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      1 //===- lib/MC/MCAsmStreamer.cpp - Text Assembly Output ----------*- C++ -*-===//
      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/ADT/STLExtras.h"
     12 #include "llvm/ADT/SmallString.h"
     13 #include "llvm/ADT/StringExtras.h"
     14 #include "llvm/ADT/Twine.h"
     15 #include "llvm/MC/MCAsmBackend.h"
     16 #include "llvm/MC/MCAsmInfo.h"
     17 #include "llvm/MC/MCCodeEmitter.h"
     18 #include "llvm/MC/MCContext.h"
     19 #include "llvm/MC/MCExpr.h"
     20 #include "llvm/MC/MCFixupKindInfo.h"
     21 #include "llvm/MC/MCInst.h"
     22 #include "llvm/MC/MCInstPrinter.h"
     23 #include "llvm/MC/MCObjectFileInfo.h"
     24 #include "llvm/MC/MCRegisterInfo.h"
     25 #include "llvm/MC/MCSectionCOFF.h"
     26 #include "llvm/MC/MCSectionMachO.h"
     27 #include "llvm/MC/MCSymbolELF.h"
     28 #include "llvm/Support/CommandLine.h"
     29 #include "llvm/Support/ErrorHandling.h"
     30 #include "llvm/Support/Format.h"
     31 #include "llvm/Support/FormattedStream.h"
     32 #include "llvm/Support/LEB128.h"
     33 #include "llvm/Support/MathExtras.h"
     34 #include "llvm/Support/Path.h"
     35 #include <cctype>
     36 
     37 using namespace llvm;
     38 
     39 namespace {
     40 
     41 class MCAsmStreamer final : public MCStreamer {
     42   std::unique_ptr<formatted_raw_ostream> OSOwner;
     43   formatted_raw_ostream &OS;
     44   const MCAsmInfo *MAI;
     45   std::unique_ptr<MCInstPrinter> InstPrinter;
     46   std::unique_ptr<MCCodeEmitter> Emitter;
     47   std::unique_ptr<MCAsmBackend> AsmBackend;
     48 
     49   SmallString<128> CommentToEmit;
     50   raw_svector_ostream CommentStream;
     51 
     52   unsigned IsVerboseAsm : 1;
     53   unsigned ShowInst : 1;
     54   unsigned UseDwarfDirectory : 1;
     55 
     56   void EmitRegisterName(int64_t Register);
     57   void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) override;
     58   void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override;
     59 
     60 public:
     61   MCAsmStreamer(MCContext &Context, std::unique_ptr<formatted_raw_ostream> os,
     62                 bool isVerboseAsm, bool useDwarfDirectory,
     63                 MCInstPrinter *printer, MCCodeEmitter *emitter,
     64                 MCAsmBackend *asmbackend, bool showInst)
     65       : MCStreamer(Context), OSOwner(std::move(os)), OS(*OSOwner),
     66         MAI(Context.getAsmInfo()), InstPrinter(printer), Emitter(emitter),
     67         AsmBackend(asmbackend), CommentStream(CommentToEmit),
     68         IsVerboseAsm(isVerboseAsm), ShowInst(showInst),
     69         UseDwarfDirectory(useDwarfDirectory) {
     70     assert(InstPrinter);
     71     if (IsVerboseAsm)
     72         InstPrinter->setCommentStream(CommentStream);
     73   }
     74 
     75   inline void EmitEOL() {
     76     // If we don't have any comments, just emit a \n.
     77     if (!IsVerboseAsm) {
     78       OS << '\n';
     79       return;
     80     }
     81     EmitCommentsAndEOL();
     82   }
     83 
     84   void EmitSyntaxDirective() override;
     85 
     86   void EmitCommentsAndEOL();
     87 
     88   /// isVerboseAsm - Return true if this streamer supports verbose assembly at
     89   /// all.
     90   bool isVerboseAsm() const override { return IsVerboseAsm; }
     91 
     92   /// hasRawTextSupport - We support EmitRawText.
     93   bool hasRawTextSupport() const override { 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   void AddComment(const Twine &T) override;
    100 
    101   /// AddEncodingComment - Add a comment showing the encoding of an instruction.
    102   void AddEncodingComment(const MCInst &Inst, const MCSubtargetInfo &);
    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   raw_ostream &GetCommentOS() override {
    108     if (!IsVerboseAsm)
    109       return nulls();  // Discard comments unless in verbose asm mode.
    110     return CommentStream;
    111   }
    112 
    113   void emitRawComment(const Twine &T, bool TabPrefix = true) override;
    114 
    115   /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
    116   void AddBlankLine() override {
    117     EmitEOL();
    118   }
    119 
    120   /// @name MCStreamer Interface
    121   /// @{
    122 
    123   void ChangeSection(MCSection *Section, const MCExpr *Subsection) override;
    124 
    125   void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override;
    126   void EmitLabel(MCSymbol *Symbol) override;
    127 
    128   void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
    129   void EmitLinkerOptions(ArrayRef<std::string> Options) override;
    130   void EmitDataRegion(MCDataRegionType Kind) override;
    131   void EmitVersionMin(MCVersionMinType Kind, unsigned Major, unsigned Minor,
    132                       unsigned Update) override;
    133   void EmitThumbFunc(MCSymbol *Func) override;
    134 
    135   void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
    136   void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
    137   bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
    138 
    139   void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
    140   void BeginCOFFSymbolDef(const MCSymbol *Symbol) override;
    141   void EmitCOFFSymbolStorageClass(int StorageClass) override;
    142   void EmitCOFFSymbolType(int Type) override;
    143   void EndCOFFSymbolDef() override;
    144   void EmitCOFFSafeSEH(MCSymbol const *Symbol) override;
    145   void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
    146   void EmitCOFFSecRel32(MCSymbol const *Symbol) override;
    147   void emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value) override;
    148   void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    149                         unsigned ByteAlignment) override;
    150 
    151   /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
    152   ///
    153   /// @param Symbol - The common symbol to emit.
    154   /// @param Size - The size of the common symbol.
    155   /// @param ByteAlignment - The alignment of the common symbol in bytes.
    156   void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    157                              unsigned ByteAlignment) override;
    158 
    159   void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
    160                     uint64_t Size = 0, unsigned ByteAlignment = 0) override;
    161 
    162   void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
    163                       unsigned ByteAlignment = 0) override;
    164 
    165   void EmitBytes(StringRef Data) override;
    166 
    167   void EmitValueImpl(const MCExpr *Value, unsigned Size,
    168                      SMLoc Loc = SMLoc()) override;
    169   void EmitIntValue(uint64_t Value, unsigned Size) override;
    170 
    171   void EmitULEB128Value(const MCExpr *Value) override;
    172 
    173   void EmitSLEB128Value(const MCExpr *Value) override;
    174 
    175   void EmitGPRel64Value(const MCExpr *Value) override;
    176 
    177   void EmitGPRel32Value(const MCExpr *Value) override;
    178 
    179 
    180   void EmitFill(uint64_t NumBytes, uint8_t FillValue) override;
    181 
    182   void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
    183                             unsigned ValueSize = 1,
    184                             unsigned MaxBytesToEmit = 0) override;
    185 
    186   void EmitCodeAlignment(unsigned ByteAlignment,
    187                          unsigned MaxBytesToEmit = 0) override;
    188 
    189   void emitValueToOffset(const MCExpr *Offset,
    190                          unsigned char Value = 0) override;
    191 
    192   void EmitFileDirective(StringRef Filename) override;
    193   unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
    194                                   StringRef Filename,
    195                                   unsigned CUID = 0) override;
    196   void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    197                              unsigned Column, unsigned Flags,
    198                              unsigned Isa, unsigned Discriminator,
    199                              StringRef FileName) override;
    200   MCSymbol *getDwarfLineTableSymbol(unsigned CUID) override;
    201 
    202   void EmitIdent(StringRef IdentString) override;
    203   void EmitCFISections(bool EH, bool Debug) override;
    204   void EmitCFIDefCfa(int64_t Register, int64_t Offset) override;
    205   void EmitCFIDefCfaOffset(int64_t Offset) override;
    206   void EmitCFIDefCfaRegister(int64_t Register) override;
    207   void EmitCFIOffset(int64_t Register, int64_t Offset) override;
    208   void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding) override;
    209   void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) override;
    210   void EmitCFIRememberState() override;
    211   void EmitCFIRestoreState() override;
    212   void EmitCFISameValue(int64_t Register) override;
    213   void EmitCFIRelOffset(int64_t Register, int64_t Offset) override;
    214   void EmitCFIAdjustCfaOffset(int64_t Adjustment) override;
    215   void EmitCFIEscape(StringRef Values) override;
    216   void EmitCFIGnuArgsSize(int64_t Size) override;
    217   void EmitCFISignalFrame() override;
    218   void EmitCFIUndefined(int64_t Register) override;
    219   void EmitCFIRegister(int64_t Register1, int64_t Register2) override;
    220   void EmitCFIWindowSave() override;
    221 
    222   void EmitWinCFIStartProc(const MCSymbol *Symbol) override;
    223   void EmitWinCFIEndProc() override;
    224   void EmitWinCFIStartChained() override;
    225   void EmitWinCFIEndChained() override;
    226   void EmitWinCFIPushReg(unsigned Register) override;
    227   void EmitWinCFISetFrame(unsigned Register, unsigned Offset) override;
    228   void EmitWinCFIAllocStack(unsigned Size) override;
    229   void EmitWinCFISaveReg(unsigned Register, unsigned Offset) override;
    230   void EmitWinCFISaveXMM(unsigned Register, unsigned Offset) override;
    231   void EmitWinCFIPushFrame(bool Code) override;
    232   void EmitWinCFIEndProlog() override;
    233 
    234   void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except) override;
    235   void EmitWinEHHandlerData() override;
    236 
    237   void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
    238 
    239   void EmitBundleAlignMode(unsigned AlignPow2) override;
    240   void EmitBundleLock(bool AlignToEnd) override;
    241   void EmitBundleUnlock() override;
    242 
    243   bool EmitRelocDirective(const MCExpr &Offset, StringRef Name,
    244                           const MCExpr *Expr, SMLoc Loc) override;
    245 
    246   /// EmitRawText - If this file is backed by an assembly streamer, this dumps
    247   /// the specified string in the output .s file.  This capability is
    248   /// indicated by the hasRawTextSupport() predicate.
    249   void EmitRawTextImpl(StringRef String) override;
    250 
    251   void FinishImpl() override;
    252 };
    253 
    254 } // end anonymous namespace.
    255 
    256 /// AddComment - Add a comment that can be emitted to the generated .s
    257 /// file if applicable as a QoI issue to make the output of the compiler
    258 /// more readable.  This only affects the MCAsmStreamer, and only when
    259 /// verbose assembly output is enabled.
    260 void MCAsmStreamer::AddComment(const Twine &T) {
    261   if (!IsVerboseAsm) return;
    262 
    263   T.toVector(CommentToEmit);
    264   // Each comment goes on its own line.
    265   CommentToEmit.push_back('\n');
    266 }
    267 
    268 void MCAsmStreamer::EmitCommentsAndEOL() {
    269   if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
    270     OS << '\n';
    271     return;
    272   }
    273 
    274   StringRef Comments = CommentToEmit;
    275 
    276   assert(Comments.back() == '\n' &&
    277          "Comment array not newline terminated");
    278   do {
    279     // Emit a line of comments.
    280     OS.PadToColumn(MAI->getCommentColumn());
    281     size_t Position = Comments.find('\n');
    282     OS << MAI->getCommentString() << ' ' << Comments.substr(0, Position) <<'\n';
    283 
    284     Comments = Comments.substr(Position+1);
    285   } while (!Comments.empty());
    286 
    287   CommentToEmit.clear();
    288 }
    289 
    290 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
    291   assert(Bytes && "Invalid size!");
    292   return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
    293 }
    294 
    295 void MCAsmStreamer::emitRawComment(const Twine &T, bool TabPrefix) {
    296   if (TabPrefix)
    297     OS << '\t';
    298   OS << MAI->getCommentString() << T;
    299   EmitEOL();
    300 }
    301 
    302 void MCAsmStreamer::ChangeSection(MCSection *Section,
    303                                   const MCExpr *Subsection) {
    304   assert(Section && "Cannot switch to a null section!");
    305   Section->PrintSwitchToSection(*MAI, OS, Subsection);
    306 }
    307 
    308 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
    309   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
    310   MCStreamer::EmitLabel(Symbol);
    311 
    312   Symbol->print(OS, MAI);
    313   OS << MAI->getLabelSuffix();
    314 
    315   EmitEOL();
    316 }
    317 
    318 void MCAsmStreamer::EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {
    319   StringRef str = MCLOHIdToName(Kind);
    320 
    321 #ifndef NDEBUG
    322   int NbArgs = MCLOHIdToNbArgs(Kind);
    323   assert(NbArgs != -1 && ((size_t)NbArgs) == Args.size() && "Malformed LOH!");
    324   assert(str != "" && "Invalid LOH name");
    325 #endif
    326 
    327   OS << "\t" << MCLOHDirectiveName() << " " << str << "\t";
    328   bool IsFirst = true;
    329   for (MCLOHArgs::const_iterator It = Args.begin(), EndIt = Args.end();
    330        It != EndIt; ++It) {
    331     if (!IsFirst)
    332       OS << ", ";
    333     IsFirst = false;
    334     (*It)->print(OS, MAI);
    335   }
    336   EmitEOL();
    337 }
    338 
    339 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
    340   switch (Flag) {
    341   case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
    342   case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
    343   case MCAF_Code16:                OS << '\t'<< MAI->getCode16Directive();break;
    344   case MCAF_Code32:                OS << '\t'<< MAI->getCode32Directive();break;
    345   case MCAF_Code64:                OS << '\t'<< MAI->getCode64Directive();break;
    346   }
    347   EmitEOL();
    348 }
    349 
    350 void MCAsmStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
    351   assert(!Options.empty() && "At least one option is required!");
    352   OS << "\t.linker_option \"" << Options[0] << '"';
    353   for (ArrayRef<std::string>::iterator it = Options.begin() + 1,
    354          ie = Options.end(); it != ie; ++it) {
    355     OS << ", " << '"' << *it << '"';
    356   }
    357   OS << "\n";
    358 }
    359 
    360 void MCAsmStreamer::EmitDataRegion(MCDataRegionType Kind) {
    361   if (!MAI->doesSupportDataRegionDirectives())
    362     return;
    363   switch (Kind) {
    364   case MCDR_DataRegion:            OS << "\t.data_region"; break;
    365   case MCDR_DataRegionJT8:         OS << "\t.data_region jt8"; break;
    366   case MCDR_DataRegionJT16:        OS << "\t.data_region jt16"; break;
    367   case MCDR_DataRegionJT32:        OS << "\t.data_region jt32"; break;
    368   case MCDR_DataRegionEnd:         OS << "\t.end_data_region"; break;
    369   }
    370   EmitEOL();
    371 }
    372 
    373 void MCAsmStreamer::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
    374                                    unsigned Minor, unsigned Update) {
    375   switch (Kind) {
    376   case MCVM_WatchOSVersionMin:    OS << "\t.watchos_version_min"; break;
    377   case MCVM_TvOSVersionMin:       OS << "\t.tvos_version_min"; break;
    378   case MCVM_IOSVersionMin:        OS << "\t.ios_version_min"; break;
    379   case MCVM_OSXVersionMin:        OS << "\t.macosx_version_min"; break;
    380   }
    381   OS << " " << Major << ", " << Minor;
    382   if (Update)
    383     OS << ", " << Update;
    384   EmitEOL();
    385 }
    386 
    387 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
    388   // This needs to emit to a temporary string to get properly quoted
    389   // MCSymbols when they have spaces in them.
    390   OS << "\t.thumb_func";
    391   // Only Mach-O hasSubsectionsViaSymbols()
    392   if (MAI->hasSubsectionsViaSymbols()) {
    393     OS << '\t';
    394     Func->print(OS, MAI);
    395   }
    396   EmitEOL();
    397 }
    398 
    399 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
    400   Symbol->print(OS, MAI);
    401   OS << " = ";
    402   Value->print(OS, MAI);
    403 
    404   EmitEOL();
    405 
    406   MCStreamer::EmitAssignment(Symbol, Value);
    407 }
    408 
    409 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
    410   OS << ".weakref ";
    411   Alias->print(OS, MAI);
    412   OS << ", ";
    413   Symbol->print(OS, MAI);
    414   EmitEOL();
    415 }
    416 
    417 bool MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
    418                                         MCSymbolAttr Attribute) {
    419   switch (Attribute) {
    420   case MCSA_Invalid: llvm_unreachable("Invalid symbol attribute");
    421   case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
    422   case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
    423   case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
    424   case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
    425   case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
    426   case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
    427   case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
    428     if (!MAI->hasDotTypeDotSizeDirective())
    429       return false; // Symbol attribute not supported
    430     OS << "\t.type\t";
    431     Symbol->print(OS, MAI);
    432     OS << ',' << ((MAI->getCommentString()[0] != '@') ? '@' : '%');
    433     switch (Attribute) {
    434     default: return false;
    435     case MCSA_ELF_TypeFunction:    OS << "function"; break;
    436     case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
    437     case MCSA_ELF_TypeObject:      OS << "object"; break;
    438     case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
    439     case MCSA_ELF_TypeCommon:      OS << "common"; break;
    440     case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
    441     case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
    442     }
    443     EmitEOL();
    444     return true;
    445   case MCSA_Global: // .globl/.global
    446     OS << MAI->getGlobalDirective();
    447     break;
    448   case MCSA_Hidden:         OS << "\t.hidden\t";          break;
    449   case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
    450   case MCSA_Internal:       OS << "\t.internal\t";        break;
    451   case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
    452   case MCSA_Local:          OS << "\t.local\t";           break;
    453   case MCSA_NoDeadStrip:
    454     if (!MAI->hasNoDeadStrip())
    455       return false;
    456     OS << "\t.no_dead_strip\t";
    457     break;
    458   case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
    459   case MCSA_PrivateExtern:
    460     OS << "\t.private_extern\t";
    461     break;
    462   case MCSA_Protected:      OS << "\t.protected\t";       break;
    463   case MCSA_Reference:      OS << "\t.reference\t";       break;
    464   case MCSA_Weak:           OS << MAI->getWeakDirective(); break;
    465   case MCSA_WeakDefinition:
    466     OS << "\t.weak_definition\t";
    467     break;
    468       // .weak_reference
    469   case MCSA_WeakReference:  OS << MAI->getWeakRefDirective(); break;
    470   case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
    471   }
    472 
    473   Symbol->print(OS, MAI);
    474   EmitEOL();
    475 
    476   return true;
    477 }
    478 
    479 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
    480   OS << ".desc" << ' ';
    481   Symbol->print(OS, MAI);
    482   OS << ',' << DescValue;
    483   EmitEOL();
    484 }
    485 
    486 void MCAsmStreamer::EmitSyntaxDirective() {
    487   if (MAI->getAssemblerDialect() == 1)
    488     OS << "\t.intel_syntax noprefix\n";
    489   // FIXME: Currently emit unprefix'ed registers.
    490   // The intel_syntax directive has one optional argument
    491   // with may have a value of prefix or noprefix.
    492 }
    493 
    494 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
    495   OS << "\t.def\t ";
    496   Symbol->print(OS, MAI);
    497   OS << ';';
    498   EmitEOL();
    499 }
    500 
    501 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
    502   OS << "\t.scl\t" << StorageClass << ';';
    503   EmitEOL();
    504 }
    505 
    506 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
    507   OS << "\t.type\t" << Type << ';';
    508   EmitEOL();
    509 }
    510 
    511 void MCAsmStreamer::EndCOFFSymbolDef() {
    512   OS << "\t.endef";
    513   EmitEOL();
    514 }
    515 
    516 void MCAsmStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
    517   OS << "\t.safeseh\t";
    518   Symbol->print(OS, MAI);
    519   EmitEOL();
    520 }
    521 
    522 void MCAsmStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
    523   OS << "\t.secidx\t";
    524   Symbol->print(OS, MAI);
    525   EmitEOL();
    526 }
    527 
    528 void MCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
    529   OS << "\t.secrel32\t";
    530   Symbol->print(OS, MAI);
    531   EmitEOL();
    532 }
    533 
    534 void MCAsmStreamer::emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value) {
    535   assert(MAI->hasDotTypeDotSizeDirective());
    536   OS << "\t.size\t";
    537   Symbol->print(OS, MAI);
    538   OS << ", ";
    539   Value->print(OS, MAI);
    540   OS << '\n';
    541 }
    542 
    543 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    544                                      unsigned ByteAlignment) {
    545   OS << "\t.comm\t";
    546   Symbol->print(OS, MAI);
    547   OS << ',' << Size;
    548 
    549   if (ByteAlignment != 0) {
    550     if (MAI->getCOMMDirectiveAlignmentIsInBytes())
    551       OS << ',' << ByteAlignment;
    552     else
    553       OS << ',' << Log2_32(ByteAlignment);
    554   }
    555   EmitEOL();
    556 }
    557 
    558 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
    559 ///
    560 /// @param Symbol - The common symbol to emit.
    561 /// @param Size - The size of the common symbol.
    562 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
    563                                           unsigned ByteAlign) {
    564   OS << "\t.lcomm\t";
    565   Symbol->print(OS, MAI);
    566   OS << ',' << Size;
    567 
    568   if (ByteAlign > 1) {
    569     switch (MAI->getLCOMMDirectiveAlignmentType()) {
    570     case LCOMM::NoAlignment:
    571       llvm_unreachable("alignment not supported on .lcomm!");
    572     case LCOMM::ByteAlignment:
    573       OS << ',' << ByteAlign;
    574       break;
    575     case LCOMM::Log2Alignment:
    576       assert(isPowerOf2_32(ByteAlign) && "alignment must be a power of 2");
    577       OS << ',' << Log2_32(ByteAlign);
    578       break;
    579     }
    580   }
    581   EmitEOL();
    582 }
    583 
    584 void MCAsmStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
    585                                  uint64_t Size, unsigned ByteAlignment) {
    586   if (Symbol)
    587     AssignFragment(Symbol, &Section->getDummyFragment());
    588 
    589   // Note: a .zerofill directive does not switch sections.
    590   OS << ".zerofill ";
    591 
    592   // This is a mach-o specific directive.
    593   const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
    594   OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
    595 
    596   if (Symbol) {
    597     OS << ',';
    598     Symbol->print(OS, MAI);
    599     OS << ',' << Size;
    600     if (ByteAlignment != 0)
    601       OS << ',' << Log2_32(ByteAlignment);
    602   }
    603   EmitEOL();
    604 }
    605 
    606 // .tbss sym, size, align
    607 // This depends that the symbol has already been mangled from the original,
    608 // e.g. _a.
    609 void MCAsmStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
    610                                    uint64_t Size, unsigned ByteAlignment) {
    611   AssignFragment(Symbol, &Section->getDummyFragment());
    612 
    613   assert(Symbol && "Symbol shouldn't be NULL!");
    614   // Instead of using the Section we'll just use the shortcut.
    615   // This is a mach-o specific directive and section.
    616   OS << ".tbss ";
    617   Symbol->print(OS, MAI);
    618   OS << ", " << Size;
    619 
    620   // Output align if we have it.  We default to 1 so don't bother printing
    621   // that.
    622   if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
    623 
    624   EmitEOL();
    625 }
    626 
    627 static inline char toOctal(int X) { return (X&7)+'0'; }
    628 
    629 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
    630   OS << '"';
    631 
    632   for (unsigned i = 0, e = Data.size(); i != e; ++i) {
    633     unsigned char C = Data[i];
    634     if (C == '"' || C == '\\') {
    635       OS << '\\' << (char)C;
    636       continue;
    637     }
    638 
    639     if (isprint((unsigned char)C)) {
    640       OS << (char)C;
    641       continue;
    642     }
    643 
    644     switch (C) {
    645       case '\b': OS << "\\b"; break;
    646       case '\f': OS << "\\f"; break;
    647       case '\n': OS << "\\n"; break;
    648       case '\r': OS << "\\r"; break;
    649       case '\t': OS << "\\t"; break;
    650       default:
    651         OS << '\\';
    652         OS << toOctal(C >> 6);
    653         OS << toOctal(C >> 3);
    654         OS << toOctal(C >> 0);
    655         break;
    656     }
    657   }
    658 
    659   OS << '"';
    660 }
    661 
    662 void MCAsmStreamer::EmitBytes(StringRef Data) {
    663   assert(getCurrentSection().first &&
    664          "Cannot emit contents before setting section!");
    665   if (Data.empty()) return;
    666 
    667   if (Data.size() == 1) {
    668     OS << MAI->getData8bitsDirective();
    669     OS << (unsigned)(unsigned char)Data[0];
    670     EmitEOL();
    671     return;
    672   }
    673 
    674   // If the data ends with 0 and the target supports .asciz, use it, otherwise
    675   // use .ascii
    676   if (MAI->getAscizDirective() && Data.back() == 0) {
    677     OS << MAI->getAscizDirective();
    678     Data = Data.substr(0, Data.size()-1);
    679   } else {
    680     OS << MAI->getAsciiDirective();
    681   }
    682 
    683   PrintQuotedString(Data, OS);
    684   EmitEOL();
    685 }
    686 
    687 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
    688   EmitValue(MCConstantExpr::create(Value, getContext()), Size);
    689 }
    690 
    691 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
    692                                   SMLoc Loc) {
    693   assert(Size <= 8 && "Invalid size");
    694   assert(getCurrentSection().first &&
    695          "Cannot emit contents before setting section!");
    696   const char *Directive = nullptr;
    697   switch (Size) {
    698   default: break;
    699   case 1: Directive = MAI->getData8bitsDirective();  break;
    700   case 2: Directive = MAI->getData16bitsDirective(); break;
    701   case 4: Directive = MAI->getData32bitsDirective(); break;
    702   case 8: Directive = MAI->getData64bitsDirective(); break;
    703   }
    704 
    705   if (!Directive) {
    706     int64_t IntValue;
    707     if (!Value->evaluateAsAbsolute(IntValue))
    708       report_fatal_error("Don't know how to emit this value.");
    709 
    710     // We couldn't handle the requested integer size so we fallback by breaking
    711     // the request down into several, smaller, integers.  Since sizes greater
    712     // than eight are invalid and size equivalent to eight should have been
    713     // handled earlier, we use four bytes as our largest piece of granularity.
    714     bool IsLittleEndian = MAI->isLittleEndian();
    715     for (unsigned Emitted = 0; Emitted != Size;) {
    716       unsigned Remaining = Size - Emitted;
    717       // The size of our partial emission must be a power of two less than
    718       // eight.
    719       unsigned EmissionSize = PowerOf2Floor(Remaining);
    720       if (EmissionSize > 4)
    721         EmissionSize = 4;
    722       // Calculate the byte offset of our partial emission taking into account
    723       // the endianness of the target.
    724       unsigned ByteOffset =
    725           IsLittleEndian ? Emitted : (Remaining - EmissionSize);
    726       uint64_t ValueToEmit = IntValue >> (ByteOffset * 8);
    727       // We truncate our partial emission to fit within the bounds of the
    728       // emission domain.  This produces nicer output and silences potential
    729       // truncation warnings when round tripping through another assembler.
    730       uint64_t Shift = 64 - EmissionSize * 8;
    731       assert(Shift < static_cast<uint64_t>(
    732                          std::numeric_limits<unsigned long long>::digits) &&
    733              "undefined behavior");
    734       ValueToEmit &= ~0ULL >> Shift;
    735       EmitIntValue(ValueToEmit, EmissionSize);
    736       Emitted += EmissionSize;
    737     }
    738     return;
    739   }
    740 
    741   assert(Directive && "Invalid size for machine code value!");
    742   OS << Directive;
    743   Value->print(OS, MAI);
    744   EmitEOL();
    745 }
    746 
    747 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
    748   int64_t IntValue;
    749   if (Value->evaluateAsAbsolute(IntValue)) {
    750     EmitULEB128IntValue(IntValue);
    751     return;
    752   }
    753   OS << ".uleb128 ";
    754   Value->print(OS, MAI);
    755   EmitEOL();
    756 }
    757 
    758 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
    759   int64_t IntValue;
    760   if (Value->evaluateAsAbsolute(IntValue)) {
    761     EmitSLEB128IntValue(IntValue);
    762     return;
    763   }
    764   OS << ".sleb128 ";
    765   Value->print(OS, MAI);
    766   EmitEOL();
    767 }
    768 
    769 void MCAsmStreamer::EmitGPRel64Value(const MCExpr *Value) {
    770   assert(MAI->getGPRel64Directive() != nullptr);
    771   OS << MAI->getGPRel64Directive();
    772   Value->print(OS, MAI);
    773   EmitEOL();
    774 }
    775 
    776 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
    777   assert(MAI->getGPRel32Directive() != nullptr);
    778   OS << MAI->getGPRel32Directive();
    779   Value->print(OS, MAI);
    780   EmitEOL();
    781 }
    782 
    783 /// EmitFill - Emit NumBytes bytes worth of the value specified by
    784 /// FillValue.  This implements directives such as '.space'.
    785 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
    786   if (NumBytes == 0) return;
    787 
    788   if (const char *ZeroDirective = MAI->getZeroDirective()) {
    789     OS << ZeroDirective << NumBytes;
    790     if (FillValue != 0)
    791       OS << ',' << (int)FillValue;
    792     EmitEOL();
    793     return;
    794   }
    795 
    796   // Emit a byte at a time.
    797   MCStreamer::EmitFill(NumBytes, FillValue);
    798 }
    799 
    800 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
    801                                          unsigned ValueSize,
    802                                          unsigned MaxBytesToEmit) {
    803   // Some assemblers don't support non-power of two alignments, so we always
    804   // emit alignments as a power of two if possible.
    805   if (isPowerOf2_32(ByteAlignment)) {
    806     switch (ValueSize) {
    807     default:
    808       llvm_unreachable("Invalid size for machine code value!");
    809     case 1:
    810       OS << "\t.align\t";
    811       break;
    812     case 2:
    813       OS << ".p2alignw ";
    814       break;
    815     case 4:
    816       OS << ".p2alignl ";
    817       break;
    818     case 8:
    819       llvm_unreachable("Unsupported alignment size!");
    820     }
    821 
    822     if (MAI->getAlignmentIsInBytes())
    823       OS << ByteAlignment;
    824     else
    825       OS << Log2_32(ByteAlignment);
    826 
    827     if (Value || MaxBytesToEmit) {
    828       OS << ", 0x";
    829       OS.write_hex(truncateToSize(Value, ValueSize));
    830 
    831       if (MaxBytesToEmit)
    832         OS << ", " << MaxBytesToEmit;
    833     }
    834     EmitEOL();
    835     return;
    836   }
    837 
    838   // Non-power of two alignment.  This is not widely supported by assemblers.
    839   // FIXME: Parameterize this based on MAI.
    840   switch (ValueSize) {
    841   default: llvm_unreachable("Invalid size for machine code value!");
    842   case 1: OS << ".balign";  break;
    843   case 2: OS << ".balignw"; break;
    844   case 4: OS << ".balignl"; break;
    845   case 8: llvm_unreachable("Unsupported alignment size!");
    846   }
    847 
    848   OS << ' ' << ByteAlignment;
    849   OS << ", " << truncateToSize(Value, ValueSize);
    850   if (MaxBytesToEmit)
    851     OS << ", " << MaxBytesToEmit;
    852   EmitEOL();
    853 }
    854 
    855 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
    856                                       unsigned MaxBytesToEmit) {
    857   // Emit with a text fill value.
    858   EmitValueToAlignment(ByteAlignment, MAI->getTextAlignFillValue(),
    859                        1, MaxBytesToEmit);
    860 }
    861 
    862 void MCAsmStreamer::emitValueToOffset(const MCExpr *Offset,
    863                                       unsigned char Value) {
    864   // FIXME: Verify that Offset is associated with the current section.
    865   OS << ".org ";
    866   Offset->print(OS, MAI);
    867   OS << ", " << (unsigned)Value;
    868   EmitEOL();
    869 }
    870 
    871 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
    872   assert(MAI->hasSingleParameterDotFile());
    873   OS << "\t.file\t";
    874   PrintQuotedString(Filename, OS);
    875   EmitEOL();
    876 }
    877 
    878 unsigned MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo,
    879                                                StringRef Directory,
    880                                                StringRef Filename,
    881                                                unsigned CUID) {
    882   assert(CUID == 0);
    883 
    884   MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
    885   unsigned NumFiles = Table.getMCDwarfFiles().size();
    886   FileNo = Table.getFile(Directory, Filename, FileNo);
    887   if (FileNo == 0)
    888     return 0;
    889   if (NumFiles == Table.getMCDwarfFiles().size())
    890     return FileNo;
    891 
    892   SmallString<128> FullPathName;
    893 
    894   if (!UseDwarfDirectory && !Directory.empty()) {
    895     if (sys::path::is_absolute(Filename))
    896       Directory = "";
    897     else {
    898       FullPathName = Directory;
    899       sys::path::append(FullPathName, Filename);
    900       Directory = "";
    901       Filename = FullPathName;
    902     }
    903   }
    904 
    905   OS << "\t.file\t" << FileNo << ' ';
    906   if (!Directory.empty()) {
    907     PrintQuotedString(Directory, OS);
    908     OS << ' ';
    909   }
    910   PrintQuotedString(Filename, OS);
    911   EmitEOL();
    912 
    913   return FileNo;
    914 }
    915 
    916 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    917                                           unsigned Column, unsigned Flags,
    918                                           unsigned Isa,
    919                                           unsigned Discriminator,
    920                                           StringRef FileName) {
    921   OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
    922   if (Flags & DWARF2_FLAG_BASIC_BLOCK)
    923     OS << " basic_block";
    924   if (Flags & DWARF2_FLAG_PROLOGUE_END)
    925     OS << " prologue_end";
    926   if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
    927     OS << " epilogue_begin";
    928 
    929   unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
    930   if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
    931     OS << " is_stmt ";
    932 
    933     if (Flags & DWARF2_FLAG_IS_STMT)
    934       OS << "1";
    935     else
    936       OS << "0";
    937   }
    938 
    939   if (Isa)
    940     OS << " isa " << Isa;
    941   if (Discriminator)
    942     OS << " discriminator " << Discriminator;
    943 
    944   if (IsVerboseAsm) {
    945     OS.PadToColumn(MAI->getCommentColumn());
    946     OS << MAI->getCommentString() << ' ' << FileName << ':'
    947        << Line << ':' << Column;
    948   }
    949   EmitEOL();
    950   this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
    951                                           Isa, Discriminator, FileName);
    952 }
    953 
    954 MCSymbol *MCAsmStreamer::getDwarfLineTableSymbol(unsigned CUID) {
    955   // Always use the zeroth line table, since asm syntax only supports one line
    956   // table for now.
    957   return MCStreamer::getDwarfLineTableSymbol(0);
    958 }
    959 
    960 void MCAsmStreamer::EmitIdent(StringRef IdentString) {
    961   assert(MAI->hasIdentDirective() && ".ident directive not supported");
    962   OS << "\t.ident\t";
    963   PrintQuotedString(IdentString, OS);
    964   EmitEOL();
    965 }
    966 
    967 void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
    968   MCStreamer::EmitCFISections(EH, Debug);
    969   OS << "\t.cfi_sections ";
    970   if (EH) {
    971     OS << ".eh_frame";
    972     if (Debug)
    973       OS << ", .debug_frame";
    974   } else if (Debug) {
    975     OS << ".debug_frame";
    976   }
    977 
    978   EmitEOL();
    979 }
    980 
    981 void MCAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
    982   OS << "\t.cfi_startproc";
    983   if (Frame.IsSimple)
    984     OS << " simple";
    985   EmitEOL();
    986 }
    987 
    988 void MCAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
    989   MCStreamer::EmitCFIEndProcImpl(Frame);
    990   OS << "\t.cfi_endproc";
    991   EmitEOL();
    992 }
    993 
    994 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
    995   if (!MAI->useDwarfRegNumForCFI()) {
    996     const MCRegisterInfo *MRI = getContext().getRegisterInfo();
    997     unsigned LLVMRegister = MRI->getLLVMRegNum(Register, true);
    998     InstPrinter->printRegName(OS, LLVMRegister);
    999   } else {
   1000     OS << Register;
   1001   }
   1002 }
   1003 
   1004 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
   1005   MCStreamer::EmitCFIDefCfa(Register, Offset);
   1006   OS << "\t.cfi_def_cfa ";
   1007   EmitRegisterName(Register);
   1008   OS << ", " << Offset;
   1009   EmitEOL();
   1010 }
   1011 
   1012 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
   1013   MCStreamer::EmitCFIDefCfaOffset(Offset);
   1014   OS << "\t.cfi_def_cfa_offset " << Offset;
   1015   EmitEOL();
   1016 }
   1017 
   1018 static void PrintCFIEscape(llvm::formatted_raw_ostream &OS, StringRef Values) {
   1019   OS << "\t.cfi_escape ";
   1020   if (!Values.empty()) {
   1021     size_t e = Values.size() - 1;
   1022     for (size_t i = 0; i < e; ++i)
   1023       OS << format("0x%02x", uint8_t(Values[i])) << ", ";
   1024     OS << format("0x%02x", uint8_t(Values[e]));
   1025   }
   1026 }
   1027 
   1028 void MCAsmStreamer::EmitCFIEscape(StringRef Values) {
   1029   MCStreamer::EmitCFIEscape(Values);
   1030   PrintCFIEscape(OS, Values);
   1031   EmitEOL();
   1032 }
   1033 
   1034 void MCAsmStreamer::EmitCFIGnuArgsSize(int64_t Size) {
   1035   MCStreamer::EmitCFIGnuArgsSize(Size);
   1036 
   1037   uint8_t Buffer[16] = { dwarf::DW_CFA_GNU_args_size };
   1038   unsigned Len = encodeULEB128(Size, Buffer + 1) + 1;
   1039 
   1040   PrintCFIEscape(OS, StringRef((const char *)&Buffer[0], Len));
   1041   EmitEOL();
   1042 }
   1043 
   1044 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
   1045   MCStreamer::EmitCFIDefCfaRegister(Register);
   1046   OS << "\t.cfi_def_cfa_register ";
   1047   EmitRegisterName(Register);
   1048   EmitEOL();
   1049 }
   1050 
   1051 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
   1052   this->MCStreamer::EmitCFIOffset(Register, Offset);
   1053   OS << "\t.cfi_offset ";
   1054   EmitRegisterName(Register);
   1055   OS << ", " << Offset;
   1056   EmitEOL();
   1057 }
   1058 
   1059 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
   1060                                        unsigned Encoding) {
   1061   MCStreamer::EmitCFIPersonality(Sym, Encoding);
   1062   OS << "\t.cfi_personality " << Encoding << ", ";
   1063   Sym->print(OS, MAI);
   1064   EmitEOL();
   1065 }
   1066 
   1067 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
   1068   MCStreamer::EmitCFILsda(Sym, Encoding);
   1069   OS << "\t.cfi_lsda " << Encoding << ", ";
   1070   Sym->print(OS, MAI);
   1071   EmitEOL();
   1072 }
   1073 
   1074 void MCAsmStreamer::EmitCFIRememberState() {
   1075   MCStreamer::EmitCFIRememberState();
   1076   OS << "\t.cfi_remember_state";
   1077   EmitEOL();
   1078 }
   1079 
   1080 void MCAsmStreamer::EmitCFIRestoreState() {
   1081   MCStreamer::EmitCFIRestoreState();
   1082   OS << "\t.cfi_restore_state";
   1083   EmitEOL();
   1084 }
   1085 
   1086 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
   1087   MCStreamer::EmitCFISameValue(Register);
   1088   OS << "\t.cfi_same_value ";
   1089   EmitRegisterName(Register);
   1090   EmitEOL();
   1091 }
   1092 
   1093 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
   1094   MCStreamer::EmitCFIRelOffset(Register, Offset);
   1095   OS << "\t.cfi_rel_offset ";
   1096   EmitRegisterName(Register);
   1097   OS << ", " << Offset;
   1098   EmitEOL();
   1099 }
   1100 
   1101 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
   1102   MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
   1103   OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
   1104   EmitEOL();
   1105 }
   1106 
   1107 void MCAsmStreamer::EmitCFISignalFrame() {
   1108   MCStreamer::EmitCFISignalFrame();
   1109   OS << "\t.cfi_signal_frame";
   1110   EmitEOL();
   1111 }
   1112 
   1113 void MCAsmStreamer::EmitCFIUndefined(int64_t Register) {
   1114   MCStreamer::EmitCFIUndefined(Register);
   1115   OS << "\t.cfi_undefined " << Register;
   1116   EmitEOL();
   1117 }
   1118 
   1119 void MCAsmStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
   1120   MCStreamer::EmitCFIRegister(Register1, Register2);
   1121   OS << "\t.cfi_register " << Register1 << ", " << Register2;
   1122   EmitEOL();
   1123 }
   1124 
   1125 void MCAsmStreamer::EmitCFIWindowSave() {
   1126   MCStreamer::EmitCFIWindowSave();
   1127   OS << "\t.cfi_window_save";
   1128   EmitEOL();
   1129 }
   1130 
   1131 void MCAsmStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
   1132   MCStreamer::EmitWinCFIStartProc(Symbol);
   1133 
   1134   OS << ".seh_proc ";
   1135   Symbol->print(OS, MAI);
   1136   EmitEOL();
   1137 }
   1138 
   1139 void MCAsmStreamer::EmitWinCFIEndProc() {
   1140   MCStreamer::EmitWinCFIEndProc();
   1141 
   1142   OS << "\t.seh_endproc";
   1143   EmitEOL();
   1144 }
   1145 
   1146 void MCAsmStreamer::EmitWinCFIStartChained() {
   1147   MCStreamer::EmitWinCFIStartChained();
   1148 
   1149   OS << "\t.seh_startchained";
   1150   EmitEOL();
   1151 }
   1152 
   1153 void MCAsmStreamer::EmitWinCFIEndChained() {
   1154   MCStreamer::EmitWinCFIEndChained();
   1155 
   1156   OS << "\t.seh_endchained";
   1157   EmitEOL();
   1158 }
   1159 
   1160 void MCAsmStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
   1161                                       bool Except) {
   1162   MCStreamer::EmitWinEHHandler(Sym, Unwind, Except);
   1163 
   1164   OS << "\t.seh_handler ";
   1165   Sym->print(OS, MAI);
   1166   if (Unwind)
   1167     OS << ", @unwind";
   1168   if (Except)
   1169     OS << ", @except";
   1170   EmitEOL();
   1171 }
   1172 
   1173 void MCAsmStreamer::EmitWinEHHandlerData() {
   1174   MCStreamer::EmitWinEHHandlerData();
   1175 
   1176   // Switch sections. Don't call SwitchSection directly, because that will
   1177   // cause the section switch to be visible in the emitted assembly.
   1178   // We only do this so the section switch that terminates the handler
   1179   // data block is visible.
   1180   WinEH::FrameInfo *CurFrame = getCurrentWinFrameInfo();
   1181   MCSection *XData =
   1182       WinEH::UnwindEmitter::getXDataSection(CurFrame->Function, getContext());
   1183   SwitchSectionNoChange(XData);
   1184 
   1185   OS << "\t.seh_handlerdata";
   1186   EmitEOL();
   1187 }
   1188 
   1189 void MCAsmStreamer::EmitWinCFIPushReg(unsigned Register) {
   1190   MCStreamer::EmitWinCFIPushReg(Register);
   1191 
   1192   OS << "\t.seh_pushreg " << Register;
   1193   EmitEOL();
   1194 }
   1195 
   1196 void MCAsmStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
   1197   MCStreamer::EmitWinCFISetFrame(Register, Offset);
   1198 
   1199   OS << "\t.seh_setframe " << Register << ", " << Offset;
   1200   EmitEOL();
   1201 }
   1202 
   1203 void MCAsmStreamer::EmitWinCFIAllocStack(unsigned Size) {
   1204   MCStreamer::EmitWinCFIAllocStack(Size);
   1205 
   1206   OS << "\t.seh_stackalloc " << Size;
   1207   EmitEOL();
   1208 }
   1209 
   1210 void MCAsmStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
   1211   MCStreamer::EmitWinCFISaveReg(Register, Offset);
   1212 
   1213   OS << "\t.seh_savereg " << Register << ", " << Offset;
   1214   EmitEOL();
   1215 }
   1216 
   1217 void MCAsmStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
   1218   MCStreamer::EmitWinCFISaveXMM(Register, Offset);
   1219 
   1220   OS << "\t.seh_savexmm " << Register << ", " << Offset;
   1221   EmitEOL();
   1222 }
   1223 
   1224 void MCAsmStreamer::EmitWinCFIPushFrame(bool Code) {
   1225   MCStreamer::EmitWinCFIPushFrame(Code);
   1226 
   1227   OS << "\t.seh_pushframe";
   1228   if (Code)
   1229     OS << " @code";
   1230   EmitEOL();
   1231 }
   1232 
   1233 void MCAsmStreamer::EmitWinCFIEndProlog() {
   1234   MCStreamer::EmitWinCFIEndProlog();
   1235 
   1236   OS << "\t.seh_endprologue";
   1237   EmitEOL();
   1238 }
   1239 
   1240 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst,
   1241                                        const MCSubtargetInfo &STI) {
   1242   raw_ostream &OS = GetCommentOS();
   1243   SmallString<256> Code;
   1244   SmallVector<MCFixup, 4> Fixups;
   1245   raw_svector_ostream VecOS(Code);
   1246   Emitter->encodeInstruction(Inst, VecOS, Fixups, STI);
   1247 
   1248   // If we are showing fixups, create symbolic markers in the encoded
   1249   // representation. We do this by making a per-bit map to the fixup item index,
   1250   // then trying to display it as nicely as possible.
   1251   SmallVector<uint8_t, 64> FixupMap;
   1252   FixupMap.resize(Code.size() * 8);
   1253   for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
   1254     FixupMap[i] = 0;
   1255 
   1256   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
   1257     MCFixup &F = Fixups[i];
   1258     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
   1259     for (unsigned j = 0; j != Info.TargetSize; ++j) {
   1260       unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
   1261       assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
   1262       FixupMap[Index] = 1 + i;
   1263     }
   1264   }
   1265 
   1266   // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
   1267   // high order halfword of a 32-bit Thumb2 instruction is emitted first.
   1268   OS << "encoding: [";
   1269   for (unsigned i = 0, e = Code.size(); i != e; ++i) {
   1270     if (i)
   1271       OS << ',';
   1272 
   1273     // See if all bits are the same map entry.
   1274     uint8_t MapEntry = FixupMap[i * 8 + 0];
   1275     for (unsigned j = 1; j != 8; ++j) {
   1276       if (FixupMap[i * 8 + j] == MapEntry)
   1277         continue;
   1278 
   1279       MapEntry = uint8_t(~0U);
   1280       break;
   1281     }
   1282 
   1283     if (MapEntry != uint8_t(~0U)) {
   1284       if (MapEntry == 0) {
   1285         OS << format("0x%02x", uint8_t(Code[i]));
   1286       } else {
   1287         if (Code[i]) {
   1288           // FIXME: Some of the 8 bits require fix up.
   1289           OS << format("0x%02x", uint8_t(Code[i])) << '\''
   1290              << char('A' + MapEntry - 1) << '\'';
   1291         } else
   1292           OS << char('A' + MapEntry - 1);
   1293       }
   1294     } else {
   1295       // Otherwise, write out in binary.
   1296       OS << "0b";
   1297       for (unsigned j = 8; j--;) {
   1298         unsigned Bit = (Code[i] >> j) & 1;
   1299 
   1300         unsigned FixupBit;
   1301         if (MAI->isLittleEndian())
   1302           FixupBit = i * 8 + j;
   1303         else
   1304           FixupBit = i * 8 + (7-j);
   1305 
   1306         if (uint8_t MapEntry = FixupMap[FixupBit]) {
   1307           assert(Bit == 0 && "Encoder wrote into fixed up bit!");
   1308           OS << char('A' + MapEntry - 1);
   1309         } else
   1310           OS << Bit;
   1311       }
   1312     }
   1313   }
   1314   OS << "]\n";
   1315 
   1316   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
   1317     MCFixup &F = Fixups[i];
   1318     const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
   1319     OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
   1320        << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
   1321   }
   1322 }
   1323 
   1324 void MCAsmStreamer::EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) {
   1325   assert(getCurrentSection().first &&
   1326          "Cannot emit contents before setting section!");
   1327 
   1328   // Show the encoding in a comment if we have a code emitter.
   1329   if (Emitter)
   1330     AddEncodingComment(Inst, STI);
   1331 
   1332   // Show the MCInst if enabled.
   1333   if (ShowInst) {
   1334     Inst.dump_pretty(GetCommentOS(), InstPrinter.get(), "\n ");
   1335     GetCommentOS() << "\n";
   1336   }
   1337 
   1338   if(getTargetStreamer())
   1339     getTargetStreamer()->prettyPrintAsm(*InstPrinter, OS, Inst, STI);
   1340   else
   1341     InstPrinter->printInst(&Inst, OS, "", STI);
   1342 
   1343   EmitEOL();
   1344 }
   1345 
   1346 void MCAsmStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
   1347   OS << "\t.bundle_align_mode " << AlignPow2;
   1348   EmitEOL();
   1349 }
   1350 
   1351 void MCAsmStreamer::EmitBundleLock(bool AlignToEnd) {
   1352   OS << "\t.bundle_lock";
   1353   if (AlignToEnd)
   1354     OS << " align_to_end";
   1355   EmitEOL();
   1356 }
   1357 
   1358 void MCAsmStreamer::EmitBundleUnlock() {
   1359   OS << "\t.bundle_unlock";
   1360   EmitEOL();
   1361 }
   1362 
   1363 bool MCAsmStreamer::EmitRelocDirective(const MCExpr &Offset, StringRef Name,
   1364                                        const MCExpr *Expr, SMLoc) {
   1365   OS << "\t.reloc ";
   1366   Offset.print(OS, MAI);
   1367   OS << ", " << Name;
   1368   if (Expr) {
   1369     OS << ", ";
   1370     Expr->print(OS, MAI);
   1371   }
   1372   EmitEOL();
   1373   return false;
   1374 }
   1375 
   1376 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
   1377 /// the specified string in the output .s file.  This capability is
   1378 /// indicated by the hasRawTextSupport() predicate.
   1379 void MCAsmStreamer::EmitRawTextImpl(StringRef String) {
   1380   if (!String.empty() && String.back() == '\n')
   1381     String = String.substr(0, String.size()-1);
   1382   OS << String;
   1383   EmitEOL();
   1384 }
   1385 
   1386 void MCAsmStreamer::FinishImpl() {
   1387   // If we are generating dwarf for assembly source files dump out the sections.
   1388   if (getContext().getGenDwarfForAssembly())
   1389     MCGenDwarfInfo::Emit(this);
   1390 
   1391   // Emit the label for the line table, if requested - since the rest of the
   1392   // line table will be defined by .loc/.file directives, and not emitted
   1393   // directly, the label is the only work required here.
   1394   auto &Tables = getContext().getMCDwarfLineTables();
   1395   if (!Tables.empty()) {
   1396     assert(Tables.size() == 1 && "asm output only supports one line table");
   1397     if (auto *Label = Tables.begin()->second.getLabel()) {
   1398       SwitchSection(getContext().getObjectFileInfo()->getDwarfLineSection());
   1399       EmitLabel(Label);
   1400     }
   1401   }
   1402 }
   1403 
   1404 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
   1405                                     std::unique_ptr<formatted_raw_ostream> OS,
   1406                                     bool isVerboseAsm, bool useDwarfDirectory,
   1407                                     MCInstPrinter *IP, MCCodeEmitter *CE,
   1408                                     MCAsmBackend *MAB, bool ShowInst) {
   1409   return new MCAsmStreamer(Context, std::move(OS), isVerboseAsm,
   1410                            useDwarfDirectory, IP, CE, MAB, ShowInst);
   1411 }
   1412