lib/MC/MCAsmStreamer.cpp

   1 //===- lib/MC/MCAsmStreamer.cpp - Text Assembly Output ----------*- C++ -*-===//
   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 #include "llvm/ADT/Optional.h"
  10 #include "llvm/ADT/STLExtras.h"
  11 #include "llvm/ADT/SmallString.h"
  12 #include "llvm/ADT/StringExtras.h"
  13 #include "llvm/ADT/Twine.h"
  14 #include "llvm/DebugInfo/CodeView/SymbolRecord.h"
  15 #include "llvm/MC/MCAsmBackend.h"
  16 #include "llvm/MC/MCAsmInfo.h"
  17 #include "llvm/MC/MCAssembler.h"
  18 #include "llvm/MC/MCCodeEmitter.h"
  19 #include "llvm/MC/MCCodeView.h"
  20 #include "llvm/MC/MCContext.h"
  21 #include "llvm/MC/MCExpr.h"
  22 #include "llvm/MC/MCFixupKindInfo.h"
  23 #include "llvm/MC/MCInst.h"
  24 #include "llvm/MC/MCInstPrinter.h"
  25 #include "llvm/MC/MCObjectFileInfo.h"
  26 #include "llvm/MC/MCObjectWriter.h"
  27 #include "llvm/MC/MCRegister.h"
  28 #include "llvm/MC/MCRegisterInfo.h"
  29 #include "llvm/MC/MCSectionMachO.h"
  30 #include "llvm/MC/MCStreamer.h"
  31 #include "llvm/Support/ErrorHandling.h"
  32 #include "llvm/Support/Format.h"
  33 #include "llvm/Support/FormattedStream.h"
  34 #include "llvm/Support/LEB128.h"
  35 #include "llvm/Support/MathExtras.h"
  36 #include "llvm/Support/Path.h"
  37 #include "llvm/Support/TargetRegistry.h"
  38 #include <cctype>
  39
  40 using namespace llvm;
  41
  42 namespace {
  43
  44 class MCAsmStreamer final : public MCStreamer {
  45   std::unique_ptr<formatted_raw_ostream> OSOwner;
  46   formatted_raw_ostream &OS;
  47   const MCAsmInfo *MAI;
  48   std::unique_ptr<MCInstPrinter> InstPrinter;
  49   std::unique_ptr<MCAssembler> Assembler;
  50
  51   SmallString<128> ExplicitCommentToEmit;
  52   SmallString<128> CommentToEmit;
  53   raw_svector_ostream CommentStream;
  54   raw_null_ostream NullStream;
  55
  56   unsigned IsVerboseAsm : 1;
  57   unsigned ShowInst : 1;
  58   unsigned UseDwarfDirectory : 1;
  59
  60   void EmitRegisterName(int64_t Register);
  61   void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) override;
  62   void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override;
  63
  64 public:
  65   MCAsmStreamer(MCContext &Context, std::unique_ptr<formatted_raw_ostream> os,
  66                 bool isVerboseAsm, bool useDwarfDirectory,
  67                 MCInstPrinter *printer, std::unique_ptr<MCCodeEmitter> emitter,
  68                 std::unique_ptr<MCAsmBackend> asmbackend, bool showInst)
  69       : MCStreamer(Context), OSOwner(std::move(os)), OS(*OSOwner),
  70         MAI(Context.getAsmInfo()), InstPrinter(printer),
  71         Assembler(std::make_unique<MCAssembler>(
  72             Context, std::move(asmbackend), std::move(emitter),
  73             (asmbackend) ? asmbackend->createObjectWriter(NullStream)
  74                          : nullptr)),
  75         CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
  76         ShowInst(showInst), UseDwarfDirectory(useDwarfDirectory) {
  77     assert(InstPrinter);
  78     if (IsVerboseAsm)
  79         InstPrinter->setCommentStream(CommentStream);
  80   }
  81
  82   MCAssembler &getAssembler() { return *Assembler; }
  83   MCAssembler *getAssemblerPtr() override { return nullptr; }
  84
  85   inline void EmitEOL() {
  86     // Dump Explicit Comments here.
  87     emitExplicitComments();
  88     // If we don't have any comments, just emit a \n.
  89     if (!IsVerboseAsm) {
  90       OS << '\n';
  91       return;
  92     }
  93     EmitCommentsAndEOL();
  94   }
  95
  96   void EmitSyntaxDirective() override;
  97
  98   void EmitCommentsAndEOL();
  99
 100   /// Return true if this streamer supports verbose assembly at all.
 101   bool isVerboseAsm() const override { return IsVerboseAsm; }
 102
 103   /// Do we support EmitRawText?
 104   bool hasRawTextSupport() const override { return true; }
 105
 106   /// Add a comment that can be emitted to the generated .s file to make the
 107   /// output of the compiler more readable. This only affects the MCAsmStreamer
 108   /// and only when verbose assembly output is enabled.
 109   void AddComment(const Twine &T, bool EOL = true) override;
 110
 111   /// Add a comment showing the encoding of an instruction.
 112   void AddEncodingComment(const MCInst &Inst, const MCSubtargetInfo &);
 113
 114   /// Return a raw_ostream that comments can be written to.
 115   /// Unlike AddComment, you are required to terminate comments with \n if you
 116   /// use this method.
 117   raw_ostream &GetCommentOS() override {
 118     if (!IsVerboseAsm)
 119       return nulls();  // Discard comments unless in verbose asm mode.
 120     return CommentStream;
 121   }
 122
 123   void emitRawComment(const Twine &T, bool TabPrefix = true) override;
 124
 125   void addExplicitComment(const Twine &T) override;
 126   void emitExplicitComments() override;
 127
 128   /// Emit a blank line to a .s file to pretty it up.
 129   void AddBlankLine() override {
 130     EmitEOL();
 131   }
 132
 133   /// @name MCStreamer Interface
 134   /// @{
 135
 136   void ChangeSection(MCSection *Section, const MCExpr *Subsection) override;
 137
 138   void emitELFSymverDirective(StringRef AliasName,
 139                               const MCSymbol *Aliasee) override;
 140
 141   void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override;
 142   void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
 143
 144   void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
 145   void EmitLinkerOptions(ArrayRef<std::string> Options) override;
 146   void EmitDataRegion(MCDataRegionType Kind) override;
 147   void EmitVersionMin(MCVersionMinType Kind, unsigned Major, unsigned Minor,
 148                       unsigned Update, VersionTuple SDKVersion) override;
 149   void EmitBuildVersion(unsigned Platform, unsigned Major, unsigned Minor,
 150                         unsigned Update, VersionTuple SDKVersion) override;
 151   void EmitThumbFunc(MCSymbol *Func) override;
 152
 153   void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
 154   void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
 155   bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
 156
 157   void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
 158   void BeginCOFFSymbolDef(const MCSymbol *Symbol) override;
 159   void EmitCOFFSymbolStorageClass(int StorageClass) override;
 160   void EmitCOFFSymbolType(int Type) override;
 161   void EndCOFFSymbolDef() override;
 162   void EmitCOFFSafeSEH(MCSymbol const *Symbol) override;
 163   void EmitCOFFSymbolIndex(MCSymbol const *Symbol) override;
 164   void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
 165   void EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) override;
 166   void EmitCOFFImgRel32(MCSymbol const *Symbol, int64_t Offset) override;
 167   void EmitXCOFFLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
 168                                   unsigned ByteAlign) override;
 169   void emitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
 170   void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
 171                         unsigned ByteAlignment) override;
 172
 173   /// Emit a local common (.lcomm) symbol.
 174   ///
 175   /// @param Symbol - The common symbol to emit.
 176   /// @param Size - The size of the common symbol.
 177   /// @param ByteAlignment - The alignment of the common symbol in bytes.
 178   void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
 179                              unsigned ByteAlignment) override;
 180
 181   void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
 182                     uint64_t Size = 0, unsigned ByteAlignment = 0,
 183                     SMLoc Loc = SMLoc()) override;
 184
 185   void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
 186                       unsigned ByteAlignment = 0) override;
 187
 188   void EmitBinaryData(StringRef Data) override;
 189
 190   void EmitBytes(StringRef Data) override;
 191
 192   void EmitValueImpl(const MCExpr *Value, unsigned Size,
 193                      SMLoc Loc = SMLoc()) override;
 194   void EmitIntValue(uint64_t Value, unsigned Size) override;
 195   void EmitIntValueInHex(uint64_t Value, unsigned Size) override;
 196
 197   void EmitULEB128Value(const MCExpr *Value) override;
 198
 199   void EmitSLEB128Value(const MCExpr *Value) override;
 200
 201   void EmitDTPRel32Value(const MCExpr *Value) override;
 202   void EmitDTPRel64Value(const MCExpr *Value) override;
 203   void EmitTPRel32Value(const MCExpr *Value) override;
 204   void EmitTPRel64Value(const MCExpr *Value) override;
 205
 206   void EmitGPRel64Value(const MCExpr *Value) override;
 207
 208   void EmitGPRel32Value(const MCExpr *Value) override;
 209
 210   void emitFill(const MCExpr &NumBytes, uint64_t FillValue,
 211                 SMLoc Loc = SMLoc()) override;
 212
 213   void emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
 214                 SMLoc Loc = SMLoc()) override;
 215
 216   void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
 217                             unsigned ValueSize = 1,
 218                             unsigned MaxBytesToEmit = 0) override;
 219
 220   void EmitCodeAlignment(unsigned ByteAlignment,
 221                          unsigned MaxBytesToEmit = 0) override;
 222
 223   void emitValueToOffset(const MCExpr *Offset,
 224                          unsigned char Value,
 225                          SMLoc Loc) override;
 226
 227   void EmitFileDirective(StringRef Filename) override;
 228   Expected<unsigned> tryEmitDwarfFileDirective(unsigned FileNo,
 229                                                StringRef Directory,
 230                                                StringRef Filename,
 231                                                Optional<MD5::MD5Result> Checksum = None,
 232                                                Optional<StringRef> Source = None,
 233                                                unsigned CUID = 0) override;
 234   void emitDwarfFile0Directive(StringRef Directory, StringRef Filename,
 235                                Optional<MD5::MD5Result> Checksum,
 236                                Optional<StringRef> Source,
 237                                unsigned CUID = 0) override;
 238   void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
 239                              unsigned Column, unsigned Flags,
 240                              unsigned Isa, unsigned Discriminator,
 241                              StringRef FileName) override;
 242   MCSymbol *getDwarfLineTableSymbol(unsigned CUID) override;
 243
 244   bool EmitCVFileDirective(unsigned FileNo, StringRef Filename,
 245                            ArrayRef<uint8_t> Checksum,
 246                            unsigned ChecksumKind) override;
 247   bool EmitCVFuncIdDirective(unsigned FuncId) override;
 248   bool EmitCVInlineSiteIdDirective(unsigned FunctionId, unsigned IAFunc,
 249                                    unsigned IAFile, unsigned IALine,
 250                                    unsigned IACol, SMLoc Loc) override;
 251   void EmitCVLocDirective(unsigned FunctionId, unsigned FileNo, unsigned Line,
 252                           unsigned Column, bool PrologueEnd, bool IsStmt,
 253                           StringRef FileName, SMLoc Loc) override;
 254   void EmitCVLinetableDirective(unsigned FunctionId, const MCSymbol *FnStart,
 255                                 const MCSymbol *FnEnd) override;
 256   void EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
 257                                       unsigned SourceFileId,
 258                                       unsigned SourceLineNum,
 259                                       const MCSymbol *FnStartSym,
 260                                       const MCSymbol *FnEndSym) override;
 261
 262   void PrintCVDefRangePrefix(
 263       ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges);
 264
 265   void EmitCVDefRangeDirective(
 266       ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
 267       codeview::DefRangeRegisterRelHeader DRHdr) override;
 268
 269   void EmitCVDefRangeDirective(
 270       ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
 271       codeview::DefRangeSubfieldRegisterHeader DRHdr) override;
 272
 273   void EmitCVDefRangeDirective(
 274       ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
 275       codeview::DefRangeRegisterHeader DRHdr) override;
 276
 277   void EmitCVDefRangeDirective(
 278       ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
 279       codeview::DefRangeFramePointerRelHeader DRHdr) override;
 280
 281   void EmitCVStringTableDirective() override;
 282   void EmitCVFileChecksumsDirective() override;
 283   void EmitCVFileChecksumOffsetDirective(unsigned FileNo) override;
 284   void EmitCVFPOData(const MCSymbol *ProcSym, SMLoc L) override;
 285
 286   void EmitIdent(StringRef IdentString) override;
 287   void EmitCFIBKeyFrame() override;
 288   void EmitCFISections(bool EH, bool Debug) override;
 289   void EmitCFIDefCfa(int64_t Register, int64_t Offset) override;
 290   void EmitCFIDefCfaOffset(int64_t Offset) override;
 291   void EmitCFIDefCfaRegister(int64_t Register) override;
 292   void EmitCFIOffset(int64_t Register, int64_t Offset) override;
 293   void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding) override;
 294   void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) override;
 295   void EmitCFIRememberState() override;
 296   void EmitCFIRestoreState() override;
 297   void EmitCFIRestore(int64_t Register) override;
 298   void EmitCFISameValue(int64_t Register) override;
 299   void EmitCFIRelOffset(int64_t Register, int64_t Offset) override;
 300   void EmitCFIAdjustCfaOffset(int64_t Adjustment) override;
 301   void EmitCFIEscape(StringRef Values) override;
 302   void EmitCFIGnuArgsSize(int64_t Size) override;
 303   void EmitCFISignalFrame() override;
 304   void EmitCFIUndefined(int64_t Register) override;
 305   void EmitCFIRegister(int64_t Register1, int64_t Register2) override;
 306   void EmitCFIWindowSave() override;
 307   void EmitCFINegateRAState() override;
 308   void EmitCFIReturnColumn(int64_t Register) override;
 309
 310   void EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc) override;
 311   void EmitWinCFIEndProc(SMLoc Loc) override;
 312   void EmitWinCFIFuncletOrFuncEnd(SMLoc Loc) override;
 313   void EmitWinCFIStartChained(SMLoc Loc) override;
 314   void EmitWinCFIEndChained(SMLoc Loc) override;
 315   void EmitWinCFIPushReg(MCRegister Register, SMLoc Loc) override;
 316   void EmitWinCFISetFrame(MCRegister Register, unsigned Offset,
 317                           SMLoc Loc) override;
 318   void EmitWinCFIAllocStack(unsigned Size, SMLoc Loc) override;
 319   void EmitWinCFISaveReg(MCRegister Register, unsigned Offset,
 320                          SMLoc Loc) override;
 321   void EmitWinCFISaveXMM(MCRegister Register, unsigned Offset,
 322                          SMLoc Loc) override;
 323   void EmitWinCFIPushFrame(bool Code, SMLoc Loc) override;
 324   void EmitWinCFIEndProlog(SMLoc Loc) override;
 325
 326   void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except,
 327                         SMLoc Loc) override;
 328   void EmitWinEHHandlerData(SMLoc Loc) override;
 329
 330   void emitCGProfileEntry(const MCSymbolRefExpr *From,
 331                           const MCSymbolRefExpr *To, uint64_t Count) override;
 332
 333   void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
 334
 335   void EmitBundleAlignMode(unsigned AlignPow2) override;
 336   void EmitBundleLock(bool AlignToEnd) override;
 337   void EmitBundleUnlock() override;
 338
 339   bool EmitRelocDirective(const MCExpr &Offset, StringRef Name,
 340                           const MCExpr *Expr, SMLoc Loc,
 341                           const MCSubtargetInfo &STI) override;
 342
 343   void EmitAddrsig() override;
 344   void EmitAddrsigSym(const MCSymbol *Sym) override;
 345
 346   /// If this file is backed by an assembly streamer, this dumps the specified
 347   /// string in the output .s file. This capability is indicated by the
 348   /// hasRawTextSupport() predicate.
 349   void EmitRawTextImpl(StringRef String) override;
 350
 351   void FinishImpl() override;
 352 };
 353
 354 } // end anonymous namespace.
 355
 356 void MCAsmStreamer::AddComment(const Twine &T, bool EOL) {
 357   if (!IsVerboseAsm) return;
 358
 359   T.toVector(CommentToEmit);
 360
 361   if (EOL)
 362     CommentToEmit.push_back('\n'); // Place comment in a new line.
 363 }
 364
 365 void MCAsmStreamer::EmitCommentsAndEOL() {
 366   if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
 367     OS << '\n';
 368     return;
 369   }
 370
 371   StringRef Comments = CommentToEmit;
 372
 373   assert(Comments.back() == '\n' &&
 374          "Comment array not newline terminated");
 375   do {
 376     // Emit a line of comments.
 377     OS.PadToColumn(MAI->getCommentColumn());
 378     size_t Position = Comments.find('\n');
 379     OS << MAI->getCommentString() << ' ' << Comments.substr(0, Position) <<'\n';
 380
 381     Comments = Comments.substr(Position+1);
 382   } while (!Comments.empty());
 383
 384   CommentToEmit.clear();
 385 }
 386
 387 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
 388   assert(Bytes > 0 && Bytes <= 8 && "Invalid size!");
 389   return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
 390 }
 391
 392 void MCAsmStreamer::emitRawComment(const Twine &T, bool TabPrefix) {
 393   if (TabPrefix)
 394     OS << '\t';
 395   OS << MAI->getCommentString() << T;
 396   EmitEOL();
 397 }
 398
 399 void MCAsmStreamer::addExplicitComment(const Twine &T) {
 400   StringRef c = T.getSingleStringRef();
 401   if (c.equals(StringRef(MAI->getSeparatorString())))
 402     return;
 403   if (c.startswith(StringRef("//"))) {
 404     ExplicitCommentToEmit.append("\t");
 405     ExplicitCommentToEmit.append(MAI->getCommentString());
 406     // drop //
 407     ExplicitCommentToEmit.append(c.slice(2, c.size()).str());
 408   } else if (c.startswith(StringRef("/*"))) {
 409     size_t p = 2, len = c.size() - 2;
 410     // emit each line in comment as separate newline.
 411     do {
 412       size_t newp = std::min(len, c.find_first_of("\r\n", p));
 413       ExplicitCommentToEmit.append("\t");
 414       ExplicitCommentToEmit.append(MAI->getCommentString());
 415       ExplicitCommentToEmit.append(c.slice(p, newp).str());
 416       // If we have another line in this comment add line
 417       if (newp < len)
 418         ExplicitCommentToEmit.append("\n");
 419       p = newp + 1;
 420     } while (p < len);
 421   } else if (c.startswith(StringRef(MAI->getCommentString()))) {
 422     ExplicitCommentToEmit.append("\t");
 423     ExplicitCommentToEmit.append(c.str());
 424   } else if (c.front() == '#') {
 425
 426     ExplicitCommentToEmit.append("\t");
 427     ExplicitCommentToEmit.append(MAI->getCommentString());
 428     ExplicitCommentToEmit.append(c.slice(1, c.size()).str());
 429   } else
 430     assert(false && "Unexpected Assembly Comment");
 431   // full line comments immediately output
 432   if (c.back() == '\n')
 433     emitExplicitComments();
 434 }
 435
 436 void MCAsmStreamer::emitExplicitComments() {
 437   StringRef Comments = ExplicitCommentToEmit;
 438   if (!Comments.empty())
 439     OS << Comments;
 440   ExplicitCommentToEmit.clear();
 441 }
 442
 443 void MCAsmStreamer::ChangeSection(MCSection *Section,
 444                                   const MCExpr *Subsection) {
 445   assert(Section && "Cannot switch to a null section!");
 446   if (MCTargetStreamer *TS = getTargetStreamer()) {
 447     TS->changeSection(getCurrentSectionOnly(), Section, Subsection, OS);
 448   } else {
 449     Section->PrintSwitchToSection(
 450         *MAI, getContext().getObjectFileInfo()->getTargetTriple(), OS,
 451         Subsection);
 452   }
 453 }
 454
 455 void MCAsmStreamer::emitELFSymverDirective(StringRef AliasName,
 456                                            const MCSymbol *Aliasee) {
 457   OS << ".symver ";
 458   Aliasee->print(OS, MAI);
 459   OS << ", " << AliasName;
 460   EmitEOL();
 461 }
 462
 463 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol, SMLoc Loc) {
 464   MCStreamer::EmitLabel(Symbol, Loc);
 465
 466   Symbol->print(OS, MAI);
 467   OS << MAI->getLabelSuffix();
 468
 469   EmitEOL();
 470 }
 471
 472 void MCAsmStreamer::EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {
 473   StringRef str = MCLOHIdToName(Kind);
 474
 475 #ifndef NDEBUG
 476   int NbArgs = MCLOHIdToNbArgs(Kind);
 477   assert(NbArgs != -1 && ((size_t)NbArgs) == Args.size() && "Malformed LOH!");
 478   assert(str != "" && "Invalid LOH name");
 479 #endif
 480
 481   OS << "\t" << MCLOHDirectiveName() << " " << str << "\t";
 482   bool IsFirst = true;
 483   for (const MCSymbol *Arg : Args) {
 484     if (!IsFirst)
 485       OS << ", ";
 486     IsFirst = false;
 487     Arg->print(OS, MAI);
 488   }
 489   EmitEOL();
 490 }
 491
 492 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
 493   switch (Flag) {
 494   case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
 495   case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
 496   case MCAF_Code16:                OS << '\t'<< MAI->getCode16Directive();break;
 497   case MCAF_Code32:                OS << '\t'<< MAI->getCode32Directive();break;
 498   case MCAF_Code64:                OS << '\t'<< MAI->getCode64Directive();break;
 499   }
 500   EmitEOL();
 501 }
 502
 503 void MCAsmStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
 504   assert(!Options.empty() && "At least one option is required!");
 505   OS << "\t.linker_option \"" << Options[0] << '"';
 506   for (ArrayRef<std::string>::iterator it = Options.begin() + 1,
 507          ie = Options.end(); it != ie; ++it) {
 508     OS << ", " << '"' << *it << '"';
 509   }
 510   EmitEOL();
 511 }
 512
 513 void MCAsmStreamer::EmitDataRegion(MCDataRegionType Kind) {
 514   if (!MAI->doesSupportDataRegionDirectives())
 515     return;
 516   switch (Kind) {
 517   case MCDR_DataRegion:            OS << "\t.data_region"; break;
 518   case MCDR_DataRegionJT8:         OS << "\t.data_region jt8"; break;
 519   case MCDR_DataRegionJT16:        OS << "\t.data_region jt16"; break;
 520   case MCDR_DataRegionJT32:        OS << "\t.data_region jt32"; break;
 521   case MCDR_DataRegionEnd:         OS << "\t.end_data_region"; break;
 522   }
 523   EmitEOL();
 524 }
 525
 526 static const char *getVersionMinDirective(MCVersionMinType Type) {
 527   switch (Type) {
 528   case MCVM_WatchOSVersionMin: return ".watchos_version_min";
 529   case MCVM_TvOSVersionMin:    return ".tvos_version_min";
 530   case MCVM_IOSVersionMin:     return ".ios_version_min";
 531   case MCVM_OSXVersionMin:     return ".macosx_version_min";
 532   }
 533   llvm_unreachable("Invalid MC version min type");
 534 }
 535
 536 static void EmitSDKVersionSuffix(raw_ostream &OS,
 537                                  const VersionTuple &SDKVersion) {
 538   if (SDKVersion.empty())
 539     return;
 540   OS << '\t' << "sdk_version " << SDKVersion.getMajor();
 541   if (auto Minor = SDKVersion.getMinor()) {
 542     OS << ", " << *Minor;
 543     if (auto Subminor = SDKVersion.getSubminor()) {
 544       OS << ", " << *Subminor;
 545     }
 546   }
 547 }
 548
 549 void MCAsmStreamer::EmitVersionMin(MCVersionMinType Type, unsigned Major,
 550                                    unsigned Minor, unsigned Update,
 551                                    VersionTuple SDKVersion) {
 552   OS << '\t' << getVersionMinDirective(Type) << ' ' << Major << ", " << Minor;
 553   if (Update)
 554     OS << ", " << Update;
 555   EmitSDKVersionSuffix(OS, SDKVersion);
 556   EmitEOL();
 557 }
 558
 559 static const char *getPlatformName(MachO::PlatformType Type) {
 560   switch (Type) {
 561   case MachO::PLATFORM_MACOS:            return "macos";
 562   case MachO::PLATFORM_IOS:              return "ios";
 563   case MachO::PLATFORM_TVOS:             return "tvos";
 564   case MachO::PLATFORM_WATCHOS:          return "watchos";
 565   case MachO::PLATFORM_BRIDGEOS:         return "bridgeos";
 566   case MachO::PLATFORM_MACCATALYST:      return "macCatalyst";
 567   case MachO::PLATFORM_IOSSIMULATOR:     return "iossimulator";
 568   case MachO::PLATFORM_TVOSSIMULATOR:    return "tvossimulator";
 569   case MachO::PLATFORM_WATCHOSSIMULATOR: return "watchossimulator";
 570   }
 571   llvm_unreachable("Invalid Mach-O platform type");
 572 }
 573
 574 void MCAsmStreamer::EmitBuildVersion(unsigned Platform, unsigned Major,
 575                                      unsigned Minor, unsigned Update,
 576                                      VersionTuple SDKVersion) {
 577   const char *PlatformName = getPlatformName((MachO::PlatformType)Platform);
 578   OS << "\t.build_version " << PlatformName << ", " << Major << ", " << Minor;
 579   if (Update)
 580     OS << ", " << Update;
 581   EmitSDKVersionSuffix(OS, SDKVersion);
 582   EmitEOL();
 583 }
 584
 585 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
 586   // This needs to emit to a temporary string to get properly quoted
 587   // MCSymbols when they have spaces in them.
 588   OS << "\t.thumb_func";
 589   // Only Mach-O hasSubsectionsViaSymbols()
 590   if (MAI->hasSubsectionsViaSymbols()) {
 591     OS << '\t';
 592     Func->print(OS, MAI);
 593   }
 594   EmitEOL();
 595 }
 596
 597 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
 598   // Do not emit a .set on inlined target assignments.
 599   bool EmitSet = true;
 600   if (auto *E = dyn_cast<MCTargetExpr>(Value))
 601     if (E->inlineAssignedExpr())
 602       EmitSet = false;
 603   if (EmitSet) {
 604     OS << ".set ";
 605     Symbol->print(OS, MAI);
 606     OS << ", ";
 607     Value->print(OS, MAI);
 608
 609     EmitEOL();
 610   }
 611
 612   MCStreamer::EmitAssignment(Symbol, Value);
 613 }
 614
 615 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
 616   OS << ".weakref ";
 617   Alias->print(OS, MAI);
 618   OS << ", ";
 619   Symbol->print(OS, MAI);
 620   EmitEOL();
 621 }
 622
 623 bool MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
 624                                         MCSymbolAttr Attribute) {
 625   switch (Attribute) {
 626   case MCSA_Invalid: llvm_unreachable("Invalid symbol attribute");
 627   case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
 628   case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
 629   case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
 630   case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
 631   case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
 632   case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
 633   case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
 634     if (!MAI->hasDotTypeDotSizeDirective())
 635       return false; // Symbol attribute not supported
 636     OS << "\t.type\t";
 637     Symbol->print(OS, MAI);
 638     OS << ',' << ((MAI->getCommentString()[0] != '@') ? '@' : '%');
 639     switch (Attribute) {
 640     default: return false;
 641     case MCSA_ELF_TypeFunction:    OS << "function"; break;
 642     case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
 643     case MCSA_ELF_TypeObject:      OS << "object"; break;
 644     case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
 645     case MCSA_ELF_TypeCommon:      OS << "common"; break;
 646     case MCSA_ELF_TypeNoType:      OS << "notype"; break;
 647     case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
 648     }
 649     EmitEOL();
 650     return true;
 651   case MCSA_Global: // .globl/.global
 652     OS << MAI->getGlobalDirective();
 653     break;
 654   case MCSA_LGlobal:        OS << "\t.lglobl\t";          break;
 655   case MCSA_Hidden:         OS << "\t.hidden\t";          break;
 656   case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
 657   case MCSA_Internal:       OS << "\t.internal\t";        break;
 658   case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
 659   case MCSA_Local:          OS << "\t.local\t";           break;
 660   case MCSA_NoDeadStrip:
 661     if (!MAI->hasNoDeadStrip())
 662       return false;
 663     OS << "\t.no_dead_strip\t";
 664     break;
 665   case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
 666   case MCSA_AltEntry:       OS << "\t.alt_entry\t";       break;
 667   case MCSA_PrivateExtern:
 668     OS << "\t.private_extern\t";
 669     break;
 670   case MCSA_Protected:      OS << "\t.protected\t";       break;
 671   case MCSA_Reference:      OS << "\t.reference\t";       break;
 672   case MCSA_Weak:           OS << MAI->getWeakDirective(); break;
 673   case MCSA_WeakDefinition:
 674     OS << "\t.weak_definition\t";
 675     break;
 676       // .weak_reference
 677   case MCSA_WeakReference:  OS << MAI->getWeakRefDirective(); break;
 678   case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
 679   case MCSA_Cold:
 680     // Assemblers currently do not support a .cold directive.
 681     return false;
 682   }
 683
 684   Symbol->print(OS, MAI);
 685   EmitEOL();
 686
 687   return true;
 688 }
 689
 690 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
 691   OS << ".desc" << ' ';
 692   Symbol->print(OS, MAI);
 693   OS << ',' << DescValue;
 694   EmitEOL();
 695 }
 696
 697 void MCAsmStreamer::EmitSyntaxDirective() {
 698   if (MAI->getAssemblerDialect() == 1) {
 699     OS << "\t.intel_syntax noprefix";
 700     EmitEOL();
 701   }
 702   // FIXME: Currently emit unprefix'ed registers.
 703   // The intel_syntax directive has one optional argument
 704   // with may have a value of prefix or noprefix.
 705 }
 706
 707 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
 708   OS << "\t.def\t ";
 709   Symbol->print(OS, MAI);
 710   OS << ';';
 711   EmitEOL();
 712 }
 713
 714 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
 715   OS << "\t.scl\t" << StorageClass << ';';
 716   EmitEOL();
 717 }
 718
 719 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
 720   OS << "\t.type\t" << Type << ';';
 721   EmitEOL();
 722 }
 723
 724 void MCAsmStreamer::EndCOFFSymbolDef() {
 725   OS << "\t.endef";
 726   EmitEOL();
 727 }
 728
 729 void MCAsmStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
 730   OS << "\t.safeseh\t";
 731   Symbol->print(OS, MAI);
 732   EmitEOL();
 733 }
 734
 735 void MCAsmStreamer::EmitCOFFSymbolIndex(MCSymbol const *Symbol) {
 736   OS << "\t.symidx\t";
 737   Symbol->print(OS, MAI);
 738   EmitEOL();
 739 }
 740
 741 void MCAsmStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
 742   OS << "\t.secidx\t";
 743   Symbol->print(OS, MAI);
 744   EmitEOL();
 745 }
 746
 747 void MCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) {
 748   OS << "\t.secrel32\t";
 749   Symbol->print(OS, MAI);
 750   if (Offset != 0)
 751     OS << '+' << Offset;
 752   EmitEOL();
 753 }
 754
 755 void MCAsmStreamer::EmitCOFFImgRel32(MCSymbol const *Symbol, int64_t Offset) {
 756   OS << "\t.rva\t";
 757   Symbol->print(OS, MAI);
 758   if (Offset > 0)
 759     OS << '+' << Offset;
 760   else if (Offset < 0)
 761     OS << '-' << -Offset;
 762   EmitEOL();
 763 }
 764
 765 // We need an XCOFF-specific version of this directive as the AIX syntax
 766 // requires a QualName argument identifying the csect name and storage mapping
 767 // class to appear before the alignment if we are specifying it.
 768 void MCAsmStreamer::EmitXCOFFLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
 769                                                unsigned ByteAlignment) {
 770   assert(MAI->getLCOMMDirectiveAlignmentType() == LCOMM::Log2Alignment &&
 771          "We only support writing log base-2 alignment format with XCOFF.");
 772   assert(isPowerOf2_32(ByteAlignment) && "Alignment must be a power of 2.");
 773
 774   OS << "\t.lcomm\t";
 775   Symbol->print(OS, MAI);
 776   OS << ',' << Size;
 777   OS << ',' << Symbol->getName();
 778   OS << ',' << Log2_32(ByteAlignment);
 779
 780   EmitEOL();
 781 }
 782
 783 void MCAsmStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
 784   assert(MAI->hasDotTypeDotSizeDirective());
 785   OS << "\t.size\t";
 786   Symbol->print(OS, MAI);
 787   OS << ", ";
 788   Value->print(OS, MAI);
 789   EmitEOL();
 790 }
 791
 792 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
 793                                      unsigned ByteAlignment) {
 794   OS << "\t.comm\t";
 795   Symbol->print(OS, MAI);
 796   OS << ',' << Size;
 797
 798   if (ByteAlignment != 0) {
 799     if (MAI->getCOMMDirectiveAlignmentIsInBytes())
 800       OS << ',' << ByteAlignment;
 801     else
 802       OS << ',' << Log2_32(ByteAlignment);
 803   }
 804   EmitEOL();
 805 }
 806
 807 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
 808                                           unsigned ByteAlign) {
 809   OS << "\t.lcomm\t";
 810   Symbol->print(OS, MAI);
 811   OS << ',' << Size;
 812
 813   if (ByteAlign > 1) {
 814     switch (MAI->getLCOMMDirectiveAlignmentType()) {
 815     case LCOMM::NoAlignment:
 816       llvm_unreachable("alignment not supported on .lcomm!");
 817     case LCOMM::ByteAlignment:
 818       OS << ',' << ByteAlign;
 819       break;
 820     case LCOMM::Log2Alignment:
 821       assert(isPowerOf2_32(ByteAlign) && "alignment must be a power of 2");
 822       OS << ',' << Log2_32(ByteAlign);
 823       break;
 824     }
 825   }
 826   EmitEOL();
 827 }
 828
 829 void MCAsmStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
 830                                  uint64_t Size, unsigned ByteAlignment,
 831                                  SMLoc Loc) {
 832   if (Symbol)
 833     AssignFragment(Symbol, &Section->getDummyFragment());
 834
 835   // Note: a .zerofill directive does not switch sections.
 836   OS << ".zerofill ";
 837
 838   assert(Section->getVariant() == MCSection::SV_MachO &&
 839          ".zerofill is a Mach-O specific directive");
 840   // This is a mach-o specific directive.
 841
 842   const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
 843   OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
 844
 845   if (Symbol) {
 846     OS << ',';
 847     Symbol->print(OS, MAI);
 848     OS << ',' << Size;
 849     if (ByteAlignment != 0)
 850       OS << ',' << Log2_32(ByteAlignment);
 851   }
 852   EmitEOL();
 853 }
 854
 855 // .tbss sym, size, align
 856 // This depends that the symbol has already been mangled from the original,
 857 // e.g. _a.
 858 void MCAsmStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
 859                                    uint64_t Size, unsigned ByteAlignment) {
 860   AssignFragment(Symbol, &Section->getDummyFragment());
 861
 862   assert(Symbol && "Symbol shouldn't be NULL!");
 863   // Instead of using the Section we'll just use the shortcut.
 864
 865   assert(Section->getVariant() == MCSection::SV_MachO &&
 866          ".zerofill is a Mach-O specific directive");
 867   // This is a mach-o specific directive and section.
 868
 869   OS << ".tbss ";
 870   Symbol->print(OS, MAI);
 871   OS << ", " << Size;
 872
 873   // Output align if we have it.  We default to 1 so don't bother printing
 874   // that.
 875   if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
 876
 877   EmitEOL();
 878 }
 879
 880 static inline char toOctal(int X) { return (X&7)+'0'; }
 881
 882 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
 883   OS << '"';
 884
 885   for (unsigned i = 0, e = Data.size(); i != e; ++i) {
 886     unsigned char C = Data[i];
 887     if (C == '"' || C == '\\') {
 888       OS << '\\' << (char)C;
 889       continue;
 890     }
 891
 892     if (isPrint((unsigned char)C)) {
 893       OS << (char)C;
 894       continue;
 895     }
 896
 897     switch (C) {
 898       case '\b': OS << "\\b"; break;
 899       case '\f': OS << "\\f"; break;
 900       case '\n': OS << "\\n"; break;
 901       case '\r': OS << "\\r"; break;
 902       case '\t': OS << "\\t"; break;
 903       default:
 904         OS << '\\';
 905         OS << toOctal(C >> 6);
 906         OS << toOctal(C >> 3);
 907         OS << toOctal(C >> 0);
 908         break;
 909     }
 910   }
 911
 912   OS << '"';
 913 }
 914
 915 void MCAsmStreamer::EmitBytes(StringRef Data) {
 916   assert(getCurrentSectionOnly() &&
 917          "Cannot emit contents before setting section!");
 918   if (Data.empty()) return;
 919
 920   // If only single byte is provided or no ascii or asciz directives is
 921   // supported, emit as vector of 8bits data.
 922   if (Data.size() == 1 ||
 923       !(MAI->getAscizDirective() || MAI->getAsciiDirective())) {
 924     if (MCTargetStreamer *TS = getTargetStreamer()) {
 925       TS->emitRawBytes(Data);
 926     } else {
 927       const char *Directive = MAI->getData8bitsDirective();
 928       for (const unsigned char C : Data.bytes()) {
 929         OS << Directive << (unsigned)C;
 930         EmitEOL();
 931       }
 932     }
 933     return;
 934   }
 935
 936   // If the data ends with 0 and the target supports .asciz, use it, otherwise
 937   // use .ascii
 938   if (MAI->getAscizDirective() && Data.back() == 0) {
 939     OS << MAI->getAscizDirective();
 940     Data = Data.substr(0, Data.size()-1);
 941   } else {
 942     OS << MAI->getAsciiDirective();
 943   }
 944
 945   PrintQuotedString(Data, OS);
 946   EmitEOL();
 947 }
 948
 949 void MCAsmStreamer::EmitBinaryData(StringRef Data) {
 950   // This is binary data. Print it in a grid of hex bytes for readability.
 951   const size_t Cols = 4;
 952   for (size_t I = 0, EI = alignTo(Data.size(), Cols); I < EI; I += Cols) {
 953     size_t J = I, EJ = std::min(I + Cols, Data.size());
 954     assert(EJ > 0);
 955     OS << MAI->getData8bitsDirective();
 956     for (; J < EJ - 1; ++J)
 957       OS << format("0x%02x", uint8_t(Data[J])) << ", ";
 958     OS << format("0x%02x", uint8_t(Data[J]));
 959     EmitEOL();
 960   }
 961 }
 962
 963 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
 964   EmitValue(MCConstantExpr::create(Value, getContext()), Size);
 965 }
 966
 967 void MCAsmStreamer::EmitIntValueInHex(uint64_t Value, unsigned Size) {
 968   EmitValue(MCConstantExpr::create(Value, getContext(), true), Size);
 969 }
 970
 971 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
 972                                   SMLoc Loc) {
 973   assert(Size <= 8 && "Invalid size");
 974   assert(getCurrentSectionOnly() &&
 975          "Cannot emit contents before setting section!");
 976   const char *Directive = nullptr;
 977   switch (Size) {
 978   default: break;
 979   case 1: Directive = MAI->getData8bitsDirective();  break;
 980   case 2: Directive = MAI->getData16bitsDirective(); break;
 981   case 4: Directive = MAI->getData32bitsDirective(); break;
 982   case 8: Directive = MAI->getData64bitsDirective(); break;
 983   }
 984
 985   if (!Directive) {
 986     int64_t IntValue;
 987     if (!Value->evaluateAsAbsolute(IntValue))
 988       report_fatal_error("Don't know how to emit this value.");
 989
 990     // We couldn't handle the requested integer size so we fallback by breaking
 991     // the request down into several, smaller, integers.
 992     // Since sizes greater or equal to "Size" are invalid, we use the greatest
 993     // power of 2 that is less than "Size" as our largest piece of granularity.
 994     bool IsLittleEndian = MAI->isLittleEndian();
 995     for (unsigned Emitted = 0; Emitted != Size;) {
 996       unsigned Remaining = Size - Emitted;
 997       // The size of our partial emission must be a power of two less than
 998       // Size.
 999       unsigned EmissionSize = PowerOf2Floor(std::min(Remaining, Size - 1));
1000       // Calculate the byte offset of our partial emission taking into account
1001       // the endianness of the target.
1002       unsigned ByteOffset =
1003           IsLittleEndian ? Emitted : (Remaining - EmissionSize);
1004       uint64_t ValueToEmit = IntValue >> (ByteOffset * 8);
1005       // We truncate our partial emission to fit within the bounds of the
1006       // emission domain.  This produces nicer output and silences potential
1007       // truncation warnings when round tripping through another assembler.
1008       uint64_t Shift = 64 - EmissionSize * 8;
1009       assert(Shift < static_cast<uint64_t>(
1010                          std::numeric_limits<unsigned long long>::digits) &&
1011              "undefined behavior");
1012       ValueToEmit &= ~0ULL >> Shift;
1013       EmitIntValue(ValueToEmit, EmissionSize);
1014       Emitted += EmissionSize;
1015     }
1016     return;
1017   }
1018
1019   assert(Directive && "Invalid size for machine code value!");
1020   OS << Directive;
1021   if (MCTargetStreamer *TS = getTargetStreamer()) {
1022     TS->emitValue(Value);
1023   } else {
1024     Value->print(OS, MAI);
1025     EmitEOL();
1026   }
1027 }
1028
1029 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
1030   int64_t IntValue;
1031   if (Value->evaluateAsAbsolute(IntValue)) {
1032     EmitULEB128IntValue(IntValue);
1033     return;
1034   }
1035   OS << "\t.uleb128 ";
1036   Value->print(OS, MAI);
1037   EmitEOL();
1038 }
1039
1040 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
1041   int64_t IntValue;
1042   if (Value->evaluateAsAbsolute(IntValue)) {
1043     EmitSLEB128IntValue(IntValue);
1044     return;
1045   }
1046   OS << "\t.sleb128 ";
1047   Value->print(OS, MAI);
1048   EmitEOL();
1049 }
1050
1051 void MCAsmStreamer::EmitDTPRel64Value(const MCExpr *Value) {
1052   assert(MAI->getDTPRel64Directive() != nullptr);
1053   OS << MAI->getDTPRel64Directive();
1054   Value->print(OS, MAI);
1055   EmitEOL();
1056 }
1057
1058 void MCAsmStreamer::EmitDTPRel32Value(const MCExpr *Value) {
1059   assert(MAI->getDTPRel32Directive() != nullptr);
1060   OS << MAI->getDTPRel32Directive();
1061   Value->print(OS, MAI);
1062   EmitEOL();
1063 }
1064
1065 void MCAsmStreamer::EmitTPRel64Value(const MCExpr *Value) {
1066   assert(MAI->getTPRel64Directive() != nullptr);
1067   OS << MAI->getTPRel64Directive();
1068   Value->print(OS, MAI);
1069   EmitEOL();
1070 }
1071
1072 void MCAsmStreamer::EmitTPRel32Value(const MCExpr *Value) {
1073   assert(MAI->getTPRel32Directive() != nullptr);
1074   OS << MAI->getTPRel32Directive();
1075   Value->print(OS, MAI);
1076   EmitEOL();
1077 }
1078
1079 void MCAsmStreamer::EmitGPRel64Value(const MCExpr *Value) {
1080   assert(MAI->getGPRel64Directive() != nullptr);
1081   OS << MAI->getGPRel64Directive();
1082   Value->print(OS, MAI);
1083   EmitEOL();
1084 }
1085
1086 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
1087   assert(MAI->getGPRel32Directive() != nullptr);
1088   OS << MAI->getGPRel32Directive();
1089   Value->print(OS, MAI);
1090   EmitEOL();
1091 }
1092
1093 void MCAsmStreamer::emitFill(const MCExpr &NumBytes, uint64_t FillValue,
1094                              SMLoc Loc) {
1095   int64_t IntNumBytes;
1096   if (NumBytes.evaluateAsAbsolute(IntNumBytes) && IntNumBytes == 0)
1097     return;
1098
1099   if (const char *ZeroDirective = MAI->getZeroDirective()) {
1100     // FIXME: Emit location directives
1101     OS << ZeroDirective;
1102     NumBytes.print(OS, MAI);
1103     if (FillValue != 0)
1104       OS << ',' << (int)FillValue;
1105     EmitEOL();
1106     return;
1107   }
1108
1109   MCStreamer::emitFill(NumBytes, FillValue);
1110 }
1111
1112 void MCAsmStreamer::emitFill(const MCExpr &NumValues, int64_t Size,
1113                              int64_t Expr, SMLoc Loc) {
1114   // FIXME: Emit location directives
1115   OS << "\t.fill\t";
1116   NumValues.print(OS, MAI);
1117   OS << ", " << Size << ", 0x";
1118   OS.write_hex(truncateToSize(Expr, 4));
1119   EmitEOL();
1120 }
1121
1122 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
1123                                          unsigned ValueSize,
1124                                          unsigned MaxBytesToEmit) {
1125   if (MAI->useDotAlignForAlignment()) {
1126     if (!isPowerOf2_32(ByteAlignment))
1127       report_fatal_error("Only power-of-two alignments are supported "
1128                          "with .align.");
1129     OS << "\t.align\t";
1130     OS << Log2_32(ByteAlignment);
1131     EmitEOL();
1132     return;
1133   }
1134
1135   // Some assemblers don't support non-power of two alignments, so we always
1136   // emit alignments as a power of two if possible.
1137   if (isPowerOf2_32(ByteAlignment)) {
1138     switch (ValueSize) {
1139     default:
1140       llvm_unreachable("Invalid size for machine code value!");
1141     case 1:
1142       OS << "\t.p2align\t";
1143       break;
1144     case 2:
1145       OS << ".p2alignw ";
1146       break;
1147     case 4:
1148       OS << ".p2alignl ";
1149       break;
1150     case 8:
1151       llvm_unreachable("Unsupported alignment size!");
1152     }
1153
1154     OS << Log2_32(ByteAlignment);
1155
1156     if (Value || MaxBytesToEmit) {
1157       OS << ", 0x";
1158       OS.write_hex(truncateToSize(Value, ValueSize));
1159
1160       if (MaxBytesToEmit)
1161         OS << ", " << MaxBytesToEmit;
1162     }
1163     EmitEOL();
1164     return;
1165   }
1166
1167   // Non-power of two alignment.  This is not widely supported by assemblers.
1168   // FIXME: Parameterize this based on MAI.
1169   switch (ValueSize) {
1170   default: llvm_unreachable("Invalid size for machine code value!");
1171   case 1: OS << ".balign";  break;
1172   case 2: OS << ".balignw"; break;
1173   case 4: OS << ".balignl"; break;
1174   case 8: llvm_unreachable("Unsupported alignment size!");
1175   }
1176
1177   OS << ' ' << ByteAlignment;
1178   OS << ", " << truncateToSize(Value, ValueSize);
1179   if (MaxBytesToEmit)
1180     OS << ", " << MaxBytesToEmit;
1181   EmitEOL();
1182 }
1183
1184 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
1185                                       unsigned MaxBytesToEmit) {
1186   // Emit with a text fill value.
1187   EmitValueToAlignment(ByteAlignment, MAI->getTextAlignFillValue(),
1188                        1, MaxBytesToEmit);
1189 }
1190
1191 void MCAsmStreamer::emitValueToOffset(const MCExpr *Offset,
1192                                       unsigned char Value,
1193                                       SMLoc Loc) {
1194   // FIXME: Verify that Offset is associated with the current section.
1195   OS << ".org ";
1196   Offset->print(OS, MAI);
1197   OS << ", " << (unsigned)Value;
1198   EmitEOL();
1199 }
1200
1201 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
1202   assert(MAI->hasSingleParameterDotFile());
1203   OS << "\t.file\t";
1204   PrintQuotedString(Filename, OS);
1205   EmitEOL();
1206 }
1207
1208 static void printDwarfFileDirective(unsigned FileNo, StringRef Directory,
1209                                     StringRef Filename,
1210                                     Optional<MD5::MD5Result> Checksum,
1211                                     Optional<StringRef> Source,
1212                                     bool UseDwarfDirectory,
1213                                     raw_svector_ostream &OS) {
1214   SmallString<128> FullPathName;
1215
1216   if (!UseDwarfDirectory && !Directory.empty()) {
1217     if (sys::path::is_absolute(Filename))
1218       Directory = "";
1219     else {
1220       FullPathName = Directory;
1221       sys::path::append(FullPathName, Filename);
1222       Directory = "";
1223       Filename = FullPathName;
1224     }
1225   }
1226
1227   OS << "\t.file\t" << FileNo << ' ';
1228   if (!Directory.empty()) {
1229     PrintQuotedString(Directory, OS);
1230     OS << ' ';
1231   }
1232   PrintQuotedString(Filename, OS);
1233   if (Checksum)
1234     OS << " md5 0x" << Checksum->digest();
1235   if (Source) {
1236     OS << " source ";
1237     PrintQuotedString(*Source, OS);
1238   }
1239 }
1240
1241 Expected<unsigned> MCAsmStreamer::tryEmitDwarfFileDirective(
1242     unsigned FileNo, StringRef Directory, StringRef Filename,
1243     Optional<MD5::MD5Result> Checksum, Optional<StringRef> Source, unsigned CUID) {
1244   assert(CUID == 0 && "multiple CUs not supported by MCAsmStreamer");
1245
1246   MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
1247   unsigned NumFiles = Table.getMCDwarfFiles().size();
1248   Expected<unsigned> FileNoOrErr =
1249       Table.tryGetFile(Directory, Filename, Checksum, Source,
1250                        getContext().getDwarfVersion(), FileNo);
1251   if (!FileNoOrErr)
1252     return FileNoOrErr.takeError();
1253   FileNo = FileNoOrErr.get();
1254   if (NumFiles == Table.getMCDwarfFiles().size())
1255     return FileNo;
1256
1257   SmallString<128> Str;
1258   raw_svector_ostream OS1(Str);
1259   printDwarfFileDirective(FileNo, Directory, Filename, Checksum, Source,
1260                           UseDwarfDirectory, OS1);
1261
1262   if (MCTargetStreamer *TS = getTargetStreamer())
1263     TS->emitDwarfFileDirective(OS1.str());
1264   else
1265     EmitRawText(OS1.str());
1266
1267   return FileNo;
1268 }
1269
1270 void MCAsmStreamer::emitDwarfFile0Directive(StringRef Directory,
1271                                             StringRef Filename,
1272                                             Optional<MD5::MD5Result> Checksum,
1273                                             Optional<StringRef> Source,
1274                                             unsigned CUID) {
1275   assert(CUID == 0);
1276   // .file 0 is new for DWARF v5.
1277   if (getContext().getDwarfVersion() < 5)
1278     return;
1279   // Inform MCDwarf about the root file.
1280   getContext().setMCLineTableRootFile(CUID, Directory, Filename, Checksum,
1281                                       Source);
1282
1283   SmallString<128> Str;
1284   raw_svector_ostream OS1(Str);
1285   printDwarfFileDirective(0, Directory, Filename, Checksum, Source,
1286                           UseDwarfDirectory, OS1);
1287
1288   if (MCTargetStreamer *TS = getTargetStreamer())
1289     TS->emitDwarfFileDirective(OS1.str());
1290   else
1291     EmitRawText(OS1.str());
1292 }
1293
1294 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
1295                                           unsigned Column, unsigned Flags,
1296                                           unsigned Isa,
1297                                           unsigned Discriminator,
1298                                           StringRef FileName) {
1299   OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
1300   if (MAI->supportsExtendedDwarfLocDirective()) {
1301     if (Flags & DWARF2_FLAG_BASIC_BLOCK)
1302       OS << " basic_block";
1303     if (Flags & DWARF2_FLAG_PROLOGUE_END)
1304       OS << " prologue_end";
1305     if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
1306       OS << " epilogue_begin";
1307
1308     unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
1309     if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
1310       OS << " is_stmt ";
1311
1312       if (Flags & DWARF2_FLAG_IS_STMT)
1313         OS << "1";
1314       else
1315         OS << "0";
1316     }
1317
1318     if (Isa)
1319       OS << " isa " << Isa;
1320     if (Discriminator)
1321       OS << " discriminator " << Discriminator;
1322   }
1323
1324   if (IsVerboseAsm) {
1325     OS.PadToColumn(MAI->getCommentColumn());
1326     OS << MAI->getCommentString() << ' ' << FileName << ':'
1327        << Line << ':' << Column;
1328   }
1329   EmitEOL();
1330   this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
1331                                           Isa, Discriminator, FileName);
1332 }
1333
1334 MCSymbol *MCAsmStreamer::getDwarfLineTableSymbol(unsigned CUID) {
1335   // Always use the zeroth line table, since asm syntax only supports one line
1336   // table for now.
1337   return MCStreamer::getDwarfLineTableSymbol(0);
1338 }
1339
1340 bool MCAsmStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename,
1341                                         ArrayRef<uint8_t> Checksum,
1342                                         unsigned ChecksumKind) {
1343   if (!getContext().getCVContext().addFile(*this, FileNo, Filename, Checksum,
1344                                            ChecksumKind))
1345     return false;
1346
1347   OS << "\t.cv_file\t" << FileNo << ' ';
1348   PrintQuotedString(Filename, OS);
1349
1350   if (!ChecksumKind) {
1351     EmitEOL();
1352     return true;
1353   }
1354
1355   OS << ' ';
1356   PrintQuotedString(toHex(Checksum), OS);
1357   OS << ' ' << ChecksumKind;
1358
1359   EmitEOL();
1360   return true;
1361 }
1362
1363 bool MCAsmStreamer::EmitCVFuncIdDirective(unsigned FuncId) {
1364   OS << "\t.cv_func_id " << FuncId << '\n';
1365   return MCStreamer::EmitCVFuncIdDirective(FuncId);
1366 }
1367
1368 bool MCAsmStreamer::EmitCVInlineSiteIdDirective(unsigned FunctionId,
1369                                                 unsigned IAFunc,
1370                                                 unsigned IAFile,
1371                                                 unsigned IALine, unsigned IACol,
1372                                                 SMLoc Loc) {
1373   OS << "\t.cv_inline_site_id " << FunctionId << " within " << IAFunc
1374      << " inlined_at " << IAFile << ' ' << IALine << ' ' << IACol << '\n';
1375   return MCStreamer::EmitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile,
1376                                                  IALine, IACol, Loc);
1377 }
1378
1379 void MCAsmStreamer::EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,
1380                                        unsigned Line, unsigned Column,
1381                                        bool PrologueEnd, bool IsStmt,
1382                                        StringRef FileName, SMLoc Loc) {
1383   // Validate the directive.
1384   if (!checkCVLocSection(FunctionId, FileNo, Loc))
1385     return;
1386
1387   OS << "\t.cv_loc\t" << FunctionId << " " << FileNo << " " << Line << " "
1388      << Column;
1389   if (PrologueEnd)
1390     OS << " prologue_end";
1391
1392   if (IsStmt)
1393     OS << " is_stmt 1";
1394
1395   if (IsVerboseAsm) {
1396     OS.PadToColumn(MAI->getCommentColumn());
1397     OS << MAI->getCommentString() << ' ' << FileName << ':' << Line << ':'
1398        << Column;
1399   }
1400   EmitEOL();
1401 }
1402
1403 void MCAsmStreamer::EmitCVLinetableDirective(unsigned FunctionId,
1404                                              const MCSymbol *FnStart,
1405                                              const MCSymbol *FnEnd) {
1406   OS << "\t.cv_linetable\t" << FunctionId << ", ";
1407   FnStart->print(OS, MAI);
1408   OS << ", ";
1409   FnEnd->print(OS, MAI);
1410   EmitEOL();
1411   this->MCStreamer::EmitCVLinetableDirective(FunctionId, FnStart, FnEnd);
1412 }
1413
1414 void MCAsmStreamer::EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
1415                                                    unsigned SourceFileId,
1416                                                    unsigned SourceLineNum,
1417                                                    const MCSymbol *FnStartSym,
1418                                                    const MCSymbol *FnEndSym) {
1419   OS << "\t.cv_inline_linetable\t" << PrimaryFunctionId << ' ' << SourceFileId
1420      << ' ' << SourceLineNum << ' ';
1421   FnStartSym->print(OS, MAI);
1422   OS << ' ';
1423   FnEndSym->print(OS, MAI);
1424   EmitEOL();
1425   this->MCStreamer::EmitCVInlineLinetableDirective(
1426       PrimaryFunctionId, SourceFileId, SourceLineNum, FnStartSym, FnEndSym);
1427 }
1428
1429 void MCAsmStreamer::PrintCVDefRangePrefix(
1430     ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges) {
1431   OS << "\t.cv_def_range\t";
1432   for (std::pair<const MCSymbol *, const MCSymbol *> Range : Ranges) {
1433     OS << ' ';
1434     Range.first->print(OS, MAI);
1435     OS << ' ';
1436     Range.second->print(OS, MAI);
1437   }
1438 }
1439
1440 void MCAsmStreamer::EmitCVDefRangeDirective(
1441     ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
1442     codeview::DefRangeRegisterRelHeader DRHdr) {
1443   PrintCVDefRangePrefix(Ranges);
1444   OS << ", reg_rel, ";
1445   OS << DRHdr.Register << ", " << DRHdr.Flags << ", "
1446      << DRHdr.BasePointerOffset;
1447   EmitEOL();
1448 }
1449
1450 void MCAsmStreamer::EmitCVDefRangeDirective(
1451     ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
1452     codeview::DefRangeSubfieldRegisterHeader DRHdr) {
1453   PrintCVDefRangePrefix(Ranges);
1454   OS << ", subfield_reg, ";
1455   OS << DRHdr.Register << ", " << DRHdr.OffsetInParent;
1456   EmitEOL();
1457 }
1458
1459 void MCAsmStreamer::EmitCVDefRangeDirective(
1460     ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
1461     codeview::DefRangeRegisterHeader DRHdr) {
1462   PrintCVDefRangePrefix(Ranges);
1463   OS << ", reg, ";
1464   OS << DRHdr.Register;
1465   EmitEOL();
1466 }
1467
1468 void MCAsmStreamer::EmitCVDefRangeDirective(
1469     ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
1470     codeview::DefRangeFramePointerRelHeader DRHdr) {
1471   PrintCVDefRangePrefix(Ranges);
1472   OS << ", frame_ptr_rel, ";
1473   OS << DRHdr.Offset;
1474   EmitEOL();
1475 }
1476
1477 void MCAsmStreamer::EmitCVStringTableDirective() {
1478   OS << "\t.cv_stringtable";
1479   EmitEOL();
1480 }
1481
1482 void MCAsmStreamer::EmitCVFileChecksumsDirective() {
1483   OS << "\t.cv_filechecksums";
1484   EmitEOL();
1485 }
1486
1487 void MCAsmStreamer::EmitCVFileChecksumOffsetDirective(unsigned FileNo) {
1488   OS << "\t.cv_filechecksumoffset\t" << FileNo;
1489   EmitEOL();
1490 }
1491
1492 void MCAsmStreamer::EmitCVFPOData(const MCSymbol *ProcSym, SMLoc L) {
1493   OS << "\t.cv_fpo_data\t";
1494   ProcSym->print(OS, MAI);
1495   EmitEOL();
1496 }
1497
1498 void MCAsmStreamer::EmitIdent(StringRef IdentString) {
1499   assert(MAI->hasIdentDirective() && ".ident directive not supported");
1500   OS << "\t.ident\t";
1501   PrintQuotedString(IdentString, OS);
1502   EmitEOL();
1503 }
1504
1505 void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
1506   MCStreamer::EmitCFISections(EH, Debug);
1507   OS << "\t.cfi_sections ";
1508   if (EH) {
1509     OS << ".eh_frame";
1510     if (Debug)
1511       OS << ", .debug_frame";
1512   } else if (Debug) {
1513     OS << ".debug_frame";
1514   }
1515
1516   EmitEOL();
1517 }
1518
1519 void MCAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
1520   OS << "\t.cfi_startproc";
1521   if (Frame.IsSimple)
1522     OS << " simple";
1523   EmitEOL();
1524 }
1525
1526 void MCAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
1527   MCStreamer::EmitCFIEndProcImpl(Frame);
1528   OS << "\t.cfi_endproc";
1529   EmitEOL();
1530 }
1531
1532 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
1533   if (!MAI->useDwarfRegNumForCFI()) {
1534     // User .cfi_* directives can use arbitrary DWARF register numbers, not
1535     // just ones that map to LLVM register numbers and have known names.
1536     // Fall back to using the original number directly if no name is known.
1537     const MCRegisterInfo *MRI = getContext().getRegisterInfo();
1538     if (Optional<unsigned> LLVMRegister = MRI->getLLVMRegNum(Register, true)) {
1539       InstPrinter->printRegName(OS, *LLVMRegister);
1540       return;
1541     }
1542   }
1543   OS << Register;
1544 }
1545
1546 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
1547   MCStreamer::EmitCFIDefCfa(Register, Offset);
1548   OS << "\t.cfi_def_cfa ";
1549   EmitRegisterName(Register);
1550   OS << ", " << Offset;
1551   EmitEOL();
1552 }
1553
1554 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
1555   MCStreamer::EmitCFIDefCfaOffset(Offset);
1556   OS << "\t.cfi_def_cfa_offset " << Offset;
1557   EmitEOL();
1558 }
1559
1560 static void PrintCFIEscape(llvm::formatted_raw_ostream &OS, StringRef Values) {
1561   OS << "\t.cfi_escape ";
1562   if (!Values.empty()) {
1563     size_t e = Values.size() - 1;
1564     for (size_t i = 0; i < e; ++i)
1565       OS << format("0x%02x", uint8_t(Values[i])) << ", ";
1566     OS << format("0x%02x", uint8_t(Values[e]));
1567   }
1568 }
1569
1570 void MCAsmStreamer::EmitCFIEscape(StringRef Values) {
1571   MCStreamer::EmitCFIEscape(Values);
1572   PrintCFIEscape(OS, Values);
1573   EmitEOL();
1574 }
1575
1576 void MCAsmStreamer::EmitCFIGnuArgsSize(int64_t Size) {
1577   MCStreamer::EmitCFIGnuArgsSize(Size);
1578
1579   uint8_t Buffer[16] = { dwarf::DW_CFA_GNU_args_size };
1580   unsigned Len = encodeULEB128(Size, Buffer + 1) + 1;
1581
1582   PrintCFIEscape(OS, StringRef((const char *)&Buffer[0], Len));
1583   EmitEOL();
1584 }
1585
1586 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
1587   MCStreamer::EmitCFIDefCfaRegister(Register);
1588   OS << "\t.cfi_def_cfa_register ";
1589   EmitRegisterName(Register);
1590   EmitEOL();
1591 }
1592
1593 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
1594   this->MCStreamer::EmitCFIOffset(Register, Offset);
1595   OS << "\t.cfi_offset ";
1596   EmitRegisterName(Register);
1597   OS << ", " << Offset;
1598   EmitEOL();
1599 }
1600
1601 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
1602                                        unsigned Encoding) {
1603   MCStreamer::EmitCFIPersonality(Sym, Encoding);
1604   OS << "\t.cfi_personality " << Encoding << ", ";
1605   Sym->print(OS, MAI);
1606   EmitEOL();
1607 }
1608
1609 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
1610   MCStreamer::EmitCFILsda(Sym, Encoding);
1611   OS << "\t.cfi_lsda " << Encoding << ", ";
1612   Sym->print(OS, MAI);
1613   EmitEOL();
1614 }
1615
1616 void MCAsmStreamer::EmitCFIRememberState() {
1617   MCStreamer::EmitCFIRememberState();
1618   OS << "\t.cfi_remember_state";
1619   EmitEOL();
1620 }
1621
1622 void MCAsmStreamer::EmitCFIRestoreState() {
1623   MCStreamer::EmitCFIRestoreState();
1624   OS << "\t.cfi_restore_state";
1625   EmitEOL();
1626 }
1627
1628 void MCAsmStreamer::EmitCFIRestore(int64_t Register) {
1629   MCStreamer::EmitCFIRestore(Register);
1630   OS << "\t.cfi_restore ";
1631   EmitRegisterName(Register);
1632   EmitEOL();
1633 }
1634
1635 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
1636   MCStreamer::EmitCFISameValue(Register);
1637   OS << "\t.cfi_same_value ";
1638   EmitRegisterName(Register);
1639   EmitEOL();
1640 }
1641
1642 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
1643   MCStreamer::EmitCFIRelOffset(Register, Offset);
1644   OS << "\t.cfi_rel_offset ";
1645   EmitRegisterName(Register);
1646   OS << ", " << Offset;
1647   EmitEOL();
1648 }
1649
1650 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
1651   MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
1652   OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
1653   EmitEOL();
1654 }
1655
1656 void MCAsmStreamer::EmitCFISignalFrame() {
1657   MCStreamer::EmitCFISignalFrame();
1658   OS << "\t.cfi_signal_frame";
1659   EmitEOL();
1660 }
1661
1662 void MCAsmStreamer::EmitCFIUndefined(int64_t Register) {
1663   MCStreamer::EmitCFIUndefined(Register);
1664   OS << "\t.cfi_undefined " << Register;
1665   EmitEOL();
1666 }
1667
1668 void MCAsmStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
1669   MCStreamer::EmitCFIRegister(Register1, Register2);
1670   OS << "\t.cfi_register " << Register1 << ", " << Register2;
1671   EmitEOL();
1672 }
1673
1674 void MCAsmStreamer::EmitCFIWindowSave() {
1675   MCStreamer::EmitCFIWindowSave();
1676   OS << "\t.cfi_window_save";
1677   EmitEOL();
1678 }
1679
1680 void MCAsmStreamer::EmitCFINegateRAState() {
1681   MCStreamer::EmitCFINegateRAState();
1682   OS << "\t.cfi_negate_ra_state";
1683   EmitEOL();
1684 }
1685
1686 void MCAsmStreamer::EmitCFIReturnColumn(int64_t Register) {
1687   MCStreamer::EmitCFIReturnColumn(Register);
1688   OS << "\t.cfi_return_column " << Register;
1689   EmitEOL();
1690 }
1691
1692 void MCAsmStreamer::EmitCFIBKeyFrame() {
1693   MCStreamer::EmitCFIBKeyFrame();
1694   OS << "\t.cfi_b_key_frame";
1695   EmitEOL();
1696 }
1697
1698 void MCAsmStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc) {
1699   MCStreamer::EmitWinCFIStartProc(Symbol, Loc);
1700
1701   OS << ".seh_proc ";
1702   Symbol->print(OS, MAI);
1703   EmitEOL();
1704 }
1705
1706 void MCAsmStreamer::EmitWinCFIEndProc(SMLoc Loc) {
1707   MCStreamer::EmitWinCFIEndProc(Loc);
1708
1709   OS << "\t.seh_endproc";
1710   EmitEOL();
1711 }
1712
1713 // TODO: Implement
1714 void MCAsmStreamer::EmitWinCFIFuncletOrFuncEnd(SMLoc Loc) {
1715 }
1716
1717 void MCAsmStreamer::EmitWinCFIStartChained(SMLoc Loc) {
1718   MCStreamer::EmitWinCFIStartChained(Loc);
1719
1720   OS << "\t.seh_startchained";
1721   EmitEOL();
1722 }
1723
1724 void MCAsmStreamer::EmitWinCFIEndChained(SMLoc Loc) {
1725   MCStreamer::EmitWinCFIEndChained(Loc);
1726
1727   OS << "\t.seh_endchained";
1728   EmitEOL();
1729 }
1730
1731 void MCAsmStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
1732                                      bool Except, SMLoc Loc) {
1733   MCStreamer::EmitWinEHHandler(Sym, Unwind, Except, Loc);
1734
1735   OS << "\t.seh_handler ";
1736   Sym->print(OS, MAI);
1737   if (Unwind)
1738     OS << ", @unwind";
1739   if (Except)
1740     OS << ", @except";
1741   EmitEOL();
1742 }
1743
1744 void MCAsmStreamer::EmitWinEHHandlerData(SMLoc Loc) {
1745   MCStreamer::EmitWinEHHandlerData(Loc);
1746
1747   // Switch sections. Don't call SwitchSection directly, because that will
1748   // cause the section switch to be visible in the emitted assembly.
1749   // We only do this so the section switch that terminates the handler
1750   // data block is visible.
1751   WinEH::FrameInfo *CurFrame = getCurrentWinFrameInfo();
1752
1753   // Do nothing if no frame is open. MCStreamer should've already reported an
1754   // error.
1755   if (!CurFrame)
1756     return;
1757
1758   MCSection *TextSec = &CurFrame->Function->getSection();
1759   MCSection *XData = getAssociatedXDataSection(TextSec);
1760   SwitchSectionNoChange(XData);
1761
1762   OS << "\t.seh_handlerdata";
1763   EmitEOL();
1764 }
1765
1766 void MCAsmStreamer::EmitWinCFIPushReg(MCRegister Register, SMLoc Loc) {
1767   MCStreamer::EmitWinCFIPushReg(Register, Loc);
1768
1769   OS << "\t.seh_pushreg ";
1770   InstPrinter->printRegName(OS, Register);
1771   EmitEOL();
1772 }
1773
1774 void MCAsmStreamer::EmitWinCFISetFrame(MCRegister Register, unsigned Offset,
1775                                        SMLoc Loc) {
1776   MCStreamer::EmitWinCFISetFrame(Register, Offset, Loc);
1777
1778   OS << "\t.seh_setframe ";
1779   InstPrinter->printRegName(OS, Register);
1780   OS << ", " << Offset;
1781   EmitEOL();
1782 }
1783
1784 void MCAsmStreamer::EmitWinCFIAllocStack(unsigned Size, SMLoc Loc) {
1785   MCStreamer::EmitWinCFIAllocStack(Size, Loc);
1786
1787   OS << "\t.seh_stackalloc " << Size;
1788   EmitEOL();
1789 }
1790
1791 void MCAsmStreamer::EmitWinCFISaveReg(MCRegister Register, unsigned Offset,
1792                                       SMLoc Loc) {
1793   MCStreamer::EmitWinCFISaveReg(Register, Offset, Loc);
1794
1795   OS << "\t.seh_savereg ";
1796   InstPrinter->printRegName(OS, Register);
1797   OS << ", " << Offset;
1798   EmitEOL();
1799 }
1800
1801 void MCAsmStreamer::EmitWinCFISaveXMM(MCRegister Register, unsigned Offset,
1802                                       SMLoc Loc) {
1803   MCStreamer::EmitWinCFISaveXMM(Register, Offset, Loc);
1804
1805   OS << "\t.seh_savexmm ";
1806   InstPrinter->printRegName(OS, Register);
1807   OS << ", " << Offset;
1808   EmitEOL();
1809 }
1810
1811 void MCAsmStreamer::EmitWinCFIPushFrame(bool Code, SMLoc Loc) {
1812   MCStreamer::EmitWinCFIPushFrame(Code, Loc);
1813
1814   OS << "\t.seh_pushframe";
1815   if (Code)
1816     OS << " @code";
1817   EmitEOL();
1818 }
1819
1820 void MCAsmStreamer::EmitWinCFIEndProlog(SMLoc Loc) {
1821   MCStreamer::EmitWinCFIEndProlog(Loc);
1822
1823   OS << "\t.seh_endprologue";
1824   EmitEOL();
1825 }
1826
1827 void MCAsmStreamer::emitCGProfileEntry(const MCSymbolRefExpr *From,
1828                                        const MCSymbolRefExpr *To,
1829                                        uint64_t Count) {
1830   OS << "\t.cg_profile ";
1831   From->getSymbol().print(OS, MAI);
1832   OS << ", ";
1833   To->getSymbol().print(OS, MAI);
1834   OS << ", " << Count;
1835   EmitEOL();
1836 }
1837
1838 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst,
1839                                        const MCSubtargetInfo &STI) {
1840   raw_ostream &OS = GetCommentOS();
1841   SmallString<256> Code;
1842   SmallVector<MCFixup, 4> Fixups;
1843   raw_svector_ostream VecOS(Code);
1844
1845   // If we have no code emitter, don't emit code.
1846   if (!getAssembler().getEmitterPtr())
1847     return;
1848
1849   getAssembler().getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
1850
1851   // If we are showing fixups, create symbolic markers in the encoded
1852   // representation. We do this by making a per-bit map to the fixup item index,
1853   // then trying to display it as nicely as possible.
1854   SmallVector<uint8_t, 64> FixupMap;
1855   FixupMap.resize(Code.size() * 8);
1856   for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1857     FixupMap[i] = 0;
1858
1859   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1860     MCFixup &F = Fixups[i];
1861     const MCFixupKindInfo &Info =
1862         getAssembler().getBackend().getFixupKindInfo(F.getKind());
1863     for (unsigned j = 0; j != Info.TargetSize; ++j) {
1864       unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1865       assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1866       FixupMap[Index] = 1 + i;
1867     }
1868   }
1869
1870   // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1871   // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1872   OS << "encoding: [";
1873   for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1874     if (i)
1875       OS << ',';
1876
1877     // See if all bits are the same map entry.
1878     uint8_t MapEntry = FixupMap[i * 8 + 0];
1879     for (unsigned j = 1; j != 8; ++j) {
1880       if (FixupMap[i * 8 + j] == MapEntry)
1881         continue;
1882
1883       MapEntry = uint8_t(~0U);
1884       break;
1885     }
1886
1887     if (MapEntry != uint8_t(~0U)) {
1888       if (MapEntry == 0) {
1889         OS << format("0x%02x", uint8_t(Code[i]));
1890       } else {
1891         if (Code[i]) {
1892           // FIXME: Some of the 8 bits require fix up.
1893           OS << format("0x%02x", uint8_t(Code[i])) << '\''
1894              << char('A' + MapEntry - 1) << '\'';
1895         } else
1896           OS << char('A' + MapEntry - 1);
1897       }
1898     } else {
1899       // Otherwise, write out in binary.
1900       OS << "0b";
1901       for (unsigned j = 8; j--;) {
1902         unsigned Bit = (Code[i] >> j) & 1;
1903
1904         unsigned FixupBit;
1905         if (MAI->isLittleEndian())
1906           FixupBit = i * 8 + j;
1907         else
1908           FixupBit = i * 8 + (7-j);
1909
1910         if (uint8_t MapEntry = FixupMap[FixupBit]) {
1911           assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1912           OS << char('A' + MapEntry - 1);
1913         } else
1914           OS << Bit;
1915       }
1916     }
1917   }
1918   OS << "]\n";
1919
1920   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1921     MCFixup &F = Fixups[i];
1922     const MCFixupKindInfo &Info =
1923         getAssembler().getBackend().getFixupKindInfo(F.getKind());
1924     OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1925        << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1926   }
1927 }
1928
1929 void MCAsmStreamer::EmitInstruction(const MCInst &Inst,
1930                                     const MCSubtargetInfo &STI) {
1931   assert(getCurrentSectionOnly() &&
1932          "Cannot emit contents before setting section!");
1933
1934   // Show the encoding in a comment if we have a code emitter.
1935   AddEncodingComment(Inst, STI);
1936
1937   // Show the MCInst if enabled.
1938   if (ShowInst) {
1939     Inst.dump_pretty(GetCommentOS(), InstPrinter.get(), "\n ");
1940     GetCommentOS() << "\n";
1941   }
1942
1943   if(getTargetStreamer())
1944     getTargetStreamer()->prettyPrintAsm(*InstPrinter, OS, Inst, STI);
1945   else
1946     InstPrinter->printInst(&Inst, OS, "", STI);
1947
1948   StringRef Comments = CommentToEmit;
1949   if (Comments.size() && Comments.back() != '\n')
1950     GetCommentOS() << "\n";
1951
1952   EmitEOL();
1953 }
1954
1955 void MCAsmStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
1956   OS << "\t.bundle_align_mode " << AlignPow2;
1957   EmitEOL();
1958 }
1959
1960 void MCAsmStreamer::EmitBundleLock(bool AlignToEnd) {
1961   OS << "\t.bundle_lock";
1962   if (AlignToEnd)
1963     OS << " align_to_end";
1964   EmitEOL();
1965 }
1966
1967 void MCAsmStreamer::EmitBundleUnlock() {
1968   OS << "\t.bundle_unlock";
1969   EmitEOL();
1970 }
1971
1972 bool MCAsmStreamer::EmitRelocDirective(const MCExpr &Offset, StringRef Name,
1973                                        const MCExpr *Expr, SMLoc,
1974                                        const MCSubtargetInfo &STI) {
1975   OS << "\t.reloc ";
1976   Offset.print(OS, MAI);
1977   OS << ", " << Name;
1978   if (Expr) {
1979     OS << ", ";
1980     Expr->print(OS, MAI);
1981   }
1982   EmitEOL();
1983   return false;
1984 }
1985
1986 void MCAsmStreamer::EmitAddrsig() {
1987   OS << "\t.addrsig";
1988   EmitEOL();
1989 }
1990
1991 void MCAsmStreamer::EmitAddrsigSym(const MCSymbol *Sym) {
1992   OS << "\t.addrsig_sym ";
1993   Sym->print(OS, MAI);
1994   EmitEOL();
1995 }
1996
1997 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
1998 /// the specified string in the output .s file.  This capability is
1999 /// indicated by the hasRawTextSupport() predicate.
2000 void MCAsmStreamer::EmitRawTextImpl(StringRef String) {
2001   if (!String.empty() && String.back() == '\n')
2002     String = String.substr(0, String.size()-1);
2003   OS << String;
2004   EmitEOL();
2005 }
2006
2007 void MCAsmStreamer::FinishImpl() {
2008   // If we are generating dwarf for assembly source files dump out the sections.
2009   if (getContext().getGenDwarfForAssembly())
2010     MCGenDwarfInfo::Emit(this);
2011
2012   // Emit the label for the line table, if requested - since the rest of the
2013   // line table will be defined by .loc/.file directives, and not emitted
2014   // directly, the label is the only work required here.
2015   const auto &Tables = getContext().getMCDwarfLineTables();
2016   if (!Tables.empty()) {
2017     assert(Tables.size() == 1 && "asm output only supports one line table");
2018     if (auto *Label = Tables.begin()->second.getLabel()) {
2019       SwitchSection(getContext().getObjectFileInfo()->getDwarfLineSection());
2020       EmitLabel(Label);
2021     }
2022   }
2023 }
2024
2025 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
2026                                     std::unique_ptr<formatted_raw_ostream> OS,
2027                                     bool isVerboseAsm, bool useDwarfDirectory,
2028                                     MCInstPrinter *IP,
2029                                     std::unique_ptr<MCCodeEmitter> &&CE,
2030                                     std::unique_ptr<MCAsmBackend> &&MAB,
2031                                     bool ShowInst) {
2032   return new MCAsmStreamer(Context, std::move(OS), isVerboseAsm,
2033                            useDwarfDirectory, IP, std::move(CE), std::move(MAB),
2034                            ShowInst);
2035 }