MCStreamer.cpp revision 5cc319a42a914b24b164a94d9a563c728a7a4026 
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  for (std::vector<MCDwarfFrameInfo>::iterator I = FrameInfos.begin(),
78         E = FrameInfos.end(); I != E; ++I)
79    I->CompactUnwindEncoding =
80      (MAB ? MAB->generateCompactUnwindEncoding(I->Instructions) : 0);
81}
82
83void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
84                                      const MCSymbol *Label, int PointerSize) {
85  // emit the sequence to set the address
86  EmitIntValue(dwarf::DW_LNS_extended_op, 1);
87  EmitULEB128IntValue(PointerSize + 1);
88  EmitIntValue(dwarf::DW_LNE_set_address, 1);
89  EmitSymbolValue(Label, PointerSize);
90
91  // emit the sequence for the LineDelta (from 1) and a zero address delta.
92  MCDwarfLineAddr::Emit(this, LineDelta, 0);
93}
94
95/// EmitIntValue - Special case of EmitValue that avoids the client having to
96/// pass in a MCExpr for constant integers.
97void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
98  assert(Size <= 8 && "Invalid size");
99  assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
100         "Invalid size");
101  char buf[8];
102  const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
103  for (unsigned i = 0; i != Size; ++i) {
104    unsigned index = isLittleEndian ? i : (Size - i - 1);
105    buf[i] = uint8_t(Value >> (index * 8));
106  }
107  EmitBytes(StringRef(buf, Size));
108}
109
110/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
111/// client having to pass in a MCExpr for constant integers.
112void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
113  SmallString<128> Tmp;
114  raw_svector_ostream OSE(Tmp);
115  encodeULEB128(Value, OSE, Padding);
116  EmitBytes(OSE.str());
117}
118
119/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
120/// client having to pass in a MCExpr for constant integers.
121void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
122  SmallString<128> Tmp;
123  raw_svector_ostream OSE(Tmp);
124  encodeSLEB128(Value, OSE);
125  EmitBytes(OSE.str());
126}
127
128void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
129  const MCExpr *ABS = ForceExpAbs(Value);
130  EmitValue(ABS, Size);
131}
132
133
134void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size) {
135  EmitValueImpl(Value, Size);
136}
137
138void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size) {
139  EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
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  const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
154  for (uint64_t i = 0, e = NumBytes; i != e; ++i)
155    EmitValue(E, 1);
156}
157
158/// The implementation in this class just redirects to EmitFill.
159void MCStreamer::EmitZeros(uint64_t NumBytes) {
160  EmitFill(NumBytes, 0);
161}
162
163bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
164                                        StringRef Directory,
165                                        StringRef Filename, unsigned CUID) {
166  return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID) == 0;
167}
168
169void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
170                                       unsigned Column, unsigned Flags,
171                                       unsigned Isa,
172                                       unsigned Discriminator,
173                                       StringRef FileName) {
174  getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
175                                  Discriminator);
176}
177
178MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
179  if (FrameInfos.empty())
180    return 0;
181  return &FrameInfos.back();
182}
183
184void MCStreamer::EnsureValidFrame() {
185  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
186  if (!CurFrame || CurFrame->End)
187    report_fatal_error("No open frame");
188}
189
190void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
191                                     MCSymbol *EHSymbol) {
192}
193
194void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) {
195  if (Section)
196    Symbol->setSection(*Section);
197  else
198    Symbol->setUndefined();
199
200  // As we emit symbols into a section, track the order so that they can
201  // be sorted upon later. Zero is reserved to mean 'unemitted'.
202  SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
203}
204
205void MCStreamer::EmitLabel(MCSymbol *Symbol) {
206  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
207  assert(getCurrentSection().first && "Cannot emit before setting section!");
208  AssignSection(Symbol, getCurrentSection().first);
209  LastSymbol = Symbol;
210}
211
212void MCStreamer::EmitDebugLabel(MCSymbol *Symbol) {
213  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
214  assert(getCurrentSection().first && "Cannot emit before setting section!");
215  AssignSection(Symbol, getCurrentSection().first);
216  LastSymbol = Symbol;
217}
218
219void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
220  EnsureValidFrame();
221  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
222  CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
223}
224
225void MCStreamer::EmitCFISections(bool EH, bool Debug) {
226  assert(EH || Debug);
227  EmitEHFrame = EH;
228  EmitDebugFrame = Debug;
229}
230
231void MCStreamer::EmitCFIStartProc() {
232  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
233  if (CurFrame && !CurFrame->End)
234    report_fatal_error("Starting a frame before finishing the previous one!");
235
236  MCDwarfFrameInfo Frame;
237  EmitCFIStartProcImpl(Frame);
238
239  FrameInfos.push_back(Frame);
240}
241
242void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
243}
244
245void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
246  Frame.Function = LastSymbol;
247  // If the function is externally visible, we need to create a local
248  // symbol to avoid relocations.
249  StringRef Prefix = getContext().getAsmInfo()->getPrivateGlobalPrefix();
250  if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
251    Frame.Begin = LastSymbol;
252  } else {
253    Frame.Begin = getContext().CreateTempSymbol();
254    EmitLabel(Frame.Begin);
255  }
256}
257
258void MCStreamer::EmitCFIEndProc() {
259  EnsureValidFrame();
260  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
261  EmitCFIEndProcImpl(*CurFrame);
262}
263
264void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
265}
266
267void MCStreamer::RecordProcEnd(MCDwarfFrameInfo &Frame) {
268  Frame.End = getContext().CreateTempSymbol();
269  EmitLabel(Frame.End);
270}
271
272MCSymbol *MCStreamer::EmitCFICommon() {
273  EnsureValidFrame();
274  MCSymbol *Label = getContext().CreateTempSymbol();
275  EmitLabel(Label);
276  return Label;
277}
278
279void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
280  MCSymbol *Label = EmitCFICommon();
281  MCCFIInstruction Instruction =
282    MCCFIInstruction::createDefCfa(Label, Register, Offset);
283  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
284  CurFrame->Instructions.push_back(Instruction);
285}
286
287void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
288  MCSymbol *Label = EmitCFICommon();
289  MCCFIInstruction Instruction =
290    MCCFIInstruction::createDefCfaOffset(Label, Offset);
291  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
292  CurFrame->Instructions.push_back(Instruction);
293}
294
295void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
296  MCSymbol *Label = EmitCFICommon();
297  MCCFIInstruction Instruction =
298    MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
299  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
300  CurFrame->Instructions.push_back(Instruction);
301}
302
303void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
304  MCSymbol *Label = EmitCFICommon();
305  MCCFIInstruction Instruction =
306    MCCFIInstruction::createDefCfaRegister(Label, Register);
307  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
308  CurFrame->Instructions.push_back(Instruction);
309}
310
311void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
312  MCSymbol *Label = EmitCFICommon();
313  MCCFIInstruction Instruction =
314    MCCFIInstruction::createOffset(Label, Register, Offset);
315  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
316  CurFrame->Instructions.push_back(Instruction);
317}
318
319void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
320  MCSymbol *Label = EmitCFICommon();
321  MCCFIInstruction Instruction =
322    MCCFIInstruction::createRelOffset(Label, Register, Offset);
323  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
324  CurFrame->Instructions.push_back(Instruction);
325}
326
327void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
328                                    unsigned Encoding) {
329  EnsureValidFrame();
330  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
331  CurFrame->Personality = Sym;
332  CurFrame->PersonalityEncoding = Encoding;
333}
334
335void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
336  EnsureValidFrame();
337  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
338  CurFrame->Lsda = Sym;
339  CurFrame->LsdaEncoding = Encoding;
340}
341
342void MCStreamer::EmitCFIRememberState() {
343  MCSymbol *Label = EmitCFICommon();
344  MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
345  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
346  CurFrame->Instructions.push_back(Instruction);
347}
348
349void MCStreamer::EmitCFIRestoreState() {
350  // FIXME: Error if there is no matching cfi_remember_state.
351  MCSymbol *Label = EmitCFICommon();
352  MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
353  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
354  CurFrame->Instructions.push_back(Instruction);
355}
356
357void MCStreamer::EmitCFISameValue(int64_t Register) {
358  MCSymbol *Label = EmitCFICommon();
359  MCCFIInstruction Instruction =
360    MCCFIInstruction::createSameValue(Label, Register);
361  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
362  CurFrame->Instructions.push_back(Instruction);
363}
364
365void MCStreamer::EmitCFIRestore(int64_t Register) {
366  MCSymbol *Label = EmitCFICommon();
367  MCCFIInstruction Instruction =
368    MCCFIInstruction::createRestore(Label, Register);
369  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
370  CurFrame->Instructions.push_back(Instruction);
371}
372
373void MCStreamer::EmitCFIEscape(StringRef Values) {
374  MCSymbol *Label = EmitCFICommon();
375  MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
376  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
377  CurFrame->Instructions.push_back(Instruction);
378}
379
380void MCStreamer::EmitCFISignalFrame() {
381  EnsureValidFrame();
382  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
383  CurFrame->IsSignalFrame = true;
384}
385
386void MCStreamer::EmitCFIUndefined(int64_t Register) {
387  MCSymbol *Label = EmitCFICommon();
388  MCCFIInstruction Instruction =
389    MCCFIInstruction::createUndefined(Label, Register);
390  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
391  CurFrame->Instructions.push_back(Instruction);
392}
393
394void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
395  MCSymbol *Label = EmitCFICommon();
396  MCCFIInstruction Instruction =
397    MCCFIInstruction::createRegister(Label, Register1, Register2);
398  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
399  CurFrame->Instructions.push_back(Instruction);
400}
401
402void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
403  W64UnwindInfos.push_back(Frame);
404  CurrentW64UnwindInfo = W64UnwindInfos.back();
405}
406
407void MCStreamer::EnsureValidW64UnwindInfo() {
408  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
409  if (!CurFrame || CurFrame->End)
410    report_fatal_error("No open Win64 EH frame function!");
411}
412
413void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
414  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
415  if (CurFrame && !CurFrame->End)
416    report_fatal_error("Starting a function before ending the previous one!");
417  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
418  Frame->Begin = getContext().CreateTempSymbol();
419  Frame->Function = Symbol;
420  EmitLabel(Frame->Begin);
421  setCurrentW64UnwindInfo(Frame);
422}
423
424void MCStreamer::EmitWin64EHEndProc() {
425  EnsureValidW64UnwindInfo();
426  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
427  if (CurFrame->ChainedParent)
428    report_fatal_error("Not all chained regions terminated!");
429  CurFrame->End = getContext().CreateTempSymbol();
430  EmitLabel(CurFrame->End);
431}
432
433void MCStreamer::EmitWin64EHStartChained() {
434  EnsureValidW64UnwindInfo();
435  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
436  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
437  Frame->Begin = getContext().CreateTempSymbol();
438  Frame->Function = CurFrame->Function;
439  Frame->ChainedParent = CurFrame;
440  EmitLabel(Frame->Begin);
441  setCurrentW64UnwindInfo(Frame);
442}
443
444void MCStreamer::EmitWin64EHEndChained() {
445  EnsureValidW64UnwindInfo();
446  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
447  if (!CurFrame->ChainedParent)
448    report_fatal_error("End of a chained region outside a chained region!");
449  CurFrame->End = getContext().CreateTempSymbol();
450  EmitLabel(CurFrame->End);
451  CurrentW64UnwindInfo = CurFrame->ChainedParent;
452}
453
454void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
455                                    bool Except) {
456  EnsureValidW64UnwindInfo();
457  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
458  if (CurFrame->ChainedParent)
459    report_fatal_error("Chained unwind areas can't have handlers!");
460  CurFrame->ExceptionHandler = Sym;
461  if (!Except && !Unwind)
462    report_fatal_error("Don't know what kind of handler this is!");
463  if (Unwind)
464    CurFrame->HandlesUnwind = true;
465  if (Except)
466    CurFrame->HandlesExceptions = true;
467}
468
469void MCStreamer::EmitWin64EHHandlerData() {
470  EnsureValidW64UnwindInfo();
471  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
472  if (CurFrame->ChainedParent)
473    report_fatal_error("Chained unwind areas can't have handlers!");
474}
475
476void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
477  EnsureValidW64UnwindInfo();
478  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
479  MCSymbol *Label = getContext().CreateTempSymbol();
480  MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
481  EmitLabel(Label);
482  CurFrame->Instructions.push_back(Inst);
483}
484
485void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
486  EnsureValidW64UnwindInfo();
487  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
488  if (CurFrame->LastFrameInst >= 0)
489    report_fatal_error("Frame register and offset already specified!");
490  if (Offset & 0x0F)
491    report_fatal_error("Misaligned frame pointer offset!");
492  MCSymbol *Label = getContext().CreateTempSymbol();
493  MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, Label, Register, Offset);
494  EmitLabel(Label);
495  CurFrame->LastFrameInst = CurFrame->Instructions.size();
496  CurFrame->Instructions.push_back(Inst);
497}
498
499void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
500  EnsureValidW64UnwindInfo();
501  if (Size & 7)
502    report_fatal_error("Misaligned stack allocation!");
503  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
504  MCSymbol *Label = getContext().CreateTempSymbol();
505  MCWin64EHInstruction Inst(Label, Size);
506  EmitLabel(Label);
507  CurFrame->Instructions.push_back(Inst);
508}
509
510void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
511  EnsureValidW64UnwindInfo();
512  if (Offset & 7)
513    report_fatal_error("Misaligned saved register offset!");
514  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
515  MCSymbol *Label = getContext().CreateTempSymbol();
516  MCWin64EHInstruction Inst(
517     Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
518                            Label, Register, Offset);
519  EmitLabel(Label);
520  CurFrame->Instructions.push_back(Inst);
521}
522
523void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
524  EnsureValidW64UnwindInfo();
525  if (Offset & 0x0F)
526    report_fatal_error("Misaligned saved vector register offset!");
527  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
528  MCSymbol *Label = getContext().CreateTempSymbol();
529  MCWin64EHInstruction Inst(
530    Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
531                            Label, Register, Offset);
532  EmitLabel(Label);
533  CurFrame->Instructions.push_back(Inst);
534}
535
536void MCStreamer::EmitWin64EHPushFrame(bool Code) {
537  EnsureValidW64UnwindInfo();
538  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
539  if (CurFrame->Instructions.size() > 0)
540    report_fatal_error("If present, PushMachFrame must be the first UOP");
541  MCSymbol *Label = getContext().CreateTempSymbol();
542  MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
543  EmitLabel(Label);
544  CurFrame->Instructions.push_back(Inst);
545}
546
547void MCStreamer::EmitWin64EHEndProlog() {
548  EnsureValidW64UnwindInfo();
549  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
550  CurFrame->PrologEnd = getContext().CreateTempSymbol();
551  EmitLabel(CurFrame->PrologEnd);
552}
553
554void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
555  llvm_unreachable("This file format doesn't support this directive");
556}
557
558void MCStreamer::EmitFnStart() {
559  errs() << "Not implemented yet\n";
560  abort();
561}
562
563void MCStreamer::EmitFnEnd() {
564  errs() << "Not implemented yet\n";
565  abort();
566}
567
568void MCStreamer::EmitCantUnwind() {
569  errs() << "Not implemented yet\n";
570  abort();
571}
572
573void MCStreamer::EmitHandlerData() {
574  errs() << "Not implemented yet\n";
575  abort();
576}
577
578void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
579  errs() << "Not implemented yet\n";
580  abort();
581}
582
583void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
584  errs() << "Not implemented yet\n";
585  abort();
586}
587
588void MCStreamer::EmitPad(int64_t Offset) {
589  errs() << "Not implemented yet\n";
590  abort();
591}
592
593void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
594  errs() << "Not implemented yet\n";
595  abort();
596}
597
598void MCStreamer::EmitTCEntry(const MCSymbol &S) {
599  llvm_unreachable("Unsupported method");
600}
601
602/// EmitRawText - If this file is backed by an assembly streamer, this dumps
603/// the specified string in the output .s file.  This capability is
604/// indicated by the hasRawTextSupport() predicate.
605void MCStreamer::EmitRawText(StringRef String) {
606  errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
607  " something must not be fully mc'ized\n";
608  abort();
609}
610
611void MCStreamer::EmitRawText(const Twine &T) {
612  SmallString<128> Str;
613  T.toVector(Str);
614  EmitRawText(Str.str());
615}
616
617void MCStreamer::EmitFrames(MCAsmBackend *MAB, bool usingCFI) {
618  if (!getNumFrameInfos())
619    return;
620
621  if (EmitEHFrame)
622    MCDwarfFrameEmitter::Emit(*this, MAB, usingCFI, true);
623
624  if (EmitDebugFrame)
625    MCDwarfFrameEmitter::Emit(*this, MAB, usingCFI, false);
626}
627
628void MCStreamer::EmitW64Tables() {
629  if (!getNumW64UnwindInfos())
630    return;
631
632  MCWin64EHUnwindEmitter::Emit(*this);
633}
634
635void MCStreamer::Finish() {
636  if (!FrameInfos.empty() && !FrameInfos.back().End)
637    report_fatal_error("Unfinished frame!");
638
639  FinishImpl();
640}
641
642MCSymbolData &MCStreamer::getOrCreateSymbolData(MCSymbol *Symbol) {
643  report_fatal_error("Not supported!");
644  return *(static_cast<MCSymbolData*>(0));
645}
646