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
30using namespace llvm;
31
32namespace {
33
34/// This parses a yaml stream that represents a COFF object file.
35/// See docs/yaml2obj for the yaml scheema.
36struct 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
162enum { 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.
168static 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
179static yaml::BinaryRef
180toDebugS(ArrayRef<CodeViewYAML::YAMLDebugSubsection> Subsections,
181         const codeview::StringsAndChecksums &SC, BumpPtrAllocator &Allocator) {
182  using namespace codeview;
183  ExitOnError Err("Error occurred writing .debug$S section");
184  auto CVSS =
185      Err(CodeViewYAML::toCodeViewSubsectionList(Allocator, Subsections, SC));
186
187  std::vector<DebugSubsectionRecordBuilder> Builders;
188  uint32_t Size = sizeof(uint32_t);
189  for (auto &SS : CVSS) {
190    DebugSubsectionRecordBuilder B(SS, CodeViewContainer::ObjectFile);
191    Size += B.calculateSerializedLength();
192    Builders.push_back(std::move(B));
193  }
194  uint8_t *Buffer = Allocator.Allocate<uint8_t>(Size);
195  MutableArrayRef<uint8_t> Output(Buffer, Size);
196  BinaryStreamWriter Writer(Output, support::little);
197
198  Err(Writer.writeInteger<uint32_t>(COFF::DEBUG_SECTION_MAGIC));
199  for (const auto &B : Builders) {
200    Err(B.commit(Writer));
201  }
202  return {Output};
203}
204
205// Take a CP and assign addresses and sizes to everything. Returns false if the
206// layout is not valid to do.
207static bool layoutCOFF(COFFParser &CP) {
208  // The section table starts immediately after the header, including the
209  // optional header.
210  CP.SectionTableStart =
211      CP.getHeaderSize() + CP.Obj.Header.SizeOfOptionalHeader;
212  if (CP.isPE())
213    CP.SectionTableStart += DOSStubSize + sizeof(COFF::PEMagic);
214  CP.SectionTableSize = COFF::SectionSize * CP.Obj.Sections.size();
215
216  uint32_t CurrentSectionDataOffset =
217      CP.SectionTableStart + CP.SectionTableSize;
218
219  for (COFFYAML::Section &S : CP.Obj.Sections) {
220    // We support specifying exactly one of SectionData or Subsections.  So if
221    // there is already some SectionData, then we don't need to do any of this.
222    if (S.Name == ".debug$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
316template <typename value_type> struct binary_le_impl {
317  value_type Value;
318  binary_le_impl(value_type V) : Value(V) {}
319};
320
321template <typename value_type>
322raw_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
331template <typename value_type>
332binary_le_impl<value_type> binary_le(value_type V) {
333  return binary_le_impl<value_type>(V);
334}
335
336template <size_t NumBytes> struct zeros_impl {};
337
338template <size_t NumBytes>
339raw_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
346template <typename T> zeros_impl<sizeof(T)> zeros(const T &) {
347  return zeros_impl<sizeof(T)>();
348}
349
350template <typename T>
351static 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
405static 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
601namespace llvm {
602namespace yaml {
603
604bool 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