MCAsmStreamer.cpp revision 206083 
1//===- lib/MC/MCAsmStreamer.cpp - Text Assembly 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/MC/MCAsmInfo.h"
12#include "llvm/MC/MCCodeEmitter.h"
13#include "llvm/MC/MCContext.h"
14#include "llvm/MC/MCExpr.h"
15#include "llvm/MC/MCInst.h"
16#include "llvm/MC/MCInstPrinter.h"
17#include "llvm/MC/MCSectionMachO.h"
18#include "llvm/MC/MCSymbol.h"
19#include "llvm/ADT/OwningPtr.h"
20#include "llvm/ADT/SmallString.h"
21#include "llvm/ADT/Twine.h"
22#include "llvm/Support/ErrorHandling.h"
23#include "llvm/Support/MathExtras.h"
24#include "llvm/Support/Format.h"
25#include "llvm/Support/FormattedStream.h"
26using namespace llvm;
27
28namespace {
29
30class MCAsmStreamer : public MCStreamer {
31  formatted_raw_ostream &OS;
32  const MCAsmInfo &MAI;
33  OwningPtr<MCInstPrinter> InstPrinter;
34  MCCodeEmitter *Emitter;
35
36  SmallString<128> CommentToEmit;
37  raw_svector_ostream CommentStream;
38
39  unsigned IsLittleEndian : 1;
40  unsigned IsVerboseAsm : 1;
41  unsigned ShowInst : 1;
42
43public:
44  MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
45                bool isLittleEndian, bool isVerboseAsm, MCInstPrinter *printer,
46                MCCodeEmitter *emitter, bool showInst)
47    : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
48      InstPrinter(printer), Emitter(emitter), CommentStream(CommentToEmit),
49      IsLittleEndian(isLittleEndian), IsVerboseAsm(isVerboseAsm),
50      ShowInst(showInst) {
51    if (InstPrinter && IsVerboseAsm)
52      InstPrinter->setCommentStream(CommentStream);
53  }
54  ~MCAsmStreamer() {}
55
56  bool isLittleEndian() const { return IsLittleEndian; }
57
58  inline void EmitEOL() {
59    // If we don't have any comments, just emit a \n.
60    if (!IsVerboseAsm) {
61      OS << '\n';
62      return;
63    }
64    EmitCommentsAndEOL();
65  }
66  void EmitCommentsAndEOL();
67
68  /// isVerboseAsm - Return true if this streamer supports verbose assembly at
69  /// all.
70  virtual bool isVerboseAsm() const { return IsVerboseAsm; }
71
72  /// AddComment - Add a comment that can be emitted to the generated .s
73  /// file if applicable as a QoI issue to make the output of the compiler
74  /// more readable.  This only affects the MCAsmStreamer, and only when
75  /// verbose assembly output is enabled.
76  virtual void AddComment(const Twine &T);
77
78  /// AddEncodingComment - Add a comment showing the encoding of an instruction.
79  virtual void AddEncodingComment(const MCInst &Inst);
80
81  /// GetCommentOS - Return a raw_ostream that comments can be written to.
82  /// Unlike AddComment, you are required to terminate comments with \n if you
83  /// use this method.
84  virtual raw_ostream &GetCommentOS() {
85    if (!IsVerboseAsm)
86      return nulls();  // Discard comments unless in verbose asm mode.
87    return CommentStream;
88  }
89
90  /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
91  virtual void AddBlankLine() {
92    EmitEOL();
93  }
94
95  /// @name MCStreamer Interface
96  /// @{
97
98  virtual void SwitchSection(const MCSection *Section);
99
100  virtual void EmitLabel(MCSymbol *Symbol);
101
102  virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
103
104  virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
105
106  virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
107
108  virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
109
110  virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
111  virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
112                                unsigned ByteAlignment);
113
114  /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
115  ///
116  /// @param Symbol - The common symbol to emit.
117  /// @param Size - The size of the common symbol.
118  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
119
120  virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
121                            unsigned Size = 0, unsigned ByteAlignment = 0);
122
123  virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
124
125  virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
126  virtual void EmitIntValue(uint64_t Value, unsigned Size, unsigned AddrSpace);
127  virtual void EmitGPRel32Value(const MCExpr *Value);
128
129
130  virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
131                        unsigned AddrSpace);
132
133  virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
134                                    unsigned ValueSize = 1,
135                                    unsigned MaxBytesToEmit = 0);
136
137  virtual void EmitCodeAlignment(unsigned ByteAlignment,
138                                 unsigned MaxBytesToEmit = 0);
139
140  virtual void EmitValueToOffset(const MCExpr *Offset,
141                                 unsigned char Value = 0);
142
143  virtual void EmitFileDirective(StringRef Filename);
144  virtual void EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
145
146  virtual void EmitInstruction(const MCInst &Inst);
147
148  virtual void Finish();
149
150  /// @}
151};
152
153} // end anonymous namespace.
154
155/// AddComment - Add a comment that can be emitted to the generated .s
156/// file if applicable as a QoI issue to make the output of the compiler
157/// more readable.  This only affects the MCAsmStreamer, and only when
158/// verbose assembly output is enabled.
159void MCAsmStreamer::AddComment(const Twine &T) {
160  if (!IsVerboseAsm) return;
161
162  // Make sure that CommentStream is flushed.
163  CommentStream.flush();
164
165  T.toVector(CommentToEmit);
166  // Each comment goes on its own line.
167  CommentToEmit.push_back('\n');
168
169  // Tell the comment stream that the vector changed underneath it.
170  CommentStream.resync();
171}
172
173void MCAsmStreamer::EmitCommentsAndEOL() {
174  if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
175    OS << '\n';
176    return;
177  }
178
179  CommentStream.flush();
180  StringRef Comments = CommentToEmit.str();
181
182  assert(Comments.back() == '\n' &&
183         "Comment array not newline terminated");
184  do {
185    // Emit a line of comments.
186    OS.PadToColumn(MAI.getCommentColumn());
187    size_t Position = Comments.find('\n');
188    OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
189
190    Comments = Comments.substr(Position+1);
191  } while (!Comments.empty());
192
193  CommentToEmit.clear();
194  // Tell the comment stream that the vector changed underneath it.
195  CommentStream.resync();
196}
197
198
199static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
200  assert(Bytes && "Invalid size!");
201  return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
202}
203
204void MCAsmStreamer::SwitchSection(const MCSection *Section) {
205  assert(Section && "Cannot switch to a null section!");
206  if (Section != CurSection) {
207    CurSection = Section;
208    Section->PrintSwitchToSection(MAI, OS);
209  }
210}
211
212void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
213  assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
214  assert(CurSection && "Cannot emit before setting section!");
215
216  OS << *Symbol << ":";
217  EmitEOL();
218  Symbol->setSection(*CurSection);
219}
220
221void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
222  switch (Flag) {
223  default: assert(0 && "Invalid flag!");
224  case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
225  }
226  EmitEOL();
227}
228
229void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
230  // Only absolute symbols can be redefined.
231  assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
232         "Cannot define a symbol twice!");
233
234  OS << *Symbol << " = " << *Value;
235  EmitEOL();
236
237  // FIXME: Lift context changes into super class.
238  // FIXME: Set associated section.
239  Symbol->setValue(Value);
240}
241
242void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
243                                        MCSymbolAttr Attribute) {
244  switch (Attribute) {
245  case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
246  case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
247  case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
248  case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
249  case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
250  case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
251  case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
252    assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
253    OS << "\t.type\t" << *Symbol << ','
254       << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
255    switch (Attribute) {
256    default: assert(0 && "Unknown ELF .type");
257    case MCSA_ELF_TypeFunction:    OS << "function"; break;
258    case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
259    case MCSA_ELF_TypeObject:      OS << "object"; break;
260    case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
261    case MCSA_ELF_TypeCommon:      OS << "common"; break;
262    case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
263    }
264    EmitEOL();
265    return;
266  case MCSA_Global: // .globl/.global
267    OS << MAI.getGlobalDirective();
268    break;
269  case MCSA_Hidden:         OS << ".hidden ";          break;
270  case MCSA_IndirectSymbol: OS << ".indirect_symbol "; break;
271  case MCSA_Internal:       OS << ".internal ";        break;
272  case MCSA_LazyReference:  OS << ".lazy_reference ";  break;
273  case MCSA_Local:          OS << ".local ";           break;
274  case MCSA_NoDeadStrip:    OS << ".no_dead_strip ";   break;
275  case MCSA_PrivateExtern:  OS << ".private_extern ";  break;
276  case MCSA_Protected:      OS << ".protected ";       break;
277  case MCSA_Reference:      OS << ".reference ";       break;
278  case MCSA_Weak:           OS << ".weak ";            break;
279  case MCSA_WeakDefinition: OS << ".weak_definition "; break;
280      // .weak_reference
281  case MCSA_WeakReference:  OS << MAI.getWeakRefDirective(); break;
282  }
283
284  OS << *Symbol;
285  EmitEOL();
286}
287
288void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
289  OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
290  EmitEOL();
291}
292
293void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
294  assert(MAI.hasDotTypeDotSizeDirective());
295  OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
296}
297
298void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
299                                     unsigned ByteAlignment) {
300  OS << "\t.comm\t" << *Symbol << ',' << Size;
301  if (ByteAlignment != 0) {
302    if (MAI.getCOMMDirectiveAlignmentIsInBytes())
303      OS << ',' << ByteAlignment;
304    else
305      OS << ',' << Log2_32(ByteAlignment);
306  }
307  EmitEOL();
308}
309
310/// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
311///
312/// @param Symbol - The common symbol to emit.
313/// @param Size - The size of the common symbol.
314void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
315  assert(MAI.hasLCOMMDirective() && "Doesn't have .lcomm, can't emit it!");
316  OS << "\t.lcomm\t" << *Symbol << ',' << Size;
317  EmitEOL();
318}
319
320void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
321                                 unsigned Size, unsigned ByteAlignment) {
322  // Note: a .zerofill directive does not switch sections.
323  OS << ".zerofill ";
324
325  // This is a mach-o specific directive.
326  const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
327  OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
328
329  if (Symbol != NULL) {
330    OS << ',' << *Symbol << ',' << Size;
331    if (ByteAlignment != 0)
332      OS << ',' << Log2_32(ByteAlignment);
333  }
334  EmitEOL();
335}
336
337static inline char toOctal(int X) { return (X&7)+'0'; }
338
339static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
340  OS << '"';
341
342  for (unsigned i = 0, e = Data.size(); i != e; ++i) {
343    unsigned char C = Data[i];
344    if (C == '"' || C == '\\') {
345      OS << '\\' << (char)C;
346      continue;
347    }
348
349    if (isprint((unsigned char)C)) {
350      OS << (char)C;
351      continue;
352    }
353
354    switch (C) {
355      case '\b': OS << "\\b"; break;
356      case '\f': OS << "\\f"; break;
357      case '\n': OS << "\\n"; break;
358      case '\r': OS << "\\r"; break;
359      case '\t': OS << "\\t"; break;
360      default:
361        OS << '\\';
362        OS << toOctal(C >> 6);
363        OS << toOctal(C >> 3);
364        OS << toOctal(C >> 0);
365        break;
366    }
367  }
368
369  OS << '"';
370}
371
372
373void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
374  assert(CurSection && "Cannot emit contents before setting section!");
375  if (Data.empty()) return;
376
377  if (Data.size() == 1) {
378    OS << MAI.getData8bitsDirective(AddrSpace);
379    OS << (unsigned)(unsigned char)Data[0];
380    EmitEOL();
381    return;
382  }
383
384  // If the data ends with 0 and the target supports .asciz, use it, otherwise
385  // use .ascii
386  if (MAI.getAscizDirective() && Data.back() == 0) {
387    OS << MAI.getAscizDirective();
388    Data = Data.substr(0, Data.size()-1);
389  } else {
390    OS << MAI.getAsciiDirective();
391  }
392
393  OS << ' ';
394  PrintQuotedString(Data, OS);
395  EmitEOL();
396}
397
398/// EmitIntValue - Special case of EmitValue that avoids the client having
399/// to pass in a MCExpr for constant integers.
400void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
401                                 unsigned AddrSpace) {
402  assert(CurSection && "Cannot emit contents before setting section!");
403  const char *Directive = 0;
404  switch (Size) {
405  default: break;
406  case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
407  case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
408  case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
409  case 8:
410    Directive = MAI.getData64bitsDirective(AddrSpace);
411    // If the target doesn't support 64-bit data, emit as two 32-bit halves.
412    if (Directive) break;
413    if (isLittleEndian()) {
414      EmitIntValue((uint32_t)(Value >> 0 ), 4, AddrSpace);
415      EmitIntValue((uint32_t)(Value >> 32), 4, AddrSpace);
416    } else {
417      EmitIntValue((uint32_t)(Value >> 32), 4, AddrSpace);
418      EmitIntValue((uint32_t)(Value >> 0 ), 4, AddrSpace);
419    }
420    return;
421  }
422
423  assert(Directive && "Invalid size for machine code value!");
424  OS << Directive << truncateToSize(Value, Size);
425  EmitEOL();
426}
427
428void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
429                              unsigned AddrSpace) {
430  assert(CurSection && "Cannot emit contents before setting section!");
431  const char *Directive = 0;
432  switch (Size) {
433  default: break;
434  case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
435  case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
436  case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
437  case 8: Directive = MAI.getData64bitsDirective(AddrSpace); break;
438  }
439
440  assert(Directive && "Invalid size for machine code value!");
441  OS << Directive << *Value;
442  EmitEOL();
443}
444
445void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
446  assert(MAI.getGPRel32Directive() != 0);
447  OS << MAI.getGPRel32Directive() << *Value;
448  EmitEOL();
449}
450
451
452/// EmitFill - Emit NumBytes bytes worth of the value specified by
453/// FillValue.  This implements directives such as '.space'.
454void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
455                             unsigned AddrSpace) {
456  if (NumBytes == 0) return;
457
458  if (AddrSpace == 0)
459    if (const char *ZeroDirective = MAI.getZeroDirective()) {
460      OS << ZeroDirective << NumBytes;
461      if (FillValue != 0)
462        OS << ',' << (int)FillValue;
463      EmitEOL();
464      return;
465    }
466
467  // Emit a byte at a time.
468  MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
469}
470
471void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
472                                         unsigned ValueSize,
473                                         unsigned MaxBytesToEmit) {
474  // Some assemblers don't support non-power of two alignments, so we always
475  // emit alignments as a power of two if possible.
476  if (isPowerOf2_32(ByteAlignment)) {
477    switch (ValueSize) {
478    default: llvm_unreachable("Invalid size for machine code value!");
479    case 1: OS << MAI.getAlignDirective(); break;
480    // FIXME: use MAI for this!
481    case 2: OS << ".p2alignw "; break;
482    case 4: OS << ".p2alignl "; break;
483    case 8: llvm_unreachable("Unsupported alignment size!");
484    }
485
486    if (MAI.getAlignmentIsInBytes())
487      OS << ByteAlignment;
488    else
489      OS << Log2_32(ByteAlignment);
490
491    if (Value || MaxBytesToEmit) {
492      OS << ", 0x";
493      OS.write_hex(truncateToSize(Value, ValueSize));
494
495      if (MaxBytesToEmit)
496        OS << ", " << MaxBytesToEmit;
497    }
498    EmitEOL();
499    return;
500  }
501
502  // Non-power of two alignment.  This is not widely supported by assemblers.
503  // FIXME: Parameterize this based on MAI.
504  switch (ValueSize) {
505  default: llvm_unreachable("Invalid size for machine code value!");
506  case 1: OS << ".balign";  break;
507  case 2: OS << ".balignw"; break;
508  case 4: OS << ".balignl"; break;
509  case 8: llvm_unreachable("Unsupported alignment size!");
510  }
511
512  OS << ' ' << ByteAlignment;
513  OS << ", " << truncateToSize(Value, ValueSize);
514  if (MaxBytesToEmit)
515    OS << ", " << MaxBytesToEmit;
516  EmitEOL();
517}
518
519void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
520                                      unsigned MaxBytesToEmit) {
521  // Emit with a text fill value.
522  EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
523                       1, MaxBytesToEmit);
524}
525
526void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
527                                      unsigned char Value) {
528  // FIXME: Verify that Offset is associated with the current section.
529  OS << ".org " << *Offset << ", " << (unsigned) Value;
530  EmitEOL();
531}
532
533
534void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
535  assert(MAI.hasSingleParameterDotFile());
536  OS << "\t.file\t";
537  PrintQuotedString(Filename, OS);
538  EmitEOL();
539}
540
541void MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
542  OS << "\t.file\t" << FileNo << ' ';
543  PrintQuotedString(Filename, OS);
544  EmitEOL();
545}
546
547void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
548  raw_ostream &OS = GetCommentOS();
549  SmallString<256> Code;
550  SmallVector<MCFixup, 4> Fixups;
551  raw_svector_ostream VecOS(Code);
552  Emitter->EncodeInstruction(Inst, VecOS, Fixups);
553  VecOS.flush();
554
555  // If we are showing fixups, create symbolic markers in the encoded
556  // representation. We do this by making a per-bit map to the fixup item index,
557  // then trying to display it as nicely as possible.
558  SmallVector<uint8_t, 64> FixupMap;
559  FixupMap.resize(Code.size() * 8);
560  for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
561    FixupMap[i] = 0;
562
563  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
564    MCFixup &F = Fixups[i];
565    const MCFixupKindInfo &Info = Emitter->getFixupKindInfo(F.getKind());
566    for (unsigned j = 0; j != Info.TargetSize; ++j) {
567      unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
568      assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
569      FixupMap[Index] = 1 + i;
570    }
571  }
572
573  OS << "encoding: [";
574  for (unsigned i = 0, e = Code.size(); i != e; ++i) {
575    if (i)
576      OS << ',';
577
578    // See if all bits are the same map entry.
579    uint8_t MapEntry = FixupMap[i * 8 + 0];
580    for (unsigned j = 1; j != 8; ++j) {
581      if (FixupMap[i * 8 + j] == MapEntry)
582        continue;
583
584      MapEntry = uint8_t(~0U);
585      break;
586    }
587
588    if (MapEntry != uint8_t(~0U)) {
589      if (MapEntry == 0) {
590        OS << format("0x%02x", uint8_t(Code[i]));
591      } else {
592        assert(Code[i] == 0 && "Encoder wrote into fixed up bit!");
593        OS << char('A' + MapEntry - 1);
594      }
595    } else {
596      // Otherwise, write out in binary.
597      OS << "0b";
598      for (unsigned j = 8; j--;) {
599        unsigned Bit = (Code[i] >> j) & 1;
600        if (uint8_t MapEntry = FixupMap[i * 8 + j]) {
601          assert(Bit == 0 && "Encoder wrote into fixed up bit!");
602          OS << char('A' + MapEntry - 1);
603        } else
604          OS << Bit;
605      }
606    }
607  }
608  OS << "]\n";
609
610  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
611    MCFixup &F = Fixups[i];
612    const MCFixupKindInfo &Info = Emitter->getFixupKindInfo(F.getKind());
613    OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
614       << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
615  }
616}
617
618void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
619  assert(CurSection && "Cannot emit contents before setting section!");
620
621  // Show the encoding in a comment if we have a code emitter.
622  if (Emitter)
623    AddEncodingComment(Inst);
624
625  // Show the MCInst if enabled.
626  if (ShowInst)
627    Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
628
629  // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
630  if (InstPrinter)
631    InstPrinter->printInst(&Inst);
632  else
633    Inst.print(OS, &MAI);
634  EmitEOL();
635}
636
637void MCAsmStreamer::Finish() {
638  OS.flush();
639}
640
641MCStreamer *llvm::createAsmStreamer(MCContext &Context,
642                                    formatted_raw_ostream &OS,
643                                    bool isLittleEndian,
644                                    bool isVerboseAsm, MCInstPrinter *IP,
645                                    MCCodeEmitter *CE, bool ShowInst) {
646  return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
647                           IP, CE, ShowInst);
648}
649