LLVM  6.0.0svn
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"
41 #include <algorithm>
42 #include <cassert>
43 #include <cstddef>
44 #include <cstdint>
45 #include <cstring>
46 #include <ctime>
47 #include <memory>
48 #include <string>
49 #include <vector>
50 
51 using namespace llvm;
53 
54 #define DEBUG_TYPE "WinCOFFObjectWriter"
55 
56 namespace {
57 
59 
61  ATFunctionDefinition,
62  ATbfAndefSymbol,
63  ATWeakExternal,
64  ATFile,
65  ATSectionDefinition
66 };
67 
68 struct AuxSymbol {
70  COFF::Auxiliary Aux;
71 };
72 
73 class COFFSection;
74 
75 class COFFSymbol {
76 public:
77  COFF::symbol Data = {};
78 
79  using AuxiliarySymbols = SmallVector<AuxSymbol, 1>;
80 
81  name Name;
82  int Index;
83  AuxiliarySymbols Aux;
84  COFFSymbol *Other = nullptr;
85  COFFSection *Section = nullptr;
86  int Relocations = 0;
87  const MCSymbol *MC = nullptr;
88 
89  COFFSymbol(StringRef Name) : Name(Name) {}
90 
91  void set_name_offset(uint32_t Offset);
92 
93  int64_t getIndex() const { return Index; }
94  void setIndex(int Value) {
95  Index = Value;
96  if (MC)
97  MC->setIndex(static_cast<uint32_t>(Value));
98  }
99 };
100 
101 // This class contains staging data for a COFF relocation entry.
102 struct COFFRelocation {
104  COFFSymbol *Symb = nullptr;
105 
106  COFFRelocation() = default;
107 
108  static size_t size() { return COFF::RelocationSize; }
109 };
110 
111 using relocations = std::vector<COFFRelocation>;
112 
113 class COFFSection {
114 public:
115  COFF::section Header = {};
116 
117  std::string Name;
118  int Number;
119  MCSectionCOFF const *MCSection = nullptr;
120  COFFSymbol *Symbol = nullptr;
121  relocations Relocations;
122 
123  COFFSection(StringRef Name) : Name(Name) {}
124 };
125 
126 class WinCOFFObjectWriter : public MCObjectWriter {
127 public:
128  using symbols = std::vector<std::unique_ptr<COFFSymbol>>;
129  using sections = std::vector<std::unique_ptr<COFFSection>>;
130 
131  using symbol_map = DenseMap<MCSymbol const *, COFFSymbol *>;
132  using section_map = DenseMap<MCSection const *, COFFSection *>;
133 
134  std::unique_ptr<MCWinCOFFObjectTargetWriter> TargetObjectWriter;
135 
136  // Root level file contents.
137  COFF::header Header = {};
138  sections Sections;
139  symbols Symbols;
141 
142  // Maps used during object file creation.
143  section_map SectionMap;
144  symbol_map SymbolMap;
145 
146  bool UseBigObj;
147 
148  WinCOFFObjectWriter(std::unique_ptr<MCWinCOFFObjectTargetWriter> MOTW,
149  raw_pwrite_stream &OS);
150 
151  void reset() override {
152  memset(&Header, 0, sizeof(Header));
153  Header.Machine = TargetObjectWriter->getMachine();
154  Sections.clear();
155  Symbols.clear();
156  Strings.clear();
157  SectionMap.clear();
158  SymbolMap.clear();
160  }
161 
162  COFFSymbol *createSymbol(StringRef Name);
163  COFFSymbol *GetOrCreateCOFFSymbol(const MCSymbol *Symbol);
164  COFFSection *createSection(StringRef Name);
165 
166  void defineSection(MCSectionCOFF const &Sec);
167 
168  COFFSymbol *getLinkedSymbol(const MCSymbol &Symbol);
169  void DefineSymbol(const MCSymbol &Symbol, MCAssembler &Assembler,
170  const MCAsmLayout &Layout);
171 
172  void SetSymbolName(COFFSymbol &S);
173  void SetSectionName(COFFSection &S);
174 
175  bool IsPhysicalSection(COFFSection *S);
176 
177  // Entity writing methods.
178 
179  void WriteFileHeader(const COFF::header &Header);
180  void WriteSymbol(const COFFSymbol &S);
181  void WriteAuxiliarySymbols(const COFFSymbol::AuxiliarySymbols &S);
182  void writeSectionHeaders();
183  void WriteRelocation(const COFF::relocation &R);
184  uint32_t writeSectionContents(MCAssembler &Asm, const MCAsmLayout &Layout,
185  const MCSection &MCSec);
186  void writeSection(MCAssembler &Asm, const MCAsmLayout &Layout,
187  const COFFSection &Sec, const MCSection &MCSec);
188 
189  // MCObjectWriter interface implementation.
190 
191  void executePostLayoutBinding(MCAssembler &Asm,
192  const MCAsmLayout &Layout) override;
193 
194  bool isSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
195  const MCSymbol &SymA,
196  const MCFragment &FB, bool InSet,
197  bool IsPCRel) const override;
198 
199  void recordRelocation(MCAssembler &Asm, const MCAsmLayout &Layout,
200  const MCFragment *Fragment, const MCFixup &Fixup,
201  MCValue Target, uint64_t &FixedValue) override;
202 
203  void createFileSymbols(MCAssembler &Asm);
204  void assignSectionNumbers();
205  void assignFileOffsets(MCAssembler &Asm, const MCAsmLayout &Layout);
206 
207  void writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
208 };
209 
210 } // end anonymous namespace
211 
212 //------------------------------------------------------------------------------
213 // Symbol class implementation
214 
215 // In the case that the name does not fit within 8 bytes, the offset
216 // into the string table is stored in the last 4 bytes instead, leaving
217 // the first 4 bytes as 0.
218 void COFFSymbol::set_name_offset(uint32_t Offset) {
219  write32le(Data.Name + 0, 0);
220  write32le(Data.Name + 4, Offset);
221 }
222 
223 //------------------------------------------------------------------------------
224 // WinCOFFObjectWriter class implementation
225 
226 WinCOFFObjectWriter::WinCOFFObjectWriter(
227  std::unique_ptr<MCWinCOFFObjectTargetWriter> MOTW, raw_pwrite_stream &OS)
228  : MCObjectWriter(OS, true), TargetObjectWriter(std::move(MOTW)) {
229  Header.Machine = TargetObjectWriter->getMachine();
230 }
231 
232 COFFSymbol *WinCOFFObjectWriter::createSymbol(StringRef Name) {
233  Symbols.push_back(make_unique<COFFSymbol>(Name));
234  return Symbols.back().get();
235 }
236 
237 COFFSymbol *WinCOFFObjectWriter::GetOrCreateCOFFSymbol(const MCSymbol *Symbol) {
238  COFFSymbol *&Ret = SymbolMap[Symbol];
239  if (!Ret)
240  Ret = createSymbol(Symbol->getName());
241  return Ret;
242 }
243 
244 COFFSection *WinCOFFObjectWriter::createSection(StringRef Name) {
245  Sections.emplace_back(make_unique<COFFSection>(Name));
246  return Sections.back().get();
247 }
248 
249 static uint32_t getAlignment(const MCSectionCOFF &Sec) {
250  switch (Sec.getAlignment()) {
251  case 1:
253  case 2:
255  case 4:
257  case 8:
259  case 16:
261  case 32:
263  case 64:
265  case 128:
267  case 256:
269  case 512:
271  case 1024:
273  case 2048:
275  case 4096:
277  case 8192:
279  }
280  llvm_unreachable("unsupported section alignment");
281 }
282 
283 /// This function takes a section data object from the assembler
284 /// and creates the associated COFF section staging object.
285 void WinCOFFObjectWriter::defineSection(const MCSectionCOFF &MCSec) {
286  COFFSection *Section = createSection(MCSec.getSectionName());
287  COFFSymbol *Symbol = createSymbol(MCSec.getSectionName());
288  Section->Symbol = Symbol;
289  Symbol->Section = Section;
290  Symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_STATIC;
291 
292  // Create a COMDAT symbol if needed.
294  if (const MCSymbol *S = MCSec.getCOMDATSymbol()) {
295  COFFSymbol *COMDATSymbol = GetOrCreateCOFFSymbol(S);
296  if (COMDATSymbol->Section)
297  report_fatal_error("two sections have the same comdat");
298  COMDATSymbol->Section = Section;
299  }
300  }
301 
302  // In this case the auxiliary symbol is a Section Definition.
303  Symbol->Aux.resize(1);
304  Symbol->Aux[0] = {};
305  Symbol->Aux[0].AuxType = ATSectionDefinition;
306  Symbol->Aux[0].Aux.SectionDefinition.Selection = MCSec.getSelection();
307 
308  // Set section alignment.
309  Section->Header.Characteristics = MCSec.getCharacteristics();
310  Section->Header.Characteristics |= getAlignment(MCSec);
311 
312  // Bind internal COFF section to MC section.
313  Section->MCSection = &MCSec;
314  SectionMap[&MCSec] = Section;
315 }
316 
317 static uint64_t getSymbolValue(const MCSymbol &Symbol,
318  const MCAsmLayout &Layout) {
319  if (Symbol.isCommon() && Symbol.isExternal())
320  return Symbol.getCommonSize();
321 
322  uint64_t Res;
323  if (!Layout.getSymbolOffset(Symbol, Res))
324  return 0;
325 
326  return Res;
327 }
328 
329 COFFSymbol *WinCOFFObjectWriter::getLinkedSymbol(const MCSymbol &Symbol) {
330  if (!Symbol.isVariable())
331  return nullptr;
332 
333  const MCSymbolRefExpr *SymRef =
335  if (!SymRef)
336  return nullptr;
337 
338  const MCSymbol &Aliasee = SymRef->getSymbol();
339  if (!Aliasee.isUndefined())
340  return nullptr;
341  return GetOrCreateCOFFSymbol(&Aliasee);
342 }
343 
344 /// This function takes a symbol data object from the assembler
345 /// and creates the associated COFF symbol staging object.
346 void WinCOFFObjectWriter::DefineSymbol(const MCSymbol &MCSym,
347  MCAssembler &Assembler,
348  const MCAsmLayout &Layout) {
349  COFFSymbol *Sym = GetOrCreateCOFFSymbol(&MCSym);
350  const MCSymbol *Base = Layout.getBaseSymbol(MCSym);
351  COFFSection *Sec = nullptr;
352  if (Base && Base->getFragment()) {
353  Sec = SectionMap[Base->getFragment()->getParent()];
354  if (Sym->Section && Sym->Section != Sec)
355  report_fatal_error("conflicting sections for symbol");
356  }
357 
358  COFFSymbol *Local = nullptr;
359  if (cast<MCSymbolCOFF>(MCSym).isWeakExternal()) {
360  Sym->Data.StorageClass = COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;
361 
362  COFFSymbol *WeakDefault = getLinkedSymbol(MCSym);
363  if (!WeakDefault) {
364  std::string WeakName = (".weak." + MCSym.getName() + ".default").str();
365  WeakDefault = createSymbol(WeakName);
366  if (!Sec)
367  WeakDefault->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
368  else
369  WeakDefault->Section = Sec;
370  Local = WeakDefault;
371  }
372 
373  Sym->Other = WeakDefault;
374 
375  // Setup the Weak External auxiliary symbol.
376  Sym->Aux.resize(1);
377  memset(&Sym->Aux[0], 0, sizeof(Sym->Aux[0]));
378  Sym->Aux[0].AuxType = ATWeakExternal;
379  Sym->Aux[0].Aux.WeakExternal.TagIndex = 0;
380  Sym->Aux[0].Aux.WeakExternal.Characteristics =
382  } else {
383  if (!Base)
384  Sym->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
385  else
386  Sym->Section = Sec;
387  Local = Sym;
388  }
389 
390  if (Local) {
391  Local->Data.Value = getSymbolValue(MCSym, Layout);
392 
393  const MCSymbolCOFF &SymbolCOFF = cast<MCSymbolCOFF>(MCSym);
394  Local->Data.Type = SymbolCOFF.getType();
395  Local->Data.StorageClass = SymbolCOFF.getClass();
396 
397  // If no storage class was specified in the streamer, define it here.
398  if (Local->Data.StorageClass == COFF::IMAGE_SYM_CLASS_NULL) {
399  bool IsExternal = MCSym.isExternal() ||
400  (!MCSym.getFragment() && !MCSym.isVariable());
401 
402  Local->Data.StorageClass = IsExternal ? COFF::IMAGE_SYM_CLASS_EXTERNAL
404  }
405  }
406 
407  Sym->MC = &MCSym;
408 }
409 
410 // Maximum offsets for different string table entry encodings.
411 enum : unsigned { Max7DecimalOffset = 9999999U };
412 enum : uint64_t { MaxBase64Offset = 0xFFFFFFFFFULL }; // 64^6, including 0
413 
414 // Encode a string table entry offset in base 64, padded to 6 chars, and
415 // prefixed with a double slash: '//AAAAAA', '//AAAAAB', ...
416 // Buffer must be at least 8 bytes large. No terminating null appended.
417 static void encodeBase64StringEntry(char *Buffer, uint64_t Value) {
418  assert(Value > Max7DecimalOffset && Value <= MaxBase64Offset &&
419  "Illegal section name encoding for value");
420 
421  static const char Alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
422  "abcdefghijklmnopqrstuvwxyz"
423  "0123456789+/";
424 
425  Buffer[0] = '/';
426  Buffer[1] = '/';
427 
428  char *Ptr = Buffer + 7;
429  for (unsigned i = 0; i < 6; ++i) {
430  unsigned Rem = Value % 64;
431  Value /= 64;
432  *(Ptr--) = Alphabet[Rem];
433  }
434 }
435 
436 void WinCOFFObjectWriter::SetSectionName(COFFSection &S) {
437  if (S.Name.size() <= COFF::NameSize) {
438  std::memcpy(S.Header.Name, S.Name.c_str(), S.Name.size());
439  return;
440  }
441 
442  uint64_t StringTableEntry = Strings.getOffset(S.Name);
443  if (StringTableEntry <= Max7DecimalOffset) {
445  Twine('/').concat(Twine(StringTableEntry)).toVector(Buffer);
446  assert(Buffer.size() <= COFF::NameSize && Buffer.size() >= 2);
447  std::memcpy(S.Header.Name, Buffer.data(), Buffer.size());
448  return;
449  }
450  if (StringTableEntry <= MaxBase64Offset) {
451  // Starting with 10,000,000, offsets are encoded as base64.
452  encodeBase64StringEntry(S.Header.Name, StringTableEntry);
453  return;
454  }
455  report_fatal_error("COFF string table is greater than 64 GB.");
456 }
457 
458 void WinCOFFObjectWriter::SetSymbolName(COFFSymbol &S) {
459  if (S.Name.size() > COFF::NameSize)
460  S.set_name_offset(Strings.getOffset(S.Name));
461  else
462  std::memcpy(S.Data.Name, S.Name.c_str(), S.Name.size());
463 }
464 
465 bool WinCOFFObjectWriter::IsPhysicalSection(COFFSection *S) {
466  return (S->Header.Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) ==
467  0;
468 }
469 
470 //------------------------------------------------------------------------------
471 // entity writing methods
472 
473 void WinCOFFObjectWriter::WriteFileHeader(const COFF::header &Header) {
474  if (UseBigObj) {
476  writeLE16(0xFFFF);
478  writeLE16(Header.Machine);
479  writeLE32(Header.TimeDateStamp);
480  writeBytes(StringRef(COFF::BigObjMagic, sizeof(COFF::BigObjMagic)));
481  writeLE32(0);
482  writeLE32(0);
483  writeLE32(0);
484  writeLE32(0);
485  writeLE32(Header.NumberOfSections);
486  writeLE32(Header.PointerToSymbolTable);
487  writeLE32(Header.NumberOfSymbols);
488  } else {
489  writeLE16(Header.Machine);
490  writeLE16(static_cast<int16_t>(Header.NumberOfSections));
491  writeLE32(Header.TimeDateStamp);
492  writeLE32(Header.PointerToSymbolTable);
493  writeLE32(Header.NumberOfSymbols);
494  writeLE16(Header.SizeOfOptionalHeader);
495  writeLE16(Header.Characteristics);
496  }
497 }
498 
499 void WinCOFFObjectWriter::WriteSymbol(const COFFSymbol &S) {
500  writeBytes(StringRef(S.Data.Name, COFF::NameSize));
501  writeLE32(S.Data.Value);
502  if (UseBigObj)
503  writeLE32(S.Data.SectionNumber);
504  else
505  writeLE16(static_cast<int16_t>(S.Data.SectionNumber));
506  writeLE16(S.Data.Type);
507  write8(S.Data.StorageClass);
508  write8(S.Data.NumberOfAuxSymbols);
509  WriteAuxiliarySymbols(S.Aux);
510 }
511 
512 void WinCOFFObjectWriter::WriteAuxiliarySymbols(
513  const COFFSymbol::AuxiliarySymbols &S) {
514  for (const AuxSymbol &i : S) {
515  switch (i.AuxType) {
516  case ATFunctionDefinition:
517  writeLE32(i.Aux.FunctionDefinition.TagIndex);
518  writeLE32(i.Aux.FunctionDefinition.TotalSize);
519  writeLE32(i.Aux.FunctionDefinition.PointerToLinenumber);
520  writeLE32(i.Aux.FunctionDefinition.PointerToNextFunction);
521  WriteZeros(sizeof(i.Aux.FunctionDefinition.unused));
522  if (UseBigObj)
524  break;
525  case ATbfAndefSymbol:
526  WriteZeros(sizeof(i.Aux.bfAndefSymbol.unused1));
527  writeLE16(i.Aux.bfAndefSymbol.Linenumber);
528  WriteZeros(sizeof(i.Aux.bfAndefSymbol.unused2));
529  writeLE32(i.Aux.bfAndefSymbol.PointerToNextFunction);
530  WriteZeros(sizeof(i.Aux.bfAndefSymbol.unused3));
531  if (UseBigObj)
533  break;
534  case ATWeakExternal:
535  writeLE32(i.Aux.WeakExternal.TagIndex);
536  writeLE32(i.Aux.WeakExternal.Characteristics);
537  WriteZeros(sizeof(i.Aux.WeakExternal.unused));
538  if (UseBigObj)
540  break;
541  case ATFile:
542  writeBytes(
543  StringRef(reinterpret_cast<const char *>(&i.Aux),
544  UseBigObj ? COFF::Symbol32Size : COFF::Symbol16Size));
545  break;
546  case ATSectionDefinition:
547  writeLE32(i.Aux.SectionDefinition.Length);
548  writeLE16(i.Aux.SectionDefinition.NumberOfRelocations);
549  writeLE16(i.Aux.SectionDefinition.NumberOfLinenumbers);
550  writeLE32(i.Aux.SectionDefinition.CheckSum);
551  writeLE16(static_cast<int16_t>(i.Aux.SectionDefinition.Number));
552  write8(i.Aux.SectionDefinition.Selection);
553  WriteZeros(sizeof(i.Aux.SectionDefinition.unused));
554  writeLE16(static_cast<int16_t>(i.Aux.SectionDefinition.Number >> 16));
555  if (UseBigObj)
556  WriteZeros(COFF::Symbol32Size - COFF::Symbol16Size);
557  break;
558  }
559  }
560 }
561 
562 // Write the section header.
563 void WinCOFFObjectWriter::writeSectionHeaders() {
564  // Section numbers must be monotonically increasing in the section
565  // header, but our Sections array is not sorted by section number,
566  // so make a copy of Sections and sort it.
567  std::vector<COFFSection *> Arr;
568  for (auto &Section : Sections)
569  Arr.push_back(Section.get());
570  std::sort(Arr.begin(), Arr.end(),
571  [](const COFFSection *A, const COFFSection *B) {
572  return A->Number < B->Number;
573  });
574 
575  for (auto &Section : Arr) {
576  if (Section->Number == -1)
577  continue;
578 
579  COFF::section &S = Section->Header;
580  if (Section->Relocations.size() >= 0xffff)
582  writeBytes(StringRef(S.Name, COFF::NameSize));
583  writeLE32(S.VirtualSize);
584  writeLE32(S.VirtualAddress);
585  writeLE32(S.SizeOfRawData);
586  writeLE32(S.PointerToRawData);
587  writeLE32(S.PointerToRelocations);
588  writeLE32(S.PointerToLineNumbers);
589  writeLE16(S.NumberOfRelocations);
590  writeLE16(S.NumberOfLineNumbers);
591  writeLE32(S.Characteristics);
592  }
593 }
594 
595 void WinCOFFObjectWriter::WriteRelocation(const COFF::relocation &R) {
596  writeLE32(R.VirtualAddress);
597  writeLE32(R.SymbolTableIndex);
598  writeLE16(R.Type);
599 }
600 
601 // Write MCSec's contents. What this function does is essentially
602 // "Asm.writeSectionData(&MCSec, Layout)", but it's a bit complicated
603 // because it needs to compute a CRC.
604 uint32_t WinCOFFObjectWriter::writeSectionContents(MCAssembler &Asm,
605  const MCAsmLayout &Layout,
606  const MCSection &MCSec) {
607  // Save the contents of the section to a temporary buffer, we need this
608  // to CRC the data before we dump it into the object file.
610  raw_svector_ostream VecOS(Buf);
611  raw_pwrite_stream &OldStream = getStream();
612 
613  // Redirect the output stream to our buffer and fill our buffer with
614  // the section data.
615  setStream(VecOS);
616  Asm.writeSectionData(&MCSec, Layout);
617 
618  // Reset the stream back to what it was before.
619  setStream(OldStream);
620 
621  // Write the section contents to the object file.
622  getStream() << Buf;
623 
624  // Calculate our CRC with an initial value of '0', this is not how
625  // JamCRC is specified but it aligns with the expected output.
626  JamCRC JC(/*Init=*/0);
627  JC.update(Buf);
628  return JC.getCRC();
629 }
630 
631 void WinCOFFObjectWriter::writeSection(MCAssembler &Asm,
632  const MCAsmLayout &Layout,
633  const COFFSection &Sec,
634  const MCSection &MCSec) {
635  if (Sec.Number == -1)
636  return;
637 
638  // Write the section contents.
639  if (Sec.Header.PointerToRawData != 0) {
640  assert(getStream().tell() <= Sec.Header.PointerToRawData &&
641  "Section::PointerToRawData is insane!");
642 
643  unsigned PaddingSize = Sec.Header.PointerToRawData - getStream().tell();
644  assert(PaddingSize < 4 &&
645  "Should only need at most three bytes of padding!");
646  WriteZeros(PaddingSize);
647 
648  uint32_t CRC = writeSectionContents(Asm, Layout, MCSec);
649 
650  // Update the section definition auxiliary symbol to record the CRC.
651  COFFSection *Sec = SectionMap[&MCSec];
652  COFFSymbol::AuxiliarySymbols &AuxSyms = Sec->Symbol->Aux;
653  assert(AuxSyms.size() == 1 && AuxSyms[0].AuxType == ATSectionDefinition);
654  AuxSymbol &SecDef = AuxSyms[0];
655  SecDef.Aux.SectionDefinition.CheckSum = CRC;
656  }
657 
658  // Write relocations for this section.
659  if (Sec.Relocations.empty()) {
660  assert(Sec.Header.PointerToRelocations == 0 &&
661  "Section::PointerToRelocations is insane!");
662  return;
663  }
664 
665  assert(getStream().tell() == Sec.Header.PointerToRelocations &&
666  "Section::PointerToRelocations is insane!");
667 
668  if (Sec.Relocations.size() >= 0xffff) {
669  // In case of overflow, write actual relocation count as first
670  // relocation. Including the synthetic reloc itself (+ 1).
672  R.VirtualAddress = Sec.Relocations.size() + 1;
673  R.SymbolTableIndex = 0;
674  R.Type = 0;
675  WriteRelocation(R);
676  }
677 
678  for (const auto &Relocation : Sec.Relocations)
679  WriteRelocation(Relocation.Data);
680 }
681 
682 ////////////////////////////////////////////////////////////////////////////////
683 // MCObjectWriter interface implementations
684 
685 void WinCOFFObjectWriter::executePostLayoutBinding(MCAssembler &Asm,
686  const MCAsmLayout &Layout) {
687  // "Define" each section & symbol. This creates section & symbol
688  // entries in the staging area.
689  for (const auto &Section : Asm)
690  defineSection(static_cast<const MCSectionCOFF &>(Section));
691 
692  for (const MCSymbol &Symbol : Asm.symbols())
693  if (!Symbol.isTemporary())
694  DefineSymbol(Symbol, Asm, Layout);
695 }
696 
697 bool WinCOFFObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(
698  const MCAssembler &Asm, const MCSymbol &SymA, const MCFragment &FB,
699  bool InSet, bool IsPCRel) const {
700  // MS LINK expects to be able to replace all references to a function with a
701  // thunk to implement their /INCREMENTAL feature. Make sure we don't optimize
702  // away any relocations to functions.
703  uint16_t Type = cast<MCSymbolCOFF>(SymA).getType();
704  if (Asm.isIncrementalLinkerCompatible() &&
706  return false;
708  InSet, IsPCRel);
709 }
710 
711 void WinCOFFObjectWriter::recordRelocation(MCAssembler &Asm,
712  const MCAsmLayout &Layout,
713  const MCFragment *Fragment,
714  const MCFixup &Fixup, MCValue Target,
715  uint64_t &FixedValue) {
716  assert(Target.getSymA() && "Relocation must reference a symbol!");
717 
718  const MCSymbol &A = Target.getSymA()->getSymbol();
719  if (!A.isRegistered()) {
720  Asm.getContext().reportError(Fixup.getLoc(),
721  Twine("symbol '") + A.getName() +
722  "' can not be undefined");
723  return;
724  }
725  if (A.isTemporary() && A.isUndefined()) {
726  Asm.getContext().reportError(Fixup.getLoc(),
727  Twine("assembler label '") + A.getName() +
728  "' can not be undefined");
729  return;
730  }
731 
732  MCSection *MCSec = Fragment->getParent();
733 
734  // Mark this symbol as requiring an entry in the symbol table.
735  assert(SectionMap.find(MCSec) != SectionMap.end() &&
736  "Section must already have been defined in executePostLayoutBinding!");
737 
738  COFFSection *Sec = SectionMap[MCSec];
739  const MCSymbolRefExpr *SymB = Target.getSymB();
740 
741  if (SymB) {
742  const MCSymbol *B = &SymB->getSymbol();
743  if (!B->getFragment()) {
744  Asm.getContext().reportError(
745  Fixup.getLoc(),
746  Twine("symbol '") + B->getName() +
747  "' can not be undefined in a subtraction expression");
748  return;
749  }
750 
751  // Offset of the symbol in the section
752  int64_t OffsetOfB = Layout.getSymbolOffset(*B);
753 
754  // Offset of the relocation in the section
755  int64_t OffsetOfRelocation =
756  Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
757 
758  FixedValue = (OffsetOfRelocation - OffsetOfB) + Target.getConstant();
759  } else {
760  FixedValue = Target.getConstant();
761  }
762 
763  COFFRelocation Reloc;
764 
765  Reloc.Data.SymbolTableIndex = 0;
766  Reloc.Data.VirtualAddress = Layout.getFragmentOffset(Fragment);
767 
768  // Turn relocations for temporary symbols into section relocations.
769  if (A.isTemporary()) {
770  MCSection *TargetSection = &A.getSection();
771  assert(
772  SectionMap.find(TargetSection) != SectionMap.end() &&
773  "Section must already have been defined in executePostLayoutBinding!");
774  Reloc.Symb = SectionMap[TargetSection]->Symbol;
775  FixedValue += Layout.getSymbolOffset(A);
776  } else {
777  assert(
778  SymbolMap.find(&A) != SymbolMap.end() &&
779  "Symbol must already have been defined in executePostLayoutBinding!");
780  Reloc.Symb = SymbolMap[&A];
781  }
782 
783  ++Reloc.Symb->Relocations;
784 
785  Reloc.Data.VirtualAddress += Fixup.getOffset();
786  Reloc.Data.Type = TargetObjectWriter->getRelocType(
787  Asm.getContext(), Target, Fixup, SymB, Asm.getBackend());
788 
789  // FIXME: Can anyone explain what this does other than adjust for the size
790  // of the offset?
791  if ((Header.Machine == COFF::IMAGE_FILE_MACHINE_AMD64 &&
792  Reloc.Data.Type == COFF::IMAGE_REL_AMD64_REL32) ||
794  Reloc.Data.Type == COFF::IMAGE_REL_I386_REL32))
795  FixedValue += 4;
796 
797  if (Header.Machine == COFF::IMAGE_FILE_MACHINE_ARMNT) {
798  switch (Reloc.Data.Type) {
805  break;
808  // IMAGE_REL_ARM_BRANCH11 and IMAGE_REL_ARM_BLX11 are only used for
809  // pre-ARMv7, which implicitly rules it out of ARMNT (it would be valid
810  // for Windows CE).
814  // IMAGE_REL_ARM_BRANCH24, IMAGE_REL_ARM_BLX24, IMAGE_REL_ARM_MOV32A are
815  // only used for ARM mode code, which is documented as being unsupported
816  // by Windows on ARM. Empirical proof indicates that masm is able to
817  // generate the relocations however the rest of the MSVC toolchain is
818  // unable to handle it.
819  llvm_unreachable("unsupported relocation");
820  break;
822  break;
826  // IMAGE_REL_BRANCH20T, IMAGE_REL_ARM_BRANCH24T, IMAGE_REL_ARM_BLX23T all
827  // perform a 4 byte adjustment to the relocation. Relative branches are
828  // offset by 4 on ARM, however, because there is no RELA relocations, all
829  // branches are offset by 4.
830  FixedValue = FixedValue + 4;
831  break;
832  }
833  }
834 
835  // The fixed value never makes sense for section indices, ignore it.
836  if (Fixup.getKind() == FK_SecRel_2)
837  FixedValue = 0;
838 
839  if (TargetObjectWriter->recordRelocation(Fixup))
840  Sec->Relocations.push_back(Reloc);
841 }
842 
843 static std::time_t getTime() {
844  std::time_t Now = time(nullptr);
845  if (Now < 0 || !isUInt<32>(Now))
846  return UINT32_MAX;
847  return Now;
848 }
849 
850 // Create .file symbols.
851 void WinCOFFObjectWriter::createFileSymbols(MCAssembler &Asm) {
852  for (const std::string &Name : Asm.getFileNames()) {
853  // round up to calculate the number of auxiliary symbols required
854  unsigned SymbolSize = UseBigObj ? COFF::Symbol32Size : COFF::Symbol16Size;
855  unsigned Count = (Name.size() + SymbolSize - 1) / SymbolSize;
856 
857  COFFSymbol *File = createSymbol(".file");
858  File->Data.SectionNumber = COFF::IMAGE_SYM_DEBUG;
859  File->Data.StorageClass = COFF::IMAGE_SYM_CLASS_FILE;
860  File->Aux.resize(Count);
861 
862  unsigned Offset = 0;
863  unsigned Length = Name.size();
864  for (auto &Aux : File->Aux) {
865  Aux.AuxType = ATFile;
866 
867  if (Length > SymbolSize) {
868  memcpy(&Aux.Aux, Name.c_str() + Offset, SymbolSize);
869  Length = Length - SymbolSize;
870  } else {
871  memcpy(&Aux.Aux, Name.c_str() + Offset, Length);
872  memset((char *)&Aux.Aux + Length, 0, SymbolSize - Length);
873  break;
874  }
875 
876  Offset += SymbolSize;
877  }
878  }
879 }
880 
881 static bool isAssociative(const COFFSection &Section) {
882  return Section.Symbol->Aux[0].Aux.SectionDefinition.Selection ==
884 }
885 
886 void WinCOFFObjectWriter::assignSectionNumbers() {
887  size_t I = 1;
888  auto Assign = [&](COFFSection &Section) {
889  Section.Number = I;
890  Section.Symbol->Data.SectionNumber = I;
891  Section.Symbol->Aux[0].Aux.SectionDefinition.Number = I;
892  ++I;
893  };
894 
895  // Although it is not explicitly requested by the Microsoft COFF spec,
896  // we should avoid emitting forward associative section references,
897  // because MSVC link.exe as of 2017 cannot handle that.
898  for (const std::unique_ptr<COFFSection> &Section : Sections)
899  if (!isAssociative(*Section))
900  Assign(*Section);
901  for (const std::unique_ptr<COFFSection> &Section : Sections)
902  if (isAssociative(*Section))
903  Assign(*Section);
904 }
905 
906 // Assign file offsets to COFF object file structures.
907 void WinCOFFObjectWriter::assignFileOffsets(MCAssembler &Asm,
908  const MCAsmLayout &Layout) {
909  unsigned Offset = getInitialOffset();
910 
911  Offset += UseBigObj ? COFF::Header32Size : COFF::Header16Size;
912  Offset += COFF::SectionSize * Header.NumberOfSections;
913 
914  for (const auto &Section : Asm) {
915  COFFSection *Sec = SectionMap[&Section];
916 
917  if (Sec->Number == -1)
918  continue;
919 
920  Sec->Header.SizeOfRawData = Layout.getSectionAddressSize(&Section);
921 
922  if (IsPhysicalSection(Sec)) {
923  // Align the section data to a four byte boundary.
924  Offset = alignTo(Offset, 4);
925  Sec->Header.PointerToRawData = Offset;
926 
927  Offset += Sec->Header.SizeOfRawData;
928  }
929 
930  if (!Sec->Relocations.empty()) {
931  bool RelocationsOverflow = Sec->Relocations.size() >= 0xffff;
932 
933  if (RelocationsOverflow) {
934  // Signal overflow by setting NumberOfRelocations to max value. Actual
935  // size is found in reloc #0. Microsoft tools understand this.
936  Sec->Header.NumberOfRelocations = 0xffff;
937  } else {
938  Sec->Header.NumberOfRelocations = Sec->Relocations.size();
939  }
940  Sec->Header.PointerToRelocations = Offset;
941 
942  if (RelocationsOverflow) {
943  // Reloc #0 will contain actual count, so make room for it.
944  Offset += COFF::RelocationSize;
945  }
946 
947  Offset += COFF::RelocationSize * Sec->Relocations.size();
948 
949  for (auto &Relocation : Sec->Relocations) {
950  assert(Relocation.Symb->getIndex() != -1);
951  Relocation.Data.SymbolTableIndex = Relocation.Symb->getIndex();
952  }
953  }
954 
955  assert(Sec->Symbol->Aux.size() == 1 &&
956  "Section's symbol must have one aux!");
957  AuxSymbol &Aux = Sec->Symbol->Aux[0];
958  assert(Aux.AuxType == ATSectionDefinition &&
959  "Section's symbol's aux symbol must be a Section Definition!");
960  Aux.Aux.SectionDefinition.Length = Sec->Header.SizeOfRawData;
961  Aux.Aux.SectionDefinition.NumberOfRelocations =
962  Sec->Header.NumberOfRelocations;
963  Aux.Aux.SectionDefinition.NumberOfLinenumbers =
964  Sec->Header.NumberOfLineNumbers;
965  }
966 
967  Header.PointerToSymbolTable = Offset;
968 }
969 
970 void WinCOFFObjectWriter::writeObject(MCAssembler &Asm,
971  const MCAsmLayout &Layout) {
972  if (Sections.size() > INT32_MAX)
974  "PE COFF object files can't have more than 2147483647 sections");
975 
976  UseBigObj = Sections.size() > COFF::MaxNumberOfSections16;
977  Header.NumberOfSections = Sections.size();
978  Header.NumberOfSymbols = 0;
979 
980  assignSectionNumbers();
981  createFileSymbols(Asm);
982 
983  for (auto &Symbol : Symbols) {
984  // Update section number & offset for symbols that have them.
985  if (Symbol->Section)
986  Symbol->Data.SectionNumber = Symbol->Section->Number;
987  Symbol->setIndex(Header.NumberOfSymbols++);
988  // Update auxiliary symbol info.
989  Symbol->Data.NumberOfAuxSymbols = Symbol->Aux.size();
990  Header.NumberOfSymbols += Symbol->Data.NumberOfAuxSymbols;
991  }
992 
993  // Build string table.
994  for (const auto &S : Sections)
995  if (S->Name.size() > COFF::NameSize)
996  Strings.add(S->Name);
997  for (const auto &S : Symbols)
998  if (S->Name.size() > COFF::NameSize)
999  Strings.add(S->Name);
1000  Strings.finalize();
1001 
1002  // Set names.
1003  for (const auto &S : Sections)
1004  SetSectionName(*S);
1005  for (auto &S : Symbols)
1006  SetSymbolName(*S);
1007 
1008  // Fixup weak external references.
1009  for (auto &Symbol : Symbols) {
1010  if (Symbol->Other) {
1011  assert(Symbol->getIndex() != -1);
1012  assert(Symbol->Aux.size() == 1 && "Symbol must contain one aux symbol!");
1013  assert(Symbol->Aux[0].AuxType == ATWeakExternal &&
1014  "Symbol's aux symbol must be a Weak External!");
1015  Symbol->Aux[0].Aux.WeakExternal.TagIndex = Symbol->Other->getIndex();
1016  }
1017  }
1018 
1019  // Fixup associative COMDAT sections.
1020  for (auto &Section : Sections) {
1021  if (Section->Symbol->Aux[0].Aux.SectionDefinition.Selection !=
1023  continue;
1024 
1025  const MCSectionCOFF &MCSec = *Section->MCSection;
1026 
1027  const MCSymbol *COMDAT = MCSec.getCOMDATSymbol();
1028  assert(COMDAT);
1029  COFFSymbol *COMDATSymbol = GetOrCreateCOFFSymbol(COMDAT);
1030  assert(COMDATSymbol);
1031  COFFSection *Assoc = COMDATSymbol->Section;
1032  if (!Assoc)
1034  Twine("Missing associated COMDAT section for section ") +
1035  MCSec.getSectionName());
1036 
1037  // Skip this section if the associated section is unused.
1038  if (Assoc->Number == -1)
1039  continue;
1040 
1041  Section->Symbol->Aux[0].Aux.SectionDefinition.Number = Assoc->Number;
1042  }
1043 
1044  assignFileOffsets(Asm, Layout);
1045 
1046  // MS LINK expects to be able to use this timestamp to implement their
1047  // /INCREMENTAL feature.
1048  if (Asm.isIncrementalLinkerCompatible()) {
1049  Header.TimeDateStamp = getTime();
1050  } else {
1051  // Have deterministic output if /INCREMENTAL isn't needed. Also matches GNU.
1052  Header.TimeDateStamp = 0;
1053  }
1054 
1055  // Write it all to disk...
1056  WriteFileHeader(Header);
1057  writeSectionHeaders();
1058 
1059  // Write section contents.
1060  sections::iterator I = Sections.begin();
1061  sections::iterator IE = Sections.end();
1062  MCAssembler::iterator J = Asm.begin();
1063  MCAssembler::iterator JE = Asm.end();
1064  for (; I != IE && J != JE; ++I, ++J)
1065  writeSection(Asm, Layout, **I, *J);
1066 
1067  assert(getStream().tell() == Header.PointerToSymbolTable &&
1068  "Header::PointerToSymbolTable is insane!");
1069 
1070  // Write a symbol table.
1071  for (auto &Symbol : Symbols)
1072  if (Symbol->getIndex() != -1)
1073  WriteSymbol(*Symbol);
1074 
1075  // Write a string table, which completes the entire COFF file.
1076  Strings.write(getStream());
1077 }
1078 
1080  : Machine(Machine_) {}
1081 
1082 // Pin the vtable to this file.
1083 void MCWinCOFFObjectTargetWriter::anchor() {}
1084 
1085 //------------------------------------------------------------------------------
1086 // WinCOFFObjectWriter factory function
1087 
1088 std::unique_ptr<MCObjectWriter> llvm::createWinCOFFObjectWriter(
1089  std::unique_ptr<MCWinCOFFObjectTargetWriter> MOTW, raw_pwrite_stream &OS) {
1090  return llvm::make_unique<WinCOFFObjectWriter>(std::move(MOTW), OS);
1091 }
constexpr bool isUInt< 32 >(uint64_t x)
Definition: MathExtras.h:341
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:311
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:115
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
bool isVariable() const
isVariable - Check if this is a variable symbol.
Definition: MCSymbol.h:295
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:175
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:42
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:136
uint32_t SizeOfRawData
Definition: COFF.h:272
iterator begin()
Definition: MCAssembler.h:305
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:269
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:489
void write32le(void *P, uint32_t V)
Definition: Endian.h:404
uint64_t alignTo(uint64_t Value, uint64_t Align, uint64_t Skew=0)
Returns the next integer (mod 2**64) that is greater than or equal to Value and is a multiple of Alig...
Definition: MathExtras.h:677
bool isCommon() const
Is this a &#39;common&#39; symbol.
Definition: MCSymbol.h:379
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
Encode information on a single operation to perform on a byte sequence (e.g., an encoded instruction)...
Definition: MCFixup.h:66
unsigned getAlignment() const
Definition: MCSection.h:117
This represents a section on Windows.
Definition: MCSectionCOFF.h:27
MCContext & getContext() const
Definition: MCAssembler.h:259
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
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
uint32_t PointerToSymbolTable
Definition: COFF.h:70
Represent a reference to a symbol from inside an expression.
Definition: MCExpr.h:165
const int32_t MaxNumberOfSections16
Definition: COFF.h:34
ELFYAML::ELF_STO Other
Definition: ELFYAML.cpp:736
void writeSectionData(const MCSection *Section, const MCAsmLayout &Layout) const
Emit the section contents using the given object writer.
ArrayRef< std::string > getFileNames()
Definition: MCAssembler.h:404
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
iterator end()
Definition: MCAssembler.h:308
uint16_t SizeOfOptionalHeader
Definition: COFF.h:72
uint32_t SymbolTableIndex
Definition: COFF.h:324
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
Type is formed as (base + (derived << SCT_COMPLEX_TYPE_SHIFT))
Definition: COFF.h:263
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:129
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:335
void reportError(SMLoc L, const Twine &Msg)
Definition: MCContext.cpp:570
A function that returns a base type.
Definition: COFF.h:259
uint32_t getOffset() const
Definition: MCFixup.h:95
void toVector(SmallVectorImpl< char > &Out) const
Append the concatenated string into the given SmallString or SmallVector.
Definition: Twine.cpp:32
bool isExternal() const
Definition: MCSymbol.h:392
StringRef getSectionName() const
Definition: MCSectionCOFF.h:72
static wasm::ValType getType(const TargetRegisterClass *RC)
uint16_t NumberOfLineNumbers
Definition: COFF.h:277
uint32_t VirtualAddress
Definition: COFF.h:271
#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:77
PowerPC TLS Dynamic Call Fixup
SMLoc getLoc() const
Definition: MCFixup.h:112
COFFYAML::AuxSymbolType AuxType
Definition: COFFYAML.cpp:345
uint32_t PointerToRelocations
Definition: COFF.h:274
MCAsmBackend & getBackend() const
Definition: MCAssembler.h:261
MCSymbol * getCOMDATSymbol() const
Definition: MCSectionCOFF.h:74
const MCSymbol & getSymbol() const
Definition: MCExpr.h:318
bool isUndefined(bool SetUsed=true) const
isUndefined - Check if this symbol undefined (i.e., implicitly defined).
Definition: MCSymbol.h:260
MCFragment * getFragment(bool SetUsed=true) const
Definition: MCSymbol.h:383
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:864
An iterator type that allows iterating over the pointees via some other iterator. ...
Definition: iterator.h:289
uint32_t PointerToRawData
Definition: COFF.h:273
uint32_t VirtualSize
Definition: COFF.h:270
Target - Wrapper for Target specific information.
MCSection * getParent() const
Definition: MCFragment.h:104
int getSelection() const
Definition: MCSectionCOFF.h:75
uint32_t NumberOfSymbols
Definition: COFF.h:71
virtual bool isSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm, const MCSymbol &A, const MCSymbol &B, bool InSet) const
pointer data()
Return a pointer to the vector&#39;s buffer, even if empty().
Definition: SmallVector.h:143
int32_t NumberOfSections
Definition: COFF.h:68
#define I(x, y, z)
Definition: MD5.cpp:58
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:337
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
uint16_t NumberOfRelocations
Definition: COFF.h:276
bool isIncrementalLinkerCompatible() const
Definition: MCAssembler.h:282
const MCExpr * getVariableValue(bool SetUsed=true) const
getVariableValue - Get the value for variable symbols.
Definition: MCSymbol.h:300
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:275
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
uint16_t getType() const
Definition: MCSymbolCOFF.h:34
void sort(Policy policy, RandomAccessIterator Start, RandomAccessIterator End, const Comparator &Comp=Comparator())
Definition: Parallel.h:199
static bool isAssociative(const COFFSection &Section)
uint32_t Characteristics
Definition: COFF.h:278
void setIndex(uint32_t Value) const
Set the (implementation defined) index.
Definition: MCSymbol.h:316
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:139
uint32_t VirtualAddress
Definition: COFF.h:323