LLVM  8.0.0svn
WinCOFFObjectWriter.cpp
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1 //===- llvm/MC/WinCOFFObjectWriter.cpp ------------------------------------===//
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 // This file contains an implementation of a Win32 COFF object file writer.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/ADT/DenseMap.h"
15 #include "llvm/ADT/STLExtras.h"
16 #include "llvm/ADT/SmallString.h"
17 #include "llvm/ADT/SmallVector.h"
18 #include "llvm/ADT/StringRef.h"
19 #include "llvm/ADT/Twine.h"
20 #include "llvm/BinaryFormat/COFF.h"
21 #include "llvm/MC/MCAsmLayout.h"
22 #include "llvm/MC/MCAssembler.h"
23 #include "llvm/MC/MCContext.h"
24 #include "llvm/MC/MCExpr.h"
25 #include "llvm/MC/MCFixup.h"
26 #include "llvm/MC/MCFragment.h"
27 #include "llvm/MC/MCObjectWriter.h"
28 #include "llvm/MC/MCSection.h"
29 #include "llvm/MC/MCSectionCOFF.h"
30 #include "llvm/MC/MCSymbol.h"
31 #include "llvm/MC/MCSymbolCOFF.h"
32 #include "llvm/MC/MCValue.h"
35 #include "llvm/Support/Casting.h"
36 #include "llvm/Support/Endian.h"
38 #include "llvm/Support/JamCRC.h"
39 #include "llvm/Support/LEB128.h"
42 #include <algorithm>
43 #include <cassert>
44 #include <cstddef>
45 #include <cstdint>
46 #include <cstring>
47 #include <ctime>
48 #include <memory>
49 #include <string>
50 #include <vector>
51 
52 using namespace llvm;
54 
55 #define DEBUG_TYPE "WinCOFFObjectWriter"
56 
57 namespace {
58 
60 
62  ATWeakExternal,
63  ATFile,
64  ATSectionDefinition
65 };
66 
67 struct AuxSymbol {
69  COFF::Auxiliary Aux;
70 };
71 
72 class COFFSection;
73 
74 class COFFSymbol {
75 public:
76  COFF::symbol Data = {};
77 
78  using AuxiliarySymbols = SmallVector<AuxSymbol, 1>;
79 
80  name Name;
81  int Index;
82  AuxiliarySymbols Aux;
83  COFFSymbol *Other = nullptr;
84  COFFSection *Section = nullptr;
85  int Relocations = 0;
86  const MCSymbol *MC = nullptr;
87 
88  COFFSymbol(StringRef Name) : Name(Name) {}
89 
90  void set_name_offset(uint32_t Offset);
91 
92  int64_t getIndex() const { return Index; }
93  void setIndex(int Value) {
94  Index = Value;
95  if (MC)
96  MC->setIndex(static_cast<uint32_t>(Value));
97  }
98 };
99 
100 // This class contains staging data for a COFF relocation entry.
101 struct COFFRelocation {
103  COFFSymbol *Symb = nullptr;
104 
105  COFFRelocation() = default;
106 
107  static size_t size() { return COFF::RelocationSize; }
108 };
109 
110 using relocations = std::vector<COFFRelocation>;
111 
112 class COFFSection {
113 public:
114  COFF::section Header = {};
115 
116  std::string Name;
117  int Number;
118  MCSectionCOFF const *MCSection = nullptr;
119  COFFSymbol *Symbol = nullptr;
120  relocations Relocations;
121 
122  COFFSection(StringRef Name) : Name(Name) {}
123 };
124 
125 class WinCOFFObjectWriter : public MCObjectWriter {
126 public:
128 
129  using symbols = std::vector<std::unique_ptr<COFFSymbol>>;
130  using sections = std::vector<std::unique_ptr<COFFSection>>;
131 
132  using symbol_map = DenseMap<MCSymbol const *, COFFSymbol *>;
133  using section_map = DenseMap<MCSection const *, COFFSection *>;
134 
135  std::unique_ptr<MCWinCOFFObjectTargetWriter> TargetObjectWriter;
136 
137  // Root level file contents.
138  COFF::header Header = {};
139  sections Sections;
140  symbols Symbols;
142 
143  // Maps used during object file creation.
144  section_map SectionMap;
145  symbol_map SymbolMap;
146 
147  bool UseBigObj;
148 
149  bool EmitAddrsigSection = false;
150  MCSectionCOFF *AddrsigSection;
151  std::vector<const MCSymbol *> AddrsigSyms;
152 
153  WinCOFFObjectWriter(std::unique_ptr<MCWinCOFFObjectTargetWriter> MOTW,
154  raw_pwrite_stream &OS);
155 
156  void reset() override {
157  memset(&Header, 0, sizeof(Header));
158  Header.Machine = TargetObjectWriter->getMachine();
159  Sections.clear();
160  Symbols.clear();
161  Strings.clear();
162  SectionMap.clear();
163  SymbolMap.clear();
165  }
166 
167  COFFSymbol *createSymbol(StringRef Name);
168  COFFSymbol *GetOrCreateCOFFSymbol(const MCSymbol *Symbol);
169  COFFSection *createSection(StringRef Name);
170 
171  void defineSection(MCSectionCOFF const &Sec);
172 
173  COFFSymbol *getLinkedSymbol(const MCSymbol &Symbol);
174  void DefineSymbol(const MCSymbol &Symbol, MCAssembler &Assembler,
175  const MCAsmLayout &Layout);
176 
177  void SetSymbolName(COFFSymbol &S);
178  void SetSectionName(COFFSection &S);
179 
180  bool IsPhysicalSection(COFFSection *S);
181 
182  // Entity writing methods.
183 
184  void WriteFileHeader(const COFF::header &Header);
185  void WriteSymbol(const COFFSymbol &S);
186  void WriteAuxiliarySymbols(const COFFSymbol::AuxiliarySymbols &S);
187  void writeSectionHeaders();
188  void WriteRelocation(const COFF::relocation &R);
189  uint32_t writeSectionContents(MCAssembler &Asm, const MCAsmLayout &Layout,
190  const MCSection &MCSec);
191  void writeSection(MCAssembler &Asm, const MCAsmLayout &Layout,
192  const COFFSection &Sec, const MCSection &MCSec);
193 
194  // MCObjectWriter interface implementation.
195 
196  void executePostLayoutBinding(MCAssembler &Asm,
197  const MCAsmLayout &Layout) override;
198 
199  bool isSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
200  const MCSymbol &SymA,
201  const MCFragment &FB, bool InSet,
202  bool IsPCRel) const override;
203 
204  void recordRelocation(MCAssembler &Asm, const MCAsmLayout &Layout,
205  const MCFragment *Fragment, const MCFixup &Fixup,
206  MCValue Target, uint64_t &FixedValue) override;
207 
208  void createFileSymbols(MCAssembler &Asm);
209  void assignSectionNumbers();
210  void assignFileOffsets(MCAssembler &Asm, const MCAsmLayout &Layout);
211 
212  void emitAddrsigSection() override { EmitAddrsigSection = true; }
213  void addAddrsigSymbol(const MCSymbol *Sym) override {
214  AddrsigSyms.push_back(Sym);
215  }
216 
217  uint64_t writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
218 };
219 
220 } // end anonymous namespace
221 
222 //------------------------------------------------------------------------------
223 // Symbol class implementation
224 
225 // In the case that the name does not fit within 8 bytes, the offset
226 // into the string table is stored in the last 4 bytes instead, leaving
227 // the first 4 bytes as 0.
228 void COFFSymbol::set_name_offset(uint32_t Offset) {
229  write32le(Data.Name + 0, 0);
230  write32le(Data.Name + 4, Offset);
231 }
232 
233 //------------------------------------------------------------------------------
234 // WinCOFFObjectWriter class implementation
235 
236 WinCOFFObjectWriter::WinCOFFObjectWriter(
237  std::unique_ptr<MCWinCOFFObjectTargetWriter> MOTW, raw_pwrite_stream &OS)
238  : W(OS, support::little), TargetObjectWriter(std::move(MOTW)) {
239  Header.Machine = TargetObjectWriter->getMachine();
240 }
241 
242 COFFSymbol *WinCOFFObjectWriter::createSymbol(StringRef Name) {
243  Symbols.push_back(make_unique<COFFSymbol>(Name));
244  return Symbols.back().get();
245 }
246 
247 COFFSymbol *WinCOFFObjectWriter::GetOrCreateCOFFSymbol(const MCSymbol *Symbol) {
248  COFFSymbol *&Ret = SymbolMap[Symbol];
249  if (!Ret)
250  Ret = createSymbol(Symbol->getName());
251  return Ret;
252 }
253 
254 COFFSection *WinCOFFObjectWriter::createSection(StringRef Name) {
255  Sections.emplace_back(make_unique<COFFSection>(Name));
256  return Sections.back().get();
257 }
258 
259 static uint32_t getAlignment(const MCSectionCOFF &Sec) {
260  switch (Sec.getAlignment()) {
261  case 1:
263  case 2:
265  case 4:
267  case 8:
269  case 16:
271  case 32:
273  case 64:
275  case 128:
277  case 256:
279  case 512:
281  case 1024:
283  case 2048:
285  case 4096:
287  case 8192:
289  }
290  llvm_unreachable("unsupported section alignment");
291 }
292 
293 /// This function takes a section data object from the assembler
294 /// and creates the associated COFF section staging object.
295 void WinCOFFObjectWriter::defineSection(const MCSectionCOFF &MCSec) {
296  COFFSection *Section = createSection(MCSec.getSectionName());
297  COFFSymbol *Symbol = createSymbol(MCSec.getSectionName());
298  Section->Symbol = Symbol;
299  Symbol->Section = Section;
300  Symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_STATIC;
301 
302  // Create a COMDAT symbol if needed.
304  if (const MCSymbol *S = MCSec.getCOMDATSymbol()) {
305  COFFSymbol *COMDATSymbol = GetOrCreateCOFFSymbol(S);
306  if (COMDATSymbol->Section)
307  report_fatal_error("two sections have the same comdat");
308  COMDATSymbol->Section = Section;
309  }
310  }
311 
312  // In this case the auxiliary symbol is a Section Definition.
313  Symbol->Aux.resize(1);
314  Symbol->Aux[0] = {};
315  Symbol->Aux[0].AuxType = ATSectionDefinition;
316  Symbol->Aux[0].Aux.SectionDefinition.Selection = MCSec.getSelection();
317 
318  // Set section alignment.
319  Section->Header.Characteristics = MCSec.getCharacteristics();
320  Section->Header.Characteristics |= getAlignment(MCSec);
321 
322  // Bind internal COFF section to MC section.
323  Section->MCSection = &MCSec;
324  SectionMap[&MCSec] = Section;
325 }
326 
327 static uint64_t getSymbolValue(const MCSymbol &Symbol,
328  const MCAsmLayout &Layout) {
329  if (Symbol.isCommon() && Symbol.isExternal())
330  return Symbol.getCommonSize();
331 
332  uint64_t Res;
333  if (!Layout.getSymbolOffset(Symbol, Res))
334  return 0;
335 
336  return Res;
337 }
338 
339 COFFSymbol *WinCOFFObjectWriter::getLinkedSymbol(const MCSymbol &Symbol) {
340  if (!Symbol.isVariable())
341  return nullptr;
342 
343  const MCSymbolRefExpr *SymRef =
345  if (!SymRef)
346  return nullptr;
347 
348  const MCSymbol &Aliasee = SymRef->getSymbol();
349  if (!Aliasee.isUndefined())
350  return nullptr;
351  return GetOrCreateCOFFSymbol(&Aliasee);
352 }
353 
354 /// This function takes a symbol data object from the assembler
355 /// and creates the associated COFF symbol staging object.
356 void WinCOFFObjectWriter::DefineSymbol(const MCSymbol &MCSym,
357  MCAssembler &Assembler,
358  const MCAsmLayout &Layout) {
359  COFFSymbol *Sym = GetOrCreateCOFFSymbol(&MCSym);
360  const MCSymbol *Base = Layout.getBaseSymbol(MCSym);
361  COFFSection *Sec = nullptr;
362  if (Base && Base->getFragment()) {
363  Sec = SectionMap[Base->getFragment()->getParent()];
364  if (Sym->Section && Sym->Section != Sec)
365  report_fatal_error("conflicting sections for symbol");
366  }
367 
368  COFFSymbol *Local = nullptr;
369  if (cast<MCSymbolCOFF>(MCSym).isWeakExternal()) {
370  Sym->Data.StorageClass = COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;
371 
372  COFFSymbol *WeakDefault = getLinkedSymbol(MCSym);
373  if (!WeakDefault) {
374  std::string WeakName = (".weak." + MCSym.getName() + ".default").str();
375  WeakDefault = createSymbol(WeakName);
376  if (!Sec)
377  WeakDefault->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
378  else
379  WeakDefault->Section = Sec;
380  Local = WeakDefault;
381  }
382 
383  Sym->Other = WeakDefault;
384 
385  // Setup the Weak External auxiliary symbol.
386  Sym->Aux.resize(1);
387  memset(&Sym->Aux[0], 0, sizeof(Sym->Aux[0]));
388  Sym->Aux[0].AuxType = ATWeakExternal;
389  Sym->Aux[0].Aux.WeakExternal.TagIndex = 0;
390  Sym->Aux[0].Aux.WeakExternal.Characteristics =
392  } else {
393  if (!Base)
394  Sym->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
395  else
396  Sym->Section = Sec;
397  Local = Sym;
398  }
399 
400  if (Local) {
401  Local->Data.Value = getSymbolValue(MCSym, Layout);
402 
403  const MCSymbolCOFF &SymbolCOFF = cast<MCSymbolCOFF>(MCSym);
404  Local->Data.Type = SymbolCOFF.getType();
405  Local->Data.StorageClass = SymbolCOFF.getClass();
406 
407  // If no storage class was specified in the streamer, define it here.
408  if (Local->Data.StorageClass == COFF::IMAGE_SYM_CLASS_NULL) {
409  bool IsExternal = MCSym.isExternal() ||
410  (!MCSym.getFragment() && !MCSym.isVariable());
411 
412  Local->Data.StorageClass = IsExternal ? COFF::IMAGE_SYM_CLASS_EXTERNAL
414  }
415  }
416 
417  Sym->MC = &MCSym;
418 }
419 
420 // Maximum offsets for different string table entry encodings.
421 enum : unsigned { Max7DecimalOffset = 9999999U };
422 enum : uint64_t { MaxBase64Offset = 0xFFFFFFFFFULL }; // 64^6, including 0
423 
424 // Encode a string table entry offset in base 64, padded to 6 chars, and
425 // prefixed with a double slash: '//AAAAAA', '//AAAAAB', ...
426 // Buffer must be at least 8 bytes large. No terminating null appended.
427 static void encodeBase64StringEntry(char *Buffer, uint64_t Value) {
428  assert(Value > Max7DecimalOffset && Value <= MaxBase64Offset &&
429  "Illegal section name encoding for value");
430 
431  static const char Alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
432  "abcdefghijklmnopqrstuvwxyz"
433  "0123456789+/";
434 
435  Buffer[0] = '/';
436  Buffer[1] = '/';
437 
438  char *Ptr = Buffer + 7;
439  for (unsigned i = 0; i < 6; ++i) {
440  unsigned Rem = Value % 64;
441  Value /= 64;
442  *(Ptr--) = Alphabet[Rem];
443  }
444 }
445 
446 void WinCOFFObjectWriter::SetSectionName(COFFSection &S) {
447  if (S.Name.size() <= COFF::NameSize) {
448  std::memcpy(S.Header.Name, S.Name.c_str(), S.Name.size());
449  return;
450  }
451 
452  uint64_t StringTableEntry = Strings.getOffset(S.Name);
453  if (StringTableEntry <= Max7DecimalOffset) {
455  Twine('/').concat(Twine(StringTableEntry)).toVector(Buffer);
456  assert(Buffer.size() <= COFF::NameSize && Buffer.size() >= 2);
457  std::memcpy(S.Header.Name, Buffer.data(), Buffer.size());
458  return;
459  }
460  if (StringTableEntry <= MaxBase64Offset) {
461  // Starting with 10,000,000, offsets are encoded as base64.
462  encodeBase64StringEntry(S.Header.Name, StringTableEntry);
463  return;
464  }
465  report_fatal_error("COFF string table is greater than 64 GB.");
466 }
467 
468 void WinCOFFObjectWriter::SetSymbolName(COFFSymbol &S) {
469  if (S.Name.size() > COFF::NameSize)
470  S.set_name_offset(Strings.getOffset(S.Name));
471  else
472  std::memcpy(S.Data.Name, S.Name.c_str(), S.Name.size());
473 }
474 
475 bool WinCOFFObjectWriter::IsPhysicalSection(COFFSection *S) {
476  return (S->Header.Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) ==
477  0;
478 }
479 
480 //------------------------------------------------------------------------------
481 // entity writing methods
482 
483 void WinCOFFObjectWriter::WriteFileHeader(const COFF::header &Header) {
484  if (UseBigObj) {
485  W.write<uint16_t>(COFF::IMAGE_FILE_MACHINE_UNKNOWN);
486  W.write<uint16_t>(0xFFFF);
488  W.write<uint16_t>(Header.Machine);
489  W.write<uint32_t>(Header.TimeDateStamp);
490  W.OS.write(COFF::BigObjMagic, sizeof(COFF::BigObjMagic));
491  W.write<uint32_t>(0);
492  W.write<uint32_t>(0);
493  W.write<uint32_t>(0);
494  W.write<uint32_t>(0);
495  W.write<uint32_t>(Header.NumberOfSections);
496  W.write<uint32_t>(Header.PointerToSymbolTable);
497  W.write<uint32_t>(Header.NumberOfSymbols);
498  } else {
499  W.write<uint16_t>(Header.Machine);
500  W.write<uint16_t>(static_cast<int16_t>(Header.NumberOfSections));
501  W.write<uint32_t>(Header.TimeDateStamp);
502  W.write<uint32_t>(Header.PointerToSymbolTable);
503  W.write<uint32_t>(Header.NumberOfSymbols);
504  W.write<uint16_t>(Header.SizeOfOptionalHeader);
505  W.write<uint16_t>(Header.Characteristics);
506  }
507 }
508 
509 void WinCOFFObjectWriter::WriteSymbol(const COFFSymbol &S) {
510  W.OS.write(S.Data.Name, COFF::NameSize);
511  W.write<uint32_t>(S.Data.Value);
512  if (UseBigObj)
513  W.write<uint32_t>(S.Data.SectionNumber);
514  else
515  W.write<uint16_t>(static_cast<int16_t>(S.Data.SectionNumber));
516  W.write<uint16_t>(S.Data.Type);
517  W.OS << char(S.Data.StorageClass);
518  W.OS << char(S.Data.NumberOfAuxSymbols);
519  WriteAuxiliarySymbols(S.Aux);
520 }
521 
522 void WinCOFFObjectWriter::WriteAuxiliarySymbols(
523  const COFFSymbol::AuxiliarySymbols &S) {
524  for (const AuxSymbol &i : S) {
525  switch (i.AuxType) {
526  case ATWeakExternal:
527  W.write<uint32_t>(i.Aux.WeakExternal.TagIndex);
528  W.write<uint32_t>(i.Aux.WeakExternal.Characteristics);
529  W.OS.write_zeros(sizeof(i.Aux.WeakExternal.unused));
530  if (UseBigObj)
531  W.OS.write_zeros(COFF::Symbol32Size - COFF::Symbol16Size);
532  break;
533  case ATFile:
534  W.OS.write(reinterpret_cast<const char *>(&i.Aux),
535  UseBigObj ? COFF::Symbol32Size : COFF::Symbol16Size);
536  break;
537  case ATSectionDefinition:
538  W.write<uint32_t>(i.Aux.SectionDefinition.Length);
539  W.write<uint16_t>(i.Aux.SectionDefinition.NumberOfRelocations);
540  W.write<uint16_t>(i.Aux.SectionDefinition.NumberOfLinenumbers);
541  W.write<uint32_t>(i.Aux.SectionDefinition.CheckSum);
542  W.write<uint16_t>(static_cast<int16_t>(i.Aux.SectionDefinition.Number));
543  W.OS << char(i.Aux.SectionDefinition.Selection);
544  W.OS.write_zeros(sizeof(i.Aux.SectionDefinition.unused));
545  W.write<uint16_t>(static_cast<int16_t>(i.Aux.SectionDefinition.Number >> 16));
546  if (UseBigObj)
547  W.OS.write_zeros(COFF::Symbol32Size - COFF::Symbol16Size);
548  break;
549  }
550  }
551 }
552 
553 // Write the section header.
554 void WinCOFFObjectWriter::writeSectionHeaders() {
555  // Section numbers must be monotonically increasing in the section
556  // header, but our Sections array is not sorted by section number,
557  // so make a copy of Sections and sort it.
558  std::vector<COFFSection *> Arr;
559  for (auto &Section : Sections)
560  Arr.push_back(Section.get());
561  llvm::sort(Arr, [](const COFFSection *A, const COFFSection *B) {
562  return A->Number < B->Number;
563  });
564 
565  for (auto &Section : Arr) {
566  if (Section->Number == -1)
567  continue;
568 
569  COFF::section &S = Section->Header;
570  if (Section->Relocations.size() >= 0xffff)
572  W.OS.write(S.Name, COFF::NameSize);
573  W.write<uint32_t>(S.VirtualSize);
574  W.write<uint32_t>(S.VirtualAddress);
575  W.write<uint32_t>(S.SizeOfRawData);
576  W.write<uint32_t>(S.PointerToRawData);
577  W.write<uint32_t>(S.PointerToRelocations);
578  W.write<uint32_t>(S.PointerToLineNumbers);
579  W.write<uint16_t>(S.NumberOfRelocations);
580  W.write<uint16_t>(S.NumberOfLineNumbers);
581  W.write<uint32_t>(S.Characteristics);
582  }
583 }
584 
585 void WinCOFFObjectWriter::WriteRelocation(const COFF::relocation &R) {
586  W.write<uint32_t>(R.VirtualAddress);
587  W.write<uint32_t>(R.SymbolTableIndex);
588  W.write<uint16_t>(R.Type);
589 }
590 
591 // Write MCSec's contents. What this function does is essentially
592 // "Asm.writeSectionData(&MCSec, Layout)", but it's a bit complicated
593 // because it needs to compute a CRC.
594 uint32_t WinCOFFObjectWriter::writeSectionContents(MCAssembler &Asm,
595  const MCAsmLayout &Layout,
596  const MCSection &MCSec) {
597  // Save the contents of the section to a temporary buffer, we need this
598  // to CRC the data before we dump it into the object file.
600  raw_svector_ostream VecOS(Buf);
601  Asm.writeSectionData(VecOS, &MCSec, Layout);
602 
603  // Write the section contents to the object file.
604  W.OS << Buf;
605 
606  // Calculate our CRC with an initial value of '0', this is not how
607  // JamCRC is specified but it aligns with the expected output.
608  JamCRC JC(/*Init=*/0);
609  JC.update(Buf);
610  return JC.getCRC();
611 }
612 
613 void WinCOFFObjectWriter::writeSection(MCAssembler &Asm,
614  const MCAsmLayout &Layout,
615  const COFFSection &Sec,
616  const MCSection &MCSec) {
617  if (Sec.Number == -1)
618  return;
619 
620  // Write the section contents.
621  if (Sec.Header.PointerToRawData != 0) {
622  assert(W.OS.tell() == Sec.Header.PointerToRawData &&
623  "Section::PointerToRawData is insane!");
624 
625  uint32_t CRC = writeSectionContents(Asm, Layout, MCSec);
626 
627  // Update the section definition auxiliary symbol to record the CRC.
628  COFFSection *Sec = SectionMap[&MCSec];
629  COFFSymbol::AuxiliarySymbols &AuxSyms = Sec->Symbol->Aux;
630  assert(AuxSyms.size() == 1 && AuxSyms[0].AuxType == ATSectionDefinition);
631  AuxSymbol &SecDef = AuxSyms[0];
632  SecDef.Aux.SectionDefinition.CheckSum = CRC;
633  }
634 
635  // Write relocations for this section.
636  if (Sec.Relocations.empty()) {
637  assert(Sec.Header.PointerToRelocations == 0 &&
638  "Section::PointerToRelocations is insane!");
639  return;
640  }
641 
642  assert(W.OS.tell() == Sec.Header.PointerToRelocations &&
643  "Section::PointerToRelocations is insane!");
644 
645  if (Sec.Relocations.size() >= 0xffff) {
646  // In case of overflow, write actual relocation count as first
647  // relocation. Including the synthetic reloc itself (+ 1).
649  R.VirtualAddress = Sec.Relocations.size() + 1;
650  R.SymbolTableIndex = 0;
651  R.Type = 0;
652  WriteRelocation(R);
653  }
654 
655  for (const auto &Relocation : Sec.Relocations)
656  WriteRelocation(Relocation.Data);
657 }
658 
659 ////////////////////////////////////////////////////////////////////////////////
660 // MCObjectWriter interface implementations
661 
662 void WinCOFFObjectWriter::executePostLayoutBinding(MCAssembler &Asm,
663  const MCAsmLayout &Layout) {
664  if (EmitAddrsigSection) {
665  AddrsigSection = Asm.getContext().getCOFFSection(
666  ".llvm_addrsig", COFF::IMAGE_SCN_LNK_REMOVE,
668  Asm.registerSection(*AddrsigSection);
669  }
670 
671  // "Define" each section & symbol. This creates section & symbol
672  // entries in the staging area.
673  for (const auto &Section : Asm)
674  defineSection(static_cast<const MCSectionCOFF &>(Section));
675 
676  for (const MCSymbol &Symbol : Asm.symbols())
677  if (!Symbol.isTemporary())
678  DefineSymbol(Symbol, Asm, Layout);
679 }
680 
681 bool WinCOFFObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(
682  const MCAssembler &Asm, const MCSymbol &SymA, const MCFragment &FB,
683  bool InSet, bool IsPCRel) const {
684  // Don't drop relocations between functions, even if they are in the same text
685  // section. Multiple Visual C++ linker features depend on having the
686  // relocations present. The /INCREMENTAL flag will cause these relocations to
687  // point to thunks, and the /GUARD:CF flag assumes that it can use relocations
688  // to approximate the set of all address taken functions. LLD's implementation
689  // of /GUARD:CF also relies on the existance of these relocations.
690  uint16_t Type = cast<MCSymbolCOFF>(SymA).getType();
692  return false;
694  InSet, IsPCRel);
695 }
696 
697 void WinCOFFObjectWriter::recordRelocation(MCAssembler &Asm,
698  const MCAsmLayout &Layout,
699  const MCFragment *Fragment,
700  const MCFixup &Fixup, MCValue Target,
701  uint64_t &FixedValue) {
702  assert(Target.getSymA() && "Relocation must reference a symbol!");
703 
704  const MCSymbol &A = Target.getSymA()->getSymbol();
705  if (!A.isRegistered()) {
706  Asm.getContext().reportError(Fixup.getLoc(),
707  Twine("symbol '") + A.getName() +
708  "' can not be undefined");
709  return;
710  }
711  if (A.isTemporary() && A.isUndefined()) {
712  Asm.getContext().reportError(Fixup.getLoc(),
713  Twine("assembler label '") + A.getName() +
714  "' can not be undefined");
715  return;
716  }
717 
718  MCSection *MCSec = Fragment->getParent();
719 
720  // Mark this symbol as requiring an entry in the symbol table.
721  assert(SectionMap.find(MCSec) != SectionMap.end() &&
722  "Section must already have been defined in executePostLayoutBinding!");
723 
724  COFFSection *Sec = SectionMap[MCSec];
725  const MCSymbolRefExpr *SymB = Target.getSymB();
726 
727  if (SymB) {
728  const MCSymbol *B = &SymB->getSymbol();
729  if (!B->getFragment()) {
730  Asm.getContext().reportError(
731  Fixup.getLoc(),
732  Twine("symbol '") + B->getName() +
733  "' can not be undefined in a subtraction expression");
734  return;
735  }
736 
737  // Offset of the symbol in the section
738  int64_t OffsetOfB = Layout.getSymbolOffset(*B);
739 
740  // Offset of the relocation in the section
741  int64_t OffsetOfRelocation =
742  Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
743 
744  FixedValue = (OffsetOfRelocation - OffsetOfB) + Target.getConstant();
745  } else {
746  FixedValue = Target.getConstant();
747  }
748 
749  COFFRelocation Reloc;
750 
751  Reloc.Data.SymbolTableIndex = 0;
752  Reloc.Data.VirtualAddress = Layout.getFragmentOffset(Fragment);
753 
754  // Turn relocations for temporary symbols into section relocations.
755  if (A.isTemporary()) {
756  MCSection *TargetSection = &A.getSection();
757  assert(
758  SectionMap.find(TargetSection) != SectionMap.end() &&
759  "Section must already have been defined in executePostLayoutBinding!");
760  Reloc.Symb = SectionMap[TargetSection]->Symbol;
761  FixedValue += Layout.getSymbolOffset(A);
762  } else {
763  assert(
764  SymbolMap.find(&A) != SymbolMap.end() &&
765  "Symbol must already have been defined in executePostLayoutBinding!");
766  Reloc.Symb = SymbolMap[&A];
767  }
768 
769  ++Reloc.Symb->Relocations;
770 
771  Reloc.Data.VirtualAddress += Fixup.getOffset();
772  Reloc.Data.Type = TargetObjectWriter->getRelocType(
773  Asm.getContext(), Target, Fixup, SymB, Asm.getBackend());
774 
775  // FIXME: Can anyone explain what this does other than adjust for the size
776  // of the offset?
777  if ((Header.Machine == COFF::IMAGE_FILE_MACHINE_AMD64 &&
778  Reloc.Data.Type == COFF::IMAGE_REL_AMD64_REL32) ||
780  Reloc.Data.Type == COFF::IMAGE_REL_I386_REL32))
781  FixedValue += 4;
782 
783  if (Header.Machine == COFF::IMAGE_FILE_MACHINE_ARMNT) {
784  switch (Reloc.Data.Type) {
791  break;
794  // IMAGE_REL_ARM_BRANCH11 and IMAGE_REL_ARM_BLX11 are only used for
795  // pre-ARMv7, which implicitly rules it out of ARMNT (it would be valid
796  // for Windows CE).
800  // IMAGE_REL_ARM_BRANCH24, IMAGE_REL_ARM_BLX24, IMAGE_REL_ARM_MOV32A are
801  // only used for ARM mode code, which is documented as being unsupported
802  // by Windows on ARM. Empirical proof indicates that masm is able to
803  // generate the relocations however the rest of the MSVC toolchain is
804  // unable to handle it.
805  llvm_unreachable("unsupported relocation");
806  break;
808  break;
812  // IMAGE_REL_BRANCH20T, IMAGE_REL_ARM_BRANCH24T, IMAGE_REL_ARM_BLX23T all
813  // perform a 4 byte adjustment to the relocation. Relative branches are
814  // offset by 4 on ARM, however, because there is no RELA relocations, all
815  // branches are offset by 4.
816  FixedValue = FixedValue + 4;
817  break;
818  }
819  }
820 
821  // The fixed value never makes sense for section indices, ignore it.
822  if (Fixup.getKind() == FK_SecRel_2)
823  FixedValue = 0;
824 
825  if (TargetObjectWriter->recordRelocation(Fixup))
826  Sec->Relocations.push_back(Reloc);
827 }
828 
829 static std::time_t getTime() {
830  std::time_t Now = time(nullptr);
831  if (Now < 0 || !isUInt<32>(Now))
832  return UINT32_MAX;
833  return Now;
834 }
835 
836 // Create .file symbols.
837 void WinCOFFObjectWriter::createFileSymbols(MCAssembler &Asm) {
838  for (const std::string &Name : Asm.getFileNames()) {
839  // round up to calculate the number of auxiliary symbols required
840  unsigned SymbolSize = UseBigObj ? COFF::Symbol32Size : COFF::Symbol16Size;
841  unsigned Count = (Name.size() + SymbolSize - 1) / SymbolSize;
842 
843  COFFSymbol *File = createSymbol(".file");
844  File->Data.SectionNumber = COFF::IMAGE_SYM_DEBUG;
845  File->Data.StorageClass = COFF::IMAGE_SYM_CLASS_FILE;
846  File->Aux.resize(Count);
847 
848  unsigned Offset = 0;
849  unsigned Length = Name.size();
850  for (auto &Aux : File->Aux) {
851  Aux.AuxType = ATFile;
852 
853  if (Length > SymbolSize) {
854  memcpy(&Aux.Aux, Name.c_str() + Offset, SymbolSize);
855  Length = Length - SymbolSize;
856  } else {
857  memcpy(&Aux.Aux, Name.c_str() + Offset, Length);
858  memset((char *)&Aux.Aux + Length, 0, SymbolSize - Length);
859  break;
860  }
861 
862  Offset += SymbolSize;
863  }
864  }
865 }
866 
867 static bool isAssociative(const COFFSection &Section) {
868  return Section.Symbol->Aux[0].Aux.SectionDefinition.Selection ==
870 }
871 
872 void WinCOFFObjectWriter::assignSectionNumbers() {
873  size_t I = 1;
874  auto Assign = [&](COFFSection &Section) {
875  Section.Number = I;
876  Section.Symbol->Data.SectionNumber = I;
877  Section.Symbol->Aux[0].Aux.SectionDefinition.Number = I;
878  ++I;
879  };
880 
881  // Although it is not explicitly requested by the Microsoft COFF spec,
882  // we should avoid emitting forward associative section references,
883  // because MSVC link.exe as of 2017 cannot handle that.
884  for (const std::unique_ptr<COFFSection> &Section : Sections)
885  if (!isAssociative(*Section))
886  Assign(*Section);
887  for (const std::unique_ptr<COFFSection> &Section : Sections)
888  if (isAssociative(*Section))
889  Assign(*Section);
890 }
891 
892 // Assign file offsets to COFF object file structures.
893 void WinCOFFObjectWriter::assignFileOffsets(MCAssembler &Asm,
894  const MCAsmLayout &Layout) {
895  unsigned Offset = W.OS.tell();
896 
897  Offset += UseBigObj ? COFF::Header32Size : COFF::Header16Size;
898  Offset += COFF::SectionSize * Header.NumberOfSections;
899 
900  for (const auto &Section : Asm) {
901  COFFSection *Sec = SectionMap[&Section];
902 
903  if (Sec->Number == -1)
904  continue;
905 
906  Sec->Header.SizeOfRawData = Layout.getSectionAddressSize(&Section);
907 
908  if (IsPhysicalSection(Sec)) {
909  Sec->Header.PointerToRawData = Offset;
910  Offset += Sec->Header.SizeOfRawData;
911  }
912 
913  if (!Sec->Relocations.empty()) {
914  bool RelocationsOverflow = Sec->Relocations.size() >= 0xffff;
915 
916  if (RelocationsOverflow) {
917  // Signal overflow by setting NumberOfRelocations to max value. Actual
918  // size is found in reloc #0. Microsoft tools understand this.
919  Sec->Header.NumberOfRelocations = 0xffff;
920  } else {
921  Sec->Header.NumberOfRelocations = Sec->Relocations.size();
922  }
923  Sec->Header.PointerToRelocations = Offset;
924 
925  if (RelocationsOverflow) {
926  // Reloc #0 will contain actual count, so make room for it.
927  Offset += COFF::RelocationSize;
928  }
929 
930  Offset += COFF::RelocationSize * Sec->Relocations.size();
931 
932  for (auto &Relocation : Sec->Relocations) {
933  assert(Relocation.Symb->getIndex() != -1);
934  Relocation.Data.SymbolTableIndex = Relocation.Symb->getIndex();
935  }
936  }
937 
938  assert(Sec->Symbol->Aux.size() == 1 &&
939  "Section's symbol must have one aux!");
940  AuxSymbol &Aux = Sec->Symbol->Aux[0];
941  assert(Aux.AuxType == ATSectionDefinition &&
942  "Section's symbol's aux symbol must be a Section Definition!");
943  Aux.Aux.SectionDefinition.Length = Sec->Header.SizeOfRawData;
944  Aux.Aux.SectionDefinition.NumberOfRelocations =
945  Sec->Header.NumberOfRelocations;
946  Aux.Aux.SectionDefinition.NumberOfLinenumbers =
947  Sec->Header.NumberOfLineNumbers;
948  }
949 
950  Header.PointerToSymbolTable = Offset;
951 }
952 
953 uint64_t WinCOFFObjectWriter::writeObject(MCAssembler &Asm,
954  const MCAsmLayout &Layout) {
955  uint64_t StartOffset = W.OS.tell();
956 
957  if (Sections.size() > INT32_MAX)
959  "PE COFF object files can't have more than 2147483647 sections");
960 
961  UseBigObj = Sections.size() > COFF::MaxNumberOfSections16;
962  Header.NumberOfSections = Sections.size();
963  Header.NumberOfSymbols = 0;
964 
965  assignSectionNumbers();
966  createFileSymbols(Asm);
967 
968  for (auto &Symbol : Symbols) {
969  // Update section number & offset for symbols that have them.
970  if (Symbol->Section)
971  Symbol->Data.SectionNumber = Symbol->Section->Number;
972  Symbol->setIndex(Header.NumberOfSymbols++);
973  // Update auxiliary symbol info.
974  Symbol->Data.NumberOfAuxSymbols = Symbol->Aux.size();
975  Header.NumberOfSymbols += Symbol->Data.NumberOfAuxSymbols;
976  }
977 
978  // Build string table.
979  for (const auto &S : Sections)
980  if (S->Name.size() > COFF::NameSize)
981  Strings.add(S->Name);
982  for (const auto &S : Symbols)
983  if (S->Name.size() > COFF::NameSize)
984  Strings.add(S->Name);
985  Strings.finalize();
986 
987  // Set names.
988  for (const auto &S : Sections)
989  SetSectionName(*S);
990  for (auto &S : Symbols)
991  SetSymbolName(*S);
992 
993  // Fixup weak external references.
994  for (auto &Symbol : Symbols) {
995  if (Symbol->Other) {
996  assert(Symbol->getIndex() != -1);
997  assert(Symbol->Aux.size() == 1 && "Symbol must contain one aux symbol!");
998  assert(Symbol->Aux[0].AuxType == ATWeakExternal &&
999  "Symbol's aux symbol must be a Weak External!");
1000  Symbol->Aux[0].Aux.WeakExternal.TagIndex = Symbol->Other->getIndex();
1001  }
1002  }
1003 
1004  // Fixup associative COMDAT sections.
1005  for (auto &Section : Sections) {
1006  if (Section->Symbol->Aux[0].Aux.SectionDefinition.Selection !=
1008  continue;
1009 
1010  const MCSectionCOFF &MCSec = *Section->MCSection;
1011  const MCSymbol *AssocMCSym = MCSec.getCOMDATSymbol();
1012  assert(AssocMCSym);
1013 
1014  // It's an error to try to associate with an undefined symbol or a symbol
1015  // without a section.
1016  if (!AssocMCSym->isInSection()) {
1017  Asm.getContext().reportError(
1018  SMLoc(), Twine("cannot make section ") + MCSec.getSectionName() +
1019  Twine(" associative with sectionless symbol ") +
1020  AssocMCSym->getName());
1021  continue;
1022  }
1023 
1024  const auto *AssocMCSec = cast<MCSectionCOFF>(&AssocMCSym->getSection());
1025  assert(SectionMap.count(AssocMCSec));
1026  COFFSection *AssocSec = SectionMap[AssocMCSec];
1027 
1028  // Skip this section if the associated section is unused.
1029  if (AssocSec->Number == -1)
1030  continue;
1031 
1032  Section->Symbol->Aux[0].Aux.SectionDefinition.Number = AssocSec->Number;
1033  }
1034 
1035  // Create the contents of the .llvm_addrsig section.
1036  if (EmitAddrsigSection) {
1037  auto Frag = new MCDataFragment(AddrsigSection);
1038  Frag->setLayoutOrder(0);
1039  raw_svector_ostream OS(Frag->getContents());
1040  for (const MCSymbol *S : AddrsigSyms) {
1041  if (!S->isTemporary()) {
1042  encodeULEB128(S->getIndex(), OS);
1043  continue;
1044  }
1045 
1046  MCSection *TargetSection = &S->getSection();
1047  assert(SectionMap.find(TargetSection) != SectionMap.end() &&
1048  "Section must already have been defined in "
1049  "executePostLayoutBinding!");
1050  encodeULEB128(SectionMap[TargetSection]->Symbol->getIndex(), OS);
1051  }
1052  }
1053 
1054  assignFileOffsets(Asm, Layout);
1055 
1056  // MS LINK expects to be able to use this timestamp to implement their
1057  // /INCREMENTAL feature.
1058  if (Asm.isIncrementalLinkerCompatible()) {
1059  Header.TimeDateStamp = getTime();
1060  } else {
1061  // Have deterministic output if /INCREMENTAL isn't needed. Also matches GNU.
1062  Header.TimeDateStamp = 0;
1063  }
1064 
1065  // Write it all to disk...
1066  WriteFileHeader(Header);
1067  writeSectionHeaders();
1068 
1069  // Write section contents.
1070  sections::iterator I = Sections.begin();
1071  sections::iterator IE = Sections.end();
1072  MCAssembler::iterator J = Asm.begin();
1073  MCAssembler::iterator JE = Asm.end();
1074  for (; I != IE && J != JE; ++I, ++J)
1075  writeSection(Asm, Layout, **I, *J);
1076 
1077  assert(W.OS.tell() == Header.PointerToSymbolTable &&
1078  "Header::PointerToSymbolTable is insane!");
1079 
1080  // Write a symbol table.
1081  for (auto &Symbol : Symbols)
1082  if (Symbol->getIndex() != -1)
1083  WriteSymbol(*Symbol);
1084 
1085  // Write a string table, which completes the entire COFF file.
1086  Strings.write(W.OS);
1087 
1088  return W.OS.tell() - StartOffset;
1089 }
1090 
1092  : Machine(Machine_) {}
1093 
1094 // Pin the vtable to this file.
1095 void MCWinCOFFObjectTargetWriter::anchor() {}
1096 
1097 //------------------------------------------------------------------------------
1098 // WinCOFFObjectWriter factory function
1099 
1100 std::unique_ptr<MCObjectWriter> llvm::createWinCOFFObjectWriter(
1101  std::unique_ptr<MCWinCOFFObjectTargetWriter> MOTW, raw_pwrite_stream &OS) {
1102  return llvm::make_unique<WinCOFFObjectWriter>(std::move(MOTW), OS);
1103 }
constexpr bool isUInt< 32 >(uint64_t x)
Definition: MathExtras.h:349
Instances of this class represent a uniqued identifier for a section in the current translation unit...
Definition: MCSection.h:39
uint32_t getCRC() const
Definition: JamCRC.h:42
static uint64_t getSymbolValue(const MCSymbol &Symbol, const MCAsmLayout &Layout)
uint32_t getIndex() const
Get the (implementation defined) index.
Definition: MCSymbol.h:310
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:139
This class represents lattice values for constants.
Definition: AllocatorList.h:24
bool isVariable() const
isVariable - Check if this is a variable symbol.
Definition: MCSymbol.h:294
This represents an "assembler immediate".
Definition: MCValue.h:40
uint64_t getSectionAddressSize(const MCSection *Sec) const
Get the address space size of the given section, as it effects layout.
Definition: MCFragment.cpp:176
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:42
uint32_t SizeOfRawData
Definition: COFF.h:275
iterator begin()
Definition: MCAssembler.h:337
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE size_t size() const
size - Get the string size.
Definition: StringRef.h:138
char Name[NameSize]
Definition: COFF.h:272
static void encodeBase64StringEntry(char *Buffer, uint64_t Value)
static std::time_t getTime()
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:510
void write32le(void *P, uint32_t V)
Definition: Endian.h:404
bool isCommon() const
Is this a &#39;common&#39; symbol.
Definition: MCSymbol.h:380
Defines the object file and target independent interfaces used by the assembler backend to write nati...
uint16_t Machine
Definition: COFF.h:67
static const char BigObjMagic[]
Definition: COFF.h:39
MCSectionCOFF * getCOFFSection(StringRef Section, unsigned Characteristics, SectionKind Kind, StringRef COMDATSymName, int Selection, unsigned UniqueID=GenericSectionID, const char *BeginSymName=nullptr)
Definition: MCContext.cpp:422
Encode information on a single operation to perform on a byte sequence (e.g., an encoded instruction)...
Definition: MCFixup.h:74
unsigned getAlignment() const
Definition: MCSection.h:121
This represents a section on Windows.
Definition: MCSectionCOFF.h:27
MCContext & getContext() const
Definition: MCAssembler.h:285
int64_t getConstant() const
Definition: MCValue.h:47
const MCSymbolRefExpr * getSymB() const
Definition: MCValue.h:49
static uint32_t getAlignment(const MCSectionCOFF &Sec)
uint16_t Characteristics
Definition: COFF.h:73
amdgpu Simplify well known AMD library false Value Value const Twine & Name
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
Encapsulates the layout of an assembly file at a particular point in time.
Definition: MCAsmLayout.h:29
bool isInSection() const
isInSection - Check if this symbol is defined in some section (i.e., it is defined but not absolute)...
Definition: MCSymbol.h:252
bool registerSection(MCSection &Section)
uint32_t PointerToSymbolTable
Definition: COFF.h:70
Represent a reference to a symbol from inside an expression.
Definition: MCExpr.h:166
const int32_t MaxNumberOfSections16
Definition: COFF.h:34
ELFYAML::ELF_STO Other
Definition: ELFYAML.cpp:783
ArrayRef< std::string > getFileNames()
Definition: MCAssembler.h:443
Utility for building string tables with deduplicated suffixes.
A two-byte section relative fixup.
Definition: MCFixup.h:41
unsigned getCharacteristics() const
Definition: MCSectionCOFF.h:73
SmallString - A SmallString is just a SmallVector with methods and accessors that make it work better...
Definition: SmallString.h:26
COFF::MachineTypes Machine
Definition: COFFYAML.cpp:363
Type is formed as (base + (derived << SCT_COMPLEX_TYPE_SHIFT))
Definition: COFF.h:266
iterator end()
Definition: MCAssembler.h:340
iterator find(const_arg_type_t< KeyT > Val)
Definition: DenseMap.h:176
uint16_t SizeOfOptionalHeader
Definition: COFF.h:72
uint32_t SymbolTableIndex
Definition: COFF.h:327
static GCRegistry::Add< OcamlGC > B("ocaml", "ocaml 3.10-compatible GC")
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
virtual void reset()
lifetime management
bool getSymbolOffset(const MCSymbol &S, uint64_t &Val) const
Get the offset of the given symbol, as computed in the current layout.
Definition: MCFragment.cpp:130
bool isTemporary() const
isTemporary - Check if this is an assembler temporary symbol.
Definition: MCSymbol.h:220
const MCSymbolRefExpr * getSymA() const
Definition: MCValue.h:48
uint64_t getCommonSize() const
Return the size of a &#39;common&#39; symbol.
Definition: MCSymbol.h:336
void reportError(SMLoc L, const Twine &Msg)
Definition: MCContext.cpp:612
DenseMap< SymbolStringPtr, JITEvaluatedSymbol > SymbolMap
A map from symbol names (as SymbolStringPtrs) to JITSymbols (address/flags pairs).
Definition: Core.h:48
uint32_t getOffset() const
Definition: MCFixup.h:125
void writeSectionData(raw_ostream &OS, const MCSection *Section, const MCAsmLayout &Layout) const
Emit the section contents to OS.
void toVector(SmallVectorImpl< char > &Out) const
Append the concatenated string into the given SmallString or SmallVector.
Definition: Twine.cpp:33
bool isExternal() const
Definition: MCSymbol.h:393
size_t size() const
Definition: SmallVector.h:53
StringRef getSectionName() const
Definition: MCSectionCOFF.h:72
static wasm::ValType getType(const TargetRegisterClass *RC)
uint16_t NumberOfLineNumbers
Definition: COFF.h:280
uint32_t VirtualAddress
Definition: COFF.h:274
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
std::unique_ptr< MCObjectWriter > createWinCOFFObjectWriter(std::unique_ptr< MCWinCOFFObjectTargetWriter > MOTW, raw_pwrite_stream &OS)
Construct a new Win COFF writer instance.
uint32_t TimeDateStamp
Definition: COFF.h:69
uint64_t getFragmentOffset(const MCFragment *F) const
Get the offset of the given fragment inside its containing section.
Definition: MCFragment.cpp:78
void sort(IteratorTy Start, IteratorTy End)
Definition: STLExtras.h:1110
PowerPC TLS Dynamic Call Fixup
SMLoc getLoc() const
Definition: MCFixup.h:166
COFFYAML::AuxSymbolType AuxType
Definition: COFFYAML.cpp:345
auto size(R &&Range, typename std::enable_if< std::is_same< typename std::iterator_traits< decltype(Range.begin())>::iterator_category, std::random_access_iterator_tag >::value, void >::type *=nullptr) -> decltype(std::distance(Range.begin(), Range.end()))
Get the size of a range.
Definition: STLExtras.h:1161
uint32_t PointerToRelocations
Definition: COFF.h:277
MCAsmBackend & getBackend() const
Definition: MCAssembler.h:293
MCSymbol * getCOMDATSymbol() const
Definition: MCSectionCOFF.h:74
unsigned encodeULEB128(uint64_t Value, raw_ostream &OS, unsigned PadTo=0)
Utility function to encode a ULEB128 value to an output stream.
Definition: LEB128.h:81
const MCSymbol & getSymbol() const
Definition: MCExpr.h:336
bool isUndefined(bool SetUsed=true) const
isUndefined - Check if this symbol undefined (i.e., implicitly defined).
Definition: MCSymbol.h:257
MCFragment * getFragment(bool SetUsed=true) const
Definition: MCSymbol.h:384
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:847
An iterator type that allows iterating over the pointees via some other iterator. ...
Definition: iterator.h:287
static SectionKind getMetadata()
Definition: SectionKind.h:179
uint32_t PointerToRawData
Definition: COFF.h:276
uint32_t VirtualSize
Definition: COFF.h:273
Target - Wrapper for Target specific information.
MCSection * getParent() const
Definition: MCFragment.h:99
int getSelection() const
Definition: MCSectionCOFF.h:75
MCSection & getSection() const
Get the section associated with a defined, non-absolute symbol.
Definition: MCSymbol.h:267
uint32_t NumberOfSymbols
Definition: COFF.h:71
virtual bool isSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm, const MCSymbol &A, const MCSymbol &B, bool InSet) const
Adapter to write values to a stream in a particular byte order.
Definition: EndianStream.h:52
pointer data()
Return a pointer to the vector&#39;s buffer, even if empty().
Definition: SmallVector.h:149
int32_t NumberOfSections
Definition: COFF.h:68
#define I(x, y, z)
Definition: MD5.cpp:58
iterator end()
Definition: DenseMap.h:109
LLVM_NODISCARD std::enable_if<!is_simple_type< Y >::value, typename cast_retty< X, const Y >::ret_type >::type dyn_cast(const Y &Val)
Definition: Casting.h:323
uint16_t getClass() const
Definition: MCSymbolCOFF.h:41
StringRef getName() const
getName - Get the symbol name.
Definition: MCSymbol.h:203
An abstract base class for streams implementations that also support a pwrite operation.
Definition: raw_ostream.h:341
Fragment for data and encoded instructions.
Definition: MCFragment.h:242
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
uint16_t NumberOfRelocations
Definition: COFF.h:279
bool isIncrementalLinkerCompatible() const
Definition: MCAssembler.h:314
const MCExpr * getVariableValue(bool SetUsed=true) const
getVariableValue - Get the value for variable symbols.
Definition: MCSymbol.h:299
LLVM Value Representation.
Definition: Value.h:73
static const char * name
void update(ArrayRef< char > Data)
Definition: JamCRC.cpp:92
uint32_t PointerToLineNumbers
Definition: COFF.h:278
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
uint16_t getType() const
Definition: MCSymbolCOFF.h:34
Represents a location in source code.
Definition: SMLoc.h:24
static bool isAssociative(const COFFSection &Section)
uint32_t Characteristics
Definition: COFF.h:281
void setIndex(uint32_t Value) const
Set the (implementation defined) index.
Definition: MCSymbol.h:315
Twine concat(const Twine &Suffix) const
Definition: Twine.h:486
const MCSymbol * getBaseSymbol(const MCSymbol &Symbol) const
If this symbol is equivalent to A + Constant, return A.
Definition: MCFragment.cpp:140
uint32_t VirtualAddress
Definition: COFF.h:326
A function that returns a base type.
Definition: COFF.h:262