519   report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
    520 }
    521 
    522 StringRef COFFObjectFile::getLoadName() const {
    523   // COFF does not have this field.
    524   return "";
    525 }
    526 
    527 
    528 section_iterator COFFObjectFile::begin_sections() const {
    529   DataRefImpl ret;
    530   ret.p = reinterpret_cast<intptr_t>(SectionTable);
    531   return section_iterator(SectionRef(ret, this));
    532 }
    533 
    534 section_iterator COFFObjectFile::end_sections() const {
    535   DataRefImpl ret;
    536   ret.p = reinterpret_cast<intptr_t>(SectionTable + Header->NumberOfSections);
    537   return section_iterator(SectionRef(ret, this));
    538 }
    539 
    540 uint8_t COFFObjectFile::getBytesInAddress() const {
    541   return getArch() == Triple::x86_64 ? 8 : 4;
    542 }
    543 
    544 StringRef COFFObjectFile::getFileFormatName() const {
    545   switch(Header->Machine) {
    546   case COFF::IMAGE_FILE_MACHINE_I386:
    547     return "COFF-i386";
    548   case COFF::IMAGE_FILE_MACHINE_AMD64:
    549     return "COFF-x86-64";
    550   default:
    551     return "COFF-<unknown arch>";
    552   }
    553 }
    554 
    555 unsigned COFFObjectFile::getArch() const {
    556   switch(Header->Machine) {
    557   case COFF::IMAGE_FILE_MACHINE_I386:
    558     return Triple::x86;
    559   case COFF::IMAGE_FILE_MACHINE_AMD64:
    560     return Triple::x86_64;
    561   default:
    562     return Triple::UnknownArch;
    563   }
    564 }
    565 
    566 error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
    567   Res = Header;
    568   return object_error::success;
    569 }
    570 
    571 error_code COFFObjectFile::getSection(int32_t index,
    572                                       const coff_section *&Result) const {
    573   // Check for special index values.
    574   if (index == COFF::IMAGE_SYM_UNDEFINED ||
    575       index == COFF::IMAGE_SYM_ABSOLUTE ||
    576       index == COFF::IMAGE_SYM_DEBUG)
    577     Result = NULL;
    578   else if (index > 0 && index <= Header->NumberOfSections)
    579     // We already verified the section table data, so no need to check again.
    580     Result = SectionTable + (index - 1);
    581   else
    582     return object_error::parse_failed;
    583   return object_error::success;
    584 }
    585 
    586 error_code COFFObjectFile::getString(uint32_t offset,
    587                                      StringRef &Result) const {
    588   if (StringTableSize <= 4)
    589     // Tried to get a string from an empty string table.
    590     return object_error::parse_failed;
    591   if (offset >= StringTableSize)
    592     return object_error::unexpected_eof;
    593   Result = StringRef(StringTable + offset);
    594   return object_error::success;
    595 }
    596 
    597 error_code COFFObjectFile::getSymbol(uint32_t index,
    598                                      const coff_symbol *&Result) const {
    599   if (index < Header->NumberOfSymbols)
    600     Result = SymbolTable + index;
    601   else
    602     return object_error::parse_failed;
    603   return object_error::success;
    604 }
    605 
    606 error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol,
    607                                          StringRef &Res) const {
    608   // Check for string table entry. First 4 bytes are 0.
    609   if (symbol->Name.Offset.Zeroes == 0) {
    610     uint32_t Offset = symbol->Name.Offset.Offset;
    611     if (error_code ec = getString(Offset, Res))
    612       return ec;
    613     return object_error::success;
    614   }
    615 
    616   if (symbol->Name.ShortName[7] == 0)
    617     // Null terminated, let ::strlen figure out the length.
    618     Res = StringRef(symbol->Name.ShortName);
    619   else
    620     // Not null terminated, use all 8 bytes.
    621     Res = StringRef(symbol->Name.ShortName, 8);
    622   return object_error::success;
    623 }
    624 
    625 error_code COFFObjectFile::getSectionName(const coff_section *Sec,
    626                                           StringRef &Res) const {
    627   StringRef Name;
    628   if (Sec->Name[7] == 0)
    629     // Null terminated, let ::strlen figure out the length.
    630     Name = Sec->Name;
    631   else
    632     // Not null terminated, use all 8 bytes.
    633     Name = StringRef(Sec->Name, 8);
    634 
    635   // Check for string table entry. First byte is '/'.
    636   if (Name[0] == '/') {
    637     uint32_t Offset;
    638     if (Name.substr(1).getAsInteger(10, Offset))
    639       return object_error::parse_failed;
    640     if (error_code ec = getString(Offset, Name))
    641       return ec;
    642   }
    643 
    644   Res = Name;
    645   return object_error::success;
    646 }
    647 
    648 error_code COFFObjectFile::getSectionContents(const coff_section *Sec,
    649                                               ArrayRef<uint8_t> &Res) const {
    650   // The only thing that we need to verify is that the contents is contained
    651   // within the file bounds. We don't need to make sure it doesn't cover other
    652   // data, as there's nothing that says that is not allowed.
    653   uintptr_t ConStart = uintptr_t(base()) + Sec->PointerToRawData;
    654   uintptr_t ConEnd = ConStart + Sec->SizeOfRawData;
    655   if (ConEnd > uintptr_t(Data->getBufferEnd()))
    656     return object_error::parse_failed;
    657   Res = ArrayRef<uint8_t>(reinterpret_cast<const unsigned char*>(ConStart),
    658                           Sec->SizeOfRawData);
    659   return object_error::success;
    660 }
    661 
    662 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
    663   return reinterpret_cast<const coff_relocation*>(Rel.p);
    664 }
    665 error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
    666                                              RelocationRef &Res) const {
    667   Rel.p = reinterpret_cast<uintptr_t>(
    668             reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
    669   Res = RelocationRef(Rel, this);
    670   return object_error::success;
    671 }
    672 error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
    673                                                 uint64_t &Res) const {
    674   Res = toRel(Rel)->VirtualAddress;
    675   return object_error::success;
    676 }
    677 error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel,
    678                                                uint64_t &Res) const {
    679   Res = toRel(Rel)->VirtualAddress;
    680   return object_error::success;
    681 }
    682 error_code COFFObjectFile::getRelocationSymbol(DataRefImpl Rel,
    683                                                SymbolRef &Res) const {
    684   const coff_relocation* R = toRel(Rel);
    685   DataRefImpl Symb;
    686   Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
    687   Res = SymbolRef(Symb, this);
    688   return object_error::success;
    689 }
    690 error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
    691                                              uint64_t &Res) const {
    692   const coff_relocation* R = toRel(Rel);
    693   Res = R->Type;
    694   return object_error::success;
    695 }
    696 
    697 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
    698   case COFF::enum: res = #enum; break;
    699 
    700 error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
    701                                           SmallVectorImpl<char> &Result) const {
    702   const coff_relocation *reloc = toRel(Rel);
    703   StringRef res;
    704   switch (Header->Machine) {
    705   case COFF::IMAGE_FILE_MACHINE_AMD64:
    706     switch (reloc->Type) {
    707     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
    708     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
    709     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
    710     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
    711     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
    712     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
    713     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
    714     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
    715     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
    716     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
    717     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
    718     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
    719     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
    720     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
    721     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
    722     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
    723     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
    724     default:
    725       res = "Unknown";
    726     }
    727     break;
    728   case COFF::IMAGE_FILE_MACHINE_I386:
    729     switch (reloc->Type) {
    730     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
    731     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
    732     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
    733     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
    734     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
    735     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
    736     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
    737     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
    738     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
    739     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
    740     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
    741     default:
    742       res = "Unknown";
    743     }
    744     break;
    745   default:
    746     res = "Unknown";
    747   }
    748   Result.append(res.begin(), res.end());
    749   return object_error::success;
    750 }
    751 
    752 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
    753 
    754 error_code COFFObjectFile::getRelocationAdditionalInfo(DataRefImpl Rel,
    755                                                        int64_t &Res) const {
    756   Res = 0;
    757   return object_error::success;
    758 }
    759 error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
    760                                           SmallVectorImpl<char> &Result) const {
    761   const coff_relocation *reloc = toRel(Rel);
    762   const coff_symbol *symb = 0;
    763   if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
    764   DataRefImpl sym;
    765   sym.p = reinterpret_cast<uintptr_t>(symb);
    766   StringRef symname;
    767   if (error_code ec = getSymbolName(sym, symname)) return ec;
    768   Result.append(symname.begin(), symname.end());
    769   return object_error::success;
    770 }
    771 
    772 error_code COFFObjectFile::getLibraryNext(DataRefImpl LibData,
    773                                           LibraryRef &Result) const {
    774   report_fatal_error("getLibraryNext not implemented in COFFObjectFile");
    775 }
    776 
    777 error_code COFFObjectFile::getLibraryPath(DataRefImpl LibData,
    778                                           StringRef &Result) const {
    779   report_fatal_error("getLibraryPath not implemented in COFFObjectFile");
    780 }
    781 
    782 namespace llvm {
    783 
    784   ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
    785     error_code ec;
    786     return new COFFObjectFile(Object, ec);
    787   }
    788 
    789 } // end namespace llvm
    790