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      1 //===- lib/MC/MCStreamer.cpp - Streaming Machine Code 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/MCAsmInfo.h"
     11 #include "llvm/MC/MCContext.h"
     12 #include "llvm/MC/MCStreamer.h"
     13 #include "llvm/MC/MCExpr.h"
     14 #include "llvm/MC/MCObjectWriter.h"
     15 #include "llvm/MC/MCSymbol.h"
     16 #include "llvm/Support/ErrorHandling.h"
     17 #include "llvm/Support/raw_ostream.h"
     18 #include "llvm/ADT/SmallString.h"
     19 #include "llvm/ADT/Twine.h"
     20 #include <cstdlib>
     21 using namespace llvm;
     22 
     23 MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), EmitEHFrame(true),
     24                                          EmitDebugFrame(false),
     25                                          CurrentW64UnwindInfo(0) {
     26   const MCSection *section = NULL;
     27   SectionStack.push_back(std::make_pair(section, section));
     28 }
     29 
     30 MCStreamer::~MCStreamer() {
     31   for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
     32     delete W64UnwindInfos[i];
     33 }
     34 
     35 const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
     36                                           const MCSymbol *A,
     37                                           const MCSymbol *B) {
     38   MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
     39   const MCExpr *ARef =
     40     MCSymbolRefExpr::Create(A, Variant, Context);
     41   const MCExpr *BRef =
     42     MCSymbolRefExpr::Create(B, Variant, Context);
     43   const MCExpr *AddrDelta =
     44     MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
     45   return AddrDelta;
     46 }
     47 
     48 const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
     49   if (Context.getAsmInfo().hasAggressiveSymbolFolding() ||
     50       isa<MCSymbolRefExpr>(Expr))
     51     return Expr;
     52 
     53   MCSymbol *ABS = Context.CreateTempSymbol();
     54   EmitAssignment(ABS, Expr);
     55   return MCSymbolRefExpr::Create(ABS, Context);
     56 }
     57 
     58 raw_ostream &MCStreamer::GetCommentOS() {
     59   // By default, discard comments.
     60   return nulls();
     61 }
     62 
     63 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
     64                                       const MCSymbol *Label, int PointerSize) {
     65   // emit the sequence to set the address
     66   EmitIntValue(dwarf::DW_LNS_extended_op, 1);
     67   EmitULEB128IntValue(PointerSize + 1);
     68   EmitIntValue(dwarf::DW_LNE_set_address, 1);
     69   EmitSymbolValue(Label, PointerSize);
     70 
     71   // emit the sequence for the LineDelta (from 1) and a zero address delta.
     72   MCDwarfLineAddr::Emit(this, LineDelta, 0);
     73 }
     74 
     75 /// EmitIntValue - Special case of EmitValue that avoids the client having to
     76 /// pass in a MCExpr for constant integers.
     77 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
     78                               unsigned AddrSpace) {
     79   assert(Size <= 8 && "Invalid size");
     80   assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
     81          "Invalid size");
     82   char buf[8];
     83   const bool isLittleEndian = Context.getAsmInfo().isLittleEndian();
     84   for (unsigned i = 0; i != Size; ++i) {
     85     unsigned index = isLittleEndian ? i : (Size - i - 1);
     86     buf[i] = uint8_t(Value >> (index * 8));
     87   }
     88   EmitBytes(StringRef(buf, Size), AddrSpace);
     89 }
     90 
     91 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
     92 /// client having to pass in a MCExpr for constant integers.
     93 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) {
     94   SmallString<32> Tmp;
     95   raw_svector_ostream OSE(Tmp);
     96   MCObjectWriter::EncodeULEB128(Value, OSE);
     97   EmitBytes(OSE.str(), AddrSpace);
     98 }
     99 
    100 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
    101 /// client having to pass in a MCExpr for constant integers.
    102 void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
    103   SmallString<32> Tmp;
    104   raw_svector_ostream OSE(Tmp);
    105   MCObjectWriter::EncodeSLEB128(Value, OSE);
    106   EmitBytes(OSE.str(), AddrSpace);
    107 }
    108 
    109 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
    110                               unsigned AddrSpace) {
    111   const MCExpr *ABS = ForceExpAbs(Value);
    112   EmitValue(ABS, Size, AddrSpace);
    113 }
    114 
    115 
    116 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
    117                            unsigned AddrSpace) {
    118   EmitValueImpl(Value, Size, AddrSpace);
    119 }
    120 
    121 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
    122                                   unsigned AddrSpace) {
    123   EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size,
    124                 AddrSpace);
    125 }
    126 
    127 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
    128   report_fatal_error("unsupported directive in streamer");
    129 }
    130 
    131 /// EmitFill - Emit NumBytes bytes worth of the value specified by
    132 /// FillValue.  This implements directives such as '.space'.
    133 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
    134                           unsigned AddrSpace) {
    135   const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
    136   for (uint64_t i = 0, e = NumBytes; i != e; ++i)
    137     EmitValue(E, 1, AddrSpace);
    138 }
    139 
    140 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
    141                                         StringRef Filename) {
    142   return getContext().GetDwarfFile(Filename, FileNo) == 0;
    143 }
    144 
    145 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    146                                        unsigned Column, unsigned Flags,
    147                                        unsigned Isa,
    148                                        unsigned Discriminator,
    149                                        StringRef FileName) {
    150   getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
    151                                   Discriminator);
    152 }
    153 
    154 MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
    155   if (FrameInfos.empty())
    156     return NULL;
    157   return &FrameInfos.back();
    158 }
    159 
    160 void MCStreamer::EnsureValidFrame() {
    161   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    162   if (!CurFrame || CurFrame->End)
    163     report_fatal_error("No open frame");
    164 }
    165 
    166 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
    167                                      MCSymbol *EHSymbol) {
    168 }
    169 
    170 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
    171   assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
    172   assert(getCurrentSection() && "Cannot emit before setting section!");
    173   Symbol->setSection(*getCurrentSection());
    174 
    175   StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
    176   if (!Symbol->getName().startswith(Prefix))
    177     LastNonPrivate = Symbol;
    178 }
    179 
    180 void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
    181   EnsureValidFrame();
    182   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    183   CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
    184 }
    185 
    186 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
    187   assert(EH || Debug);
    188   EmitEHFrame = EH;
    189   EmitDebugFrame = Debug;
    190 }
    191 
    192 void MCStreamer::EmitCFIStartProc() {
    193   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    194   if (CurFrame && !CurFrame->End)
    195     report_fatal_error("Starting a frame before finishing the previous one!");
    196   MCDwarfFrameInfo Frame;
    197   Frame.Begin = getContext().CreateTempSymbol();
    198   Frame.Function = LastNonPrivate;
    199   EmitLabel(Frame.Begin);
    200   FrameInfos.push_back(Frame);
    201 }
    202 
    203 void MCStreamer::EmitCFIEndProc() {
    204   EnsureValidFrame();
    205   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    206   CurFrame->End = getContext().CreateTempSymbol();
    207   EmitLabel(CurFrame->End);
    208 }
    209 
    210 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
    211   EnsureValidFrame();
    212   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    213   MCSymbol *Label = getContext().CreateTempSymbol();
    214   EmitLabel(Label);
    215   MachineLocation Dest(MachineLocation::VirtualFP);
    216   MachineLocation Source(Register, -Offset);
    217   MCCFIInstruction Instruction(Label, Dest, Source);
    218   CurFrame->Instructions.push_back(Instruction);
    219 }
    220 
    221 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
    222   EnsureValidFrame();
    223   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    224   MCSymbol *Label = getContext().CreateTempSymbol();
    225   EmitLabel(Label);
    226   MachineLocation Dest(MachineLocation::VirtualFP);
    227   MachineLocation Source(MachineLocation::VirtualFP, -Offset);
    228   MCCFIInstruction Instruction(Label, Dest, Source);
    229   CurFrame->Instructions.push_back(Instruction);
    230 }
    231 
    232 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
    233   EnsureValidFrame();
    234   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    235   MCSymbol *Label = getContext().CreateTempSymbol();
    236   EmitLabel(Label);
    237   MachineLocation Dest(MachineLocation::VirtualFP);
    238   MachineLocation Source(MachineLocation::VirtualFP, Adjustment);
    239   MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
    240   CurFrame->Instructions.push_back(Instruction);
    241 }
    242 
    243 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
    244   EnsureValidFrame();
    245   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    246   MCSymbol *Label = getContext().CreateTempSymbol();
    247   EmitLabel(Label);
    248   MachineLocation Dest(Register);
    249   MachineLocation Source(MachineLocation::VirtualFP);
    250   MCCFIInstruction Instruction(Label, Dest, Source);
    251   CurFrame->Instructions.push_back(Instruction);
    252 }
    253 
    254 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
    255   EnsureValidFrame();
    256   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    257   MCSymbol *Label = getContext().CreateTempSymbol();
    258   EmitLabel(Label);
    259   MachineLocation Dest(Register, Offset);
    260   MachineLocation Source(Register, Offset);
    261   MCCFIInstruction Instruction(Label, Dest, Source);
    262   CurFrame->Instructions.push_back(Instruction);
    263 }
    264 
    265 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
    266   EnsureValidFrame();
    267   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    268   MCSymbol *Label = getContext().CreateTempSymbol();
    269   EmitLabel(Label);
    270   MachineLocation Dest(Register, Offset);
    271   MachineLocation Source(Register, Offset);
    272   MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
    273   CurFrame->Instructions.push_back(Instruction);
    274 }
    275 
    276 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
    277                                     unsigned Encoding) {
    278   EnsureValidFrame();
    279   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    280   CurFrame->Personality = Sym;
    281   CurFrame->PersonalityEncoding = Encoding;
    282 }
    283 
    284 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
    285   EnsureValidFrame();
    286   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    287   CurFrame->Lsda = Sym;
    288   CurFrame->LsdaEncoding = Encoding;
    289 }
    290 
    291 void MCStreamer::EmitCFIRememberState() {
    292   EnsureValidFrame();
    293   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    294   MCSymbol *Label = getContext().CreateTempSymbol();
    295   EmitLabel(Label);
    296   MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label);
    297   CurFrame->Instructions.push_back(Instruction);
    298 }
    299 
    300 void MCStreamer::EmitCFIRestoreState() {
    301   // FIXME: Error if there is no matching cfi_remember_state.
    302   EnsureValidFrame();
    303   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    304   MCSymbol *Label = getContext().CreateTempSymbol();
    305   EmitLabel(Label);
    306   MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label);
    307   CurFrame->Instructions.push_back(Instruction);
    308 }
    309 
    310 void MCStreamer::EmitCFISameValue(int64_t Register) {
    311   EnsureValidFrame();
    312   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    313   MCSymbol *Label = getContext().CreateTempSymbol();
    314   EmitLabel(Label);
    315   MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register);
    316   CurFrame->Instructions.push_back(Instruction);
    317 }
    318 
    319 void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
    320   W64UnwindInfos.push_back(Frame);
    321   CurrentW64UnwindInfo = W64UnwindInfos.back();
    322 }
    323 
    324 void MCStreamer::EnsureValidW64UnwindInfo() {
    325   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    326   if (!CurFrame || CurFrame->End)
    327     report_fatal_error("No open Win64 EH frame function!");
    328 }
    329 
    330 void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
    331   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    332   if (CurFrame && !CurFrame->End)
    333     report_fatal_error("Starting a function before ending the previous one!");
    334   MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
    335   Frame->Begin = getContext().CreateTempSymbol();
    336   Frame->Function = Symbol;
    337   EmitLabel(Frame->Begin);
    338   setCurrentW64UnwindInfo(Frame);
    339 }
    340 
    341 void MCStreamer::EmitWin64EHEndProc() {
    342   EnsureValidW64UnwindInfo();
    343   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    344   if (CurFrame->ChainedParent)
    345     report_fatal_error("Not all chained regions terminated!");
    346   CurFrame->End = getContext().CreateTempSymbol();
    347   EmitLabel(CurFrame->End);
    348 }
    349 
    350 void MCStreamer::EmitWin64EHStartChained() {
    351   EnsureValidW64UnwindInfo();
    352   MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
    353   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    354   Frame->Begin = getContext().CreateTempSymbol();
    355   Frame->Function = CurFrame->Function;
    356   Frame->ChainedParent = CurFrame;
    357   EmitLabel(Frame->Begin);
    358   setCurrentW64UnwindInfo(Frame);
    359 }
    360 
    361 void MCStreamer::EmitWin64EHEndChained() {
    362   EnsureValidW64UnwindInfo();
    363   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    364   if (!CurFrame->ChainedParent)
    365     report_fatal_error("End of a chained region outside a chained region!");
    366   CurFrame->End = getContext().CreateTempSymbol();
    367   EmitLabel(CurFrame->End);
    368   CurrentW64UnwindInfo = CurFrame->ChainedParent;
    369 }
    370 
    371 void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
    372                                     bool Except) {
    373   EnsureValidW64UnwindInfo();
    374   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    375   if (CurFrame->ChainedParent)
    376     report_fatal_error("Chained unwind areas can't have handlers!");
    377   CurFrame->ExceptionHandler = Sym;
    378   if (!Except && !Unwind)
    379     report_fatal_error("Don't know what kind of handler this is!");
    380   if (Unwind)
    381     CurFrame->HandlesUnwind = true;
    382   if (Except)
    383     CurFrame->HandlesExceptions = true;
    384 }
    385 
    386 void MCStreamer::EmitWin64EHHandlerData() {
    387   EnsureValidW64UnwindInfo();
    388   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    389   if (CurFrame->ChainedParent)
    390     report_fatal_error("Chained unwind areas can't have handlers!");
    391 }
    392 
    393 void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
    394   EnsureValidW64UnwindInfo();
    395   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    396   MCSymbol *Label = getContext().CreateTempSymbol();
    397   MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
    398   EmitLabel(Label);
    399   CurFrame->Instructions.push_back(Inst);
    400 }
    401 
    402 void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
    403   EnsureValidW64UnwindInfo();
    404   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    405   if (CurFrame->LastFrameInst >= 0)
    406     report_fatal_error("Frame register and offset already specified!");
    407   if (Offset & 0x0F)
    408     report_fatal_error("Misaligned frame pointer offset!");
    409   MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, NULL, Register, Offset);
    410   CurFrame->LastFrameInst = CurFrame->Instructions.size();
    411   CurFrame->Instructions.push_back(Inst);
    412 }
    413 
    414 void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
    415   EnsureValidW64UnwindInfo();
    416   if (Size & 7)
    417     report_fatal_error("Misaligned stack allocation!");
    418   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    419   MCSymbol *Label = getContext().CreateTempSymbol();
    420   MCWin64EHInstruction Inst(Label, Size);
    421   EmitLabel(Label);
    422   CurFrame->Instructions.push_back(Inst);
    423 }
    424 
    425 void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
    426   EnsureValidW64UnwindInfo();
    427   if (Offset & 7)
    428     report_fatal_error("Misaligned saved register offset!");
    429   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    430   MCSymbol *Label = getContext().CreateTempSymbol();
    431   MCWin64EHInstruction Inst(
    432      Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
    433                             Label, Register, Offset);
    434   EmitLabel(Label);
    435   CurFrame->Instructions.push_back(Inst);
    436 }
    437 
    438 void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
    439   EnsureValidW64UnwindInfo();
    440   if (Offset & 0x0F)
    441     report_fatal_error("Misaligned saved vector register offset!");
    442   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    443   MCSymbol *Label = getContext().CreateTempSymbol();
    444   MCWin64EHInstruction Inst(
    445     Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
    446                             Label, Register, Offset);
    447   EmitLabel(Label);
    448   CurFrame->Instructions.push_back(Inst);
    449 }
    450 
    451 void MCStreamer::EmitWin64EHPushFrame(bool Code) {
    452   EnsureValidW64UnwindInfo();
    453   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    454   if (CurFrame->Instructions.size() > 0)
    455     report_fatal_error("If present, PushMachFrame must be the first UOP");
    456   MCSymbol *Label = getContext().CreateTempSymbol();
    457   MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
    458   EmitLabel(Label);
    459   CurFrame->Instructions.push_back(Inst);
    460 }
    461 
    462 void MCStreamer::EmitWin64EHEndProlog() {
    463   EnsureValidW64UnwindInfo();
    464   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    465   CurFrame->PrologEnd = getContext().CreateTempSymbol();
    466   EmitLabel(CurFrame->PrologEnd);
    467 }
    468 
    469 void MCStreamer::EmitFnStart() {
    470   errs() << "Not implemented yet\n";
    471   abort();
    472 }
    473 
    474 void MCStreamer::EmitFnEnd() {
    475   errs() << "Not implemented yet\n";
    476   abort();
    477 }
    478 
    479 void MCStreamer::EmitCantUnwind() {
    480   errs() << "Not implemented yet\n";
    481   abort();
    482 }
    483 
    484 void MCStreamer::EmitHandlerData() {
    485   errs() << "Not implemented yet\n";
    486   abort();
    487 }
    488 
    489 void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
    490   errs() << "Not implemented yet\n";
    491   abort();
    492 }
    493 
    494 void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
    495   errs() << "Not implemented yet\n";
    496   abort();
    497 }
    498 
    499 void MCStreamer::EmitPad(int64_t Offset) {
    500   errs() << "Not implemented yet\n";
    501   abort();
    502 }
    503 
    504 void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
    505   errs() << "Not implemented yet\n";
    506   abort();
    507 }
    508 
    509 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
    510 /// the specified string in the output .s file.  This capability is
    511 /// indicated by the hasRawTextSupport() predicate.
    512 void MCStreamer::EmitRawText(StringRef String) {
    513   errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
    514   " something must not be fully mc'ized\n";
    515   abort();
    516 }
    517 
    518 void MCStreamer::EmitRawText(const Twine &T) {
    519   SmallString<128> Str;
    520   T.toVector(Str);
    521   EmitRawText(Str.str());
    522 }
    523 
    524 void MCStreamer::EmitFrames(bool usingCFI) {
    525   if (!getNumFrameInfos())
    526     return;
    527 
    528   if (EmitEHFrame)
    529     MCDwarfFrameEmitter::Emit(*this, usingCFI, true);
    530 
    531   if (EmitDebugFrame)
    532     MCDwarfFrameEmitter::Emit(*this, usingCFI, false);
    533 }
    534 
    535 void MCStreamer::EmitW64Tables() {
    536   if (!getNumW64UnwindInfos())
    537     return;
    538 
    539   MCWin64EHUnwindEmitter::Emit(*this);
    540 }
    541