lib/MC/MCStreamer.cpp

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