MCStreamer.cpp revision f0a0d578089572be37063bbe37063edb28148159 
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>
22using namespace llvm;
23
24MCStreamer::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
30MCStreamer::~MCStreamer() {
31  for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
32    delete W64UnwindInfos[i];
33}
34
35void 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
47const 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
60const 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
70raw_ostream &MCStreamer::GetCommentOS() {
71  // By default, discard comments.
72  return nulls();
73}
74
75void 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.
89void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
90  assert(Size <= 8 && "Invalid size");
91  assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
92         "Invalid size");
93  char buf[8];
94  const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
95  for (unsigned i = 0; i != Size; ++i) {
96    unsigned index = isLittleEndian ? i : (Size - i - 1);
97    buf[i] = uint8_t(Value >> (index * 8));
98  }
99  EmitBytes(StringRef(buf, Size));
100}
101
102/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
103/// client having to pass in a MCExpr for constant integers.
104void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
105  SmallString<128> Tmp;
106  raw_svector_ostream OSE(Tmp);
107  encodeULEB128(Value, OSE, Padding);
108  EmitBytes(OSE.str());
109}
110
111/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
112/// client having to pass in a MCExpr for constant integers.
113void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
114  SmallString<128> Tmp;
115  raw_svector_ostream OSE(Tmp);
116  encodeSLEB128(Value, OSE);
117  EmitBytes(OSE.str());
118}
119
120void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
121  const MCExpr *ABS = ForceExpAbs(Value);
122  EmitValue(ABS, Size);
123}
124
125
126void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size) {
127  EmitValueImpl(Value, Size);
128}
129
130void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size) {
131  EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
132}
133
134void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
135  report_fatal_error("unsupported directive in streamer");
136}
137
138void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
139  report_fatal_error("unsupported directive in streamer");
140}
141
142/// EmitFill - Emit NumBytes bytes worth of the value specified by
143/// FillValue.  This implements directives such as '.space'.
144void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
145  const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
146  for (uint64_t i = 0, e = NumBytes; i != e; ++i)
147    EmitValue(E, 1);
148}
149
150/// The implementation in this class just redirects to EmitFill.
151void MCStreamer::EmitZeros(uint64_t NumBytes) {
152  EmitFill(NumBytes, 0);
153}
154
155bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
156                                        StringRef Directory,
157                                        StringRef Filename, unsigned CUID) {
158  return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID) == 0;
159}
160
161void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
162                                       unsigned Column, unsigned Flags,
163                                       unsigned Isa,
164                                       unsigned Discriminator,
165                                       StringRef FileName) {
166  getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
167                                  Discriminator);
168}
169
170MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
171  if (FrameInfos.empty())
172    return 0;
173  return &FrameInfos.back();
174}
175
176void MCStreamer::EnsureValidFrame() {
177  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
178  if (!CurFrame || CurFrame->End)
179    report_fatal_error("No open frame");
180}
181
182void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
183                                     MCSymbol *EHSymbol) {
184}
185
186void MCStreamer::EmitLabel(MCSymbol *Symbol) {
187  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
188  assert(getCurrentSection().first && "Cannot emit before setting section!");
189  Symbol->setSection(*getCurrentSection().first);
190  LastSymbol = Symbol;
191}
192
193void MCStreamer::EmitDebugLabel(MCSymbol *Symbol) {
194  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
195  assert(getCurrentSection().first && "Cannot emit before setting section!");
196  Symbol->setSection(*getCurrentSection().first);
197  LastSymbol = Symbol;
198}
199
200void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
201  EnsureValidFrame();
202  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
203  CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
204}
205
206void MCStreamer::EmitCFISections(bool EH, bool Debug) {
207  assert(EH || Debug);
208  EmitEHFrame = EH;
209  EmitDebugFrame = Debug;
210}
211
212void MCStreamer::EmitCFIStartProc() {
213  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
214  if (CurFrame && !CurFrame->End)
215    report_fatal_error("Starting a frame before finishing the previous one!");
216
217  MCDwarfFrameInfo Frame;
218  EmitCFIStartProcImpl(Frame);
219
220  FrameInfos.push_back(Frame);
221}
222
223void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
224}
225
226void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
227  Frame.Function = LastSymbol;
228  // If the function is externally visible, we need to create a local
229  // symbol to avoid relocations.
230  StringRef Prefix = getContext().getAsmInfo()->getPrivateGlobalPrefix();
231  if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
232    Frame.Begin = LastSymbol;
233  } else {
234    Frame.Begin = getContext().CreateTempSymbol();
235    EmitLabel(Frame.Begin);
236  }
237}
238
239void MCStreamer::EmitCFIEndProc() {
240  EnsureValidFrame();
241  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
242  EmitCFIEndProcImpl(*CurFrame);
243}
244
245void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
246}
247
248void MCStreamer::RecordProcEnd(MCDwarfFrameInfo &Frame) {
249  Frame.End = getContext().CreateTempSymbol();
250  EmitLabel(Frame.End);
251}
252
253MCSymbol *MCStreamer::EmitCFICommon() {
254  EnsureValidFrame();
255  MCSymbol *Label = getContext().CreateTempSymbol();
256  EmitLabel(Label);
257  return Label;
258}
259
260void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
261  MCSymbol *Label = EmitCFICommon();
262  MCCFIInstruction Instruction =
263    MCCFIInstruction::createDefCfa(Label, Register, Offset);
264  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
265  CurFrame->Instructions.push_back(Instruction);
266}
267
268void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
269  MCSymbol *Label = EmitCFICommon();
270  MCCFIInstruction Instruction =
271    MCCFIInstruction::createDefCfaOffset(Label, Offset);
272  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
273  CurFrame->Instructions.push_back(Instruction);
274}
275
276void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
277  MCSymbol *Label = EmitCFICommon();
278  MCCFIInstruction Instruction =
279    MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
280  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
281  CurFrame->Instructions.push_back(Instruction);
282}
283
284void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
285  MCSymbol *Label = EmitCFICommon();
286  MCCFIInstruction Instruction =
287    MCCFIInstruction::createDefCfaRegister(Label, Register);
288  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
289  CurFrame->Instructions.push_back(Instruction);
290}
291
292void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
293  MCSymbol *Label = EmitCFICommon();
294  MCCFIInstruction Instruction =
295    MCCFIInstruction::createOffset(Label, Register, Offset);
296  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
297  CurFrame->Instructions.push_back(Instruction);
298}
299
300void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
301  MCSymbol *Label = EmitCFICommon();
302  MCCFIInstruction Instruction =
303    MCCFIInstruction::createRelOffset(Label, Register, Offset);
304  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
305  CurFrame->Instructions.push_back(Instruction);
306}
307
308void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
309                                    unsigned Encoding) {
310  EnsureValidFrame();
311  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
312  CurFrame->Personality = Sym;
313  CurFrame->PersonalityEncoding = Encoding;
314}
315
316void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
317  EnsureValidFrame();
318  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
319  CurFrame->Lsda = Sym;
320  CurFrame->LsdaEncoding = Encoding;
321}
322
323void MCStreamer::EmitCFIRememberState() {
324  MCSymbol *Label = EmitCFICommon();
325  MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
326  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
327  CurFrame->Instructions.push_back(Instruction);
328}
329
330void MCStreamer::EmitCFIRestoreState() {
331  // FIXME: Error if there is no matching cfi_remember_state.
332  MCSymbol *Label = EmitCFICommon();
333  MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
334  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
335  CurFrame->Instructions.push_back(Instruction);
336}
337
338void MCStreamer::EmitCFISameValue(int64_t Register) {
339  MCSymbol *Label = EmitCFICommon();
340  MCCFIInstruction Instruction =
341    MCCFIInstruction::createSameValue(Label, Register);
342  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
343  CurFrame->Instructions.push_back(Instruction);
344}
345
346void MCStreamer::EmitCFIRestore(int64_t Register) {
347  MCSymbol *Label = EmitCFICommon();
348  MCCFIInstruction Instruction =
349    MCCFIInstruction::createRestore(Label, Register);
350  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
351  CurFrame->Instructions.push_back(Instruction);
352}
353
354void MCStreamer::EmitCFIEscape(StringRef Values) {
355  MCSymbol *Label = EmitCFICommon();
356  MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
357  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
358  CurFrame->Instructions.push_back(Instruction);
359}
360
361void MCStreamer::EmitCFISignalFrame() {
362  EnsureValidFrame();
363  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
364  CurFrame->IsSignalFrame = true;
365}
366
367void MCStreamer::EmitCFIUndefined(int64_t Register) {
368  MCSymbol *Label = EmitCFICommon();
369  MCCFIInstruction Instruction =
370    MCCFIInstruction::createUndefined(Label, Register);
371  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
372  CurFrame->Instructions.push_back(Instruction);
373}
374
375void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
376  MCSymbol *Label = EmitCFICommon();
377  MCCFIInstruction Instruction =
378    MCCFIInstruction::createRegister(Label, Register1, Register2);
379  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
380  CurFrame->Instructions.push_back(Instruction);
381}
382
383void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
384  W64UnwindInfos.push_back(Frame);
385  CurrentW64UnwindInfo = W64UnwindInfos.back();
386}
387
388void MCStreamer::EnsureValidW64UnwindInfo() {
389  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
390  if (!CurFrame || CurFrame->End)
391    report_fatal_error("No open Win64 EH frame function!");
392}
393
394void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
395  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
396  if (CurFrame && !CurFrame->End)
397    report_fatal_error("Starting a function before ending the previous one!");
398  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
399  Frame->Begin = getContext().CreateTempSymbol();
400  Frame->Function = Symbol;
401  EmitLabel(Frame->Begin);
402  setCurrentW64UnwindInfo(Frame);
403}
404
405void MCStreamer::EmitWin64EHEndProc() {
406  EnsureValidW64UnwindInfo();
407  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
408  if (CurFrame->ChainedParent)
409    report_fatal_error("Not all chained regions terminated!");
410  CurFrame->End = getContext().CreateTempSymbol();
411  EmitLabel(CurFrame->End);
412}
413
414void MCStreamer::EmitWin64EHStartChained() {
415  EnsureValidW64UnwindInfo();
416  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
417  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
418  Frame->Begin = getContext().CreateTempSymbol();
419  Frame->Function = CurFrame->Function;
420  Frame->ChainedParent = CurFrame;
421  EmitLabel(Frame->Begin);
422  setCurrentW64UnwindInfo(Frame);
423}
424
425void MCStreamer::EmitWin64EHEndChained() {
426  EnsureValidW64UnwindInfo();
427  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
428  if (!CurFrame->ChainedParent)
429    report_fatal_error("End of a chained region outside a chained region!");
430  CurFrame->End = getContext().CreateTempSymbol();
431  EmitLabel(CurFrame->End);
432  CurrentW64UnwindInfo = CurFrame->ChainedParent;
433}
434
435void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
436                                    bool Except) {
437  EnsureValidW64UnwindInfo();
438  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
439  if (CurFrame->ChainedParent)
440    report_fatal_error("Chained unwind areas can't have handlers!");
441  CurFrame->ExceptionHandler = Sym;
442  if (!Except && !Unwind)
443    report_fatal_error("Don't know what kind of handler this is!");
444  if (Unwind)
445    CurFrame->HandlesUnwind = true;
446  if (Except)
447    CurFrame->HandlesExceptions = true;
448}
449
450void MCStreamer::EmitWin64EHHandlerData() {
451  EnsureValidW64UnwindInfo();
452  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
453  if (CurFrame->ChainedParent)
454    report_fatal_error("Chained unwind areas can't have handlers!");
455}
456
457void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
458  EnsureValidW64UnwindInfo();
459  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
460  MCSymbol *Label = getContext().CreateTempSymbol();
461  MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
462  EmitLabel(Label);
463  CurFrame->Instructions.push_back(Inst);
464}
465
466void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
467  EnsureValidW64UnwindInfo();
468  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
469  if (CurFrame->LastFrameInst >= 0)
470    report_fatal_error("Frame register and offset already specified!");
471  if (Offset & 0x0F)
472    report_fatal_error("Misaligned frame pointer offset!");
473  MCSymbol *Label = getContext().CreateTempSymbol();
474  MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, Label, Register, Offset);
475  EmitLabel(Label);
476  CurFrame->LastFrameInst = CurFrame->Instructions.size();
477  CurFrame->Instructions.push_back(Inst);
478}
479
480void 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
491void 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
504void 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
517void 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
528void MCStreamer::EmitWin64EHEndProlog() {
529  EnsureValidW64UnwindInfo();
530  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
531  CurFrame->PrologEnd = getContext().CreateTempSymbol();
532  EmitLabel(CurFrame->PrologEnd);
533}
534
535void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
536  llvm_unreachable("This file format doesn't support this directive");
537}
538
539void MCStreamer::EmitFnStart() {
540  errs() << "Not implemented yet\n";
541  abort();
542}
543
544void MCStreamer::EmitFnEnd() {
545  errs() << "Not implemented yet\n";
546  abort();
547}
548
549void MCStreamer::EmitCantUnwind() {
550  errs() << "Not implemented yet\n";
551  abort();
552}
553
554void MCStreamer::EmitHandlerData() {
555  errs() << "Not implemented yet\n";
556  abort();
557}
558
559void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
560  errs() << "Not implemented yet\n";
561  abort();
562}
563
564void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
565  errs() << "Not implemented yet\n";
566  abort();
567}
568
569void MCStreamer::EmitPad(int64_t Offset) {
570  errs() << "Not implemented yet\n";
571  abort();
572}
573
574void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
575  errs() << "Not implemented yet\n";
576  abort();
577}
578
579void 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.
586void 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
592void MCStreamer::EmitRawText(const Twine &T) {
593  SmallString<128> Str;
594  T.toVector(Str);
595  EmitRawText(Str.str());
596}
597
598void 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
609void MCStreamer::EmitW64Tables() {
610  if (!getNumW64UnwindInfos())
611    return;
612
613  MCWin64EHUnwindEmitter::Emit(*this);
614}
615
616void MCStreamer::Finish() {
617  if (!FrameInfos.empty() && !FrameInfos.back().End)
618    report_fatal_error("Unfinished frame!");
619
620  FinishImpl();
621}
622
623MCSymbolData &MCStreamer::getOrCreateSymbolData(MCSymbol *Symbol) {
624  report_fatal_error("Not supported!");
625  return *(static_cast<MCSymbolData*>(0));
626}
627