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 /// 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/DebugInfo/CodeView/DebugStringTableSubsection.h"
  21 #include "llvm/DebugInfo/CodeView/StringsAndChecksums.h"
  22 #include "llvm/Object/COFF.h"
  23 #include "llvm/ObjectYAML/ObjectYAML.h"
  24 #include "llvm/Support/Endian.h"
  25 #include "llvm/Support/MemoryBuffer.h"
  26 #include "llvm/Support/SourceMgr.h"
  27 #include "llvm/Support/raw_ostream.h"
  28 #include <vector>
  29
  30 using namespace llvm;
  31
  32 /// This parses a yaml stream that represents a COFF object file.
  33 /// See docs/yaml2obj for the yaml scheema.
  34 struct COFFParser {
  35   COFFParser(COFFYAML::Object &Obj)
  36       : Obj(Obj), SectionTableStart(0), SectionTableSize(0) {
  37     // A COFF string table always starts with a 4 byte size field. Offsets into
  38     // it include this size, so allocate it now.
  39     StringTable.append(4, char(0));
  40   }
  41
  42   bool useBigObj() const {
  43     return static_cast<int32_t>(Obj.Sections.size()) >
  44            COFF::MaxNumberOfSections16;
  45   }
  46
  47   bool isPE() const { return Obj.OptionalHeader.hasValue(); }
  48   bool is64Bit() const {
  49     return Obj.Header.Machine == COFF::IMAGE_FILE_MACHINE_AMD64;
  50   }
  51
  52   uint32_t getFileAlignment() const {
  53     return Obj.OptionalHeader->Header.FileAlignment;
  54   }
  55
  56   unsigned getHeaderSize() const {
  57     return useBigObj() ? COFF::Header32Size : COFF::Header16Size;
  58   }
  59
  60   unsigned getSymbolSize() const {
  61     return useBigObj() ? COFF::Symbol32Size : COFF::Symbol16Size;
  62   }
  63
  64   bool parseSections() {
  65     for (std::vector<COFFYAML::Section>::iterator i = Obj.Sections.begin(),
  66            e = Obj.Sections.end(); i != e; ++i) {
  67       COFFYAML::Section &Sec = *i;
  68
  69       // If the name is less than 8 bytes, store it in place, otherwise
  70       // store it in the string table.
  71       StringRef Name = Sec.Name;
  72
  73       if (Name.size() <= COFF::NameSize) {
  74         std::copy(Name.begin(), Name.end(), Sec.Header.Name);
  75       } else {
  76         // Add string to the string table and format the index for output.
  77         unsigned Index = getStringIndex(Name);
  78         std::string str = utostr(Index);
  79         if (str.size() > 7) {
  80           errs() << "String table got too large\n";
  81           return false;
  82         }
  83         Sec.Header.Name[0] = '/';
  84         std::copy(str.begin(), str.end(), Sec.Header.Name + 1);
  85       }
  86
  87       if (Sec.Alignment) {
  88         if (Sec.Alignment > 8192) {
  89           errs() << "Section alignment is too large\n";
  90           return false;
  91         }
  92         if (!isPowerOf2_32(Sec.Alignment)) {
  93           errs() << "Section alignment is not a power of 2\n";
  94           return false;
  95         }
  96         Sec.Header.Characteristics |= (Log2_32(Sec.Alignment) + 1) << 20;
  97       }
  98     }
  99     return true;
 100   }
 101
 102   bool parseSymbols() {
 103     for (std::vector<COFFYAML::Symbol>::iterator i = Obj.Symbols.begin(),
 104            e = Obj.Symbols.end(); i != e; ++i) {
 105       COFFYAML::Symbol &Sym = *i;
 106
 107       // If the name is less than 8 bytes, store it in place, otherwise
 108       // store it in the string table.
 109       StringRef Name = Sym.Name;
 110       if (Name.size() <= COFF::NameSize) {
 111         std::copy(Name.begin(), Name.end(), Sym.Header.Name);
 112       } else {
 113         // Add string to the string table and format the index for output.
 114         unsigned Index = getStringIndex(Name);
 115         *reinterpret_cast<support::aligned_ulittle32_t*>(
 116             Sym.Header.Name + 4) = Index;
 117       }
 118
 119       Sym.Header.Type = Sym.SimpleType;
 120       Sym.Header.Type |= Sym.ComplexType << COFF::SCT_COMPLEX_TYPE_SHIFT;
 121     }
 122     return true;
 123   }
 124
 125   bool parse() {
 126     if (!parseSections())
 127       return false;
 128     if (!parseSymbols())
 129       return false;
 130     return true;
 131   }
 132
 133   unsigned getStringIndex(StringRef Str) {
 134     StringMap<unsigned>::iterator i = StringTableMap.find(Str);
 135     if (i == StringTableMap.end()) {
 136       unsigned Index = StringTable.size();
 137       StringTable.append(Str.begin(), Str.end());
 138       StringTable.push_back(0);
 139       StringTableMap[Str] = Index;
 140       return Index;
 141     }
 142     return i->second;
 143   }
 144
 145   COFFYAML::Object &Obj;
 146
 147   codeview::StringsAndChecksums StringsAndChecksums;
 148   BumpPtrAllocator Allocator;
 149   StringMap<unsigned> StringTableMap;
 150   std::string StringTable;
 151   uint32_t SectionTableStart;
 152   uint32_t SectionTableSize;
 153 };
 154
 155 // Take a CP and assign addresses and sizes to everything. Returns false if the
 156 // layout is not valid to do.
 157 static bool layoutOptionalHeader(COFFParser &CP) {
 158   if (!CP.isPE())
 159     return true;
 160   unsigned PEHeaderSize = CP.is64Bit() ? sizeof(object::pe32plus_header)
 161                                        : sizeof(object::pe32_header);
 162   CP.Obj.Header.SizeOfOptionalHeader =
 163       PEHeaderSize +
 164       sizeof(object::data_directory) * (COFF::NUM_DATA_DIRECTORIES + 1);
 165   return true;
 166 }
 167
 168 namespace {
 169 enum { DOSStubSize = 128 };
 170 }
 171
 172 static yaml::BinaryRef
 173 toDebugS(ArrayRef<CodeViewYAML::YAMLDebugSubsection> Subsections,
 174          const codeview::StringsAndChecksums &SC, BumpPtrAllocator &Allocator) {
 175   using namespace codeview;
 176   ExitOnError Err("Error occurred writing .debug$S section");
 177   auto CVSS =
 178       Err(CodeViewYAML::toCodeViewSubsectionList(Allocator, Subsections, SC));
 179
 180   std::vector<DebugSubsectionRecordBuilder> Builders;
 181   uint32_t Size = sizeof(uint32_t);
 182   for (auto &SS : CVSS) {
 183     DebugSubsectionRecordBuilder B(SS, CodeViewContainer::ObjectFile);
 184     Size += B.calculateSerializedLength();
 185     Builders.push_back(std::move(B));
 186   }
 187   uint8_t *Buffer = Allocator.Allocate<uint8_t>(Size);
 188   MutableArrayRef<uint8_t> Output(Buffer, Size);
 189   BinaryStreamWriter Writer(Output, support::little);
 190
 191   Err(Writer.writeInteger<uint32_t>(COFF::DEBUG_SECTION_MAGIC));
 192   for (const auto &B : Builders) {
 193     Err(B.commit(Writer));
 194   }
 195   return {Output};
 196 }
 197
 198 // Take a CP and assign addresses and sizes to everything. Returns false if the
 199 // layout is not valid to do.
 200 static bool layoutCOFF(COFFParser &CP) {
 201   // The section table starts immediately after the header, including the
 202   // optional header.
 203   CP.SectionTableStart =
 204       CP.getHeaderSize() + CP.Obj.Header.SizeOfOptionalHeader;
 205   if (CP.isPE())
 206     CP.SectionTableStart += DOSStubSize + sizeof(COFF::PEMagic);
 207   CP.SectionTableSize = COFF::SectionSize * CP.Obj.Sections.size();
 208
 209   uint32_t CurrentSectionDataOffset =
 210       CP.SectionTableStart + CP.SectionTableSize;
 211
 212   for (COFFYAML::Section &S : CP.Obj.Sections) {
 213     // We support specifying exactly one of SectionData or Subsections.  So if
 214     // there is already some SectionData, then we don't need to do any of this.
 215     if (S.Name == ".debug$S" && S.SectionData.binary_size() == 0) {
 216       CodeViewYAML::initializeStringsAndChecksums(S.DebugS,
 217                                                   CP.StringsAndChecksums);
 218       if (CP.StringsAndChecksums.hasChecksums() &&
 219           CP.StringsAndChecksums.hasStrings())
 220         break;
 221     }
 222   }
 223
 224   // Assign each section data address consecutively.
 225   for (COFFYAML::Section &S : CP.Obj.Sections) {
 226     if (S.Name == ".debug$S") {
 227       if (S.SectionData.binary_size() == 0) {
 228         assert(CP.StringsAndChecksums.hasStrings() &&
 229                "Object file does not have debug string table!");
 230
 231         S.SectionData =
 232             toDebugS(S.DebugS, CP.StringsAndChecksums, CP.Allocator);
 233       }
 234     } else if (S.Name == ".debug$T") {
 235       if (S.SectionData.binary_size() == 0)
 236         S.SectionData = CodeViewYAML::toDebugT(S.DebugT, CP.Allocator, S.Name);
 237     } else if (S.Name == ".debug$P") {
 238       if (S.SectionData.binary_size() == 0)
 239         S.SectionData = CodeViewYAML::toDebugT(S.DebugP, CP.Allocator, S.Name);
 240     } else if (S.Name == ".debug$H") {
 241       if (S.DebugH.hasValue() && S.SectionData.binary_size() == 0)
 242         S.SectionData = CodeViewYAML::toDebugH(*S.DebugH, CP.Allocator);
 243     }
 244
 245     if (S.SectionData.binary_size() > 0) {
 246       CurrentSectionDataOffset = alignTo(CurrentSectionDataOffset,
 247                                          CP.isPE() ? CP.getFileAlignment() : 4);
 248       S.Header.SizeOfRawData = S.SectionData.binary_size();
 249       if (CP.isPE())
 250         S.Header.SizeOfRawData =
 251             alignTo(S.Header.SizeOfRawData, CP.getFileAlignment());
 252       S.Header.PointerToRawData = CurrentSectionDataOffset;
 253       CurrentSectionDataOffset += S.Header.SizeOfRawData;
 254       if (!S.Relocations.empty()) {
 255         S.Header.PointerToRelocations = CurrentSectionDataOffset;
 256         S.Header.NumberOfRelocations = S.Relocations.size();
 257         CurrentSectionDataOffset +=
 258             S.Header.NumberOfRelocations * COFF::RelocationSize;
 259       }
 260     } else {
 261       S.Header.SizeOfRawData = 0;
 262       S.Header.PointerToRawData = 0;
 263     }
 264   }
 265
 266   uint32_t SymbolTableStart = CurrentSectionDataOffset;
 267
 268   // Calculate number of symbols.
 269   uint32_t NumberOfSymbols = 0;
 270   for (std::vector<COFFYAML::Symbol>::iterator i = CP.Obj.Symbols.begin(),
 271                                                e = CP.Obj.Symbols.end();
 272                                                i != e; ++i) {
 273     uint32_t NumberOfAuxSymbols = 0;
 274     if (i->FunctionDefinition)
 275       NumberOfAuxSymbols += 1;
 276     if (i->bfAndefSymbol)
 277       NumberOfAuxSymbols += 1;
 278     if (i->WeakExternal)
 279       NumberOfAuxSymbols += 1;
 280     if (!i->File.empty())
 281       NumberOfAuxSymbols +=
 282           (i->File.size() + CP.getSymbolSize() - 1) / CP.getSymbolSize();
 283     if (i->SectionDefinition)
 284       NumberOfAuxSymbols += 1;
 285     if (i->CLRToken)
 286       NumberOfAuxSymbols += 1;
 287     i->Header.NumberOfAuxSymbols = NumberOfAuxSymbols;
 288     NumberOfSymbols += 1 + NumberOfAuxSymbols;
 289   }
 290
 291   // Store all the allocated start addresses in the header.
 292   CP.Obj.Header.NumberOfSections = CP.Obj.Sections.size();
 293   CP.Obj.Header.NumberOfSymbols = NumberOfSymbols;
 294   if (NumberOfSymbols > 0 || CP.StringTable.size() > 4)
 295     CP.Obj.Header.PointerToSymbolTable = SymbolTableStart;
 296   else
 297     CP.Obj.Header.PointerToSymbolTable = 0;
 298
 299   *reinterpret_cast<support::ulittle32_t *>(&CP.StringTable[0])
 300     = CP.StringTable.size();
 301
 302   return true;
 303 }
 304
 305 template <typename value_type>
 306 struct binary_le_impl {
 307   value_type Value;
 308   binary_le_impl(value_type V) : Value(V) {}
 309 };
 310
 311 template <typename value_type>
 312 raw_ostream &operator <<( raw_ostream &OS
 313                         , const binary_le_impl<value_type> &BLE) {
 314   char Buffer[sizeof(BLE.Value)];
 315   support::endian::write<value_type, support::little, support::unaligned>(
 316     Buffer, BLE.Value);
 317   OS.write(Buffer, sizeof(BLE.Value));
 318   return OS;
 319 }
 320
 321 template <typename value_type>
 322 binary_le_impl<value_type> binary_le(value_type V) {
 323   return binary_le_impl<value_type>(V);
 324 }
 325
 326 template <size_t NumBytes> struct zeros_impl {};
 327
 328 template <size_t NumBytes>
 329 raw_ostream &operator<<(raw_ostream &OS, const zeros_impl<NumBytes> &) {
 330   char Buffer[NumBytes];
 331   memset(Buffer, 0, sizeof(Buffer));
 332   OS.write(Buffer, sizeof(Buffer));
 333   return OS;
 334 }
 335
 336 template <typename T>
 337 zeros_impl<sizeof(T)> zeros(const T &) {
 338   return zeros_impl<sizeof(T)>();
 339 }
 340
 341 struct num_zeros_impl {
 342   size_t N;
 343   num_zeros_impl(size_t N) : N(N) {}
 344 };
 345
 346 raw_ostream &operator<<(raw_ostream &OS, const num_zeros_impl &NZI) {
 347   for (size_t I = 0; I != NZI.N; ++I)
 348     OS.write(0);
 349   return OS;
 350 }
 351
 352 static num_zeros_impl num_zeros(size_t N) {
 353   num_zeros_impl NZI(N);
 354   return NZI;
 355 }
 356
 357 template <typename T>
 358 static uint32_t initializeOptionalHeader(COFFParser &CP, uint16_t Magic, T Header) {
 359   memset(Header, 0, sizeof(*Header));
 360   Header->Magic = Magic;
 361   Header->SectionAlignment = CP.Obj.OptionalHeader->Header.SectionAlignment;
 362   Header->FileAlignment = CP.Obj.OptionalHeader->Header.FileAlignment;
 363   uint32_t SizeOfCode = 0, SizeOfInitializedData = 0,
 364            SizeOfUninitializedData = 0;
 365   uint32_t SizeOfHeaders = alignTo(CP.SectionTableStart + CP.SectionTableSize,
 366                                    Header->FileAlignment);
 367   uint32_t SizeOfImage = alignTo(SizeOfHeaders, Header->SectionAlignment);
 368   uint32_t BaseOfData = 0;
 369   for (const COFFYAML::Section &S : CP.Obj.Sections) {
 370     if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_CODE)
 371       SizeOfCode += S.Header.SizeOfRawData;
 372     if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
 373       SizeOfInitializedData += S.Header.SizeOfRawData;
 374     if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
 375       SizeOfUninitializedData += S.Header.SizeOfRawData;
 376     if (S.Name.equals(".text"))
 377       Header->BaseOfCode = S.Header.VirtualAddress; // RVA
 378     else if (S.Name.equals(".data"))
 379       BaseOfData = S.Header.VirtualAddress; // RVA
 380     if (S.Header.VirtualAddress)
 381       SizeOfImage += alignTo(S.Header.VirtualSize, Header->SectionAlignment);
 382   }
 383   Header->SizeOfCode = SizeOfCode;
 384   Header->SizeOfInitializedData = SizeOfInitializedData;
 385   Header->SizeOfUninitializedData = SizeOfUninitializedData;
 386   Header->AddressOfEntryPoint =
 387       CP.Obj.OptionalHeader->Header.AddressOfEntryPoint; // RVA
 388   Header->ImageBase = CP.Obj.OptionalHeader->Header.ImageBase;
 389   Header->MajorOperatingSystemVersion =
 390       CP.Obj.OptionalHeader->Header.MajorOperatingSystemVersion;
 391   Header->MinorOperatingSystemVersion =
 392       CP.Obj.OptionalHeader->Header.MinorOperatingSystemVersion;
 393   Header->MajorImageVersion =
 394       CP.Obj.OptionalHeader->Header.MajorImageVersion;
 395   Header->MinorImageVersion =
 396       CP.Obj.OptionalHeader->Header.MinorImageVersion;
 397   Header->MajorSubsystemVersion =
 398       CP.Obj.OptionalHeader->Header.MajorSubsystemVersion;
 399   Header->MinorSubsystemVersion =
 400       CP.Obj.OptionalHeader->Header.MinorSubsystemVersion;
 401   Header->SizeOfImage = SizeOfImage;
 402   Header->SizeOfHeaders = SizeOfHeaders;
 403   Header->Subsystem = CP.Obj.OptionalHeader->Header.Subsystem;
 404   Header->DLLCharacteristics = CP.Obj.OptionalHeader->Header.DLLCharacteristics;
 405   Header->SizeOfStackReserve = CP.Obj.OptionalHeader->Header.SizeOfStackReserve;
 406   Header->SizeOfStackCommit = CP.Obj.OptionalHeader->Header.SizeOfStackCommit;
 407   Header->SizeOfHeapReserve = CP.Obj.OptionalHeader->Header.SizeOfHeapReserve;
 408   Header->SizeOfHeapCommit = CP.Obj.OptionalHeader->Header.SizeOfHeapCommit;
 409   Header->NumberOfRvaAndSize = COFF::NUM_DATA_DIRECTORIES + 1;
 410   return BaseOfData;
 411 }
 412
 413 static bool writeCOFF(COFFParser &CP, raw_ostream &OS) {
 414   if (CP.isPE()) {
 415     // PE files start with a DOS stub.
 416     object::dos_header DH;
 417     memset(&DH, 0, sizeof(DH));
 418
 419     // DOS EXEs start with "MZ" magic.
 420     DH.Magic[0] = 'M';
 421     DH.Magic[1] = 'Z';
 422     // Initializing the AddressOfRelocationTable is strictly optional but
 423     // mollifies certain tools which expect it to have a value greater than
 424     // 0x40.
 425     DH.AddressOfRelocationTable = sizeof(DH);
 426     // This is the address of the PE signature.
 427     DH.AddressOfNewExeHeader = DOSStubSize;
 428
 429     // Write out our DOS stub.
 430     OS.write(reinterpret_cast<char *>(&DH), sizeof(DH));
 431     // Write padding until we reach the position of where our PE signature
 432     // should live.
 433     OS << num_zeros(DOSStubSize - sizeof(DH));
 434     // Write out the PE signature.
 435     OS.write(COFF::PEMagic, sizeof(COFF::PEMagic));
 436   }
 437   if (CP.useBigObj()) {
 438     OS << binary_le(static_cast<uint16_t>(COFF::IMAGE_FILE_MACHINE_UNKNOWN))
 439        << binary_le(static_cast<uint16_t>(0xffff))
 440        << binary_le(static_cast<uint16_t>(COFF::BigObjHeader::MinBigObjectVersion))
 441        << binary_le(CP.Obj.Header.Machine)
 442        << binary_le(CP.Obj.Header.TimeDateStamp);
 443     OS.write(COFF::BigObjMagic, sizeof(COFF::BigObjMagic));
 444     OS << zeros(uint32_t(0))
 445        << zeros(uint32_t(0))
 446        << zeros(uint32_t(0))
 447        << zeros(uint32_t(0))
 448        << binary_le(CP.Obj.Header.NumberOfSections)
 449        << binary_le(CP.Obj.Header.PointerToSymbolTable)
 450        << binary_le(CP.Obj.Header.NumberOfSymbols);
 451   } else {
 452     OS << binary_le(CP.Obj.Header.Machine)
 453        << binary_le(static_cast<int16_t>(CP.Obj.Header.NumberOfSections))
 454        << binary_le(CP.Obj.Header.TimeDateStamp)
 455        << binary_le(CP.Obj.Header.PointerToSymbolTable)
 456        << binary_le(CP.Obj.Header.NumberOfSymbols)
 457        << binary_le(CP.Obj.Header.SizeOfOptionalHeader)
 458        << binary_le(CP.Obj.Header.Characteristics);
 459   }
 460   if (CP.isPE()) {
 461     if (CP.is64Bit()) {
 462       object::pe32plus_header PEH;
 463       initializeOptionalHeader(CP, COFF::PE32Header::PE32_PLUS, &PEH);
 464       OS.write(reinterpret_cast<char *>(&PEH), sizeof(PEH));
 465     } else {
 466       object::pe32_header PEH;
 467       uint32_t BaseOfData = initializeOptionalHeader(CP, COFF::PE32Header::PE32, &PEH);
 468       PEH.BaseOfData = BaseOfData;
 469       OS.write(reinterpret_cast<char *>(&PEH), sizeof(PEH));
 470     }
 471     for (const Optional<COFF::DataDirectory> &DD :
 472          CP.Obj.OptionalHeader->DataDirectories) {
 473       if (!DD.hasValue()) {
 474         OS << zeros(uint32_t(0));
 475         OS << zeros(uint32_t(0));
 476       } else {
 477         OS << binary_le(DD->RelativeVirtualAddress);
 478         OS << binary_le(DD->Size);
 479       }
 480     }
 481     OS << zeros(uint32_t(0));
 482     OS << zeros(uint32_t(0));
 483   }
 484
 485   assert(OS.tell() == CP.SectionTableStart);
 486   // Output section table.
 487   for (std::vector<COFFYAML::Section>::iterator i = CP.Obj.Sections.begin(),
 488                                                 e = CP.Obj.Sections.end();
 489                                                 i != e; ++i) {
 490     OS.write(i->Header.Name, COFF::NameSize);
 491     OS << binary_le(i->Header.VirtualSize)
 492        << binary_le(i->Header.VirtualAddress)
 493        << binary_le(i->Header.SizeOfRawData)
 494        << binary_le(i->Header.PointerToRawData)
 495        << binary_le(i->Header.PointerToRelocations)
 496        << binary_le(i->Header.PointerToLineNumbers)
 497        << binary_le(i->Header.NumberOfRelocations)
 498        << binary_le(i->Header.NumberOfLineNumbers)
 499        << binary_le(i->Header.Characteristics);
 500   }
 501   assert(OS.tell() == CP.SectionTableStart + CP.SectionTableSize);
 502
 503   unsigned CurSymbol = 0;
 504   StringMap<unsigned> SymbolTableIndexMap;
 505   for (std::vector<COFFYAML::Symbol>::iterator I = CP.Obj.Symbols.begin(),
 506                                                E = CP.Obj.Symbols.end();
 507        I != E; ++I) {
 508     SymbolTableIndexMap[I->Name] = CurSymbol;
 509     CurSymbol += 1 + I->Header.NumberOfAuxSymbols;
 510   }
 511
 512   // Output section data.
 513   for (const COFFYAML::Section &S : CP.Obj.Sections) {
 514     if (!S.Header.SizeOfRawData)
 515       continue;
 516     assert(S.Header.PointerToRawData >= OS.tell());
 517     OS << num_zeros(S.Header.PointerToRawData - OS.tell());
 518     S.SectionData.writeAsBinary(OS);
 519     assert(S.Header.SizeOfRawData >= S.SectionData.binary_size());
 520     OS << num_zeros(S.Header.SizeOfRawData - S.SectionData.binary_size());
 521     for (const COFFYAML::Relocation &R : S.Relocations) {
 522       uint32_t SymbolTableIndex = SymbolTableIndexMap[R.SymbolName];
 523       OS << binary_le(R.VirtualAddress)
 524          << binary_le(SymbolTableIndex)
 525          << binary_le(R.Type);
 526     }
 527   }
 528
 529   // Output symbol table.
 530
 531   for (std::vector<COFFYAML::Symbol>::const_iterator i = CP.Obj.Symbols.begin(),
 532                                                      e = CP.Obj.Symbols.end();
 533                                                      i != e; ++i) {
 534     OS.write(i->Header.Name, COFF::NameSize);
 535     OS << binary_le(i->Header.Value);
 536     if (CP.useBigObj())
 537        OS << binary_le(i->Header.SectionNumber);
 538     else
 539        OS << binary_le(static_cast<int16_t>(i->Header.SectionNumber));
 540     OS << binary_le(i->Header.Type)
 541        << binary_le(i->Header.StorageClass)
 542        << binary_le(i->Header.NumberOfAuxSymbols);
 543
 544     if (i->FunctionDefinition)
 545       OS << binary_le(i->FunctionDefinition->TagIndex)
 546          << binary_le(i->FunctionDefinition->TotalSize)
 547          << binary_le(i->FunctionDefinition->PointerToLinenumber)
 548          << binary_le(i->FunctionDefinition->PointerToNextFunction)
 549          << zeros(i->FunctionDefinition->unused)
 550          << num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
 551     if (i->bfAndefSymbol)
 552       OS << zeros(i->bfAndefSymbol->unused1)
 553          << binary_le(i->bfAndefSymbol->Linenumber)
 554          << zeros(i->bfAndefSymbol->unused2)
 555          << binary_le(i->bfAndefSymbol->PointerToNextFunction)
 556          << zeros(i->bfAndefSymbol->unused3)
 557          << num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
 558     if (i->WeakExternal)
 559       OS << binary_le(i->WeakExternal->TagIndex)
 560          << binary_le(i->WeakExternal->Characteristics)
 561          << zeros(i->WeakExternal->unused)
 562          << num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
 563     if (!i->File.empty()) {
 564       unsigned SymbolSize = CP.getSymbolSize();
 565       uint32_t NumberOfAuxRecords =
 566           (i->File.size() + SymbolSize - 1) / SymbolSize;
 567       uint32_t NumberOfAuxBytes = NumberOfAuxRecords * SymbolSize;
 568       uint32_t NumZeros = NumberOfAuxBytes - i->File.size();
 569       OS.write(i->File.data(), i->File.size());
 570       OS << num_zeros(NumZeros);
 571     }
 572     if (i->SectionDefinition)
 573       OS << binary_le(i->SectionDefinition->Length)
 574          << binary_le(i->SectionDefinition->NumberOfRelocations)
 575          << binary_le(i->SectionDefinition->NumberOfLinenumbers)
 576          << binary_le(i->SectionDefinition->CheckSum)
 577          << binary_le(static_cast<int16_t>(i->SectionDefinition->Number))
 578          << binary_le(i->SectionDefinition->Selection)
 579          << zeros(i->SectionDefinition->unused)
 580          << binary_le(static_cast<int16_t>(i->SectionDefinition->Number >> 16))
 581          << num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
 582     if (i->CLRToken)
 583       OS << binary_le(i->CLRToken->AuxType)
 584          << zeros(i->CLRToken->unused1)
 585          << binary_le(i->CLRToken->SymbolTableIndex)
 586          << zeros(i->CLRToken->unused2)
 587          << num_zeros(CP.getSymbolSize() - COFF::Symbol16Size);
 588   }
 589
 590   // Output string table.
 591   if (CP.Obj.Header.PointerToSymbolTable)
 592     OS.write(&CP.StringTable[0], CP.StringTable.size());
 593   return true;
 594 }
 595
 596 int yaml2coff(llvm::COFFYAML::Object &Doc, raw_ostream &Out) {
 597   COFFParser CP(Doc);
 598   if (!CP.parse()) {
 599     errs() << "yaml2obj: Failed to parse YAML file!\n";
 600     return 1;
 601   }
 602
 603   if (!layoutOptionalHeader(CP)) {
 604     errs() << "yaml2obj: Failed to layout optional header for COFF file!\n";
 605     return 1;
 606   }
 607
 608   if (!layoutCOFF(CP)) {
 609     errs() << "yaml2obj: Failed to layout COFF file!\n";
 610     return 1;
 611   }
 612   if (!writeCOFF(CP, Out)) {
 613     errs() << "yaml2obj: Failed to write COFF file!\n";
 614     return 1;
 615   }
 616   return 0;
 617 }