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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 #include "llvm/Support/COFF.h"
     20 #include "llvm/Support/Debug.h"
     21 #include "llvm/Support/raw_ostream.h"
     22 #include <cctype>
     23 #include <limits>
     24 
     25 using namespace llvm;
     26 using namespace object;
     27 
     28 using support::ulittle8_t;
     29 using support::ulittle16_t;
     30 using support::ulittle32_t;
     31 using support::little16_t;
     32 
     33 // Returns false if size is greater than the buffer size. And sets ec.
     34 static bool checkSize(const MemoryBuffer &M, std::error_code &EC,
     35                       uint64_t Size) {
     36   if (M.getBufferSize() < Size) {
     37     EC = object_error::unexpected_eof;
     38     return false;
     39   }
     40   return true;
     41 }
     42 
     43 // Sets Obj unless any bytes in [addr, addr + size) fall outsize of m.
     44 // Returns unexpected_eof if error.
     45 template <typename T>
     46 static std::error_code getObject(const T *&Obj, const MemoryBuffer &M,
     47                                  const uint8_t *Ptr,
     48                                  const size_t Size = sizeof(T)) {
     49   uintptr_t Addr = uintptr_t(Ptr);
     50   if (Addr + Size < Addr || Addr + Size < Size ||
     51       Addr + Size > uintptr_t(M.getBufferEnd())) {
     52     return object_error::unexpected_eof;
     53   }
     54   Obj = reinterpret_cast<const T *>(Addr);
     55   return object_error::success;
     56 }
     57 
     58 // Decode a string table entry in base 64 (//AAAAAA). Expects \arg Str without
     59 // prefixed slashes.
     60 static bool decodeBase64StringEntry(StringRef Str, uint32_t &Result) {
     61   assert(Str.size() <= 6 && "String too long, possible overflow.");
     62   if (Str.size() > 6)
     63     return true;
     64 
     65   uint64_t Value = 0;
     66   while (!Str.empty()) {
     67     unsigned CharVal;
     68     if (Str[0] >= 'A' && Str[0] <= 'Z') // 0..25
     69       CharVal = Str[0] - 'A';
     70     else if (Str[0] >= 'a' && Str[0] <= 'z') // 26..51
     71       CharVal = Str[0] - 'a' + 26;
     72     else if (Str[0] >= '0' && Str[0] <= '9') // 52..61
     73       CharVal = Str[0] - '0' + 52;
     74     else if (Str[0] == '+') // 62
     75       CharVal = 62;
     76     else if (Str[0] == '/') // 63
     77       CharVal = 63;
     78     else
     79       return true;
     80 
     81     Value = (Value * 64) + CharVal;
     82     Str = Str.substr(1);
     83   }
     84 
     85   if (Value > std::numeric_limits<uint32_t>::max())
     86     return true;
     87 
     88   Result = static_cast<uint32_t>(Value);
     89   return false;
     90 }
     91 
     92 const coff_symbol *COFFObjectFile::toSymb(DataRefImpl Ref) const {
     93   const coff_symbol *Addr = reinterpret_cast<const coff_symbol*>(Ref.p);
     94 
     95 # ifndef NDEBUG
     96   // Verify that the symbol points to a valid entry in the symbol table.
     97   uintptr_t Offset = uintptr_t(Addr) - uintptr_t(base());
     98   if (Offset < COFFHeader->PointerToSymbolTable
     99       || Offset >= COFFHeader->PointerToSymbolTable
    100          + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
    101     report_fatal_error("Symbol was outside of symbol table.");
    102 
    103   assert((Offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol)
    104          == 0 && "Symbol did not point to the beginning of a symbol");
    105 # endif
    106 
    107   return Addr;
    108 }
    109 
    110 const coff_section *COFFObjectFile::toSec(DataRefImpl Ref) const {
    111   const coff_section *Addr = reinterpret_cast<const coff_section*>(Ref.p);
    112 
    113 # ifndef NDEBUG
    114   // Verify that the section points to a valid entry in the section table.
    115   if (Addr < SectionTable
    116       || Addr >= (SectionTable + COFFHeader->NumberOfSections))
    117     report_fatal_error("Section was outside of section table.");
    118 
    119   uintptr_t Offset = uintptr_t(Addr) - uintptr_t(SectionTable);
    120   assert(Offset % sizeof(coff_section) == 0 &&
    121          "Section did not point to the beginning of a section");
    122 # endif
    123 
    124   return Addr;
    125 }
    126 
    127 void COFFObjectFile::moveSymbolNext(DataRefImpl &Ref) const {
    128   const coff_symbol *Symb = toSymb(Ref);
    129   Symb += 1 + Symb->NumberOfAuxSymbols;
    130   Ref.p = reinterpret_cast<uintptr_t>(Symb);
    131 }
    132 
    133 std::error_code COFFObjectFile::getSymbolName(DataRefImpl Ref,
    134                                               StringRef &Result) const {
    135   const coff_symbol *Symb = toSymb(Ref);
    136   return getSymbolName(Symb, Result);
    137 }
    138 
    139 std::error_code COFFObjectFile::getSymbolAddress(DataRefImpl Ref,
    140                                                  uint64_t &Result) const {
    141   const coff_symbol *Symb = toSymb(Ref);
    142   const coff_section *Section = nullptr;
    143   if (std::error_code EC = getSection(Symb->SectionNumber, Section))
    144     return EC;
    145 
    146   if (Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
    147     Result = UnknownAddressOrSize;
    148   else if (Section)
    149     Result = Section->VirtualAddress + Symb->Value;
    150   else
    151     Result = Symb->Value;
    152   return object_error::success;
    153 }
    154 
    155 std::error_code COFFObjectFile::getSymbolType(DataRefImpl Ref,
    156                                               SymbolRef::Type &Result) const {
    157   const coff_symbol *Symb = toSymb(Ref);
    158   Result = SymbolRef::ST_Other;
    159   if (Symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
    160       Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
    161     Result = SymbolRef::ST_Unknown;
    162   } else if (Symb->isFunctionDefinition()) {
    163     Result = SymbolRef::ST_Function;
    164   } else {
    165     uint32_t Characteristics = 0;
    166     if (!COFF::isReservedSectionNumber(Symb->SectionNumber)) {
    167       const coff_section *Section = nullptr;
    168       if (std::error_code EC = getSection(Symb->SectionNumber, Section))
    169         return EC;
    170       Characteristics = Section->Characteristics;
    171     }
    172     if (Characteristics & COFF::IMAGE_SCN_MEM_READ &&
    173         ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
    174       Result = SymbolRef::ST_Data;
    175   }
    176   return object_error::success;
    177 }
    178 
    179 uint32_t COFFObjectFile::getSymbolFlags(DataRefImpl Ref) const {
    180   const coff_symbol *Symb = toSymb(Ref);
    181   uint32_t Result = SymbolRef::SF_None;
    182 
    183   // TODO: Correctly set SF_FormatSpecific, SF_Common
    184 
    185   if (Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
    186     if (Symb->Value == 0)
    187       Result |= SymbolRef::SF_Undefined;
    188     else
    189       Result |= SymbolRef::SF_Common;
    190   }
    191 
    192 
    193   // TODO: This are certainly too restrictive.
    194   if (Symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
    195     Result |= SymbolRef::SF_Global;
    196 
    197   if (Symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL)
    198     Result |= SymbolRef::SF_Weak;
    199 
    200   if (Symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE)
    201     Result |= SymbolRef::SF_Absolute;
    202 
    203   return Result;
    204 }
    205 
    206 std::error_code COFFObjectFile::getSymbolSize(DataRefImpl Ref,
    207                                               uint64_t &Result) const {
    208   // FIXME: Return the correct size. This requires looking at all the symbols
    209   //        in the same section as this symbol, and looking for either the next
    210   //        symbol, or the end of the section.
    211   const coff_symbol *Symb = toSymb(Ref);
    212   const coff_section *Section = nullptr;
    213   if (std::error_code EC = getSection(Symb->SectionNumber, Section))
    214     return EC;
    215 
    216   if (Symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
    217     Result = UnknownAddressOrSize;
    218   else if (Section)
    219     Result = Section->SizeOfRawData - Symb->Value;
    220   else
    221     Result = 0;
    222   return object_error::success;
    223 }
    224 
    225 std::error_code
    226 COFFObjectFile::getSymbolSection(DataRefImpl Ref,
    227                                  section_iterator &Result) const {
    228   const coff_symbol *Symb = toSymb(Ref);
    229   if (COFF::isReservedSectionNumber(Symb->SectionNumber)) {
    230     Result = section_end();
    231   } else {
    232     const coff_section *Sec = nullptr;
    233     if (std::error_code EC = getSection(Symb->SectionNumber, Sec))
    234       return EC;
    235     DataRefImpl Ref;
    236     Ref.p = reinterpret_cast<uintptr_t>(Sec);
    237     Result = section_iterator(SectionRef(Ref, this));
    238   }
    239   return object_error::success;
    240 }
    241 
    242 void COFFObjectFile::moveSectionNext(DataRefImpl &Ref) const {
    243   const coff_section *Sec = toSec(Ref);
    244   Sec += 1;
    245   Ref.p = reinterpret_cast<uintptr_t>(Sec);
    246 }
    247 
    248 std::error_code COFFObjectFile::getSectionName(DataRefImpl Ref,
    249                                                StringRef &Result) const {
    250   const coff_section *Sec = toSec(Ref);
    251   return getSectionName(Sec, Result);
    252 }
    253 
    254 std::error_code COFFObjectFile::getSectionAddress(DataRefImpl Ref,
    255                                                   uint64_t &Result) const {
    256   const coff_section *Sec = toSec(Ref);
    257   Result = Sec->VirtualAddress;
    258   return object_error::success;
    259 }
    260 
    261 std::error_code COFFObjectFile::getSectionSize(DataRefImpl Ref,
    262                                                uint64_t &Result) const {
    263   const coff_section *Sec = toSec(Ref);
    264   Result = Sec->SizeOfRawData;
    265   return object_error::success;
    266 }
    267 
    268 std::error_code COFFObjectFile::getSectionContents(DataRefImpl Ref,
    269                                                    StringRef &Result) const {
    270   const coff_section *Sec = toSec(Ref);
    271   ArrayRef<uint8_t> Res;
    272   std::error_code EC = getSectionContents(Sec, Res);
    273   Result = StringRef(reinterpret_cast<const char*>(Res.data()), Res.size());
    274   return EC;
    275 }
    276 
    277 std::error_code COFFObjectFile::getSectionAlignment(DataRefImpl Ref,
    278                                                     uint64_t &Res) const {
    279   const coff_section *Sec = toSec(Ref);
    280   if (!Sec)
    281     return object_error::parse_failed;
    282   Res = uint64_t(1) << (((Sec->Characteristics & 0x00F00000) >> 20) - 1);
    283   return object_error::success;
    284 }
    285 
    286 std::error_code COFFObjectFile::isSectionText(DataRefImpl Ref,
    287                                               bool &Result) const {
    288   const coff_section *Sec = toSec(Ref);
    289   Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
    290   return object_error::success;
    291 }
    292 
    293 std::error_code COFFObjectFile::isSectionData(DataRefImpl Ref,
    294                                               bool &Result) const {
    295   const coff_section *Sec = toSec(Ref);
    296   Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
    297   return object_error::success;
    298 }
    299 
    300 std::error_code COFFObjectFile::isSectionBSS(DataRefImpl Ref,
    301                                              bool &Result) const {
    302   const coff_section *Sec = toSec(Ref);
    303   Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
    304   return object_error::success;
    305 }
    306 
    307 std::error_code
    308 COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Ref,
    309                                               bool &Result) const {
    310   // FIXME: Unimplemented
    311   Result = true;
    312   return object_error::success;
    313 }
    314 
    315 std::error_code COFFObjectFile::isSectionVirtual(DataRefImpl Ref,
    316                                                  bool &Result) const {
    317   const coff_section *Sec = toSec(Ref);
    318   Result = Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
    319   return object_error::success;
    320 }
    321 
    322 std::error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Ref,
    323                                                   bool &Result) const {
    324   // FIXME: Unimplemented.
    325   Result = false;
    326   return object_error::success;
    327 }
    328 
    329 std::error_code COFFObjectFile::isSectionReadOnlyData(DataRefImpl Ref,
    330                                                       bool &Result) const {
    331   // FIXME: Unimplemented.
    332   Result = false;
    333   return object_error::success;
    334 }
    335 
    336 std::error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl SecRef,
    337                                                       DataRefImpl SymbRef,
    338                                                       bool &Result) const {
    339   const coff_section *Sec = toSec(SecRef);
    340   const coff_symbol *Symb = toSymb(SymbRef);
    341   const coff_section *SymbSec = nullptr;
    342   if (std::error_code EC = getSection(Symb->SectionNumber, SymbSec))
    343     return EC;
    344   if (SymbSec == Sec)
    345     Result = true;
    346   else
    347     Result = false;
    348   return object_error::success;
    349 }
    350 
    351 relocation_iterator COFFObjectFile::section_rel_begin(DataRefImpl Ref) const {
    352   const coff_section *Sec = toSec(Ref);
    353   DataRefImpl Ret;
    354   if (Sec->NumberOfRelocations == 0) {
    355     Ret.p = 0;
    356   } else {
    357     auto begin = reinterpret_cast<const coff_relocation*>(
    358         base() + Sec->PointerToRelocations);
    359     if (Sec->hasExtendedRelocations()) {
    360       // Skip the first relocation entry repurposed to store the number of
    361       // relocations.
    362       begin++;
    363     }
    364     Ret.p = reinterpret_cast<uintptr_t>(begin);
    365   }
    366   return relocation_iterator(RelocationRef(Ret, this));
    367 }
    368 
    369 static uint32_t getNumberOfRelocations(const coff_section *Sec,
    370                                        const uint8_t *base) {
    371   // The field for the number of relocations in COFF section table is only
    372   // 16-bit wide. If a section has more than 65535 relocations, 0xFFFF is set to
    373   // NumberOfRelocations field, and the actual relocation count is stored in the
    374   // VirtualAddress field in the first relocation entry.
    375   if (Sec->hasExtendedRelocations()) {
    376     auto *FirstReloc = reinterpret_cast<const coff_relocation*>(
    377         base + Sec->PointerToRelocations);
    378     return FirstReloc->VirtualAddress;
    379   }
    380   return Sec->NumberOfRelocations;
    381 }
    382 
    383 relocation_iterator COFFObjectFile::section_rel_end(DataRefImpl Ref) const {
    384   const coff_section *Sec = toSec(Ref);
    385   DataRefImpl Ret;
    386   if (Sec->NumberOfRelocations == 0) {
    387     Ret.p = 0;
    388   } else {
    389     auto begin = reinterpret_cast<const coff_relocation*>(
    390         base() + Sec->PointerToRelocations);
    391     uint32_t NumReloc = getNumberOfRelocations(Sec, base());
    392     Ret.p = reinterpret_cast<uintptr_t>(begin + NumReloc);
    393   }
    394   return relocation_iterator(RelocationRef(Ret, this));
    395 }
    396 
    397 // Initialize the pointer to the symbol table.
    398 std::error_code COFFObjectFile::initSymbolTablePtr() {
    399   if (std::error_code EC = getObject(
    400           SymbolTable, *Data, base() + COFFHeader->PointerToSymbolTable,
    401           COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
    402     return EC;
    403 
    404   // Find string table. The first four byte of the string table contains the
    405   // total size of the string table, including the size field itself. If the
    406   // string table is empty, the value of the first four byte would be 4.
    407   const uint8_t *StringTableAddr =
    408       base() + COFFHeader->PointerToSymbolTable +
    409       COFFHeader->NumberOfSymbols * sizeof(coff_symbol);
    410   const ulittle32_t *StringTableSizePtr;
    411   if (std::error_code EC =
    412           getObject(StringTableSizePtr, *Data, StringTableAddr))
    413     return EC;
    414   StringTableSize = *StringTableSizePtr;
    415   if (std::error_code EC =
    416           getObject(StringTable, *Data, StringTableAddr, StringTableSize))
    417     return EC;
    418 
    419   // Treat table sizes < 4 as empty because contrary to the PECOFF spec, some
    420   // tools like cvtres write a size of 0 for an empty table instead of 4.
    421   if (StringTableSize < 4)
    422       StringTableSize = 4;
    423 
    424   // Check that the string table is null terminated if has any in it.
    425   if (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)
    426     return  object_error::parse_failed;
    427   return object_error::success;
    428 }
    429 
    430 // Returns the file offset for the given VA.
    431 std::error_code COFFObjectFile::getVaPtr(uint64_t Addr, uintptr_t &Res) const {
    432   uint64_t ImageBase = PE32Header ? (uint64_t)PE32Header->ImageBase
    433                                   : (uint64_t)PE32PlusHeader->ImageBase;
    434   uint64_t Rva = Addr - ImageBase;
    435   assert(Rva <= UINT32_MAX);
    436   return getRvaPtr((uint32_t)Rva, Res);
    437 }
    438 
    439 // Returns the file offset for the given RVA.
    440 std::error_code COFFObjectFile::getRvaPtr(uint32_t Addr, uintptr_t &Res) const {
    441   for (const SectionRef &S : sections()) {
    442     const coff_section *Section = getCOFFSection(S);
    443     uint32_t SectionStart = Section->VirtualAddress;
    444     uint32_t SectionEnd = Section->VirtualAddress + Section->VirtualSize;
    445     if (SectionStart <= Addr && Addr < SectionEnd) {
    446       uint32_t Offset = Addr - SectionStart;
    447       Res = uintptr_t(base()) + Section->PointerToRawData + Offset;
    448       return object_error::success;
    449     }
    450   }
    451   return object_error::parse_failed;
    452 }
    453 
    454 // Returns hint and name fields, assuming \p Rva is pointing to a Hint/Name
    455 // table entry.
    456 std::error_code COFFObjectFile::getHintName(uint32_t Rva, uint16_t &Hint,
    457                                             StringRef &Name) const {
    458   uintptr_t IntPtr = 0;
    459   if (std::error_code EC = getRvaPtr(Rva, IntPtr))
    460     return EC;
    461   const uint8_t *Ptr = reinterpret_cast<const uint8_t *>(IntPtr);
    462   Hint = *reinterpret_cast<const ulittle16_t *>(Ptr);
    463   Name = StringRef(reinterpret_cast<const char *>(Ptr + 2));
    464   return object_error::success;
    465 }
    466 
    467 // Find the import table.
    468 std::error_code COFFObjectFile::initImportTablePtr() {
    469   // First, we get the RVA of the import table. If the file lacks a pointer to
    470   // the import table, do nothing.
    471   const data_directory *DataEntry;
    472   if (getDataDirectory(COFF::IMPORT_TABLE, DataEntry))
    473     return object_error::success;
    474 
    475   // Do nothing if the pointer to import table is NULL.
    476   if (DataEntry->RelativeVirtualAddress == 0)
    477     return object_error::success;
    478 
    479   uint32_t ImportTableRva = DataEntry->RelativeVirtualAddress;
    480   NumberOfImportDirectory = DataEntry->Size /
    481       sizeof(import_directory_table_entry);
    482 
    483   // Find the section that contains the RVA. This is needed because the RVA is
    484   // the import table's memory address which is different from its file offset.
    485   uintptr_t IntPtr = 0;
    486   if (std::error_code EC = getRvaPtr(ImportTableRva, IntPtr))
    487     return EC;
    488   ImportDirectory = reinterpret_cast<
    489       const import_directory_table_entry *>(IntPtr);
    490   return object_error::success;
    491 }
    492 
    493 // Find the export table.
    494 std::error_code COFFObjectFile::initExportTablePtr() {
    495   // First, we get the RVA of the export table. If the file lacks a pointer to
    496   // the export table, do nothing.
    497   const data_directory *DataEntry;
    498   if (getDataDirectory(COFF::EXPORT_TABLE, DataEntry))
    499     return object_error::success;
    500 
    501   // Do nothing if the pointer to export table is NULL.
    502   if (DataEntry->RelativeVirtualAddress == 0)
    503     return object_error::success;
    504 
    505   uint32_t ExportTableRva = DataEntry->RelativeVirtualAddress;
    506   uintptr_t IntPtr = 0;
    507   if (std::error_code EC = getRvaPtr(ExportTableRva, IntPtr))
    508     return EC;
    509   ExportDirectory =
    510       reinterpret_cast<const export_directory_table_entry *>(IntPtr);
    511   return object_error::success;
    512 }
    513 
    514 COFFObjectFile::COFFObjectFile(std::unique_ptr<MemoryBuffer> Object,
    515                                std::error_code &EC)
    516     : ObjectFile(Binary::ID_COFF, std::move(Object)), COFFHeader(nullptr),
    517       PE32Header(nullptr), PE32PlusHeader(nullptr), DataDirectory(nullptr),
    518       SectionTable(nullptr), SymbolTable(nullptr), StringTable(nullptr),
    519       StringTableSize(0), ImportDirectory(nullptr), NumberOfImportDirectory(0),
    520       ExportDirectory(nullptr) {
    521   // Check that we at least have enough room for a header.
    522   if (!checkSize(*Data, EC, sizeof(coff_file_header)))
    523     return;
    524 
    525   // The current location in the file where we are looking at.
    526   uint64_t CurPtr = 0;
    527 
    528   // PE header is optional and is present only in executables. If it exists,
    529   // it is placed right after COFF header.
    530   bool HasPEHeader = false;
    531 
    532   // Check if this is a PE/COFF file.
    533   if (base()[0] == 0x4d && base()[1] == 0x5a) {
    534     // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
    535     // PE signature to find 'normal' COFF header.
    536     if (!checkSize(*Data, EC, 0x3c + 8))
    537       return;
    538     CurPtr = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c);
    539     // Check the PE magic bytes. ("PE\0\0")
    540     if (std::memcmp(base() + CurPtr, "PE\0\0", 4) != 0) {
    541       EC = object_error::parse_failed;
    542       return;
    543     }
    544     CurPtr += 4; // Skip the PE magic bytes.
    545     HasPEHeader = true;
    546   }
    547 
    548   if ((EC = getObject(COFFHeader, *Data, base() + CurPtr)))
    549     return;
    550   CurPtr += sizeof(coff_file_header);
    551 
    552   if (HasPEHeader) {
    553     const pe32_header *Header;
    554     if ((EC = getObject(Header, *Data, base() + CurPtr)))
    555       return;
    556 
    557     const uint8_t *DataDirAddr;
    558     uint64_t DataDirSize;
    559     if (Header->Magic == 0x10b) {
    560       PE32Header = Header;
    561       DataDirAddr = base() + CurPtr + sizeof(pe32_header);
    562       DataDirSize = sizeof(data_directory) * PE32Header->NumberOfRvaAndSize;
    563     } else if (Header->Magic == 0x20b) {
    564       PE32PlusHeader = reinterpret_cast<const pe32plus_header *>(Header);
    565       DataDirAddr = base() + CurPtr + sizeof(pe32plus_header);
    566       DataDirSize = sizeof(data_directory) * PE32PlusHeader->NumberOfRvaAndSize;
    567     } else {
    568       // It's neither PE32 nor PE32+.
    569       EC = object_error::parse_failed;
    570       return;
    571     }
    572     if ((EC = getObject(DataDirectory, *Data, DataDirAddr, DataDirSize)))
    573       return;
    574     CurPtr += COFFHeader->SizeOfOptionalHeader;
    575   }
    576 
    577   if (COFFHeader->isImportLibrary())
    578     return;
    579 
    580   if ((EC = getObject(SectionTable, *Data, base() + CurPtr,
    581                       COFFHeader->NumberOfSections * sizeof(coff_section))))
    582     return;
    583 
    584   // Initialize the pointer to the symbol table.
    585   if (COFFHeader->PointerToSymbolTable != 0)
    586     if ((EC = initSymbolTablePtr()))
    587       return;
    588 
    589   // Initialize the pointer to the beginning of the import table.
    590   if ((EC = initImportTablePtr()))
    591     return;
    592 
    593   // Initialize the pointer to the export table.
    594   if ((EC = initExportTablePtr()))
    595     return;
    596 
    597   EC = object_error::success;
    598 }
    599 
    600 basic_symbol_iterator COFFObjectFile::symbol_begin_impl() const {
    601   DataRefImpl Ret;
    602   Ret.p = reinterpret_cast<uintptr_t>(SymbolTable);
    603   return basic_symbol_iterator(SymbolRef(Ret, this));
    604 }
    605 
    606 basic_symbol_iterator COFFObjectFile::symbol_end_impl() const {
    607   // The symbol table ends where the string table begins.
    608   DataRefImpl Ret;
    609   Ret.p = reinterpret_cast<uintptr_t>(StringTable);
    610   return basic_symbol_iterator(SymbolRef(Ret, this));
    611 }
    612 
    613 library_iterator COFFObjectFile::needed_library_begin() const {
    614   // TODO: implement
    615   report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
    616 }
    617 
    618 library_iterator COFFObjectFile::needed_library_end() const {
    619   // TODO: implement
    620   report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
    621 }
    622 
    623 StringRef COFFObjectFile::getLoadName() const {
    624   // COFF does not have this field.
    625   return "";
    626 }
    627 
    628 import_directory_iterator COFFObjectFile::import_directory_begin() const {
    629   return import_directory_iterator(
    630       ImportDirectoryEntryRef(ImportDirectory, 0, this));
    631 }
    632 
    633 import_directory_iterator COFFObjectFile::import_directory_end() const {
    634   return import_directory_iterator(
    635       ImportDirectoryEntryRef(ImportDirectory, NumberOfImportDirectory, this));
    636 }
    637 
    638 export_directory_iterator COFFObjectFile::export_directory_begin() const {
    639   return export_directory_iterator(
    640       ExportDirectoryEntryRef(ExportDirectory, 0, this));
    641 }
    642 
    643 export_directory_iterator COFFObjectFile::export_directory_end() const {
    644   if (!ExportDirectory)
    645     return export_directory_iterator(ExportDirectoryEntryRef(nullptr, 0, this));
    646   ExportDirectoryEntryRef Ref(ExportDirectory,
    647                               ExportDirectory->AddressTableEntries, this);
    648   return export_directory_iterator(Ref);
    649 }
    650 
    651 section_iterator COFFObjectFile::section_begin() const {
    652   DataRefImpl Ret;
    653   Ret.p = reinterpret_cast<uintptr_t>(SectionTable);
    654   return section_iterator(SectionRef(Ret, this));
    655 }
    656 
    657 section_iterator COFFObjectFile::section_end() const {
    658   DataRefImpl Ret;
    659   int NumSections = COFFHeader->isImportLibrary()
    660       ? 0 : COFFHeader->NumberOfSections;
    661   Ret.p = reinterpret_cast<uintptr_t>(SectionTable + NumSections);
    662   return section_iterator(SectionRef(Ret, this));
    663 }
    664 
    665 uint8_t COFFObjectFile::getBytesInAddress() const {
    666   return getArch() == Triple::x86_64 ? 8 : 4;
    667 }
    668 
    669 StringRef COFFObjectFile::getFileFormatName() const {
    670   switch(COFFHeader->Machine) {
    671   case COFF::IMAGE_FILE_MACHINE_I386:
    672     return "COFF-i386";
    673   case COFF::IMAGE_FILE_MACHINE_AMD64:
    674     return "COFF-x86-64";
    675   case COFF::IMAGE_FILE_MACHINE_ARMNT:
    676     return "COFF-ARM";
    677   default:
    678     return "COFF-<unknown arch>";
    679   }
    680 }
    681 
    682 unsigned COFFObjectFile::getArch() const {
    683   switch(COFFHeader->Machine) {
    684   case COFF::IMAGE_FILE_MACHINE_I386:
    685     return Triple::x86;
    686   case COFF::IMAGE_FILE_MACHINE_AMD64:
    687     return Triple::x86_64;
    688   case COFF::IMAGE_FILE_MACHINE_ARMNT:
    689     return Triple::thumb;
    690   default:
    691     return Triple::UnknownArch;
    692   }
    693 }
    694 
    695 // This method is kept here because lld uses this. As soon as we make
    696 // lld to use getCOFFHeader, this method will be removed.
    697 std::error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
    698   return getCOFFHeader(Res);
    699 }
    700 
    701 std::error_code
    702 COFFObjectFile::getCOFFHeader(const coff_file_header *&Res) const {
    703   Res = COFFHeader;
    704   return object_error::success;
    705 }
    706 
    707 std::error_code COFFObjectFile::getPE32Header(const pe32_header *&Res) const {
    708   Res = PE32Header;
    709   return object_error::success;
    710 }
    711 
    712 std::error_code
    713 COFFObjectFile::getPE32PlusHeader(const pe32plus_header *&Res) const {
    714   Res = PE32PlusHeader;
    715   return object_error::success;
    716 }
    717 
    718 std::error_code
    719 COFFObjectFile::getDataDirectory(uint32_t Index,
    720                                  const data_directory *&Res) const {
    721   // Error if if there's no data directory or the index is out of range.
    722   if (!DataDirectory)
    723     return object_error::parse_failed;
    724   assert(PE32Header || PE32PlusHeader);
    725   uint32_t NumEnt = PE32Header ? PE32Header->NumberOfRvaAndSize
    726                                : PE32PlusHeader->NumberOfRvaAndSize;
    727   if (Index > NumEnt)
    728     return object_error::parse_failed;
    729   Res = &DataDirectory[Index];
    730   return object_error::success;
    731 }
    732 
    733 std::error_code COFFObjectFile::getSection(int32_t Index,
    734                                            const coff_section *&Result) const {
    735   // Check for special index values.
    736   if (COFF::isReservedSectionNumber(Index))
    737     Result = nullptr;
    738   else if (Index > 0 && Index <= COFFHeader->NumberOfSections)
    739     // We already verified the section table data, so no need to check again.
    740     Result = SectionTable + (Index - 1);
    741   else
    742     return object_error::parse_failed;
    743   return object_error::success;
    744 }
    745 
    746 std::error_code COFFObjectFile::getString(uint32_t Offset,
    747                                           StringRef &Result) const {
    748   if (StringTableSize <= 4)
    749     // Tried to get a string from an empty string table.
    750     return object_error::parse_failed;
    751   if (Offset >= StringTableSize)
    752     return object_error::unexpected_eof;
    753   Result = StringRef(StringTable + Offset);
    754   return object_error::success;
    755 }
    756 
    757 std::error_code COFFObjectFile::getSymbol(uint32_t Index,
    758                                           const coff_symbol *&Result) const {
    759   if (Index < COFFHeader->NumberOfSymbols)
    760     Result = SymbolTable + Index;
    761   else
    762     return object_error::parse_failed;
    763   return object_error::success;
    764 }
    765 
    766 std::error_code COFFObjectFile::getSymbolName(const coff_symbol *Symbol,
    767                                               StringRef &Res) const {
    768   // Check for string table entry. First 4 bytes are 0.
    769   if (Symbol->Name.Offset.Zeroes == 0) {
    770     uint32_t Offset = Symbol->Name.Offset.Offset;
    771     if (std::error_code EC = getString(Offset, Res))
    772       return EC;
    773     return object_error::success;
    774   }
    775 
    776   if (Symbol->Name.ShortName[7] == 0)
    777     // Null terminated, let ::strlen figure out the length.
    778     Res = StringRef(Symbol->Name.ShortName);
    779   else
    780     // Not null terminated, use all 8 bytes.
    781     Res = StringRef(Symbol->Name.ShortName, 8);
    782   return object_error::success;
    783 }
    784 
    785 ArrayRef<uint8_t> COFFObjectFile::getSymbolAuxData(
    786                                   const coff_symbol *Symbol) const {
    787   const uint8_t *Aux = nullptr;
    788 
    789   if (Symbol->NumberOfAuxSymbols > 0) {
    790   // AUX data comes immediately after the symbol in COFF
    791     Aux = reinterpret_cast<const uint8_t *>(Symbol + 1);
    792 # ifndef NDEBUG
    793     // Verify that the Aux symbol points to a valid entry in the symbol table.
    794     uintptr_t Offset = uintptr_t(Aux) - uintptr_t(base());
    795     if (Offset < COFFHeader->PointerToSymbolTable
    796         || Offset >= COFFHeader->PointerToSymbolTable
    797            + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
    798       report_fatal_error("Aux Symbol data was outside of symbol table.");
    799 
    800     assert((Offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol)
    801          == 0 && "Aux Symbol data did not point to the beginning of a symbol");
    802 # endif
    803   }
    804   return ArrayRef<uint8_t>(Aux,
    805                            Symbol->NumberOfAuxSymbols * sizeof(coff_symbol));
    806 }
    807 
    808 std::error_code COFFObjectFile::getSectionName(const coff_section *Sec,
    809                                                StringRef &Res) const {
    810   StringRef Name;
    811   if (Sec->Name[7] == 0)
    812     // Null terminated, let ::strlen figure out the length.
    813     Name = Sec->Name;
    814   else
    815     // Not null terminated, use all 8 bytes.
    816     Name = StringRef(Sec->Name, 8);
    817 
    818   // Check for string table entry. First byte is '/'.
    819   if (Name[0] == '/') {
    820     uint32_t Offset;
    821     if (Name[1] == '/') {
    822       if (decodeBase64StringEntry(Name.substr(2), Offset))
    823         return object_error::parse_failed;
    824     } else {
    825       if (Name.substr(1).getAsInteger(10, Offset))
    826         return object_error::parse_failed;
    827     }
    828     if (std::error_code EC = getString(Offset, Name))
    829       return EC;
    830   }
    831 
    832   Res = Name;
    833   return object_error::success;
    834 }
    835 
    836 std::error_code
    837 COFFObjectFile::getSectionContents(const coff_section *Sec,
    838                                    ArrayRef<uint8_t> &Res) const {
    839   // The only thing that we need to verify is that the contents is contained
    840   // within the file bounds. We don't need to make sure it doesn't cover other
    841   // data, as there's nothing that says that is not allowed.
    842   uintptr_t ConStart = uintptr_t(base()) + Sec->PointerToRawData;
    843   uintptr_t ConEnd = ConStart + Sec->SizeOfRawData;
    844   if (ConEnd > uintptr_t(Data->getBufferEnd()))
    845     return object_error::parse_failed;
    846   Res = ArrayRef<uint8_t>(reinterpret_cast<const unsigned char*>(ConStart),
    847                           Sec->SizeOfRawData);
    848   return object_error::success;
    849 }
    850 
    851 const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
    852   return reinterpret_cast<const coff_relocation*>(Rel.p);
    853 }
    854 
    855 void COFFObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
    856   Rel.p = reinterpret_cast<uintptr_t>(
    857             reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
    858 }
    859 
    860 std::error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
    861                                                      uint64_t &Res) const {
    862   report_fatal_error("getRelocationAddress not implemented in COFFObjectFile");
    863 }
    864 
    865 std::error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel,
    866                                                     uint64_t &Res) const {
    867   Res = toRel(Rel)->VirtualAddress;
    868   return object_error::success;
    869 }
    870 
    871 symbol_iterator COFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
    872   const coff_relocation* R = toRel(Rel);
    873   DataRefImpl Ref;
    874   Ref.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
    875   return symbol_iterator(SymbolRef(Ref, this));
    876 }
    877 
    878 std::error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
    879                                                   uint64_t &Res) const {
    880   const coff_relocation* R = toRel(Rel);
    881   Res = R->Type;
    882   return object_error::success;
    883 }
    884 
    885 const coff_section *
    886 COFFObjectFile::getCOFFSection(const SectionRef &Section) const {
    887   return toSec(Section.getRawDataRefImpl());
    888 }
    889 
    890 const coff_symbol *
    891 COFFObjectFile::getCOFFSymbol(const SymbolRef &Symbol) const {
    892   return toSymb(Symbol.getRawDataRefImpl());
    893 }
    894 
    895 const coff_relocation *
    896 COFFObjectFile::getCOFFRelocation(const RelocationRef &Reloc) const {
    897   return toRel(Reloc.getRawDataRefImpl());
    898 }
    899 
    900 #define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(reloc_type)                           \
    901   case COFF::reloc_type:                                                       \
    902     Res = #reloc_type;                                                         \
    903     break;
    904 
    905 std::error_code
    906 COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
    907                                       SmallVectorImpl<char> &Result) const {
    908   const coff_relocation *Reloc = toRel(Rel);
    909   StringRef Res;
    910   switch (COFFHeader->Machine) {
    911   case COFF::IMAGE_FILE_MACHINE_AMD64:
    912     switch (Reloc->Type) {
    913     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
    914     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
    915     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
    916     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
    917     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
    918     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
    919     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
    920     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
    921     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
    922     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
    923     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
    924     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
    925     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
    926     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
    927     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
    928     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
    929     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
    930     default:
    931       Res = "Unknown";
    932     }
    933     break;
    934   case COFF::IMAGE_FILE_MACHINE_ARMNT:
    935     switch (Reloc->Type) {
    936     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_ABSOLUTE);
    937     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_ADDR32);
    938     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_ADDR32NB);
    939     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BRANCH24);
    940     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BRANCH11);
    941     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_TOKEN);
    942     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BLX24);
    943     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BLX11);
    944     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_SECTION);
    945     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_SECREL);
    946     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_MOV32A);
    947     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_MOV32T);
    948     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BRANCH20T);
    949     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BRANCH24T);
    950     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BLX23T);
    951     default:
    952       Res = "Unknown";
    953     }
    954     break;
    955   case COFF::IMAGE_FILE_MACHINE_I386:
    956     switch (Reloc->Type) {
    957     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
    958     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
    959     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
    960     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
    961     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
    962     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
    963     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
    964     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
    965     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
    966     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
    967     LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
    968     default:
    969       Res = "Unknown";
    970     }
    971     break;
    972   default:
    973     Res = "Unknown";
    974   }
    975   Result.append(Res.begin(), Res.end());
    976   return object_error::success;
    977 }
    978 
    979 #undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
    980 
    981 std::error_code
    982 COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
    983                                          SmallVectorImpl<char> &Result) const {
    984   const coff_relocation *Reloc = toRel(Rel);
    985   const coff_symbol *Symb = nullptr;
    986   if (std::error_code EC = getSymbol(Reloc->SymbolTableIndex, Symb))
    987     return EC;
    988   DataRefImpl Sym;
    989   Sym.p = reinterpret_cast<uintptr_t>(Symb);
    990   StringRef SymName;
    991   if (std::error_code EC = getSymbolName(Sym, SymName))
    992     return EC;
    993   Result.append(SymName.begin(), SymName.end());
    994   return object_error::success;
    995 }
    996 
    997 std::error_code COFFObjectFile::getLibraryNext(DataRefImpl LibData,
    998                                                LibraryRef &Result) const {
    999   report_fatal_error("getLibraryNext not implemented in COFFObjectFile");
   1000 }
   1001 
   1002 std::error_code COFFObjectFile::getLibraryPath(DataRefImpl LibData,
   1003                                                StringRef &Result) const {
   1004   report_fatal_error("getLibraryPath not implemented in COFFObjectFile");
   1005 }
   1006 
   1007 bool ImportDirectoryEntryRef::
   1008 operator==(const ImportDirectoryEntryRef &Other) const {
   1009   return ImportTable == Other.ImportTable && Index == Other.Index;
   1010 }
   1011 
   1012 void ImportDirectoryEntryRef::moveNext() {
   1013   ++Index;
   1014 }
   1015 
   1016 std::error_code ImportDirectoryEntryRef::getImportTableEntry(
   1017     const import_directory_table_entry *&Result) const {
   1018   Result = ImportTable;
   1019   return object_error::success;
   1020 }
   1021 
   1022 std::error_code ImportDirectoryEntryRef::getName(StringRef &Result) const {
   1023   uintptr_t IntPtr = 0;
   1024   if (std::error_code EC =
   1025           OwningObject->getRvaPtr(ImportTable->NameRVA, IntPtr))
   1026     return EC;
   1027   Result = StringRef(reinterpret_cast<const char *>(IntPtr));
   1028   return object_error::success;
   1029 }
   1030 
   1031 std::error_code ImportDirectoryEntryRef::getImportLookupEntry(
   1032     const import_lookup_table_entry32 *&Result) const {
   1033   uintptr_t IntPtr = 0;
   1034   if (std::error_code EC =
   1035           OwningObject->getRvaPtr(ImportTable->ImportLookupTableRVA, IntPtr))
   1036     return EC;
   1037   Result = reinterpret_cast<const import_lookup_table_entry32 *>(IntPtr);
   1038   return object_error::success;
   1039 }
   1040 
   1041 bool ExportDirectoryEntryRef::
   1042 operator==(const ExportDirectoryEntryRef &Other) const {
   1043   return ExportTable == Other.ExportTable && Index == Other.Index;
   1044 }
   1045 
   1046 void ExportDirectoryEntryRef::moveNext() {
   1047   ++Index;
   1048 }
   1049 
   1050 // Returns the name of the current export symbol. If the symbol is exported only
   1051 // by ordinal, the empty string is set as a result.
   1052 std::error_code ExportDirectoryEntryRef::getDllName(StringRef &Result) const {
   1053   uintptr_t IntPtr = 0;
   1054   if (std::error_code EC =
   1055           OwningObject->getRvaPtr(ExportTable->NameRVA, IntPtr))
   1056     return EC;
   1057   Result = StringRef(reinterpret_cast<const char *>(IntPtr));
   1058   return object_error::success;
   1059 }
   1060 
   1061 // Returns the starting ordinal number.
   1062 std::error_code
   1063 ExportDirectoryEntryRef::getOrdinalBase(uint32_t &Result) const {
   1064   Result = ExportTable->OrdinalBase;
   1065   return object_error::success;
   1066 }
   1067 
   1068 // Returns the export ordinal of the current export symbol.
   1069 std::error_code ExportDirectoryEntryRef::getOrdinal(uint32_t &Result) const {
   1070   Result = ExportTable->OrdinalBase + Index;
   1071   return object_error::success;
   1072 }
   1073 
   1074 // Returns the address of the current export symbol.
   1075 std::error_code ExportDirectoryEntryRef::getExportRVA(uint32_t &Result) const {
   1076   uintptr_t IntPtr = 0;
   1077   if (std::error_code EC =
   1078           OwningObject->getRvaPtr(ExportTable->ExportAddressTableRVA, IntPtr))
   1079     return EC;
   1080   const export_address_table_entry *entry =
   1081       reinterpret_cast<const export_address_table_entry *>(IntPtr);
   1082   Result = entry[Index].ExportRVA;
   1083   return object_error::success;
   1084 }
   1085 
   1086 // Returns the name of the current export symbol. If the symbol is exported only
   1087 // by ordinal, the empty string is set as a result.
   1088 std::error_code
   1089 ExportDirectoryEntryRef::getSymbolName(StringRef &Result) const {
   1090   uintptr_t IntPtr = 0;
   1091   if (std::error_code EC =
   1092           OwningObject->getRvaPtr(ExportTable->OrdinalTableRVA, IntPtr))
   1093     return EC;
   1094   const ulittle16_t *Start = reinterpret_cast<const ulittle16_t *>(IntPtr);
   1095 
   1096   uint32_t NumEntries = ExportTable->NumberOfNamePointers;
   1097   int Offset = 0;
   1098   for (const ulittle16_t *I = Start, *E = Start + NumEntries;
   1099        I < E; ++I, ++Offset) {
   1100     if (*I != Index)
   1101       continue;
   1102     if (std::error_code EC =
   1103             OwningObject->getRvaPtr(ExportTable->NamePointerRVA, IntPtr))
   1104       return EC;
   1105     const ulittle32_t *NamePtr = reinterpret_cast<const ulittle32_t *>(IntPtr);
   1106     if (std::error_code EC = OwningObject->getRvaPtr(NamePtr[Offset], IntPtr))
   1107       return EC;
   1108     Result = StringRef(reinterpret_cast<const char *>(IntPtr));
   1109     return object_error::success;
   1110   }
   1111   Result = "";
   1112   return object_error::success;
   1113 }
   1114 
   1115 ErrorOr<ObjectFile *>
   1116 ObjectFile::createCOFFObjectFile(std::unique_ptr<MemoryBuffer> Object) {
   1117   std::error_code EC;
   1118   std::unique_ptr<COFFObjectFile> Ret(
   1119       new COFFObjectFile(std::move(Object), EC));
   1120   if (EC)
   1121     return EC;
   1122   return Ret.release();
   1123 }
   1124