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