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      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/MCRegisterInfo.h"
     19 #include "llvm/MC/MCSectionCOFF.h"
     20 #include "llvm/MC/MCSectionMachO.h"
     21 #include "llvm/MC/MCSymbol.h"
     22 #include "llvm/ADT/OwningPtr.h"
     23 #include "llvm/ADT/SmallString.h"
     24 #include "llvm/ADT/StringExtras.h"
     25 #include "llvm/ADT/Twine.h"
     26 #include "llvm/Support/ErrorHandling.h"
     27 #include "llvm/Support/MathExtras.h"
     28 #include "llvm/Support/Format.h"
     29 #include "llvm/Support/FormattedStream.h"
     30 #include "llvm/Target/TargetAsmBackend.h"
     31 #include "llvm/Target/TargetAsmInfo.h"
     32 #include "llvm/Target/TargetLoweringObjectFile.h"
     33 #include <cctype>
     34 using namespace llvm;
     35 
     36 namespace {
     37 
     38 class MCAsmStreamer : public MCStreamer {
     39 protected:
     40   formatted_raw_ostream &OS;
     41   const MCAsmInfo &MAI;
     42 private:
     43   OwningPtr<MCInstPrinter> InstPrinter;
     44   OwningPtr<MCCodeEmitter> Emitter;
     45   OwningPtr<TargetAsmBackend> AsmBackend;
     46 
     47   SmallString<128> CommentToEmit;
     48   raw_svector_ostream CommentStream;
     49 
     50   unsigned IsVerboseAsm : 1;
     51   unsigned ShowInst : 1;
     52   unsigned UseLoc : 1;
     53   unsigned UseCFI : 1;
     54 
     55   enum EHSymbolFlags { EHGlobal         = 1,
     56                        EHWeakDefinition = 1 << 1,
     57                        EHPrivateExtern  = 1 << 2 };
     58   DenseMap<const MCSymbol*, unsigned> FlagMap;
     59 
     60   bool needsSet(const MCExpr *Value);
     61 
     62   void EmitRegisterName(int64_t Register);
     63 
     64 public:
     65   MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
     66                 bool isVerboseAsm, bool useLoc, bool useCFI,
     67                 MCInstPrinter *printer, MCCodeEmitter *emitter,
     68                 TargetAsmBackend *asmbackend,
     69                 bool showInst)
     70     : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
     71       InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
     72       CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
     73       ShowInst(showInst), UseLoc(useLoc), UseCFI(useCFI) {
     74     if (InstPrinter && IsVerboseAsm)
     75       InstPrinter->setCommentStream(CommentStream);
     76   }
     77   ~MCAsmStreamer() {}
     78 
     79   inline void EmitEOL() {
     80     // If we don't have any comments, just emit a \n.
     81     if (!IsVerboseAsm) {
     82       OS << '\n';
     83       return;
     84     }
     85     EmitCommentsAndEOL();
     86   }
     87   void EmitCommentsAndEOL();
     88 
     89   /// isVerboseAsm - Return true if this streamer supports verbose assembly at
     90   /// all.
     91   virtual bool isVerboseAsm() const { return IsVerboseAsm; }
     92 
     93   /// hasRawTextSupport - We support EmitRawText.
     94   virtual bool hasRawTextSupport() const { return true; }
     95 
     96   /// AddComment - Add a comment that can be emitted to the generated .s
     97   /// file if applicable as a QoI issue to make the output of the compiler
     98   /// more readable.  This only affects the MCAsmStreamer, and only when
     99   /// verbose assembly output is enabled.
    100   virtual void AddComment(const Twine &T);
    101 
    102   /// AddEncodingComment - Add a comment showing the encoding of an instruction.
    103   virtual void AddEncodingComment(const MCInst &Inst);
    104 
    105   /// GetCommentOS - Return a raw_ostream that comments can be written to.
    106   /// Unlike AddComment, you are required to terminate comments with \n if you
    107   /// use this method.
    108   virtual raw_ostream &GetCommentOS() {
    109     if (!IsVerboseAsm)
    110       return nulls();  // Discard comments unless in verbose asm mode.
    111     return CommentStream;
    112   }
    113 
    114   /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
    115   virtual void AddBlankLine() {
    116     EmitEOL();
    117   }
    118 
    119   /// @name MCStreamer Interface
    120   /// @{
    121 
    122   virtual void ChangeSection(const MCSection *Section);
    123 
    124   virtual void InitSections() {
    125     // FIXME, this is MachO specific, but the testsuite
    126     // expects this.
    127     SwitchSection(getContext().getMachOSection("__TEXT", "__text",
    128                          MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
    129                          0, SectionKind::getText()));
    130   }
    131 
    132   virtual void EmitLabel(MCSymbol *Symbol);
    133   virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
    134                                    MCSymbol *EHSymbol);
    135   virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
    136   virtual void EmitThumbFunc(MCSymbol *Func);
    137 
    138   virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
    139   virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
    140   virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
    141                                         const MCSymbol *LastLabel,
    142                                         const MCSymbol *Label,
    143                                         unsigned PointerSize);
    144   virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
    145                                          const MCSymbol *Label);
    146 
    147   virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
    148 
    149   virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
    150   virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
    151   virtual void EmitCOFFSymbolStorageClass(int StorageClass);
    152   virtual void EmitCOFFSymbolType(int Type);
    153   virtual void EndCOFFSymbolDef();
    154   virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
    155   virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    156                                 unsigned ByteAlignment);
    157 
    158   /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
    159   ///
    160   /// @param Symbol - The common symbol to emit.
    161   /// @param Size - The size of the common symbol.
    162   virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
    163 
    164   virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
    165                             unsigned Size = 0, unsigned ByteAlignment = 0);
    166 
    167   virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
    168                                uint64_t Size, unsigned ByteAlignment = 0);
    169 
    170   virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
    171 
    172   virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
    173                              unsigned AddrSpace);
    174   virtual void EmitIntValue(uint64_t Value, unsigned Size,
    175                             unsigned AddrSpace = 0);
    176 
    177   virtual void EmitULEB128Value(const MCExpr *Value);
    178 
    179   virtual void EmitSLEB128Value(const MCExpr *Value);
    180 
    181   virtual void EmitGPRel32Value(const MCExpr *Value);
    182 
    183 
    184   virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
    185                         unsigned AddrSpace);
    186 
    187   virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
    188                                     unsigned ValueSize = 1,
    189                                     unsigned MaxBytesToEmit = 0);
    190 
    191   virtual void EmitCodeAlignment(unsigned ByteAlignment,
    192                                  unsigned MaxBytesToEmit = 0);
    193 
    194   virtual void EmitValueToOffset(const MCExpr *Offset,
    195                                  unsigned char Value = 0);
    196 
    197   virtual void EmitFileDirective(StringRef Filename);
    198   virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
    199   virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    200                                      unsigned Column, unsigned Flags,
    201                                      unsigned Isa, unsigned Discriminator,
    202                                      StringRef FileName);
    203 
    204   virtual void EmitCFISections(bool EH, bool Debug);
    205   virtual void EmitCFIStartProc();
    206   virtual void EmitCFIEndProc();
    207   virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
    208   virtual void EmitCFIDefCfaOffset(int64_t Offset);
    209   virtual void EmitCFIDefCfaRegister(int64_t Register);
    210   virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
    211   virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
    212   virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
    213   virtual void EmitCFIRememberState();
    214   virtual void EmitCFIRestoreState();
    215   virtual void EmitCFISameValue(int64_t Register);
    216   virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
    217   virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
    218 
    219   virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
    220   virtual void EmitWin64EHEndProc();
    221   virtual void EmitWin64EHStartChained();
    222   virtual void EmitWin64EHEndChained();
    223   virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
    224                                   bool Except);
    225   virtual void EmitWin64EHHandlerData();
    226   virtual void EmitWin64EHPushReg(unsigned Register);
    227   virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset);
    228   virtual void EmitWin64EHAllocStack(unsigned Size);
    229   virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset);
    230   virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset);
    231   virtual void EmitWin64EHPushFrame(bool Code);
    232   virtual void EmitWin64EHEndProlog();
    233 
    234   virtual void EmitFnStart();
    235   virtual void EmitFnEnd();
    236   virtual void EmitCantUnwind();
    237   virtual void EmitPersonality(const MCSymbol *Personality);
    238   virtual void EmitHandlerData();
    239   virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
    240   virtual void EmitPad(int64_t Offset);
    241   virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
    242 
    243 
    244   virtual void EmitInstruction(const MCInst &Inst);
    245 
    246   /// EmitRawText - If this file is backed by an assembly streamer, this dumps
    247   /// the specified string in the output .s file.  This capability is
    248   /// indicated by the hasRawTextSupport() predicate.
    249   virtual void EmitRawText(StringRef String);
    250 
    251   virtual void Finish();
    252 
    253   /// @}
    254 };
    255 
    256 } // end anonymous namespace.
    257 
    258 /// AddComment - Add a comment that can be emitted to the generated .s
    259 /// file if applicable as a QoI issue to make the output of the compiler
    260 /// more readable.  This only affects the MCAsmStreamer, and only when
    261 /// verbose assembly output is enabled.
    262 void MCAsmStreamer::AddComment(const Twine &T) {
    263   if (!IsVerboseAsm) return;
    264 
    265   // Make sure that CommentStream is flushed.
    266   CommentStream.flush();
    267 
    268   T.toVector(CommentToEmit);
    269   // Each comment goes on its own line.
    270   CommentToEmit.push_back('\n');
    271 
    272   // Tell the comment stream that the vector changed underneath it.
    273   CommentStream.resync();
    274 }
    275 
    276 void MCAsmStreamer::EmitCommentsAndEOL() {
    277   if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
    278     OS << '\n';
    279     return;
    280   }
    281 
    282   CommentStream.flush();
    283   StringRef Comments = CommentToEmit.str();
    284 
    285   assert(Comments.back() == '\n' &&
    286          "Comment array not newline terminated");
    287   do {
    288     // Emit a line of comments.
    289     OS.PadToColumn(MAI.getCommentColumn());
    290     size_t Position = Comments.find('\n');
    291     OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
    292 
    293     Comments = Comments.substr(Position+1);
    294   } while (!Comments.empty());
    295 
    296   CommentToEmit.clear();
    297   // Tell the comment stream that the vector changed underneath it.
    298   CommentStream.resync();
    299 }
    300 
    301 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
    302   assert(Bytes && "Invalid size!");
    303   return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
    304 }
    305 
    306 void MCAsmStreamer::ChangeSection(const MCSection *Section) {
    307   assert(Section && "Cannot switch to a null section!");
    308   Section->PrintSwitchToSection(MAI, OS);
    309 }
    310 
    311 void MCAsmStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
    312                                         MCSymbol *EHSymbol) {
    313   if (UseCFI)
    314     return;
    315 
    316   unsigned Flags = FlagMap.lookup(Symbol);
    317 
    318   if (Flags & EHGlobal)
    319     EmitSymbolAttribute(EHSymbol, MCSA_Global);
    320   if (Flags & EHWeakDefinition)
    321     EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
    322   if (Flags & EHPrivateExtern)
    323     EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
    324 }
    325 
    326 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
    327   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
    328   MCStreamer::EmitLabel(Symbol);
    329 
    330   OS << *Symbol << MAI.getLabelSuffix();
    331   EmitEOL();
    332 }
    333 
    334 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
    335   switch (Flag) {
    336   default: assert(0 && "Invalid flag!");
    337   case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
    338   case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
    339   case MCAF_Code16:                OS << "\t.code\t16"; break;
    340   case MCAF_Code32:                OS << "\t.code\t32"; break;
    341   }
    342   EmitEOL();
    343 }
    344 
    345 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
    346   // This needs to emit to a temporary string to get properly quoted
    347   // MCSymbols when they have spaces in them.
    348   OS << "\t.thumb_func";
    349   // Only Mach-O hasSubsectionsViaSymbols()
    350   if (MAI.hasSubsectionsViaSymbols())
    351     OS << '\t' << *Func;
    352   EmitEOL();
    353 }
    354 
    355 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
    356   OS << *Symbol << " = " << *Value;
    357   EmitEOL();
    358 
    359   // FIXME: Lift context changes into super class.
    360   Symbol->setVariableValue(Value);
    361 }
    362 
    363 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
    364   OS << ".weakref " << *Alias << ", " << *Symbol;
    365   EmitEOL();
    366 }
    367 
    368 void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
    369                                              const MCSymbol *LastLabel,
    370                                              const MCSymbol *Label,
    371                                              unsigned PointerSize) {
    372   EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
    373 }
    374 
    375 void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
    376                                               const MCSymbol *Label) {
    377   EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
    378   const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
    379   AddrDelta = ForceExpAbs(AddrDelta);
    380   EmitValue(AddrDelta, 4);
    381 }
    382 
    383 
    384 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
    385                                         MCSymbolAttr Attribute) {
    386   switch (Attribute) {
    387   case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
    388   case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
    389   case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
    390   case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
    391   case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
    392   case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
    393   case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
    394   case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
    395     assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
    396     OS << "\t.type\t" << *Symbol << ','
    397        << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
    398     switch (Attribute) {
    399     default: assert(0 && "Unknown ELF .type");
    400     case MCSA_ELF_TypeFunction:    OS << "function"; break;
    401     case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
    402     case MCSA_ELF_TypeObject:      OS << "object"; break;
    403     case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
    404     case MCSA_ELF_TypeCommon:      OS << "common"; break;
    405     case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
    406     case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
    407     }
    408     EmitEOL();
    409     return;
    410   case MCSA_Global: // .globl/.global
    411     OS << MAI.getGlobalDirective();
    412     FlagMap[Symbol] |= EHGlobal;
    413     break;
    414   case MCSA_Hidden:         OS << "\t.hidden\t";          break;
    415   case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
    416   case MCSA_Internal:       OS << "\t.internal\t";        break;
    417   case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
    418   case MCSA_Local:          OS << "\t.local\t";           break;
    419   case MCSA_NoDeadStrip:    OS << "\t.no_dead_strip\t";   break;
    420   case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
    421   case MCSA_PrivateExtern:
    422     OS << "\t.private_extern\t";
    423     FlagMap[Symbol] |= EHPrivateExtern;
    424     break;
    425   case MCSA_Protected:      OS << "\t.protected\t";       break;
    426   case MCSA_Reference:      OS << "\t.reference\t";       break;
    427   case MCSA_Weak:           OS << "\t.weak\t";            break;
    428   case MCSA_WeakDefinition:
    429     OS << "\t.weak_definition\t";
    430     FlagMap[Symbol] |= EHWeakDefinition;
    431     break;
    432       // .weak_reference
    433   case MCSA_WeakReference:  OS << MAI.getWeakRefDirective(); break;
    434   case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
    435   }
    436 
    437   OS << *Symbol;
    438   EmitEOL();
    439 }
    440 
    441 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
    442   OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
    443   EmitEOL();
    444 }
    445 
    446 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
    447   OS << "\t.def\t " << *Symbol << ';';
    448   EmitEOL();
    449 }
    450 
    451 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
    452   OS << "\t.scl\t" << StorageClass << ';';
    453   EmitEOL();
    454 }
    455 
    456 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
    457   OS << "\t.type\t" << Type << ';';
    458   EmitEOL();
    459 }
    460 
    461 void MCAsmStreamer::EndCOFFSymbolDef() {
    462   OS << "\t.endef";
    463   EmitEOL();
    464 }
    465 
    466 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
    467   assert(MAI.hasDotTypeDotSizeDirective());
    468   OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
    469 }
    470 
    471 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    472                                      unsigned ByteAlignment) {
    473   OS << "\t.comm\t" << *Symbol << ',' << Size;
    474   if (ByteAlignment != 0) {
    475     if (MAI.getCOMMDirectiveAlignmentIsInBytes())
    476       OS << ',' << ByteAlignment;
    477     else
    478       OS << ',' << Log2_32(ByteAlignment);
    479   }
    480   EmitEOL();
    481 }
    482 
    483 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
    484 ///
    485 /// @param Symbol - The common symbol to emit.
    486 /// @param Size - The size of the common symbol.
    487 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
    488   assert(MAI.hasLCOMMDirective() && "Doesn't have .lcomm, can't emit it!");
    489   OS << "\t.lcomm\t" << *Symbol << ',' << Size;
    490   EmitEOL();
    491 }
    492 
    493 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
    494                                  unsigned Size, unsigned ByteAlignment) {
    495   // Note: a .zerofill directive does not switch sections.
    496   OS << ".zerofill ";
    497 
    498   // This is a mach-o specific directive.
    499   const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
    500   OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
    501 
    502   if (Symbol != NULL) {
    503     OS << ',' << *Symbol << ',' << Size;
    504     if (ByteAlignment != 0)
    505       OS << ',' << Log2_32(ByteAlignment);
    506   }
    507   EmitEOL();
    508 }
    509 
    510 // .tbss sym, size, align
    511 // This depends that the symbol has already been mangled from the original,
    512 // e.g. _a.
    513 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
    514                                    uint64_t Size, unsigned ByteAlignment) {
    515   assert(Symbol != NULL && "Symbol shouldn't be NULL!");
    516   // Instead of using the Section we'll just use the shortcut.
    517   // This is a mach-o specific directive and section.
    518   OS << ".tbss " << *Symbol << ", " << Size;
    519 
    520   // Output align if we have it.  We default to 1 so don't bother printing
    521   // that.
    522   if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
    523 
    524   EmitEOL();
    525 }
    526 
    527 static inline char toOctal(int X) { return (X&7)+'0'; }
    528 
    529 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
    530   OS << '"';
    531 
    532   for (unsigned i = 0, e = Data.size(); i != e; ++i) {
    533     unsigned char C = Data[i];
    534     if (C == '"' || C == '\\') {
    535       OS << '\\' << (char)C;
    536       continue;
    537     }
    538 
    539     if (isprint((unsigned char)C)) {
    540       OS << (char)C;
    541       continue;
    542     }
    543 
    544     switch (C) {
    545       case '\b': OS << "\\b"; break;
    546       case '\f': OS << "\\f"; break;
    547       case '\n': OS << "\\n"; break;
    548       case '\r': OS << "\\r"; break;
    549       case '\t': OS << "\\t"; break;
    550       default:
    551         OS << '\\';
    552         OS << toOctal(C >> 6);
    553         OS << toOctal(C >> 3);
    554         OS << toOctal(C >> 0);
    555         break;
    556     }
    557   }
    558 
    559   OS << '"';
    560 }
    561 
    562 
    563 void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
    564   assert(getCurrentSection() && "Cannot emit contents before setting section!");
    565   if (Data.empty()) return;
    566 
    567   if (Data.size() == 1) {
    568     OS << MAI.getData8bitsDirective(AddrSpace);
    569     OS << (unsigned)(unsigned char)Data[0];
    570     EmitEOL();
    571     return;
    572   }
    573 
    574   // If the data ends with 0 and the target supports .asciz, use it, otherwise
    575   // use .ascii
    576   if (MAI.getAscizDirective() && Data.back() == 0) {
    577     OS << MAI.getAscizDirective();
    578     Data = Data.substr(0, Data.size()-1);
    579   } else {
    580     OS << MAI.getAsciiDirective();
    581   }
    582 
    583   OS << ' ';
    584   PrintQuotedString(Data, OS);
    585   EmitEOL();
    586 }
    587 
    588 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
    589                                  unsigned AddrSpace) {
    590   EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
    591 }
    592 
    593 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
    594                                   unsigned AddrSpace) {
    595   assert(getCurrentSection() && "Cannot emit contents before setting section!");
    596   const char *Directive = 0;
    597   switch (Size) {
    598   default: break;
    599   case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
    600   case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
    601   case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
    602   case 8:
    603     Directive = MAI.getData64bitsDirective(AddrSpace);
    604     // If the target doesn't support 64-bit data, emit as two 32-bit halves.
    605     if (Directive) break;
    606     int64_t IntValue;
    607     if (!Value->EvaluateAsAbsolute(IntValue))
    608       report_fatal_error("Don't know how to emit this value.");
    609     if (getContext().getAsmInfo().isLittleEndian()) {
    610       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
    611       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
    612     } else {
    613       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
    614       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
    615     }
    616     return;
    617   }
    618 
    619   assert(Directive && "Invalid size for machine code value!");
    620   OS << Directive << *Value;
    621   EmitEOL();
    622 }
    623 
    624 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
    625   int64_t IntValue;
    626   if (Value->EvaluateAsAbsolute(IntValue)) {
    627     EmitULEB128IntValue(IntValue);
    628     return;
    629   }
    630   assert(MAI.hasLEB128() && "Cannot print a .uleb");
    631   OS << ".uleb128 " << *Value;
    632   EmitEOL();
    633 }
    634 
    635 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
    636   int64_t IntValue;
    637   if (Value->EvaluateAsAbsolute(IntValue)) {
    638     EmitSLEB128IntValue(IntValue);
    639     return;
    640   }
    641   assert(MAI.hasLEB128() && "Cannot print a .sleb");
    642   OS << ".sleb128 " << *Value;
    643   EmitEOL();
    644 }
    645 
    646 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
    647   assert(MAI.getGPRel32Directive() != 0);
    648   OS << MAI.getGPRel32Directive() << *Value;
    649   EmitEOL();
    650 }
    651 
    652 
    653 /// EmitFill - Emit NumBytes bytes worth of the value specified by
    654 /// FillValue.  This implements directives such as '.space'.
    655 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
    656                              unsigned AddrSpace) {
    657   if (NumBytes == 0) return;
    658 
    659   if (AddrSpace == 0)
    660     if (const char *ZeroDirective = MAI.getZeroDirective()) {
    661       OS << ZeroDirective << NumBytes;
    662       if (FillValue != 0)
    663         OS << ',' << (int)FillValue;
    664       EmitEOL();
    665       return;
    666     }
    667 
    668   // Emit a byte at a time.
    669   MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
    670 }
    671 
    672 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
    673                                          unsigned ValueSize,
    674                                          unsigned MaxBytesToEmit) {
    675   // Some assemblers don't support non-power of two alignments, so we always
    676   // emit alignments as a power of two if possible.
    677   if (isPowerOf2_32(ByteAlignment)) {
    678     switch (ValueSize) {
    679     default: llvm_unreachable("Invalid size for machine code value!");
    680     case 1: OS << MAI.getAlignDirective(); break;
    681     // FIXME: use MAI for this!
    682     case 2: OS << ".p2alignw "; break;
    683     case 4: OS << ".p2alignl "; break;
    684     case 8: llvm_unreachable("Unsupported alignment size!");
    685     }
    686 
    687     if (MAI.getAlignmentIsInBytes())
    688       OS << ByteAlignment;
    689     else
    690       OS << Log2_32(ByteAlignment);
    691 
    692     if (Value || MaxBytesToEmit) {
    693       OS << ", 0x";
    694       OS.write_hex(truncateToSize(Value, ValueSize));
    695 
    696       if (MaxBytesToEmit)
    697         OS << ", " << MaxBytesToEmit;
    698     }
    699     EmitEOL();
    700     return;
    701   }
    702 
    703   // Non-power of two alignment.  This is not widely supported by assemblers.
    704   // FIXME: Parameterize this based on MAI.
    705   switch (ValueSize) {
    706   default: llvm_unreachable("Invalid size for machine code value!");
    707   case 1: OS << ".balign";  break;
    708   case 2: OS << ".balignw"; break;
    709   case 4: OS << ".balignl"; break;
    710   case 8: llvm_unreachable("Unsupported alignment size!");
    711   }
    712 
    713   OS << ' ' << ByteAlignment;
    714   OS << ", " << truncateToSize(Value, ValueSize);
    715   if (MaxBytesToEmit)
    716     OS << ", " << MaxBytesToEmit;
    717   EmitEOL();
    718 }
    719 
    720 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
    721                                       unsigned MaxBytesToEmit) {
    722   // Emit with a text fill value.
    723   EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
    724                        1, MaxBytesToEmit);
    725 }
    726 
    727 void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
    728                                       unsigned char Value) {
    729   // FIXME: Verify that Offset is associated with the current section.
    730   OS << ".org " << *Offset << ", " << (unsigned) Value;
    731   EmitEOL();
    732 }
    733 
    734 
    735 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
    736   assert(MAI.hasSingleParameterDotFile());
    737   OS << "\t.file\t";
    738   PrintQuotedString(Filename, OS);
    739   EmitEOL();
    740 }
    741 
    742 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
    743   if (UseLoc) {
    744     OS << "\t.file\t" << FileNo << ' ';
    745     PrintQuotedString(Filename, OS);
    746     EmitEOL();
    747   }
    748   return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
    749 }
    750 
    751 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    752                                           unsigned Column, unsigned Flags,
    753                                           unsigned Isa,
    754                                           unsigned Discriminator,
    755                                           StringRef FileName) {
    756   this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
    757                                           Isa, Discriminator, FileName);
    758   if (!UseLoc)
    759     return;
    760 
    761   OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
    762   if (Flags & DWARF2_FLAG_BASIC_BLOCK)
    763     OS << " basic_block";
    764   if (Flags & DWARF2_FLAG_PROLOGUE_END)
    765     OS << " prologue_end";
    766   if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
    767     OS << " epilogue_begin";
    768 
    769   unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
    770   if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
    771     OS << " is_stmt ";
    772 
    773     if (Flags & DWARF2_FLAG_IS_STMT)
    774       OS << "1";
    775     else
    776       OS << "0";
    777   }
    778 
    779   if (Isa)
    780     OS << "isa " << Isa;
    781   if (Discriminator)
    782     OS << "discriminator " << Discriminator;
    783 
    784   if (IsVerboseAsm) {
    785     OS.PadToColumn(MAI.getCommentColumn());
    786     OS << MAI.getCommentString() << ' ' << FileName << ':'
    787        << Line << ':' << Column;
    788   }
    789   EmitEOL();
    790 }
    791 
    792 void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
    793   MCStreamer::EmitCFISections(EH, Debug);
    794 
    795   if (!UseCFI)
    796     return;
    797 
    798   OS << "\t.cfi_sections ";
    799   if (EH) {
    800     OS << ".eh_frame";
    801     if (Debug)
    802       OS << ", .debug_frame";
    803   } else if (Debug) {
    804     OS << ".debug_frame";
    805   }
    806 
    807   EmitEOL();
    808 }
    809 
    810 void MCAsmStreamer::EmitCFIStartProc() {
    811   MCStreamer::EmitCFIStartProc();
    812 
    813   if (!UseCFI)
    814     return;
    815 
    816   OS << "\t.cfi_startproc";
    817   EmitEOL();
    818 }
    819 
    820 void MCAsmStreamer::EmitCFIEndProc() {
    821   MCStreamer::EmitCFIEndProc();
    822 
    823   if (!UseCFI)
    824     return;
    825 
    826   OS << "\t.cfi_endproc";
    827   EmitEOL();
    828 }
    829 
    830 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
    831   if (InstPrinter && !MAI.useDwarfRegNumForCFI()) {
    832     const MCRegisterInfo &MRI = getContext().getRegisterInfo();
    833     unsigned LLVMRegister = MRI.getLLVMRegNum(Register, true);
    834     InstPrinter->printRegName(OS, LLVMRegister);
    835   } else {
    836     OS << Register;
    837   }
    838 }
    839 
    840 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
    841   MCStreamer::EmitCFIDefCfa(Register, Offset);
    842 
    843   if (!UseCFI)
    844     return;
    845 
    846   OS << "\t.cfi_def_cfa ";
    847   EmitRegisterName(Register);
    848   OS << ", " << Offset;
    849   EmitEOL();
    850 }
    851 
    852 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
    853   MCStreamer::EmitCFIDefCfaOffset(Offset);
    854 
    855   if (!UseCFI)
    856     return;
    857 
    858   OS << "\t.cfi_def_cfa_offset " << Offset;
    859   EmitEOL();
    860 }
    861 
    862 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
    863   MCStreamer::EmitCFIDefCfaRegister(Register);
    864 
    865   if (!UseCFI)
    866     return;
    867 
    868   OS << "\t.cfi_def_cfa_register ";
    869   EmitRegisterName(Register);
    870   EmitEOL();
    871 }
    872 
    873 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
    874   this->MCStreamer::EmitCFIOffset(Register, Offset);
    875 
    876   if (!UseCFI)
    877     return;
    878 
    879   OS << "\t.cfi_offset ";
    880   EmitRegisterName(Register);
    881   OS << ", " << Offset;
    882   EmitEOL();
    883 }
    884 
    885 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
    886                                        unsigned Encoding) {
    887   MCStreamer::EmitCFIPersonality(Sym, Encoding);
    888 
    889   if (!UseCFI)
    890     return;
    891 
    892   OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
    893   EmitEOL();
    894 }
    895 
    896 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
    897   MCStreamer::EmitCFILsda(Sym, Encoding);
    898 
    899   if (!UseCFI)
    900     return;
    901 
    902   OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
    903   EmitEOL();
    904 }
    905 
    906 void MCAsmStreamer::EmitCFIRememberState() {
    907   MCStreamer::EmitCFIRememberState();
    908 
    909   if (!UseCFI)
    910     return;
    911 
    912   OS << "\t.cfi_remember_state";
    913   EmitEOL();
    914 }
    915 
    916 void MCAsmStreamer::EmitCFIRestoreState() {
    917   MCStreamer::EmitCFIRestoreState();
    918 
    919   if (!UseCFI)
    920     return;
    921 
    922   OS << "\t.cfi_restore_state";
    923   EmitEOL();
    924 }
    925 
    926 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
    927   MCStreamer::EmitCFISameValue(Register);
    928 
    929   if (!UseCFI)
    930     return;
    931 
    932   OS << "\t.cfi_same_value ";
    933   EmitRegisterName(Register);
    934   EmitEOL();
    935 }
    936 
    937 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
    938   MCStreamer::EmitCFIRelOffset(Register, Offset);
    939 
    940   if (!UseCFI)
    941     return;
    942 
    943   OS << "\t.cfi_rel_offset ";
    944   EmitRegisterName(Register);
    945   OS << ", " << Offset;
    946   EmitEOL();
    947 }
    948 
    949 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
    950   MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
    951 
    952   if (!UseCFI)
    953     return;
    954 
    955   OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
    956   EmitEOL();
    957 }
    958 
    959 void MCAsmStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
    960   MCStreamer::EmitWin64EHStartProc(Symbol);
    961 
    962   OS << ".seh_proc " << *Symbol;
    963   EmitEOL();
    964 }
    965 
    966 void MCAsmStreamer::EmitWin64EHEndProc() {
    967   MCStreamer::EmitWin64EHEndProc();
    968 
    969   OS << "\t.seh_endproc";
    970   EmitEOL();
    971 }
    972 
    973 void MCAsmStreamer::EmitWin64EHStartChained() {
    974   MCStreamer::EmitWin64EHStartChained();
    975 
    976   OS << "\t.seh_startchained";
    977   EmitEOL();
    978 }
    979 
    980 void MCAsmStreamer::EmitWin64EHEndChained() {
    981   MCStreamer::EmitWin64EHEndChained();
    982 
    983   OS << "\t.seh_endchained";
    984   EmitEOL();
    985 }
    986 
    987 void MCAsmStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
    988                                        bool Except) {
    989   MCStreamer::EmitWin64EHHandler(Sym, Unwind, Except);
    990 
    991   OS << "\t.seh_handler " << *Sym;
    992   if (Unwind)
    993     OS << ", @unwind";
    994   if (Except)
    995     OS << ", @except";
    996   EmitEOL();
    997 }
    998 
    999 static const MCSection *getWin64EHTableSection(StringRef suffix,
   1000                                                MCContext &context) {
   1001   // FIXME: This doesn't belong in MCObjectFileInfo. However,
   1002   /// this duplicate code in MCWin64EH.cpp.
   1003   if (suffix == "")
   1004     return context.getObjectFileInfo()->getXDataSection();
   1005   return context.getCOFFSection((".xdata"+suffix).str(),
   1006                                 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
   1007                                 COFF::IMAGE_SCN_MEM_READ |
   1008                                 COFF::IMAGE_SCN_MEM_WRITE,
   1009                                 SectionKind::getDataRel());
   1010 }
   1011 
   1012 void MCAsmStreamer::EmitWin64EHHandlerData() {
   1013   MCStreamer::EmitWin64EHHandlerData();
   1014 
   1015   // Switch sections. Don't call SwitchSection directly, because that will
   1016   // cause the section switch to be visible in the emitted assembly.
   1017   // We only do this so the section switch that terminates the handler
   1018   // data block is visible.
   1019   MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
   1020   StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
   1021   const MCSection *xdataSect = getWin64EHTableSection(suffix, getContext());
   1022   if (xdataSect)
   1023     SwitchSectionNoChange(xdataSect);
   1024 
   1025   OS << "\t.seh_handlerdata";
   1026   EmitEOL();
   1027 }
   1028 
   1029 void MCAsmStreamer::EmitWin64EHPushReg(unsigned Register) {
   1030   MCStreamer::EmitWin64EHPushReg(Register);
   1031 
   1032   OS << "\t.seh_pushreg " << Register;
   1033   EmitEOL();
   1034 }
   1035 
   1036 void MCAsmStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
   1037   MCStreamer::EmitWin64EHSetFrame(Register, Offset);
   1038 
   1039   OS << "\t.seh_setframe " << Register << ", " << Offset;
   1040   EmitEOL();
   1041 }
   1042 
   1043 void MCAsmStreamer::EmitWin64EHAllocStack(unsigned Size) {
   1044   MCStreamer::EmitWin64EHAllocStack(Size);
   1045 
   1046   OS << "\t.seh_stackalloc " << Size;
   1047   EmitEOL();
   1048 }
   1049 
   1050 void MCAsmStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
   1051   MCStreamer::EmitWin64EHSaveReg(Register, Offset);
   1052 
   1053   OS << "\t.seh_savereg " << Register << ", " << Offset;
   1054   EmitEOL();
   1055 }
   1056 
   1057 void MCAsmStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
   1058   MCStreamer::EmitWin64EHSaveXMM(Register, Offset);
   1059 
   1060   OS << "\t.seh_savexmm " << Register << ", " << Offset;
   1061   EmitEOL();
   1062 }
   1063 
   1064 void MCAsmStreamer::EmitWin64EHPushFrame(bool Code) {
   1065   MCStreamer::EmitWin64EHPushFrame(Code);
   1066 
   1067   OS << "\t.seh_pushframe";
   1068   if (Code)
   1069     OS << " @code";
   1070   EmitEOL();
   1071 }
   1072 
   1073 void MCAsmStreamer::EmitWin64EHEndProlog(void) {
   1074   MCStreamer::EmitWin64EHEndProlog();
   1075 
   1076   OS << "\t.seh_endprologue";
   1077   EmitEOL();
   1078 }
   1079 
   1080 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
   1081   raw_ostream &OS = GetCommentOS();
   1082   SmallString<256> Code;
   1083   SmallVector<MCFixup, 4> Fixups;
   1084   raw_svector_ostream VecOS(Code);
   1085   Emitter->EncodeInstruction(Inst, VecOS, Fixups);
   1086   VecOS.flush();
   1087 
   1088   // If we are showing fixups, create symbolic markers in the encoded
   1089   // representation. We do this by making a per-bit map to the fixup item index,
   1090   // then trying to display it as nicely as possible.
   1091   SmallVector<uint8_t, 64> FixupMap;
   1092   FixupMap.resize(Code.size() * 8);
   1093   for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
   1094     FixupMap[i] = 0;
   1095 
   1096   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
   1097     MCFixup &F = Fixups[i];
   1098     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
   1099     for (unsigned j = 0; j != Info.TargetSize; ++j) {
   1100       unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
   1101       assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
   1102       FixupMap[Index] = 1 + i;
   1103     }
   1104   }
   1105 
   1106   // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
   1107   // high order halfword of a 32-bit Thumb2 instruction is emitted first.
   1108   OS << "encoding: [";
   1109   for (unsigned i = 0, e = Code.size(); i != e; ++i) {
   1110     if (i)
   1111       OS << ',';
   1112 
   1113     // See if all bits are the same map entry.
   1114     uint8_t MapEntry = FixupMap[i * 8 + 0];
   1115     for (unsigned j = 1; j != 8; ++j) {
   1116       if (FixupMap[i * 8 + j] == MapEntry)
   1117         continue;
   1118 
   1119       MapEntry = uint8_t(~0U);
   1120       break;
   1121     }
   1122 
   1123     if (MapEntry != uint8_t(~0U)) {
   1124       if (MapEntry == 0) {
   1125         OS << format("0x%02x", uint8_t(Code[i]));
   1126       } else {
   1127         if (Code[i]) {
   1128           // FIXME: Some of the 8 bits require fix up.
   1129           OS << format("0x%02x", uint8_t(Code[i])) << '\''
   1130              << char('A' + MapEntry - 1) << '\'';
   1131         } else
   1132           OS << char('A' + MapEntry - 1);
   1133       }
   1134     } else {
   1135       // Otherwise, write out in binary.
   1136       OS << "0b";
   1137       for (unsigned j = 8; j--;) {
   1138         unsigned Bit = (Code[i] >> j) & 1;
   1139 
   1140         unsigned FixupBit;
   1141         if (getContext().getAsmInfo().isLittleEndian())
   1142           FixupBit = i * 8 + j;
   1143         else
   1144           FixupBit = i * 8 + (7-j);
   1145 
   1146         if (uint8_t MapEntry = FixupMap[FixupBit]) {
   1147           assert(Bit == 0 && "Encoder wrote into fixed up bit!");
   1148           OS << char('A' + MapEntry - 1);
   1149         } else
   1150           OS << Bit;
   1151       }
   1152     }
   1153   }
   1154   OS << "]\n";
   1155 
   1156   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
   1157     MCFixup &F = Fixups[i];
   1158     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
   1159     OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
   1160        << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
   1161   }
   1162 }
   1163 
   1164 void MCAsmStreamer::EmitFnStart() {
   1165   OS << "\t.fnstart";
   1166   EmitEOL();
   1167 }
   1168 
   1169 void MCAsmStreamer::EmitFnEnd() {
   1170   OS << "\t.fnend";
   1171   EmitEOL();
   1172 }
   1173 
   1174 void MCAsmStreamer::EmitCantUnwind() {
   1175   OS << "\t.cantunwind";
   1176   EmitEOL();
   1177 }
   1178 
   1179 void MCAsmStreamer::EmitHandlerData() {
   1180   OS << "\t.handlerdata";
   1181   EmitEOL();
   1182 }
   1183 
   1184 void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
   1185   OS << "\t.personality " << Personality->getName();
   1186   EmitEOL();
   1187 }
   1188 
   1189 void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
   1190   OS << "\t.setfp\t";
   1191   InstPrinter->printRegName(OS, FpReg);
   1192   OS << ", ";
   1193   InstPrinter->printRegName(OS, SpReg);
   1194   if (Offset)
   1195     OS << ", #" << Offset;
   1196   EmitEOL();
   1197 }
   1198 
   1199 void MCAsmStreamer::EmitPad(int64_t Offset) {
   1200   OS << "\t.pad\t#" << Offset;
   1201   EmitEOL();
   1202 }
   1203 
   1204 void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
   1205                                 bool isVector) {
   1206   assert(RegList.size() && "RegList should not be empty");
   1207   if (isVector)
   1208     OS << "\t.vsave\t{";
   1209   else
   1210     OS << "\t.save\t{";
   1211 
   1212   InstPrinter->printRegName(OS, RegList[0]);
   1213 
   1214   for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
   1215     OS << ", ";
   1216     InstPrinter->printRegName(OS, RegList[i]);
   1217   }
   1218 
   1219   OS << "}";
   1220   EmitEOL();
   1221 }
   1222 
   1223 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
   1224   assert(getCurrentSection() && "Cannot emit contents before setting section!");
   1225 
   1226   // Show the encoding in a comment if we have a code emitter.
   1227   if (Emitter)
   1228     AddEncodingComment(Inst);
   1229 
   1230   // Show the MCInst if enabled.
   1231   if (ShowInst) {
   1232     Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
   1233     GetCommentOS() << "\n";
   1234   }
   1235 
   1236   // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
   1237   if (InstPrinter)
   1238     InstPrinter->printInst(&Inst, OS);
   1239   else
   1240     Inst.print(OS, &MAI);
   1241   EmitEOL();
   1242 }
   1243 
   1244 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
   1245 /// the specified string in the output .s file.  This capability is
   1246 /// indicated by the hasRawTextSupport() predicate.
   1247 void MCAsmStreamer::EmitRawText(StringRef String) {
   1248   if (!String.empty() && String.back() == '\n')
   1249     String = String.substr(0, String.size()-1);
   1250   OS << String;
   1251   EmitEOL();
   1252 }
   1253 
   1254 void MCAsmStreamer::Finish() {
   1255   // Dump out the dwarf file & directory tables and line tables.
   1256   if (getContext().hasDwarfFiles() && !UseLoc)
   1257     MCDwarfFileTable::Emit(this);
   1258 
   1259   if (!UseCFI)
   1260     EmitFrames(false);
   1261 }
   1262 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
   1263                                     formatted_raw_ostream &OS,
   1264                                     bool isVerboseAsm, bool useLoc,
   1265                                     bool useCFI, MCInstPrinter *IP,
   1266                                     MCCodeEmitter *CE, TargetAsmBackend *TAB,
   1267                                     bool ShowInst) {
   1268   return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc, useCFI,
   1269                            IP, CE, TAB, ShowInst);
   1270 }
   1271