lib/MC/MCAsmStreamer.cpp

   1 //===- lib/MC/MCAsmStreamer.cpp - Text Assembly Output --------------------===//
   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 #include "llvm/MC/MCStreamer.h"
  11 #include "llvm/MC/MCAsmInfo.h"
  12 #include "llvm/MC/MCCodeEmitter.h"
  13 #include "llvm/MC/MCContext.h"
  14 #include "llvm/MC/MCExpr.h"
  15 #include "llvm/MC/MCFixupKindInfo.h"
  16 #include "llvm/MC/MCInst.h"
  17 #include "llvm/MC/MCInstPrinter.h"
  18 #include "llvm/MC/MCSectionMachO.h"
  19 #include "llvm/MC/MCSymbol.h"
  20 #include "llvm/ADT/OwningPtr.h"
  21 #include "llvm/ADT/SmallString.h"
  22 #include "llvm/ADT/Twine.h"
  23 #include "llvm/Support/ErrorHandling.h"
  24 #include "llvm/Support/MathExtras.h"
  25 #include "llvm/Support/Format.h"
  26 #include "llvm/Support/FormattedStream.h"
  27 #include "llvm/Target/TargetAsmBackend.h"
  28 #include "llvm/Target/TargetAsmInfo.h"
  29 #include "llvm/Target/TargetLoweringObjectFile.h"
  30 #include <cctype>
  31 using namespace llvm;
  32
  33 namespace {
  34
  35 class MCAsmStreamer : public MCStreamer {
  36   formatted_raw_ostream &OS;
  37   const MCAsmInfo &MAI;
  38   OwningPtr<MCInstPrinter> InstPrinter;
  39   OwningPtr<MCCodeEmitter> Emitter;
  40   OwningPtr<TargetAsmBackend> AsmBackend;
  41
  42   SmallString<128> CommentToEmit;
  43   raw_svector_ostream CommentStream;
  44
  45   unsigned IsVerboseAsm : 1;
  46   unsigned ShowInst : 1;
  47   unsigned UseLoc : 1;
  48   unsigned UseCFI : 1;
  49
  50   enum EHSymbolFlags { EHGlobal         = 1,
  51                        EHWeakDefinition = 1 << 1,
  52                        EHPrivateExtern  = 1 << 2 };
  53   DenseMap<const MCSymbol*, unsigned> FlagMap;
  54
  55   bool needsSet(const MCExpr *Value);
  56
  57   void EmitRegisterName(int64_t Register);
  58
  59 public:
  60   MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
  61                 bool isVerboseAsm, bool useLoc, bool useCFI,
  62                 MCInstPrinter *printer, MCCodeEmitter *emitter,
  63                 TargetAsmBackend *asmbackend,
  64                 bool showInst)
  65     : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
  66       InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
  67       CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
  68       ShowInst(showInst), UseLoc(useLoc), UseCFI(useCFI) {
  69     if (InstPrinter && IsVerboseAsm)
  70       InstPrinter->setCommentStream(CommentStream);
  71   }
  72   ~MCAsmStreamer() {}
  73
  74   inline void EmitEOL() {
  75     // If we don't have any comments, just emit a \n.
  76     if (!IsVerboseAsm) {
  77       OS << '\n';
  78       return;
  79     }
  80     EmitCommentsAndEOL();
  81   }
  82   void EmitCommentsAndEOL();
  83
  84   /// isVerboseAsm - Return true if this streamer supports verbose assembly at
  85   /// all.
  86   virtual bool isVerboseAsm() const { return IsVerboseAsm; }
  87
  88   /// hasRawTextSupport - We support EmitRawText.
  89   virtual bool hasRawTextSupport() const { return true; }
  90
  91   /// AddComment - Add a comment that can be emitted to the generated .s
  92   /// file if applicable as a QoI issue to make the output of the compiler
  93   /// more readable.  This only affects the MCAsmStreamer, and only when
  94   /// verbose assembly output is enabled.
  95   virtual void AddComment(const Twine &T);
  96
  97   /// AddEncodingComment - Add a comment showing the encoding of an instruction.
  98   virtual void AddEncodingComment(const MCInst &Inst);
  99
 100   /// GetCommentOS - Return a raw_ostream that comments can be written to.
 101   /// Unlike AddComment, you are required to terminate comments with \n if you
 102   /// use this method.
 103   virtual raw_ostream &GetCommentOS() {
 104     if (!IsVerboseAsm)
 105       return nulls();  // Discard comments unless in verbose asm mode.
 106     return CommentStream;
 107   }
 108
 109   /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
 110   virtual void AddBlankLine() {
 111     EmitEOL();
 112   }
 113
 114   /// @name MCStreamer Interface
 115   /// @{
 116
 117   virtual void ChangeSection(const MCSection *Section);
 118
 119   virtual void InitSections() {
 120     // FIXME, this is MachO specific, but the testsuite
 121     // expects this.
 122     SwitchSection(getContext().getMachOSection("__TEXT", "__text",
 123                          MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 124                          0, SectionKind::getText()));
 125   }
 126
 127   virtual void EmitLabel(MCSymbol *Symbol);
 128   virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
 129                                    MCSymbol *EHSymbol);
 130   virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
 131   virtual void EmitThumbFunc(MCSymbol *Func);
 132
 133   virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
 134   virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
 135   virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
 136                                         const MCSymbol *LastLabel,
 137                                         const MCSymbol *Label);
 138   virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
 139                                          const MCSymbol *Label);
 140
 141   virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
 142
 143   virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
 144   virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
 145   virtual void EmitCOFFSymbolStorageClass(int StorageClass);
 146   virtual void EmitCOFFSymbolType(int Type);
 147   virtual void EndCOFFSymbolDef();
 148   virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
 149   virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
 150                                 unsigned ByteAlignment);
 151
 152   /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
 153   ///
 154   /// @param Symbol - The common symbol to emit.
 155   /// @param Size - The size of the common symbol.
 156   virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
 157
 158   virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
 159                             unsigned Size = 0, unsigned ByteAlignment = 0);
 160
 161   virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
 162                                uint64_t Size, unsigned ByteAlignment = 0);
 163
 164   virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
 165
 166   virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
 167                              unsigned AddrSpace);
 168   virtual void EmitIntValue(uint64_t Value, unsigned Size,
 169                             unsigned AddrSpace = 0);
 170
 171   virtual void EmitULEB128Value(const MCExpr *Value);
 172
 173   virtual void EmitSLEB128Value(const MCExpr *Value);
 174
 175   virtual void EmitGPRel32Value(const MCExpr *Value);
 176
 177
 178   virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
 179                         unsigned AddrSpace);
 180
 181   virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
 182                                     unsigned ValueSize = 1,
 183                                     unsigned MaxBytesToEmit = 0);
 184
 185   virtual void EmitCodeAlignment(unsigned ByteAlignment,
 186                                  unsigned MaxBytesToEmit = 0);
 187
 188   virtual void EmitValueToOffset(const MCExpr *Offset,
 189                                  unsigned char Value = 0);
 190
 191   virtual void EmitFileDirective(StringRef Filename);
 192   virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
 193   virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
 194                                      unsigned Column, unsigned Flags,
 195                                      unsigned Isa, unsigned Discriminator,
 196                                      StringRef FileName);
 197
 198   virtual void EmitCFISections(bool EH, bool Debug);
 199   virtual void EmitCFIStartProc();
 200   virtual void EmitCFIEndProc();
 201   virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
 202   virtual void EmitCFIDefCfaOffset(int64_t Offset);
 203   virtual void EmitCFIDefCfaRegister(int64_t Register);
 204   virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
 205   virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
 206   virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
 207   virtual void EmitCFIRememberState();
 208   virtual void EmitCFIRestoreState();
 209   virtual void EmitCFISameValue(int64_t Register);
 210   virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
 211   virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
 212
 213   virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
 214   virtual void EmitWin64EHEndProc();
 215   virtual void EmitWin64EHStartChained();
 216   virtual void EmitWin64EHEndChained();
 217   virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
 218                                   bool Except);
 219   virtual void EmitWin64EHHandlerData();
 220   virtual void EmitWin64EHPushReg(unsigned Register);
 221   virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset);
 222   virtual void EmitWin64EHAllocStack(unsigned Size);
 223   virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset);
 224   virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset);
 225   virtual void EmitWin64EHPushFrame(bool Code);
 226   virtual void EmitWin64EHEndProlog();
 227
 228   virtual void EmitFnStart();
 229   virtual void EmitFnEnd();
 230   virtual void EmitCantUnwind();
 231   virtual void EmitPersonality(const MCSymbol *Personality);
 232   virtual void EmitHandlerData();
 233   virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
 234   virtual void EmitPad(int64_t Offset);
 235   virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
 236
 237
 238   virtual void EmitInstruction(const MCInst &Inst);
 239
 240   /// EmitRawText - If this file is backed by an assembly streamer, this dumps
 241   /// the specified string in the output .s file.  This capability is
 242   /// indicated by the hasRawTextSupport() predicate.
 243   virtual void EmitRawText(StringRef String);
 244
 245   virtual void Finish();
 246
 247   /// @}
 248 };
 249
 250 } // end anonymous namespace.
 251
 252 /// AddComment - Add a comment that can be emitted to the generated .s
 253 /// file if applicable as a QoI issue to make the output of the compiler
 254 /// more readable.  This only affects the MCAsmStreamer, and only when
 255 /// verbose assembly output is enabled.
 256 void MCAsmStreamer::AddComment(const Twine &T) {
 257   if (!IsVerboseAsm) return;
 258
 259   // Make sure that CommentStream is flushed.
 260   CommentStream.flush();
 261
 262   T.toVector(CommentToEmit);
 263   // Each comment goes on its own line.
 264   CommentToEmit.push_back('\n');
 265
 266   // Tell the comment stream that the vector changed underneath it.
 267   CommentStream.resync();
 268 }
 269
 270 void MCAsmStreamer::EmitCommentsAndEOL() {
 271   if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
 272     OS << '\n';
 273     return;
 274   }
 275
 276   CommentStream.flush();
 277   StringRef Comments = CommentToEmit.str();
 278
 279   assert(Comments.back() == '\n' &&
 280          "Comment array not newline terminated");
 281   do {
 282     // Emit a line of comments.
 283     OS.PadToColumn(MAI.getCommentColumn());
 284     size_t Position = Comments.find('\n');
 285     OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
 286
 287     Comments = Comments.substr(Position+1);
 288   } while (!Comments.empty());
 289
 290   CommentToEmit.clear();
 291   // Tell the comment stream that the vector changed underneath it.
 292   CommentStream.resync();
 293 }
 294
 295 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
 296   assert(Bytes && "Invalid size!");
 297   return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
 298 }
 299
 300 void MCAsmStreamer::ChangeSection(const MCSection *Section) {
 301   assert(Section && "Cannot switch to a null section!");
 302   Section->PrintSwitchToSection(MAI, OS);
 303 }
 304
 305 void MCAsmStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
 306                                         MCSymbol *EHSymbol) {
 307   if (UseCFI)
 308     return;
 309
 310   unsigned Flags = FlagMap.lookup(Symbol);
 311
 312   if (Flags & EHGlobal)
 313     EmitSymbolAttribute(EHSymbol, MCSA_Global);
 314   if (Flags & EHWeakDefinition)
 315     EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
 316   if (Flags & EHPrivateExtern)
 317     EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
 318 }
 319
 320 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
 321   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
 322   MCStreamer::EmitLabel(Symbol);
 323
 324   OS << *Symbol << MAI.getLabelSuffix();
 325   EmitEOL();
 326 }
 327
 328 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
 329   switch (Flag) {
 330   default: assert(0 && "Invalid flag!");
 331   case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
 332   case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
 333   case MCAF_Code16:                OS << "\t.code\t16"; break;
 334   case MCAF_Code32:                OS << "\t.code\t32"; break;
 335   }
 336   EmitEOL();
 337 }
 338
 339 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
 340   // This needs to emit to a temporary string to get properly quoted
 341   // MCSymbols when they have spaces in them.
 342   OS << "\t.thumb_func";
 343   // Only Mach-O hasSubsectionsViaSymbols()
 344   if (MAI.hasSubsectionsViaSymbols())
 345     OS << '\t' << *Func;
 346   EmitEOL();
 347 }
 348
 349 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
 350   OS << *Symbol << " = " << *Value;
 351   EmitEOL();
 352
 353   // FIXME: Lift context changes into super class.
 354   Symbol->setVariableValue(Value);
 355 }
 356
 357 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
 358   OS << ".weakref " << *Alias << ", " << *Symbol;
 359   EmitEOL();
 360 }
 361
 362 void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
 363                                              const MCSymbol *LastLabel,
 364                                              const MCSymbol *Label) {
 365   EmitDwarfSetLineAddr(LineDelta, Label,
 366                        getContext().getTargetAsmInfo().getPointerSize());
 367 }
 368
 369 void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
 370                                               const MCSymbol *Label) {
 371   EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
 372   const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
 373   AddrDelta = ForceExpAbs(AddrDelta);
 374   EmitValue(AddrDelta, 4);
 375 }
 376
 377
 378 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
 379                                         MCSymbolAttr Attribute) {
 380   switch (Attribute) {
 381   case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
 382   case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
 383   case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
 384   case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
 385   case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
 386   case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
 387   case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
 388   case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
 389     assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
 390     OS << "\t.type\t" << *Symbol << ','
 391        << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
 392     switch (Attribute) {
 393     default: assert(0 && "Unknown ELF .type");
 394     case MCSA_ELF_TypeFunction:    OS << "function"; break;
 395     case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
 396     case MCSA_ELF_TypeObject:      OS << "object"; break;
 397     case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
 398     case MCSA_ELF_TypeCommon:      OS << "common"; break;
 399     case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
 400     case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
 401     }
 402     EmitEOL();
 403     return;
 404   case MCSA_Global: // .globl/.global
 405     OS << MAI.getGlobalDirective();
 406     FlagMap[Symbol] |= EHGlobal;
 407     break;
 408   case MCSA_Hidden:         OS << "\t.hidden\t";          break;
 409   case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
 410   case MCSA_Internal:       OS << "\t.internal\t";        break;
 411   case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
 412   case MCSA_Local:          OS << "\t.local\t";           break;
 413   case MCSA_NoDeadStrip:    OS << "\t.no_dead_strip\t";   break;
 414   case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
 415   case MCSA_PrivateExtern:
 416     OS << "\t.private_extern\t";
 417     FlagMap[Symbol] |= EHPrivateExtern;
 418     break;
 419   case MCSA_Protected:      OS << "\t.protected\t";       break;
 420   case MCSA_Reference:      OS << "\t.reference\t";       break;
 421   case MCSA_Weak:           OS << "\t.weak\t";            break;
 422   case MCSA_WeakDefinition:
 423     OS << "\t.weak_definition\t";
 424     FlagMap[Symbol] |= EHWeakDefinition;
 425     break;
 426       // .weak_reference
 427   case MCSA_WeakReference:  OS << MAI.getWeakRefDirective(); break;
 428   case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
 429   }
 430
 431   OS << *Symbol;
 432   EmitEOL();
 433 }
 434
 435 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
 436   OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
 437   EmitEOL();
 438 }
 439
 440 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
 441   OS << "\t.def\t " << *Symbol << ';';
 442   EmitEOL();
 443 }
 444
 445 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
 446   OS << "\t.scl\t" << StorageClass << ';';
 447   EmitEOL();
 448 }
 449
 450 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
 451   OS << "\t.type\t" << Type << ';';
 452   EmitEOL();
 453 }
 454
 455 void MCAsmStreamer::EndCOFFSymbolDef() {
 456   OS << "\t.endef";
 457   EmitEOL();
 458 }
 459
 460 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
 461   assert(MAI.hasDotTypeDotSizeDirective());
 462   OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
 463 }
 464
 465 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
 466                                      unsigned ByteAlignment) {
 467   OS << "\t.comm\t" << *Symbol << ',' << Size;
 468   if (ByteAlignment != 0) {
 469     if (MAI.getCOMMDirectiveAlignmentIsInBytes())
 470       OS << ',' << ByteAlignment;
 471     else
 472       OS << ',' << Log2_32(ByteAlignment);
 473   }
 474   EmitEOL();
 475 }
 476
 477 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
 478 ///
 479 /// @param Symbol - The common symbol to emit.
 480 /// @param Size - The size of the common symbol.
 481 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
 482   assert(MAI.hasLCOMMDirective() && "Doesn't have .lcomm, can't emit it!");
 483   OS << "\t.lcomm\t" << *Symbol << ',' << Size;
 484   EmitEOL();
 485 }
 486
 487 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
 488                                  unsigned Size, unsigned ByteAlignment) {
 489   // Note: a .zerofill directive does not switch sections.
 490   OS << ".zerofill ";
 491
 492   // This is a mach-o specific directive.
 493   const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
 494   OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
 495
 496   if (Symbol != NULL) {
 497     OS << ',' << *Symbol << ',' << Size;
 498     if (ByteAlignment != 0)
 499       OS << ',' << Log2_32(ByteAlignment);
 500   }
 501   EmitEOL();
 502 }
 503
 504 // .tbss sym, size, align
 505 // This depends that the symbol has already been mangled from the original,
 506 // e.g. _a.
 507 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
 508                                    uint64_t Size, unsigned ByteAlignment) {
 509   assert(Symbol != NULL && "Symbol shouldn't be NULL!");
 510   // Instead of using the Section we'll just use the shortcut.
 511   // This is a mach-o specific directive and section.
 512   OS << ".tbss " << *Symbol << ", " << Size;
 513
 514   // Output align if we have it.  We default to 1 so don't bother printing
 515   // that.
 516   if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
 517
 518   EmitEOL();
 519 }
 520
 521 static inline char toOctal(int X) { return (X&7)+'0'; }
 522
 523 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
 524   OS << '"';
 525
 526   for (unsigned i = 0, e = Data.size(); i != e; ++i) {
 527     unsigned char C = Data[i];
 528     if (C == '"' || C == '\\') {
 529       OS << '\\' << (char)C;
 530       continue;
 531     }
 532
 533     if (isprint((unsigned char)C)) {
 534       OS << (char)C;
 535       continue;
 536     }
 537
 538     switch (C) {
 539       case '\b': OS << "\\b"; break;
 540       case '\f': OS << "\\f"; break;
 541       case '\n': OS << "\\n"; break;
 542       case '\r': OS << "\\r"; break;
 543       case '\t': OS << "\\t"; break;
 544       default:
 545         OS << '\\';
 546         OS << toOctal(C >> 6);
 547         OS << toOctal(C >> 3);
 548         OS << toOctal(C >> 0);
 549         break;
 550     }
 551   }
 552
 553   OS << '"';
 554 }
 555
 556
 557 void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
 558   assert(getCurrentSection() && "Cannot emit contents before setting section!");
 559   if (Data.empty()) return;
 560
 561   if (Data.size() == 1) {
 562     OS << MAI.getData8bitsDirective(AddrSpace);
 563     OS << (unsigned)(unsigned char)Data[0];
 564     EmitEOL();
 565     return;
 566   }
 567
 568   // If the data ends with 0 and the target supports .asciz, use it, otherwise
 569   // use .ascii
 570   if (MAI.getAscizDirective() && Data.back() == 0) {
 571     OS << MAI.getAscizDirective();
 572     Data = Data.substr(0, Data.size()-1);
 573   } else {
 574     OS << MAI.getAsciiDirective();
 575   }
 576
 577   OS << ' ';
 578   PrintQuotedString(Data, OS);
 579   EmitEOL();
 580 }
 581
 582 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
 583                                  unsigned AddrSpace) {
 584   EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
 585 }
 586
 587 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
 588                                   unsigned AddrSpace) {
 589   assert(getCurrentSection() && "Cannot emit contents before setting section!");
 590   const char *Directive = 0;
 591   switch (Size) {
 592   default: break;
 593   case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
 594   case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
 595   case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
 596   case 8:
 597     Directive = MAI.getData64bitsDirective(AddrSpace);
 598     // If the target doesn't support 64-bit data, emit as two 32-bit halves.
 599     if (Directive) break;
 600     int64_t IntValue;
 601     if (!Value->EvaluateAsAbsolute(IntValue))
 602       report_fatal_error("Don't know how to emit this value.");
 603     if (getContext().getTargetAsmInfo().isLittleEndian()) {
 604       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
 605       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
 606     } else {
 607       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
 608       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
 609     }
 610     return;
 611   }
 612
 613   assert(Directive && "Invalid size for machine code value!");
 614   OS << Directive << *Value;
 615   EmitEOL();
 616 }
 617
 618 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
 619   int64_t IntValue;
 620   if (Value->EvaluateAsAbsolute(IntValue)) {
 621     EmitULEB128IntValue(IntValue);
 622     return;
 623   }
 624   assert(MAI.hasLEB128() && "Cannot print a .uleb");
 625   OS << ".uleb128 " << *Value;
 626   EmitEOL();
 627 }
 628
 629 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
 630   int64_t IntValue;
 631   if (Value->EvaluateAsAbsolute(IntValue)) {
 632     EmitSLEB128IntValue(IntValue);
 633     return;
 634   }
 635   assert(MAI.hasLEB128() && "Cannot print a .sleb");
 636   OS << ".sleb128 " << *Value;
 637   EmitEOL();
 638 }
 639
 640 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
 641   assert(MAI.getGPRel32Directive() != 0);
 642   OS << MAI.getGPRel32Directive() << *Value;
 643   EmitEOL();
 644 }
 645
 646
 647 /// EmitFill - Emit NumBytes bytes worth of the value specified by
 648 /// FillValue.  This implements directives such as '.space'.
 649 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
 650                              unsigned AddrSpace) {
 651   if (NumBytes == 0) return;
 652
 653   if (AddrSpace == 0)
 654     if (const char *ZeroDirective = MAI.getZeroDirective()) {
 655       OS << ZeroDirective << NumBytes;
 656       if (FillValue != 0)
 657         OS << ',' << (int)FillValue;
 658       EmitEOL();
 659       return;
 660     }
 661
 662   // Emit a byte at a time.
 663   MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
 664 }
 665
 666 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
 667                                          unsigned ValueSize,
 668                                          unsigned MaxBytesToEmit) {
 669   // Some assemblers don't support non-power of two alignments, so we always
 670   // emit alignments as a power of two if possible.
 671   if (isPowerOf2_32(ByteAlignment)) {
 672     switch (ValueSize) {
 673     default: llvm_unreachable("Invalid size for machine code value!");
 674     case 1: OS << MAI.getAlignDirective(); break;
 675     // FIXME: use MAI for this!
 676     case 2: OS << ".p2alignw "; break;
 677     case 4: OS << ".p2alignl "; break;
 678     case 8: llvm_unreachable("Unsupported alignment size!");
 679     }
 680
 681     if (MAI.getAlignmentIsInBytes())
 682       OS << ByteAlignment;
 683     else
 684       OS << Log2_32(ByteAlignment);
 685
 686     if (Value || MaxBytesToEmit) {
 687       OS << ", 0x";
 688       OS.write_hex(truncateToSize(Value, ValueSize));
 689
 690       if (MaxBytesToEmit)
 691         OS << ", " << MaxBytesToEmit;
 692     }
 693     EmitEOL();
 694     return;
 695   }
 696
 697   // Non-power of two alignment.  This is not widely supported by assemblers.
 698   // FIXME: Parameterize this based on MAI.
 699   switch (ValueSize) {
 700   default: llvm_unreachable("Invalid size for machine code value!");
 701   case 1: OS << ".balign";  break;
 702   case 2: OS << ".balignw"; break;
 703   case 4: OS << ".balignl"; break;
 704   case 8: llvm_unreachable("Unsupported alignment size!");
 705   }
 706
 707   OS << ' ' << ByteAlignment;
 708   OS << ", " << truncateToSize(Value, ValueSize);
 709   if (MaxBytesToEmit)
 710     OS << ", " << MaxBytesToEmit;
 711   EmitEOL();
 712 }
 713
 714 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
 715                                       unsigned MaxBytesToEmit) {
 716   // Emit with a text fill value.
 717   EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
 718                        1, MaxBytesToEmit);
 719 }
 720
 721 void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
 722                                       unsigned char Value) {
 723   // FIXME: Verify that Offset is associated with the current section.
 724   OS << ".org " << *Offset << ", " << (unsigned) Value;
 725   EmitEOL();
 726 }
 727
 728
 729 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
 730   assert(MAI.hasSingleParameterDotFile());
 731   OS << "\t.file\t";
 732   PrintQuotedString(Filename, OS);
 733   EmitEOL();
 734 }
 735
 736 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
 737   if (UseLoc) {
 738     OS << "\t.file\t" << FileNo << ' ';
 739     PrintQuotedString(Filename, OS);
 740     EmitEOL();
 741   }
 742   return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
 743 }
 744
 745 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
 746                                           unsigned Column, unsigned Flags,
 747                                           unsigned Isa,
 748                                           unsigned Discriminator,
 749                                           StringRef FileName) {
 750   this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
 751                                           Isa, Discriminator, FileName);
 752   if (!UseLoc)
 753     return;
 754
 755   OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
 756   if (Flags & DWARF2_FLAG_BASIC_BLOCK)
 757     OS << " basic_block";
 758   if (Flags & DWARF2_FLAG_PROLOGUE_END)
 759     OS << " prologue_end";
 760   if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
 761     OS << " epilogue_begin";
 762
 763   unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
 764   if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
 765     OS << " is_stmt ";
 766
 767     if (Flags & DWARF2_FLAG_IS_STMT)
 768       OS << "1";
 769     else
 770       OS << "0";
 771   }
 772
 773   if (Isa)
 774     OS << "isa " << Isa;
 775   if (Discriminator)
 776     OS << "discriminator " << Discriminator;
 777
 778   if (IsVerboseAsm) {
 779     OS.PadToColumn(MAI.getCommentColumn());
 780     OS << MAI.getCommentString() << ' ' << FileName << ':'
 781        << Line << ':' << Column;
 782   }
 783   EmitEOL();
 784 }
 785
 786 void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
 787   MCStreamer::EmitCFISections(EH, Debug);
 788
 789   if (!UseCFI)
 790     return;
 791
 792   OS << "\t.cfi_sections ";
 793   if (EH) {
 794     OS << ".eh_frame";
 795     if (Debug)
 796       OS << ", .debug_frame";
 797   } else if (Debug) {
 798     OS << ".debug_frame";
 799   }
 800
 801   EmitEOL();
 802 }
 803
 804 void MCAsmStreamer::EmitCFIStartProc() {
 805   MCStreamer::EmitCFIStartProc();
 806
 807   if (!UseCFI)
 808     return;
 809
 810   OS << "\t.cfi_startproc";
 811   EmitEOL();
 812 }
 813
 814 void MCAsmStreamer::EmitCFIEndProc() {
 815   MCStreamer::EmitCFIEndProc();
 816
 817   if (!UseCFI)
 818     return;
 819
 820   OS << "\t.cfi_endproc";
 821   EmitEOL();
 822 }
 823
 824 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
 825   if (InstPrinter) {
 826     const TargetAsmInfo &asmInfo = getContext().getTargetAsmInfo();
 827     unsigned LLVMRegister = asmInfo.getLLVMRegNum(Register, true);
 828     InstPrinter->printRegName(OS, LLVMRegister);
 829   } else {
 830     OS << Register;
 831   }
 832 }
 833
 834 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
 835   MCStreamer::EmitCFIDefCfa(Register, Offset);
 836
 837   if (!UseCFI)
 838     return;
 839
 840   OS << "\t.cfi_def_cfa ";
 841   EmitRegisterName(Register);
 842   OS << ", " << Offset;
 843   EmitEOL();
 844 }
 845
 846 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
 847   MCStreamer::EmitCFIDefCfaOffset(Offset);
 848
 849   if (!UseCFI)
 850     return;
 851
 852   OS << "\t.cfi_def_cfa_offset " << Offset;
 853   EmitEOL();
 854 }
 855
 856 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
 857   MCStreamer::EmitCFIDefCfaRegister(Register);
 858
 859   if (!UseCFI)
 860     return;
 861
 862   OS << "\t.cfi_def_cfa_register ";
 863   EmitRegisterName(Register);
 864   EmitEOL();
 865 }
 866
 867 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
 868   this->MCStreamer::EmitCFIOffset(Register, Offset);
 869
 870   if (!UseCFI)
 871     return;
 872
 873   OS << "\t.cfi_offset ";
 874   EmitRegisterName(Register);
 875   OS << ", " << Offset;
 876   EmitEOL();
 877 }
 878
 879 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
 880                                        unsigned Encoding) {
 881   MCStreamer::EmitCFIPersonality(Sym, Encoding);
 882
 883   if (!UseCFI)
 884     return;
 885
 886   OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
 887   EmitEOL();
 888 }
 889
 890 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
 891   MCStreamer::EmitCFILsda(Sym, Encoding);
 892
 893   if (!UseCFI)
 894     return;
 895
 896   OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
 897   EmitEOL();
 898 }
 899
 900 void MCAsmStreamer::EmitCFIRememberState() {
 901   MCStreamer::EmitCFIRememberState();
 902
 903   if (!UseCFI)
 904     return;
 905
 906   OS << "\t.cfi_remember_state";
 907   EmitEOL();
 908 }
 909
 910 void MCAsmStreamer::EmitCFIRestoreState() {
 911   MCStreamer::EmitCFIRestoreState();
 912
 913   if (!UseCFI)
 914     return;
 915
 916   OS << "\t.cfi_restore_state";
 917   EmitEOL();
 918 }
 919
 920 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
 921   MCStreamer::EmitCFISameValue(Register);
 922
 923   if (!UseCFI)
 924     return;
 925
 926   OS << "\t.cfi_same_value ";
 927   EmitRegisterName(Register);
 928   EmitEOL();
 929 }
 930
 931 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
 932   MCStreamer::EmitCFIRelOffset(Register, Offset);
 933
 934   if (!UseCFI)
 935     return;
 936
 937   OS << "\t.cfi_rel_offset ";
 938   EmitRegisterName(Register);
 939   OS << ", " << Offset;
 940   EmitEOL();
 941 }
 942
 943 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
 944   MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
 945
 946   if (!UseCFI)
 947     return;
 948
 949   OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
 950   EmitEOL();
 951 }
 952
 953 void MCAsmStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
 954   MCStreamer::EmitWin64EHStartProc(Symbol);
 955
 956   OS << ".seh_proc " << *Symbol;
 957   EmitEOL();
 958 }
 959
 960 void MCAsmStreamer::EmitWin64EHEndProc() {
 961   MCStreamer::EmitWin64EHEndProc();
 962
 963   OS << "\t.seh_endproc";
 964   EmitEOL();
 965 }
 966
 967 void MCAsmStreamer::EmitWin64EHStartChained() {
 968   MCStreamer::EmitWin64EHStartChained();
 969
 970   OS << "\t.seh_startchained";
 971   EmitEOL();
 972 }
 973
 974 void MCAsmStreamer::EmitWin64EHEndChained() {
 975   MCStreamer::EmitWin64EHEndChained();
 976
 977   OS << "\t.seh_endchained";
 978   EmitEOL();
 979 }
 980
 981 void MCAsmStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
 982                                        bool Except) {
 983   MCStreamer::EmitWin64EHHandler(Sym, Unwind, Except);
 984
 985   OS << "\t.seh_handler " << *Sym;
 986   if (Unwind)
 987     OS << ", @unwind";
 988   if (Except)
 989     OS << ", @except";
 990   EmitEOL();
 991 }
 992
 993 void MCAsmStreamer::EmitWin64EHHandlerData() {
 994   MCStreamer::EmitWin64EHHandlerData();
 995
 996   // Switch sections. Don't call SwitchSection directly, because that will
 997   // cause the section switch to be visible in the emitted assembly.
 998   // We only do this so the section switch that terminates the handler
 999   // data block is visible.
1000   MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
1001   StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
1002   const MCSection *xdataSect =
1003     getContext().getTargetAsmInfo().getWin64EHTableSection(suffix);
1004   if (xdataSect)
1005     SwitchSectionNoChange(xdataSect);
1006
1007   OS << "\t.seh_handlerdata";
1008   EmitEOL();
1009 }
1010
1011 void MCAsmStreamer::EmitWin64EHPushReg(unsigned Register) {
1012   MCStreamer::EmitWin64EHPushReg(Register);
1013
1014   OS << "\t.seh_pushreg " << Register;
1015   EmitEOL();
1016 }
1017
1018 void MCAsmStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
1019   MCStreamer::EmitWin64EHSetFrame(Register, Offset);
1020
1021   OS << "\t.seh_setframe " << Register << ", " << Offset;
1022   EmitEOL();
1023 }
1024
1025 void MCAsmStreamer::EmitWin64EHAllocStack(unsigned Size) {
1026   MCStreamer::EmitWin64EHAllocStack(Size);
1027
1028   OS << "\t.seh_stackalloc " << Size;
1029   EmitEOL();
1030 }
1031
1032 void MCAsmStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
1033   MCStreamer::EmitWin64EHSaveReg(Register, Offset);
1034
1035   OS << "\t.seh_savereg " << Register << ", " << Offset;
1036   EmitEOL();
1037 }
1038
1039 void MCAsmStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
1040   MCStreamer::EmitWin64EHSaveXMM(Register, Offset);
1041
1042   OS << "\t.seh_savexmm " << Register << ", " << Offset;
1043   EmitEOL();
1044 }
1045
1046 void MCAsmStreamer::EmitWin64EHPushFrame(bool Code) {
1047   MCStreamer::EmitWin64EHPushFrame(Code);
1048
1049   OS << "\t.seh_pushframe";
1050   if (Code)
1051     OS << " @code";
1052   EmitEOL();
1053 }
1054
1055 void MCAsmStreamer::EmitWin64EHEndProlog(void) {
1056   MCStreamer::EmitWin64EHEndProlog();
1057
1058   OS << "\t.seh_endprologue";
1059   EmitEOL();
1060 }
1061
1062 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
1063   raw_ostream &OS = GetCommentOS();
1064   SmallString<256> Code;
1065   SmallVector<MCFixup, 4> Fixups;
1066   raw_svector_ostream VecOS(Code);
1067   Emitter->EncodeInstruction(Inst, VecOS, Fixups);
1068   VecOS.flush();
1069
1070   // If we are showing fixups, create symbolic markers in the encoded
1071   // representation. We do this by making a per-bit map to the fixup item index,
1072   // then trying to display it as nicely as possible.
1073   SmallVector<uint8_t, 64> FixupMap;
1074   FixupMap.resize(Code.size() * 8);
1075   for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1076     FixupMap[i] = 0;
1077
1078   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1079     MCFixup &F = Fixups[i];
1080     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1081     for (unsigned j = 0; j != Info.TargetSize; ++j) {
1082       unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1083       assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1084       FixupMap[Index] = 1 + i;
1085     }
1086   }
1087
1088   // FIXME: Node the fixup comments for Thumb2 are completely bogus since the
1089   // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1090   OS << "encoding: [";
1091   for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1092     if (i)
1093       OS << ',';
1094
1095     // See if all bits are the same map entry.
1096     uint8_t MapEntry = FixupMap[i * 8 + 0];
1097     for (unsigned j = 1; j != 8; ++j) {
1098       if (FixupMap[i * 8 + j] == MapEntry)
1099         continue;
1100
1101       MapEntry = uint8_t(~0U);
1102       break;
1103     }
1104
1105     if (MapEntry != uint8_t(~0U)) {
1106       if (MapEntry == 0) {
1107         OS << format("0x%02x", uint8_t(Code[i]));
1108       } else {
1109         if (Code[i]) {
1110           // FIXME: Some of the 8 bits require fix up.
1111           OS << format("0x%02x", uint8_t(Code[i])) << '\''
1112              << char('A' + MapEntry - 1) << '\'';
1113         } else
1114           OS << char('A' + MapEntry - 1);
1115       }
1116     } else {
1117       // Otherwise, write out in binary.
1118       OS << "0b";
1119       for (unsigned j = 8; j--;) {
1120         unsigned Bit = (Code[i] >> j) & 1;
1121
1122         unsigned FixupBit;
1123         if (getContext().getTargetAsmInfo().isLittleEndian())
1124           FixupBit = i * 8 + j;
1125         else
1126           FixupBit = i * 8 + (7-j);
1127
1128         if (uint8_t MapEntry = FixupMap[FixupBit]) {
1129           assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1130           OS << char('A' + MapEntry - 1);
1131         } else
1132           OS << Bit;
1133       }
1134     }
1135   }
1136   OS << "]\n";
1137
1138   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1139     MCFixup &F = Fixups[i];
1140     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1141     OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1142        << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1143   }
1144 }
1145
1146 void MCAsmStreamer::EmitFnStart() {
1147   OS << "\t.fnstart";
1148   EmitEOL();
1149 }
1150
1151 void MCAsmStreamer::EmitFnEnd() {
1152   OS << "\t.fnend";
1153   EmitEOL();
1154 }
1155
1156 void MCAsmStreamer::EmitCantUnwind() {
1157   OS << "\t.cantunwind";
1158   EmitEOL();
1159 }
1160
1161 void MCAsmStreamer::EmitHandlerData() {
1162   OS << "\t.handlerdata";
1163   EmitEOL();
1164 }
1165
1166 void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
1167   OS << "\t.personality " << Personality->getName();
1168   EmitEOL();
1169 }
1170
1171 void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
1172   OS << "\t.setfp\t";
1173   InstPrinter->printRegName(OS, FpReg);
1174   OS << ", ";
1175   InstPrinter->printRegName(OS, SpReg);
1176   if (Offset)
1177     OS << ", #" << Offset;
1178   EmitEOL();
1179 }
1180
1181 void MCAsmStreamer::EmitPad(int64_t Offset) {
1182   OS << "\t.pad\t#" << Offset;
1183   EmitEOL();
1184 }
1185
1186 void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
1187                                 bool isVector) {
1188   assert(RegList.size() && "RegList should not be empty");
1189   if (isVector)
1190     OS << "\t.vsave\t{";
1191   else
1192     OS << "\t.save\t{";
1193
1194   InstPrinter->printRegName(OS, RegList[0]);
1195
1196   for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
1197     OS << ", ";
1198     InstPrinter->printRegName(OS, RegList[i]);
1199   }
1200
1201   OS << "}";
1202   EmitEOL();
1203 }
1204
1205 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
1206   assert(getCurrentSection() && "Cannot emit contents before setting section!");
1207
1208   // Show the encoding in a comment if we have a code emitter.
1209   if (Emitter)
1210     AddEncodingComment(Inst);
1211
1212   // Show the MCInst if enabled.
1213   if (ShowInst) {
1214     Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
1215     GetCommentOS() << "\n";
1216   }
1217
1218   // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
1219   if (InstPrinter)
1220     InstPrinter->printInst(&Inst, OS);
1221   else
1222     Inst.print(OS, &MAI);
1223   EmitEOL();
1224 }
1225
1226 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
1227 /// the specified string in the output .s file.  This capability is
1228 /// indicated by the hasRawTextSupport() predicate.
1229 void MCAsmStreamer::EmitRawText(StringRef String) {
1230   if (!String.empty() && String.back() == '\n')
1231     String = String.substr(0, String.size()-1);
1232   OS << String;
1233   EmitEOL();
1234 }
1235
1236 void MCAsmStreamer::Finish() {
1237   // Dump out the dwarf file & directory tables and line tables.
1238   if (getContext().hasDwarfFiles() && !UseLoc)
1239     MCDwarfFileTable::Emit(this);
1240
1241   if (!UseCFI)
1242     EmitFrames(false);
1243 }
1244
1245 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1246                                     formatted_raw_ostream &OS,
1247                                     bool isVerboseAsm, bool useLoc,
1248                                     bool useCFI,
1249                                     MCInstPrinter *IP, MCCodeEmitter *CE,
1250                                     TargetAsmBackend *TAB, bool ShowInst) {
1251   return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc, useCFI,
1252                            IP, CE, TAB, ShowInst);
1253 }