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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 "llvm/Support/PathV2.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<MCAsmBackend> 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   unsigned UseDwarfDirectory : 1;
     55 
     56   enum EHSymbolFlags { EHGlobal         = 1,
     57                        EHWeakDefinition = 1 << 1,
     58                        EHPrivateExtern  = 1 << 2 };
     59   DenseMap<const MCSymbol*, unsigned> FlagMap;
     60 
     61   bool needsSet(const MCExpr *Value);
     62 
     63   void EmitRegisterName(int64_t Register);
     64 
     65 public:
     66   MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
     67                 bool isVerboseAsm, bool useLoc, bool useCFI,
     68                 bool useDwarfDirectory,
     69                 MCInstPrinter *printer, MCCodeEmitter *emitter,
     70                 MCAsmBackend *asmbackend,
     71                 bool showInst)
     72     : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
     73       InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
     74       CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
     75       ShowInst(showInst), UseLoc(useLoc), UseCFI(useCFI),
     76       UseDwarfDirectory(useDwarfDirectory) {
     77     if (InstPrinter && IsVerboseAsm)
     78       InstPrinter->setCommentStream(CommentStream);
     79   }
     80   ~MCAsmStreamer() {}
     81 
     82   inline void EmitEOL() {
     83     // If we don't have any comments, just emit a \n.
     84     if (!IsVerboseAsm) {
     85       OS << '\n';
     86       return;
     87     }
     88     EmitCommentsAndEOL();
     89   }
     90   void EmitCommentsAndEOL();
     91 
     92   /// isVerboseAsm - Return true if this streamer supports verbose assembly at
     93   /// all.
     94   virtual bool isVerboseAsm() const { return IsVerboseAsm; }
     95 
     96   /// hasRawTextSupport - We support EmitRawText.
     97   virtual bool hasRawTextSupport() const { return true; }
     98 
     99   /// AddComment - Add a comment that can be emitted to the generated .s
    100   /// file if applicable as a QoI issue to make the output of the compiler
    101   /// more readable.  This only affects the MCAsmStreamer, and only when
    102   /// verbose assembly output is enabled.
    103   virtual void AddComment(const Twine &T);
    104 
    105   /// AddEncodingComment - Add a comment showing the encoding of an instruction.
    106   virtual void AddEncodingComment(const MCInst &Inst);
    107 
    108   /// GetCommentOS - Return a raw_ostream that comments can be written to.
    109   /// Unlike AddComment, you are required to terminate comments with \n if you
    110   /// use this method.
    111   virtual raw_ostream &GetCommentOS() {
    112     if (!IsVerboseAsm)
    113       return nulls();  // Discard comments unless in verbose asm mode.
    114     return CommentStream;
    115   }
    116 
    117   /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
    118   virtual void AddBlankLine() {
    119     EmitEOL();
    120   }
    121 
    122   /// @name MCStreamer Interface
    123   /// @{
    124 
    125   virtual void ChangeSection(const MCSection *Section);
    126 
    127   virtual void InitSections() {
    128     // FIXME, this is MachO specific, but the testsuite
    129     // expects this.
    130     SwitchSection(getContext().getMachOSection("__TEXT", "__text",
    131                          MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
    132                          0, SectionKind::getText()));
    133   }
    134 
    135   virtual void EmitLabel(MCSymbol *Symbol);
    136   virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
    137                                    MCSymbol *EHSymbol);
    138   virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
    139   virtual void EmitThumbFunc(MCSymbol *Func);
    140 
    141   virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
    142   virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
    143   virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
    144                                         const MCSymbol *LastLabel,
    145                                         const MCSymbol *Label,
    146                                         unsigned PointerSize);
    147   virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
    148                                          const MCSymbol *Label);
    149 
    150   virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
    151 
    152   virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
    153   virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
    154   virtual void EmitCOFFSymbolStorageClass(int StorageClass);
    155   virtual void EmitCOFFSymbolType(int Type);
    156   virtual void EndCOFFSymbolDef();
    157   virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
    158   virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    159                                 unsigned ByteAlignment);
    160 
    161   /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
    162   ///
    163   /// @param Symbol - The common symbol to emit.
    164   /// @param Size - The size of the common symbol.
    165   /// @param Size - The alignment of the common symbol in bytes.
    166   virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    167                                      unsigned ByteAlignment);
    168 
    169   virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
    170                             unsigned Size = 0, unsigned ByteAlignment = 0);
    171 
    172   virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
    173                                uint64_t Size, unsigned ByteAlignment = 0);
    174 
    175   virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
    176 
    177   virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
    178                              unsigned AddrSpace);
    179   virtual void EmitIntValue(uint64_t Value, unsigned Size,
    180                             unsigned AddrSpace = 0);
    181 
    182   virtual void EmitULEB128Value(const MCExpr *Value);
    183 
    184   virtual void EmitSLEB128Value(const MCExpr *Value);
    185 
    186   virtual void EmitGPRel32Value(const MCExpr *Value);
    187 
    188 
    189   virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
    190                         unsigned AddrSpace);
    191 
    192   virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
    193                                     unsigned ValueSize = 1,
    194                                     unsigned MaxBytesToEmit = 0);
    195 
    196   virtual void EmitCodeAlignment(unsigned ByteAlignment,
    197                                  unsigned MaxBytesToEmit = 0);
    198 
    199   virtual void EmitValueToOffset(const MCExpr *Offset,
    200                                  unsigned char Value = 0);
    201 
    202   virtual void EmitFileDirective(StringRef Filename);
    203   virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
    204                                       StringRef Filename);
    205   virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    206                                      unsigned Column, unsigned Flags,
    207                                      unsigned Isa, unsigned Discriminator,
    208                                      StringRef FileName);
    209 
    210   virtual void EmitCFISections(bool EH, bool Debug);
    211   virtual void EmitCFIStartProc();
    212   virtual void EmitCFIEndProc();
    213   virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
    214   virtual void EmitCFIDefCfaOffset(int64_t Offset);
    215   virtual void EmitCFIDefCfaRegister(int64_t Register);
    216   virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
    217   virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
    218   virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
    219   virtual void EmitCFIRememberState();
    220   virtual void EmitCFIRestoreState();
    221   virtual void EmitCFISameValue(int64_t Register);
    222   virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
    223   virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
    224 
    225   virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
    226   virtual void EmitWin64EHEndProc();
    227   virtual void EmitWin64EHStartChained();
    228   virtual void EmitWin64EHEndChained();
    229   virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
    230                                   bool Except);
    231   virtual void EmitWin64EHHandlerData();
    232   virtual void EmitWin64EHPushReg(unsigned Register);
    233   virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset);
    234   virtual void EmitWin64EHAllocStack(unsigned Size);
    235   virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset);
    236   virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset);
    237   virtual void EmitWin64EHPushFrame(bool Code);
    238   virtual void EmitWin64EHEndProlog();
    239 
    240   virtual void EmitFnStart();
    241   virtual void EmitFnEnd();
    242   virtual void EmitCantUnwind();
    243   virtual void EmitPersonality(const MCSymbol *Personality);
    244   virtual void EmitHandlerData();
    245   virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
    246   virtual void EmitPad(int64_t Offset);
    247   virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
    248 
    249 
    250   virtual void EmitInstruction(const MCInst &Inst);
    251 
    252   /// EmitRawText - If this file is backed by an assembly streamer, this dumps
    253   /// the specified string in the output .s file.  This capability is
    254   /// indicated by the hasRawTextSupport() predicate.
    255   virtual void EmitRawText(StringRef String);
    256 
    257   virtual void Finish();
    258 
    259   /// @}
    260 };
    261 
    262 } // end anonymous namespace.
    263 
    264 /// AddComment - Add a comment that can be emitted to the generated .s
    265 /// file if applicable as a QoI issue to make the output of the compiler
    266 /// more readable.  This only affects the MCAsmStreamer, and only when
    267 /// verbose assembly output is enabled.
    268 void MCAsmStreamer::AddComment(const Twine &T) {
    269   if (!IsVerboseAsm) return;
    270 
    271   // Make sure that CommentStream is flushed.
    272   CommentStream.flush();
    273 
    274   T.toVector(CommentToEmit);
    275   // Each comment goes on its own line.
    276   CommentToEmit.push_back('\n');
    277 
    278   // Tell the comment stream that the vector changed underneath it.
    279   CommentStream.resync();
    280 }
    281 
    282 void MCAsmStreamer::EmitCommentsAndEOL() {
    283   if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
    284     OS << '\n';
    285     return;
    286   }
    287 
    288   CommentStream.flush();
    289   StringRef Comments = CommentToEmit.str();
    290 
    291   assert(Comments.back() == '\n' &&
    292          "Comment array not newline terminated");
    293   do {
    294     // Emit a line of comments.
    295     OS.PadToColumn(MAI.getCommentColumn());
    296     size_t Position = Comments.find('\n');
    297     OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
    298 
    299     Comments = Comments.substr(Position+1);
    300   } while (!Comments.empty());
    301 
    302   CommentToEmit.clear();
    303   // Tell the comment stream that the vector changed underneath it.
    304   CommentStream.resync();
    305 }
    306 
    307 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
    308   assert(Bytes && "Invalid size!");
    309   return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
    310 }
    311 
    312 void MCAsmStreamer::ChangeSection(const MCSection *Section) {
    313   assert(Section && "Cannot switch to a null section!");
    314   Section->PrintSwitchToSection(MAI, OS);
    315 }
    316 
    317 void MCAsmStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
    318                                         MCSymbol *EHSymbol) {
    319   if (UseCFI)
    320     return;
    321 
    322   unsigned Flags = FlagMap.lookup(Symbol);
    323 
    324   if (Flags & EHGlobal)
    325     EmitSymbolAttribute(EHSymbol, MCSA_Global);
    326   if (Flags & EHWeakDefinition)
    327     EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
    328   if (Flags & EHPrivateExtern)
    329     EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
    330 }
    331 
    332 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
    333   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
    334   MCStreamer::EmitLabel(Symbol);
    335 
    336   OS << *Symbol << MAI.getLabelSuffix();
    337   EmitEOL();
    338 }
    339 
    340 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
    341   switch (Flag) {
    342   default: assert(0 && "Invalid flag!");
    343   case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
    344   case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
    345   case MCAF_Code16:                OS << '\t'<< MAI.getCode16Directive(); break;
    346   case MCAF_Code32:                OS << '\t'<< MAI.getCode32Directive(); break;
    347   case MCAF_Code64:                OS << '\t'<< MAI.getCode64Directive(); break;
    348   }
    349   EmitEOL();
    350 }
    351 
    352 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
    353   // This needs to emit to a temporary string to get properly quoted
    354   // MCSymbols when they have spaces in them.
    355   OS << "\t.thumb_func";
    356   // Only Mach-O hasSubsectionsViaSymbols()
    357   if (MAI.hasSubsectionsViaSymbols())
    358     OS << '\t' << *Func;
    359   EmitEOL();
    360 }
    361 
    362 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
    363   OS << *Symbol << " = " << *Value;
    364   EmitEOL();
    365 
    366   // FIXME: Lift context changes into super class.
    367   Symbol->setVariableValue(Value);
    368 }
    369 
    370 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
    371   OS << ".weakref " << *Alias << ", " << *Symbol;
    372   EmitEOL();
    373 }
    374 
    375 void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
    376                                              const MCSymbol *LastLabel,
    377                                              const MCSymbol *Label,
    378                                              unsigned PointerSize) {
    379   EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
    380 }
    381 
    382 void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
    383                                               const MCSymbol *Label) {
    384   EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
    385   const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
    386   AddrDelta = ForceExpAbs(AddrDelta);
    387   EmitValue(AddrDelta, 4);
    388 }
    389 
    390 
    391 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
    392                                         MCSymbolAttr Attribute) {
    393   switch (Attribute) {
    394   case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
    395   case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
    396   case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
    397   case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
    398   case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
    399   case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
    400   case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
    401   case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
    402     assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
    403     OS << "\t.type\t" << *Symbol << ','
    404        << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
    405     switch (Attribute) {
    406     default: assert(0 && "Unknown ELF .type");
    407     case MCSA_ELF_TypeFunction:    OS << "function"; break;
    408     case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
    409     case MCSA_ELF_TypeObject:      OS << "object"; break;
    410     case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
    411     case MCSA_ELF_TypeCommon:      OS << "common"; break;
    412     case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
    413     case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
    414     }
    415     EmitEOL();
    416     return;
    417   case MCSA_Global: // .globl/.global
    418     OS << MAI.getGlobalDirective();
    419     FlagMap[Symbol] |= EHGlobal;
    420     break;
    421   case MCSA_Hidden:         OS << "\t.hidden\t";          break;
    422   case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
    423   case MCSA_Internal:       OS << "\t.internal\t";        break;
    424   case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
    425   case MCSA_Local:          OS << "\t.local\t";           break;
    426   case MCSA_NoDeadStrip:    OS << "\t.no_dead_strip\t";   break;
    427   case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
    428   case MCSA_PrivateExtern:
    429     OS << "\t.private_extern\t";
    430     FlagMap[Symbol] |= EHPrivateExtern;
    431     break;
    432   case MCSA_Protected:      OS << "\t.protected\t";       break;
    433   case MCSA_Reference:      OS << "\t.reference\t";       break;
    434   case MCSA_Weak:           OS << "\t.weak\t";            break;
    435   case MCSA_WeakDefinition:
    436     OS << "\t.weak_definition\t";
    437     FlagMap[Symbol] |= EHWeakDefinition;
    438     break;
    439       // .weak_reference
    440   case MCSA_WeakReference:  OS << MAI.getWeakRefDirective(); break;
    441   case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
    442   }
    443 
    444   OS << *Symbol;
    445   EmitEOL();
    446 }
    447 
    448 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
    449   OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
    450   EmitEOL();
    451 }
    452 
    453 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
    454   OS << "\t.def\t " << *Symbol << ';';
    455   EmitEOL();
    456 }
    457 
    458 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
    459   OS << "\t.scl\t" << StorageClass << ';';
    460   EmitEOL();
    461 }
    462 
    463 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
    464   OS << "\t.type\t" << Type << ';';
    465   EmitEOL();
    466 }
    467 
    468 void MCAsmStreamer::EndCOFFSymbolDef() {
    469   OS << "\t.endef";
    470   EmitEOL();
    471 }
    472 
    473 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
    474   assert(MAI.hasDotTypeDotSizeDirective());
    475   OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
    476 }
    477 
    478 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    479                                      unsigned ByteAlignment) {
    480   OS << "\t.comm\t" << *Symbol << ',' << Size;
    481   if (ByteAlignment != 0) {
    482     if (MAI.getCOMMDirectiveAlignmentIsInBytes())
    483       OS << ',' << ByteAlignment;
    484     else
    485       OS << ',' << Log2_32(ByteAlignment);
    486   }
    487   EmitEOL();
    488 }
    489 
    490 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
    491 ///
    492 /// @param Symbol - The common symbol to emit.
    493 /// @param Size - The size of the common symbol.
    494 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    495                                           unsigned ByteAlign) {
    496   assert(MAI.getLCOMMDirectiveType() != LCOMM::None &&
    497          "Doesn't have .lcomm, can't emit it!");
    498   OS << "\t.lcomm\t" << *Symbol << ',' << Size;
    499   if (ByteAlign > 1) {
    500     assert(MAI.getLCOMMDirectiveType() == LCOMM::ByteAlignment &&
    501            "Alignment not supported on .lcomm!");
    502     OS << ',' << ByteAlign;
    503   }
    504   EmitEOL();
    505 }
    506 
    507 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
    508                                  unsigned Size, unsigned ByteAlignment) {
    509   // Note: a .zerofill directive does not switch sections.
    510   OS << ".zerofill ";
    511 
    512   // This is a mach-o specific directive.
    513   const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
    514   OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
    515 
    516   if (Symbol != NULL) {
    517     OS << ',' << *Symbol << ',' << Size;
    518     if (ByteAlignment != 0)
    519       OS << ',' << Log2_32(ByteAlignment);
    520   }
    521   EmitEOL();
    522 }
    523 
    524 // .tbss sym, size, align
    525 // This depends that the symbol has already been mangled from the original,
    526 // e.g. _a.
    527 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
    528                                    uint64_t Size, unsigned ByteAlignment) {
    529   assert(Symbol != NULL && "Symbol shouldn't be NULL!");
    530   // Instead of using the Section we'll just use the shortcut.
    531   // This is a mach-o specific directive and section.
    532   OS << ".tbss " << *Symbol << ", " << Size;
    533 
    534   // Output align if we have it.  We default to 1 so don't bother printing
    535   // that.
    536   if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
    537 
    538   EmitEOL();
    539 }
    540 
    541 static inline char toOctal(int X) { return (X&7)+'0'; }
    542 
    543 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
    544   OS << '"';
    545 
    546   for (unsigned i = 0, e = Data.size(); i != e; ++i) {
    547     unsigned char C = Data[i];
    548     if (C == '"' || C == '\\') {
    549       OS << '\\' << (char)C;
    550       continue;
    551     }
    552 
    553     if (isprint((unsigned char)C)) {
    554       OS << (char)C;
    555       continue;
    556     }
    557 
    558     switch (C) {
    559       case '\b': OS << "\\b"; break;
    560       case '\f': OS << "\\f"; break;
    561       case '\n': OS << "\\n"; break;
    562       case '\r': OS << "\\r"; break;
    563       case '\t': OS << "\\t"; break;
    564       default:
    565         OS << '\\';
    566         OS << toOctal(C >> 6);
    567         OS << toOctal(C >> 3);
    568         OS << toOctal(C >> 0);
    569         break;
    570     }
    571   }
    572 
    573   OS << '"';
    574 }
    575 
    576 
    577 void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
    578   assert(getCurrentSection() && "Cannot emit contents before setting section!");
    579   if (Data.empty()) return;
    580 
    581   if (Data.size() == 1) {
    582     OS << MAI.getData8bitsDirective(AddrSpace);
    583     OS << (unsigned)(unsigned char)Data[0];
    584     EmitEOL();
    585     return;
    586   }
    587 
    588   // If the data ends with 0 and the target supports .asciz, use it, otherwise
    589   // use .ascii
    590   if (MAI.getAscizDirective() && Data.back() == 0) {
    591     OS << MAI.getAscizDirective();
    592     Data = Data.substr(0, Data.size()-1);
    593   } else {
    594     OS << MAI.getAsciiDirective();
    595   }
    596 
    597   OS << ' ';
    598   PrintQuotedString(Data, OS);
    599   EmitEOL();
    600 }
    601 
    602 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
    603                                  unsigned AddrSpace) {
    604   EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
    605 }
    606 
    607 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
    608                                   unsigned AddrSpace) {
    609   assert(getCurrentSection() && "Cannot emit contents before setting section!");
    610   const char *Directive = 0;
    611   switch (Size) {
    612   default: break;
    613   case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
    614   case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
    615   case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
    616   case 8:
    617     Directive = MAI.getData64bitsDirective(AddrSpace);
    618     // If the target doesn't support 64-bit data, emit as two 32-bit halves.
    619     if (Directive) break;
    620     int64_t IntValue;
    621     if (!Value->EvaluateAsAbsolute(IntValue))
    622       report_fatal_error("Don't know how to emit this value.");
    623     if (getContext().getAsmInfo().isLittleEndian()) {
    624       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
    625       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
    626     } else {
    627       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
    628       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
    629     }
    630     return;
    631   }
    632 
    633   assert(Directive && "Invalid size for machine code value!");
    634   OS << Directive << *Value;
    635   EmitEOL();
    636 }
    637 
    638 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
    639   int64_t IntValue;
    640   if (Value->EvaluateAsAbsolute(IntValue)) {
    641     EmitULEB128IntValue(IntValue);
    642     return;
    643   }
    644   assert(MAI.hasLEB128() && "Cannot print a .uleb");
    645   OS << ".uleb128 " << *Value;
    646   EmitEOL();
    647 }
    648 
    649 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
    650   int64_t IntValue;
    651   if (Value->EvaluateAsAbsolute(IntValue)) {
    652     EmitSLEB128IntValue(IntValue);
    653     return;
    654   }
    655   assert(MAI.hasLEB128() && "Cannot print a .sleb");
    656   OS << ".sleb128 " << *Value;
    657   EmitEOL();
    658 }
    659 
    660 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
    661   assert(MAI.getGPRel32Directive() != 0);
    662   OS << MAI.getGPRel32Directive() << *Value;
    663   EmitEOL();
    664 }
    665 
    666 
    667 /// EmitFill - Emit NumBytes bytes worth of the value specified by
    668 /// FillValue.  This implements directives such as '.space'.
    669 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
    670                              unsigned AddrSpace) {
    671   if (NumBytes == 0) return;
    672 
    673   if (AddrSpace == 0)
    674     if (const char *ZeroDirective = MAI.getZeroDirective()) {
    675       OS << ZeroDirective << NumBytes;
    676       if (FillValue != 0)
    677         OS << ',' << (int)FillValue;
    678       EmitEOL();
    679       return;
    680     }
    681 
    682   // Emit a byte at a time.
    683   MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
    684 }
    685 
    686 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
    687                                          unsigned ValueSize,
    688                                          unsigned MaxBytesToEmit) {
    689   // Some assemblers don't support non-power of two alignments, so we always
    690   // emit alignments as a power of two if possible.
    691   if (isPowerOf2_32(ByteAlignment)) {
    692     switch (ValueSize) {
    693     default: llvm_unreachable("Invalid size for machine code value!");
    694     case 1: OS << MAI.getAlignDirective(); break;
    695     // FIXME: use MAI for this!
    696     case 2: OS << ".p2alignw "; break;
    697     case 4: OS << ".p2alignl "; break;
    698     case 8: llvm_unreachable("Unsupported alignment size!");
    699     }
    700 
    701     if (MAI.getAlignmentIsInBytes())
    702       OS << ByteAlignment;
    703     else
    704       OS << Log2_32(ByteAlignment);
    705 
    706     if (Value || MaxBytesToEmit) {
    707       OS << ", 0x";
    708       OS.write_hex(truncateToSize(Value, ValueSize));
    709 
    710       if (MaxBytesToEmit)
    711         OS << ", " << MaxBytesToEmit;
    712     }
    713     EmitEOL();
    714     return;
    715   }
    716 
    717   // Non-power of two alignment.  This is not widely supported by assemblers.
    718   // FIXME: Parameterize this based on MAI.
    719   switch (ValueSize) {
    720   default: llvm_unreachable("Invalid size for machine code value!");
    721   case 1: OS << ".balign";  break;
    722   case 2: OS << ".balignw"; break;
    723   case 4: OS << ".balignl"; break;
    724   case 8: llvm_unreachable("Unsupported alignment size!");
    725   }
    726 
    727   OS << ' ' << ByteAlignment;
    728   OS << ", " << truncateToSize(Value, ValueSize);
    729   if (MaxBytesToEmit)
    730     OS << ", " << MaxBytesToEmit;
    731   EmitEOL();
    732 }
    733 
    734 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
    735                                       unsigned MaxBytesToEmit) {
    736   // Emit with a text fill value.
    737   EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
    738                        1, MaxBytesToEmit);
    739 }
    740 
    741 void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
    742                                       unsigned char Value) {
    743   // FIXME: Verify that Offset is associated with the current section.
    744   OS << ".org " << *Offset << ", " << (unsigned) Value;
    745   EmitEOL();
    746 }
    747 
    748 
    749 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
    750   assert(MAI.hasSingleParameterDotFile());
    751   OS << "\t.file\t";
    752   PrintQuotedString(Filename, OS);
    753   EmitEOL();
    754 }
    755 
    756 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
    757                                            StringRef Filename) {
    758   if (!UseDwarfDirectory && !Directory.empty()) {
    759     if (sys::path::is_absolute(Filename))
    760       return EmitDwarfFileDirective(FileNo, "", Filename);
    761 
    762     SmallString<128> FullPathName = Directory;
    763     sys::path::append(FullPathName, Filename);
    764     return EmitDwarfFileDirective(FileNo, "", FullPathName);
    765   }
    766 
    767   if (UseLoc) {
    768     OS << "\t.file\t" << FileNo << ' ';
    769     if (!Directory.empty()) {
    770       PrintQuotedString(Directory, OS);
    771       OS << ' ';
    772     }
    773     PrintQuotedString(Filename, OS);
    774     EmitEOL();
    775   }
    776   return this->MCStreamer::EmitDwarfFileDirective(FileNo, Directory, Filename);
    777 }
    778 
    779 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    780                                           unsigned Column, unsigned Flags,
    781                                           unsigned Isa,
    782                                           unsigned Discriminator,
    783                                           StringRef FileName) {
    784   this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
    785                                           Isa, Discriminator, FileName);
    786   if (!UseLoc)
    787     return;
    788 
    789   OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
    790   if (Flags & DWARF2_FLAG_BASIC_BLOCK)
    791     OS << " basic_block";
    792   if (Flags & DWARF2_FLAG_PROLOGUE_END)
    793     OS << " prologue_end";
    794   if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
    795     OS << " epilogue_begin";
    796 
    797   unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
    798   if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
    799     OS << " is_stmt ";
    800 
    801     if (Flags & DWARF2_FLAG_IS_STMT)
    802       OS << "1";
    803     else
    804       OS << "0";
    805   }
    806 
    807   if (Isa)
    808     OS << "isa " << Isa;
    809   if (Discriminator)
    810     OS << "discriminator " << Discriminator;
    811 
    812   if (IsVerboseAsm) {
    813     OS.PadToColumn(MAI.getCommentColumn());
    814     OS << MAI.getCommentString() << ' ' << FileName << ':'
    815        << Line << ':' << Column;
    816   }
    817   EmitEOL();
    818 }
    819 
    820 void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
    821   MCStreamer::EmitCFISections(EH, Debug);
    822 
    823   if (!UseCFI)
    824     return;
    825 
    826   OS << "\t.cfi_sections ";
    827   if (EH) {
    828     OS << ".eh_frame";
    829     if (Debug)
    830       OS << ", .debug_frame";
    831   } else if (Debug) {
    832     OS << ".debug_frame";
    833   }
    834 
    835   EmitEOL();
    836 }
    837 
    838 void MCAsmStreamer::EmitCFIStartProc() {
    839   MCStreamer::EmitCFIStartProc();
    840 
    841   if (!UseCFI)
    842     return;
    843 
    844   OS << "\t.cfi_startproc";
    845   EmitEOL();
    846 }
    847 
    848 void MCAsmStreamer::EmitCFIEndProc() {
    849   MCStreamer::EmitCFIEndProc();
    850 
    851   if (!UseCFI)
    852     return;
    853 
    854   OS << "\t.cfi_endproc";
    855   EmitEOL();
    856 }
    857 
    858 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
    859   if (InstPrinter && !MAI.useDwarfRegNumForCFI()) {
    860     const MCRegisterInfo &MRI = getContext().getRegisterInfo();
    861     unsigned LLVMRegister = MRI.getLLVMRegNum(Register, true);
    862     InstPrinter->printRegName(OS, LLVMRegister);
    863   } else {
    864     OS << Register;
    865   }
    866 }
    867 
    868 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
    869   MCStreamer::EmitCFIDefCfa(Register, Offset);
    870 
    871   if (!UseCFI)
    872     return;
    873 
    874   OS << "\t.cfi_def_cfa ";
    875   EmitRegisterName(Register);
    876   OS << ", " << Offset;
    877   EmitEOL();
    878 }
    879 
    880 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
    881   MCStreamer::EmitCFIDefCfaOffset(Offset);
    882 
    883   if (!UseCFI)
    884     return;
    885 
    886   OS << "\t.cfi_def_cfa_offset " << Offset;
    887   EmitEOL();
    888 }
    889 
    890 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
    891   MCStreamer::EmitCFIDefCfaRegister(Register);
    892 
    893   if (!UseCFI)
    894     return;
    895 
    896   OS << "\t.cfi_def_cfa_register ";
    897   EmitRegisterName(Register);
    898   EmitEOL();
    899 }
    900 
    901 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
    902   this->MCStreamer::EmitCFIOffset(Register, Offset);
    903 
    904   if (!UseCFI)
    905     return;
    906 
    907   OS << "\t.cfi_offset ";
    908   EmitRegisterName(Register);
    909   OS << ", " << Offset;
    910   EmitEOL();
    911 }
    912 
    913 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
    914                                        unsigned Encoding) {
    915   MCStreamer::EmitCFIPersonality(Sym, Encoding);
    916 
    917   if (!UseCFI)
    918     return;
    919 
    920   OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
    921   EmitEOL();
    922 }
    923 
    924 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
    925   MCStreamer::EmitCFILsda(Sym, Encoding);
    926 
    927   if (!UseCFI)
    928     return;
    929 
    930   OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
    931   EmitEOL();
    932 }
    933 
    934 void MCAsmStreamer::EmitCFIRememberState() {
    935   MCStreamer::EmitCFIRememberState();
    936 
    937   if (!UseCFI)
    938     return;
    939 
    940   OS << "\t.cfi_remember_state";
    941   EmitEOL();
    942 }
    943 
    944 void MCAsmStreamer::EmitCFIRestoreState() {
    945   MCStreamer::EmitCFIRestoreState();
    946 
    947   if (!UseCFI)
    948     return;
    949 
    950   OS << "\t.cfi_restore_state";
    951   EmitEOL();
    952 }
    953 
    954 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
    955   MCStreamer::EmitCFISameValue(Register);
    956 
    957   if (!UseCFI)
    958     return;
    959 
    960   OS << "\t.cfi_same_value ";
    961   EmitRegisterName(Register);
    962   EmitEOL();
    963 }
    964 
    965 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
    966   MCStreamer::EmitCFIRelOffset(Register, Offset);
    967 
    968   if (!UseCFI)
    969     return;
    970 
    971   OS << "\t.cfi_rel_offset ";
    972   EmitRegisterName(Register);
    973   OS << ", " << Offset;
    974   EmitEOL();
    975 }
    976 
    977 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
    978   MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
    979 
    980   if (!UseCFI)
    981     return;
    982 
    983   OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
    984   EmitEOL();
    985 }
    986 
    987 void MCAsmStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
    988   MCStreamer::EmitWin64EHStartProc(Symbol);
    989 
    990   OS << ".seh_proc " << *Symbol;
    991   EmitEOL();
    992 }
    993 
    994 void MCAsmStreamer::EmitWin64EHEndProc() {
    995   MCStreamer::EmitWin64EHEndProc();
    996 
    997   OS << "\t.seh_endproc";
    998   EmitEOL();
    999 }
   1000 
   1001 void MCAsmStreamer::EmitWin64EHStartChained() {
   1002   MCStreamer::EmitWin64EHStartChained();
   1003 
   1004   OS << "\t.seh_startchained";
   1005   EmitEOL();
   1006 }
   1007 
   1008 void MCAsmStreamer::EmitWin64EHEndChained() {
   1009   MCStreamer::EmitWin64EHEndChained();
   1010 
   1011   OS << "\t.seh_endchained";
   1012   EmitEOL();
   1013 }
   1014 
   1015 void MCAsmStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
   1016                                        bool Except) {
   1017   MCStreamer::EmitWin64EHHandler(Sym, Unwind, Except);
   1018 
   1019   OS << "\t.seh_handler " << *Sym;
   1020   if (Unwind)
   1021     OS << ", @unwind";
   1022   if (Except)
   1023     OS << ", @except";
   1024   EmitEOL();
   1025 }
   1026 
   1027 static const MCSection *getWin64EHTableSection(StringRef suffix,
   1028                                                MCContext &context) {
   1029   // FIXME: This doesn't belong in MCObjectFileInfo. However,
   1030   /// this duplicate code in MCWin64EH.cpp.
   1031   if (suffix == "")
   1032     return context.getObjectFileInfo()->getXDataSection();
   1033   return context.getCOFFSection((".xdata"+suffix).str(),
   1034                                 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
   1035                                 COFF::IMAGE_SCN_MEM_READ |
   1036                                 COFF::IMAGE_SCN_MEM_WRITE,
   1037                                 SectionKind::getDataRel());
   1038 }
   1039 
   1040 void MCAsmStreamer::EmitWin64EHHandlerData() {
   1041   MCStreamer::EmitWin64EHHandlerData();
   1042 
   1043   // Switch sections. Don't call SwitchSection directly, because that will
   1044   // cause the section switch to be visible in the emitted assembly.
   1045   // We only do this so the section switch that terminates the handler
   1046   // data block is visible.
   1047   MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
   1048   StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
   1049   const MCSection *xdataSect = getWin64EHTableSection(suffix, getContext());
   1050   if (xdataSect)
   1051     SwitchSectionNoChange(xdataSect);
   1052 
   1053   OS << "\t.seh_handlerdata";
   1054   EmitEOL();
   1055 }
   1056 
   1057 void MCAsmStreamer::EmitWin64EHPushReg(unsigned Register) {
   1058   MCStreamer::EmitWin64EHPushReg(Register);
   1059 
   1060   OS << "\t.seh_pushreg " << Register;
   1061   EmitEOL();
   1062 }
   1063 
   1064 void MCAsmStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
   1065   MCStreamer::EmitWin64EHSetFrame(Register, Offset);
   1066 
   1067   OS << "\t.seh_setframe " << Register << ", " << Offset;
   1068   EmitEOL();
   1069 }
   1070 
   1071 void MCAsmStreamer::EmitWin64EHAllocStack(unsigned Size) {
   1072   MCStreamer::EmitWin64EHAllocStack(Size);
   1073 
   1074   OS << "\t.seh_stackalloc " << Size;
   1075   EmitEOL();
   1076 }
   1077 
   1078 void MCAsmStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
   1079   MCStreamer::EmitWin64EHSaveReg(Register, Offset);
   1080 
   1081   OS << "\t.seh_savereg " << Register << ", " << Offset;
   1082   EmitEOL();
   1083 }
   1084 
   1085 void MCAsmStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
   1086   MCStreamer::EmitWin64EHSaveXMM(Register, Offset);
   1087 
   1088   OS << "\t.seh_savexmm " << Register << ", " << Offset;
   1089   EmitEOL();
   1090 }
   1091 
   1092 void MCAsmStreamer::EmitWin64EHPushFrame(bool Code) {
   1093   MCStreamer::EmitWin64EHPushFrame(Code);
   1094 
   1095   OS << "\t.seh_pushframe";
   1096   if (Code)
   1097     OS << " @code";
   1098   EmitEOL();
   1099 }
   1100 
   1101 void MCAsmStreamer::EmitWin64EHEndProlog(void) {
   1102   MCStreamer::EmitWin64EHEndProlog();
   1103 
   1104   OS << "\t.seh_endprologue";
   1105   EmitEOL();
   1106 }
   1107 
   1108 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
   1109   raw_ostream &OS = GetCommentOS();
   1110   SmallString<256> Code;
   1111   SmallVector<MCFixup, 4> Fixups;
   1112   raw_svector_ostream VecOS(Code);
   1113   Emitter->EncodeInstruction(Inst, VecOS, Fixups);
   1114   VecOS.flush();
   1115 
   1116   // If we are showing fixups, create symbolic markers in the encoded
   1117   // representation. We do this by making a per-bit map to the fixup item index,
   1118   // then trying to display it as nicely as possible.
   1119   SmallVector<uint8_t, 64> FixupMap;
   1120   FixupMap.resize(Code.size() * 8);
   1121   for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
   1122     FixupMap[i] = 0;
   1123 
   1124   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
   1125     MCFixup &F = Fixups[i];
   1126     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
   1127     for (unsigned j = 0; j != Info.TargetSize; ++j) {
   1128       unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
   1129       assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
   1130       FixupMap[Index] = 1 + i;
   1131     }
   1132   }
   1133 
   1134   // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
   1135   // high order halfword of a 32-bit Thumb2 instruction is emitted first.
   1136   OS << "encoding: [";
   1137   for (unsigned i = 0, e = Code.size(); i != e; ++i) {
   1138     if (i)
   1139       OS << ',';
   1140 
   1141     // See if all bits are the same map entry.
   1142     uint8_t MapEntry = FixupMap[i * 8 + 0];
   1143     for (unsigned j = 1; j != 8; ++j) {
   1144       if (FixupMap[i * 8 + j] == MapEntry)
   1145         continue;
   1146 
   1147       MapEntry = uint8_t(~0U);
   1148       break;
   1149     }
   1150 
   1151     if (MapEntry != uint8_t(~0U)) {
   1152       if (MapEntry == 0) {
   1153         OS << format("0x%02x", uint8_t(Code[i]));
   1154       } else {
   1155         if (Code[i]) {
   1156           // FIXME: Some of the 8 bits require fix up.
   1157           OS << format("0x%02x", uint8_t(Code[i])) << '\''
   1158              << char('A' + MapEntry - 1) << '\'';
   1159         } else
   1160           OS << char('A' + MapEntry - 1);
   1161       }
   1162     } else {
   1163       // Otherwise, write out in binary.
   1164       OS << "0b";
   1165       for (unsigned j = 8; j--;) {
   1166         unsigned Bit = (Code[i] >> j) & 1;
   1167 
   1168         unsigned FixupBit;
   1169         if (getContext().getAsmInfo().isLittleEndian())
   1170           FixupBit = i * 8 + j;
   1171         else
   1172           FixupBit = i * 8 + (7-j);
   1173 
   1174         if (uint8_t MapEntry = FixupMap[FixupBit]) {
   1175           assert(Bit == 0 && "Encoder wrote into fixed up bit!");
   1176           OS << char('A' + MapEntry - 1);
   1177         } else
   1178           OS << Bit;
   1179       }
   1180     }
   1181   }
   1182   OS << "]\n";
   1183 
   1184   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
   1185     MCFixup &F = Fixups[i];
   1186     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
   1187     OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
   1188        << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
   1189   }
   1190 }
   1191 
   1192 void MCAsmStreamer::EmitFnStart() {
   1193   OS << "\t.fnstart";
   1194   EmitEOL();
   1195 }
   1196 
   1197 void MCAsmStreamer::EmitFnEnd() {
   1198   OS << "\t.fnend";
   1199   EmitEOL();
   1200 }
   1201 
   1202 void MCAsmStreamer::EmitCantUnwind() {
   1203   OS << "\t.cantunwind";
   1204   EmitEOL();
   1205 }
   1206 
   1207 void MCAsmStreamer::EmitHandlerData() {
   1208   OS << "\t.handlerdata";
   1209   EmitEOL();
   1210 }
   1211 
   1212 void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
   1213   OS << "\t.personality " << Personality->getName();
   1214   EmitEOL();
   1215 }
   1216 
   1217 void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
   1218   OS << "\t.setfp\t";
   1219   InstPrinter->printRegName(OS, FpReg);
   1220   OS << ", ";
   1221   InstPrinter->printRegName(OS, SpReg);
   1222   if (Offset)
   1223     OS << ", #" << Offset;
   1224   EmitEOL();
   1225 }
   1226 
   1227 void MCAsmStreamer::EmitPad(int64_t Offset) {
   1228   OS << "\t.pad\t#" << Offset;
   1229   EmitEOL();
   1230 }
   1231 
   1232 void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
   1233                                 bool isVector) {
   1234   assert(RegList.size() && "RegList should not be empty");
   1235   if (isVector)
   1236     OS << "\t.vsave\t{";
   1237   else
   1238     OS << "\t.save\t{";
   1239 
   1240   InstPrinter->printRegName(OS, RegList[0]);
   1241 
   1242   for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
   1243     OS << ", ";
   1244     InstPrinter->printRegName(OS, RegList[i]);
   1245   }
   1246 
   1247   OS << "}";
   1248   EmitEOL();
   1249 }
   1250 
   1251 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
   1252   assert(getCurrentSection() && "Cannot emit contents before setting section!");
   1253 
   1254   // Show the encoding in a comment if we have a code emitter.
   1255   if (Emitter)
   1256     AddEncodingComment(Inst);
   1257 
   1258   // Show the MCInst if enabled.
   1259   if (ShowInst) {
   1260     Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
   1261     GetCommentOS() << "\n";
   1262   }
   1263 
   1264   // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
   1265   if (InstPrinter)
   1266     InstPrinter->printInst(&Inst, OS, "");
   1267   else
   1268     Inst.print(OS, &MAI);
   1269   EmitEOL();
   1270 }
   1271 
   1272 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
   1273 /// the specified string in the output .s file.  This capability is
   1274 /// indicated by the hasRawTextSupport() predicate.
   1275 void MCAsmStreamer::EmitRawText(StringRef String) {
   1276   if (!String.empty() && String.back() == '\n')
   1277     String = String.substr(0, String.size()-1);
   1278   OS << String;
   1279   EmitEOL();
   1280 }
   1281 
   1282 void MCAsmStreamer::Finish() {
   1283   // Dump out the dwarf file & directory tables and line tables.
   1284   if (getContext().hasDwarfFiles() && !UseLoc)
   1285     MCDwarfFileTable::Emit(this);
   1286 
   1287   if (!UseCFI)
   1288     EmitFrames(false);
   1289 }
   1290 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
   1291                                     formatted_raw_ostream &OS,
   1292                                     bool isVerboseAsm, bool useLoc,
   1293                                     bool useCFI, bool useDwarfDirectory,
   1294                                     MCInstPrinter *IP, MCCodeEmitter *CE,
   1295                                     MCAsmBackend *MAB, bool ShowInst) {
   1296   return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc, useCFI,
   1297                            useDwarfDirectory, IP, CE, MAB, ShowInst);
   1298 }
   1299