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