1 //===- yaml2coff - Convert YAML to a COFF object file ---------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 /// 9 /// \file 10 /// The COFF component of yaml2obj. 11 /// 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ADT/STLExtras.h" 15 #include "llvm/ADT/StringExtras.h" 16 #include "llvm/ADT/StringMap.h" 17 #include "llvm/ADT/StringSwitch.h" 18 #include "llvm/DebugInfo/CodeView/DebugStringTableSubsection.h" 19 #include "llvm/DebugInfo/CodeView/StringsAndChecksums.h" 20 #include "llvm/Object/COFF.h" 21 #include "llvm/ObjectYAML/ObjectYAML.h" 22 #include "llvm/ObjectYAML/yaml2obj.h" 23 #include "llvm/Support/Endian.h" 24 #include "llvm/Support/MemoryBuffer.h" 25 #include "llvm/Support/SourceMgr.h" 26 #include "llvm/Support/WithColor.h" 27 #include "llvm/Support/raw_ostream.h" 28 #include <vector> 29 30 using namespace llvm; 31 32 namespace { 33 34 /// This parses a yaml stream that represents a COFF object file. 35 /// See docs/yaml2obj for the yaml scheema. 36 struct COFFParser { 37 COFFParser(COFFYAML::Object &Obj, yaml::ErrorHandler EH) 38 : Obj(Obj), SectionTableStart(0), SectionTableSize(0), ErrHandler(EH) { 39 // A COFF string table always starts with a 4 byte size field. Offsets into 40 // it include this size, so allocate it now. 41 StringTable.append(4, char(0)); 42 } 43 44 bool useBigObj() const { 45 return static_cast<int32_t>(Obj.Sections.size()) > 46 COFF::MaxNumberOfSections16; 47 } 48 49 bool isPE() const { return Obj.OptionalHeader.hasValue(); } 50 bool is64Bit() const { 51 return Obj.Header.Machine == COFF::IMAGE_FILE_MACHINE_AMD64 || 52 Obj.Header.Machine == COFF::IMAGE_FILE_MACHINE_ARM64; 53 } 54 55 uint32_t getFileAlignment() const { 56 return Obj.OptionalHeader->Header.FileAlignment; 57 } 58 59 unsigned getHeaderSize() const { 60 return useBigObj() ? COFF::Header32Size : COFF::Header16Size; 61 } 62 63 unsigned getSymbolSize() const { 64 return useBigObj() ? COFF::Symbol32Size : COFF::Symbol16Size; 65 } 66 67 bool parseSections() { 68 for (std::vector<COFFYAML::Section>::iterator i = Obj.Sections.begin(), 69 e = Obj.Sections.end(); 70 i != e; ++i) { 71 COFFYAML::Section &Sec = *i; 72 73 // If the name is less than 8 bytes, store it in place, otherwise 74 // store it in the string table. 75 StringRef Name = Sec.Name; 76 77 if (Name.size() <= COFF::NameSize) { 78 std::copy(Name.begin(), Name.end(), Sec.Header.Name); 79 } else { 80 // Add string to the string table and format the index for output. 81 unsigned Index = getStringIndex(Name); 82 std::string str = utostr(Index); 83 if (str.size() > 7) { 84 ErrHandler("string table got too large"); 85 return false; 86 } 87 Sec.Header.Name[0] = '/'; 88 std::copy(str.begin(), str.end(), Sec.Header.Name + 1); 89 } 90 91 if (Sec.Alignment) { 92 if (Sec.Alignment > 8192) { 93 ErrHandler("section alignment is too large"); 94 return false; 95 } 96 if (!isPowerOf2_32(Sec.Alignment)) { 97 ErrHandler("section alignment is not a power of 2"); 98 return false; 99 } 100 Sec.Header.Characteristics |= (Log2_32(Sec.Alignment) + 1) << 20; 101 } 102 } 103 return true; 104 } 105 106 bool parseSymbols() { 107 for (std::vector<COFFYAML::Symbol>::iterator i = Obj.Symbols.begin(), 108 e = Obj.Symbols.end(); 109 i != e; ++i) { 110 COFFYAML::Symbol &Sym = *i; 111 112 // If the name is less than 8 bytes, store it in place, otherwise 113 // store it in the string table. 114 StringRef Name = Sym.Name; 115 if (Name.size() <= COFF::NameSize) { 116 std::copy(Name.begin(), Name.end(), Sym.Header.Name); 117 } else { 118 // Add string to the string table and format the index for output. 119 unsigned Index = getStringIndex(Name); 120 *reinterpret_cast<support::aligned_ulittle32_t *>(Sym.Header.Name + 4) = 121 Index; 122 } 123 124 Sym.Header.Type = Sym.SimpleType; 125 Sym.Header.Type |= Sym.ComplexType << COFF::SCT_COMPLEX_TYPE_SHIFT; 126 } 127 return true; 128 } 129 130 bool parse() { 131 if (!parseSections()) 132 return false; 133 if (!parseSymbols()) 134 return false; 135 return true; 136 } 137 138 unsigned getStringIndex(StringRef Str) { 139 StringMap<unsigned>::iterator i = StringTableMap.find(Str); 140 if (i == StringTableMap.end()) { 141 unsigned Index = StringTable.size(); 142 StringTable.append(Str.begin(), Str.end()); 143 StringTable.push_back(0); 144 StringTableMap[Str] = Index; 145 return Index; 146 } 147 return i->second; 148 } 149 150 COFFYAML::Object &Obj; 151 152 codeview::StringsAndChecksums StringsAndChecksums; 153 BumpPtrAllocator Allocator; 154 StringMap<unsigned> StringTableMap; 155 std::string StringTable; 156 uint32_t SectionTableStart; 157 uint32_t SectionTableSize; 158 159 yaml::ErrorHandler ErrHandler; 160 }; 161 162 enum { DOSStubSize = 128 }; 163 164 } // end anonymous namespace 165 166 // Take a CP and assign addresses and sizes to everything. Returns false if the 167 // layout is not valid to do. 168 static bool layoutOptionalHeader(COFFParser &CP) { 169 if (!CP.isPE()) 170 return true; 171 unsigned PEHeaderSize = CP.is64Bit() ? sizeof(object::pe32plus_header) 172 : sizeof(object::pe32_header); 173 CP.Obj.Header.SizeOfOptionalHeader = 174 PEHeaderSize + 175 sizeof(object::data_directory) * (COFF::NUM_DATA_DIRECTORIES + 1); 176 return true; 177 } 178 179 static yaml::BinaryRef 180 toDebugS(ArrayRef<CodeViewYAML::YAMLDebugSubsection> Subsections, 181 const codeview::StringsAndChecksums &SC, BumpPtrAllocator &Allocator) { 182 using namespace codeview; 183 ExitOnError Err("Error occurred writing .debug$S section"); 184 auto CVSS = 185 Err(CodeViewYAML::toCodeViewSubsectionList(Allocator, Subsections, SC)); 186 187 std::vector<DebugSubsectionRecordBuilder> Builders; 188 uint32_t Size = sizeof(uint32_t); 189 for (auto &SS : CVSS) { 190 DebugSubsectionRecordBuilder B(SS); 191 Size += B.calculateSerializedLength(); 192 Builders.push_back(std::move(B)); 193 } 194 uint8_t *Buffer = Allocator.Allocate<uint8_t>(Size); 195 MutableArrayRef<uint8_t> Output(Buffer, Size); 196 BinaryStreamWriter Writer(Output, support::little); 197 198 Err(Writer.writeInteger<uint32_t>(COFF::DEBUG_SECTION_MAGIC)); 199 for (const auto &B : Builders) { 200 Err(B.commit(Writer, CodeViewContainer::ObjectFile)); 201 } 202 return {Output}; 203 } 204 205 // Take a CP and assign addresses and sizes to everything. Returns false if the 206 // layout is not valid to do. 207 static bool layoutCOFF(COFFParser &CP) { 208 // The section table starts immediately after the header, including the 209 // optional header. 210 CP.SectionTableStart = 211 CP.getHeaderSize() + CP.Obj.Header.SizeOfOptionalHeader; 212 if (CP.isPE()) 213 CP.SectionTableStart += DOSStubSize + sizeof(COFF::PEMagic); 214 CP.SectionTableSize = COFF::SectionSize * CP.Obj.Sections.size(); 215 216 uint32_t CurrentSectionDataOffset = 217 CP.SectionTableStart + CP.SectionTableSize; 218 219 for (COFFYAML::Section &S : CP.Obj.Sections) { 220 // We support specifying exactly one of SectionData or Subsections. So if 221 // there is already some SectionData, then we don't need to do any of this. 222 if (S.Name == ".debug$S" && S.SectionData.binary_size() == 0) { 223 CodeViewYAML::initializeStringsAndChecksums(S.DebugS, 224 CP.StringsAndChecksums); 225 if (CP.StringsAndChecksums.hasChecksums() && 226 CP.StringsAndChecksums.hasStrings()) 227 break; 228 } 229 } 230 231 // Assign each section data address consecutively. 232 for (COFFYAML::Section &S : CP.Obj.Sections) { 233 if (S.Name == ".debug$S") { 234 if (S.SectionData.binary_size() == 0) { 235 assert(CP.StringsAndChecksums.hasStrings() && 236 "Object file does not have debug string table!"); 237 238 S.SectionData = 239 toDebugS(S.DebugS, CP.StringsAndChecksums, CP.Allocator); 240 } 241 } else if (S.Name == ".debug$T") { 242 if (S.SectionData.binary_size() == 0) 243 S.SectionData = CodeViewYAML::toDebugT(S.DebugT, CP.Allocator, S.Name); 244 } else if (S.Name == ".debug$P") { 245 if (S.SectionData.binary_size() == 0) 246 S.SectionData = CodeViewYAML::toDebugT(S.DebugP, CP.Allocator, S.Name); 247 } else if (S.Name == ".debug$H") { 248 if (S.DebugH.hasValue() && S.SectionData.binary_size() == 0) 249 S.SectionData = CodeViewYAML::toDebugH(*S.DebugH, CP.Allocator); 250 } 251 252 if (S.SectionData.binary_size() > 0) { 253 CurrentSectionDataOffset = alignTo(CurrentSectionDataOffset, 254 CP.isPE() ? CP.getFileAlignment() : 4); 255 S.Header.SizeOfRawData = S.SectionData.binary_size(); 256 if (CP.isPE()) 257 S.Header.SizeOfRawData = 258 alignTo(S.Header.SizeOfRawData, CP.getFileAlignment()); 259 S.Header.PointerToRawData = CurrentSectionDataOffset; 260 CurrentSectionDataOffset += S.Header.SizeOfRawData; 261 if (!S.Relocations.empty()) { 262 S.Header.PointerToRelocations = CurrentSectionDataOffset; 263 if (S.Header.Characteristics & COFF::IMAGE_SCN_LNK_NRELOC_OVFL) { 264 S.Header.NumberOfRelocations = 0xffff; 265 CurrentSectionDataOffset += COFF::RelocationSize; 266 } else 267 S.Header.NumberOfRelocations = S.Relocations.size(); 268 CurrentSectionDataOffset += S.Relocations.size() * COFF::RelocationSize; 269 } 270 } else { 271 // Leave SizeOfRawData unaltered. For .bss sections in object files, it 272 // carries the section size. 273 S.Header.PointerToRawData = 0; 274 } 275 } 276 277 uint32_t SymbolTableStart = CurrentSectionDataOffset; 278 279 // Calculate number of symbols. 280 uint32_t NumberOfSymbols = 0; 281 for (std::vector<COFFYAML::Symbol>::iterator i = CP.Obj.Symbols.begin(), 282 e = CP.Obj.Symbols.end(); 283 i != e; ++i) { 284 uint32_t NumberOfAuxSymbols = 0; 285 if (i->FunctionDefinition) 286 NumberOfAuxSymbols += 1; 287 if (i->bfAndefSymbol) 288 NumberOfAuxSymbols += 1; 289 if (i->WeakExternal) 290 NumberOfAuxSymbols += 1; 291 if (!i->File.empty()) 292 NumberOfAuxSymbols += 293 (i->File.size() + CP.getSymbolSize() - 1) / CP.getSymbolSize(); 294 if (i->SectionDefinition) 295 NumberOfAuxSymbols += 1; 296 if (i->CLRToken) 297 NumberOfAuxSymbols += 1; 298 i->Header.NumberOfAuxSymbols = NumberOfAuxSymbols; 299 NumberOfSymbols += 1 + NumberOfAuxSymbols; 300 } 301 302 // Store all the allocated start addresses in the header. 303 CP.Obj.Header.NumberOfSections = CP.Obj.Sections.size(); 304 CP.Obj.Header.NumberOfSymbols = NumberOfSymbols; 305 if (NumberOfSymbols > 0 || CP.StringTable.size() > 4) 306 CP.Obj.Header.PointerToSymbolTable = SymbolTableStart; 307 else 308 CP.Obj.Header.PointerToSymbolTable = 0; 309 310 *reinterpret_cast<support::ulittle32_t *>(&CP.StringTable[0]) = 311 CP.StringTable.size(); 312 313 return true; 314 } 315 316 template <typename value_type> struct binary_le_impl { 317 value_type Value; 318 binary_le_impl(value_type V) : Value(V) {} 319 }; 320 321 template <typename value_type> 322 raw_ostream &operator<<(raw_ostream &OS, 323 const binary_le_impl<value_type> &BLE) { 324 char Buffer[sizeof(BLE.Value)]; 325 support::endian::write<value_type, support::little, support::unaligned>( 326 Buffer, BLE.Value); 327 OS.write(Buffer, sizeof(BLE.Value)); 328 return OS; 329 } 330 331 template <typename value_type> 332 binary_le_impl<value_type> binary_le(value_type V) { 333 return binary_le_impl<value_type>(V); 334 } 335 336 template <size_t NumBytes> struct zeros_impl {}; 337 338 template <size_t NumBytes> 339 raw_ostream &operator<<(raw_ostream &OS, const zeros_impl<NumBytes> &) { 340 char Buffer[NumBytes]; 341 memset(Buffer, 0, sizeof(Buffer)); 342 OS.write(Buffer, sizeof(Buffer)); 343 return OS; 344 } 345 346 template <typename T> zeros_impl<sizeof(T)> zeros(const T &) { 347 return zeros_impl<sizeof(T)>(); 348 } 349 350 template <typename T> 351 static uint32_t initializeOptionalHeader(COFFParser &CP, uint16_t Magic, 352 T Header) { 353 memset(Header, 0, sizeof(*Header)); 354 Header->Magic = Magic; 355 Header->SectionAlignment = CP.Obj.OptionalHeader->Header.SectionAlignment; 356 Header->FileAlignment = CP.Obj.OptionalHeader->Header.FileAlignment; 357 uint32_t SizeOfCode = 0, SizeOfInitializedData = 0, 358 SizeOfUninitializedData = 0; 359 uint32_t SizeOfHeaders = alignTo(CP.SectionTableStart + CP.SectionTableSize, 360 Header->FileAlignment); 361 uint32_t SizeOfImage = alignTo(SizeOfHeaders, Header->SectionAlignment); 362 uint32_t BaseOfData = 0; 363 for (const COFFYAML::Section &S : CP.Obj.Sections) { 364 if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_CODE) 365 SizeOfCode += S.Header.SizeOfRawData; 366 if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA) 367 SizeOfInitializedData += S.Header.SizeOfRawData; 368 if (S.Header.Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) 369 SizeOfUninitializedData += S.Header.SizeOfRawData; 370 if (S.Name.equals(".text")) 371 Header->BaseOfCode = S.Header.VirtualAddress; // RVA 372 else if (S.Name.equals(".data")) 373 BaseOfData = S.Header.VirtualAddress; // RVA 374 if (S.Header.VirtualAddress) 375 SizeOfImage += alignTo(S.Header.VirtualSize, Header->SectionAlignment); 376 } 377 Header->SizeOfCode = SizeOfCode; 378 Header->SizeOfInitializedData = SizeOfInitializedData; 379 Header->SizeOfUninitializedData = SizeOfUninitializedData; 380 Header->AddressOfEntryPoint = 381 CP.Obj.OptionalHeader->Header.AddressOfEntryPoint; // RVA 382 Header->ImageBase = CP.Obj.OptionalHeader->Header.ImageBase; 383 Header->MajorOperatingSystemVersion = 384 CP.Obj.OptionalHeader->Header.MajorOperatingSystemVersion; 385 Header->MinorOperatingSystemVersion = 386 CP.Obj.OptionalHeader->Header.MinorOperatingSystemVersion; 387 Header->MajorImageVersion = CP.Obj.OptionalHeader->Header.MajorImageVersion; 388 Header->MinorImageVersion = CP.Obj.OptionalHeader->Header.MinorImageVersion; 389 Header->MajorSubsystemVersion = 390 CP.Obj.OptionalHeader->Header.MajorSubsystemVersion; 391 Header->MinorSubsystemVersion = 392 CP.Obj.OptionalHeader->Header.MinorSubsystemVersion; 393 Header->SizeOfImage = SizeOfImage; 394 Header->SizeOfHeaders = SizeOfHeaders; 395 Header->Subsystem = CP.Obj.OptionalHeader->Header.Subsystem; 396 Header->DLLCharacteristics = CP.Obj.OptionalHeader->Header.DLLCharacteristics; 397 Header->SizeOfStackReserve = CP.Obj.OptionalHeader->Header.SizeOfStackReserve; 398 Header->SizeOfStackCommit = CP.Obj.OptionalHeader->Header.SizeOfStackCommit; 399 Header->SizeOfHeapReserve = CP.Obj.OptionalHeader->Header.SizeOfHeapReserve; 400 Header->SizeOfHeapCommit = CP.Obj.OptionalHeader->Header.SizeOfHeapCommit; 401 Header->NumberOfRvaAndSize = COFF::NUM_DATA_DIRECTORIES + 1; 402 return BaseOfData; 403 } 404 405 static bool writeCOFF(COFFParser &CP, raw_ostream &OS) { 406 if (CP.isPE()) { 407 // PE files start with a DOS stub. 408 object::dos_header DH; 409 memset(&DH, 0, sizeof(DH)); 410 411 // DOS EXEs start with "MZ" magic. 412 DH.Magic[0] = 'M'; 413 DH.Magic[1] = 'Z'; 414 // Initializing the AddressOfRelocationTable is strictly optional but 415 // mollifies certain tools which expect it to have a value greater than 416 // 0x40. 417 DH.AddressOfRelocationTable = sizeof(DH); 418 // This is the address of the PE signature. 419 DH.AddressOfNewExeHeader = DOSStubSize; 420 421 // Write out our DOS stub. 422 OS.write(reinterpret_cast<char *>(&DH), sizeof(DH)); 423 // Write padding until we reach the position of where our PE signature 424 // should live. 425 OS.write_zeros(DOSStubSize - sizeof(DH)); 426 // Write out the PE signature. 427 OS.write(COFF::PEMagic, sizeof(COFF::PEMagic)); 428 } 429 if (CP.useBigObj()) { 430 OS << binary_le(static_cast<uint16_t>(COFF::IMAGE_FILE_MACHINE_UNKNOWN)) 431 << binary_le(static_cast<uint16_t>(0xffff)) 432 << binary_le( 433 static_cast<uint16_t>(COFF::BigObjHeader::MinBigObjectVersion)) 434 << binary_le(CP.Obj.Header.Machine) 435 << binary_le(CP.Obj.Header.TimeDateStamp); 436 OS.write(COFF::BigObjMagic, sizeof(COFF::BigObjMagic)); 437 OS << zeros(uint32_t(0)) << zeros(uint32_t(0)) << zeros(uint32_t(0)) 438 << zeros(uint32_t(0)) << binary_le(CP.Obj.Header.NumberOfSections) 439 << binary_le(CP.Obj.Header.PointerToSymbolTable) 440 << binary_le(CP.Obj.Header.NumberOfSymbols); 441 } else { 442 OS << binary_le(CP.Obj.Header.Machine) 443 << binary_le(static_cast<int16_t>(CP.Obj.Header.NumberOfSections)) 444 << binary_le(CP.Obj.Header.TimeDateStamp) 445 << binary_le(CP.Obj.Header.PointerToSymbolTable) 446 << binary_le(CP.Obj.Header.NumberOfSymbols) 447 << binary_le(CP.Obj.Header.SizeOfOptionalHeader) 448 << binary_le(CP.Obj.Header.Characteristics); 449 } 450 if (CP.isPE()) { 451 if (CP.is64Bit()) { 452 object::pe32plus_header PEH; 453 initializeOptionalHeader(CP, COFF::PE32Header::PE32_PLUS, &PEH); 454 OS.write(reinterpret_cast<char *>(&PEH), sizeof(PEH)); 455 } else { 456 object::pe32_header PEH; 457 uint32_t BaseOfData = 458 initializeOptionalHeader(CP, COFF::PE32Header::PE32, &PEH); 459 PEH.BaseOfData = BaseOfData; 460 OS.write(reinterpret_cast<char *>(&PEH), sizeof(PEH)); 461 } 462 for (const Optional<COFF::DataDirectory> &DD : 463 CP.Obj.OptionalHeader->DataDirectories) { 464 if (!DD.hasValue()) { 465 OS << zeros(uint32_t(0)); 466 OS << zeros(uint32_t(0)); 467 } else { 468 OS << binary_le(DD->RelativeVirtualAddress); 469 OS << binary_le(DD->Size); 470 } 471 } 472 OS << zeros(uint32_t(0)); 473 OS << zeros(uint32_t(0)); 474 } 475 476 assert(OS.tell() == CP.SectionTableStart); 477 // Output section table. 478 for (std::vector<COFFYAML::Section>::iterator i = CP.Obj.Sections.begin(), 479 e = CP.Obj.Sections.end(); 480 i != e; ++i) { 481 OS.write(i->Header.Name, COFF::NameSize); 482 OS << binary_le(i->Header.VirtualSize) 483 << binary_le(i->Header.VirtualAddress) 484 << binary_le(i->Header.SizeOfRawData) 485 << binary_le(i->Header.PointerToRawData) 486 << binary_le(i->Header.PointerToRelocations) 487 << binary_le(i->Header.PointerToLineNumbers) 488 << binary_le(i->Header.NumberOfRelocations) 489 << binary_le(i->Header.NumberOfLineNumbers) 490 << binary_le(i->Header.Characteristics); 491 } 492 assert(OS.tell() == CP.SectionTableStart + CP.SectionTableSize); 493 494 unsigned CurSymbol = 0; 495 StringMap<unsigned> SymbolTableIndexMap; 496 for (std::vector<COFFYAML::Symbol>::iterator I = CP.Obj.Symbols.begin(), 497 E = CP.Obj.Symbols.end(); 498 I != E; ++I) { 499 SymbolTableIndexMap[I->Name] = CurSymbol; 500 CurSymbol += 1 + I->Header.NumberOfAuxSymbols; 501 } 502 503 // Output section data. 504 for (const COFFYAML::Section &S : CP.Obj.Sections) { 505 if (S.Header.SizeOfRawData == 0 || S.Header.PointerToRawData == 0) 506 continue; 507 assert(S.Header.PointerToRawData >= OS.tell()); 508 OS.write_zeros(S.Header.PointerToRawData - OS.tell()); 509 S.SectionData.writeAsBinary(OS); 510 assert(S.Header.SizeOfRawData >= S.SectionData.binary_size()); 511 OS.write_zeros(S.Header.SizeOfRawData - S.SectionData.binary_size()); 512 if (S.Header.Characteristics & COFF::IMAGE_SCN_LNK_NRELOC_OVFL) 513 OS << binary_le<uint32_t>(/*VirtualAddress=*/ S.Relocations.size() + 1) 514 << binary_le<uint32_t>(/*SymbolTableIndex=*/ 0) 515 << binary_le<uint16_t>(/*Type=*/ 0); 516 for (const COFFYAML::Relocation &R : S.Relocations) { 517 uint32_t SymbolTableIndex; 518 if (R.SymbolTableIndex) { 519 if (!R.SymbolName.empty()) 520 WithColor::error() 521 << "Both SymbolName and SymbolTableIndex specified\n"; 522 SymbolTableIndex = *R.SymbolTableIndex; 523 } else { 524 SymbolTableIndex = SymbolTableIndexMap[R.SymbolName]; 525 } 526 OS << binary_le(R.VirtualAddress) << binary_le(SymbolTableIndex) 527 << binary_le(R.Type); 528 } 529 } 530 531 // Output symbol table. 532 533 for (std::vector<COFFYAML::Symbol>::const_iterator i = CP.Obj.Symbols.begin(), 534 e = CP.Obj.Symbols.end(); 535 i != e; ++i) { 536 OS.write(i->Header.Name, COFF::NameSize); 537 OS << binary_le(i->Header.Value); 538 if (CP.useBigObj()) 539 OS << binary_le(i->Header.SectionNumber); 540 else 541 OS << binary_le(static_cast<int16_t>(i->Header.SectionNumber)); 542 OS << binary_le(i->Header.Type) << binary_le(i->Header.StorageClass) 543 << binary_le(i->Header.NumberOfAuxSymbols); 544 545 if (i->FunctionDefinition) { 546 OS << binary_le(i->FunctionDefinition->TagIndex) 547 << binary_le(i->FunctionDefinition->TotalSize) 548 << binary_le(i->FunctionDefinition->PointerToLinenumber) 549 << binary_le(i->FunctionDefinition->PointerToNextFunction) 550 << zeros(i->FunctionDefinition->unused); 551 OS.write_zeros(CP.getSymbolSize() - COFF::Symbol16Size); 552 } 553 if (i->bfAndefSymbol) { 554 OS << zeros(i->bfAndefSymbol->unused1) 555 << binary_le(i->bfAndefSymbol->Linenumber) 556 << zeros(i->bfAndefSymbol->unused2) 557 << binary_le(i->bfAndefSymbol->PointerToNextFunction) 558 << zeros(i->bfAndefSymbol->unused3); 559 OS.write_zeros(CP.getSymbolSize() - COFF::Symbol16Size); 560 } 561 if (i->WeakExternal) { 562 OS << binary_le(i->WeakExternal->TagIndex) 563 << binary_le(i->WeakExternal->Characteristics) 564 << zeros(i->WeakExternal->unused); 565 OS.write_zeros(CP.getSymbolSize() - COFF::Symbol16Size); 566 } 567 if (!i->File.empty()) { 568 unsigned SymbolSize = CP.getSymbolSize(); 569 uint32_t NumberOfAuxRecords = 570 (i->File.size() + SymbolSize - 1) / SymbolSize; 571 uint32_t NumberOfAuxBytes = NumberOfAuxRecords * SymbolSize; 572 uint32_t NumZeros = NumberOfAuxBytes - i->File.size(); 573 OS.write(i->File.data(), i->File.size()); 574 OS.write_zeros(NumZeros); 575 } 576 if (i->SectionDefinition) { 577 OS << binary_le(i->SectionDefinition->Length) 578 << binary_le(i->SectionDefinition->NumberOfRelocations) 579 << binary_le(i->SectionDefinition->NumberOfLinenumbers) 580 << binary_le(i->SectionDefinition->CheckSum) 581 << binary_le(static_cast<int16_t>(i->SectionDefinition->Number)) 582 << binary_le(i->SectionDefinition->Selection) 583 << zeros(i->SectionDefinition->unused) 584 << binary_le(static_cast<int16_t>(i->SectionDefinition->Number >> 16)); 585 OS.write_zeros(CP.getSymbolSize() - COFF::Symbol16Size); 586 } 587 if (i->CLRToken) { 588 OS << binary_le(i->CLRToken->AuxType) << zeros(i->CLRToken->unused1) 589 << binary_le(i->CLRToken->SymbolTableIndex) 590 << zeros(i->CLRToken->unused2); 591 OS.write_zeros(CP.getSymbolSize() - COFF::Symbol16Size); 592 } 593 } 594 595 // Output string table. 596 if (CP.Obj.Header.PointerToSymbolTable) 597 OS.write(&CP.StringTable[0], CP.StringTable.size()); 598 return true; 599 } 600 601 namespace llvm { 602 namespace yaml { 603 604 bool yaml2coff(llvm::COFFYAML::Object &Doc, raw_ostream &Out, 605 ErrorHandler ErrHandler) { 606 COFFParser CP(Doc, ErrHandler); 607 if (!CP.parse()) { 608 ErrHandler("failed to parse YAML file"); 609 return false; 610 } 611 612 if (!layoutOptionalHeader(CP)) { 613 ErrHandler("failed to layout optional header for COFF file"); 614 return false; 615 } 616 617 if (!layoutCOFF(CP)) { 618 ErrHandler("failed to layout COFF file"); 619 return false; 620 } 621 if (!writeCOFF(CP, Out)) { 622 ErrHandler("failed to write COFF file"); 623 return false; 624 } 625 return true; 626 } 627 628 } // namespace yaml 629 } // namespace llvm 630