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/StringExtras.h"
  23 #include "llvm/ADT/Twine.h"
  24 #include "llvm/Support/ErrorHandling.h"
  25 #include "llvm/Support/MathExtras.h"
  26 #include "llvm/Support/Format.h"
  27 #include "llvm/Support/FormattedStream.h"
  28 #include "llvm/Target/TargetAsmBackend.h"
  29 #include "llvm/Target/TargetAsmInfo.h"
  30 #include "llvm/Target/TargetLoweringObjectFile.h"
  31 #include <cctype>
  32 using namespace llvm;
  33
  34 namespace {
  35
  36 class MCAsmStreamer : public MCStreamer {
  37 protected:
  38   formatted_raw_ostream &OS;
  39   const MCAsmInfo &MAI;
  40 private:
  41   OwningPtr<MCInstPrinter> InstPrinter;
  42   OwningPtr<MCCodeEmitter> Emitter;
  43   OwningPtr<TargetAsmBackend> AsmBackend;
  44
  45   SmallString<128> CommentToEmit;
  46   raw_svector_ostream CommentStream;
  47
  48   unsigned IsVerboseAsm : 1;
  49   unsigned ShowInst : 1;
  50   unsigned UseLoc : 1;
  51   unsigned UseCFI : 1;
  52
  53   enum EHSymbolFlags { EHGlobal         = 1,
  54                        EHWeakDefinition = 1 << 1,
  55                        EHPrivateExtern  = 1 << 2 };
  56   DenseMap<const MCSymbol*, unsigned> FlagMap;
  57
  58   bool needsSet(const MCExpr *Value);
  59
  60   void EmitRegisterName(int64_t Register);
  61
  62 public:
  63   MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
  64                 bool isVerboseAsm, bool useLoc, bool useCFI,
  65                 MCInstPrinter *printer, MCCodeEmitter *emitter,
  66                 TargetAsmBackend *asmbackend,
  67                 bool showInst)
  68     : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
  69       InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
  70       CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
  71       ShowInst(showInst), UseLoc(useLoc), UseCFI(useCFI) {
  72     if (InstPrinter && IsVerboseAsm)
  73       InstPrinter->setCommentStream(CommentStream);
  74   }
  75   ~MCAsmStreamer() {}
  76
  77   inline void EmitEOL() {
  78     // If we don't have any comments, just emit a \n.
  79     if (!IsVerboseAsm) {
  80       OS << '\n';
  81       return;
  82     }
  83     EmitCommentsAndEOL();
  84   }
  85   void EmitCommentsAndEOL();
  86
  87   /// isVerboseAsm - Return true if this streamer supports verbose assembly at
  88   /// all.
  89   virtual bool isVerboseAsm() const { return IsVerboseAsm; }
  90
  91   /// hasRawTextSupport - We support EmitRawText.
  92   virtual bool hasRawTextSupport() const { return true; }
  93
  94   /// AddComment - Add a comment that can be emitted to the generated .s
  95   /// file if applicable as a QoI issue to make the output of the compiler
  96   /// more readable.  This only affects the MCAsmStreamer, and only when
  97   /// verbose assembly output is enabled.
  98   virtual void AddComment(const Twine &T);
  99
 100   /// AddEncodingComment - Add a comment showing the encoding of an instruction.
 101   virtual void AddEncodingComment(const MCInst &Inst);
 102
 103   /// GetCommentOS - Return a raw_ostream that comments can be written to.
 104   /// Unlike AddComment, you are required to terminate comments with \n if you
 105   /// use this method.
 106   virtual raw_ostream &GetCommentOS() {
 107     if (!IsVerboseAsm)
 108       return nulls();  // Discard comments unless in verbose asm mode.
 109     return CommentStream;
 110   }
 111
 112   /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
 113   virtual void AddBlankLine() {
 114     EmitEOL();
 115   }
 116
 117   /// @name MCStreamer Interface
 118   /// @{
 119
 120   virtual void ChangeSection(const MCSection *Section);
 121
 122   virtual void InitSections() {
 123     // FIXME, this is MachO specific, but the testsuite
 124     // expects this.
 125     SwitchSection(getContext().getMachOSection("__TEXT", "__text",
 126                          MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 127                          0, SectionKind::getText()));
 128   }
 129
 130   virtual void EmitLabel(MCSymbol *Symbol);
 131   virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
 132                                    MCSymbol *EHSymbol);
 133   virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
 134   virtual void EmitThumbFunc(MCSymbol *Func);
 135
 136   virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
 137   virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
 138   virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
 139                                         const MCSymbol *LastLabel,
 140                                         const MCSymbol *Label);
 141   virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
 142                                          const MCSymbol *Label);
 143
 144   virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
 145
 146   virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
 147   virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
 148   virtual void EmitCOFFSymbolStorageClass(int StorageClass);
 149   virtual void EmitCOFFSymbolType(int Type);
 150   virtual void EndCOFFSymbolDef();
 151   virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
 152   virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
 153                                 unsigned ByteAlignment);
 154
 155   /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
 156   ///
 157   /// @param Symbol - The common symbol to emit.
 158   /// @param Size - The size of the common symbol.
 159   virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
 160
 161   virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
 162                             unsigned Size = 0, unsigned ByteAlignment = 0);
 163
 164   virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
 165                                uint64_t Size, unsigned ByteAlignment = 0);
 166
 167   virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
 168
 169   virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
 170                              unsigned AddrSpace);
 171   virtual void EmitIntValue(uint64_t Value, unsigned Size,
 172                             unsigned AddrSpace = 0);
 173
 174   virtual void EmitULEB128Value(const MCExpr *Value);
 175
 176   virtual void EmitSLEB128Value(const MCExpr *Value);
 177
 178   virtual void EmitGPRel32Value(const MCExpr *Value);
 179
 180
 181   virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
 182                         unsigned AddrSpace);
 183
 184   virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
 185                                     unsigned ValueSize = 1,
 186                                     unsigned MaxBytesToEmit = 0);
 187
 188   virtual void EmitCodeAlignment(unsigned ByteAlignment,
 189                                  unsigned MaxBytesToEmit = 0);
 190
 191   virtual void EmitValueToOffset(const MCExpr *Offset,
 192                                  unsigned char Value = 0);
 193
 194   virtual void EmitFileDirective(StringRef Filename);
 195   virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
 196   virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
 197                                      unsigned Column, unsigned Flags,
 198                                      unsigned Isa, unsigned Discriminator,
 199                                      StringRef FileName);
 200
 201   virtual void EmitCFISections(bool EH, bool Debug);
 202   virtual void EmitCFIStartProc();
 203   virtual void EmitCFIEndProc();
 204   virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
 205   virtual void EmitCFIDefCfaOffset(int64_t Offset);
 206   virtual void EmitCFIDefCfaRegister(int64_t Register);
 207   virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
 208   virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
 209   virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
 210   virtual void EmitCFIRememberState();
 211   virtual void EmitCFIRestoreState();
 212   virtual void EmitCFISameValue(int64_t Register);
 213   virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
 214   virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
 215
 216   virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
 217   virtual void EmitWin64EHEndProc();
 218   virtual void EmitWin64EHStartChained();
 219   virtual void EmitWin64EHEndChained();
 220   virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
 221                                   bool Except);
 222   virtual void EmitWin64EHHandlerData();
 223   virtual void EmitWin64EHPushReg(unsigned Register);
 224   virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset);
 225   virtual void EmitWin64EHAllocStack(unsigned Size);
 226   virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset);
 227   virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset);
 228   virtual void EmitWin64EHPushFrame(bool Code);
 229   virtual void EmitWin64EHEndProlog();
 230
 231   virtual void EmitFnStart();
 232   virtual void EmitFnEnd();
 233   virtual void EmitCantUnwind();
 234   virtual void EmitPersonality(const MCSymbol *Personality);
 235   virtual void EmitHandlerData();
 236   virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
 237   virtual void EmitPad(int64_t Offset);
 238   virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
 239
 240
 241   virtual void EmitInstruction(const MCInst &Inst);
 242
 243   /// EmitRawText - If this file is backed by an assembly streamer, this dumps
 244   /// the specified string in the output .s file.  This capability is
 245   /// indicated by the hasRawTextSupport() predicate.
 246   virtual void EmitRawText(StringRef String);
 247
 248   virtual void Finish();
 249
 250   /// @}
 251 };
 252
 253 } // end anonymous namespace.
 254
 255 /// AddComment - Add a comment that can be emitted to the generated .s
 256 /// file if applicable as a QoI issue to make the output of the compiler
 257 /// more readable.  This only affects the MCAsmStreamer, and only when
 258 /// verbose assembly output is enabled.
 259 void MCAsmStreamer::AddComment(const Twine &T) {
 260   if (!IsVerboseAsm) return;
 261
 262   // Make sure that CommentStream is flushed.
 263   CommentStream.flush();
 264
 265   T.toVector(CommentToEmit);
 266   // Each comment goes on its own line.
 267   CommentToEmit.push_back('\n');
 268
 269   // Tell the comment stream that the vector changed underneath it.
 270   CommentStream.resync();
 271 }
 272
 273 void MCAsmStreamer::EmitCommentsAndEOL() {
 274   if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
 275     OS << '\n';
 276     return;
 277   }
 278
 279   CommentStream.flush();
 280   StringRef Comments = CommentToEmit.str();
 281
 282   assert(Comments.back() == '\n' &&
 283          "Comment array not newline terminated");
 284   do {
 285     // Emit a line of comments.
 286     OS.PadToColumn(MAI.getCommentColumn());
 287     size_t Position = Comments.find('\n');
 288     OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
 289
 290     Comments = Comments.substr(Position+1);
 291   } while (!Comments.empty());
 292
 293   CommentToEmit.clear();
 294   // Tell the comment stream that the vector changed underneath it.
 295   CommentStream.resync();
 296 }
 297
 298 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
 299   assert(Bytes && "Invalid size!");
 300   return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
 301 }
 302
 303 void MCAsmStreamer::ChangeSection(const MCSection *Section) {
 304   assert(Section && "Cannot switch to a null section!");
 305   Section->PrintSwitchToSection(MAI, OS);
 306 }
 307
 308 void MCAsmStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
 309                                         MCSymbol *EHSymbol) {
 310   if (UseCFI)
 311     return;
 312
 313   unsigned Flags = FlagMap.lookup(Symbol);
 314
 315   if (Flags & EHGlobal)
 316     EmitSymbolAttribute(EHSymbol, MCSA_Global);
 317   if (Flags & EHWeakDefinition)
 318     EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
 319   if (Flags & EHPrivateExtern)
 320     EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
 321 }
 322
 323 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
 324   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
 325   MCStreamer::EmitLabel(Symbol);
 326
 327   OS << *Symbol << MAI.getLabelSuffix();
 328   EmitEOL();
 329 }
 330
 331 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
 332   switch (Flag) {
 333   default: assert(0 && "Invalid flag!");
 334   case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
 335   case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
 336   case MCAF_Code16:                OS << "\t.code\t16"; break;
 337   case MCAF_Code32:                OS << "\t.code\t32"; break;
 338   }
 339   EmitEOL();
 340 }
 341
 342 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
 343   // This needs to emit to a temporary string to get properly quoted
 344   // MCSymbols when they have spaces in them.
 345   OS << "\t.thumb_func";
 346   // Only Mach-O hasSubsectionsViaSymbols()
 347   if (MAI.hasSubsectionsViaSymbols())
 348     OS << '\t' << *Func;
 349   EmitEOL();
 350 }
 351
 352 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
 353   OS << *Symbol << " = " << *Value;
 354   EmitEOL();
 355
 356   // FIXME: Lift context changes into super class.
 357   Symbol->setVariableValue(Value);
 358 }
 359
 360 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
 361   OS << ".weakref " << *Alias << ", " << *Symbol;
 362   EmitEOL();
 363 }
 364
 365 void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
 366                                              const MCSymbol *LastLabel,
 367                                              const MCSymbol *Label) {
 368   EmitDwarfSetLineAddr(LineDelta, Label,
 369                        getContext().getTargetAsmInfo().getPointerSize());
 370 }
 371
 372 void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
 373                                               const MCSymbol *Label) {
 374   EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
 375   const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
 376   AddrDelta = ForceExpAbs(AddrDelta);
 377   EmitValue(AddrDelta, 4);
 378 }
 379
 380
 381 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
 382                                         MCSymbolAttr Attribute) {
 383   switch (Attribute) {
 384   case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
 385   case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
 386   case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
 387   case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
 388   case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
 389   case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
 390   case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
 391   case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
 392     assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
 393     OS << "\t.type\t" << *Symbol << ','
 394        << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
 395     switch (Attribute) {
 396     default: assert(0 && "Unknown ELF .type");
 397     case MCSA_ELF_TypeFunction:    OS << "function"; break;
 398     case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
 399     case MCSA_ELF_TypeObject:      OS << "object"; break;
 400     case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
 401     case MCSA_ELF_TypeCommon:      OS << "common"; break;
 402     case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
 403     case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
 404     }
 405     EmitEOL();
 406     return;
 407   case MCSA_Global: // .globl/.global
 408     OS << MAI.getGlobalDirective();
 409     FlagMap[Symbol] |= EHGlobal;
 410     break;
 411   case MCSA_Hidden:         OS << "\t.hidden\t";          break;
 412   case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
 413   case MCSA_Internal:       OS << "\t.internal\t";        break;
 414   case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
 415   case MCSA_Local:          OS << "\t.local\t";           break;
 416   case MCSA_NoDeadStrip:    OS << "\t.no_dead_strip\t";   break;
 417   case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
 418   case MCSA_PrivateExtern:
 419     OS << "\t.private_extern\t";
 420     FlagMap[Symbol] |= EHPrivateExtern;
 421     break;
 422   case MCSA_Protected:      OS << "\t.protected\t";       break;
 423   case MCSA_Reference:      OS << "\t.reference\t";       break;
 424   case MCSA_Weak:           OS << "\t.weak\t";            break;
 425   case MCSA_WeakDefinition:
 426     OS << "\t.weak_definition\t";
 427     FlagMap[Symbol] |= EHWeakDefinition;
 428     break;
 429       // .weak_reference
 430   case MCSA_WeakReference:  OS << MAI.getWeakRefDirective(); break;
 431   case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
 432   }
 433
 434   OS << *Symbol;
 435   EmitEOL();
 436 }
 437
 438 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
 439   OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
 440   EmitEOL();
 441 }
 442
 443 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
 444   OS << "\t.def\t " << *Symbol << ';';
 445   EmitEOL();
 446 }
 447
 448 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
 449   OS << "\t.scl\t" << StorageClass << ';';
 450   EmitEOL();
 451 }
 452
 453 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
 454   OS << "\t.type\t" << Type << ';';
 455   EmitEOL();
 456 }
 457
 458 void MCAsmStreamer::EndCOFFSymbolDef() {
 459   OS << "\t.endef";
 460   EmitEOL();
 461 }
 462
 463 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
 464   assert(MAI.hasDotTypeDotSizeDirective());
 465   OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
 466 }
 467
 468 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
 469                                      unsigned ByteAlignment) {
 470   OS << "\t.comm\t" << *Symbol << ',' << Size;
 471   if (ByteAlignment != 0) {
 472     if (MAI.getCOMMDirectiveAlignmentIsInBytes())
 473       OS << ',' << ByteAlignment;
 474     else
 475       OS << ',' << Log2_32(ByteAlignment);
 476   }
 477   EmitEOL();
 478 }
 479
 480 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
 481 ///
 482 /// @param Symbol - The common symbol to emit.
 483 /// @param Size - The size of the common symbol.
 484 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
 485   assert(MAI.hasLCOMMDirective() && "Doesn't have .lcomm, can't emit it!");
 486   OS << "\t.lcomm\t" << *Symbol << ',' << Size;
 487   EmitEOL();
 488 }
 489
 490 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
 491                                  unsigned Size, unsigned ByteAlignment) {
 492   // Note: a .zerofill directive does not switch sections.
 493   OS << ".zerofill ";
 494
 495   // This is a mach-o specific directive.
 496   const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
 497   OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
 498
 499   if (Symbol != NULL) {
 500     OS << ',' << *Symbol << ',' << Size;
 501     if (ByteAlignment != 0)
 502       OS << ',' << Log2_32(ByteAlignment);
 503   }
 504   EmitEOL();
 505 }
 506
 507 // .tbss sym, size, align
 508 // This depends that the symbol has already been mangled from the original,
 509 // e.g. _a.
 510 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
 511                                    uint64_t Size, unsigned ByteAlignment) {
 512   assert(Symbol != NULL && "Symbol shouldn't be NULL!");
 513   // Instead of using the Section we'll just use the shortcut.
 514   // This is a mach-o specific directive and section.
 515   OS << ".tbss " << *Symbol << ", " << Size;
 516
 517   // Output align if we have it.  We default to 1 so don't bother printing
 518   // that.
 519   if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
 520
 521   EmitEOL();
 522 }
 523
 524 static inline char toOctal(int X) { return (X&7)+'0'; }
 525
 526 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
 527   OS << '"';
 528
 529   for (unsigned i = 0, e = Data.size(); i != e; ++i) {
 530     unsigned char C = Data[i];
 531     if (C == '"' || C == '\\') {
 532       OS << '\\' << (char)C;
 533       continue;
 534     }
 535
 536     if (isprint((unsigned char)C)) {
 537       OS << (char)C;
 538       continue;
 539     }
 540
 541     switch (C) {
 542       case '\b': OS << "\\b"; break;
 543       case '\f': OS << "\\f"; break;
 544       case '\n': OS << "\\n"; break;
 545       case '\r': OS << "\\r"; break;
 546       case '\t': OS << "\\t"; break;
 547       default:
 548         OS << '\\';
 549         OS << toOctal(C >> 6);
 550         OS << toOctal(C >> 3);
 551         OS << toOctal(C >> 0);
 552         break;
 553     }
 554   }
 555
 556   OS << '"';
 557 }
 558
 559
 560 void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
 561   assert(getCurrentSection() && "Cannot emit contents before setting section!");
 562   if (Data.empty()) return;
 563
 564   if (Data.size() == 1) {
 565     OS << MAI.getData8bitsDirective(AddrSpace);
 566     OS << (unsigned)(unsigned char)Data[0];
 567     EmitEOL();
 568     return;
 569   }
 570
 571   // If the data ends with 0 and the target supports .asciz, use it, otherwise
 572   // use .ascii
 573   if (MAI.getAscizDirective() && Data.back() == 0) {
 574     OS << MAI.getAscizDirective();
 575     Data = Data.substr(0, Data.size()-1);
 576   } else {
 577     OS << MAI.getAsciiDirective();
 578   }
 579
 580   OS << ' ';
 581   PrintQuotedString(Data, OS);
 582   EmitEOL();
 583 }
 584
 585 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
 586                                  unsigned AddrSpace) {
 587   EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
 588 }
 589
 590 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
 591                                   unsigned AddrSpace) {
 592   assert(getCurrentSection() && "Cannot emit contents before setting section!");
 593   const char *Directive = 0;
 594   switch (Size) {
 595   default: break;
 596   case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
 597   case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
 598   case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
 599   case 8:
 600     Directive = MAI.getData64bitsDirective(AddrSpace);
 601     // If the target doesn't support 64-bit data, emit as two 32-bit halves.
 602     if (Directive) break;
 603     int64_t IntValue;
 604     if (!Value->EvaluateAsAbsolute(IntValue))
 605       report_fatal_error("Don't know how to emit this value.");
 606     if (getContext().getTargetAsmInfo().isLittleEndian()) {
 607       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
 608       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
 609     } else {
 610       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
 611       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
 612     }
 613     return;
 614   }
 615
 616   assert(Directive && "Invalid size for machine code value!");
 617   OS << Directive << *Value;
 618   EmitEOL();
 619 }
 620
 621 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
 622   int64_t IntValue;
 623   if (Value->EvaluateAsAbsolute(IntValue)) {
 624     EmitULEB128IntValue(IntValue);
 625     return;
 626   }
 627   assert(MAI.hasLEB128() && "Cannot print a .uleb");
 628   OS << ".uleb128 " << *Value;
 629   EmitEOL();
 630 }
 631
 632 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
 633   int64_t IntValue;
 634   if (Value->EvaluateAsAbsolute(IntValue)) {
 635     EmitSLEB128IntValue(IntValue);
 636     return;
 637   }
 638   assert(MAI.hasLEB128() && "Cannot print a .sleb");
 639   OS << ".sleb128 " << *Value;
 640   EmitEOL();
 641 }
 642
 643 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
 644   assert(MAI.getGPRel32Directive() != 0);
 645   OS << MAI.getGPRel32Directive() << *Value;
 646   EmitEOL();
 647 }
 648
 649
 650 /// EmitFill - Emit NumBytes bytes worth of the value specified by
 651 /// FillValue.  This implements directives such as '.space'.
 652 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
 653                              unsigned AddrSpace) {
 654   if (NumBytes == 0) return;
 655
 656   if (AddrSpace == 0)
 657     if (const char *ZeroDirective = MAI.getZeroDirective()) {
 658       OS << ZeroDirective << NumBytes;
 659       if (FillValue != 0)
 660         OS << ',' << (int)FillValue;
 661       EmitEOL();
 662       return;
 663     }
 664
 665   // Emit a byte at a time.
 666   MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
 667 }
 668
 669 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
 670                                          unsigned ValueSize,
 671                                          unsigned MaxBytesToEmit) {
 672   // Some assemblers don't support non-power of two alignments, so we always
 673   // emit alignments as a power of two if possible.
 674   if (isPowerOf2_32(ByteAlignment)) {
 675     switch (ValueSize) {
 676     default: llvm_unreachable("Invalid size for machine code value!");
 677     case 1: OS << MAI.getAlignDirective(); break;
 678     // FIXME: use MAI for this!
 679     case 2: OS << ".p2alignw "; break;
 680     case 4: OS << ".p2alignl "; break;
 681     case 8: llvm_unreachable("Unsupported alignment size!");
 682     }
 683
 684     if (MAI.getAlignmentIsInBytes())
 685       OS << ByteAlignment;
 686     else
 687       OS << Log2_32(ByteAlignment);
 688
 689     if (Value || MaxBytesToEmit) {
 690       OS << ", 0x";
 691       OS.write_hex(truncateToSize(Value, ValueSize));
 692
 693       if (MaxBytesToEmit)
 694         OS << ", " << MaxBytesToEmit;
 695     }
 696     EmitEOL();
 697     return;
 698   }
 699
 700   // Non-power of two alignment.  This is not widely supported by assemblers.
 701   // FIXME: Parameterize this based on MAI.
 702   switch (ValueSize) {
 703   default: llvm_unreachable("Invalid size for machine code value!");
 704   case 1: OS << ".balign";  break;
 705   case 2: OS << ".balignw"; break;
 706   case 4: OS << ".balignl"; break;
 707   case 8: llvm_unreachable("Unsupported alignment size!");
 708   }
 709
 710   OS << ' ' << ByteAlignment;
 711   OS << ", " << truncateToSize(Value, ValueSize);
 712   if (MaxBytesToEmit)
 713     OS << ", " << MaxBytesToEmit;
 714   EmitEOL();
 715 }
 716
 717 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
 718                                       unsigned MaxBytesToEmit) {
 719   // Emit with a text fill value.
 720   EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
 721                        1, MaxBytesToEmit);
 722 }
 723
 724 void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
 725                                       unsigned char Value) {
 726   // FIXME: Verify that Offset is associated with the current section.
 727   OS << ".org " << *Offset << ", " << (unsigned) Value;
 728   EmitEOL();
 729 }
 730
 731
 732 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
 733   assert(MAI.hasSingleParameterDotFile());
 734   OS << "\t.file\t";
 735   PrintQuotedString(Filename, OS);
 736   EmitEOL();
 737 }
 738
 739 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
 740   if (UseLoc) {
 741     OS << "\t.file\t" << FileNo << ' ';
 742     PrintQuotedString(Filename, OS);
 743     EmitEOL();
 744   }
 745   return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
 746 }
 747
 748 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
 749                                           unsigned Column, unsigned Flags,
 750                                           unsigned Isa,
 751                                           unsigned Discriminator,
 752                                           StringRef FileName) {
 753   this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
 754                                           Isa, Discriminator, FileName);
 755   if (!UseLoc)
 756     return;
 757
 758   OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
 759   if (Flags & DWARF2_FLAG_BASIC_BLOCK)
 760     OS << " basic_block";
 761   if (Flags & DWARF2_FLAG_PROLOGUE_END)
 762     OS << " prologue_end";
 763   if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
 764     OS << " epilogue_begin";
 765
 766   unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
 767   if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
 768     OS << " is_stmt ";
 769
 770     if (Flags & DWARF2_FLAG_IS_STMT)
 771       OS << "1";
 772     else
 773       OS << "0";
 774   }
 775
 776   if (Isa)
 777     OS << "isa " << Isa;
 778   if (Discriminator)
 779     OS << "discriminator " << Discriminator;
 780
 781   if (IsVerboseAsm) {
 782     OS.PadToColumn(MAI.getCommentColumn());
 783     OS << MAI.getCommentString() << ' ' << FileName << ':'
 784        << Line << ':' << Column;
 785   }
 786   EmitEOL();
 787 }
 788
 789 void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
 790   MCStreamer::EmitCFISections(EH, Debug);
 791
 792   if (!UseCFI)
 793     return;
 794
 795   OS << "\t.cfi_sections ";
 796   if (EH) {
 797     OS << ".eh_frame";
 798     if (Debug)
 799       OS << ", .debug_frame";
 800   } else if (Debug) {
 801     OS << ".debug_frame";
 802   }
 803
 804   EmitEOL();
 805 }
 806
 807 void MCAsmStreamer::EmitCFIStartProc() {
 808   MCStreamer::EmitCFIStartProc();
 809
 810   if (!UseCFI)
 811     return;
 812
 813   OS << "\t.cfi_startproc";
 814   EmitEOL();
 815 }
 816
 817 void MCAsmStreamer::EmitCFIEndProc() {
 818   MCStreamer::EmitCFIEndProc();
 819
 820   if (!UseCFI)
 821     return;
 822
 823   OS << "\t.cfi_endproc";
 824   EmitEOL();
 825 }
 826
 827 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
 828   if (InstPrinter && !MAI.useDwarfRegNumForCFI()) {
 829     const TargetAsmInfo &asmInfo = getContext().getTargetAsmInfo();
 830     unsigned LLVMRegister = asmInfo.getLLVMRegNum(Register, true);
 831     InstPrinter->printRegName(OS, LLVMRegister);
 832   } else {
 833     OS << Register;
 834   }
 835 }
 836
 837 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
 838   MCStreamer::EmitCFIDefCfa(Register, Offset);
 839
 840   if (!UseCFI)
 841     return;
 842
 843   OS << "\t.cfi_def_cfa ";
 844   EmitRegisterName(Register);
 845   OS << ", " << Offset;
 846   EmitEOL();
 847 }
 848
 849 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
 850   MCStreamer::EmitCFIDefCfaOffset(Offset);
 851
 852   if (!UseCFI)
 853     return;
 854
 855   OS << "\t.cfi_def_cfa_offset " << Offset;
 856   EmitEOL();
 857 }
 858
 859 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
 860   MCStreamer::EmitCFIDefCfaRegister(Register);
 861
 862   if (!UseCFI)
 863     return;
 864
 865   OS << "\t.cfi_def_cfa_register ";
 866   EmitRegisterName(Register);
 867   EmitEOL();
 868 }
 869
 870 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
 871   this->MCStreamer::EmitCFIOffset(Register, Offset);
 872
 873   if (!UseCFI)
 874     return;
 875
 876   OS << "\t.cfi_offset ";
 877   EmitRegisterName(Register);
 878   OS << ", " << Offset;
 879   EmitEOL();
 880 }
 881
 882 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
 883                                        unsigned Encoding) {
 884   MCStreamer::EmitCFIPersonality(Sym, Encoding);
 885
 886   if (!UseCFI)
 887     return;
 888
 889   OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
 890   EmitEOL();
 891 }
 892
 893 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
 894   MCStreamer::EmitCFILsda(Sym, Encoding);
 895
 896   if (!UseCFI)
 897     return;
 898
 899   OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
 900   EmitEOL();
 901 }
 902
 903 void MCAsmStreamer::EmitCFIRememberState() {
 904   MCStreamer::EmitCFIRememberState();
 905
 906   if (!UseCFI)
 907     return;
 908
 909   OS << "\t.cfi_remember_state";
 910   EmitEOL();
 911 }
 912
 913 void MCAsmStreamer::EmitCFIRestoreState() {
 914   MCStreamer::EmitCFIRestoreState();
 915
 916   if (!UseCFI)
 917     return;
 918
 919   OS << "\t.cfi_restore_state";
 920   EmitEOL();
 921 }
 922
 923 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
 924   MCStreamer::EmitCFISameValue(Register);
 925
 926   if (!UseCFI)
 927     return;
 928
 929   OS << "\t.cfi_same_value ";
 930   EmitRegisterName(Register);
 931   EmitEOL();
 932 }
 933
 934 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
 935   MCStreamer::EmitCFIRelOffset(Register, Offset);
 936
 937   if (!UseCFI)
 938     return;
 939
 940   OS << "\t.cfi_rel_offset ";
 941   EmitRegisterName(Register);
 942   OS << ", " << Offset;
 943   EmitEOL();
 944 }
 945
 946 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
 947   MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
 948
 949   if (!UseCFI)
 950     return;
 951
 952   OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
 953   EmitEOL();
 954 }
 955
 956 void MCAsmStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
 957   MCStreamer::EmitWin64EHStartProc(Symbol);
 958
 959   OS << ".seh_proc " << *Symbol;
 960   EmitEOL();
 961 }
 962
 963 void MCAsmStreamer::EmitWin64EHEndProc() {
 964   MCStreamer::EmitWin64EHEndProc();
 965
 966   OS << "\t.seh_endproc";
 967   EmitEOL();
 968 }
 969
 970 void MCAsmStreamer::EmitWin64EHStartChained() {
 971   MCStreamer::EmitWin64EHStartChained();
 972
 973   OS << "\t.seh_startchained";
 974   EmitEOL();
 975 }
 976
 977 void MCAsmStreamer::EmitWin64EHEndChained() {
 978   MCStreamer::EmitWin64EHEndChained();
 979
 980   OS << "\t.seh_endchained";
 981   EmitEOL();
 982 }
 983
 984 void MCAsmStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
 985                                        bool Except) {
 986   MCStreamer::EmitWin64EHHandler(Sym, Unwind, Except);
 987
 988   OS << "\t.seh_handler " << *Sym;
 989   if (Unwind)
 990     OS << ", @unwind";
 991   if (Except)
 992     OS << ", @except";
 993   EmitEOL();
 994 }
 995
 996 void MCAsmStreamer::EmitWin64EHHandlerData() {
 997   MCStreamer::EmitWin64EHHandlerData();
 998
 999   // Switch sections. Don't call SwitchSection directly, because that will
1000   // cause the section switch to be visible in the emitted assembly.
1001   // We only do this so the section switch that terminates the handler
1002   // data block is visible.
1003   MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
1004   StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
1005   const MCSection *xdataSect =
1006     getContext().getTargetAsmInfo().getWin64EHTableSection(suffix);
1007   if (xdataSect)
1008     SwitchSectionNoChange(xdataSect);
1009
1010   OS << "\t.seh_handlerdata";
1011   EmitEOL();
1012 }
1013
1014 void MCAsmStreamer::EmitWin64EHPushReg(unsigned Register) {
1015   MCStreamer::EmitWin64EHPushReg(Register);
1016
1017   OS << "\t.seh_pushreg " << Register;
1018   EmitEOL();
1019 }
1020
1021 void MCAsmStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
1022   MCStreamer::EmitWin64EHSetFrame(Register, Offset);
1023
1024   OS << "\t.seh_setframe " << Register << ", " << Offset;
1025   EmitEOL();
1026 }
1027
1028 void MCAsmStreamer::EmitWin64EHAllocStack(unsigned Size) {
1029   MCStreamer::EmitWin64EHAllocStack(Size);
1030
1031   OS << "\t.seh_stackalloc " << Size;
1032   EmitEOL();
1033 }
1034
1035 void MCAsmStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
1036   MCStreamer::EmitWin64EHSaveReg(Register, Offset);
1037
1038   OS << "\t.seh_savereg " << Register << ", " << Offset;
1039   EmitEOL();
1040 }
1041
1042 void MCAsmStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
1043   MCStreamer::EmitWin64EHSaveXMM(Register, Offset);
1044
1045   OS << "\t.seh_savexmm " << Register << ", " << Offset;
1046   EmitEOL();
1047 }
1048
1049 void MCAsmStreamer::EmitWin64EHPushFrame(bool Code) {
1050   MCStreamer::EmitWin64EHPushFrame(Code);
1051
1052   OS << "\t.seh_pushframe";
1053   if (Code)
1054     OS << " @code";
1055   EmitEOL();
1056 }
1057
1058 void MCAsmStreamer::EmitWin64EHEndProlog(void) {
1059   MCStreamer::EmitWin64EHEndProlog();
1060
1061   OS << "\t.seh_endprologue";
1062   EmitEOL();
1063 }
1064
1065 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
1066   raw_ostream &OS = GetCommentOS();
1067   SmallString<256> Code;
1068   SmallVector<MCFixup, 4> Fixups;
1069   raw_svector_ostream VecOS(Code);
1070   Emitter->EncodeInstruction(Inst, VecOS, Fixups);
1071   VecOS.flush();
1072
1073   // If we are showing fixups, create symbolic markers in the encoded
1074   // representation. We do this by making a per-bit map to the fixup item index,
1075   // then trying to display it as nicely as possible.
1076   SmallVector<uint8_t, 64> FixupMap;
1077   FixupMap.resize(Code.size() * 8);
1078   for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1079     FixupMap[i] = 0;
1080
1081   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1082     MCFixup &F = Fixups[i];
1083     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1084     for (unsigned j = 0; j != Info.TargetSize; ++j) {
1085       unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1086       assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1087       FixupMap[Index] = 1 + i;
1088     }
1089   }
1090
1091   // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1092   // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1093   OS << "encoding: [";
1094   for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1095     if (i)
1096       OS << ',';
1097
1098     // See if all bits are the same map entry.
1099     uint8_t MapEntry = FixupMap[i * 8 + 0];
1100     for (unsigned j = 1; j != 8; ++j) {
1101       if (FixupMap[i * 8 + j] == MapEntry)
1102         continue;
1103
1104       MapEntry = uint8_t(~0U);
1105       break;
1106     }
1107
1108     if (MapEntry != uint8_t(~0U)) {
1109       if (MapEntry == 0) {
1110         OS << format("0x%02x", uint8_t(Code[i]));
1111       } else {
1112         if (Code[i]) {
1113           // FIXME: Some of the 8 bits require fix up.
1114           OS << format("0x%02x", uint8_t(Code[i])) << '\''
1115              << char('A' + MapEntry - 1) << '\'';
1116         } else
1117           OS << char('A' + MapEntry - 1);
1118       }
1119     } else {
1120       // Otherwise, write out in binary.
1121       OS << "0b";
1122       for (unsigned j = 8; j--;) {
1123         unsigned Bit = (Code[i] >> j) & 1;
1124
1125         unsigned FixupBit;
1126         if (getContext().getTargetAsmInfo().isLittleEndian())
1127           FixupBit = i * 8 + j;
1128         else
1129           FixupBit = i * 8 + (7-j);
1130
1131         if (uint8_t MapEntry = FixupMap[FixupBit]) {
1132           assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1133           OS << char('A' + MapEntry - 1);
1134         } else
1135           OS << Bit;
1136       }
1137     }
1138   }
1139   OS << "]\n";
1140
1141   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1142     MCFixup &F = Fixups[i];
1143     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1144     OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1145        << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1146   }
1147 }
1148
1149 void MCAsmStreamer::EmitFnStart() {
1150   OS << "\t.fnstart";
1151   EmitEOL();
1152 }
1153
1154 void MCAsmStreamer::EmitFnEnd() {
1155   OS << "\t.fnend";
1156   EmitEOL();
1157 }
1158
1159 void MCAsmStreamer::EmitCantUnwind() {
1160   OS << "\t.cantunwind";
1161   EmitEOL();
1162 }
1163
1164 void MCAsmStreamer::EmitHandlerData() {
1165   OS << "\t.handlerdata";
1166   EmitEOL();
1167 }
1168
1169 void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
1170   OS << "\t.personality " << Personality->getName();
1171   EmitEOL();
1172 }
1173
1174 void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
1175   OS << "\t.setfp\t";
1176   InstPrinter->printRegName(OS, FpReg);
1177   OS << ", ";
1178   InstPrinter->printRegName(OS, SpReg);
1179   if (Offset)
1180     OS << ", #" << Offset;
1181   EmitEOL();
1182 }
1183
1184 void MCAsmStreamer::EmitPad(int64_t Offset) {
1185   OS << "\t.pad\t#" << Offset;
1186   EmitEOL();
1187 }
1188
1189 void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
1190                                 bool isVector) {
1191   assert(RegList.size() && "RegList should not be empty");
1192   if (isVector)
1193     OS << "\t.vsave\t{";
1194   else
1195     OS << "\t.save\t{";
1196
1197   InstPrinter->printRegName(OS, RegList[0]);
1198
1199   for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
1200     OS << ", ";
1201     InstPrinter->printRegName(OS, RegList[i]);
1202   }
1203
1204   OS << "}";
1205   EmitEOL();
1206 }
1207
1208 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
1209   assert(getCurrentSection() && "Cannot emit contents before setting section!");
1210
1211   // Show the encoding in a comment if we have a code emitter.
1212   if (Emitter)
1213     AddEncodingComment(Inst);
1214
1215   // Show the MCInst if enabled.
1216   if (ShowInst) {
1217     Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
1218     GetCommentOS() << "\n";
1219   }
1220
1221   // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
1222   if (InstPrinter)
1223     InstPrinter->printInst(&Inst, OS);
1224   else
1225     Inst.print(OS, &MAI);
1226   EmitEOL();
1227 }
1228
1229 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
1230 /// the specified string in the output .s file.  This capability is
1231 /// indicated by the hasRawTextSupport() predicate.
1232 void MCAsmStreamer::EmitRawText(StringRef String) {
1233   if (!String.empty() && String.back() == '\n')
1234     String = String.substr(0, String.size()-1);
1235   OS << String;
1236   EmitEOL();
1237 }
1238
1239 void MCAsmStreamer::Finish() {
1240   // Dump out the dwarf file & directory tables and line tables.
1241   if (getContext().hasDwarfFiles() && !UseLoc)
1242     MCDwarfFileTable::Emit(this);
1243
1244   if (!UseCFI)
1245     EmitFrames(false);
1246 }
1247 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1248                                     formatted_raw_ostream &OS,
1249                                     bool isVerboseAsm, bool useLoc,
1250                                     bool useCFI, MCInstPrinter *IP,
1251                                     MCCodeEmitter *CE, TargetAsmBackend *TAB,
1252                                     bool ShowInst) {
1253   return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc, useCFI,
1254                            IP, CE, TAB, ShowInst);
1255 }