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/MCStreamer.h"
11 #include "llvm/ADT/SmallString.h"
12 #include "llvm/ADT/Twine.h"
13 #include "llvm/MC/MCAsmInfo.h"
14 #include "llvm/MC/MCContext.h"
15 #include "llvm/MC/MCExpr.h"
16 #include "llvm/MC/MCObjectWriter.h"
17 #include "llvm/MC/MCSymbol.h"
18 #include "llvm/Support/ErrorHandling.h"
19 #include "llvm/Support/LEB128.h"
20 #include "llvm/Support/raw_ostream.h"
21 #include <cstdlib>
22 using namespace llvm;
23 
24 MCStreamer::MCStreamer(StreamerKind Kind, MCContext &Ctx)
25     : Kind(Kind), Context(Ctx), EmitEHFrame(true), EmitDebugFrame(false),
26       CurrentW64UnwindInfo(0), LastSymbol(0), AutoInitSections(false) {
27   SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
28 }
29 
30 MCStreamer::~MCStreamer() {
31   for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
32     delete W64UnwindInfos[i];
33 }
34 
35 void MCStreamer::reset() {
36   for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
37     delete W64UnwindInfos[i];
38   W64UnwindInfos.clear();
39   EmitEHFrame = true;
40   EmitDebugFrame = false;
41   CurrentW64UnwindInfo = 0;
42   LastSymbol = 0;
43   SectionStack.clear();
44   SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
45 }
46 
47 const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
48                                           const MCSymbol *A,
49                                           const MCSymbol *B) {
50   MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
51   const MCExpr *ARef =
52     MCSymbolRefExpr::Create(A, Variant, Context);
53   const MCExpr *BRef =
54     MCSymbolRefExpr::Create(B, Variant, Context);
55   const MCExpr *AddrDelta =
56     MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
57   return AddrDelta;
58 }
59 
60 const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
61   if (Context.getAsmInfo().hasAggressiveSymbolFolding() ||
62       isa<MCSymbolRefExpr>(Expr))
63     return Expr;
64 
65   MCSymbol *ABS = Context.CreateTempSymbol();
66   EmitAssignment(ABS, Expr);
67   return MCSymbolRefExpr::Create(ABS, Context);
68 }
69 
70 raw_ostream &MCStreamer::GetCommentOS() {
71   // By default, discard comments.
72   return nulls();
73 }
74 
75 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
76                                       const MCSymbol *Label, int PointerSize) {
77   // emit the sequence to set the address
78   EmitIntValue(dwarf::DW_LNS_extended_op, 1);
79   EmitULEB128IntValue(PointerSize + 1);
80   EmitIntValue(dwarf::DW_LNE_set_address, 1);
81   EmitSymbolValue(Label, PointerSize);
82 
83   // emit the sequence for the LineDelta (from 1) and a zero address delta.
84   MCDwarfLineAddr::Emit(this, LineDelta, 0);
85 }
86 
87 /// EmitIntValue - Special case of EmitValue that avoids the client having to
88 /// pass in a MCExpr for constant integers.
89 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
90                               unsigned AddrSpace) {
91   assert(Size <= 8 && "Invalid size");
92   assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
93          "Invalid size");
94   char buf[8];
95   const bool isLittleEndian = Context.getAsmInfo().isLittleEndian();
96   for (unsigned i = 0; i != Size; ++i) {
97     unsigned index = isLittleEndian ? i : (Size - i - 1);
98     buf[i] = uint8_t(Value >> (index * 8));
99   }
100   EmitBytes(StringRef(buf, Size), AddrSpace);
101 }
102 
103 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
104 /// client having to pass in a MCExpr for constant integers.
105 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding,
106                                      unsigned AddrSpace) {
107   SmallString<128> Tmp;
108   raw_svector_ostream OSE(Tmp);
109   encodeULEB128(Value, OSE, Padding);
110   EmitBytes(OSE.str(), AddrSpace);
111 }
112 
113 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
114 /// client having to pass in a MCExpr for constant integers.
115 void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
116   SmallString<128> Tmp;
117   raw_svector_ostream OSE(Tmp);
118   encodeSLEB128(Value, OSE);
119   EmitBytes(OSE.str(), AddrSpace);
120 }
121 
122 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
123                               unsigned AddrSpace) {
124   const MCExpr *ABS = ForceExpAbs(Value);
125   EmitValue(ABS, Size, AddrSpace);
126 }
127 
128 
129 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
130                            unsigned AddrSpace) {
131   EmitValueImpl(Value, Size, AddrSpace);
132 }
133 
134 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
135                                   unsigned AddrSpace) {
136   EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size,
137                 AddrSpace);
138 }
139 
140 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
141   report_fatal_error("unsupported directive in streamer");
142 }
143 
144 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
145   report_fatal_error("unsupported directive in streamer");
146 }
147 
148 /// EmitFill - Emit NumBytes bytes worth of the value specified by
149 /// FillValue.  This implements directives such as '.space'.
150 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
151                           unsigned AddrSpace) {
152   const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
153   for (uint64_t i = 0, e = NumBytes; i != e; ++i)
154     EmitValue(E, 1, AddrSpace);
155 }
156 
157 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
158                                         StringRef Directory,
159                                         StringRef Filename, unsigned CUID) {
160   return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID) == 0;
161 }
162 
163 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
164                                        unsigned Column, unsigned Flags,
165                                        unsigned Isa,
166                                        unsigned Discriminator,
167                                        StringRef FileName) {
168   getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
169                                   Discriminator);
170 }
171 
172 MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
173   if (FrameInfos.empty())
174     return 0;
175   return &FrameInfos.back();
176 }
177 
178 void MCStreamer::EnsureValidFrame() {
179   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
180   if (!CurFrame || CurFrame->End)
181     report_fatal_error("No open frame");
182 }
183 
184 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
185                                      MCSymbol *EHSymbol) {
186 }
187 
188 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
189   assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
190   assert(getCurrentSection().first && "Cannot emit before setting section!");
191   Symbol->setSection(*getCurrentSection().first);
192   LastSymbol = Symbol;
193 }
194 
195 void MCStreamer::EmitDebugLabel(MCSymbol *Symbol) {
196   assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
197   assert(getCurrentSection().first && "Cannot emit before setting section!");
198   Symbol->setSection(*getCurrentSection().first);
199   LastSymbol = Symbol;
200 }
201 
202 void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
203   EnsureValidFrame();
204   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
205   CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
206 }
207 
208 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
209   assert(EH || Debug);
210   EmitEHFrame = EH;
211   EmitDebugFrame = Debug;
212 }
213 
214 void MCStreamer::EmitCFIStartProc() {
215   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
216   if (CurFrame && !CurFrame->End)
217     report_fatal_error("Starting a frame before finishing the previous one!");
218 
219   MCDwarfFrameInfo Frame;
220   EmitCFIStartProcImpl(Frame);
221 
222   FrameInfos.push_back(Frame);
223 }
224 
225 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
226 }
227 
228 void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
229   Frame.Function = LastSymbol;
230   // If the function is externally visible, we need to create a local
231   // symbol to avoid relocations.
232   StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
233   if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
234     Frame.Begin = LastSymbol;
235   } else {
236     Frame.Begin = getContext().CreateTempSymbol();
237     EmitLabel(Frame.Begin);
238   }
239 }
240 
241 void MCStreamer::EmitCFIEndProc() {
242   EnsureValidFrame();
243   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
244   EmitCFIEndProcImpl(*CurFrame);
245 }
246 
247 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
248 }
249 
250 void MCStreamer::RecordProcEnd(MCDwarfFrameInfo &Frame) {
251   Frame.End = getContext().CreateTempSymbol();
252   EmitLabel(Frame.End);
253 }
254 
255 MCSymbol *MCStreamer::EmitCFICommon() {
256   EnsureValidFrame();
257   MCSymbol *Label = getContext().CreateTempSymbol();
258   EmitLabel(Label);
259   return Label;
260 }
261 
262 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
263   MCSymbol *Label = EmitCFICommon();
264   MCCFIInstruction Instruction =
265     MCCFIInstruction::createDefCfa(Label, Register, Offset);
266   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
267   CurFrame->Instructions.push_back(Instruction);
268 }
269 
270 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
271   MCSymbol *Label = EmitCFICommon();
272   MCCFIInstruction Instruction =
273     MCCFIInstruction::createDefCfaOffset(Label, Offset);
274   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
275   CurFrame->Instructions.push_back(Instruction);
276 }
277 
278 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
279   MCSymbol *Label = EmitCFICommon();
280   MCCFIInstruction Instruction =
281     MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
282   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
283   CurFrame->Instructions.push_back(Instruction);
284 }
285 
286 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
287   MCSymbol *Label = EmitCFICommon();
288   MCCFIInstruction Instruction =
289     MCCFIInstruction::createDefCfaRegister(Label, Register);
290   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
291   CurFrame->Instructions.push_back(Instruction);
292 }
293 
294 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
295   MCSymbol *Label = EmitCFICommon();
296   MCCFIInstruction Instruction =
297     MCCFIInstruction::createOffset(Label, Register, Offset);
298   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
299   CurFrame->Instructions.push_back(Instruction);
300 }
301 
302 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
303   MCSymbol *Label = EmitCFICommon();
304   MCCFIInstruction Instruction =
305     MCCFIInstruction::createRelOffset(Label, Register, Offset);
306   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
307   CurFrame->Instructions.push_back(Instruction);
308 }
309 
310 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
311                                     unsigned Encoding) {
312   EnsureValidFrame();
313   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
314   CurFrame->Personality = Sym;
315   CurFrame->PersonalityEncoding = Encoding;
316 }
317 
318 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
319   EnsureValidFrame();
320   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
321   CurFrame->Lsda = Sym;
322   CurFrame->LsdaEncoding = Encoding;
323 }
324 
325 void MCStreamer::EmitCFIRememberState() {
326   MCSymbol *Label = EmitCFICommon();
327   MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
328   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
329   CurFrame->Instructions.push_back(Instruction);
330 }
331 
332 void MCStreamer::EmitCFIRestoreState() {
333   // FIXME: Error if there is no matching cfi_remember_state.
334   MCSymbol *Label = EmitCFICommon();
335   MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
336   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
337   CurFrame->Instructions.push_back(Instruction);
338 }
339 
340 void MCStreamer::EmitCFISameValue(int64_t Register) {
341   MCSymbol *Label = EmitCFICommon();
342   MCCFIInstruction Instruction =
343     MCCFIInstruction::createSameValue(Label, Register);
344   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
345   CurFrame->Instructions.push_back(Instruction);
346 }
347 
348 void MCStreamer::EmitCFIRestore(int64_t Register) {
349   MCSymbol *Label = EmitCFICommon();
350   MCCFIInstruction Instruction =
351     MCCFIInstruction::createRestore(Label, Register);
352   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
353   CurFrame->Instructions.push_back(Instruction);
354 }
355 
356 void MCStreamer::EmitCFIEscape(StringRef Values) {
357   MCSymbol *Label = EmitCFICommon();
358   MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
359   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
360   CurFrame->Instructions.push_back(Instruction);
361 }
362 
363 void MCStreamer::EmitCFISignalFrame() {
364   EnsureValidFrame();
365   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
366   CurFrame->IsSignalFrame = true;
367 }
368 
369 void MCStreamer::EmitCFIUndefined(int64_t Register) {
370   MCSymbol *Label = EmitCFICommon();
371   MCCFIInstruction Instruction =
372     MCCFIInstruction::createUndefined(Label, Register);
373   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
374   CurFrame->Instructions.push_back(Instruction);
375 }
376 
377 void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
378   MCSymbol *Label = EmitCFICommon();
379   MCCFIInstruction Instruction =
380     MCCFIInstruction::createRegister(Label, Register1, Register2);
381   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
382   CurFrame->Instructions.push_back(Instruction);
383 }
384 
385 void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
386   W64UnwindInfos.push_back(Frame);
387   CurrentW64UnwindInfo = W64UnwindInfos.back();
388 }
389 
390 void MCStreamer::EnsureValidW64UnwindInfo() {
391   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
392   if (!CurFrame || CurFrame->End)
393     report_fatal_error("No open Win64 EH frame function!");
394 }
395 
396 void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
397   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
398   if (CurFrame && !CurFrame->End)
399     report_fatal_error("Starting a function before ending the previous one!");
400   MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
401   Frame->Begin = getContext().CreateTempSymbol();
402   Frame->Function = Symbol;
403   EmitLabel(Frame->Begin);
404   setCurrentW64UnwindInfo(Frame);
405 }
406 
407 void MCStreamer::EmitWin64EHEndProc() {
408   EnsureValidW64UnwindInfo();
409   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
410   if (CurFrame->ChainedParent)
411     report_fatal_error("Not all chained regions terminated!");
412   CurFrame->End = getContext().CreateTempSymbol();
413   EmitLabel(CurFrame->End);
414 }
415 
416 void MCStreamer::EmitWin64EHStartChained() {
417   EnsureValidW64UnwindInfo();
418   MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
419   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
420   Frame->Begin = getContext().CreateTempSymbol();
421   Frame->Function = CurFrame->Function;
422   Frame->ChainedParent = CurFrame;
423   EmitLabel(Frame->Begin);
424   setCurrentW64UnwindInfo(Frame);
425 }
426 
427 void MCStreamer::EmitWin64EHEndChained() {
428   EnsureValidW64UnwindInfo();
429   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
430   if (!CurFrame->ChainedParent)
431     report_fatal_error("End of a chained region outside a chained region!");
432   CurFrame->End = getContext().CreateTempSymbol();
433   EmitLabel(CurFrame->End);
434   CurrentW64UnwindInfo = CurFrame->ChainedParent;
435 }
436 
437 void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
438                                     bool Except) {
439   EnsureValidW64UnwindInfo();
440   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
441   if (CurFrame->ChainedParent)
442     report_fatal_error("Chained unwind areas can't have handlers!");
443   CurFrame->ExceptionHandler = Sym;
444   if (!Except && !Unwind)
445     report_fatal_error("Don't know what kind of handler this is!");
446   if (Unwind)
447     CurFrame->HandlesUnwind = true;
448   if (Except)
449     CurFrame->HandlesExceptions = true;
450 }
451 
452 void MCStreamer::EmitWin64EHHandlerData() {
453   EnsureValidW64UnwindInfo();
454   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
455   if (CurFrame->ChainedParent)
456     report_fatal_error("Chained unwind areas can't have handlers!");
457 }
458 
459 void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
460   EnsureValidW64UnwindInfo();
461   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
462   MCSymbol *Label = getContext().CreateTempSymbol();
463   MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
464   EmitLabel(Label);
465   CurFrame->Instructions.push_back(Inst);
466 }
467 
468 void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
469   EnsureValidW64UnwindInfo();
470   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
471   if (CurFrame->LastFrameInst >= 0)
472     report_fatal_error("Frame register and offset already specified!");
473   if (Offset & 0x0F)
474     report_fatal_error("Misaligned frame pointer offset!");
475   MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, 0, Register, Offset);
476   CurFrame->LastFrameInst = CurFrame->Instructions.size();
477   CurFrame->Instructions.push_back(Inst);
478 }
479 
480 void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
481   EnsureValidW64UnwindInfo();
482   if (Size & 7)
483     report_fatal_error("Misaligned stack allocation!");
484   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
485   MCSymbol *Label = getContext().CreateTempSymbol();
486   MCWin64EHInstruction Inst(Label, Size);
487   EmitLabel(Label);
488   CurFrame->Instructions.push_back(Inst);
489 }
490 
491 void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
492   EnsureValidW64UnwindInfo();
493   if (Offset & 7)
494     report_fatal_error("Misaligned saved register offset!");
495   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
496   MCSymbol *Label = getContext().CreateTempSymbol();
497   MCWin64EHInstruction Inst(
498      Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
499                             Label, Register, Offset);
500   EmitLabel(Label);
501   CurFrame->Instructions.push_back(Inst);
502 }
503 
504 void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
505   EnsureValidW64UnwindInfo();
506   if (Offset & 0x0F)
507     report_fatal_error("Misaligned saved vector register offset!");
508   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
509   MCSymbol *Label = getContext().CreateTempSymbol();
510   MCWin64EHInstruction Inst(
511     Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
512                             Label, Register, Offset);
513   EmitLabel(Label);
514   CurFrame->Instructions.push_back(Inst);
515 }
516 
517 void MCStreamer::EmitWin64EHPushFrame(bool Code) {
518   EnsureValidW64UnwindInfo();
519   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
520   if (CurFrame->Instructions.size() > 0)
521     report_fatal_error("If present, PushMachFrame must be the first UOP");
522   MCSymbol *Label = getContext().CreateTempSymbol();
523   MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
524   EmitLabel(Label);
525   CurFrame->Instructions.push_back(Inst);
526 }
527 
528 void MCStreamer::EmitWin64EHEndProlog() {
529   EnsureValidW64UnwindInfo();
530   MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
531   CurFrame->PrologEnd = getContext().CreateTempSymbol();
532   EmitLabel(CurFrame->PrologEnd);
533 }
534 
535 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
536   llvm_unreachable("This file format doesn't support this directive");
537 }
538 
539 void MCStreamer::EmitFnStart() {
540   errs() << "Not implemented yet\n";
541   abort();
542 }
543 
544 void MCStreamer::EmitFnEnd() {
545   errs() << "Not implemented yet\n";
546   abort();
547 }
548 
549 void MCStreamer::EmitCantUnwind() {
550   errs() << "Not implemented yet\n";
551   abort();
552 }
553 
554 void MCStreamer::EmitHandlerData() {
555   errs() << "Not implemented yet\n";
556   abort();
557 }
558 
559 void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
560   errs() << "Not implemented yet\n";
561   abort();
562 }
563 
564 void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
565   errs() << "Not implemented yet\n";
566   abort();
567 }
568 
569 void MCStreamer::EmitPad(int64_t Offset) {
570   errs() << "Not implemented yet\n";
571   abort();
572 }
573 
574 void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
575   errs() << "Not implemented yet\n";
576   abort();
577 }
578 
579 void MCStreamer::EmitTCEntry(const MCSymbol &S) {
580   llvm_unreachable("Unsupported method");
581 }
582 
583 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
584 /// the specified string in the output .s file.  This capability is
585 /// indicated by the hasRawTextSupport() predicate.
586 void MCStreamer::EmitRawText(StringRef String) {
587   errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
588   " something must not be fully mc'ized\n";
589   abort();
590 }
591 
592 void MCStreamer::EmitRawText(const Twine &T) {
593   SmallString<128> Str;
594   T.toVector(Str);
595   EmitRawText(Str.str());
596 }
597 
598 void MCStreamer::EmitFrames(bool usingCFI) {
599   if (!getNumFrameInfos())
600     return;
601 
602   if (EmitEHFrame)
603     MCDwarfFrameEmitter::Emit(*this, usingCFI, true);
604 
605   if (EmitDebugFrame)
606     MCDwarfFrameEmitter::Emit(*this, usingCFI, false);
607 }
608 
609 void MCStreamer::EmitW64Tables() {
610   if (!getNumW64UnwindInfos())
611     return;
612 
613   MCWin64EHUnwindEmitter::Emit(*this);
614 }
615 
616 void MCStreamer::Finish() {
617   if (!FrameInfos.empty() && !FrameInfos.back().End)
618     report_fatal_error("Unfinished frame!");
619 
620   FinishImpl();
621 }
622 
623 MCSymbolData &MCStreamer::getOrCreateSymbolData(MCSymbol *Symbol) {
624   report_fatal_error("Not supported!");
625   return *(static_cast<MCSymbolData*>(0));
626 }
627