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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/StringExtras.h"
     20 #include "llvm/ADT/Twine.h"
     21 #include <cstdlib>
     22 using namespace llvm;
     23 
     24 MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), EmitEHFrame(true),
     25                                          EmitDebugFrame(false),
     26                                          CurrentW64UnwindInfo(0),
     27                                          LastSymbol(0),
     28                                          UniqueCodeBeginSuffix(0),
     29                                          UniqueDataBeginSuffix(0) {
     30   const MCSection *section = NULL;
     31   SectionStack.push_back(std::make_pair(section, section));
     32 }
     33 
     34 MCStreamer::~MCStreamer() {
     35   for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
     36     delete W64UnwindInfos[i];
     37 }
     38 
     39 const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
     40                                           const MCSymbol *A,
     41                                           const MCSymbol *B) {
     42   MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
     43   const MCExpr *ARef =
     44     MCSymbolRefExpr::Create(A, Variant, Context);
     45   const MCExpr *BRef =
     46     MCSymbolRefExpr::Create(B, Variant, Context);
     47   const MCExpr *AddrDelta =
     48     MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
     49   return AddrDelta;
     50 }
     51 
     52 const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
     53   if (Context.getAsmInfo().hasAggressiveSymbolFolding() ||
     54       isa<MCSymbolRefExpr>(Expr))
     55     return Expr;
     56 
     57   MCSymbol *ABS = Context.CreateTempSymbol();
     58   EmitAssignment(ABS, Expr);
     59   return MCSymbolRefExpr::Create(ABS, Context);
     60 }
     61 
     62 raw_ostream &MCStreamer::GetCommentOS() {
     63   // By default, discard comments.
     64   return nulls();
     65 }
     66 
     67 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
     68                                       const MCSymbol *Label, int PointerSize) {
     69   // emit the sequence to set the address
     70   EmitIntValue(dwarf::DW_LNS_extended_op, 1);
     71   EmitULEB128IntValue(PointerSize + 1);
     72   EmitIntValue(dwarf::DW_LNE_set_address, 1);
     73   EmitSymbolValue(Label, PointerSize);
     74 
     75   // emit the sequence for the LineDelta (from 1) and a zero address delta.
     76   MCDwarfLineAddr::Emit(this, LineDelta, 0);
     77 }
     78 
     79 /// EmitIntValue - Special case of EmitValue that avoids the client having to
     80 /// pass in a MCExpr for constant integers.
     81 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
     82                               unsigned AddrSpace) {
     83   assert(Size <= 8 && "Invalid size");
     84   assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
     85          "Invalid size");
     86   char buf[8];
     87   const bool isLittleEndian = Context.getAsmInfo().isLittleEndian();
     88   for (unsigned i = 0; i != Size; ++i) {
     89     unsigned index = isLittleEndian ? i : (Size - i - 1);
     90     buf[i] = uint8_t(Value >> (index * 8));
     91   }
     92   EmitBytes(StringRef(buf, Size), AddrSpace);
     93 }
     94 
     95 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
     96 /// client having to pass in a MCExpr for constant integers.
     97 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) {
     98   SmallString<32> Tmp;
     99   raw_svector_ostream OSE(Tmp);
    100   MCObjectWriter::EncodeULEB128(Value, OSE);
    101   EmitBytes(OSE.str(), AddrSpace);
    102 }
    103 
    104 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
    105 /// client having to pass in a MCExpr for constant integers.
    106 void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
    107   SmallString<32> Tmp;
    108   raw_svector_ostream OSE(Tmp);
    109   MCObjectWriter::EncodeSLEB128(Value, OSE);
    110   EmitBytes(OSE.str(), AddrSpace);
    111 }
    112 
    113 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
    114                               unsigned AddrSpace) {
    115   const MCExpr *ABS = ForceExpAbs(Value);
    116   EmitValue(ABS, Size, AddrSpace);
    117 }
    118 
    119 
    120 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
    121                            unsigned AddrSpace) {
    122   EmitValueImpl(Value, Size, AddrSpace);
    123 }
    124 
    125 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
    126                                   unsigned AddrSpace) {
    127   EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size,
    128                 AddrSpace);
    129 }
    130 
    131 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
    132   report_fatal_error("unsupported directive in streamer");
    133 }
    134 
    135 /// EmitFill - Emit NumBytes bytes worth of the value specified by
    136 /// FillValue.  This implements directives such as '.space'.
    137 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
    138                           unsigned AddrSpace) {
    139   const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
    140   for (uint64_t i = 0, e = NumBytes; i != e; ++i)
    141     EmitValue(E, 1, AddrSpace);
    142 }
    143 
    144 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
    145                                         StringRef Filename) {
    146   return getContext().GetDwarfFile(Filename, FileNo) == 0;
    147 }
    148 
    149 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
    150                                        unsigned Column, unsigned Flags,
    151                                        unsigned Isa,
    152                                        unsigned Discriminator,
    153                                        StringRef FileName) {
    154   getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
    155                                   Discriminator);
    156 }
    157 
    158 MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
    159   if (FrameInfos.empty())
    160     return NULL;
    161   return &FrameInfos.back();
    162 }
    163 
    164 void MCStreamer::EnsureValidFrame() {
    165   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    166   if (!CurFrame || CurFrame->End)
    167     report_fatal_error("No open frame");
    168 }
    169 
    170 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
    171                                      MCSymbol *EHSymbol) {
    172 }
    173 
    174 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
    175   assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
    176   assert(getCurrentSection() && "Cannot emit before setting section!");
    177   Symbol->setSection(*getCurrentSection());
    178   LastSymbol = Symbol;
    179 }
    180 
    181 void MCStreamer::EmitDataRegion() {
    182   if (RegionIndicator == Data) return;
    183 
    184   MCContext &Context = getContext();
    185   const MCAsmInfo &MAI = Context.getAsmInfo();
    186   if (!MAI.getSupportsDataRegions()) return;
    187 
    188   // Generate a unique symbol name.
    189   MCSymbol *NewSym = Context.GetOrCreateSymbol(
    190       Twine(MAI.getDataBeginLabelName()) +
    191         utostr(UniqueDataBeginSuffix++));
    192   EmitLabel(NewSym);
    193 
    194   RegionIndicator = Data;
    195 }
    196 
    197 void MCStreamer::EmitCodeRegion() {
    198   if (RegionIndicator == Code) return;
    199 
    200   MCContext &Context = getContext();
    201   const MCAsmInfo &MAI = Context.getAsmInfo();
    202   if (!MAI.getSupportsDataRegions()) return;
    203 
    204   // Generate a unique symbol name.
    205   MCSymbol *NewSym = Context.GetOrCreateSymbol(
    206       Twine(MAI.getCodeBeginLabelName()) +
    207         utostr(UniqueCodeBeginSuffix++));
    208   EmitLabel(NewSym);
    209 
    210   RegionIndicator = Code;
    211 }
    212 
    213 void MCStreamer::EmitJumpTable8Region() {
    214   if (RegionIndicator == JumpTable8) return;
    215 
    216   MCContext &Context = getContext();
    217   const MCAsmInfo &MAI = Context.getAsmInfo();
    218   if (!MAI.getSupportsDataRegions()) return;
    219 
    220   // Generate a unique symbol name.
    221   MCSymbol *NewSym = Context.GetOrCreateSymbol(
    222       Twine(MAI.getJumpTable8BeginLabelName()) +
    223         utostr(UniqueDataBeginSuffix++));
    224   EmitLabel(NewSym);
    225 
    226   RegionIndicator = JumpTable8;
    227 }
    228 
    229 void MCStreamer::EmitJumpTable16Region() {
    230   if (RegionIndicator == JumpTable16) return;
    231 
    232   MCContext &Context = getContext();
    233   const MCAsmInfo &MAI = Context.getAsmInfo();
    234   if (!MAI.getSupportsDataRegions()) return;
    235 
    236   // Generate a unique symbol name.
    237   MCSymbol *NewSym = Context.GetOrCreateSymbol(
    238       Twine(MAI.getJumpTable16BeginLabelName()) +
    239         utostr(UniqueDataBeginSuffix++));
    240   EmitLabel(NewSym);
    241 
    242   RegionIndicator = JumpTable16;
    243 }
    244 
    245 
    246 void MCStreamer::EmitJumpTable32Region() {
    247   if (RegionIndicator == JumpTable32) return;
    248 
    249   MCContext &Context = getContext();
    250   const MCAsmInfo &MAI = Context.getAsmInfo();
    251   if (!MAI.getSupportsDataRegions()) return;
    252 
    253   // Generate a unique symbol name.
    254   MCSymbol *NewSym = Context.GetOrCreateSymbol(
    255       Twine(MAI.getJumpTable32BeginLabelName()) +
    256         utostr(UniqueDataBeginSuffix++));
    257   EmitLabel(NewSym);
    258 
    259   RegionIndicator = JumpTable32;
    260 }
    261 
    262 void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
    263   EnsureValidFrame();
    264   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    265   CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
    266 }
    267 
    268 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
    269   assert(EH || Debug);
    270   EmitEHFrame = EH;
    271   EmitDebugFrame = Debug;
    272 }
    273 
    274 void MCStreamer::EmitCFIStartProc() {
    275   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    276   if (CurFrame && !CurFrame->End)
    277     report_fatal_error("Starting a frame before finishing the previous one!");
    278 
    279   MCDwarfFrameInfo Frame;
    280   Frame.Function = LastSymbol;
    281 
    282   // If the function is externally visible, we need to create a local
    283   // symbol to avoid relocations.
    284   StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
    285   if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
    286     Frame.Begin = LastSymbol;
    287   } else {
    288     Frame.Begin = getContext().CreateTempSymbol();
    289     EmitLabel(Frame.Begin);
    290   }
    291 
    292   FrameInfos.push_back(Frame);
    293   RegionIndicator = Code;
    294 }
    295 
    296 void MCStreamer::EmitCFIEndProc() {
    297   EnsureValidFrame();
    298   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    299   CurFrame->End = getContext().CreateTempSymbol();
    300   EmitLabel(CurFrame->End);
    301 }
    302 
    303 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
    304   EnsureValidFrame();
    305   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    306   MCSymbol *Label = getContext().CreateTempSymbol();
    307   EmitLabel(Label);
    308   MachineLocation Dest(MachineLocation::VirtualFP);
    309   MachineLocation Source(Register, -Offset);
    310   MCCFIInstruction Instruction(Label, Dest, Source);
    311   CurFrame->Instructions.push_back(Instruction);
    312 }
    313 
    314 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
    315   EnsureValidFrame();
    316   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    317   MCSymbol *Label = getContext().CreateTempSymbol();
    318   EmitLabel(Label);
    319   MachineLocation Dest(MachineLocation::VirtualFP);
    320   MachineLocation Source(MachineLocation::VirtualFP, -Offset);
    321   MCCFIInstruction Instruction(Label, Dest, Source);
    322   CurFrame->Instructions.push_back(Instruction);
    323 }
    324 
    325 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
    326   EnsureValidFrame();
    327   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    328   MCSymbol *Label = getContext().CreateTempSymbol();
    329   EmitLabel(Label);
    330   MachineLocation Dest(MachineLocation::VirtualFP);
    331   MachineLocation Source(MachineLocation::VirtualFP, Adjustment);
    332   MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
    333   CurFrame->Instructions.push_back(Instruction);
    334 }
    335 
    336 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
    337   EnsureValidFrame();
    338   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    339   MCSymbol *Label = getContext().CreateTempSymbol();
    340   EmitLabel(Label);
    341   MachineLocation Dest(Register);
    342   MachineLocation Source(MachineLocation::VirtualFP);
    343   MCCFIInstruction Instruction(Label, Dest, Source);
    344   CurFrame->Instructions.push_back(Instruction);
    345 }
    346 
    347 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
    348   EnsureValidFrame();
    349   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    350   MCSymbol *Label = getContext().CreateTempSymbol();
    351   EmitLabel(Label);
    352   MachineLocation Dest(Register, Offset);
    353   MachineLocation Source(Register, Offset);
    354   MCCFIInstruction Instruction(Label, Dest, Source);
    355   CurFrame->Instructions.push_back(Instruction);
    356 }
    357 
    358 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
    359   EnsureValidFrame();
    360   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    361   MCSymbol *Label = getContext().CreateTempSymbol();
    362   EmitLabel(Label);
    363   MachineLocation Dest(Register, Offset);
    364   MachineLocation Source(Register, Offset);
    365   MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
    366   CurFrame->Instructions.push_back(Instruction);
    367 }
    368 
    369 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
    370                                     unsigned Encoding) {
    371   EnsureValidFrame();
    372   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    373   CurFrame->Personality = Sym;
    374   CurFrame->PersonalityEncoding = Encoding;
    375 }
    376 
    377 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
    378   EnsureValidFrame();
    379   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    380   CurFrame->Lsda = Sym;
    381   CurFrame->LsdaEncoding = Encoding;
    382 }
    383 
    384 void MCStreamer::EmitCFIRememberState() {
    385   EnsureValidFrame();
    386   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    387   MCSymbol *Label = getContext().CreateTempSymbol();
    388   EmitLabel(Label);
    389   MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label);
    390   CurFrame->Instructions.push_back(Instruction);
    391 }
    392 
    393 void MCStreamer::EmitCFIRestoreState() {
    394   // FIXME: Error if there is no matching cfi_remember_state.
    395   EnsureValidFrame();
    396   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    397   MCSymbol *Label = getContext().CreateTempSymbol();
    398   EmitLabel(Label);
    399   MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label);
    400   CurFrame->Instructions.push_back(Instruction);
    401 }
    402 
    403 void MCStreamer::EmitCFISameValue(int64_t Register) {
    404   EnsureValidFrame();
    405   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
    406   MCSymbol *Label = getContext().CreateTempSymbol();
    407   EmitLabel(Label);
    408   MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register);
    409   CurFrame->Instructions.push_back(Instruction);
    410 }
    411 
    412 void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
    413   W64UnwindInfos.push_back(Frame);
    414   CurrentW64UnwindInfo = W64UnwindInfos.back();
    415 }
    416 
    417 void MCStreamer::EnsureValidW64UnwindInfo() {
    418   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    419   if (!CurFrame || CurFrame->End)
    420     report_fatal_error("No open Win64 EH frame function!");
    421 }
    422 
    423 void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
    424   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    425   if (CurFrame && !CurFrame->End)
    426     report_fatal_error("Starting a function before ending the previous one!");
    427   MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
    428   Frame->Begin = getContext().CreateTempSymbol();
    429   Frame->Function = Symbol;
    430   EmitLabel(Frame->Begin);
    431   setCurrentW64UnwindInfo(Frame);
    432 }
    433 
    434 void MCStreamer::EmitWin64EHEndProc() {
    435   EnsureValidW64UnwindInfo();
    436   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    437   if (CurFrame->ChainedParent)
    438     report_fatal_error("Not all chained regions terminated!");
    439   CurFrame->End = getContext().CreateTempSymbol();
    440   EmitLabel(CurFrame->End);
    441 }
    442 
    443 void MCStreamer::EmitWin64EHStartChained() {
    444   EnsureValidW64UnwindInfo();
    445   MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
    446   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    447   Frame->Begin = getContext().CreateTempSymbol();
    448   Frame->Function = CurFrame->Function;
    449   Frame->ChainedParent = CurFrame;
    450   EmitLabel(Frame->Begin);
    451   setCurrentW64UnwindInfo(Frame);
    452 }
    453 
    454 void MCStreamer::EmitWin64EHEndChained() {
    455   EnsureValidW64UnwindInfo();
    456   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    457   if (!CurFrame->ChainedParent)
    458     report_fatal_error("End of a chained region outside a chained region!");
    459   CurFrame->End = getContext().CreateTempSymbol();
    460   EmitLabel(CurFrame->End);
    461   CurrentW64UnwindInfo = CurFrame->ChainedParent;
    462 }
    463 
    464 void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
    465                                     bool Except) {
    466   EnsureValidW64UnwindInfo();
    467   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    468   if (CurFrame->ChainedParent)
    469     report_fatal_error("Chained unwind areas can't have handlers!");
    470   CurFrame->ExceptionHandler = Sym;
    471   if (!Except && !Unwind)
    472     report_fatal_error("Don't know what kind of handler this is!");
    473   if (Unwind)
    474     CurFrame->HandlesUnwind = true;
    475   if (Except)
    476     CurFrame->HandlesExceptions = true;
    477 }
    478 
    479 void MCStreamer::EmitWin64EHHandlerData() {
    480   EnsureValidW64UnwindInfo();
    481   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    482   if (CurFrame->ChainedParent)
    483     report_fatal_error("Chained unwind areas can't have handlers!");
    484 }
    485 
    486 void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
    487   EnsureValidW64UnwindInfo();
    488   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    489   MCSymbol *Label = getContext().CreateTempSymbol();
    490   MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
    491   EmitLabel(Label);
    492   CurFrame->Instructions.push_back(Inst);
    493 }
    494 
    495 void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
    496   EnsureValidW64UnwindInfo();
    497   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    498   if (CurFrame->LastFrameInst >= 0)
    499     report_fatal_error("Frame register and offset already specified!");
    500   if (Offset & 0x0F)
    501     report_fatal_error("Misaligned frame pointer offset!");
    502   MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, NULL, Register, Offset);
    503   CurFrame->LastFrameInst = CurFrame->Instructions.size();
    504   CurFrame->Instructions.push_back(Inst);
    505 }
    506 
    507 void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
    508   EnsureValidW64UnwindInfo();
    509   if (Size & 7)
    510     report_fatal_error("Misaligned stack allocation!");
    511   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    512   MCSymbol *Label = getContext().CreateTempSymbol();
    513   MCWin64EHInstruction Inst(Label, Size);
    514   EmitLabel(Label);
    515   CurFrame->Instructions.push_back(Inst);
    516 }
    517 
    518 void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
    519   EnsureValidW64UnwindInfo();
    520   if (Offset & 7)
    521     report_fatal_error("Misaligned saved register offset!");
    522   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    523   MCSymbol *Label = getContext().CreateTempSymbol();
    524   MCWin64EHInstruction Inst(
    525      Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
    526                             Label, Register, Offset);
    527   EmitLabel(Label);
    528   CurFrame->Instructions.push_back(Inst);
    529 }
    530 
    531 void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
    532   EnsureValidW64UnwindInfo();
    533   if (Offset & 0x0F)
    534     report_fatal_error("Misaligned saved vector register offset!");
    535   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    536   MCSymbol *Label = getContext().CreateTempSymbol();
    537   MCWin64EHInstruction Inst(
    538     Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
    539                             Label, Register, Offset);
    540   EmitLabel(Label);
    541   CurFrame->Instructions.push_back(Inst);
    542 }
    543 
    544 void MCStreamer::EmitWin64EHPushFrame(bool Code) {
    545   EnsureValidW64UnwindInfo();
    546   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    547   if (CurFrame->Instructions.size() > 0)
    548     report_fatal_error("If present, PushMachFrame must be the first UOP");
    549   MCSymbol *Label = getContext().CreateTempSymbol();
    550   MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
    551   EmitLabel(Label);
    552   CurFrame->Instructions.push_back(Inst);
    553 }
    554 
    555 void MCStreamer::EmitWin64EHEndProlog() {
    556   EnsureValidW64UnwindInfo();
    557   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
    558   CurFrame->PrologEnd = getContext().CreateTempSymbol();
    559   EmitLabel(CurFrame->PrologEnd);
    560 }
    561 
    562 void MCStreamer::EmitFnStart() {
    563   errs() << "Not implemented yet\n";
    564   abort();
    565 }
    566 
    567 void MCStreamer::EmitFnEnd() {
    568   errs() << "Not implemented yet\n";
    569   abort();
    570 }
    571 
    572 void MCStreamer::EmitCantUnwind() {
    573   errs() << "Not implemented yet\n";
    574   abort();
    575 }
    576 
    577 void MCStreamer::EmitHandlerData() {
    578   errs() << "Not implemented yet\n";
    579   abort();
    580 }
    581 
    582 void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
    583   errs() << "Not implemented yet\n";
    584   abort();
    585 }
    586 
    587 void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
    588   errs() << "Not implemented yet\n";
    589   abort();
    590 }
    591 
    592 void MCStreamer::EmitPad(int64_t Offset) {
    593   errs() << "Not implemented yet\n";
    594   abort();
    595 }
    596 
    597 void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
    598   errs() << "Not implemented yet\n";
    599   abort();
    600 }
    601 
    602 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
    603 /// the specified string in the output .s file.  This capability is
    604 /// indicated by the hasRawTextSupport() predicate.
    605 void MCStreamer::EmitRawText(StringRef String) {
    606   errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
    607   " something must not be fully mc'ized\n";
    608   abort();
    609 }
    610 
    611 void MCStreamer::EmitRawText(const Twine &T) {
    612   SmallString<128> Str;
    613   T.toVector(Str);
    614   EmitRawText(Str.str());
    615 }
    616 
    617 void MCStreamer::EmitFrames(bool usingCFI) {
    618   if (!getNumFrameInfos())
    619     return;
    620 
    621   if (EmitEHFrame)
    622     MCDwarfFrameEmitter::Emit(*this, usingCFI, true);
    623 
    624   if (EmitDebugFrame)
    625     MCDwarfFrameEmitter::Emit(*this, usingCFI, false);
    626 }
    627 
    628 void MCStreamer::EmitW64Tables() {
    629   if (!getNumW64UnwindInfos())
    630     return;
    631 
    632   MCWin64EHUnwindEmitter::Emit(*this);
    633 }
    634