MCStreamer.cpp revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
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/MCObjectFileInfo.h"
18#include "llvm/MC/MCObjectWriter.h"
19#include "llvm/MC/MCSymbol.h"
20#include "llvm/Support/ErrorHandling.h"
21#include "llvm/Support/LEB128.h"
22#include "llvm/Support/raw_ostream.h"
23#include <cstdlib>
24using namespace llvm;
25
26// Pin the vtables to this file.
27MCTargetStreamer::~MCTargetStreamer() {}
28
29MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {
30  S.setTargetStreamer(this);
31}
32
33void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
34
35void MCTargetStreamer::finish() {}
36
37void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
38
39MCStreamer::MCStreamer(MCContext &Ctx)
40    : Context(Ctx), EmitEHFrame(true), EmitDebugFrame(false),
41      CurrentW64UnwindInfo(0), LastSymbol(0) {
42  SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
43}
44
45MCStreamer::~MCStreamer() {
46  for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
47    delete W64UnwindInfos[i];
48}
49
50void MCStreamer::reset() {
51  for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
52    delete W64UnwindInfos[i];
53  W64UnwindInfos.clear();
54  EmitEHFrame = true;
55  EmitDebugFrame = false;
56  CurrentW64UnwindInfo = 0;
57  LastSymbol = 0;
58  SectionStack.clear();
59  SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
60}
61
62const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
63                                          const MCSymbol *A,
64                                          const MCSymbol *B) {
65  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
66  const MCExpr *ARef =
67    MCSymbolRefExpr::Create(A, Variant, Context);
68  const MCExpr *BRef =
69    MCSymbolRefExpr::Create(B, Variant, Context);
70  const MCExpr *AddrDelta =
71    MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
72  return AddrDelta;
73}
74
75const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
76  assert(!isa<MCSymbolRefExpr>(Expr));
77  if (Context.getAsmInfo()->hasAggressiveSymbolFolding())
78    return Expr;
79
80  MCSymbol *ABS = Context.CreateTempSymbol();
81  EmitAssignment(ABS, Expr);
82  return MCSymbolRefExpr::Create(ABS, Context);
83}
84
85raw_ostream &MCStreamer::GetCommentOS() {
86  // By default, discard comments.
87  return nulls();
88}
89
90void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
91
92void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
93  for (std::vector<MCDwarfFrameInfo>::iterator I = FrameInfos.begin(),
94         E = FrameInfos.end(); I != E; ++I)
95    I->CompactUnwindEncoding =
96      (MAB ? MAB->generateCompactUnwindEncoding(I->Instructions) : 0);
97}
98
99void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
100                                      const MCSymbol *Label, int PointerSize) {
101  // emit the sequence to set the address
102  EmitIntValue(dwarf::DW_LNS_extended_op, 1);
103  EmitULEB128IntValue(PointerSize + 1);
104  EmitIntValue(dwarf::DW_LNE_set_address, 1);
105  EmitSymbolValue(Label, PointerSize);
106
107  // emit the sequence for the LineDelta (from 1) and a zero address delta.
108  MCDwarfLineAddr::Emit(this, LineDelta, 0);
109}
110
111/// EmitIntValue - Special case of EmitValue that avoids the client having to
112/// pass in a MCExpr for constant integers.
113void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
114  assert(Size <= 8 && "Invalid size");
115  assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
116         "Invalid size");
117  char buf[8];
118  const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
119  for (unsigned i = 0; i != Size; ++i) {
120    unsigned index = isLittleEndian ? i : (Size - i - 1);
121    buf[i] = uint8_t(Value >> (index * 8));
122  }
123  EmitBytes(StringRef(buf, Size));
124}
125
126/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
127/// client having to pass in a MCExpr for constant integers.
128void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
129  SmallString<128> Tmp;
130  raw_svector_ostream OSE(Tmp);
131  encodeULEB128(Value, OSE, Padding);
132  EmitBytes(OSE.str());
133}
134
135/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
136/// client having to pass in a MCExpr for constant integers.
137void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
138  SmallString<128> Tmp;
139  raw_svector_ostream OSE(Tmp);
140  encodeSLEB128(Value, OSE);
141  EmitBytes(OSE.str());
142}
143
144void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
145  const MCExpr *ABS = ForceExpAbs(Value);
146  EmitValue(ABS, Size);
147}
148
149
150void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size) {
151  EmitValueImpl(Value, Size);
152}
153
154void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size) {
155  EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
156}
157
158void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
159  report_fatal_error("unsupported directive in streamer");
160}
161
162void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
163  report_fatal_error("unsupported directive in streamer");
164}
165
166/// EmitFill - Emit NumBytes bytes worth of the value specified by
167/// FillValue.  This implements directives such as '.space'.
168void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
169  const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
170  for (uint64_t i = 0, e = NumBytes; i != e; ++i)
171    EmitValue(E, 1);
172}
173
174/// The implementation in this class just redirects to EmitFill.
175void MCStreamer::EmitZeros(uint64_t NumBytes) {
176  EmitFill(NumBytes, 0);
177}
178
179unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
180                                            StringRef Directory,
181                                            StringRef Filename, unsigned CUID) {
182  return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID);
183}
184
185void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
186                                       unsigned Column, unsigned Flags,
187                                       unsigned Isa,
188                                       unsigned Discriminator,
189                                       StringRef FileName) {
190  getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
191                                  Discriminator);
192}
193
194MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
195  MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
196  if (!Table.getLabel()) {
197    StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
198    Table.setLabel(
199        Context.GetOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
200  }
201  return Table.getLabel();
202}
203
204MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
205  if (FrameInfos.empty())
206    return 0;
207  return &FrameInfos.back();
208}
209
210void MCStreamer::EnsureValidFrame() {
211  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
212  if (!CurFrame || CurFrame->End)
213    report_fatal_error("No open frame");
214}
215
216void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
217                                     MCSymbol *EHSymbol) {
218}
219
220void MCStreamer::InitSections() {
221  SwitchSection(getContext().getObjectFileInfo()->getTextSection());
222}
223
224void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) {
225  if (Section)
226    Symbol->setSection(*Section);
227  else
228    Symbol->setUndefined();
229
230  // As we emit symbols into a section, track the order so that they can
231  // be sorted upon later. Zero is reserved to mean 'unemitted'.
232  SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
233}
234
235void MCStreamer::EmitLabel(MCSymbol *Symbol) {
236  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
237  assert(getCurrentSection().first && "Cannot emit before setting section!");
238  AssignSection(Symbol, getCurrentSection().first);
239  LastSymbol = Symbol;
240
241  MCTargetStreamer *TS = getTargetStreamer();
242  if (TS)
243    TS->emitLabel(Symbol);
244}
245
246void MCStreamer::EmitDebugLabel(MCSymbol *Symbol) {
247  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
248  assert(getCurrentSection().first && "Cannot emit before setting section!");
249  AssignSection(Symbol, getCurrentSection().first);
250  LastSymbol = Symbol;
251}
252
253void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
254  EnsureValidFrame();
255  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
256  CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
257}
258
259void MCStreamer::EmitCFISections(bool EH, bool Debug) {
260  assert(EH || Debug);
261  EmitEHFrame = EH;
262  EmitDebugFrame = Debug;
263}
264
265void MCStreamer::EmitCFIStartProc(bool IsSimple) {
266  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
267  if (CurFrame && !CurFrame->End)
268    report_fatal_error("Starting a frame before finishing the previous one!");
269
270  MCDwarfFrameInfo Frame;
271  Frame.IsSimple = IsSimple;
272  EmitCFIStartProcImpl(Frame);
273
274  FrameInfos.push_back(Frame);
275}
276
277void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
278}
279
280void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
281  Frame.Function = LastSymbol;
282  // We need to create a local symbol to avoid relocations.
283  Frame.Begin = getContext().CreateTempSymbol();
284  EmitLabel(Frame.Begin);
285}
286
287void MCStreamer::EmitCFIEndProc() {
288  EnsureValidFrame();
289  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
290  EmitCFIEndProcImpl(*CurFrame);
291}
292
293void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
294}
295
296void MCStreamer::RecordProcEnd(MCDwarfFrameInfo &Frame) {
297  Frame.End = getContext().CreateTempSymbol();
298  EmitLabel(Frame.End);
299}
300
301MCSymbol *MCStreamer::EmitCFICommon() {
302  EnsureValidFrame();
303  MCSymbol *Label = getContext().CreateTempSymbol();
304  EmitLabel(Label);
305  return Label;
306}
307
308void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
309  MCSymbol *Label = EmitCFICommon();
310  MCCFIInstruction Instruction =
311    MCCFIInstruction::createDefCfa(Label, Register, Offset);
312  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
313  CurFrame->Instructions.push_back(Instruction);
314}
315
316void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
317  MCSymbol *Label = EmitCFICommon();
318  MCCFIInstruction Instruction =
319    MCCFIInstruction::createDefCfaOffset(Label, Offset);
320  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
321  CurFrame->Instructions.push_back(Instruction);
322}
323
324void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
325  MCSymbol *Label = EmitCFICommon();
326  MCCFIInstruction Instruction =
327    MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
328  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
329  CurFrame->Instructions.push_back(Instruction);
330}
331
332void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
333  MCSymbol *Label = EmitCFICommon();
334  MCCFIInstruction Instruction =
335    MCCFIInstruction::createDefCfaRegister(Label, Register);
336  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
337  CurFrame->Instructions.push_back(Instruction);
338}
339
340void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
341  MCSymbol *Label = EmitCFICommon();
342  MCCFIInstruction Instruction =
343    MCCFIInstruction::createOffset(Label, Register, Offset);
344  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
345  CurFrame->Instructions.push_back(Instruction);
346}
347
348void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
349  MCSymbol *Label = EmitCFICommon();
350  MCCFIInstruction Instruction =
351    MCCFIInstruction::createRelOffset(Label, Register, Offset);
352  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
353  CurFrame->Instructions.push_back(Instruction);
354}
355
356void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
357                                    unsigned Encoding) {
358  EnsureValidFrame();
359  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
360  CurFrame->Personality = Sym;
361  CurFrame->PersonalityEncoding = Encoding;
362}
363
364void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
365  EnsureValidFrame();
366  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
367  CurFrame->Lsda = Sym;
368  CurFrame->LsdaEncoding = Encoding;
369}
370
371void MCStreamer::EmitCFIRememberState() {
372  MCSymbol *Label = EmitCFICommon();
373  MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
374  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
375  CurFrame->Instructions.push_back(Instruction);
376}
377
378void MCStreamer::EmitCFIRestoreState() {
379  // FIXME: Error if there is no matching cfi_remember_state.
380  MCSymbol *Label = EmitCFICommon();
381  MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
382  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
383  CurFrame->Instructions.push_back(Instruction);
384}
385
386void MCStreamer::EmitCFISameValue(int64_t Register) {
387  MCSymbol *Label = EmitCFICommon();
388  MCCFIInstruction Instruction =
389    MCCFIInstruction::createSameValue(Label, Register);
390  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
391  CurFrame->Instructions.push_back(Instruction);
392}
393
394void MCStreamer::EmitCFIRestore(int64_t Register) {
395  MCSymbol *Label = EmitCFICommon();
396  MCCFIInstruction Instruction =
397    MCCFIInstruction::createRestore(Label, Register);
398  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
399  CurFrame->Instructions.push_back(Instruction);
400}
401
402void MCStreamer::EmitCFIEscape(StringRef Values) {
403  MCSymbol *Label = EmitCFICommon();
404  MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
405  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
406  CurFrame->Instructions.push_back(Instruction);
407}
408
409void MCStreamer::EmitCFISignalFrame() {
410  EnsureValidFrame();
411  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
412  CurFrame->IsSignalFrame = true;
413}
414
415void MCStreamer::EmitCFIUndefined(int64_t Register) {
416  MCSymbol *Label = EmitCFICommon();
417  MCCFIInstruction Instruction =
418    MCCFIInstruction::createUndefined(Label, Register);
419  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
420  CurFrame->Instructions.push_back(Instruction);
421}
422
423void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
424  MCSymbol *Label = EmitCFICommon();
425  MCCFIInstruction Instruction =
426    MCCFIInstruction::createRegister(Label, Register1, Register2);
427  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
428  CurFrame->Instructions.push_back(Instruction);
429}
430
431void MCStreamer::EmitCFIWindowSave() {
432  MCSymbol *Label = EmitCFICommon();
433  MCCFIInstruction Instruction =
434    MCCFIInstruction::createWindowSave(Label);
435  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
436  CurFrame->Instructions.push_back(Instruction);
437}
438
439void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
440  W64UnwindInfos.push_back(Frame);
441  CurrentW64UnwindInfo = W64UnwindInfos.back();
442}
443
444void MCStreamer::EnsureValidW64UnwindInfo() {
445  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
446  if (!CurFrame || CurFrame->End)
447    report_fatal_error("No open Win64 EH frame function!");
448}
449
450void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
451  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
452  if (CurFrame && !CurFrame->End)
453    report_fatal_error("Starting a function before ending the previous one!");
454  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
455  Frame->Begin = getContext().CreateTempSymbol();
456  Frame->Function = Symbol;
457  EmitLabel(Frame->Begin);
458  setCurrentW64UnwindInfo(Frame);
459}
460
461void MCStreamer::EmitWin64EHEndProc() {
462  EnsureValidW64UnwindInfo();
463  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
464  if (CurFrame->ChainedParent)
465    report_fatal_error("Not all chained regions terminated!");
466  CurFrame->End = getContext().CreateTempSymbol();
467  EmitLabel(CurFrame->End);
468}
469
470void MCStreamer::EmitWin64EHStartChained() {
471  EnsureValidW64UnwindInfo();
472  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
473  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
474  Frame->Begin = getContext().CreateTempSymbol();
475  Frame->Function = CurFrame->Function;
476  Frame->ChainedParent = CurFrame;
477  EmitLabel(Frame->Begin);
478  setCurrentW64UnwindInfo(Frame);
479}
480
481void MCStreamer::EmitWin64EHEndChained() {
482  EnsureValidW64UnwindInfo();
483  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
484  if (!CurFrame->ChainedParent)
485    report_fatal_error("End of a chained region outside a chained region!");
486  CurFrame->End = getContext().CreateTempSymbol();
487  EmitLabel(CurFrame->End);
488  CurrentW64UnwindInfo = CurFrame->ChainedParent;
489}
490
491void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
492                                    bool Except) {
493  EnsureValidW64UnwindInfo();
494  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
495  if (CurFrame->ChainedParent)
496    report_fatal_error("Chained unwind areas can't have handlers!");
497  CurFrame->ExceptionHandler = Sym;
498  if (!Except && !Unwind)
499    report_fatal_error("Don't know what kind of handler this is!");
500  if (Unwind)
501    CurFrame->HandlesUnwind = true;
502  if (Except)
503    CurFrame->HandlesExceptions = true;
504}
505
506void MCStreamer::EmitWin64EHHandlerData() {
507  EnsureValidW64UnwindInfo();
508  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
509  if (CurFrame->ChainedParent)
510    report_fatal_error("Chained unwind areas can't have handlers!");
511}
512
513void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
514  EnsureValidW64UnwindInfo();
515  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
516  MCSymbol *Label = getContext().CreateTempSymbol();
517  MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
518  EmitLabel(Label);
519  CurFrame->Instructions.push_back(Inst);
520}
521
522void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
523  EnsureValidW64UnwindInfo();
524  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
525  if (CurFrame->LastFrameInst >= 0)
526    report_fatal_error("Frame register and offset already specified!");
527  if (Offset & 0x0F)
528    report_fatal_error("Misaligned frame pointer offset!");
529  MCSymbol *Label = getContext().CreateTempSymbol();
530  MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, Label, Register, Offset);
531  EmitLabel(Label);
532  CurFrame->LastFrameInst = CurFrame->Instructions.size();
533  CurFrame->Instructions.push_back(Inst);
534}
535
536void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
537  EnsureValidW64UnwindInfo();
538  if (Size & 7)
539    report_fatal_error("Misaligned stack allocation!");
540  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
541  MCSymbol *Label = getContext().CreateTempSymbol();
542  MCWin64EHInstruction Inst(Label, Size);
543  EmitLabel(Label);
544  CurFrame->Instructions.push_back(Inst);
545}
546
547void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
548  EnsureValidW64UnwindInfo();
549  if (Offset & 7)
550    report_fatal_error("Misaligned saved register offset!");
551  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
552  MCSymbol *Label = getContext().CreateTempSymbol();
553  MCWin64EHInstruction Inst(
554     Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
555                            Label, Register, Offset);
556  EmitLabel(Label);
557  CurFrame->Instructions.push_back(Inst);
558}
559
560void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
561  EnsureValidW64UnwindInfo();
562  if (Offset & 0x0F)
563    report_fatal_error("Misaligned saved vector register offset!");
564  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
565  MCSymbol *Label = getContext().CreateTempSymbol();
566  MCWin64EHInstruction Inst(
567    Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
568                            Label, Register, Offset);
569  EmitLabel(Label);
570  CurFrame->Instructions.push_back(Inst);
571}
572
573void MCStreamer::EmitWin64EHPushFrame(bool Code) {
574  EnsureValidW64UnwindInfo();
575  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
576  if (CurFrame->Instructions.size() > 0)
577    report_fatal_error("If present, PushMachFrame must be the first UOP");
578  MCSymbol *Label = getContext().CreateTempSymbol();
579  MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
580  EmitLabel(Label);
581  CurFrame->Instructions.push_back(Inst);
582}
583
584void MCStreamer::EmitWin64EHEndProlog() {
585  EnsureValidW64UnwindInfo();
586  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
587  CurFrame->PrologEnd = getContext().CreateTempSymbol();
588  EmitLabel(CurFrame->PrologEnd);
589}
590
591void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
592  llvm_unreachable("This file format doesn't support this directive");
593}
594
595void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
596  llvm_unreachable("This file format doesn't support this directive");
597}
598
599/// EmitRawText - If this file is backed by an assembly streamer, this dumps
600/// the specified string in the output .s file.  This capability is
601/// indicated by the hasRawTextSupport() predicate.
602void MCStreamer::EmitRawTextImpl(StringRef String) {
603  errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
604  " something must not be fully mc'ized\n";
605  abort();
606}
607
608void MCStreamer::EmitRawText(const Twine &T) {
609  SmallString<128> Str;
610  EmitRawTextImpl(T.toStringRef(Str));
611}
612
613void MCStreamer::EmitFrames(MCAsmBackend *MAB, bool usingCFI) {
614  if (!getNumFrameInfos())
615    return;
616
617  if (EmitEHFrame)
618    MCDwarfFrameEmitter::Emit(*this, MAB, usingCFI, true);
619
620  if (EmitDebugFrame)
621    MCDwarfFrameEmitter::Emit(*this, MAB, usingCFI, false);
622}
623
624void MCStreamer::EmitW64Tables() {
625  if (!getNumW64UnwindInfos())
626    return;
627
628  MCWin64EHUnwindEmitter::Emit(*this);
629}
630
631void MCStreamer::Finish() {
632  if (!FrameInfos.empty() && !FrameInfos.back().End)
633    report_fatal_error("Unfinished frame!");
634
635  MCTargetStreamer *TS = getTargetStreamer();
636  if (TS)
637    TS->finish();
638
639  FinishImpl();
640}
641
642MCSymbolData &MCStreamer::getOrCreateSymbolData(const MCSymbol *Symbol) {
643  report_fatal_error("Not supported!");
644  return *(static_cast<MCSymbolData*>(0));
645}
646
647void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
648  Symbol->setVariableValue(Value);
649
650  MCTargetStreamer *TS = getTargetStreamer();
651  if (TS)
652    TS->emitAssignment(Symbol, Value);
653}
654