--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/Object/COFFObjectFile.cpp	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,938 @@
+//===- COFFObjectFile.cpp - COFF object file implementation -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the COFFObjectFile class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/COFF.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cctype>
+
+using namespace llvm;
+using namespace object;
+
+namespace {
+using support::ulittle8_t;
+using support::ulittle16_t;
+using support::ulittle32_t;
+using support::little16_t;
+}
+
+namespace {
+// Returns false if size is greater than the buffer size. And sets ec.
+bool checkSize(const MemoryBuffer *m, error_code &ec, uint64_t size) {
+  if (m->getBufferSize() < size) {
+    ec = object_error::unexpected_eof;
+    return false;
+  }
+  return true;
+}
+
+// Sets Obj unless any bytes in [addr, addr + size) fall outsize of m.
+// Returns unexpected_eof if error.
+template<typename T>
+error_code getObject(const T *&Obj, const MemoryBuffer *M, const uint8_t *Ptr,
+                     const size_t Size = sizeof(T)) {
+  uintptr_t Addr = uintptr_t(Ptr);
+  if (Addr + Size < Addr ||
+      Addr + Size < Size ||
+      Addr + Size > uintptr_t(M->getBufferEnd())) {
+    return object_error::unexpected_eof;
+  }
+  Obj = reinterpret_cast<const T *>(Addr);
+  return object_error::success;
+}
+}
+
+const coff_symbol *COFFObjectFile::toSymb(DataRefImpl Symb) const {
+  const coff_symbol *addr = reinterpret_cast<const coff_symbol*>(Symb.p);
+
+# ifndef NDEBUG
+  // Verify that the symbol points to a valid entry in the symbol table.
+  uintptr_t offset = uintptr_t(addr) - uintptr_t(base());
+  if (offset < COFFHeader->PointerToSymbolTable
+      || offset >= COFFHeader->PointerToSymbolTable
+         + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
+    report_fatal_error("Symbol was outside of symbol table.");
+
+  assert((offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol)
+         == 0 && "Symbol did not point to the beginning of a symbol");
+# endif
+
+  return addr;
+}
+
+const coff_section *COFFObjectFile::toSec(DataRefImpl Sec) const {
+  const coff_section *addr = reinterpret_cast<const coff_section*>(Sec.p);
+
+# ifndef NDEBUG
+  // Verify that the section points to a valid entry in the section table.
+  if (addr < SectionTable
+      || addr >= (SectionTable + COFFHeader->NumberOfSections))
+    report_fatal_error("Section was outside of section table.");
+
+  uintptr_t offset = uintptr_t(addr) - uintptr_t(SectionTable);
+  assert(offset % sizeof(coff_section) == 0 &&
+         "Section did not point to the beginning of a section");
+# endif
+
+  return addr;
+}
+
+error_code COFFObjectFile::getSymbolNext(DataRefImpl Symb,
+                                         SymbolRef &Result) const {
+  const coff_symbol *symb = toSymb(Symb);
+  symb += 1 + symb->NumberOfAuxSymbols;
+  Symb.p = reinterpret_cast<uintptr_t>(symb);
+  Result = SymbolRef(Symb, this);
+  return object_error::success;
+}
+
+ error_code COFFObjectFile::getSymbolName(DataRefImpl Symb,
+                                          StringRef &Result) const {
+  const coff_symbol *symb = toSymb(Symb);
+  return getSymbolName(symb, Result);
+}
+
+error_code COFFObjectFile::getSymbolFileOffset(DataRefImpl Symb,
+                                            uint64_t &Result) const {
+  const coff_symbol *symb = toSymb(Symb);
+  const coff_section *Section = NULL;
+  if (error_code ec = getSection(symb->SectionNumber, Section))
+    return ec;
+
+  if (symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
+    Result = UnknownAddressOrSize;
+  else if (Section)
+    Result = Section->PointerToRawData + symb->Value;
+  else
+    Result = symb->Value;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSymbolAddress(DataRefImpl Symb,
+                                            uint64_t &Result) const {
+  const coff_symbol *symb = toSymb(Symb);
+  const coff_section *Section = NULL;
+  if (error_code ec = getSection(symb->SectionNumber, Section))
+    return ec;
+
+  if (symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
+    Result = UnknownAddressOrSize;
+  else if (Section)
+    Result = Section->VirtualAddress + symb->Value;
+  else
+    Result = symb->Value;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSymbolType(DataRefImpl Symb,
+                                         SymbolRef::Type &Result) const {
+  const coff_symbol *symb = toSymb(Symb);
+  Result = SymbolRef::ST_Other;
+  if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
+      symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED) {
+    Result = SymbolRef::ST_Unknown;
+  } else {
+    if (symb->getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION) {
+      Result = SymbolRef::ST_Function;
+    } else {
+      uint32_t Characteristics = 0;
+      if (symb->SectionNumber > 0) {
+        const coff_section *Section = NULL;
+        if (error_code ec = getSection(symb->SectionNumber, Section))
+          return ec;
+        Characteristics = Section->Characteristics;
+      }
+      if (Characteristics & COFF::IMAGE_SCN_MEM_READ &&
+          ~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
+        Result = SymbolRef::ST_Data;
+    }
+  }
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSymbolFlags(DataRefImpl Symb,
+                                          uint32_t &Result) const {
+  const coff_symbol *symb = toSymb(Symb);
+  Result = SymbolRef::SF_None;
+
+  // TODO: Correctly set SF_FormatSpecific, SF_ThreadLocal, SF_Common
+
+  if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
+      symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
+    Result |= SymbolRef::SF_Undefined;
+
+  // TODO: This are certainly too restrictive.
+  if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
+    Result |= SymbolRef::SF_Global;
+
+  if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL)
+    Result |= SymbolRef::SF_Weak;
+
+  if (symb->SectionNumber == COFF::IMAGE_SYM_ABSOLUTE)
+    Result |= SymbolRef::SF_Absolute;
+
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSymbolSize(DataRefImpl Symb,
+                                         uint64_t &Result) const {
+  // FIXME: Return the correct size. This requires looking at all the symbols
+  //        in the same section as this symbol, and looking for either the next
+  //        symbol, or the end of the section.
+  const coff_symbol *symb = toSymb(Symb);
+  const coff_section *Section = NULL;
+  if (error_code ec = getSection(symb->SectionNumber, Section))
+    return ec;
+
+  if (symb->SectionNumber == COFF::IMAGE_SYM_UNDEFINED)
+    Result = UnknownAddressOrSize;
+  else if (Section)
+    Result = Section->SizeOfRawData - symb->Value;
+  else
+    Result = 0;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSymbolSection(DataRefImpl Symb,
+                                            section_iterator &Result) const {
+  const coff_symbol *symb = toSymb(Symb);
+  if (symb->SectionNumber <= COFF::IMAGE_SYM_UNDEFINED)
+    Result = end_sections();
+  else {
+    const coff_section *sec = 0;
+    if (error_code ec = getSection(symb->SectionNumber, sec)) return ec;
+    DataRefImpl Sec;
+    Sec.p = reinterpret_cast<uintptr_t>(sec);
+    Result = section_iterator(SectionRef(Sec, this));
+  }
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSymbolValue(DataRefImpl Symb,
+                                          uint64_t &Val) const {
+  report_fatal_error("getSymbolValue unimplemented in COFFObjectFile");
+}
+
+error_code COFFObjectFile::getSectionNext(DataRefImpl Sec,
+                                          SectionRef &Result) const {
+  const coff_section *sec = toSec(Sec);
+  sec += 1;
+  Sec.p = reinterpret_cast<uintptr_t>(sec);
+  Result = SectionRef(Sec, this);
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSectionName(DataRefImpl Sec,
+                                          StringRef &Result) const {
+  const coff_section *sec = toSec(Sec);
+  return getSectionName(sec, Result);
+}
+
+error_code COFFObjectFile::getSectionAddress(DataRefImpl Sec,
+                                             uint64_t &Result) const {
+  const coff_section *sec = toSec(Sec);
+  Result = sec->VirtualAddress;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSectionSize(DataRefImpl Sec,
+                                          uint64_t &Result) const {
+  const coff_section *sec = toSec(Sec);
+  Result = sec->SizeOfRawData;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSectionContents(DataRefImpl Sec,
+                                              StringRef &Result) const {
+  const coff_section *sec = toSec(Sec);
+  ArrayRef<uint8_t> Res;
+  error_code EC = getSectionContents(sec, Res);
+  Result = StringRef(reinterpret_cast<const char*>(Res.data()), Res.size());
+  return EC;
+}
+
+error_code COFFObjectFile::getSectionAlignment(DataRefImpl Sec,
+                                               uint64_t &Res) const {
+  const coff_section *sec = toSec(Sec);
+  if (!sec)
+    return object_error::parse_failed;
+  Res = uint64_t(1) << (((sec->Characteristics & 0x00F00000) >> 20) - 1);
+  return object_error::success;
+}
+
+error_code COFFObjectFile::isSectionText(DataRefImpl Sec,
+                                         bool &Result) const {
+  const coff_section *sec = toSec(Sec);
+  Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::isSectionData(DataRefImpl Sec,
+                                         bool &Result) const {
+  const coff_section *sec = toSec(Sec);
+  Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::isSectionBSS(DataRefImpl Sec,
+                                        bool &Result) const {
+  const coff_section *sec = toSec(Sec);
+  Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
+                                                         bool &Result) const {
+  // FIXME: Unimplemented
+  Result = true;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::isSectionVirtual(DataRefImpl Sec,
+                                           bool &Result) const {
+  const coff_section *sec = toSec(Sec);
+  Result = sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::isSectionZeroInit(DataRefImpl Sec,
+                                             bool &Result) const {
+  // FIXME: Unimplemented.
+  Result = false;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
+                                                bool &Result) const {
+  // FIXME: Unimplemented.
+  Result = false;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::sectionContainsSymbol(DataRefImpl Sec,
+                                                 DataRefImpl Symb,
+                                                 bool &Result) const {
+  const coff_section *sec = toSec(Sec);
+  const coff_symbol *symb = toSymb(Symb);
+  const coff_section *symb_sec = 0;
+  if (error_code ec = getSection(symb->SectionNumber, symb_sec)) return ec;
+  if (symb_sec == sec)
+    Result = true;
+  else
+    Result = false;
+  return object_error::success;
+}
+
+relocation_iterator COFFObjectFile::section_rel_begin(DataRefImpl Sec) const {
+  const coff_section *sec = toSec(Sec);
+  DataRefImpl ret;
+  if (sec->NumberOfRelocations == 0)
+    ret.p = 0;
+  else
+    ret.p = reinterpret_cast<uintptr_t>(base() + sec->PointerToRelocations);
+
+  return relocation_iterator(RelocationRef(ret, this));
+}
+
+relocation_iterator COFFObjectFile::section_rel_end(DataRefImpl Sec) const {
+  const coff_section *sec = toSec(Sec);
+  DataRefImpl ret;
+  if (sec->NumberOfRelocations == 0)
+    ret.p = 0;
+  else
+    ret.p = reinterpret_cast<uintptr_t>(
+              reinterpret_cast<const coff_relocation*>(
+                base() + sec->PointerToRelocations)
+              + sec->NumberOfRelocations);
+
+  return relocation_iterator(RelocationRef(ret, this));
+}
+
+// Initialize the pointer to the symbol table.
+error_code COFFObjectFile::initSymbolTablePtr() {
+  if (error_code ec = getObject(
+          SymbolTable, Data, base() + COFFHeader->PointerToSymbolTable,
+          COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
+    return ec;
+
+  // Find string table. The first four byte of the string table contains the
+  // total size of the string table, including the size field itself. If the
+  // string table is empty, the value of the first four byte would be 4.
+  const uint8_t *StringTableAddr =
+      base() + COFFHeader->PointerToSymbolTable +
+      COFFHeader->NumberOfSymbols * sizeof(coff_symbol);
+  const ulittle32_t *StringTableSizePtr;
+  if (error_code ec = getObject(StringTableSizePtr, Data, StringTableAddr))
+    return ec;
+  StringTableSize = *StringTableSizePtr;
+  if (error_code ec =
+      getObject(StringTable, Data, StringTableAddr, StringTableSize))
+    return ec;
+
+  // Check that the string table is null terminated if has any in it.
+  if (StringTableSize < 4 ||
+      (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0))
+    return  object_error::parse_failed;
+  return object_error::success;
+}
+
+// Returns the file offset for the given RVA.
+error_code COFFObjectFile::getRvaPtr(uint32_t Rva, uintptr_t &Res) const {
+  error_code ec;
+  for (section_iterator i = begin_sections(), e = end_sections(); i != e;
+       i.increment(ec)) {
+    if (ec)
+      return ec;
+    const coff_section *Section = getCOFFSection(i);
+    uint32_t SectionStart = Section->VirtualAddress;
+    uint32_t SectionEnd = Section->VirtualAddress + Section->VirtualSize;
+    if (SectionStart <= Rva && Rva < SectionEnd) {
+      uint32_t Offset = Rva - SectionStart;
+      Res = uintptr_t(base()) + Section->PointerToRawData + Offset;
+      return object_error::success;
+    }
+  }
+  return object_error::parse_failed;
+}
+
+// Returns hint and name fields, assuming \p Rva is pointing to a Hint/Name
+// table entry.
+error_code COFFObjectFile::
+getHintName(uint32_t Rva, uint16_t &Hint, StringRef &Name) const {
+  uintptr_t IntPtr = 0;
+  if (error_code ec = getRvaPtr(Rva, IntPtr))
+    return ec;
+  const uint8_t *Ptr = reinterpret_cast<const uint8_t *>(IntPtr);
+  Hint = *reinterpret_cast<const ulittle16_t *>(Ptr);
+  Name = StringRef(reinterpret_cast<const char *>(Ptr + 2));
+  return object_error::success;
+}
+
+// Find the import table.
+error_code COFFObjectFile::initImportTablePtr() {
+  // First, we get the RVA of the import table. If the file lacks a pointer to
+  // the import table, do nothing.
+  const data_directory *DataEntry;
+  if (getDataDirectory(COFF::IMPORT_TABLE, DataEntry))
+    return object_error::success;
+
+  // Do nothing if the pointer to import table is NULL.
+  if (DataEntry->RelativeVirtualAddress == 0)
+    return object_error::success;
+
+  uint32_t ImportTableRva = DataEntry->RelativeVirtualAddress;
+  NumberOfImportDirectory = DataEntry->Size /
+      sizeof(import_directory_table_entry);
+
+  // Find the section that contains the RVA. This is needed because the RVA is
+  // the import table's memory address which is different from its file offset.
+  uintptr_t IntPtr = 0;
+  if (error_code ec = getRvaPtr(ImportTableRva, IntPtr))
+    return ec;
+  ImportDirectory = reinterpret_cast<
+      const import_directory_table_entry *>(IntPtr);
+
+  // It's an error if there's no section containing the Import Table RVA.
+  return object_error::parse_failed;
+}
+
+COFFObjectFile::COFFObjectFile(MemoryBuffer *Object, error_code &ec)
+  : ObjectFile(Binary::ID_COFF, Object)
+  , COFFHeader(0)
+  , PE32Header(0)
+  , DataDirectory(0)
+  , SectionTable(0)
+  , SymbolTable(0)
+  , StringTable(0)
+  , StringTableSize(0)
+  , ImportDirectory(0)
+  , NumberOfImportDirectory(0) {
+  // Check that we at least have enough room for a header.
+  if (!checkSize(Data, ec, sizeof(coff_file_header))) return;
+
+  // The current location in the file where we are looking at.
+  uint64_t CurPtr = 0;
+
+  // PE header is optional and is present only in executables. If it exists,
+  // it is placed right after COFF header.
+  bool hasPEHeader = false;
+
+  // Check if this is a PE/COFF file.
+  if (base()[0] == 0x4d && base()[1] == 0x5a) {
+    // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
+    // PE signature to find 'normal' COFF header.
+    if (!checkSize(Data, ec, 0x3c + 8)) return;
+    CurPtr = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c);
+    // Check the PE magic bytes. ("PE\0\0")
+    if (std::memcmp(base() + CurPtr, "PE\0\0", 4) != 0) {
+      ec = object_error::parse_failed;
+      return;
+    }
+    CurPtr += 4; // Skip the PE magic bytes.
+    hasPEHeader = true;
+  }
+
+  if ((ec = getObject(COFFHeader, Data, base() + CurPtr)))
+    return;
+  CurPtr += sizeof(coff_file_header);
+
+  if (hasPEHeader) {
+    if ((ec = getObject(PE32Header, Data, base() + CurPtr)))
+      return;
+    if (PE32Header->Magic != 0x10b) {
+      // We only support PE32. If this is PE32 (not PE32+), the magic byte
+      // should be 0x10b. If this is not PE32, continue as if there's no PE
+      // header in this file.
+      PE32Header = 0;
+    } else if (PE32Header->NumberOfRvaAndSize > 0) {
+      const uint8_t *addr = base() + CurPtr + sizeof(pe32_header);
+      uint64_t size = sizeof(data_directory) * PE32Header->NumberOfRvaAndSize;
+      if ((ec = getObject(DataDirectory, Data, addr, size)))
+        return;
+    }
+    CurPtr += COFFHeader->SizeOfOptionalHeader;
+  }
+
+  if (!COFFHeader->isImportLibrary())
+    if ((ec = getObject(SectionTable, Data, base() + CurPtr,
+                        COFFHeader->NumberOfSections * sizeof(coff_section))))
+      return;
+
+  // Initialize the pointer to the symbol table.
+  if (COFFHeader->PointerToSymbolTable != 0)
+    if ((ec = initSymbolTablePtr()))
+      return;
+
+  // Initialize the pointer to the beginning of the import table.
+  if ((ec = initImportTablePtr()))
+    return;
+
+  ec = object_error::success;
+}
+
+symbol_iterator COFFObjectFile::begin_symbols() const {
+  DataRefImpl ret;
+  ret.p = reinterpret_cast<uintptr_t>(SymbolTable);
+  return symbol_iterator(SymbolRef(ret, this));
+}
+
+symbol_iterator COFFObjectFile::end_symbols() const {
+  // The symbol table ends where the string table begins.
+  DataRefImpl ret;
+  ret.p = reinterpret_cast<uintptr_t>(StringTable);
+  return symbol_iterator(SymbolRef(ret, this));
+}
+
+symbol_iterator COFFObjectFile::begin_dynamic_symbols() const {
+  // TODO: implement
+  report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
+}
+
+symbol_iterator COFFObjectFile::end_dynamic_symbols() const {
+  // TODO: implement
+  report_fatal_error("Dynamic symbols unimplemented in COFFObjectFile");
+}
+
+library_iterator COFFObjectFile::begin_libraries_needed() const {
+  // TODO: implement
+  report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
+}
+
+library_iterator COFFObjectFile::end_libraries_needed() const {
+  // TODO: implement
+  report_fatal_error("Libraries needed unimplemented in COFFObjectFile");
+}
+
+StringRef COFFObjectFile::getLoadName() const {
+  // COFF does not have this field.
+  return "";
+}
+
+import_directory_iterator COFFObjectFile::import_directory_begin() const {
+  DataRefImpl Imp;
+  Imp.p = reinterpret_cast<uintptr_t>(ImportDirectory);
+  return import_directory_iterator(ImportDirectoryEntryRef(Imp, this));
+}
+
+import_directory_iterator COFFObjectFile::import_directory_end() const {
+  DataRefImpl Imp;
+  if (ImportDirectory) {
+    Imp.p = reinterpret_cast<uintptr_t>(
+        ImportDirectory + (NumberOfImportDirectory - 1));
+  } else {
+    Imp.p = 0;
+  }
+  return import_directory_iterator(ImportDirectoryEntryRef(Imp, this));
+}
+
+section_iterator COFFObjectFile::begin_sections() const {
+  DataRefImpl ret;
+  ret.p = reinterpret_cast<uintptr_t>(SectionTable);
+  return section_iterator(SectionRef(ret, this));
+}
+
+section_iterator COFFObjectFile::end_sections() const {
+  DataRefImpl ret;
+  int numSections = COFFHeader->isImportLibrary()
+      ? 0 : COFFHeader->NumberOfSections;
+  ret.p = reinterpret_cast<uintptr_t>(SectionTable + numSections);
+  return section_iterator(SectionRef(ret, this));
+}
+
+uint8_t COFFObjectFile::getBytesInAddress() const {
+  return getArch() == Triple::x86_64 ? 8 : 4;
+}
+
+StringRef COFFObjectFile::getFileFormatName() const {
+  switch(COFFHeader->Machine) {
+  case COFF::IMAGE_FILE_MACHINE_I386:
+    return "COFF-i386";
+  case COFF::IMAGE_FILE_MACHINE_AMD64:
+    return "COFF-x86-64";
+  default:
+    return "COFF-<unknown arch>";
+  }
+}
+
+unsigned COFFObjectFile::getArch() const {
+  switch(COFFHeader->Machine) {
+  case COFF::IMAGE_FILE_MACHINE_I386:
+    return Triple::x86;
+  case COFF::IMAGE_FILE_MACHINE_AMD64:
+    return Triple::x86_64;
+  default:
+    return Triple::UnknownArch;
+  }
+}
+
+// This method is kept here because lld uses this. As soon as we make
+// lld to use getCOFFHeader, this method will be removed.
+error_code COFFObjectFile::getHeader(const coff_file_header *&Res) const {
+  return getCOFFHeader(Res);
+}
+
+error_code COFFObjectFile::getCOFFHeader(const coff_file_header *&Res) const {
+  Res = COFFHeader;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getPE32Header(const pe32_header *&Res) const {
+  Res = PE32Header;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getDataDirectory(uint32_t index,
+                                            const data_directory *&Res) const {
+  // Error if if there's no data directory or the index is out of range.
+  if (!DataDirectory || index > PE32Header->NumberOfRvaAndSize)
+    return object_error::parse_failed;
+  Res = &DataDirectory[index];
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSection(int32_t index,
+                                      const coff_section *&Result) const {
+  // Check for special index values.
+  if (index == COFF::IMAGE_SYM_UNDEFINED ||
+      index == COFF::IMAGE_SYM_ABSOLUTE ||
+      index == COFF::IMAGE_SYM_DEBUG)
+    Result = NULL;
+  else if (index > 0 && index <= COFFHeader->NumberOfSections)
+    // We already verified the section table data, so no need to check again.
+    Result = SectionTable + (index - 1);
+  else
+    return object_error::parse_failed;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getString(uint32_t offset,
+                                     StringRef &Result) const {
+  if (StringTableSize <= 4)
+    // Tried to get a string from an empty string table.
+    return object_error::parse_failed;
+  if (offset >= StringTableSize)
+    return object_error::unexpected_eof;
+  Result = StringRef(StringTable + offset);
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSymbol(uint32_t index,
+                                     const coff_symbol *&Result) const {
+  if (index < COFFHeader->NumberOfSymbols)
+    Result = SymbolTable + index;
+  else
+    return object_error::parse_failed;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSymbolName(const coff_symbol *symbol,
+                                         StringRef &Res) const {
+  // Check for string table entry. First 4 bytes are 0.
+  if (symbol->Name.Offset.Zeroes == 0) {
+    uint32_t Offset = symbol->Name.Offset.Offset;
+    if (error_code ec = getString(Offset, Res))
+      return ec;
+    return object_error::success;
+  }
+
+  if (symbol->Name.ShortName[7] == 0)
+    // Null terminated, let ::strlen figure out the length.
+    Res = StringRef(symbol->Name.ShortName);
+  else
+    // Not null terminated, use all 8 bytes.
+    Res = StringRef(symbol->Name.ShortName, 8);
+  return object_error::success;
+}
+
+ArrayRef<uint8_t> COFFObjectFile::getSymbolAuxData(
+                                  const coff_symbol *symbol) const {
+  const uint8_t *aux = NULL;
+
+  if ( symbol->NumberOfAuxSymbols > 0 ) {
+  // AUX data comes immediately after the symbol in COFF
+    aux = reinterpret_cast<const uint8_t *>(symbol + 1);
+# ifndef NDEBUG
+    // Verify that the aux symbol points to a valid entry in the symbol table.
+    uintptr_t offset = uintptr_t(aux) - uintptr_t(base());
+    if (offset < COFFHeader->PointerToSymbolTable
+        || offset >= COFFHeader->PointerToSymbolTable
+           + (COFFHeader->NumberOfSymbols * sizeof(coff_symbol)))
+      report_fatal_error("Aux Symbol data was outside of symbol table.");
+
+    assert((offset - COFFHeader->PointerToSymbolTable) % sizeof(coff_symbol)
+         == 0 && "Aux Symbol data did not point to the beginning of a symbol");
+# endif
+  }
+  return ArrayRef<uint8_t>(aux, symbol->NumberOfAuxSymbols * sizeof(coff_symbol));
+}
+
+error_code COFFObjectFile::getSectionName(const coff_section *Sec,
+                                          StringRef &Res) const {
+  StringRef Name;
+  if (Sec->Name[7] == 0)
+    // Null terminated, let ::strlen figure out the length.
+    Name = Sec->Name;
+  else
+    // Not null terminated, use all 8 bytes.
+    Name = StringRef(Sec->Name, 8);
+
+  // Check for string table entry. First byte is '/'.
+  if (Name[0] == '/') {
+    uint32_t Offset;
+    if (Name.substr(1).getAsInteger(10, Offset))
+      return object_error::parse_failed;
+    if (error_code ec = getString(Offset, Name))
+      return ec;
+  }
+
+  Res = Name;
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getSectionContents(const coff_section *Sec,
+                                              ArrayRef<uint8_t> &Res) const {
+  // The only thing that we need to verify is that the contents is contained
+  // within the file bounds. We don't need to make sure it doesn't cover other
+  // data, as there's nothing that says that is not allowed.
+  uintptr_t ConStart = uintptr_t(base()) + Sec->PointerToRawData;
+  uintptr_t ConEnd = ConStart + Sec->SizeOfRawData;
+  if (ConEnd > uintptr_t(Data->getBufferEnd()))
+    return object_error::parse_failed;
+  Res = ArrayRef<uint8_t>(reinterpret_cast<const unsigned char*>(ConStart),
+                          Sec->SizeOfRawData);
+  return object_error::success;
+}
+
+const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
+  return reinterpret_cast<const coff_relocation*>(Rel.p);
+}
+error_code COFFObjectFile::getRelocationNext(DataRefImpl Rel,
+                                             RelocationRef &Res) const {
+  Rel.p = reinterpret_cast<uintptr_t>(
+            reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
+  Res = RelocationRef(Rel, this);
+  return object_error::success;
+}
+error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
+                                                uint64_t &Res) const {
+  report_fatal_error("getRelocationAddress not implemented in COFFObjectFile");
+}
+error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel,
+                                               uint64_t &Res) const {
+  Res = toRel(Rel)->VirtualAddress;
+  return object_error::success;
+}
+symbol_iterator COFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
+  const coff_relocation* R = toRel(Rel);
+  DataRefImpl Symb;
+  Symb.p = reinterpret_cast<uintptr_t>(SymbolTable + R->SymbolTableIndex);
+  return symbol_iterator(SymbolRef(Symb, this));
+}
+error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
+                                             uint64_t &Res) const {
+  const coff_relocation* R = toRel(Rel);
+  Res = R->Type;
+  return object_error::success;
+}
+
+const coff_section *COFFObjectFile::getCOFFSection(section_iterator &It) const {
+  return toSec(It->getRawDataRefImpl());
+}
+
+const coff_symbol *COFFObjectFile::getCOFFSymbol(symbol_iterator &It) const {
+  return toSymb(It->getRawDataRefImpl());
+}
+
+const coff_relocation *COFFObjectFile::getCOFFRelocation(
+                                             relocation_iterator &It) const {
+  return toRel(It->getRawDataRefImpl());
+}
+
+#define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(enum) \
+  case COFF::enum: res = #enum; break;
+
+error_code COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
+                                          SmallVectorImpl<char> &Result) const {
+  const coff_relocation *reloc = toRel(Rel);
+  StringRef res;
+  switch (COFFHeader->Machine) {
+  case COFF::IMAGE_FILE_MACHINE_AMD64:
+    switch (reloc->Type) {
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
+    default:
+      res = "Unknown";
+    }
+    break;
+  case COFF::IMAGE_FILE_MACHINE_I386:
+    switch (reloc->Type) {
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
+    LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
+    default:
+      res = "Unknown";
+    }
+    break;
+  default:
+    res = "Unknown";
+  }
+  Result.append(res.begin(), res.end());
+  return object_error::success;
+}
+
+#undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
+
+error_code COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
+                                          SmallVectorImpl<char> &Result) const {
+  const coff_relocation *reloc = toRel(Rel);
+  const coff_symbol *symb = 0;
+  if (error_code ec = getSymbol(reloc->SymbolTableIndex, symb)) return ec;
+  DataRefImpl sym;
+  sym.p = reinterpret_cast<uintptr_t>(symb);
+  StringRef symname;
+  if (error_code ec = getSymbolName(sym, symname)) return ec;
+  Result.append(symname.begin(), symname.end());
+  return object_error::success;
+}
+
+error_code COFFObjectFile::getLibraryNext(DataRefImpl LibData,
+                                          LibraryRef &Result) const {
+  report_fatal_error("getLibraryNext not implemented in COFFObjectFile");
+}
+
+error_code COFFObjectFile::getLibraryPath(DataRefImpl LibData,
+                                          StringRef &Result) const {
+  report_fatal_error("getLibraryPath not implemented in COFFObjectFile");
+}
+
+bool ImportDirectoryEntryRef::
+operator==(const ImportDirectoryEntryRef &Other) const {
+  return ImportDirectoryPimpl == Other.ImportDirectoryPimpl;
+}
+
+static const import_directory_table_entry *toImportEntry(DataRefImpl Imp) {
+  return reinterpret_cast<const import_directory_table_entry *>(Imp.p);
+}
+
+error_code
+ImportDirectoryEntryRef::getNext(ImportDirectoryEntryRef &Result) const {
+  const import_directory_table_entry *Dir = toImportEntry(ImportDirectoryPimpl);
+  Dir += 1;
+  DataRefImpl Next;
+  Next.p = reinterpret_cast<uintptr_t>(Dir);
+  Result = ImportDirectoryEntryRef(Next, OwningObject);
+  return object_error::success;
+}
+
+error_code ImportDirectoryEntryRef::
+getImportTableEntry(const import_directory_table_entry *&Result) const {
+  Result = toImportEntry(ImportDirectoryPimpl);
+  return object_error::success;
+}
+
+error_code ImportDirectoryEntryRef::getName(StringRef &Result) const {
+  const import_directory_table_entry *Dir = toImportEntry(ImportDirectoryPimpl);
+  uintptr_t IntPtr = 0;
+  if (error_code ec = OwningObject->getRvaPtr(Dir->NameRVA, IntPtr))
+    return ec;
+  const char *Ptr = reinterpret_cast<const char *>(IntPtr);
+  Result = StringRef(Ptr);
+  return object_error::success;
+}
+
+error_code ImportDirectoryEntryRef::getImportLookupEntry(
+    const import_lookup_table_entry32 *&Result) const {
+  const import_directory_table_entry *Dir = toImportEntry(ImportDirectoryPimpl);
+  uintptr_t IntPtr = 0;
+  if (error_code ec = OwningObject->getRvaPtr(
+          Dir->ImportLookupTableRVA, IntPtr))
+    return ec;
+  Result = reinterpret_cast<const import_lookup_table_entry32 *>(IntPtr);
+  return object_error::success;
+}
+
+namespace llvm {
+
+  ObjectFile *ObjectFile::createCOFFObjectFile(MemoryBuffer *Object) {
+    error_code ec;
+    return new COFFObjectFile(Object, ec);
+  }
+
+} // end namespace llvm