MCStreamer.cpp revision da11df0c22f5d0ba2e2be3ae4a7076c806233db8 
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/MCAsmBackend.h"
14#include "llvm/MC/MCAsmInfo.h"
15#include "llvm/MC/MCContext.h"
16#include "llvm/MC/MCExpr.h"
17#include "llvm/MC/MCObjectWriter.h"
18#include "llvm/MC/MCSymbol.h"
19#include "llvm/Support/ErrorHandling.h"
20#include "llvm/Support/LEB128.h"
21#include "llvm/Support/raw_ostream.h"
22#include <cstdlib>
23using namespace llvm;
24
25MCStreamer::MCStreamer(StreamerKind Kind, MCContext &Ctx)
26    : Kind(Kind), Context(Ctx), EmitEHFrame(true), EmitDebugFrame(false),
27      CurrentW64UnwindInfo(0), LastSymbol(0), AutoInitSections(false) {
28  SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
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  W64UnwindInfos.clear();
40  EmitEHFrame = true;
41  EmitDebugFrame = false;
42  CurrentW64UnwindInfo = 0;
43  LastSymbol = 0;
44  SectionStack.clear();
45  SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
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::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
77  if (!MAB) return;
78  for (std::vector<MCDwarfFrameInfo>::iterator I = FrameInfos.begin(),
79         E = FrameInfos.end(); I != E; ++I)
80    I->CompactUnwindEncoding =
81      MAB->generateCompactUnwindEncoding(I->Instructions);
82}
83
84void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
85                                      const MCSymbol *Label, int PointerSize) {
86  // emit the sequence to set the address
87  EmitIntValue(dwarf::DW_LNS_extended_op, 1);
88  EmitULEB128IntValue(PointerSize + 1);
89  EmitIntValue(dwarf::DW_LNE_set_address, 1);
90  EmitSymbolValue(Label, PointerSize);
91
92  // emit the sequence for the LineDelta (from 1) and a zero address delta.
93  MCDwarfLineAddr::Emit(this, LineDelta, 0);
94}
95
96/// EmitIntValue - Special case of EmitValue that avoids the client having to
97/// pass in a MCExpr for constant integers.
98void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
99  assert(Size <= 8 && "Invalid size");
100  assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
101         "Invalid size");
102  char buf[8];
103  const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
104  for (unsigned i = 0; i != Size; ++i) {
105    unsigned index = isLittleEndian ? i : (Size - i - 1);
106    buf[i] = uint8_t(Value >> (index * 8));
107  }
108  EmitBytes(StringRef(buf, Size));
109}
110
111/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
112/// client having to pass in a MCExpr for constant integers.
113void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
114  SmallString<128> Tmp;
115  raw_svector_ostream OSE(Tmp);
116  encodeULEB128(Value, OSE, Padding);
117  EmitBytes(OSE.str());
118}
119
120/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
121/// client having to pass in a MCExpr for constant integers.
122void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
123  SmallString<128> Tmp;
124  raw_svector_ostream OSE(Tmp);
125  encodeSLEB128(Value, OSE);
126  EmitBytes(OSE.str());
127}
128
129void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
130  const MCExpr *ABS = ForceExpAbs(Value);
131  EmitValue(ABS, Size);
132}
133
134
135void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size) {
136  EmitValueImpl(Value, Size);
137}
138
139void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size) {
140  EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
141}
142
143void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
144  report_fatal_error("unsupported directive in streamer");
145}
146
147void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
148  report_fatal_error("unsupported directive in streamer");
149}
150
151/// EmitFill - Emit NumBytes bytes worth of the value specified by
152/// FillValue.  This implements directives such as '.space'.
153void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
154  const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
155  for (uint64_t i = 0, e = NumBytes; i != e; ++i)
156    EmitValue(E, 1);
157}
158
159/// The implementation in this class just redirects to EmitFill.
160void MCStreamer::EmitZeros(uint64_t NumBytes) {
161  EmitFill(NumBytes, 0);
162}
163
164bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
165                                        StringRef Directory,
166                                        StringRef Filename, unsigned CUID) {
167  return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID) == 0;
168}
169
170void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
171                                       unsigned Column, unsigned Flags,
172                                       unsigned Isa,
173                                       unsigned Discriminator,
174                                       StringRef FileName) {
175  getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
176                                  Discriminator);
177}
178
179MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
180  if (FrameInfos.empty())
181    return 0;
182  return &FrameInfos.back();
183}
184
185void MCStreamer::EnsureValidFrame() {
186  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
187  if (!CurFrame || CurFrame->End)
188    report_fatal_error("No open frame");
189}
190
191void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
192                                     MCSymbol *EHSymbol) {
193}
194
195void MCStreamer::EmitLabel(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
202void MCStreamer::EmitDebugLabel(MCSymbol *Symbol) {
203  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
204  assert(getCurrentSection().first && "Cannot emit before setting section!");
205  Symbol->setSection(*getCurrentSection().first);
206  LastSymbol = Symbol;
207}
208
209void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
210  EnsureValidFrame();
211  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
212  CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
213}
214
215void MCStreamer::EmitCFISections(bool EH, bool Debug) {
216  assert(EH || Debug);
217  EmitEHFrame = EH;
218  EmitDebugFrame = Debug;
219}
220
221void MCStreamer::EmitCFIStartProc() {
222  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
223  if (CurFrame && !CurFrame->End)
224    report_fatal_error("Starting a frame before finishing the previous one!");
225
226  MCDwarfFrameInfo Frame;
227  EmitCFIStartProcImpl(Frame);
228
229  FrameInfos.push_back(Frame);
230}
231
232void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
233}
234
235void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
236  Frame.Function = LastSymbol;
237  // If the function is externally visible, we need to create a local
238  // symbol to avoid relocations.
239  StringRef Prefix = getContext().getAsmInfo()->getPrivateGlobalPrefix();
240  if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
241    Frame.Begin = LastSymbol;
242  } else {
243    Frame.Begin = getContext().CreateTempSymbol();
244    EmitLabel(Frame.Begin);
245  }
246}
247
248void MCStreamer::EmitCFIEndProc() {
249  EnsureValidFrame();
250  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
251  EmitCFIEndProcImpl(*CurFrame);
252}
253
254void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
255}
256
257void MCStreamer::RecordProcEnd(MCDwarfFrameInfo &Frame) {
258  Frame.End = getContext().CreateTempSymbol();
259  EmitLabel(Frame.End);
260}
261
262MCSymbol *MCStreamer::EmitCFICommon() {
263  EnsureValidFrame();
264  MCSymbol *Label = getContext().CreateTempSymbol();
265  EmitLabel(Label);
266  return Label;
267}
268
269void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
270  MCSymbol *Label = EmitCFICommon();
271  MCCFIInstruction Instruction =
272    MCCFIInstruction::createDefCfa(Label, Register, Offset);
273  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
274  CurFrame->Instructions.push_back(Instruction);
275}
276
277void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
278  MCSymbol *Label = EmitCFICommon();
279  MCCFIInstruction Instruction =
280    MCCFIInstruction::createDefCfaOffset(Label, Offset);
281  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
282  CurFrame->Instructions.push_back(Instruction);
283}
284
285void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
286  MCSymbol *Label = EmitCFICommon();
287  MCCFIInstruction Instruction =
288    MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
289  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
290  CurFrame->Instructions.push_back(Instruction);
291}
292
293void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
294  MCSymbol *Label = EmitCFICommon();
295  MCCFIInstruction Instruction =
296    MCCFIInstruction::createDefCfaRegister(Label, Register);
297  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
298  CurFrame->Instructions.push_back(Instruction);
299}
300
301void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
302  MCSymbol *Label = EmitCFICommon();
303  MCCFIInstruction Instruction =
304    MCCFIInstruction::createOffset(Label, Register, Offset);
305  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
306  CurFrame->Instructions.push_back(Instruction);
307}
308
309void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
310  MCSymbol *Label = EmitCFICommon();
311  MCCFIInstruction Instruction =
312    MCCFIInstruction::createRelOffset(Label, Register, Offset);
313  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
314  CurFrame->Instructions.push_back(Instruction);
315}
316
317void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
318                                    unsigned Encoding) {
319  EnsureValidFrame();
320  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
321  CurFrame->Personality = Sym;
322  CurFrame->PersonalityEncoding = Encoding;
323}
324
325void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
326  EnsureValidFrame();
327  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
328  CurFrame->Lsda = Sym;
329  CurFrame->LsdaEncoding = Encoding;
330}
331
332void MCStreamer::EmitCFIRememberState() {
333  MCSymbol *Label = EmitCFICommon();
334  MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
335  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
336  CurFrame->Instructions.push_back(Instruction);
337}
338
339void MCStreamer::EmitCFIRestoreState() {
340  // FIXME: Error if there is no matching cfi_remember_state.
341  MCSymbol *Label = EmitCFICommon();
342  MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
343  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
344  CurFrame->Instructions.push_back(Instruction);
345}
346
347void MCStreamer::EmitCFISameValue(int64_t Register) {
348  MCSymbol *Label = EmitCFICommon();
349  MCCFIInstruction Instruction =
350    MCCFIInstruction::createSameValue(Label, Register);
351  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
352  CurFrame->Instructions.push_back(Instruction);
353}
354
355void MCStreamer::EmitCFIRestore(int64_t Register) {
356  MCSymbol *Label = EmitCFICommon();
357  MCCFIInstruction Instruction =
358    MCCFIInstruction::createRestore(Label, Register);
359  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
360  CurFrame->Instructions.push_back(Instruction);
361}
362
363void MCStreamer::EmitCFIEscape(StringRef Values) {
364  MCSymbol *Label = EmitCFICommon();
365  MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
366  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
367  CurFrame->Instructions.push_back(Instruction);
368}
369
370void MCStreamer::EmitCFISignalFrame() {
371  EnsureValidFrame();
372  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
373  CurFrame->IsSignalFrame = true;
374}
375
376void MCStreamer::EmitCFIUndefined(int64_t Register) {
377  MCSymbol *Label = EmitCFICommon();
378  MCCFIInstruction Instruction =
379    MCCFIInstruction::createUndefined(Label, Register);
380  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
381  CurFrame->Instructions.push_back(Instruction);
382}
383
384void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
385  MCSymbol *Label = EmitCFICommon();
386  MCCFIInstruction Instruction =
387    MCCFIInstruction::createRegister(Label, Register1, Register2);
388  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
389  CurFrame->Instructions.push_back(Instruction);
390}
391
392void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
393  W64UnwindInfos.push_back(Frame);
394  CurrentW64UnwindInfo = W64UnwindInfos.back();
395}
396
397void MCStreamer::EnsureValidW64UnwindInfo() {
398  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
399  if (!CurFrame || CurFrame->End)
400    report_fatal_error("No open Win64 EH frame function!");
401}
402
403void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
404  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
405  if (CurFrame && !CurFrame->End)
406    report_fatal_error("Starting a function before ending the previous one!");
407  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
408  Frame->Begin = getContext().CreateTempSymbol();
409  Frame->Function = Symbol;
410  EmitLabel(Frame->Begin);
411  setCurrentW64UnwindInfo(Frame);
412}
413
414void MCStreamer::EmitWin64EHEndProc() {
415  EnsureValidW64UnwindInfo();
416  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
417  if (CurFrame->ChainedParent)
418    report_fatal_error("Not all chained regions terminated!");
419  CurFrame->End = getContext().CreateTempSymbol();
420  EmitLabel(CurFrame->End);
421}
422
423void MCStreamer::EmitWin64EHStartChained() {
424  EnsureValidW64UnwindInfo();
425  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
426  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
427  Frame->Begin = getContext().CreateTempSymbol();
428  Frame->Function = CurFrame->Function;
429  Frame->ChainedParent = CurFrame;
430  EmitLabel(Frame->Begin);
431  setCurrentW64UnwindInfo(Frame);
432}
433
434void MCStreamer::EmitWin64EHEndChained() {
435  EnsureValidW64UnwindInfo();
436  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
437  if (!CurFrame->ChainedParent)
438    report_fatal_error("End of a chained region outside a chained region!");
439  CurFrame->End = getContext().CreateTempSymbol();
440  EmitLabel(CurFrame->End);
441  CurrentW64UnwindInfo = CurFrame->ChainedParent;
442}
443
444void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
445                                    bool Except) {
446  EnsureValidW64UnwindInfo();
447  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
448  if (CurFrame->ChainedParent)
449    report_fatal_error("Chained unwind areas can't have handlers!");
450  CurFrame->ExceptionHandler = Sym;
451  if (!Except && !Unwind)
452    report_fatal_error("Don't know what kind of handler this is!");
453  if (Unwind)
454    CurFrame->HandlesUnwind = true;
455  if (Except)
456    CurFrame->HandlesExceptions = true;
457}
458
459void MCStreamer::EmitWin64EHHandlerData() {
460  EnsureValidW64UnwindInfo();
461  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
462  if (CurFrame->ChainedParent)
463    report_fatal_error("Chained unwind areas can't have handlers!");
464}
465
466void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
467  EnsureValidW64UnwindInfo();
468  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
469  MCSymbol *Label = getContext().CreateTempSymbol();
470  MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
471  EmitLabel(Label);
472  CurFrame->Instructions.push_back(Inst);
473}
474
475void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
476  EnsureValidW64UnwindInfo();
477  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
478  if (CurFrame->LastFrameInst >= 0)
479    report_fatal_error("Frame register and offset already specified!");
480  if (Offset & 0x0F)
481    report_fatal_error("Misaligned frame pointer offset!");
482  MCSymbol *Label = getContext().CreateTempSymbol();
483  MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, Label, Register, Offset);
484  EmitLabel(Label);
485  CurFrame->LastFrameInst = CurFrame->Instructions.size();
486  CurFrame->Instructions.push_back(Inst);
487}
488
489void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
490  EnsureValidW64UnwindInfo();
491  if (Size & 7)
492    report_fatal_error("Misaligned stack allocation!");
493  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
494  MCSymbol *Label = getContext().CreateTempSymbol();
495  MCWin64EHInstruction Inst(Label, Size);
496  EmitLabel(Label);
497  CurFrame->Instructions.push_back(Inst);
498}
499
500void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
501  EnsureValidW64UnwindInfo();
502  if (Offset & 7)
503    report_fatal_error("Misaligned saved register offset!");
504  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
505  MCSymbol *Label = getContext().CreateTempSymbol();
506  MCWin64EHInstruction Inst(
507     Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
508                            Label, Register, Offset);
509  EmitLabel(Label);
510  CurFrame->Instructions.push_back(Inst);
511}
512
513void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
514  EnsureValidW64UnwindInfo();
515  if (Offset & 0x0F)
516    report_fatal_error("Misaligned saved vector register offset!");
517  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
518  MCSymbol *Label = getContext().CreateTempSymbol();
519  MCWin64EHInstruction Inst(
520    Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
521                            Label, Register, Offset);
522  EmitLabel(Label);
523  CurFrame->Instructions.push_back(Inst);
524}
525
526void MCStreamer::EmitWin64EHPushFrame(bool Code) {
527  EnsureValidW64UnwindInfo();
528  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
529  if (CurFrame->Instructions.size() > 0)
530    report_fatal_error("If present, PushMachFrame must be the first UOP");
531  MCSymbol *Label = getContext().CreateTempSymbol();
532  MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
533  EmitLabel(Label);
534  CurFrame->Instructions.push_back(Inst);
535}
536
537void MCStreamer::EmitWin64EHEndProlog() {
538  EnsureValidW64UnwindInfo();
539  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
540  CurFrame->PrologEnd = getContext().CreateTempSymbol();
541  EmitLabel(CurFrame->PrologEnd);
542}
543
544void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
545  llvm_unreachable("This file format doesn't support this directive");
546}
547
548void MCStreamer::EmitFnStart() {
549  errs() << "Not implemented yet\n";
550  abort();
551}
552
553void MCStreamer::EmitFnEnd() {
554  errs() << "Not implemented yet\n";
555  abort();
556}
557
558void MCStreamer::EmitCantUnwind() {
559  errs() << "Not implemented yet\n";
560  abort();
561}
562
563void MCStreamer::EmitHandlerData() {
564  errs() << "Not implemented yet\n";
565  abort();
566}
567
568void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
569  errs() << "Not implemented yet\n";
570  abort();
571}
572
573void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
574  errs() << "Not implemented yet\n";
575  abort();
576}
577
578void MCStreamer::EmitPad(int64_t Offset) {
579  errs() << "Not implemented yet\n";
580  abort();
581}
582
583void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
584  errs() << "Not implemented yet\n";
585  abort();
586}
587
588void MCStreamer::EmitTCEntry(const MCSymbol &S) {
589  llvm_unreachable("Unsupported method");
590}
591
592/// EmitRawText - If this file is backed by an assembly streamer, this dumps
593/// the specified string in the output .s file.  This capability is
594/// indicated by the hasRawTextSupport() predicate.
595void MCStreamer::EmitRawText(StringRef String) {
596  errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
597  " something must not be fully mc'ized\n";
598  abort();
599}
600
601void MCStreamer::EmitRawText(const Twine &T) {
602  SmallString<128> Str;
603  T.toVector(Str);
604  EmitRawText(Str.str());
605}
606
607void MCStreamer::EmitFrames(MCAsmBackend *MAB, bool usingCFI) {
608  if (!getNumFrameInfos())
609    return;
610
611  if (EmitEHFrame)
612    MCDwarfFrameEmitter::Emit(*this, MAB, usingCFI, true);
613
614  if (EmitDebugFrame)
615    MCDwarfFrameEmitter::Emit(*this, MAB, usingCFI, false);
616}
617
618void MCStreamer::EmitW64Tables() {
619  if (!getNumW64UnwindInfos())
620    return;
621
622  MCWin64EHUnwindEmitter::Emit(*this);
623}
624
625void MCStreamer::Finish() {
626  if (!FrameInfos.empty() && !FrameInfos.back().End)
627    report_fatal_error("Unfinished frame!");
628
629  FinishImpl();
630}
631
632MCSymbolData &MCStreamer::getOrCreateSymbolData(MCSymbol *Symbol) {
633  report_fatal_error("Not supported!");
634  return *(static_cast<MCSymbolData*>(0));
635}
636