tools/yaml2obj/yaml2coff.cpp

   1 //===- yaml2coff - Convert YAML to a COFF object file ---------------------===//
   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 /// \file
  11 /// \brief The COFF component of yaml2obj.
  12 ///
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "yaml2obj.h"
  16 #include "llvm/ADT/STLExtras.h"
  17 #include "llvm/ADT/StringExtras.h"
  18 #include "llvm/ADT/StringMap.h"
  19 #include "llvm/ADT/StringSwitch.h"
  20 #include "llvm/Object/COFF.h"
  21 #include "llvm/ObjectYAML/ObjectYAML.h"
  22 #include "llvm/Support/Endian.h"
  23 #include "llvm/Support/MemoryBuffer.h"
  24 #include "llvm/Support/SourceMgr.h"
  25 #include "llvm/Support/raw_ostream.h"
  26 #include <vector>
  27
  28 using namespace llvm;
  29
  30 /// This parses a yaml stream that represents a COFF object file.
  31 /// See docs/yaml2obj for the yaml scheema.
  32 struct COFFParser {
  33   COFFParser(COFFYAML::Object &Obj)
  34       : Obj(Obj), SectionTableStart(0), SectionTableSize(0) {
  35     // A COFF string table always starts with a 4 byte size field. Offsets into
  36     // it include this size, so allocate it now.
  37     StringTable.append(4, char(0));
  38   }
  39
  40   bool useBigObj() const {
  41     return static_cast<int32_t>(Obj.Sections.size()) >
  42            COFF::MaxNumberOfSections16;
  43   }
  44
  45   bool isPE() const { return Obj.OptionalHeader.hasValue(); }
  46   bool is64Bit() const {
  47     return Obj.Header.Machine == COFF::IMAGE_FILE_MACHINE_AMD64;
  48   }
  49
  50   uint32_t getFileAlignment() const {
  51     return Obj.OptionalHeader->Header.FileAlignment;
  52   }
  53
  54   unsigned getHeaderSize() const {
  55     return useBigObj() ? COFF::Header32Size : COFF::Header16Size;
  56   }
  57
  58   unsigned getSymbolSize() const {
  59     return useBigObj() ? COFF::Symbol32Size : COFF::Symbol16Size;
  60   }
  61
  62   bool parseSections() {
  63     for (std::vector<COFFYAML::Section>::iterator i = Obj.Sections.begin(),
  64            e = Obj.Sections.end(); i != e; ++i) {
  65       COFFYAML::Section &Sec = *i;
  66
  67       // If the name is less than 8 bytes, store it in place, otherwise
  68       // store it in the string table.
  69       StringRef Name = Sec.Name;
  70
  71       if (Name.size() <= COFF::NameSize) {
  72         std::copy(Name.begin(), Name.end(), Sec.Header.Name);
  73       } else {
  74         // Add string to the string table and format the index for output.
  75         unsigned Index = getStringIndex(Name);
  76         std::string str = utostr(Index);
  77         if (str.size() > 7) {
  78           errs() << "String table got too large\n";
  79           return false;
  80         }
  81         Sec.Header.Name[0] = '/';
  82         std::copy(str.begin(), str.end(), Sec.Header.Name + 1);
  83       }
  84
  85       if (Sec.Alignment) {
  86         if (Sec.Alignment > 8192) {
  87           errs() << "Section alignment is too large\n";
  88           return false;
  89         }
  90         if (!isPowerOf2_32(Sec.Alignment)) {
  91           errs() << "Section alignment is not a power of 2\n";
  92           return false;
  93         }
  94         Sec.Header.Characteristics |= (Log2_32(Sec.Alignment) + 1) << 20;
  95       }
  96     }
  97     return true;
  98   }
  99
 100   bool parseSymbols() {
 101     for (std::vector<COFFYAML::Symbol>::iterator i = Obj.Symbols.begin(),
 102            e = Obj.Symbols.end(); i != e; ++i) {
 103       COFFYAML::Symbol &Sym = *i;
 104
 105       // If the name is less than 8 bytes, store it in place, otherwise
 106       // store it in the string table.
 107       StringRef Name = Sym.Name;
 108       if (Name.size() <= COFF::NameSize) {
 109         std::copy(Name.begin(), Name.end(), Sym.Header.Name);
 110       } else {
 111         // Add string to the string table and format the index for output.
 112         unsigned Index = getStringIndex(Name);
 113         *reinterpret_cast<support::aligned_ulittle32_t*>(
 114             Sym.Header.Name + 4) = Index;
 115       }
 116
 117       Sym.Header.Type = Sym.SimpleType;
 118       Sym.Header.Type |= Sym.ComplexType << COFF::SCT_COMPLEX_TYPE_SHIFT;
 119     }
 120     return true;
 121   }
 122
 123   bool parse() {
 124     if (!parseSections())
 125       return false;
 126     if (!parseSymbols())
 127       return false;
 128     return true;
 129   }
 130
 131   unsigned getStringIndex(StringRef Str) {
 132     StringMap<unsigned>::iterator i = StringTableMap.find(Str);
 133     if (i == StringTableMap.end()) {
 134       unsigned Index = StringTable.size();
 135       StringTable.append(Str.begin(), Str.end());
 136       StringTable.push_back(0);
 137       StringTableMap[Str] = Index;
 138       return Index;
 139     }
 140     return i->second;
 141   }
 142
 143   COFFYAML::Object &Obj;
 144
 145   StringMap<unsigned> StringTableMap;
 146   std::string StringTable;
 147   uint32_t SectionTableStart;
 148   uint32_t SectionTableSize;
 149 };
 150
 151 // Take a CP and assign addresses and sizes to everything. Returns false if the
 152 // layout is not valid to do.
 153 static bool layoutOptionalHeader(COFFParser &CP) {
 154   if (!CP.isPE())
 155     return true;
 156   unsigned PEHeaderSize = CP.is64Bit() ? sizeof(object::pe32plus_header)
 157                                        : sizeof(object::pe32_header);
 158   CP.Obj.Header.SizeOfOptionalHeader =
 159       PEHeaderSize +
 160       sizeof(object::data_directory) * (COFF::NUM_DATA_DIRECTORIES + 1);
 161   return true;
 162 }
 163
 164 namespace {
 165 enum { DOSStubSize = 128 };
 166 }
 167
 168 // Take a CP and assign addresses and sizes to everything. Returns false if the
 169 // layout is not valid to do.
 170 static bool layoutCOFF(COFFParser &CP) {
 171   // The section table starts immediately after the header, including the
 172   // optional header.
 173   CP.SectionTableStart =
 174       CP.getHeaderSize() + CP.Obj.Header.SizeOfOptionalHeader;
 175   if (CP.isPE())
 176     CP.SectionTableStart += DOSStubSize + sizeof(COFF::PEMagic);
 177   CP.SectionTableSize = COFF::SectionSize * CP.Obj.Sections.size();
 178
 179   uint32_t CurrentSectionDataOffset =
 180       CP.SectionTableStart + CP.SectionTableSize;
 181
 182   // Assign each section data address consecutively.
 183   for (COFFYAML::Section &S : CP.Obj.Sections) {
 184     if (S.SectionData.binary_size() > 0) {
 185       CurrentSectionDataOffset = alignTo(CurrentSectionDataOffset,
 186                                          CP.isPE() ? CP.getFileAlignment() : 4);
 187       S.Header.SizeOfRawData = S.SectionData.binary_size();
 188       if (CP.isPE())
 189         S.Header.SizeOfRawData =
 190             alignTo(S.Header.SizeOfRawData, CP.getFileAlignment());
 191       S.Header.PointerToRawData = CurrentSectionDataOffset;
 192       CurrentSectionDataOffset += S.Header.SizeOfRawData;
 193       if (!S.Relocations.empty()) {
 194         S.Header.PointerToRelocations = CurrentSectionDataOffset;
 195         S.Header.NumberOfRelocations = S.Relocations.size();
 196         CurrentSectionDataOffset +=
 197             S.Header.NumberOfRelocations * COFF::RelocationSize;
 198       }
 199     } else {
 200       S.Header.SizeOfRawData = 0;
 201       S.Header.PointerToRawData = 0;
 202     }
 203   }
 204
 205   uint32_t SymbolTableStart = CurrentSectionDataOffset;
 206
 207   // Calculate number of symbols.
 208   uint32_t NumberOfSymbols = 0;
 209   for (std::vector<COFFYAML::Symbol>::iterator i = CP.Obj.Symbols.begin(),
 210                                                e = CP.Obj.Symbols.end();
 211                                                i != e; ++i) {
 212     uint32_t NumberOfAuxSymbols = 0;
 213     if (i->FunctionDefinition)
 214       NumberOfAuxSymbols += 1;
 215     if (i->bfAndefSymbol)
 216       NumberOfAuxSymbols += 1;
 217     if (i->WeakExternal)
 218       NumberOfAuxSymbols += 1;
 219     if (!i->File.empty())
 220       NumberOfAuxSymbols +=
 221           (i->File.size() + CP.getSymbolSize() - 1) / CP.getSymbolSize();
 222     if (i->SectionDefinition)
 223       NumberOfAuxSymbols += 1;
 224     if (i->CLRToken)
 225       NumberOfAuxSymbols += 1;
 226     i->Header.NumberOfAuxSymbols = NumberOfAuxSymbols;
 227     NumberOfSymbols += 1 + NumberOfAuxSymbols;
 228   }
 229
 230   // Store all the allocated start addresses in the header.
 231   CP.Obj.Header.NumberOfSections = CP.Obj.Sections.size();
 232   CP.Obj.Header.NumberOfSymbols = NumberOfSymbols;
 233   if (NumberOfSymbols > 0 || CP.StringTable.size() > 4)
 234     CP.Obj.Header.PointerToSymbolTable = SymbolTableStart;
 235   else
 236     CP.Obj.Header.PointerToSymbolTable = 0;
 237
 238   *reinterpret_cast<support::ulittle32_t *>(&CP.StringTable[0])
 239     = CP.StringTable.size();
 240
 241   return true;
 242 }
 243
 244 template <typename value_type>
 245 struct binary_le_impl {
 246   value_type Value;
 247   binary_le_impl(value_type V) : Value(V) {}
 248 };
 249
 250 template <typename value_type>
 251 raw_ostream &operator <<( raw_ostream &OS
 252                         , const binary_le_impl<value_type> &BLE) {
 253   char Buffer[sizeof(BLE.Value)];
 254   support::endian::write<value_type, support::little, support::unaligned>(
 255     Buffer, BLE.Value);
 256   OS.write(Buffer, sizeof(BLE.Value));
 257   return OS;
 258 }
 259
 260 template <typename value_type>
 261 binary_le_impl<value_type> binary_le(value_type V) {
 262   return binary_le_impl<value_type>(V);
 263 }
 264
 265 template <size_t NumBytes> struct zeros_impl {};
 266
 267 template <size_t NumBytes>
 268 raw_ostream &operator<<(raw_ostream &OS, const zeros_impl<NumBytes> &) {
 269   char Buffer[NumBytes];
 270   memset(Buffer, 0, sizeof(Buffer));
 271   OS.write(Buffer, sizeof(Buffer));
 272   return OS;
 273 }
 274
 275 template <typename T>
 276 zeros_impl<sizeof(T)> zeros(const T &) {
 277   return zeros_impl<sizeof(T)>();
 278 }
 279
 280 struct num_zeros_impl {
 281   size_t N;
 282   num_zeros_impl(size_t N) : N(N) {}
 283 };
 284
 285 raw_ostream &operator<<(raw_ostream &OS, const num_zeros_impl &NZI) {
 286   for (size_t I = 0; I != NZI.N; ++I)
 287     OS.write(0);
 288   return OS;
 289 }
 290
 291 static num_zeros_impl num_zeros(size_t N) {
 292   num_zeros_impl NZI(N);
 293   return NZI;
 294 }
 295
 296 template <typename T>
 297 static uint32_t initializeOptionalHeader(COFFParser &CP, uint16_t Magic, T Header) {
 298   memset(Header, 0, sizeof(*Header));
 299   Header->Magic = Magic;
 300   Header->SectionAlignment = CP.Obj.OptionalHeader->Header.SectionAlignment;
 301   Header->FileAlignment = CP.Obj.OptionalHeader->Header.FileAlignment;
 302   uint32_t SizeOfCode = 0, SizeOfInitializedData = 0,
 303            SizeOfUninitializedData = 0;
 304   uint32_t SizeOfHeaders = alignTo(CP.SectionTableStart + CP.SectionTableSize,
 305                                    Header->FileAlignment);
 306   uint32_t SizeOfImage = alignTo(SizeOfHeaders, Header->SectionAlignment);
 307   uint32_t BaseOfData = 0;
 308   for (const COFFYAML::Section &S : CP.Obj.Sections) {
 309     if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_CODE)
 310       SizeOfCode += S.Header.SizeOfRawData;
 311     if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
 312       SizeOfInitializedData += S.Header.SizeOfRawData;
 313     if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
 314       SizeOfUninitializedData += S.Header.SizeOfRawData;
 315     if (S.Name.equals(".text"))
 316       Header->BaseOfCode = S.Header.VirtualAddress; // RVA
 317     else if (S.Name.equals(".data"))
 318       BaseOfData = S.Header.VirtualAddress; // RVA
 319     if (S.Header.VirtualAddress)
 320       SizeOfImage += alignTo(S.Header.VirtualSize, Header->SectionAlignment);
 321   }
 322   Header->SizeOfCode = SizeOfCode;
 323   Header->SizeOfInitializedData = SizeOfInitializedData;
 324   Header->SizeOfUninitializedData = SizeOfUninitializedData;
 325   Header->AddressOfEntryPoint =
 326       CP.Obj.OptionalHeader->Header.AddressOfEntryPoint; // RVA
 327   Header->ImageBase = CP.Obj.OptionalHeader->Header.ImageBase;
 328   Header->MajorOperatingSystemVersion =
 329       CP.Obj.OptionalHeader->Header.MajorOperatingSystemVersion;
 330   Header->MinorOperatingSystemVersion =
 331       CP.Obj.OptionalHeader->Header.MinorOperatingSystemVersion;
 332   Header->MajorImageVersion =
 333       CP.Obj.OptionalHeader->Header.MajorImageVersion;
 334   Header->MinorImageVersion =
 335       CP.Obj.OptionalHeader->Header.MinorImageVersion;
 336   Header->MajorSubsystemVersion =
 337       CP.Obj.OptionalHeader->Header.MajorSubsystemVersion;
 338   Header->MinorSubsystemVersion =
 339       CP.Obj.OptionalHeader->Header.MinorSubsystemVersion;
 340   Header->SizeOfImage = SizeOfImage;
 341   Header->SizeOfHeaders = SizeOfHeaders;
 342   Header->Subsystem = CP.Obj.OptionalHeader->Header.Subsystem;
 343   Header->DLLCharacteristics = CP.Obj.OptionalHeader->Header.DLLCharacteristics;
 344   Header->SizeOfStackReserve = CP.Obj.OptionalHeader->Header.SizeOfStackReserve;
 345   Header->SizeOfStackCommit = CP.Obj.OptionalHeader->Header.SizeOfStackCommit;
 346   Header->SizeOfHeapReserve = CP.Obj.OptionalHeader->Header.SizeOfHeapReserve;
 347   Header->SizeOfHeapCommit = CP.Obj.OptionalHeader->Header.SizeOfHeapCommit;
 348   Header->NumberOfRvaAndSize = COFF::NUM_DATA_DIRECTORIES + 1;
 349   return BaseOfData;
 350 }
 351
 352 static bool writeCOFF(COFFParser &CP, raw_ostream &OS) {
 353   if (CP.isPE()) {
 354     // PE files start with a DOS stub.
 355     object::dos_header DH;
 356     memset(&DH, 0, sizeof(DH));
 357
 358     // DOS EXEs start with "MZ" magic.
 359     DH.Magic[0] = 'M';
 360     DH.Magic[1] = 'Z';
 361     // Initializing the AddressOfRelocationTable is strictly optional but
 362     // mollifies certain tools which expect it to have a value greater than
 363     // 0x40.
 364     DH.AddressOfRelocationTable = sizeof(DH);
 365     // This is the address of the PE signature.
 366     DH.AddressOfNewExeHeader = DOSStubSize;
 367
 368     // Write out our DOS stub.
 369     OS.write(reinterpret_cast<char *>(&DH), sizeof(DH));
 370     // Write padding until we reach the position of where our PE signature
 371     // should live.
 372     OS << num_zeros(DOSStubSize - sizeof(DH));
 373     // Write out the PE signature.
 374     OS.write(COFF::PEMagic, sizeof(COFF::PEMagic));
 375   }
 376   if (CP.useBigObj()) {
 377     OS << binary_le(static_cast<uint16_t>(COFF::IMAGE_FILE_MACHINE_UNKNOWN))
 378        << binary_le(static_cast<uint16_t>(0xffff))
 379        << binary_le(static_cast<uint16_t>(COFF::BigObjHeader::MinBigObjectVersion))
 380        << binary_le(CP.Obj.Header.Machine)
 381        << binary_le(CP.Obj.Header.TimeDateStamp);
 382     OS.write(COFF::BigObjMagic, sizeof(COFF::BigObjMagic));
 383     OS << zeros(uint32_t(0))
 384        << zeros(uint32_t(0))
 385        << zeros(uint32_t(0))
 386        << zeros(uint32_t(0))
 387        << binary_le(CP.Obj.Header.NumberOfSections)
 388        << binary_le(CP.Obj.Header.PointerToSymbolTable)
 389        << binary_le(CP.Obj.Header.NumberOfSymbols);
 390   } else {
 391     OS << binary_le(CP.Obj.Header.Machine)
 392        << binary_le(static_cast<int16_t>(CP.Obj.Header.NumberOfSections))
 393        << binary_le(CP.Obj.Header.TimeDateStamp)
 394        << binary_le(CP.Obj.Header.PointerToSymbolTable)
 395        << binary_le(CP.Obj.Header.NumberOfSymbols)
 396        << binary_le(CP.Obj.Header.SizeOfOptionalHeader)
 397        << binary_le(CP.Obj.Header.Characteristics);
 398   }
 399   if (CP.isPE()) {
 400     if (CP.is64Bit()) {
 401       object::pe32plus_header PEH;
 402       initializeOptionalHeader(CP, COFF::PE32Header::PE32_PLUS, &PEH);
 403       OS.write(reinterpret_cast<char *>(&PEH), sizeof(PEH));
 404     } else {
 405       object::pe32_header PEH;
 406       uint32_t BaseOfData = initializeOptionalHeader(CP, COFF::PE32Header::PE32, &PEH);
 407       PEH.BaseOfData = BaseOfData;
 408       OS.write(reinterpret_cast<char *>(&PEH), sizeof(PEH));
 409     }
 410     for (const Optional<COFF::DataDirectory> &DD :
 411          CP.Obj.OptionalHeader->DataDirectories) {
 412       if (!DD.hasValue()) {
 413         OS << zeros(uint32_t(0));
 414         OS << zeros(uint32_t(0));
 415       } else {
 416         OS << binary_le(DD->RelativeVirtualAddress);
 417         OS << binary_le(DD->Size);
 418       }
 419     }
 420     OS << zeros(uint32_t(0));
 421     OS << zeros(uint32_t(0));
 422   }
 423
 424   assert(OS.tell() == CP.SectionTableStart);
 425   // Output section table.
 426   for (std::vector<COFFYAML::Section>::iterator i = CP.Obj.Sections.begin(),
 427                                                 e = CP.Obj.Sections.end();
 428                                                 i != e; ++i) {
 429     OS.write(i->Header.Name, COFF::NameSize);
 430     OS << binary_le(i->Header.VirtualSize)
 431        << binary_le(i->Header.VirtualAddress)
 432        << binary_le(i->Header.SizeOfRawData)
 433        << binary_le(i->Header.PointerToRawData)
 434        << binary_le(i->Header.PointerToRelocations)
 435        << binary_le(i->Header.PointerToLineNumbers)
 436        << binary_le(i->Header.NumberOfRelocations)
 437        << binary_le(i->Header.NumberOfLineNumbers)
 438        << binary_le(i->Header.Characteristics);
 439   }
 440   assert(OS.tell() == CP.SectionTableStart + CP.SectionTableSize);
 441
 442   unsigned CurSymbol = 0;
 443   StringMap<unsigned> SymbolTableIndexMap;
 444   for (std::vector<COFFYAML::Symbol>::iterator I = CP.Obj.Symbols.begin(),
 445                                                E = CP.Obj.Symbols.end();
 446        I != E; ++I) {
 447     SymbolTableIndexMap[I->Name] = CurSymbol;
 448     CurSymbol += 1 + I->Header.NumberOfAuxSymbols;
 449   }
 450
 451   // Output section data.
 452   for (const COFFYAML::Section &S : CP.Obj.Sections) {
 453     if (!S.Header.SizeOfRawData)
 454       continue;
 455     assert(S.Header.PointerToRawData >= OS.tell());
 456     OS << num_zeros(S.Header.PointerToRawData - OS.tell());
 457     S.SectionData.writeAsBinary(OS);
 458     assert(S.Header.SizeOfRawData >= S.SectionData.binary_size());
 459     OS << num_zeros(S.Header.SizeOfRawData - S.SectionData.binary_size());
 460     for (const COFFYAML::Relocation &R : S.Relocations) {
 461       uint32_t SymbolTableIndex = SymbolTableIndexMap[R.SymbolName];
 462       OS << binary_le(R.VirtualAddress)
 463          << binary_le(SymbolTableIndex)
 464          << binary_le(R.Type);
 465     }
 466   }
 467
 468   // Output symbol table.
 469
 470   for (std::vector<COFFYAML::Symbol>::const_iterator i = CP.Obj.Symbols.begin(),
 471                                                      e = CP.Obj.Symbols.end();
 472                                                      i != e; ++i) {
 473     OS.write(i->Header.Name, COFF::NameSize);
 474     OS << binary_le(i->Header.Value);
 475     if (CP.useBigObj())
 476        OS << binary_le(i->Header.SectionNumber);
 477     else
 478        OS << binary_le(static_cast<int16_t>(i->Header.SectionNumber));
 479     OS << binary_le(i->Header.Type)
 480        << binary_le(i->Header.StorageClass)
 481        << binary_le(i->Header.NumberOfAuxSymbols);
 482
 483     if (i->FunctionDefinition)
 484       OS << binary_le(i->FunctionDefinition->TagIndex)
 485          << binary_le(i->FunctionDefinition->TotalSize)
 486          << binary_le(i->FunctionDefinition->PointerToLinenumber)
 487          << binary_le(i->FunctionDefinition->PointerToNextFunction)
 488          << zeros(i->FunctionDefinition->unused)
 489          << num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
 490     if (i->bfAndefSymbol)
 491       OS << zeros(i->bfAndefSymbol->unused1)
 492          << binary_le(i->bfAndefSymbol->Linenumber)
 493          << zeros(i->bfAndefSymbol->unused2)
 494          << binary_le(i->bfAndefSymbol->PointerToNextFunction)
 495          << zeros(i->bfAndefSymbol->unused3)
 496          << num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
 497     if (i->WeakExternal)
 498       OS << binary_le(i->WeakExternal->TagIndex)
 499          << binary_le(i->WeakExternal->Characteristics)
 500          << zeros(i->WeakExternal->unused)
 501          << num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
 502     if (!i->File.empty()) {
 503       unsigned SymbolSize = CP.getSymbolSize();
 504       uint32_t NumberOfAuxRecords =
 505           (i->File.size() + SymbolSize - 1) / SymbolSize;
 506       uint32_t NumberOfAuxBytes = NumberOfAuxRecords * SymbolSize;
 507       uint32_t NumZeros = NumberOfAuxBytes - i->File.size();
 508       OS.write(i->File.data(), i->File.size());
 509       OS << num_zeros(NumZeros);
 510     }
 511     if (i->SectionDefinition)
 512       OS << binary_le(i->SectionDefinition->Length)
 513          << binary_le(i->SectionDefinition->NumberOfRelocations)
 514          << binary_le(i->SectionDefinition->NumberOfLinenumbers)
 515          << binary_le(i->SectionDefinition->CheckSum)
 516          << binary_le(static_cast<int16_t>(i->SectionDefinition->Number))
 517          << binary_le(i->SectionDefinition->Selection)
 518          << zeros(i->SectionDefinition->unused)
 519          << binary_le(static_cast<int16_t>(i->SectionDefinition->Number >> 16))
 520          << num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
 521     if (i->CLRToken)
 522       OS << binary_le(i->CLRToken->AuxType)
 523          << zeros(i->CLRToken->unused1)
 524          << binary_le(i->CLRToken->SymbolTableIndex)
 525          << zeros(i->CLRToken->unused2)
 526          << num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
 527   }
 528
 529   // Output string table.
 530   if (CP.Obj.Header.PointerToSymbolTable)
 531     OS.write(&CP.StringTable[0], CP.StringTable.size());
 532   return true;
 533 }
 534
 535 int yaml2coff(llvm::COFFYAML::Object &Doc, raw_ostream &Out) {
 536   COFFParser CP(Doc);
 537   if (!CP.parse()) {
 538     errs() << "yaml2obj: Failed to parse YAML file!\n";
 539     return 1;
 540   }
 541
 542   if (!layoutOptionalHeader(CP)) {
 543     errs() << "yaml2obj: Failed to layout optional header for COFF file!\n";
 544     return 1;
 545   }
 546   if (!layoutCOFF(CP)) {
 547     errs() << "yaml2obj: Failed to layout COFF file!\n";
 548     return 1;
 549   }
 550   if (!writeCOFF(CP, Out)) {
 551     errs() << "yaml2obj: Failed to write COFF file!\n";
 552     return 1;
 553   }
 554   return 0;
 555 }