MCAsmStreamer.cpp revision 39646d96e76aea5d20bffb386233a0dbb5932a21 
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/MCFixupKindInfo.h"
16#include "llvm/MC/MCInst.h"
17#include "llvm/MC/MCInstPrinter.h"
18#include "llvm/MC/MCObjectFileInfo.h"
19#include "llvm/MC/MCRegisterInfo.h"
20#include "llvm/MC/MCSectionCOFF.h"
21#include "llvm/MC/MCSectionMachO.h"
22#include "llvm/MC/MCSymbol.h"
23#include "llvm/MC/MCAsmBackend.h"
24#include "llvm/ADT/OwningPtr.h"
25#include "llvm/ADT/SmallString.h"
26#include "llvm/ADT/StringExtras.h"
27#include "llvm/ADT/Twine.h"
28#include "llvm/Support/ErrorHandling.h"
29#include "llvm/Support/MathExtras.h"
30#include "llvm/Support/Format.h"
31#include "llvm/Support/FormattedStream.h"
32#include "llvm/Support/PathV2.h"
33#include <cctype>
34using namespace llvm;
35
36namespace {
37
38class MCAsmStreamer : public MCStreamer {
39protected:
40  formatted_raw_ostream &OS;
41  const MCAsmInfo &MAI;
42private:
43  OwningPtr<MCInstPrinter> InstPrinter;
44  OwningPtr<MCCodeEmitter> Emitter;
45  OwningPtr<MCAsmBackend> AsmBackend;
46
47  SmallString<128> CommentToEmit;
48  raw_svector_ostream CommentStream;
49
50  unsigned IsVerboseAsm : 1;
51  unsigned ShowInst : 1;
52  unsigned UseLoc : 1;
53  unsigned UseCFI : 1;
54  unsigned UseDwarfDirectory : 1;
55
56  enum EHSymbolFlags { EHGlobal         = 1,
57                       EHWeakDefinition = 1 << 1,
58                       EHPrivateExtern  = 1 << 2 };
59  DenseMap<const MCSymbol*, unsigned> FlagMap;
60
61  bool needsSet(const MCExpr *Value);
62
63  void EmitRegisterName(int64_t Register);
64  virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
65  virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame);
66
67public:
68  MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
69                bool isVerboseAsm, bool useLoc, bool useCFI,
70                bool useDwarfDirectory,
71                MCInstPrinter *printer, MCCodeEmitter *emitter,
72                MCAsmBackend *asmbackend,
73                bool showInst)
74    : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
75      InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
76      CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
77      ShowInst(showInst), UseLoc(useLoc), UseCFI(useCFI),
78      UseDwarfDirectory(useDwarfDirectory) {
79    if (InstPrinter && IsVerboseAsm)
80      InstPrinter->setCommentStream(CommentStream);
81  }
82  ~MCAsmStreamer() {}
83
84  inline void EmitEOL() {
85    // If we don't have any comments, just emit a \n.
86    if (!IsVerboseAsm) {
87      OS << '\n';
88      return;
89    }
90    EmitCommentsAndEOL();
91  }
92  void EmitCommentsAndEOL();
93
94  /// isVerboseAsm - Return true if this streamer supports verbose assembly at
95  /// all.
96  virtual bool isVerboseAsm() const { return IsVerboseAsm; }
97
98  /// hasRawTextSupport - We support EmitRawText.
99  virtual bool hasRawTextSupport() const { return true; }
100
101  /// AddComment - Add a comment that can be emitted to the generated .s
102  /// file if applicable as a QoI issue to make the output of the compiler
103  /// more readable.  This only affects the MCAsmStreamer, and only when
104  /// verbose assembly output is enabled.
105  virtual void AddComment(const Twine &T);
106
107  /// AddEncodingComment - Add a comment showing the encoding of an instruction.
108  virtual void AddEncodingComment(const MCInst &Inst);
109
110  /// GetCommentOS - Return a raw_ostream that comments can be written to.
111  /// Unlike AddComment, you are required to terminate comments with \n if you
112  /// use this method.
113  virtual raw_ostream &GetCommentOS() {
114    if (!IsVerboseAsm)
115      return nulls();  // Discard comments unless in verbose asm mode.
116    return CommentStream;
117  }
118
119  /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
120  virtual void AddBlankLine() {
121    EmitEOL();
122  }
123
124  /// @name MCStreamer Interface
125  /// @{
126
127  virtual void ChangeSection(const MCSection *Section);
128
129  virtual void InitSections() {
130    // FIXME, this is MachO specific, but the testsuite
131    // expects this.
132    SwitchSection(getContext().getMachOSection("__TEXT", "__text",
133                         MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
134                         0, SectionKind::getText()));
135  }
136
137  virtual void EmitLabel(MCSymbol *Symbol);
138  virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
139                                   MCSymbol *EHSymbol);
140  virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
141  virtual void EmitDataRegion(MCDataRegionType Kind);
142  virtual void EmitThumbFunc(MCSymbol *Func);
143
144  virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
145  virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
146  virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
147                                        const MCSymbol *LastLabel,
148                                        const MCSymbol *Label,
149                                        unsigned PointerSize);
150  virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
151                                         const MCSymbol *Label);
152
153  virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
154
155  virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
156  virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
157  virtual void EmitCOFFSymbolStorageClass(int StorageClass);
158  virtual void EmitCOFFSymbolType(int Type);
159  virtual void EndCOFFSymbolDef();
160  virtual void EmitCOFFSecRel32(MCSymbol const *Symbol);
161  virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
162  virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
163                                unsigned ByteAlignment);
164
165  /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
166  ///
167  /// @param Symbol - The common symbol to emit.
168  /// @param Size - The size of the common symbol.
169  /// @param ByteAlignment - The alignment of the common symbol in bytes.
170  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
171                                     unsigned ByteAlignment);
172
173  virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
174                            uint64_t Size = 0, unsigned ByteAlignment = 0);
175
176  virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
177                               uint64_t Size, unsigned ByteAlignment = 0);
178
179  virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
180
181  virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
182                             unsigned AddrSpace);
183  virtual void EmitIntValue(uint64_t Value, unsigned Size,
184                            unsigned AddrSpace = 0);
185
186  virtual void EmitULEB128Value(const MCExpr *Value);
187
188  virtual void EmitSLEB128Value(const MCExpr *Value);
189
190  virtual void EmitGPRel64Value(const MCExpr *Value);
191
192  virtual void EmitGPRel32Value(const MCExpr *Value);
193
194
195  virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
196                        unsigned AddrSpace);
197
198  virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
199                                    unsigned ValueSize = 1,
200                                    unsigned MaxBytesToEmit = 0);
201
202  virtual void EmitCodeAlignment(unsigned ByteAlignment,
203                                 unsigned MaxBytesToEmit = 0);
204
205  virtual bool EmitValueToOffset(const MCExpr *Offset,
206                                 unsigned char Value = 0);
207
208  virtual void EmitFileDirective(StringRef Filename);
209  virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
210                                      StringRef Filename);
211  virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
212                                     unsigned Column, unsigned Flags,
213                                     unsigned Isa, unsigned Discriminator,
214                                     StringRef FileName);
215
216  virtual void EmitCFISections(bool EH, bool Debug);
217  virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
218  virtual void EmitCFIDefCfaOffset(int64_t Offset);
219  virtual void EmitCFIDefCfaRegister(int64_t Register);
220  virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
221  virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
222  virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
223  virtual void EmitCFIRememberState();
224  virtual void EmitCFIRestoreState();
225  virtual void EmitCFISameValue(int64_t Register);
226  virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
227  virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
228  virtual void EmitCFISignalFrame();
229
230  virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
231  virtual void EmitWin64EHEndProc();
232  virtual void EmitWin64EHStartChained();
233  virtual void EmitWin64EHEndChained();
234  virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
235                                  bool Except);
236  virtual void EmitWin64EHHandlerData();
237  virtual void EmitWin64EHPushReg(unsigned Register);
238  virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset);
239  virtual void EmitWin64EHAllocStack(unsigned Size);
240  virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset);
241  virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset);
242  virtual void EmitWin64EHPushFrame(bool Code);
243  virtual void EmitWin64EHEndProlog();
244
245  virtual void EmitFnStart();
246  virtual void EmitFnEnd();
247  virtual void EmitCantUnwind();
248  virtual void EmitPersonality(const MCSymbol *Personality);
249  virtual void EmitHandlerData();
250  virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
251  virtual void EmitPad(int64_t Offset);
252  virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
253
254
255  virtual void EmitInstruction(const MCInst &Inst);
256
257  /// EmitRawText - If this file is backed by an assembly streamer, this dumps
258  /// the specified string in the output .s file.  This capability is
259  /// indicated by the hasRawTextSupport() predicate.
260  virtual void EmitRawText(StringRef String);
261
262  virtual void FinishImpl();
263
264  /// @}
265};
266
267} // end anonymous namespace.
268
269/// AddComment - Add a comment that can be emitted to the generated .s
270/// file if applicable as a QoI issue to make the output of the compiler
271/// more readable.  This only affects the MCAsmStreamer, and only when
272/// verbose assembly output is enabled.
273void MCAsmStreamer::AddComment(const Twine &T) {
274  if (!IsVerboseAsm) return;
275
276  // Make sure that CommentStream is flushed.
277  CommentStream.flush();
278
279  T.toVector(CommentToEmit);
280  // Each comment goes on its own line.
281  CommentToEmit.push_back('\n');
282
283  // Tell the comment stream that the vector changed underneath it.
284  CommentStream.resync();
285}
286
287void MCAsmStreamer::EmitCommentsAndEOL() {
288  if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
289    OS << '\n';
290    return;
291  }
292
293  CommentStream.flush();
294  StringRef Comments = CommentToEmit.str();
295
296  assert(Comments.back() == '\n' &&
297         "Comment array not newline terminated");
298  do {
299    // Emit a line of comments.
300    OS.PadToColumn(MAI.getCommentColumn());
301    size_t Position = Comments.find('\n');
302    OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
303
304    Comments = Comments.substr(Position+1);
305  } while (!Comments.empty());
306
307  CommentToEmit.clear();
308  // Tell the comment stream that the vector changed underneath it.
309  CommentStream.resync();
310}
311
312static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
313  assert(Bytes && "Invalid size!");
314  return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
315}
316
317void MCAsmStreamer::ChangeSection(const MCSection *Section) {
318  assert(Section && "Cannot switch to a null section!");
319  Section->PrintSwitchToSection(MAI, OS);
320}
321
322void MCAsmStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
323                                        MCSymbol *EHSymbol) {
324  if (UseCFI)
325    return;
326
327  unsigned Flags = FlagMap.lookup(Symbol);
328
329  if (Flags & EHGlobal)
330    EmitSymbolAttribute(EHSymbol, MCSA_Global);
331  if (Flags & EHWeakDefinition)
332    EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
333  if (Flags & EHPrivateExtern)
334    EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
335}
336
337void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
338  assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
339  MCStreamer::EmitLabel(Symbol);
340
341  OS << *Symbol << MAI.getLabelSuffix();
342  EmitEOL();
343}
344
345void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
346  switch (Flag) {
347  case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
348  case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
349  case MCAF_Code16:                OS << '\t'<< MAI.getCode16Directive(); break;
350  case MCAF_Code32:                OS << '\t'<< MAI.getCode32Directive(); break;
351  case MCAF_Code64:                OS << '\t'<< MAI.getCode64Directive(); break;
352  }
353  EmitEOL();
354}
355
356void MCAsmStreamer::EmitDataRegion(MCDataRegionType Kind) {
357  MCContext &Ctx = getContext();
358  const MCAsmInfo &MAI = Ctx.getAsmInfo();
359  if (!MAI.doesSupportDataRegionDirectives())
360    return;
361  switch (Kind) {
362  case MCDR_DataRegion:            OS << "\t.data_region"; break;
363  case MCDR_DataRegionJT8:         OS << "\t.data_region jt8"; break;
364  case MCDR_DataRegionJT16:        OS << "\t.data_region jt16"; break;
365  case MCDR_DataRegionJT32:        OS << "\t.data_region jt32"; break;
366  case MCDR_DataRegionEnd:         OS << "\t.end_data_region"; break;
367  }
368  EmitEOL();
369}
370
371void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
372  // This needs to emit to a temporary string to get properly quoted
373  // MCSymbols when they have spaces in them.
374  OS << "\t.thumb_func";
375  // Only Mach-O hasSubsectionsViaSymbols()
376  if (MAI.hasSubsectionsViaSymbols())
377    OS << '\t' << *Func;
378  EmitEOL();
379}
380
381void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
382  OS << *Symbol << " = " << *Value;
383  EmitEOL();
384
385  // FIXME: Lift context changes into super class.
386  Symbol->setVariableValue(Value);
387}
388
389void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
390  OS << ".weakref " << *Alias << ", " << *Symbol;
391  EmitEOL();
392}
393
394void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
395                                             const MCSymbol *LastLabel,
396                                             const MCSymbol *Label,
397                                             unsigned PointerSize) {
398  EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
399}
400
401void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
402                                              const MCSymbol *Label) {
403  EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
404  const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
405  AddrDelta = ForceExpAbs(AddrDelta);
406  EmitValue(AddrDelta, 4);
407}
408
409
410void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
411                                        MCSymbolAttr Attribute) {
412  switch (Attribute) {
413  case MCSA_Invalid: llvm_unreachable("Invalid symbol attribute");
414  case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
415  case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
416  case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
417  case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
418  case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
419  case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
420  case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
421    assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
422    OS << "\t.type\t" << *Symbol << ','
423       << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
424    switch (Attribute) {
425    default: llvm_unreachable("Unknown ELF .type");
426    case MCSA_ELF_TypeFunction:    OS << "function"; break;
427    case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
428    case MCSA_ELF_TypeObject:      OS << "object"; break;
429    case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
430    case MCSA_ELF_TypeCommon:      OS << "common"; break;
431    case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
432    case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
433    }
434    EmitEOL();
435    return;
436  case MCSA_Global: // .globl/.global
437    OS << MAI.getGlobalDirective();
438    FlagMap[Symbol] |= EHGlobal;
439    break;
440  case MCSA_Hidden:         OS << "\t.hidden\t";          break;
441  case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
442  case MCSA_Internal:       OS << "\t.internal\t";        break;
443  case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
444  case MCSA_Local:          OS << "\t.local\t";           break;
445  case MCSA_NoDeadStrip:    OS << "\t.no_dead_strip\t";   break;
446  case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
447  case MCSA_PrivateExtern:
448    OS << "\t.private_extern\t";
449    FlagMap[Symbol] |= EHPrivateExtern;
450    break;
451  case MCSA_Protected:      OS << "\t.protected\t";       break;
452  case MCSA_Reference:      OS << "\t.reference\t";       break;
453  case MCSA_Weak:           OS << "\t.weak\t";            break;
454  case MCSA_WeakDefinition:
455    OS << "\t.weak_definition\t";
456    FlagMap[Symbol] |= EHWeakDefinition;
457    break;
458      // .weak_reference
459  case MCSA_WeakReference:  OS << MAI.getWeakRefDirective(); break;
460  case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
461  }
462
463  OS << *Symbol;
464  EmitEOL();
465}
466
467void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
468  OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
469  EmitEOL();
470}
471
472void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
473  OS << "\t.def\t " << *Symbol << ';';
474  EmitEOL();
475}
476
477void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
478  OS << "\t.scl\t" << StorageClass << ';';
479  EmitEOL();
480}
481
482void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
483  OS << "\t.type\t" << Type << ';';
484  EmitEOL();
485}
486
487void MCAsmStreamer::EndCOFFSymbolDef() {
488  OS << "\t.endef";
489  EmitEOL();
490}
491
492void MCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
493  OS << "\t.secrel32\t" << *Symbol << '\n';
494  EmitEOL();
495}
496
497void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
498  assert(MAI.hasDotTypeDotSizeDirective());
499  OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
500}
501
502void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
503                                     unsigned ByteAlignment) {
504  OS << "\t.comm\t" << *Symbol << ',' << Size;
505  if (ByteAlignment != 0) {
506    if (MAI.getCOMMDirectiveAlignmentIsInBytes())
507      OS << ',' << ByteAlignment;
508    else
509      OS << ',' << Log2_32(ByteAlignment);
510  }
511  EmitEOL();
512}
513
514/// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
515///
516/// @param Symbol - The common symbol to emit.
517/// @param Size - The size of the common symbol.
518void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
519                                          unsigned ByteAlign) {
520  OS << "\t.lcomm\t" << *Symbol << ',' << Size;
521  if (ByteAlign > 1) {
522    assert(MAI.getLCOMMDirectiveSupportsAlignment() &&
523           "alignment not supported on .lcomm!");
524    if (MAI.getCOMMDirectiveAlignmentIsInBytes()) {
525      OS << ',' << ByteAlign;
526    } else {
527      assert(isPowerOf2_32(ByteAlign) && "alignment must be a power of 2");
528      OS << ',' << Log2_32(ByteAlign);
529    }
530  }
531  EmitEOL();
532}
533
534void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
535                                 uint64_t Size, unsigned ByteAlignment) {
536  // Note: a .zerofill directive does not switch sections.
537  OS << ".zerofill ";
538
539  // This is a mach-o specific directive.
540  const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
541  OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
542
543  if (Symbol != NULL) {
544    OS << ',' << *Symbol << ',' << Size;
545    if (ByteAlignment != 0)
546      OS << ',' << Log2_32(ByteAlignment);
547  }
548  EmitEOL();
549}
550
551// .tbss sym, size, align
552// This depends that the symbol has already been mangled from the original,
553// e.g. _a.
554void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
555                                   uint64_t Size, unsigned ByteAlignment) {
556  assert(Symbol != NULL && "Symbol shouldn't be NULL!");
557  // Instead of using the Section we'll just use the shortcut.
558  // This is a mach-o specific directive and section.
559  OS << ".tbss " << *Symbol << ", " << Size;
560
561  // Output align if we have it.  We default to 1 so don't bother printing
562  // that.
563  if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
564
565  EmitEOL();
566}
567
568static inline char toOctal(int X) { return (X&7)+'0'; }
569
570static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
571  OS << '"';
572
573  for (unsigned i = 0, e = Data.size(); i != e; ++i) {
574    unsigned char C = Data[i];
575    if (C == '"' || C == '\\') {
576      OS << '\\' << (char)C;
577      continue;
578    }
579
580    if (isprint((unsigned char)C)) {
581      OS << (char)C;
582      continue;
583    }
584
585    switch (C) {
586      case '\b': OS << "\\b"; break;
587      case '\f': OS << "\\f"; break;
588      case '\n': OS << "\\n"; break;
589      case '\r': OS << "\\r"; break;
590      case '\t': OS << "\\t"; break;
591      default:
592        OS << '\\';
593        OS << toOctal(C >> 6);
594        OS << toOctal(C >> 3);
595        OS << toOctal(C >> 0);
596        break;
597    }
598  }
599
600  OS << '"';
601}
602
603
604void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
605  assert(getCurrentSection() && "Cannot emit contents before setting section!");
606  if (Data.empty()) return;
607
608  if (Data.size() == 1) {
609    OS << MAI.getData8bitsDirective(AddrSpace);
610    OS << (unsigned)(unsigned char)Data[0];
611    EmitEOL();
612    return;
613  }
614
615  // If the data ends with 0 and the target supports .asciz, use it, otherwise
616  // use .ascii
617  if (MAI.getAscizDirective() && Data.back() == 0) {
618    OS << MAI.getAscizDirective();
619    Data = Data.substr(0, Data.size()-1);
620  } else {
621    OS << MAI.getAsciiDirective();
622  }
623
624  OS << ' ';
625  PrintQuotedString(Data, OS);
626  EmitEOL();
627}
628
629void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
630                                 unsigned AddrSpace) {
631  EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
632}
633
634void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
635                                  unsigned AddrSpace) {
636  assert(getCurrentSection() && "Cannot emit contents before setting section!");
637  const char *Directive = 0;
638  switch (Size) {
639  default: break;
640  case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
641  case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
642  case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
643  case 8:
644    Directive = MAI.getData64bitsDirective(AddrSpace);
645    // If the target doesn't support 64-bit data, emit as two 32-bit halves.
646    if (Directive) break;
647    int64_t IntValue;
648    if (!Value->EvaluateAsAbsolute(IntValue))
649      report_fatal_error("Don't know how to emit this value.");
650    if (getContext().getAsmInfo().isLittleEndian()) {
651      EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
652      EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
653    } else {
654      EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
655      EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
656    }
657    return;
658  }
659
660  assert(Directive && "Invalid size for machine code value!");
661  OS << Directive << *Value;
662  EmitEOL();
663}
664
665void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
666  int64_t IntValue;
667  if (Value->EvaluateAsAbsolute(IntValue)) {
668    EmitULEB128IntValue(IntValue);
669    return;
670  }
671  assert(MAI.hasLEB128() && "Cannot print a .uleb");
672  OS << ".uleb128 " << *Value;
673  EmitEOL();
674}
675
676void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
677  int64_t IntValue;
678  if (Value->EvaluateAsAbsolute(IntValue)) {
679    EmitSLEB128IntValue(IntValue);
680    return;
681  }
682  assert(MAI.hasLEB128() && "Cannot print a .sleb");
683  OS << ".sleb128 " << *Value;
684  EmitEOL();
685}
686
687void MCAsmStreamer::EmitGPRel64Value(const MCExpr *Value) {
688  assert(MAI.getGPRel64Directive() != 0);
689  OS << MAI.getGPRel64Directive() << *Value;
690  EmitEOL();
691}
692
693void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
694  assert(MAI.getGPRel32Directive() != 0);
695  OS << MAI.getGPRel32Directive() << *Value;
696  EmitEOL();
697}
698
699
700/// EmitFill - Emit NumBytes bytes worth of the value specified by
701/// FillValue.  This implements directives such as '.space'.
702void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
703                             unsigned AddrSpace) {
704  if (NumBytes == 0) return;
705
706  if (AddrSpace == 0)
707    if (const char *ZeroDirective = MAI.getZeroDirective()) {
708      OS << ZeroDirective << NumBytes;
709      if (FillValue != 0)
710        OS << ',' << (int)FillValue;
711      EmitEOL();
712      return;
713    }
714
715  // Emit a byte at a time.
716  MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
717}
718
719void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
720                                         unsigned ValueSize,
721                                         unsigned MaxBytesToEmit) {
722  // Some assemblers don't support non-power of two alignments, so we always
723  // emit alignments as a power of two if possible.
724  if (isPowerOf2_32(ByteAlignment)) {
725    switch (ValueSize) {
726    default: llvm_unreachable("Invalid size for machine code value!");
727    case 1: OS << MAI.getAlignDirective(); break;
728    // FIXME: use MAI for this!
729    case 2: OS << ".p2alignw "; break;
730    case 4: OS << ".p2alignl "; break;
731    case 8: llvm_unreachable("Unsupported alignment size!");
732    }
733
734    if (MAI.getAlignmentIsInBytes())
735      OS << ByteAlignment;
736    else
737      OS << Log2_32(ByteAlignment);
738
739    if (Value || MaxBytesToEmit) {
740      OS << ", 0x";
741      OS.write_hex(truncateToSize(Value, ValueSize));
742
743      if (MaxBytesToEmit)
744        OS << ", " << MaxBytesToEmit;
745    }
746    EmitEOL();
747    return;
748  }
749
750  // Non-power of two alignment.  This is not widely supported by assemblers.
751  // FIXME: Parameterize this based on MAI.
752  switch (ValueSize) {
753  default: llvm_unreachable("Invalid size for machine code value!");
754  case 1: OS << ".balign";  break;
755  case 2: OS << ".balignw"; break;
756  case 4: OS << ".balignl"; break;
757  case 8: llvm_unreachable("Unsupported alignment size!");
758  }
759
760  OS << ' ' << ByteAlignment;
761  OS << ", " << truncateToSize(Value, ValueSize);
762  if (MaxBytesToEmit)
763    OS << ", " << MaxBytesToEmit;
764  EmitEOL();
765}
766
767void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
768                                      unsigned MaxBytesToEmit) {
769  // Emit with a text fill value.
770  EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
771                       1, MaxBytesToEmit);
772}
773
774bool MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
775                                      unsigned char Value) {
776  // FIXME: Verify that Offset is associated with the current section.
777  OS << ".org " << *Offset << ", " << (unsigned) Value;
778  EmitEOL();
779  return false;
780}
781
782
783void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
784  assert(MAI.hasSingleParameterDotFile());
785  OS << "\t.file\t";
786  PrintQuotedString(Filename, OS);
787  EmitEOL();
788}
789
790bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
791                                           StringRef Filename) {
792  if (!UseDwarfDirectory && !Directory.empty()) {
793    if (sys::path::is_absolute(Filename))
794      return EmitDwarfFileDirective(FileNo, "", Filename);
795
796    SmallString<128> FullPathName = Directory;
797    sys::path::append(FullPathName, Filename);
798    return EmitDwarfFileDirective(FileNo, "", FullPathName);
799  }
800
801  if (UseLoc) {
802    OS << "\t.file\t" << FileNo << ' ';
803    if (!Directory.empty()) {
804      PrintQuotedString(Directory, OS);
805      OS << ' ';
806    }
807    PrintQuotedString(Filename, OS);
808    EmitEOL();
809  }
810  return this->MCStreamer::EmitDwarfFileDirective(FileNo, Directory, Filename);
811}
812
813void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
814                                          unsigned Column, unsigned Flags,
815                                          unsigned Isa,
816                                          unsigned Discriminator,
817                                          StringRef FileName) {
818  this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
819                                          Isa, Discriminator, FileName);
820  if (!UseLoc)
821    return;
822
823  OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
824  if (Flags & DWARF2_FLAG_BASIC_BLOCK)
825    OS << " basic_block";
826  if (Flags & DWARF2_FLAG_PROLOGUE_END)
827    OS << " prologue_end";
828  if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
829    OS << " epilogue_begin";
830
831  unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
832  if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
833    OS << " is_stmt ";
834
835    if (Flags & DWARF2_FLAG_IS_STMT)
836      OS << "1";
837    else
838      OS << "0";
839  }
840
841  if (Isa)
842    OS << "isa " << Isa;
843  if (Discriminator)
844    OS << "discriminator " << Discriminator;
845
846  if (IsVerboseAsm) {
847    OS.PadToColumn(MAI.getCommentColumn());
848    OS << MAI.getCommentString() << ' ' << FileName << ':'
849       << Line << ':' << Column;
850  }
851  EmitEOL();
852}
853
854void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
855  MCStreamer::EmitCFISections(EH, Debug);
856
857  if (!UseCFI)
858    return;
859
860  OS << "\t.cfi_sections ";
861  if (EH) {
862    OS << ".eh_frame";
863    if (Debug)
864      OS << ", .debug_frame";
865  } else if (Debug) {
866    OS << ".debug_frame";
867  }
868
869  EmitEOL();
870}
871
872void MCAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
873  if (!UseCFI) {
874    RecordProcStart(Frame);
875    return;
876  }
877
878  OS << "\t.cfi_startproc";
879  EmitEOL();
880}
881
882void MCAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
883  if (!UseCFI) {
884    RecordProcEnd(Frame);
885    return;
886  }
887
888  // Put a dummy non-null value in Frame.End to mark that this frame has been
889  // closed.
890  Frame.End = (MCSymbol *) 1;
891
892  OS << "\t.cfi_endproc";
893  EmitEOL();
894}
895
896void MCAsmStreamer::EmitRegisterName(int64_t Register) {
897  if (InstPrinter && !MAI.useDwarfRegNumForCFI()) {
898    const MCRegisterInfo &MRI = getContext().getRegisterInfo();
899    unsigned LLVMRegister = MRI.getLLVMRegNum(Register, true);
900    InstPrinter->printRegName(OS, LLVMRegister);
901  } else {
902    OS << Register;
903  }
904}
905
906void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
907  MCStreamer::EmitCFIDefCfa(Register, Offset);
908
909  if (!UseCFI)
910    return;
911
912  OS << "\t.cfi_def_cfa ";
913  EmitRegisterName(Register);
914  OS << ", " << Offset;
915  EmitEOL();
916}
917
918void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
919  MCStreamer::EmitCFIDefCfaOffset(Offset);
920
921  if (!UseCFI)
922    return;
923
924  OS << "\t.cfi_def_cfa_offset " << Offset;
925  EmitEOL();
926}
927
928void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
929  MCStreamer::EmitCFIDefCfaRegister(Register);
930
931  if (!UseCFI)
932    return;
933
934  OS << "\t.cfi_def_cfa_register ";
935  EmitRegisterName(Register);
936  EmitEOL();
937}
938
939void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
940  this->MCStreamer::EmitCFIOffset(Register, Offset);
941
942  if (!UseCFI)
943    return;
944
945  OS << "\t.cfi_offset ";
946  EmitRegisterName(Register);
947  OS << ", " << Offset;
948  EmitEOL();
949}
950
951void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
952                                       unsigned Encoding) {
953  MCStreamer::EmitCFIPersonality(Sym, Encoding);
954
955  if (!UseCFI)
956    return;
957
958  OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
959  EmitEOL();
960}
961
962void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
963  MCStreamer::EmitCFILsda(Sym, Encoding);
964
965  if (!UseCFI)
966    return;
967
968  OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
969  EmitEOL();
970}
971
972void MCAsmStreamer::EmitCFIRememberState() {
973  MCStreamer::EmitCFIRememberState();
974
975  if (!UseCFI)
976    return;
977
978  OS << "\t.cfi_remember_state";
979  EmitEOL();
980}
981
982void MCAsmStreamer::EmitCFIRestoreState() {
983  MCStreamer::EmitCFIRestoreState();
984
985  if (!UseCFI)
986    return;
987
988  OS << "\t.cfi_restore_state";
989  EmitEOL();
990}
991
992void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
993  MCStreamer::EmitCFISameValue(Register);
994
995  if (!UseCFI)
996    return;
997
998  OS << "\t.cfi_same_value ";
999  EmitRegisterName(Register);
1000  EmitEOL();
1001}
1002
1003void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
1004  MCStreamer::EmitCFIRelOffset(Register, Offset);
1005
1006  if (!UseCFI)
1007    return;
1008
1009  OS << "\t.cfi_rel_offset ";
1010  EmitRegisterName(Register);
1011  OS << ", " << Offset;
1012  EmitEOL();
1013}
1014
1015void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
1016  MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
1017
1018  if (!UseCFI)
1019    return;
1020
1021  OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
1022  EmitEOL();
1023}
1024
1025void MCAsmStreamer::EmitCFISignalFrame() {
1026  MCStreamer::EmitCFISignalFrame();
1027
1028  if (!UseCFI)
1029    return;
1030
1031  OS << "\t.cfi_signal_frame";
1032  EmitEOL();
1033}
1034
1035void MCAsmStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
1036  MCStreamer::EmitWin64EHStartProc(Symbol);
1037
1038  OS << ".seh_proc " << *Symbol;
1039  EmitEOL();
1040}
1041
1042void MCAsmStreamer::EmitWin64EHEndProc() {
1043  MCStreamer::EmitWin64EHEndProc();
1044
1045  OS << "\t.seh_endproc";
1046  EmitEOL();
1047}
1048
1049void MCAsmStreamer::EmitWin64EHStartChained() {
1050  MCStreamer::EmitWin64EHStartChained();
1051
1052  OS << "\t.seh_startchained";
1053  EmitEOL();
1054}
1055
1056void MCAsmStreamer::EmitWin64EHEndChained() {
1057  MCStreamer::EmitWin64EHEndChained();
1058
1059  OS << "\t.seh_endchained";
1060  EmitEOL();
1061}
1062
1063void MCAsmStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
1064                                       bool Except) {
1065  MCStreamer::EmitWin64EHHandler(Sym, Unwind, Except);
1066
1067  OS << "\t.seh_handler " << *Sym;
1068  if (Unwind)
1069    OS << ", @unwind";
1070  if (Except)
1071    OS << ", @except";
1072  EmitEOL();
1073}
1074
1075static const MCSection *getWin64EHTableSection(StringRef suffix,
1076                                               MCContext &context) {
1077  // FIXME: This doesn't belong in MCObjectFileInfo. However,
1078  /// this duplicate code in MCWin64EH.cpp.
1079  if (suffix == "")
1080    return context.getObjectFileInfo()->getXDataSection();
1081  return context.getCOFFSection((".xdata"+suffix).str(),
1082                                COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
1083                                COFF::IMAGE_SCN_MEM_READ |
1084                                COFF::IMAGE_SCN_MEM_WRITE,
1085                                SectionKind::getDataRel());
1086}
1087
1088void MCAsmStreamer::EmitWin64EHHandlerData() {
1089  MCStreamer::EmitWin64EHHandlerData();
1090
1091  // Switch sections. Don't call SwitchSection directly, because that will
1092  // cause the section switch to be visible in the emitted assembly.
1093  // We only do this so the section switch that terminates the handler
1094  // data block is visible.
1095  MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
1096  StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
1097  const MCSection *xdataSect = getWin64EHTableSection(suffix, getContext());
1098  if (xdataSect)
1099    SwitchSectionNoChange(xdataSect);
1100
1101  OS << "\t.seh_handlerdata";
1102  EmitEOL();
1103}
1104
1105void MCAsmStreamer::EmitWin64EHPushReg(unsigned Register) {
1106  MCStreamer::EmitWin64EHPushReg(Register);
1107
1108  OS << "\t.seh_pushreg " << Register;
1109  EmitEOL();
1110}
1111
1112void MCAsmStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
1113  MCStreamer::EmitWin64EHSetFrame(Register, Offset);
1114
1115  OS << "\t.seh_setframe " << Register << ", " << Offset;
1116  EmitEOL();
1117}
1118
1119void MCAsmStreamer::EmitWin64EHAllocStack(unsigned Size) {
1120  MCStreamer::EmitWin64EHAllocStack(Size);
1121
1122  OS << "\t.seh_stackalloc " << Size;
1123  EmitEOL();
1124}
1125
1126void MCAsmStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
1127  MCStreamer::EmitWin64EHSaveReg(Register, Offset);
1128
1129  OS << "\t.seh_savereg " << Register << ", " << Offset;
1130  EmitEOL();
1131}
1132
1133void MCAsmStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
1134  MCStreamer::EmitWin64EHSaveXMM(Register, Offset);
1135
1136  OS << "\t.seh_savexmm " << Register << ", " << Offset;
1137  EmitEOL();
1138}
1139
1140void MCAsmStreamer::EmitWin64EHPushFrame(bool Code) {
1141  MCStreamer::EmitWin64EHPushFrame(Code);
1142
1143  OS << "\t.seh_pushframe";
1144  if (Code)
1145    OS << " @code";
1146  EmitEOL();
1147}
1148
1149void MCAsmStreamer::EmitWin64EHEndProlog(void) {
1150  MCStreamer::EmitWin64EHEndProlog();
1151
1152  OS << "\t.seh_endprologue";
1153  EmitEOL();
1154}
1155
1156void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
1157  raw_ostream &OS = GetCommentOS();
1158  SmallString<256> Code;
1159  SmallVector<MCFixup, 4> Fixups;
1160  raw_svector_ostream VecOS(Code);
1161  Emitter->EncodeInstruction(Inst, VecOS, Fixups);
1162  VecOS.flush();
1163
1164  // If we are showing fixups, create symbolic markers in the encoded
1165  // representation. We do this by making a per-bit map to the fixup item index,
1166  // then trying to display it as nicely as possible.
1167  SmallVector<uint8_t, 64> FixupMap;
1168  FixupMap.resize(Code.size() * 8);
1169  for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1170    FixupMap[i] = 0;
1171
1172  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1173    MCFixup &F = Fixups[i];
1174    const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1175    for (unsigned j = 0; j != Info.TargetSize; ++j) {
1176      unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1177      assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1178      FixupMap[Index] = 1 + i;
1179    }
1180  }
1181
1182  // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1183  // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1184  OS << "encoding: [";
1185  for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1186    if (i)
1187      OS << ',';
1188
1189    // See if all bits are the same map entry.
1190    uint8_t MapEntry = FixupMap[i * 8 + 0];
1191    for (unsigned j = 1; j != 8; ++j) {
1192      if (FixupMap[i * 8 + j] == MapEntry)
1193        continue;
1194
1195      MapEntry = uint8_t(~0U);
1196      break;
1197    }
1198
1199    if (MapEntry != uint8_t(~0U)) {
1200      if (MapEntry == 0) {
1201        OS << format("0x%02x", uint8_t(Code[i]));
1202      } else {
1203        if (Code[i]) {
1204          // FIXME: Some of the 8 bits require fix up.
1205          OS << format("0x%02x", uint8_t(Code[i])) << '\''
1206             << char('A' + MapEntry - 1) << '\'';
1207        } else
1208          OS << char('A' + MapEntry - 1);
1209      }
1210    } else {
1211      // Otherwise, write out in binary.
1212      OS << "0b";
1213      for (unsigned j = 8; j--;) {
1214        unsigned Bit = (Code[i] >> j) & 1;
1215
1216        unsigned FixupBit;
1217        if (getContext().getAsmInfo().isLittleEndian())
1218          FixupBit = i * 8 + j;
1219        else
1220          FixupBit = i * 8 + (7-j);
1221
1222        if (uint8_t MapEntry = FixupMap[FixupBit]) {
1223          assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1224          OS << char('A' + MapEntry - 1);
1225        } else
1226          OS << Bit;
1227      }
1228    }
1229  }
1230  OS << "]\n";
1231
1232  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1233    MCFixup &F = Fixups[i];
1234    const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1235    OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1236       << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1237  }
1238}
1239
1240void MCAsmStreamer::EmitFnStart() {
1241  OS << "\t.fnstart";
1242  EmitEOL();
1243}
1244
1245void MCAsmStreamer::EmitFnEnd() {
1246  OS << "\t.fnend";
1247  EmitEOL();
1248}
1249
1250void MCAsmStreamer::EmitCantUnwind() {
1251  OS << "\t.cantunwind";
1252  EmitEOL();
1253}
1254
1255void MCAsmStreamer::EmitHandlerData() {
1256  OS << "\t.handlerdata";
1257  EmitEOL();
1258}
1259
1260void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
1261  OS << "\t.personality " << Personality->getName();
1262  EmitEOL();
1263}
1264
1265void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
1266  OS << "\t.setfp\t";
1267  InstPrinter->printRegName(OS, FpReg);
1268  OS << ", ";
1269  InstPrinter->printRegName(OS, SpReg);
1270  if (Offset)
1271    OS << ", #" << Offset;
1272  EmitEOL();
1273}
1274
1275void MCAsmStreamer::EmitPad(int64_t Offset) {
1276  OS << "\t.pad\t#" << Offset;
1277  EmitEOL();
1278}
1279
1280void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
1281                                bool isVector) {
1282  assert(RegList.size() && "RegList should not be empty");
1283  if (isVector)
1284    OS << "\t.vsave\t{";
1285  else
1286    OS << "\t.save\t{";
1287
1288  InstPrinter->printRegName(OS, RegList[0]);
1289
1290  for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
1291    OS << ", ";
1292    InstPrinter->printRegName(OS, RegList[i]);
1293  }
1294
1295  OS << "}";
1296  EmitEOL();
1297}
1298
1299void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
1300  assert(getCurrentSection() && "Cannot emit contents before setting section!");
1301
1302  // Show the encoding in a comment if we have a code emitter.
1303  if (Emitter)
1304    AddEncodingComment(Inst);
1305
1306  // Show the MCInst if enabled.
1307  if (ShowInst) {
1308    Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
1309    GetCommentOS() << "\n";
1310  }
1311
1312  // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
1313  if (InstPrinter)
1314    InstPrinter->printInst(&Inst, OS, "");
1315  else
1316    Inst.print(OS, &MAI);
1317  EmitEOL();
1318}
1319
1320/// EmitRawText - If this file is backed by an assembly streamer, this dumps
1321/// the specified string in the output .s file.  This capability is
1322/// indicated by the hasRawTextSupport() predicate.
1323void MCAsmStreamer::EmitRawText(StringRef String) {
1324  if (!String.empty() && String.back() == '\n')
1325    String = String.substr(0, String.size()-1);
1326  OS << String;
1327  EmitEOL();
1328}
1329
1330void MCAsmStreamer::FinishImpl() {
1331  // FIXME: This header is duplicated with MCObjectStreamer
1332  // Dump out the dwarf file & directory tables and line tables.
1333  const MCSymbol *LineSectionSymbol = NULL;
1334  if (getContext().hasDwarfFiles() && !UseLoc)
1335    LineSectionSymbol = MCDwarfFileTable::Emit(this);
1336
1337  // If we are generating dwarf for assembly source files dump out the sections.
1338  if (getContext().getGenDwarfForAssembly())
1339    MCGenDwarfInfo::Emit(this, LineSectionSymbol);
1340
1341  if (!UseCFI)
1342    EmitFrames(false);
1343}
1344MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1345                                    formatted_raw_ostream &OS,
1346                                    bool isVerboseAsm, bool useLoc,
1347                                    bool useCFI, bool useDwarfDirectory,
1348                                    MCInstPrinter *IP, MCCodeEmitter *CE,
1349                                    MCAsmBackend *MAB, bool ShowInst) {
1350  return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc, useCFI,
1351                           useDwarfDirectory, IP, CE, MAB, ShowInst);
1352}
1353