MCStreamer.cpp revision b9d1005e96681b5c8cc1ed959fa129de62933020 
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(MCContext &Ctx)
25  : Context(Ctx), EmitEHFrame(true), EmitDebugFrame(false),
26    CurrentW64UnwindInfo(0), LastSymbol(0),
27    AutoInitSections(false) {
28  const MCSection *section = NULL;
29  SectionStack.push_back(std::make_pair(section, section));
30}
31
32MCStreamer::~MCStreamer() {
33  for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
34    delete W64UnwindInfos[i];
35}
36
37void MCStreamer::reset() {
38  for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
39    delete W64UnwindInfos[i];
40  EmitEHFrame = true;
41  EmitDebugFrame = false;
42  CurrentW64UnwindInfo = 0;
43  LastSymbol = 0;
44  const MCSection *section = NULL;
45  SectionStack.clear();
46  SectionStack.push_back(std::make_pair(section, section));
47}
48
49const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
50                                          const MCSymbol *A,
51                                          const MCSymbol *B) {
52  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
53  const MCExpr *ARef =
54    MCSymbolRefExpr::Create(A, Variant, Context);
55  const MCExpr *BRef =
56    MCSymbolRefExpr::Create(B, Variant, Context);
57  const MCExpr *AddrDelta =
58    MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
59  return AddrDelta;
60}
61
62const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
63  if (Context.getAsmInfo().hasAggressiveSymbolFolding() ||
64      isa<MCSymbolRefExpr>(Expr))
65    return Expr;
66
67  MCSymbol *ABS = Context.CreateTempSymbol();
68  EmitAssignment(ABS, Expr);
69  return MCSymbolRefExpr::Create(ABS, Context);
70}
71
72raw_ostream &MCStreamer::GetCommentOS() {
73  // By default, discard comments.
74  return nulls();
75}
76
77void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
78                                      const MCSymbol *Label, int PointerSize) {
79  // emit the sequence to set the address
80  EmitIntValue(dwarf::DW_LNS_extended_op, 1);
81  EmitULEB128IntValue(PointerSize + 1);
82  EmitIntValue(dwarf::DW_LNE_set_address, 1);
83  EmitSymbolValue(Label, PointerSize);
84
85  // emit the sequence for the LineDelta (from 1) and a zero address delta.
86  MCDwarfLineAddr::Emit(this, LineDelta, 0);
87}
88
89/// EmitIntValue - Special case of EmitValue that avoids the client having to
90/// pass in a MCExpr for constant integers.
91void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
92                              unsigned AddrSpace) {
93  assert(Size <= 8 && "Invalid size");
94  assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
95         "Invalid size");
96  char buf[8];
97  const bool isLittleEndian = Context.getAsmInfo().isLittleEndian();
98  for (unsigned i = 0; i != Size; ++i) {
99    unsigned index = isLittleEndian ? i : (Size - i - 1);
100    buf[i] = uint8_t(Value >> (index * 8));
101  }
102  EmitBytes(StringRef(buf, Size), AddrSpace);
103}
104
105/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
106/// client having to pass in a MCExpr for constant integers.
107void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace,
108                                     unsigned Padding) {
109  SmallString<128> Tmp;
110  raw_svector_ostream OSE(Tmp);
111  encodeULEB128(Value, OSE, Padding);
112  EmitBytes(OSE.str(), AddrSpace);
113}
114
115/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
116/// client having to pass in a MCExpr for constant integers.
117void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
118  SmallString<128> Tmp;
119  raw_svector_ostream OSE(Tmp);
120  encodeSLEB128(Value, OSE);
121  EmitBytes(OSE.str(), AddrSpace);
122}
123
124void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
125                              unsigned AddrSpace) {
126  const MCExpr *ABS = ForceExpAbs(Value);
127  EmitValue(ABS, Size, AddrSpace);
128}
129
130
131void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
132                           unsigned AddrSpace) {
133  EmitValueImpl(Value, Size, AddrSpace);
134}
135
136void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
137                                  unsigned AddrSpace) {
138  EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size,
139                AddrSpace);
140}
141
142void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
143  report_fatal_error("unsupported directive in streamer");
144}
145
146void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
147  report_fatal_error("unsupported directive in streamer");
148}
149
150/// EmitFill - Emit NumBytes bytes worth of the value specified by
151/// FillValue.  This implements directives such as '.space'.
152void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
153                          unsigned AddrSpace) {
154  const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
155  for (uint64_t i = 0, e = NumBytes; i != e; ++i)
156    EmitValue(E, 1, AddrSpace);
157}
158
159bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
160                                        StringRef Directory,
161                                        StringRef Filename) {
162  return getContext().GetDwarfFile(Directory, Filename, FileNo) == 0;
163}
164
165void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
166                                       unsigned Column, unsigned Flags,
167                                       unsigned Isa,
168                                       unsigned Discriminator,
169                                       StringRef FileName) {
170  getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
171                                  Discriminator);
172}
173
174MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
175  if (FrameInfos.empty())
176    return NULL;
177  return &FrameInfos.back();
178}
179
180void MCStreamer::EnsureValidFrame() {
181  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
182  if (!CurFrame || CurFrame->End)
183    report_fatal_error("No open frame");
184}
185
186void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
187                                     MCSymbol *EHSymbol) {
188}
189
190void MCStreamer::EmitLabel(MCSymbol *Symbol) {
191  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
192  assert(getCurrentSection() && "Cannot emit before setting section!");
193  Symbol->setSection(*getCurrentSection());
194  LastSymbol = Symbol;
195}
196
197void MCStreamer::EmitDebugLabel(MCSymbol *Symbol) {
198  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
199  assert(getCurrentSection() && "Cannot emit before setting section!");
200  Symbol->setSection(*getCurrentSection());
201  LastSymbol = Symbol;
202}
203
204void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
205  EnsureValidFrame();
206  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
207  CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
208}
209
210void MCStreamer::EmitCFISections(bool EH, bool Debug) {
211  assert(EH || Debug);
212  EmitEHFrame = EH;
213  EmitDebugFrame = Debug;
214}
215
216void MCStreamer::EmitCFIStartProc() {
217  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
218  if (CurFrame && !CurFrame->End)
219    report_fatal_error("Starting a frame before finishing the previous one!");
220
221  MCDwarfFrameInfo Frame;
222  EmitCFIStartProcImpl(Frame);
223
224  FrameInfos.push_back(Frame);
225}
226
227void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
228}
229
230void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
231  Frame.Function = LastSymbol;
232  // If the function is externally visible, we need to create a local
233  // symbol to avoid relocations.
234  StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
235  if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
236    Frame.Begin = LastSymbol;
237  } else {
238    Frame.Begin = getContext().CreateTempSymbol();
239    EmitLabel(Frame.Begin);
240  }
241}
242
243void MCStreamer::EmitCFIEndProc() {
244  EnsureValidFrame();
245  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
246  EmitCFIEndProcImpl(*CurFrame);
247}
248
249void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
250}
251
252void MCStreamer::RecordProcEnd(MCDwarfFrameInfo &Frame) {
253  Frame.End = getContext().CreateTempSymbol();
254  EmitLabel(Frame.End);
255}
256
257MCSymbol *MCStreamer::EmitCFICommon() {
258  EnsureValidFrame();
259  MCSymbol *Label = getContext().CreateTempSymbol();
260  EmitLabel(Label);
261  return Label;
262}
263
264void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
265  MCSymbol *Label = EmitCFICommon();
266  MCCFIInstruction Instruction =
267    MCCFIInstruction::createDefCfa(Label, Register, Offset);
268  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
269  CurFrame->Instructions.push_back(Instruction);
270}
271
272void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
273  MCSymbol *Label = EmitCFICommon();
274  MCCFIInstruction Instruction =
275    MCCFIInstruction::createDefCfaOffset(Label, Offset);
276  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
277  CurFrame->Instructions.push_back(Instruction);
278}
279
280void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
281  MCSymbol *Label = EmitCFICommon();
282  MCCFIInstruction Instruction =
283    MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
284  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
285  CurFrame->Instructions.push_back(Instruction);
286}
287
288void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
289  MCSymbol *Label = EmitCFICommon();
290  MCCFIInstruction Instruction =
291    MCCFIInstruction::createDefCfaRegister(Label, Register);
292  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
293  CurFrame->Instructions.push_back(Instruction);
294}
295
296void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
297  MCSymbol *Label = EmitCFICommon();
298  MCCFIInstruction Instruction =
299    MCCFIInstruction::createOffset(Label, Register, Offset);
300  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
301  CurFrame->Instructions.push_back(Instruction);
302}
303
304void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
305  MCSymbol *Label = EmitCFICommon();
306  MCCFIInstruction Instruction =
307    MCCFIInstruction::createRelOffset(Label, Register, Offset);
308  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
309  CurFrame->Instructions.push_back(Instruction);
310}
311
312void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
313                                    unsigned Encoding) {
314  EnsureValidFrame();
315  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
316  CurFrame->Personality = Sym;
317  CurFrame->PersonalityEncoding = Encoding;
318}
319
320void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
321  EnsureValidFrame();
322  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
323  CurFrame->Lsda = Sym;
324  CurFrame->LsdaEncoding = Encoding;
325}
326
327void MCStreamer::EmitCFIRememberState() {
328  MCSymbol *Label = EmitCFICommon();
329  MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
330  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
331  CurFrame->Instructions.push_back(Instruction);
332}
333
334void MCStreamer::EmitCFIRestoreState() {
335  // FIXME: Error if there is no matching cfi_remember_state.
336  MCSymbol *Label = EmitCFICommon();
337  MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
338  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
339  CurFrame->Instructions.push_back(Instruction);
340}
341
342void MCStreamer::EmitCFISameValue(int64_t Register) {
343  MCSymbol *Label = EmitCFICommon();
344  MCCFIInstruction Instruction =
345    MCCFIInstruction::createSameValue(Label, Register);
346  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
347  CurFrame->Instructions.push_back(Instruction);
348}
349
350void MCStreamer::EmitCFIRestore(int64_t Register) {
351  MCSymbol *Label = EmitCFICommon();
352  MCCFIInstruction Instruction =
353    MCCFIInstruction::createRestore(Label, Register);
354  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
355  CurFrame->Instructions.push_back(Instruction);
356}
357
358void MCStreamer::EmitCFIEscape(StringRef Values) {
359  MCSymbol *Label = EmitCFICommon();
360  MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
361  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
362  CurFrame->Instructions.push_back(Instruction);
363}
364
365void MCStreamer::EmitCFISignalFrame() {
366  EnsureValidFrame();
367  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
368  CurFrame->IsSignalFrame = true;
369}
370
371void MCStreamer::EmitCFIUndefined(int64_t Register) {
372  MCSymbol *Label = EmitCFICommon();
373  MCCFIInstruction Instruction =
374    MCCFIInstruction::createUndefined(Label, Register);
375  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
376  CurFrame->Instructions.push_back(Instruction);
377}
378
379void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
380  MCSymbol *Label = EmitCFICommon();
381  MCCFIInstruction Instruction =
382    MCCFIInstruction::createRegister(Label, Register1, Register2);
383  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
384  CurFrame->Instructions.push_back(Instruction);
385}
386
387void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
388  W64UnwindInfos.push_back(Frame);
389  CurrentW64UnwindInfo = W64UnwindInfos.back();
390}
391
392void MCStreamer::EnsureValidW64UnwindInfo() {
393  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
394  if (!CurFrame || CurFrame->End)
395    report_fatal_error("No open Win64 EH frame function!");
396}
397
398void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
399  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
400  if (CurFrame && !CurFrame->End)
401    report_fatal_error("Starting a function before ending the previous one!");
402  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
403  Frame->Begin = getContext().CreateTempSymbol();
404  Frame->Function = Symbol;
405  EmitLabel(Frame->Begin);
406  setCurrentW64UnwindInfo(Frame);
407}
408
409void MCStreamer::EmitWin64EHEndProc() {
410  EnsureValidW64UnwindInfo();
411  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
412  if (CurFrame->ChainedParent)
413    report_fatal_error("Not all chained regions terminated!");
414  CurFrame->End = getContext().CreateTempSymbol();
415  EmitLabel(CurFrame->End);
416}
417
418void MCStreamer::EmitWin64EHStartChained() {
419  EnsureValidW64UnwindInfo();
420  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
421  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
422  Frame->Begin = getContext().CreateTempSymbol();
423  Frame->Function = CurFrame->Function;
424  Frame->ChainedParent = CurFrame;
425  EmitLabel(Frame->Begin);
426  setCurrentW64UnwindInfo(Frame);
427}
428
429void MCStreamer::EmitWin64EHEndChained() {
430  EnsureValidW64UnwindInfo();
431  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
432  if (!CurFrame->ChainedParent)
433    report_fatal_error("End of a chained region outside a chained region!");
434  CurFrame->End = getContext().CreateTempSymbol();
435  EmitLabel(CurFrame->End);
436  CurrentW64UnwindInfo = CurFrame->ChainedParent;
437}
438
439void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
440                                    bool Except) {
441  EnsureValidW64UnwindInfo();
442  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
443  if (CurFrame->ChainedParent)
444    report_fatal_error("Chained unwind areas can't have handlers!");
445  CurFrame->ExceptionHandler = Sym;
446  if (!Except && !Unwind)
447    report_fatal_error("Don't know what kind of handler this is!");
448  if (Unwind)
449    CurFrame->HandlesUnwind = true;
450  if (Except)
451    CurFrame->HandlesExceptions = true;
452}
453
454void MCStreamer::EmitWin64EHHandlerData() {
455  EnsureValidW64UnwindInfo();
456  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
457  if (CurFrame->ChainedParent)
458    report_fatal_error("Chained unwind areas can't have handlers!");
459}
460
461void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
462  EnsureValidW64UnwindInfo();
463  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
464  MCSymbol *Label = getContext().CreateTempSymbol();
465  MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
466  EmitLabel(Label);
467  CurFrame->Instructions.push_back(Inst);
468}
469
470void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
471  EnsureValidW64UnwindInfo();
472  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
473  if (CurFrame->LastFrameInst >= 0)
474    report_fatal_error("Frame register and offset already specified!");
475  if (Offset & 0x0F)
476    report_fatal_error("Misaligned frame pointer offset!");
477  MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, NULL, Register, Offset);
478  CurFrame->LastFrameInst = CurFrame->Instructions.size();
479  CurFrame->Instructions.push_back(Inst);
480}
481
482void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
483  EnsureValidW64UnwindInfo();
484  if (Size & 7)
485    report_fatal_error("Misaligned stack allocation!");
486  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
487  MCSymbol *Label = getContext().CreateTempSymbol();
488  MCWin64EHInstruction Inst(Label, Size);
489  EmitLabel(Label);
490  CurFrame->Instructions.push_back(Inst);
491}
492
493void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
494  EnsureValidW64UnwindInfo();
495  if (Offset & 7)
496    report_fatal_error("Misaligned saved register offset!");
497  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
498  MCSymbol *Label = getContext().CreateTempSymbol();
499  MCWin64EHInstruction Inst(
500     Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
501                            Label, Register, Offset);
502  EmitLabel(Label);
503  CurFrame->Instructions.push_back(Inst);
504}
505
506void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
507  EnsureValidW64UnwindInfo();
508  if (Offset & 0x0F)
509    report_fatal_error("Misaligned saved vector register offset!");
510  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
511  MCSymbol *Label = getContext().CreateTempSymbol();
512  MCWin64EHInstruction Inst(
513    Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
514                            Label, Register, Offset);
515  EmitLabel(Label);
516  CurFrame->Instructions.push_back(Inst);
517}
518
519void MCStreamer::EmitWin64EHPushFrame(bool Code) {
520  EnsureValidW64UnwindInfo();
521  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
522  if (CurFrame->Instructions.size() > 0)
523    report_fatal_error("If present, PushMachFrame must be the first UOP");
524  MCSymbol *Label = getContext().CreateTempSymbol();
525  MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
526  EmitLabel(Label);
527  CurFrame->Instructions.push_back(Inst);
528}
529
530void MCStreamer::EmitWin64EHEndProlog() {
531  EnsureValidW64UnwindInfo();
532  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
533  CurFrame->PrologEnd = getContext().CreateTempSymbol();
534  EmitLabel(CurFrame->PrologEnd);
535}
536
537void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
538  llvm_unreachable("This file format doesn't support this directive");
539}
540
541void MCStreamer::EmitFnStart() {
542  errs() << "Not implemented yet\n";
543  abort();
544}
545
546void MCStreamer::EmitFnEnd() {
547  errs() << "Not implemented yet\n";
548  abort();
549}
550
551void MCStreamer::EmitCantUnwind() {
552  errs() << "Not implemented yet\n";
553  abort();
554}
555
556void MCStreamer::EmitHandlerData() {
557  errs() << "Not implemented yet\n";
558  abort();
559}
560
561void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
562  errs() << "Not implemented yet\n";
563  abort();
564}
565
566void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
567  errs() << "Not implemented yet\n";
568  abort();
569}
570
571void MCStreamer::EmitPad(int64_t Offset) {
572  errs() << "Not implemented yet\n";
573  abort();
574}
575
576void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
577  errs() << "Not implemented yet\n";
578  abort();
579}
580
581void MCStreamer::EmitTCEntry(const MCSymbol &S) {
582  llvm_unreachable("Unsupported method");
583}
584
585/// EmitRawText - If this file is backed by an assembly streamer, this dumps
586/// the specified string in the output .s file.  This capability is
587/// indicated by the hasRawTextSupport() predicate.
588void MCStreamer::EmitRawText(StringRef String) {
589  errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
590  " something must not be fully mc'ized\n";
591  abort();
592}
593
594void MCStreamer::EmitRawText(const Twine &T) {
595  SmallString<128> Str;
596  T.toVector(Str);
597  EmitRawText(Str.str());
598}
599
600void MCStreamer::EmitFrames(bool usingCFI) {
601  if (!getNumFrameInfos())
602    return;
603
604  if (EmitEHFrame)
605    MCDwarfFrameEmitter::Emit(*this, usingCFI, true);
606
607  if (EmitDebugFrame)
608    MCDwarfFrameEmitter::Emit(*this, usingCFI, false);
609}
610
611void MCStreamer::EmitW64Tables() {
612  if (!getNumW64UnwindInfos())
613    return;
614
615  MCWin64EHUnwindEmitter::Emit(*this);
616}
617
618void MCStreamer::Finish() {
619  if (!FrameInfos.empty() && !FrameInfos.back().End)
620    report_fatal_error("Unfinished frame!");
621
622  FinishImpl();
623}
624