MCStreamer.cpp revision 77afbdce53aa740777486b0cc4e9df151ae65468 
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  const MCSection *section = NULL;
28  SectionStack.push_back(std::make_pair(section, section));
29}
30
31MCStreamer::~MCStreamer() {
32  for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
33    delete W64UnwindInfos[i];
34}
35
36void MCStreamer::reset() {
37  for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
38    delete W64UnwindInfos[i];
39  EmitEHFrame = true;
40  EmitDebugFrame = false;
41  CurrentW64UnwindInfo = 0;
42  LastSymbol = 0;
43  const MCSection *section = NULL;
44  SectionStack.clear();
45  SectionStack.push_back(std::make_pair(section, section));
46}
47
48const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
49                                          const MCSymbol *A,
50                                          const MCSymbol *B) {
51  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
52  const MCExpr *ARef =
53    MCSymbolRefExpr::Create(A, Variant, Context);
54  const MCExpr *BRef =
55    MCSymbolRefExpr::Create(B, Variant, Context);
56  const MCExpr *AddrDelta =
57    MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
58  return AddrDelta;
59}
60
61const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
62  if (Context.getAsmInfo().hasAggressiveSymbolFolding() ||
63      isa<MCSymbolRefExpr>(Expr))
64    return Expr;
65
66  MCSymbol *ABS = Context.CreateTempSymbol();
67  EmitAssignment(ABS, Expr);
68  return MCSymbolRefExpr::Create(ABS, Context);
69}
70
71raw_ostream &MCStreamer::GetCommentOS() {
72  // By default, discard comments.
73  return nulls();
74}
75
76void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
77                                      const MCSymbol *Label, int PointerSize) {
78  // emit the sequence to set the address
79  EmitIntValue(dwarf::DW_LNS_extended_op, 1);
80  EmitULEB128IntValue(PointerSize + 1);
81  EmitIntValue(dwarf::DW_LNE_set_address, 1);
82  EmitSymbolValue(Label, PointerSize);
83
84  // emit the sequence for the LineDelta (from 1) and a zero address delta.
85  MCDwarfLineAddr::Emit(this, LineDelta, 0);
86}
87
88/// EmitIntValue - Special case of EmitValue that avoids the client having to
89/// pass in a MCExpr for constant integers.
90void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
91                              unsigned AddrSpace) {
92  assert(Size <= 8 && "Invalid size");
93  assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
94         "Invalid size");
95  char buf[8];
96  const bool isLittleEndian = Context.getAsmInfo().isLittleEndian();
97  for (unsigned i = 0; i != Size; ++i) {
98    unsigned index = isLittleEndian ? i : (Size - i - 1);
99    buf[i] = uint8_t(Value >> (index * 8));
100  }
101  EmitBytes(StringRef(buf, Size), AddrSpace);
102}
103
104/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
105/// client having to pass in a MCExpr for constant integers.
106void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding,
107                                     unsigned AddrSpace) {
108  SmallString<128> Tmp;
109  raw_svector_ostream OSE(Tmp);
110  encodeULEB128(Value, OSE, Padding);
111  EmitBytes(OSE.str(), AddrSpace);
112}
113
114/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
115/// client having to pass in a MCExpr for constant integers.
116void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
117  SmallString<128> Tmp;
118  raw_svector_ostream OSE(Tmp);
119  encodeSLEB128(Value, OSE);
120  EmitBytes(OSE.str(), AddrSpace);
121}
122
123void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
124                              unsigned AddrSpace) {
125  const MCExpr *ABS = ForceExpAbs(Value);
126  EmitValue(ABS, Size, AddrSpace);
127}
128
129
130void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
131                           unsigned AddrSpace) {
132  EmitValueImpl(Value, Size, AddrSpace);
133}
134
135void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
136                                  unsigned AddrSpace) {
137  EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size,
138                AddrSpace);
139}
140
141void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
142  report_fatal_error("unsupported directive in streamer");
143}
144
145void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
146  report_fatal_error("unsupported directive in streamer");
147}
148
149/// EmitFill - Emit NumBytes bytes worth of the value specified by
150/// FillValue.  This implements directives such as '.space'.
151void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
152                          unsigned AddrSpace) {
153  const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
154  for (uint64_t i = 0, e = NumBytes; i != e; ++i)
155    EmitValue(E, 1, AddrSpace);
156}
157
158bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
159                                        StringRef Directory,
160                                        StringRef Filename) {
161  return getContext().GetDwarfFile(Directory, Filename, FileNo) == 0;
162}
163
164void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
165                                       unsigned Column, unsigned Flags,
166                                       unsigned Isa,
167                                       unsigned Discriminator,
168                                       StringRef FileName) {
169  getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
170                                  Discriminator);
171}
172
173MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
174  if (FrameInfos.empty())
175    return NULL;
176  return &FrameInfos.back();
177}
178
179void MCStreamer::EnsureValidFrame() {
180  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
181  if (!CurFrame || CurFrame->End)
182    report_fatal_error("No open frame");
183}
184
185void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
186                                     MCSymbol *EHSymbol) {
187}
188
189void MCStreamer::EmitLabel(MCSymbol *Symbol) {
190  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
191  assert(getCurrentSection() && "Cannot emit before setting section!");
192  Symbol->setSection(*getCurrentSection());
193  LastSymbol = Symbol;
194}
195
196void MCStreamer::EmitDebugLabel(MCSymbol *Symbol) {
197  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
198  assert(getCurrentSection() && "Cannot emit before setting section!");
199  Symbol->setSection(*getCurrentSection());
200  LastSymbol = Symbol;
201}
202
203void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
204  EnsureValidFrame();
205  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
206  CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
207}
208
209void MCStreamer::EmitCFISections(bool EH, bool Debug) {
210  assert(EH || Debug);
211  EmitEHFrame = EH;
212  EmitDebugFrame = Debug;
213}
214
215void MCStreamer::EmitCFIStartProc() {
216  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
217  if (CurFrame && !CurFrame->End)
218    report_fatal_error("Starting a frame before finishing the previous one!");
219
220  MCDwarfFrameInfo Frame;
221  EmitCFIStartProcImpl(Frame);
222
223  FrameInfos.push_back(Frame);
224}
225
226void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
227}
228
229void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
230  Frame.Function = LastSymbol;
231  // If the function is externally visible, we need to create a local
232  // symbol to avoid relocations.
233  StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
234  if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
235    Frame.Begin = LastSymbol;
236  } else {
237    Frame.Begin = getContext().CreateTempSymbol();
238    EmitLabel(Frame.Begin);
239  }
240}
241
242void MCStreamer::EmitCFIEndProc() {
243  EnsureValidFrame();
244  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
245  EmitCFIEndProcImpl(*CurFrame);
246}
247
248void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
249}
250
251void MCStreamer::RecordProcEnd(MCDwarfFrameInfo &Frame) {
252  Frame.End = getContext().CreateTempSymbol();
253  EmitLabel(Frame.End);
254}
255
256MCSymbol *MCStreamer::EmitCFICommon() {
257  EnsureValidFrame();
258  MCSymbol *Label = getContext().CreateTempSymbol();
259  EmitLabel(Label);
260  return Label;
261}
262
263void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
264  MCSymbol *Label = EmitCFICommon();
265  MCCFIInstruction Instruction =
266    MCCFIInstruction::createDefCfa(Label, Register, Offset);
267  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
268  CurFrame->Instructions.push_back(Instruction);
269}
270
271void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
272  MCSymbol *Label = EmitCFICommon();
273  MCCFIInstruction Instruction =
274    MCCFIInstruction::createDefCfaOffset(Label, Offset);
275  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
276  CurFrame->Instructions.push_back(Instruction);
277}
278
279void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
280  MCSymbol *Label = EmitCFICommon();
281  MCCFIInstruction Instruction =
282    MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
283  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
284  CurFrame->Instructions.push_back(Instruction);
285}
286
287void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
288  MCSymbol *Label = EmitCFICommon();
289  MCCFIInstruction Instruction =
290    MCCFIInstruction::createDefCfaRegister(Label, Register);
291  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
292  CurFrame->Instructions.push_back(Instruction);
293}
294
295void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
296  MCSymbol *Label = EmitCFICommon();
297  MCCFIInstruction Instruction =
298    MCCFIInstruction::createOffset(Label, Register, Offset);
299  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
300  CurFrame->Instructions.push_back(Instruction);
301}
302
303void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
304  MCSymbol *Label = EmitCFICommon();
305  MCCFIInstruction Instruction =
306    MCCFIInstruction::createRelOffset(Label, Register, Offset);
307  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
308  CurFrame->Instructions.push_back(Instruction);
309}
310
311void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
312                                    unsigned Encoding) {
313  EnsureValidFrame();
314  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
315  CurFrame->Personality = Sym;
316  CurFrame->PersonalityEncoding = Encoding;
317}
318
319void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
320  EnsureValidFrame();
321  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
322  CurFrame->Lsda = Sym;
323  CurFrame->LsdaEncoding = Encoding;
324}
325
326void MCStreamer::EmitCFIRememberState() {
327  MCSymbol *Label = EmitCFICommon();
328  MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
329  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
330  CurFrame->Instructions.push_back(Instruction);
331}
332
333void MCStreamer::EmitCFIRestoreState() {
334  // FIXME: Error if there is no matching cfi_remember_state.
335  MCSymbol *Label = EmitCFICommon();
336  MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
337  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
338  CurFrame->Instructions.push_back(Instruction);
339}
340
341void MCStreamer::EmitCFISameValue(int64_t Register) {
342  MCSymbol *Label = EmitCFICommon();
343  MCCFIInstruction Instruction =
344    MCCFIInstruction::createSameValue(Label, Register);
345  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
346  CurFrame->Instructions.push_back(Instruction);
347}
348
349void MCStreamer::EmitCFIRestore(int64_t Register) {
350  MCSymbol *Label = EmitCFICommon();
351  MCCFIInstruction Instruction =
352    MCCFIInstruction::createRestore(Label, Register);
353  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
354  CurFrame->Instructions.push_back(Instruction);
355}
356
357void MCStreamer::EmitCFIEscape(StringRef Values) {
358  MCSymbol *Label = EmitCFICommon();
359  MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
360  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
361  CurFrame->Instructions.push_back(Instruction);
362}
363
364void MCStreamer::EmitCFISignalFrame() {
365  EnsureValidFrame();
366  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
367  CurFrame->IsSignalFrame = true;
368}
369
370void MCStreamer::EmitCFIUndefined(int64_t Register) {
371  MCSymbol *Label = EmitCFICommon();
372  MCCFIInstruction Instruction =
373    MCCFIInstruction::createUndefined(Label, Register);
374  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
375  CurFrame->Instructions.push_back(Instruction);
376}
377
378void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
379  MCSymbol *Label = EmitCFICommon();
380  MCCFIInstruction Instruction =
381    MCCFIInstruction::createRegister(Label, Register1, Register2);
382  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
383  CurFrame->Instructions.push_back(Instruction);
384}
385
386void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
387  W64UnwindInfos.push_back(Frame);
388  CurrentW64UnwindInfo = W64UnwindInfos.back();
389}
390
391void MCStreamer::EnsureValidW64UnwindInfo() {
392  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
393  if (!CurFrame || CurFrame->End)
394    report_fatal_error("No open Win64 EH frame function!");
395}
396
397void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
398  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
399  if (CurFrame && !CurFrame->End)
400    report_fatal_error("Starting a function before ending the previous one!");
401  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
402  Frame->Begin = getContext().CreateTempSymbol();
403  Frame->Function = Symbol;
404  EmitLabel(Frame->Begin);
405  setCurrentW64UnwindInfo(Frame);
406}
407
408void MCStreamer::EmitWin64EHEndProc() {
409  EnsureValidW64UnwindInfo();
410  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
411  if (CurFrame->ChainedParent)
412    report_fatal_error("Not all chained regions terminated!");
413  CurFrame->End = getContext().CreateTempSymbol();
414  EmitLabel(CurFrame->End);
415}
416
417void MCStreamer::EmitWin64EHStartChained() {
418  EnsureValidW64UnwindInfo();
419  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
420  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
421  Frame->Begin = getContext().CreateTempSymbol();
422  Frame->Function = CurFrame->Function;
423  Frame->ChainedParent = CurFrame;
424  EmitLabel(Frame->Begin);
425  setCurrentW64UnwindInfo(Frame);
426}
427
428void MCStreamer::EmitWin64EHEndChained() {
429  EnsureValidW64UnwindInfo();
430  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
431  if (!CurFrame->ChainedParent)
432    report_fatal_error("End of a chained region outside a chained region!");
433  CurFrame->End = getContext().CreateTempSymbol();
434  EmitLabel(CurFrame->End);
435  CurrentW64UnwindInfo = CurFrame->ChainedParent;
436}
437
438void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
439                                    bool Except) {
440  EnsureValidW64UnwindInfo();
441  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
442  if (CurFrame->ChainedParent)
443    report_fatal_error("Chained unwind areas can't have handlers!");
444  CurFrame->ExceptionHandler = Sym;
445  if (!Except && !Unwind)
446    report_fatal_error("Don't know what kind of handler this is!");
447  if (Unwind)
448    CurFrame->HandlesUnwind = true;
449  if (Except)
450    CurFrame->HandlesExceptions = true;
451}
452
453void MCStreamer::EmitWin64EHHandlerData() {
454  EnsureValidW64UnwindInfo();
455  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
456  if (CurFrame->ChainedParent)
457    report_fatal_error("Chained unwind areas can't have handlers!");
458}
459
460void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
461  EnsureValidW64UnwindInfo();
462  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
463  MCSymbol *Label = getContext().CreateTempSymbol();
464  MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
465  EmitLabel(Label);
466  CurFrame->Instructions.push_back(Inst);
467}
468
469void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
470  EnsureValidW64UnwindInfo();
471  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
472  if (CurFrame->LastFrameInst >= 0)
473    report_fatal_error("Frame register and offset already specified!");
474  if (Offset & 0x0F)
475    report_fatal_error("Misaligned frame pointer offset!");
476  MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, NULL, Register, Offset);
477  CurFrame->LastFrameInst = CurFrame->Instructions.size();
478  CurFrame->Instructions.push_back(Inst);
479}
480
481void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
482  EnsureValidW64UnwindInfo();
483  if (Size & 7)
484    report_fatal_error("Misaligned stack allocation!");
485  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
486  MCSymbol *Label = getContext().CreateTempSymbol();
487  MCWin64EHInstruction Inst(Label, Size);
488  EmitLabel(Label);
489  CurFrame->Instructions.push_back(Inst);
490}
491
492void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
493  EnsureValidW64UnwindInfo();
494  if (Offset & 7)
495    report_fatal_error("Misaligned saved register offset!");
496  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
497  MCSymbol *Label = getContext().CreateTempSymbol();
498  MCWin64EHInstruction Inst(
499     Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
500                            Label, Register, Offset);
501  EmitLabel(Label);
502  CurFrame->Instructions.push_back(Inst);
503}
504
505void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
506  EnsureValidW64UnwindInfo();
507  if (Offset & 0x0F)
508    report_fatal_error("Misaligned saved vector register offset!");
509  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
510  MCSymbol *Label = getContext().CreateTempSymbol();
511  MCWin64EHInstruction Inst(
512    Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
513                            Label, Register, Offset);
514  EmitLabel(Label);
515  CurFrame->Instructions.push_back(Inst);
516}
517
518void MCStreamer::EmitWin64EHPushFrame(bool Code) {
519  EnsureValidW64UnwindInfo();
520  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
521  if (CurFrame->Instructions.size() > 0)
522    report_fatal_error("If present, PushMachFrame must be the first UOP");
523  MCSymbol *Label = getContext().CreateTempSymbol();
524  MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
525  EmitLabel(Label);
526  CurFrame->Instructions.push_back(Inst);
527}
528
529void MCStreamer::EmitWin64EHEndProlog() {
530  EnsureValidW64UnwindInfo();
531  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
532  CurFrame->PrologEnd = getContext().CreateTempSymbol();
533  EmitLabel(CurFrame->PrologEnd);
534}
535
536void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
537  llvm_unreachable("This file format doesn't support this directive");
538}
539
540void MCStreamer::EmitFnStart() {
541  errs() << "Not implemented yet\n";
542  abort();
543}
544
545void MCStreamer::EmitFnEnd() {
546  errs() << "Not implemented yet\n";
547  abort();
548}
549
550void MCStreamer::EmitCantUnwind() {
551  errs() << "Not implemented yet\n";
552  abort();
553}
554
555void MCStreamer::EmitHandlerData() {
556  errs() << "Not implemented yet\n";
557  abort();
558}
559
560void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
561  errs() << "Not implemented yet\n";
562  abort();
563}
564
565void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
566  errs() << "Not implemented yet\n";
567  abort();
568}
569
570void MCStreamer::EmitPad(int64_t Offset) {
571  errs() << "Not implemented yet\n";
572  abort();
573}
574
575void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
576  errs() << "Not implemented yet\n";
577  abort();
578}
579
580void MCStreamer::EmitTCEntry(const MCSymbol &S) {
581  llvm_unreachable("Unsupported method");
582}
583
584/// EmitRawText - If this file is backed by an assembly streamer, this dumps
585/// the specified string in the output .s file.  This capability is
586/// indicated by the hasRawTextSupport() predicate.
587void MCStreamer::EmitRawText(StringRef String) {
588  errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
589  " something must not be fully mc'ized\n";
590  abort();
591}
592
593void MCStreamer::EmitRawText(const Twine &T) {
594  SmallString<128> Str;
595  T.toVector(Str);
596  EmitRawText(Str.str());
597}
598
599void MCStreamer::EmitFrames(bool usingCFI) {
600  if (!getNumFrameInfos())
601    return;
602
603  if (EmitEHFrame)
604    MCDwarfFrameEmitter::Emit(*this, usingCFI, true);
605
606  if (EmitDebugFrame)
607    MCDwarfFrameEmitter::Emit(*this, usingCFI, false);
608}
609
610void MCStreamer::EmitW64Tables() {
611  if (!getNumW64UnwindInfos())
612    return;
613
614  MCWin64EHUnwindEmitter::Emit(*this);
615}
616
617void MCStreamer::Finish() {
618  if (!FrameInfos.empty() && !FrameInfos.back().End)
619    report_fatal_error("Unfinished frame!");
620
621  FinishImpl();
622}
623
624MCSymbolData &MCStreamer::getOrCreateSymbolData(MCSymbol *Symbol) {
625  report_fatal_error("Not supported!");
626  return *(static_cast<MCSymbolData*> (NULL));
627}
628