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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/MCObjectFileInfo.h"
     19 #include "llvm/MC/MCRegisterInfo.h"
     20 #include "llvm/MC/MCSectionCOFF.h"
     21 #include "llvm/MC/MCSectionMachO.h"
     22 #include "llvm/MC/MCSymbol.h"
     23 #include "llvm/MC/MCAsmBackend.h"
     24 #include "llvm/ADT/OwningPtr.h"
     25 #include "llvm/ADT/SmallString.h"
     26 #include "llvm/ADT/StringExtras.h"
     27 #include "llvm/ADT/Twine.h"
     28 #include "llvm/Support/ErrorHandling.h"
     29 #include "llvm/Support/MathExtras.h"
     30 #include "llvm/Support/Format.h"
     31 #include "llvm/Support/FormattedStream.h"
     32 #include <cctype>
     33 using namespace llvm;
     34 
     35 namespace {
     36 
     37 class MCAsmStreamer : public MCStreamer {
     38 protected:
     39   formatted_raw_ostream &OS;
     40   const MCAsmInfo &MAI;
     41 private:
     42   OwningPtr<MCInstPrinter> InstPrinter;
     43   OwningPtr<MCCodeEmitter> Emitter;
     44   OwningPtr<MCAsmBackend> AsmBackend;
     45 
     46   SmallString<128> CommentToEmit;
     47   raw_svector_ostream CommentStream;
     48 
     49   unsigned IsVerboseAsm : 1;
     50   unsigned ShowInst : 1;
     51   unsigned UseLoc : 1;
     52   unsigned UseCFI : 1;
     53 
     54   enum EHSymbolFlags { EHGlobal         = 1,
     55                        EHWeakDefinition = 1 << 1,
     56                        EHPrivateExtern  = 1 << 2 };
     57   DenseMap<const MCSymbol*, unsigned> FlagMap;
     58 
     59   bool needsSet(const MCExpr *Value);
     60 
     61   void EmitRegisterName(int64_t Register);
     62 
     63 public:
     64   MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
     65                 bool isVerboseAsm, bool useLoc, bool useCFI,
     66                 MCInstPrinter *printer, MCCodeEmitter *emitter,
     67                 MCAsmBackend *asmbackend,
     68                 bool showInst)
     69     : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
     70       InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
     71       CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
     72       ShowInst(showInst), UseLoc(useLoc), UseCFI(useCFI) {
     73     if (InstPrinter && IsVerboseAsm)
     74       InstPrinter->setCommentStream(CommentStream);
     75   }
     76   ~MCAsmStreamer() {}
     77 
     78   inline void EmitEOL() {
     79     // If we don't have any comments, just emit a \n.
     80     if (!IsVerboseAsm) {
     81       OS << '\n';
     82       return;
     83     }
     84     EmitCommentsAndEOL();
     85   }
     86   void EmitCommentsAndEOL();
     87 
     88   /// isVerboseAsm - Return true if this streamer supports verbose assembly at
     89   /// all.
     90   virtual bool isVerboseAsm() const { return IsVerboseAsm; }
     91 
     92   /// hasRawTextSupport - We support EmitRawText.
     93   virtual bool hasRawTextSupport() const { return true; }
     94 
     95   /// AddComment - Add a comment that can be emitted to the generated .s
     96   /// file if applicable as a QoI issue to make the output of the compiler
     97   /// more readable.  This only affects the MCAsmStreamer, and only when
     98   /// verbose assembly output is enabled.
     99   virtual void AddComment(const Twine &T);
    100 
    101   /// AddEncodingComment - Add a comment showing the encoding of an instruction.
    102   virtual void AddEncodingComment(const MCInst &Inst);
    103 
    104   /// GetCommentOS - Return a raw_ostream that comments can be written to.
    105   /// Unlike AddComment, you are required to terminate comments with \n if you
    106   /// use this method.
    107   virtual raw_ostream &GetCommentOS() {
    108     if (!IsVerboseAsm)
    109       return nulls();  // Discard comments unless in verbose asm mode.
    110     return CommentStream;
    111   }
    112 
    113   /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
    114   virtual void AddBlankLine() {
    115     EmitEOL();
    116   }
    117 
    118   /// @name MCStreamer Interface
    119   /// @{
    120 
    121   virtual void ChangeSection(const MCSection *Section);
    122 
    123   virtual void InitSections() {
    124     // FIXME, this is MachO specific, but the testsuite
    125     // expects this.
    126     SwitchSection(getContext().getMachOSection("__TEXT", "__text",
    127                          MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
    128                          0, SectionKind::getText()));
    129   }
    130 
    131   virtual void EmitLabel(MCSymbol *Symbol);
    132   virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
    133                                    MCSymbol *EHSymbol);
    134   virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
    135   virtual void EmitThumbFunc(MCSymbol *Func);
    136 
    137   virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
    138   virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
    139   virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
    140                                         const MCSymbol *LastLabel,
    141                                         const MCSymbol *Label,
    142                                         unsigned PointerSize);
    143   virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
    144                                          const MCSymbol *Label);
    145 
    146   virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
    147 
    148   virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
    149   virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
    150   virtual void EmitCOFFSymbolStorageClass(int StorageClass);
    151   virtual void EmitCOFFSymbolType(int Type);
    152   virtual void EndCOFFSymbolDef();
    153   virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
    154   virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    155                                 unsigned ByteAlignment);
    156 
    157   /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
    158   ///
    159   /// @param Symbol - The common symbol to emit.
    160   /// @param Size - The size of the common symbol.
    161   /// @param Size - The alignment of the common symbol in bytes.
    162   virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    163                                      unsigned ByteAlignment);
    164 
    165   virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
    166                             unsigned Size = 0, unsigned ByteAlignment = 0);
    167 
    168   virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
    169                                uint64_t Size, unsigned ByteAlignment = 0);
    170 
    171   virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
    172 
    173   virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
    174                              unsigned AddrSpace);
    175   virtual void EmitIntValue(uint64_t Value, unsigned Size,
    176                             unsigned AddrSpace = 0);
    177 
    178   virtual void EmitULEB128Value(const MCExpr *Value);
    179 
    180   virtual void EmitSLEB128Value(const MCExpr *Value);
    181 
    182   virtual void EmitGPRel32Value(const MCExpr *Value);
    183 
    184 
    185   virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
    186                         unsigned AddrSpace);
    187 
    188   virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
    189                                     unsigned ValueSize = 1,
    190                                     unsigned MaxBytesToEmit = 0);
    191 
    192   virtual void EmitCodeAlignment(unsigned ByteAlignment,
    193                                  unsigned MaxBytesToEmit = 0);
    194 
    195   virtual void EmitValueToOffset(const MCExpr *Offset,
    196                                  unsigned char Value = 0);
    197 
    198   virtual void EmitFileDirective(StringRef Filename);
    199   virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
    200   virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    201                                      unsigned Column, unsigned Flags,
    202                                      unsigned Isa, unsigned Discriminator,
    203                                      StringRef FileName);
    204 
    205   virtual void EmitCFISections(bool EH, bool Debug);
    206   virtual void EmitCFIStartProc();
    207   virtual void EmitCFIEndProc();
    208   virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
    209   virtual void EmitCFIDefCfaOffset(int64_t Offset);
    210   virtual void EmitCFIDefCfaRegister(int64_t Register);
    211   virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
    212   virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
    213   virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
    214   virtual void EmitCFIRememberState();
    215   virtual void EmitCFIRestoreState();
    216   virtual void EmitCFISameValue(int64_t Register);
    217   virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
    218   virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
    219 
    220   virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
    221   virtual void EmitWin64EHEndProc();
    222   virtual void EmitWin64EHStartChained();
    223   virtual void EmitWin64EHEndChained();
    224   virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
    225                                   bool Except);
    226   virtual void EmitWin64EHHandlerData();
    227   virtual void EmitWin64EHPushReg(unsigned Register);
    228   virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset);
    229   virtual void EmitWin64EHAllocStack(unsigned Size);
    230   virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset);
    231   virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset);
    232   virtual void EmitWin64EHPushFrame(bool Code);
    233   virtual void EmitWin64EHEndProlog();
    234 
    235   virtual void EmitFnStart();
    236   virtual void EmitFnEnd();
    237   virtual void EmitCantUnwind();
    238   virtual void EmitPersonality(const MCSymbol *Personality);
    239   virtual void EmitHandlerData();
    240   virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
    241   virtual void EmitPad(int64_t Offset);
    242   virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
    243 
    244 
    245   virtual void EmitInstruction(const MCInst &Inst);
    246 
    247   /// EmitRawText - If this file is backed by an assembly streamer, this dumps
    248   /// the specified string in the output .s file.  This capability is
    249   /// indicated by the hasRawTextSupport() predicate.
    250   virtual void EmitRawText(StringRef String);
    251 
    252   virtual void Finish();
    253 
    254   /// @}
    255 };
    256 
    257 } // end anonymous namespace.
    258 
    259 /// AddComment - Add a comment that can be emitted to the generated .s
    260 /// file if applicable as a QoI issue to make the output of the compiler
    261 /// more readable.  This only affects the MCAsmStreamer, and only when
    262 /// verbose assembly output is enabled.
    263 void MCAsmStreamer::AddComment(const Twine &T) {
    264   if (!IsVerboseAsm) return;
    265 
    266   // Make sure that CommentStream is flushed.
    267   CommentStream.flush();
    268 
    269   T.toVector(CommentToEmit);
    270   // Each comment goes on its own line.
    271   CommentToEmit.push_back('\n');
    272 
    273   // Tell the comment stream that the vector changed underneath it.
    274   CommentStream.resync();
    275 }
    276 
    277 void MCAsmStreamer::EmitCommentsAndEOL() {
    278   if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
    279     OS << '\n';
    280     return;
    281   }
    282 
    283   CommentStream.flush();
    284   StringRef Comments = CommentToEmit.str();
    285 
    286   assert(Comments.back() == '\n' &&
    287          "Comment array not newline terminated");
    288   do {
    289     // Emit a line of comments.
    290     OS.PadToColumn(MAI.getCommentColumn());
    291     size_t Position = Comments.find('\n');
    292     OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
    293 
    294     Comments = Comments.substr(Position+1);
    295   } while (!Comments.empty());
    296 
    297   CommentToEmit.clear();
    298   // Tell the comment stream that the vector changed underneath it.
    299   CommentStream.resync();
    300 }
    301 
    302 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
    303   assert(Bytes && "Invalid size!");
    304   return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
    305 }
    306 
    307 void MCAsmStreamer::ChangeSection(const MCSection *Section) {
    308   assert(Section && "Cannot switch to a null section!");
    309   Section->PrintSwitchToSection(MAI, OS);
    310 }
    311 
    312 void MCAsmStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
    313                                         MCSymbol *EHSymbol) {
    314   if (UseCFI)
    315     return;
    316 
    317   unsigned Flags = FlagMap.lookup(Symbol);
    318 
    319   if (Flags & EHGlobal)
    320     EmitSymbolAttribute(EHSymbol, MCSA_Global);
    321   if (Flags & EHWeakDefinition)
    322     EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
    323   if (Flags & EHPrivateExtern)
    324     EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
    325 }
    326 
    327 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
    328   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
    329   MCStreamer::EmitLabel(Symbol);
    330 
    331   OS << *Symbol << MAI.getLabelSuffix();
    332   EmitEOL();
    333 }
    334 
    335 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
    336   switch (Flag) {
    337   default: assert(0 && "Invalid flag!");
    338   case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
    339   case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
    340   case MCAF_Code16:                OS << '\t'<< MAI.getCode16Directive(); break;
    341   case MCAF_Code32:                OS << '\t'<< MAI.getCode32Directive(); break;
    342   case MCAF_Code64:                OS << '\t'<< MAI.getCode64Directive(); break;
    343   }
    344   EmitEOL();
    345 }
    346 
    347 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
    348   // This needs to emit to a temporary string to get properly quoted
    349   // MCSymbols when they have spaces in them.
    350   OS << "\t.thumb_func";
    351   // Only Mach-O hasSubsectionsViaSymbols()
    352   if (MAI.hasSubsectionsViaSymbols())
    353     OS << '\t' << *Func;
    354   EmitEOL();
    355 }
    356 
    357 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
    358   OS << *Symbol << " = " << *Value;
    359   EmitEOL();
    360 
    361   // FIXME: Lift context changes into super class.
    362   Symbol->setVariableValue(Value);
    363 }
    364 
    365 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
    366   OS << ".weakref " << *Alias << ", " << *Symbol;
    367   EmitEOL();
    368 }
    369 
    370 void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
    371                                              const MCSymbol *LastLabel,
    372                                              const MCSymbol *Label,
    373                                              unsigned PointerSize) {
    374   EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
    375 }
    376 
    377 void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
    378                                               const MCSymbol *Label) {
    379   EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
    380   const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
    381   AddrDelta = ForceExpAbs(AddrDelta);
    382   EmitValue(AddrDelta, 4);
    383 }
    384 
    385 
    386 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
    387                                         MCSymbolAttr Attribute) {
    388   switch (Attribute) {
    389   case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
    390   case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
    391   case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
    392   case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
    393   case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
    394   case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
    395   case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
    396   case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
    397     assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
    398     OS << "\t.type\t" << *Symbol << ','
    399        << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
    400     switch (Attribute) {
    401     default: assert(0 && "Unknown ELF .type");
    402     case MCSA_ELF_TypeFunction:    OS << "function"; break;
    403     case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
    404     case MCSA_ELF_TypeObject:      OS << "object"; break;
    405     case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
    406     case MCSA_ELF_TypeCommon:      OS << "common"; break;
    407     case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
    408     case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
    409     }
    410     EmitEOL();
    411     return;
    412   case MCSA_Global: // .globl/.global
    413     OS << MAI.getGlobalDirective();
    414     FlagMap[Symbol] |= EHGlobal;
    415     break;
    416   case MCSA_Hidden:         OS << "\t.hidden\t";          break;
    417   case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
    418   case MCSA_Internal:       OS << "\t.internal\t";        break;
    419   case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
    420   case MCSA_Local:          OS << "\t.local\t";           break;
    421   case MCSA_NoDeadStrip:    OS << "\t.no_dead_strip\t";   break;
    422   case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
    423   case MCSA_PrivateExtern:
    424     OS << "\t.private_extern\t";
    425     FlagMap[Symbol] |= EHPrivateExtern;
    426     break;
    427   case MCSA_Protected:      OS << "\t.protected\t";       break;
    428   case MCSA_Reference:      OS << "\t.reference\t";       break;
    429   case MCSA_Weak:           OS << "\t.weak\t";            break;
    430   case MCSA_WeakDefinition:
    431     OS << "\t.weak_definition\t";
    432     FlagMap[Symbol] |= EHWeakDefinition;
    433     break;
    434       // .weak_reference
    435   case MCSA_WeakReference:  OS << MAI.getWeakRefDirective(); break;
    436   case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
    437   }
    438 
    439   OS << *Symbol;
    440   EmitEOL();
    441 }
    442 
    443 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
    444   OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
    445   EmitEOL();
    446 }
    447 
    448 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
    449   OS << "\t.def\t " << *Symbol << ';';
    450   EmitEOL();
    451 }
    452 
    453 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
    454   OS << "\t.scl\t" << StorageClass << ';';
    455   EmitEOL();
    456 }
    457 
    458 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
    459   OS << "\t.type\t" << Type << ';';
    460   EmitEOL();
    461 }
    462 
    463 void MCAsmStreamer::EndCOFFSymbolDef() {
    464   OS << "\t.endef";
    465   EmitEOL();
    466 }
    467 
    468 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
    469   assert(MAI.hasDotTypeDotSizeDirective());
    470   OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
    471 }
    472 
    473 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    474                                      unsigned ByteAlignment) {
    475   OS << "\t.comm\t" << *Symbol << ',' << Size;
    476   if (ByteAlignment != 0) {
    477     if (MAI.getCOMMDirectiveAlignmentIsInBytes())
    478       OS << ',' << ByteAlignment;
    479     else
    480       OS << ',' << Log2_32(ByteAlignment);
    481   }
    482   EmitEOL();
    483 }
    484 
    485 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
    486 ///
    487 /// @param Symbol - The common symbol to emit.
    488 /// @param Size - The size of the common symbol.
    489 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    490                                           unsigned ByteAlign) {
    491   assert(MAI.getLCOMMDirectiveType() != LCOMM::None &&
    492          "Doesn't have .lcomm, can't emit it!");
    493   OS << "\t.lcomm\t" << *Symbol << ',' << Size;
    494   if (ByteAlign > 1) {
    495     assert(MAI.getLCOMMDirectiveType() == LCOMM::ByteAlignment &&
    496            "Alignment not supported on .lcomm!");
    497     OS << ',' << ByteAlign;
    498   }
    499   EmitEOL();
    500 }
    501 
    502 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
    503                                  unsigned Size, unsigned ByteAlignment) {
    504   // Note: a .zerofill directive does not switch sections.
    505   OS << ".zerofill ";
    506 
    507   // This is a mach-o specific directive.
    508   const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
    509   OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
    510 
    511   if (Symbol != NULL) {
    512     OS << ',' << *Symbol << ',' << Size;
    513     if (ByteAlignment != 0)
    514       OS << ',' << Log2_32(ByteAlignment);
    515   }
    516   EmitEOL();
    517 }
    518 
    519 // .tbss sym, size, align
    520 // This depends that the symbol has already been mangled from the original,
    521 // e.g. _a.
    522 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
    523                                    uint64_t Size, unsigned ByteAlignment) {
    524   assert(Symbol != NULL && "Symbol shouldn't be NULL!");
    525   // Instead of using the Section we'll just use the shortcut.
    526   // This is a mach-o specific directive and section.
    527   OS << ".tbss " << *Symbol << ", " << Size;
    528 
    529   // Output align if we have it.  We default to 1 so don't bother printing
    530   // that.
    531   if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
    532 
    533   EmitEOL();
    534 }
    535 
    536 static inline char toOctal(int X) { return (X&7)+'0'; }
    537 
    538 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
    539   OS << '"';
    540 
    541   for (unsigned i = 0, e = Data.size(); i != e; ++i) {
    542     unsigned char C = Data[i];
    543     if (C == '"' || C == '\\') {
    544       OS << '\\' << (char)C;
    545       continue;
    546     }
    547 
    548     if (isprint((unsigned char)C)) {
    549       OS << (char)C;
    550       continue;
    551     }
    552 
    553     switch (C) {
    554       case '\b': OS << "\\b"; break;
    555       case '\f': OS << "\\f"; break;
    556       case '\n': OS << "\\n"; break;
    557       case '\r': OS << "\\r"; break;
    558       case '\t': OS << "\\t"; break;
    559       default:
    560         OS << '\\';
    561         OS << toOctal(C >> 6);
    562         OS << toOctal(C >> 3);
    563         OS << toOctal(C >> 0);
    564         break;
    565     }
    566   }
    567 
    568   OS << '"';
    569 }
    570 
    571 
    572 void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
    573   assert(getCurrentSection() && "Cannot emit contents before setting section!");
    574   if (Data.empty()) return;
    575 
    576   if (Data.size() == 1) {
    577     OS << MAI.getData8bitsDirective(AddrSpace);
    578     OS << (unsigned)(unsigned char)Data[0];
    579     EmitEOL();
    580     return;
    581   }
    582 
    583   // If the data ends with 0 and the target supports .asciz, use it, otherwise
    584   // use .ascii
    585   if (MAI.getAscizDirective() && Data.back() == 0) {
    586     OS << MAI.getAscizDirective();
    587     Data = Data.substr(0, Data.size()-1);
    588   } else {
    589     OS << MAI.getAsciiDirective();
    590   }
    591 
    592   OS << ' ';
    593   PrintQuotedString(Data, OS);
    594   EmitEOL();
    595 }
    596 
    597 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
    598                                  unsigned AddrSpace) {
    599   EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
    600 }
    601 
    602 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
    603                                   unsigned AddrSpace) {
    604   assert(getCurrentSection() && "Cannot emit contents before setting section!");
    605   const char *Directive = 0;
    606   switch (Size) {
    607   default: break;
    608   case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
    609   case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
    610   case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
    611   case 8:
    612     Directive = MAI.getData64bitsDirective(AddrSpace);
    613     // If the target doesn't support 64-bit data, emit as two 32-bit halves.
    614     if (Directive) break;
    615     int64_t IntValue;
    616     if (!Value->EvaluateAsAbsolute(IntValue))
    617       report_fatal_error("Don't know how to emit this value.");
    618     if (getContext().getAsmInfo().isLittleEndian()) {
    619       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
    620       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
    621     } else {
    622       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
    623       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
    624     }
    625     return;
    626   }
    627 
    628   assert(Directive && "Invalid size for machine code value!");
    629   OS << Directive << *Value;
    630   EmitEOL();
    631 }
    632 
    633 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
    634   int64_t IntValue;
    635   if (Value->EvaluateAsAbsolute(IntValue)) {
    636     EmitULEB128IntValue(IntValue);
    637     return;
    638   }
    639   assert(MAI.hasLEB128() && "Cannot print a .uleb");
    640   OS << ".uleb128 " << *Value;
    641   EmitEOL();
    642 }
    643 
    644 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
    645   int64_t IntValue;
    646   if (Value->EvaluateAsAbsolute(IntValue)) {
    647     EmitSLEB128IntValue(IntValue);
    648     return;
    649   }
    650   assert(MAI.hasLEB128() && "Cannot print a .sleb");
    651   OS << ".sleb128 " << *Value;
    652   EmitEOL();
    653 }
    654 
    655 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
    656   assert(MAI.getGPRel32Directive() != 0);
    657   OS << MAI.getGPRel32Directive() << *Value;
    658   EmitEOL();
    659 }
    660 
    661 
    662 /// EmitFill - Emit NumBytes bytes worth of the value specified by
    663 /// FillValue.  This implements directives such as '.space'.
    664 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
    665                              unsigned AddrSpace) {
    666   if (NumBytes == 0) return;
    667 
    668   if (AddrSpace == 0)
    669     if (const char *ZeroDirective = MAI.getZeroDirective()) {
    670       OS << ZeroDirective << NumBytes;
    671       if (FillValue != 0)
    672         OS << ',' << (int)FillValue;
    673       EmitEOL();
    674       return;
    675     }
    676 
    677   // Emit a byte at a time.
    678   MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
    679 }
    680 
    681 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
    682                                          unsigned ValueSize,
    683                                          unsigned MaxBytesToEmit) {
    684   // Some assemblers don't support non-power of two alignments, so we always
    685   // emit alignments as a power of two if possible.
    686   if (isPowerOf2_32(ByteAlignment)) {
    687     switch (ValueSize) {
    688     default: llvm_unreachable("Invalid size for machine code value!");
    689     case 1: OS << MAI.getAlignDirective(); break;
    690     // FIXME: use MAI for this!
    691     case 2: OS << ".p2alignw "; break;
    692     case 4: OS << ".p2alignl "; break;
    693     case 8: llvm_unreachable("Unsupported alignment size!");
    694     }
    695 
    696     if (MAI.getAlignmentIsInBytes())
    697       OS << ByteAlignment;
    698     else
    699       OS << Log2_32(ByteAlignment);
    700 
    701     if (Value || MaxBytesToEmit) {
    702       OS << ", 0x";
    703       OS.write_hex(truncateToSize(Value, ValueSize));
    704 
    705       if (MaxBytesToEmit)
    706         OS << ", " << MaxBytesToEmit;
    707     }
    708     EmitEOL();
    709     return;
    710   }
    711 
    712   // Non-power of two alignment.  This is not widely supported by assemblers.
    713   // FIXME: Parameterize this based on MAI.
    714   switch (ValueSize) {
    715   default: llvm_unreachable("Invalid size for machine code value!");
    716   case 1: OS << ".balign";  break;
    717   case 2: OS << ".balignw"; break;
    718   case 4: OS << ".balignl"; break;
    719   case 8: llvm_unreachable("Unsupported alignment size!");
    720   }
    721 
    722   OS << ' ' << ByteAlignment;
    723   OS << ", " << truncateToSize(Value, ValueSize);
    724   if (MaxBytesToEmit)
    725     OS << ", " << MaxBytesToEmit;
    726   EmitEOL();
    727 }
    728 
    729 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
    730                                       unsigned MaxBytesToEmit) {
    731   // Emit with a text fill value.
    732   EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
    733                        1, MaxBytesToEmit);
    734 }
    735 
    736 void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
    737                                       unsigned char Value) {
    738   // FIXME: Verify that Offset is associated with the current section.
    739   OS << ".org " << *Offset << ", " << (unsigned) Value;
    740   EmitEOL();
    741 }
    742 
    743 
    744 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
    745   assert(MAI.hasSingleParameterDotFile());
    746   OS << "\t.file\t";
    747   PrintQuotedString(Filename, OS);
    748   EmitEOL();
    749 }
    750 
    751 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
    752   if (UseLoc) {
    753     OS << "\t.file\t" << FileNo << ' ';
    754     PrintQuotedString(Filename, OS);
    755     EmitEOL();
    756   }
    757   return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
    758 }
    759 
    760 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    761                                           unsigned Column, unsigned Flags,
    762                                           unsigned Isa,
    763                                           unsigned Discriminator,
    764                                           StringRef FileName) {
    765   this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
    766                                           Isa, Discriminator, FileName);
    767   if (!UseLoc)
    768     return;
    769 
    770   OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
    771   if (Flags & DWARF2_FLAG_BASIC_BLOCK)
    772     OS << " basic_block";
    773   if (Flags & DWARF2_FLAG_PROLOGUE_END)
    774     OS << " prologue_end";
    775   if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
    776     OS << " epilogue_begin";
    777 
    778   unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
    779   if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
    780     OS << " is_stmt ";
    781 
    782     if (Flags & DWARF2_FLAG_IS_STMT)
    783       OS << "1";
    784     else
    785       OS << "0";
    786   }
    787 
    788   if (Isa)
    789     OS << "isa " << Isa;
    790   if (Discriminator)
    791     OS << "discriminator " << Discriminator;
    792 
    793   if (IsVerboseAsm) {
    794     OS.PadToColumn(MAI.getCommentColumn());
    795     OS << MAI.getCommentString() << ' ' << FileName << ':'
    796        << Line << ':' << Column;
    797   }
    798   EmitEOL();
    799 }
    800 
    801 void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
    802   MCStreamer::EmitCFISections(EH, Debug);
    803 
    804   if (!UseCFI)
    805     return;
    806 
    807   OS << "\t.cfi_sections ";
    808   if (EH) {
    809     OS << ".eh_frame";
    810     if (Debug)
    811       OS << ", .debug_frame";
    812   } else if (Debug) {
    813     OS << ".debug_frame";
    814   }
    815 
    816   EmitEOL();
    817 }
    818 
    819 void MCAsmStreamer::EmitCFIStartProc() {
    820   MCStreamer::EmitCFIStartProc();
    821 
    822   if (!UseCFI)
    823     return;
    824 
    825   OS << "\t.cfi_startproc";
    826   EmitEOL();
    827 }
    828 
    829 void MCAsmStreamer::EmitCFIEndProc() {
    830   MCStreamer::EmitCFIEndProc();
    831 
    832   if (!UseCFI)
    833     return;
    834 
    835   OS << "\t.cfi_endproc";
    836   EmitEOL();
    837 }
    838 
    839 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
    840   if (InstPrinter && !MAI.useDwarfRegNumForCFI()) {
    841     const MCRegisterInfo &MRI = getContext().getRegisterInfo();
    842     unsigned LLVMRegister = MRI.getLLVMRegNum(Register, true);
    843     InstPrinter->printRegName(OS, LLVMRegister);
    844   } else {
    845     OS << Register;
    846   }
    847 }
    848 
    849 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
    850   MCStreamer::EmitCFIDefCfa(Register, Offset);
    851 
    852   if (!UseCFI)
    853     return;
    854 
    855   OS << "\t.cfi_def_cfa ";
    856   EmitRegisterName(Register);
    857   OS << ", " << Offset;
    858   EmitEOL();
    859 }
    860 
    861 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
    862   MCStreamer::EmitCFIDefCfaOffset(Offset);
    863 
    864   if (!UseCFI)
    865     return;
    866 
    867   OS << "\t.cfi_def_cfa_offset " << Offset;
    868   EmitEOL();
    869 }
    870 
    871 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
    872   MCStreamer::EmitCFIDefCfaRegister(Register);
    873 
    874   if (!UseCFI)
    875     return;
    876 
    877   OS << "\t.cfi_def_cfa_register ";
    878   EmitRegisterName(Register);
    879   EmitEOL();
    880 }
    881 
    882 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
    883   this->MCStreamer::EmitCFIOffset(Register, Offset);
    884 
    885   if (!UseCFI)
    886     return;
    887 
    888   OS << "\t.cfi_offset ";
    889   EmitRegisterName(Register);
    890   OS << ", " << Offset;
    891   EmitEOL();
    892 }
    893 
    894 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
    895                                        unsigned Encoding) {
    896   MCStreamer::EmitCFIPersonality(Sym, Encoding);
    897 
    898   if (!UseCFI)
    899     return;
    900 
    901   OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
    902   EmitEOL();
    903 }
    904 
    905 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
    906   MCStreamer::EmitCFILsda(Sym, Encoding);
    907 
    908   if (!UseCFI)
    909     return;
    910 
    911   OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
    912   EmitEOL();
    913 }
    914 
    915 void MCAsmStreamer::EmitCFIRememberState() {
    916   MCStreamer::EmitCFIRememberState();
    917 
    918   if (!UseCFI)
    919     return;
    920 
    921   OS << "\t.cfi_remember_state";
    922   EmitEOL();
    923 }
    924 
    925 void MCAsmStreamer::EmitCFIRestoreState() {
    926   MCStreamer::EmitCFIRestoreState();
    927 
    928   if (!UseCFI)
    929     return;
    930 
    931   OS << "\t.cfi_restore_state";
    932   EmitEOL();
    933 }
    934 
    935 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
    936   MCStreamer::EmitCFISameValue(Register);
    937 
    938   if (!UseCFI)
    939     return;
    940 
    941   OS << "\t.cfi_same_value ";
    942   EmitRegisterName(Register);
    943   EmitEOL();
    944 }
    945 
    946 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
    947   MCStreamer::EmitCFIRelOffset(Register, Offset);
    948 
    949   if (!UseCFI)
    950     return;
    951 
    952   OS << "\t.cfi_rel_offset ";
    953   EmitRegisterName(Register);
    954   OS << ", " << Offset;
    955   EmitEOL();
    956 }
    957 
    958 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
    959   MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
    960 
    961   if (!UseCFI)
    962     return;
    963 
    964   OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
    965   EmitEOL();
    966 }
    967 
    968 void MCAsmStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
    969   MCStreamer::EmitWin64EHStartProc(Symbol);
    970 
    971   OS << ".seh_proc " << *Symbol;
    972   EmitEOL();
    973 }
    974 
    975 void MCAsmStreamer::EmitWin64EHEndProc() {
    976   MCStreamer::EmitWin64EHEndProc();
    977 
    978   OS << "\t.seh_endproc";
    979   EmitEOL();
    980 }
    981 
    982 void MCAsmStreamer::EmitWin64EHStartChained() {
    983   MCStreamer::EmitWin64EHStartChained();
    984 
    985   OS << "\t.seh_startchained";
    986   EmitEOL();
    987 }
    988 
    989 void MCAsmStreamer::EmitWin64EHEndChained() {
    990   MCStreamer::EmitWin64EHEndChained();
    991 
    992   OS << "\t.seh_endchained";
    993   EmitEOL();
    994 }
    995 
    996 void MCAsmStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
    997                                        bool Except) {
    998   MCStreamer::EmitWin64EHHandler(Sym, Unwind, Except);
    999 
   1000   OS << "\t.seh_handler " << *Sym;
   1001   if (Unwind)
   1002     OS << ", @unwind";
   1003   if (Except)
   1004     OS << ", @except";
   1005   EmitEOL();
   1006 }
   1007 
   1008 static const MCSection *getWin64EHTableSection(StringRef suffix,
   1009                                                MCContext &context) {
   1010   // FIXME: This doesn't belong in MCObjectFileInfo. However,
   1011   /// this duplicate code in MCWin64EH.cpp.
   1012   if (suffix == "")
   1013     return context.getObjectFileInfo()->getXDataSection();
   1014   return context.getCOFFSection((".xdata"+suffix).str(),
   1015                                 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
   1016                                 COFF::IMAGE_SCN_MEM_READ |
   1017                                 COFF::IMAGE_SCN_MEM_WRITE,
   1018                                 SectionKind::getDataRel());
   1019 }
   1020 
   1021 void MCAsmStreamer::EmitWin64EHHandlerData() {
   1022   MCStreamer::EmitWin64EHHandlerData();
   1023 
   1024   // Switch sections. Don't call SwitchSection directly, because that will
   1025   // cause the section switch to be visible in the emitted assembly.
   1026   // We only do this so the section switch that terminates the handler
   1027   // data block is visible.
   1028   MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
   1029   StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
   1030   const MCSection *xdataSect = getWin64EHTableSection(suffix, getContext());
   1031   if (xdataSect)
   1032     SwitchSectionNoChange(xdataSect);
   1033 
   1034   OS << "\t.seh_handlerdata";
   1035   EmitEOL();
   1036 }
   1037 
   1038 void MCAsmStreamer::EmitWin64EHPushReg(unsigned Register) {
   1039   MCStreamer::EmitWin64EHPushReg(Register);
   1040 
   1041   OS << "\t.seh_pushreg " << Register;
   1042   EmitEOL();
   1043 }
   1044 
   1045 void MCAsmStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
   1046   MCStreamer::EmitWin64EHSetFrame(Register, Offset);
   1047 
   1048   OS << "\t.seh_setframe " << Register << ", " << Offset;
   1049   EmitEOL();
   1050 }
   1051 
   1052 void MCAsmStreamer::EmitWin64EHAllocStack(unsigned Size) {
   1053   MCStreamer::EmitWin64EHAllocStack(Size);
   1054 
   1055   OS << "\t.seh_stackalloc " << Size;
   1056   EmitEOL();
   1057 }
   1058 
   1059 void MCAsmStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
   1060   MCStreamer::EmitWin64EHSaveReg(Register, Offset);
   1061 
   1062   OS << "\t.seh_savereg " << Register << ", " << Offset;
   1063   EmitEOL();
   1064 }
   1065 
   1066 void MCAsmStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
   1067   MCStreamer::EmitWin64EHSaveXMM(Register, Offset);
   1068 
   1069   OS << "\t.seh_savexmm " << Register << ", " << Offset;
   1070   EmitEOL();
   1071 }
   1072 
   1073 void MCAsmStreamer::EmitWin64EHPushFrame(bool Code) {
   1074   MCStreamer::EmitWin64EHPushFrame(Code);
   1075 
   1076   OS << "\t.seh_pushframe";
   1077   if (Code)
   1078     OS << " @code";
   1079   EmitEOL();
   1080 }
   1081 
   1082 void MCAsmStreamer::EmitWin64EHEndProlog(void) {
   1083   MCStreamer::EmitWin64EHEndProlog();
   1084 
   1085   OS << "\t.seh_endprologue";
   1086   EmitEOL();
   1087 }
   1088 
   1089 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
   1090   raw_ostream &OS = GetCommentOS();
   1091   SmallString<256> Code;
   1092   SmallVector<MCFixup, 4> Fixups;
   1093   raw_svector_ostream VecOS(Code);
   1094   Emitter->EncodeInstruction(Inst, VecOS, Fixups);
   1095   VecOS.flush();
   1096 
   1097   // If we are showing fixups, create symbolic markers in the encoded
   1098   // representation. We do this by making a per-bit map to the fixup item index,
   1099   // then trying to display it as nicely as possible.
   1100   SmallVector<uint8_t, 64> FixupMap;
   1101   FixupMap.resize(Code.size() * 8);
   1102   for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
   1103     FixupMap[i] = 0;
   1104 
   1105   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
   1106     MCFixup &F = Fixups[i];
   1107     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
   1108     for (unsigned j = 0; j != Info.TargetSize; ++j) {
   1109       unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
   1110       assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
   1111       FixupMap[Index] = 1 + i;
   1112     }
   1113   }
   1114 
   1115   // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
   1116   // high order halfword of a 32-bit Thumb2 instruction is emitted first.
   1117   OS << "encoding: [";
   1118   for (unsigned i = 0, e = Code.size(); i != e; ++i) {
   1119     if (i)
   1120       OS << ',';
   1121 
   1122     // See if all bits are the same map entry.
   1123     uint8_t MapEntry = FixupMap[i * 8 + 0];
   1124     for (unsigned j = 1; j != 8; ++j) {
   1125       if (FixupMap[i * 8 + j] == MapEntry)
   1126         continue;
   1127 
   1128       MapEntry = uint8_t(~0U);
   1129       break;
   1130     }
   1131 
   1132     if (MapEntry != uint8_t(~0U)) {
   1133       if (MapEntry == 0) {
   1134         OS << format("0x%02x", uint8_t(Code[i]));
   1135       } else {
   1136         if (Code[i]) {
   1137           // FIXME: Some of the 8 bits require fix up.
   1138           OS << format("0x%02x", uint8_t(Code[i])) << '\''
   1139              << char('A' + MapEntry - 1) << '\'';
   1140         } else
   1141           OS << char('A' + MapEntry - 1);
   1142       }
   1143     } else {
   1144       // Otherwise, write out in binary.
   1145       OS << "0b";
   1146       for (unsigned j = 8; j--;) {
   1147         unsigned Bit = (Code[i] >> j) & 1;
   1148 
   1149         unsigned FixupBit;
   1150         if (getContext().getAsmInfo().isLittleEndian())
   1151           FixupBit = i * 8 + j;
   1152         else
   1153           FixupBit = i * 8 + (7-j);
   1154 
   1155         if (uint8_t MapEntry = FixupMap[FixupBit]) {
   1156           assert(Bit == 0 && "Encoder wrote into fixed up bit!");
   1157           OS << char('A' + MapEntry - 1);
   1158         } else
   1159           OS << Bit;
   1160       }
   1161     }
   1162   }
   1163   OS << "]\n";
   1164 
   1165   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
   1166     MCFixup &F = Fixups[i];
   1167     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
   1168     OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
   1169        << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
   1170   }
   1171 }
   1172 
   1173 void MCAsmStreamer::EmitFnStart() {
   1174   OS << "\t.fnstart";
   1175   EmitEOL();
   1176 }
   1177 
   1178 void MCAsmStreamer::EmitFnEnd() {
   1179   OS << "\t.fnend";
   1180   EmitEOL();
   1181 }
   1182 
   1183 void MCAsmStreamer::EmitCantUnwind() {
   1184   OS << "\t.cantunwind";
   1185   EmitEOL();
   1186 }
   1187 
   1188 void MCAsmStreamer::EmitHandlerData() {
   1189   OS << "\t.handlerdata";
   1190   EmitEOL();
   1191 }
   1192 
   1193 void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
   1194   OS << "\t.personality " << Personality->getName();
   1195   EmitEOL();
   1196 }
   1197 
   1198 void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
   1199   OS << "\t.setfp\t";
   1200   InstPrinter->printRegName(OS, FpReg);
   1201   OS << ", ";
   1202   InstPrinter->printRegName(OS, SpReg);
   1203   if (Offset)
   1204     OS << ", #" << Offset;
   1205   EmitEOL();
   1206 }
   1207 
   1208 void MCAsmStreamer::EmitPad(int64_t Offset) {
   1209   OS << "\t.pad\t#" << Offset;
   1210   EmitEOL();
   1211 }
   1212 
   1213 void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
   1214                                 bool isVector) {
   1215   assert(RegList.size() && "RegList should not be empty");
   1216   if (isVector)
   1217     OS << "\t.vsave\t{";
   1218   else
   1219     OS << "\t.save\t{";
   1220 
   1221   InstPrinter->printRegName(OS, RegList[0]);
   1222 
   1223   for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
   1224     OS << ", ";
   1225     InstPrinter->printRegName(OS, RegList[i]);
   1226   }
   1227 
   1228   OS << "}";
   1229   EmitEOL();
   1230 }
   1231 
   1232 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
   1233   assert(getCurrentSection() && "Cannot emit contents before setting section!");
   1234 
   1235   // Show the encoding in a comment if we have a code emitter.
   1236   if (Emitter)
   1237     AddEncodingComment(Inst);
   1238 
   1239   // Show the MCInst if enabled.
   1240   if (ShowInst) {
   1241     Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
   1242     GetCommentOS() << "\n";
   1243   }
   1244 
   1245   // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
   1246   if (InstPrinter)
   1247     InstPrinter->printInst(&Inst, OS, "");
   1248   else
   1249     Inst.print(OS, &MAI);
   1250   EmitEOL();
   1251 }
   1252 
   1253 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
   1254 /// the specified string in the output .s file.  This capability is
   1255 /// indicated by the hasRawTextSupport() predicate.
   1256 void MCAsmStreamer::EmitRawText(StringRef String) {
   1257   if (!String.empty() && String.back() == '\n')
   1258     String = String.substr(0, String.size()-1);
   1259   OS << String;
   1260   EmitEOL();
   1261 }
   1262 
   1263 void MCAsmStreamer::Finish() {
   1264   // Dump out the dwarf file & directory tables and line tables.
   1265   if (getContext().hasDwarfFiles() && !UseLoc)
   1266     MCDwarfFileTable::Emit(this);
   1267 
   1268   if (!UseCFI)
   1269     EmitFrames(false);
   1270 }
   1271 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
   1272                                     formatted_raw_ostream &OS,
   1273                                     bool isVerboseAsm, bool useLoc,
   1274                                     bool useCFI, MCInstPrinter *IP,
   1275                                     MCCodeEmitter *CE, MCAsmBackend *MAB,
   1276                                     bool ShowInst) {
   1277   return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc, useCFI,
   1278                            IP, CE, MAB, ShowInst);
   1279 }
   1280