MCAsmStreamer.cpp revision 1fe9737eb49ecb80fbb547f0e16e10a726cd53cf 
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 EmitThumbFunc(MCSymbol *Func);
142
143  virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
144  virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
145  virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
146                                        const MCSymbol *LastLabel,
147                                        const MCSymbol *Label,
148                                        unsigned PointerSize);
149  virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
150                                         const MCSymbol *Label);
151
152  virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
153
154  virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
155  virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
156  virtual void EmitCOFFSymbolStorageClass(int StorageClass);
157  virtual void EmitCOFFSymbolType(int Type);
158  virtual void EndCOFFSymbolDef();
159  virtual void EmitCOFFSecRel32(MCSymbol const *Symbol);
160  virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
161  virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
162                                unsigned ByteAlignment);
163
164  /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
165  ///
166  /// @param Symbol - The common symbol to emit.
167  /// @param Size - The size of the common symbol.
168  /// @param Size - The alignment of the common symbol in bytes.
169  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
170                                     unsigned ByteAlignment);
171
172  virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
173                            unsigned Size = 0, unsigned ByteAlignment = 0);
174
175  virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
176                               uint64_t Size, unsigned ByteAlignment = 0);
177
178  virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
179
180  virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
181                             unsigned AddrSpace);
182  virtual void EmitIntValue(uint64_t Value, unsigned Size,
183                            unsigned AddrSpace = 0);
184
185  virtual void EmitULEB128Value(const MCExpr *Value);
186
187  virtual void EmitSLEB128Value(const MCExpr *Value);
188
189  virtual void EmitGPRel32Value(const MCExpr *Value);
190
191
192  virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
193                        unsigned AddrSpace);
194
195  virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
196                                    unsigned ValueSize = 1,
197                                    unsigned MaxBytesToEmit = 0);
198
199  virtual void EmitCodeAlignment(unsigned ByteAlignment,
200                                 unsigned MaxBytesToEmit = 0);
201
202  virtual void EmitValueToOffset(const MCExpr *Offset,
203                                 unsigned char Value = 0);
204
205  virtual void EmitFileDirective(StringRef Filename);
206  virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
207                                      StringRef Filename);
208  virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
209                                     unsigned Column, unsigned Flags,
210                                     unsigned Isa, unsigned Discriminator,
211                                     StringRef FileName);
212
213  virtual void EmitCFISections(bool EH, bool Debug);
214  virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
215  virtual void EmitCFIDefCfaOffset(int64_t Offset);
216  virtual void EmitCFIDefCfaRegister(int64_t Register);
217  virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
218  virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
219  virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
220  virtual void EmitCFIRememberState();
221  virtual void EmitCFIRestoreState();
222  virtual void EmitCFISameValue(int64_t Register);
223  virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
224  virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
225
226  virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
227  virtual void EmitWin64EHEndProc();
228  virtual void EmitWin64EHStartChained();
229  virtual void EmitWin64EHEndChained();
230  virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
231                                  bool Except);
232  virtual void EmitWin64EHHandlerData();
233  virtual void EmitWin64EHPushReg(unsigned Register);
234  virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset);
235  virtual void EmitWin64EHAllocStack(unsigned Size);
236  virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset);
237  virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset);
238  virtual void EmitWin64EHPushFrame(bool Code);
239  virtual void EmitWin64EHEndProlog();
240
241  virtual void EmitFnStart();
242  virtual void EmitFnEnd();
243  virtual void EmitCantUnwind();
244  virtual void EmitPersonality(const MCSymbol *Personality);
245  virtual void EmitHandlerData();
246  virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
247  virtual void EmitPad(int64_t Offset);
248  virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
249
250
251  virtual void EmitInstruction(const MCInst &Inst);
252
253  /// EmitRawText - If this file is backed by an assembly streamer, this dumps
254  /// the specified string in the output .s file.  This capability is
255  /// indicated by the hasRawTextSupport() predicate.
256  virtual void EmitRawText(StringRef String);
257
258  virtual void FinishImpl();
259
260  /// @}
261};
262
263} // end anonymous namespace.
264
265/// AddComment - Add a comment that can be emitted to the generated .s
266/// file if applicable as a QoI issue to make the output of the compiler
267/// more readable.  This only affects the MCAsmStreamer, and only when
268/// verbose assembly output is enabled.
269void MCAsmStreamer::AddComment(const Twine &T) {
270  if (!IsVerboseAsm) return;
271
272  // Make sure that CommentStream is flushed.
273  CommentStream.flush();
274
275  T.toVector(CommentToEmit);
276  // Each comment goes on its own line.
277  CommentToEmit.push_back('\n');
278
279  // Tell the comment stream that the vector changed underneath it.
280  CommentStream.resync();
281}
282
283void MCAsmStreamer::EmitCommentsAndEOL() {
284  if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
285    OS << '\n';
286    return;
287  }
288
289  CommentStream.flush();
290  StringRef Comments = CommentToEmit.str();
291
292  assert(Comments.back() == '\n' &&
293         "Comment array not newline terminated");
294  do {
295    // Emit a line of comments.
296    OS.PadToColumn(MAI.getCommentColumn());
297    size_t Position = Comments.find('\n');
298    OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
299
300    Comments = Comments.substr(Position+1);
301  } while (!Comments.empty());
302
303  CommentToEmit.clear();
304  // Tell the comment stream that the vector changed underneath it.
305  CommentStream.resync();
306}
307
308static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
309  assert(Bytes && "Invalid size!");
310  return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
311}
312
313void MCAsmStreamer::ChangeSection(const MCSection *Section) {
314  assert(Section && "Cannot switch to a null section!");
315  Section->PrintSwitchToSection(MAI, OS);
316}
317
318void MCAsmStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
319                                        MCSymbol *EHSymbol) {
320  if (UseCFI)
321    return;
322
323  unsigned Flags = FlagMap.lookup(Symbol);
324
325  if (Flags & EHGlobal)
326    EmitSymbolAttribute(EHSymbol, MCSA_Global);
327  if (Flags & EHWeakDefinition)
328    EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
329  if (Flags & EHPrivateExtern)
330    EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
331}
332
333void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
334  assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
335  MCStreamer::EmitLabel(Symbol);
336
337  OS << *Symbol << MAI.getLabelSuffix();
338  EmitEOL();
339}
340
341void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
342  switch (Flag) {
343  default: assert(0 && "Invalid flag!");
344  case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
345  case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
346  case MCAF_Code16:                OS << '\t'<< MAI.getCode16Directive(); break;
347  case MCAF_Code32:                OS << '\t'<< MAI.getCode32Directive(); break;
348  case MCAF_Code64:                OS << '\t'<< MAI.getCode64Directive(); break;
349  }
350  EmitEOL();
351}
352
353void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
354  // This needs to emit to a temporary string to get properly quoted
355  // MCSymbols when they have spaces in them.
356  OS << "\t.thumb_func";
357  // Only Mach-O hasSubsectionsViaSymbols()
358  if (MAI.hasSubsectionsViaSymbols())
359    OS << '\t' << *Func;
360  EmitEOL();
361}
362
363void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
364  OS << *Symbol << " = " << *Value;
365  EmitEOL();
366
367  // FIXME: Lift context changes into super class.
368  Symbol->setVariableValue(Value);
369}
370
371void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
372  OS << ".weakref " << *Alias << ", " << *Symbol;
373  EmitEOL();
374}
375
376void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
377                                             const MCSymbol *LastLabel,
378                                             const MCSymbol *Label,
379                                             unsigned PointerSize) {
380  EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
381}
382
383void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
384                                              const MCSymbol *Label) {
385  EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
386  const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
387  AddrDelta = ForceExpAbs(AddrDelta);
388  EmitValue(AddrDelta, 4);
389}
390
391
392void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
393                                        MCSymbolAttr Attribute) {
394  switch (Attribute) {
395  case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
396  case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
397  case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
398  case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
399  case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
400  case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
401  case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
402  case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
403    assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
404    OS << "\t.type\t" << *Symbol << ','
405       << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
406    switch (Attribute) {
407    default: assert(0 && "Unknown ELF .type");
408    case MCSA_ELF_TypeFunction:    OS << "function"; break;
409    case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
410    case MCSA_ELF_TypeObject:      OS << "object"; break;
411    case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
412    case MCSA_ELF_TypeCommon:      OS << "common"; break;
413    case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
414    case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
415    }
416    EmitEOL();
417    return;
418  case MCSA_Global: // .globl/.global
419    OS << MAI.getGlobalDirective();
420    FlagMap[Symbol] |= EHGlobal;
421    break;
422  case MCSA_Hidden:         OS << "\t.hidden\t";          break;
423  case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
424  case MCSA_Internal:       OS << "\t.internal\t";        break;
425  case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
426  case MCSA_Local:          OS << "\t.local\t";           break;
427  case MCSA_NoDeadStrip:    OS << "\t.no_dead_strip\t";   break;
428  case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
429  case MCSA_PrivateExtern:
430    OS << "\t.private_extern\t";
431    FlagMap[Symbol] |= EHPrivateExtern;
432    break;
433  case MCSA_Protected:      OS << "\t.protected\t";       break;
434  case MCSA_Reference:      OS << "\t.reference\t";       break;
435  case MCSA_Weak:           OS << "\t.weak\t";            break;
436  case MCSA_WeakDefinition:
437    OS << "\t.weak_definition\t";
438    FlagMap[Symbol] |= EHWeakDefinition;
439    break;
440      // .weak_reference
441  case MCSA_WeakReference:  OS << MAI.getWeakRefDirective(); break;
442  case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
443  }
444
445  OS << *Symbol;
446  EmitEOL();
447}
448
449void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
450  OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
451  EmitEOL();
452}
453
454void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
455  OS << "\t.def\t " << *Symbol << ';';
456  EmitEOL();
457}
458
459void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
460  OS << "\t.scl\t" << StorageClass << ';';
461  EmitEOL();
462}
463
464void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
465  OS << "\t.type\t" << Type << ';';
466  EmitEOL();
467}
468
469void MCAsmStreamer::EndCOFFSymbolDef() {
470  OS << "\t.endef";
471  EmitEOL();
472}
473
474void MCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
475  OS << "\t.secrel32\t" << *Symbol << '\n';
476  EmitEOL();
477}
478
479void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
480  assert(MAI.hasDotTypeDotSizeDirective());
481  OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
482}
483
484void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
485                                     unsigned ByteAlignment) {
486  OS << "\t.comm\t" << *Symbol << ',' << Size;
487  if (ByteAlignment != 0) {
488    if (MAI.getCOMMDirectiveAlignmentIsInBytes())
489      OS << ',' << ByteAlignment;
490    else
491      OS << ',' << Log2_32(ByteAlignment);
492  }
493  EmitEOL();
494}
495
496/// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
497///
498/// @param Symbol - The common symbol to emit.
499/// @param Size - The size of the common symbol.
500void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
501                                          unsigned ByteAlign) {
502  assert(MAI.getLCOMMDirectiveType() != LCOMM::None &&
503         "Doesn't have .lcomm, can't emit it!");
504  OS << "\t.lcomm\t" << *Symbol << ',' << Size;
505  if (ByteAlign > 1) {
506    assert(MAI.getLCOMMDirectiveType() == LCOMM::ByteAlignment &&
507           "Alignment not supported on .lcomm!");
508    OS << ',' << ByteAlign;
509  }
510  EmitEOL();
511}
512
513void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
514                                 unsigned Size, unsigned ByteAlignment) {
515  // Note: a .zerofill directive does not switch sections.
516  OS << ".zerofill ";
517
518  // This is a mach-o specific directive.
519  const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
520  OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
521
522  if (Symbol != NULL) {
523    OS << ',' << *Symbol << ',' << Size;
524    if (ByteAlignment != 0)
525      OS << ',' << Log2_32(ByteAlignment);
526  }
527  EmitEOL();
528}
529
530// .tbss sym, size, align
531// This depends that the symbol has already been mangled from the original,
532// e.g. _a.
533void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
534                                   uint64_t Size, unsigned ByteAlignment) {
535  assert(Symbol != NULL && "Symbol shouldn't be NULL!");
536  // Instead of using the Section we'll just use the shortcut.
537  // This is a mach-o specific directive and section.
538  OS << ".tbss " << *Symbol << ", " << Size;
539
540  // Output align if we have it.  We default to 1 so don't bother printing
541  // that.
542  if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
543
544  EmitEOL();
545}
546
547static inline char toOctal(int X) { return (X&7)+'0'; }
548
549static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
550  OS << '"';
551
552  for (unsigned i = 0, e = Data.size(); i != e; ++i) {
553    unsigned char C = Data[i];
554    if (C == '"' || C == '\\') {
555      OS << '\\' << (char)C;
556      continue;
557    }
558
559    if (isprint((unsigned char)C)) {
560      OS << (char)C;
561      continue;
562    }
563
564    switch (C) {
565      case '\b': OS << "\\b"; break;
566      case '\f': OS << "\\f"; break;
567      case '\n': OS << "\\n"; break;
568      case '\r': OS << "\\r"; break;
569      case '\t': OS << "\\t"; break;
570      default:
571        OS << '\\';
572        OS << toOctal(C >> 6);
573        OS << toOctal(C >> 3);
574        OS << toOctal(C >> 0);
575        break;
576    }
577  }
578
579  OS << '"';
580}
581
582
583void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
584  assert(getCurrentSection() && "Cannot emit contents before setting section!");
585  if (Data.empty()) return;
586
587  if (Data.size() == 1) {
588    OS << MAI.getData8bitsDirective(AddrSpace);
589    OS << (unsigned)(unsigned char)Data[0];
590    EmitEOL();
591    return;
592  }
593
594  // If the data ends with 0 and the target supports .asciz, use it, otherwise
595  // use .ascii
596  if (MAI.getAscizDirective() && Data.back() == 0) {
597    OS << MAI.getAscizDirective();
598    Data = Data.substr(0, Data.size()-1);
599  } else {
600    OS << MAI.getAsciiDirective();
601  }
602
603  OS << ' ';
604  PrintQuotedString(Data, OS);
605  EmitEOL();
606}
607
608void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
609                                 unsigned AddrSpace) {
610  EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
611}
612
613void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
614                                  unsigned AddrSpace) {
615  assert(getCurrentSection() && "Cannot emit contents before setting section!");
616  const char *Directive = 0;
617  switch (Size) {
618  default: break;
619  case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
620  case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
621  case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
622  case 8:
623    Directive = MAI.getData64bitsDirective(AddrSpace);
624    // If the target doesn't support 64-bit data, emit as two 32-bit halves.
625    if (Directive) break;
626    int64_t IntValue;
627    if (!Value->EvaluateAsAbsolute(IntValue))
628      report_fatal_error("Don't know how to emit this value.");
629    if (getContext().getAsmInfo().isLittleEndian()) {
630      EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
631      EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
632    } else {
633      EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
634      EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
635    }
636    return;
637  }
638
639  assert(Directive && "Invalid size for machine code value!");
640  OS << Directive << *Value;
641  EmitEOL();
642}
643
644void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
645  int64_t IntValue;
646  if (Value->EvaluateAsAbsolute(IntValue)) {
647    EmitULEB128IntValue(IntValue);
648    return;
649  }
650  assert(MAI.hasLEB128() && "Cannot print a .uleb");
651  OS << ".uleb128 " << *Value;
652  EmitEOL();
653}
654
655void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
656  int64_t IntValue;
657  if (Value->EvaluateAsAbsolute(IntValue)) {
658    EmitSLEB128IntValue(IntValue);
659    return;
660  }
661  assert(MAI.hasLEB128() && "Cannot print a .sleb");
662  OS << ".sleb128 " << *Value;
663  EmitEOL();
664}
665
666void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
667  assert(MAI.getGPRel32Directive() != 0);
668  OS << MAI.getGPRel32Directive() << *Value;
669  EmitEOL();
670}
671
672
673/// EmitFill - Emit NumBytes bytes worth of the value specified by
674/// FillValue.  This implements directives such as '.space'.
675void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
676                             unsigned AddrSpace) {
677  if (NumBytes == 0) return;
678
679  if (AddrSpace == 0)
680    if (const char *ZeroDirective = MAI.getZeroDirective()) {
681      OS << ZeroDirective << NumBytes;
682      if (FillValue != 0)
683        OS << ',' << (int)FillValue;
684      EmitEOL();
685      return;
686    }
687
688  // Emit a byte at a time.
689  MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
690}
691
692void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
693                                         unsigned ValueSize,
694                                         unsigned MaxBytesToEmit) {
695  // Some assemblers don't support non-power of two alignments, so we always
696  // emit alignments as a power of two if possible.
697  if (isPowerOf2_32(ByteAlignment)) {
698    switch (ValueSize) {
699    default: llvm_unreachable("Invalid size for machine code value!");
700    case 1: OS << MAI.getAlignDirective(); break;
701    // FIXME: use MAI for this!
702    case 2: OS << ".p2alignw "; break;
703    case 4: OS << ".p2alignl "; break;
704    case 8: llvm_unreachable("Unsupported alignment size!");
705    }
706
707    if (MAI.getAlignmentIsInBytes())
708      OS << ByteAlignment;
709    else
710      OS << Log2_32(ByteAlignment);
711
712    if (Value || MaxBytesToEmit) {
713      OS << ", 0x";
714      OS.write_hex(truncateToSize(Value, ValueSize));
715
716      if (MaxBytesToEmit)
717        OS << ", " << MaxBytesToEmit;
718    }
719    EmitEOL();
720    return;
721  }
722
723  // Non-power of two alignment.  This is not widely supported by assemblers.
724  // FIXME: Parameterize this based on MAI.
725  switch (ValueSize) {
726  default: llvm_unreachable("Invalid size for machine code value!");
727  case 1: OS << ".balign";  break;
728  case 2: OS << ".balignw"; break;
729  case 4: OS << ".balignl"; break;
730  case 8: llvm_unreachable("Unsupported alignment size!");
731  }
732
733  OS << ' ' << ByteAlignment;
734  OS << ", " << truncateToSize(Value, ValueSize);
735  if (MaxBytesToEmit)
736    OS << ", " << MaxBytesToEmit;
737  EmitEOL();
738}
739
740void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
741                                      unsigned MaxBytesToEmit) {
742  // Emit with a text fill value.
743  EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
744                       1, MaxBytesToEmit);
745}
746
747void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
748                                      unsigned char Value) {
749  // FIXME: Verify that Offset is associated with the current section.
750  OS << ".org " << *Offset << ", " << (unsigned) Value;
751  EmitEOL();
752}
753
754
755void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
756  assert(MAI.hasSingleParameterDotFile());
757  OS << "\t.file\t";
758  PrintQuotedString(Filename, OS);
759  EmitEOL();
760}
761
762bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
763                                           StringRef Filename) {
764  if (!UseDwarfDirectory && !Directory.empty()) {
765    if (sys::path::is_absolute(Filename))
766      return EmitDwarfFileDirective(FileNo, "", Filename);
767
768    SmallString<128> FullPathName = Directory;
769    sys::path::append(FullPathName, Filename);
770    return EmitDwarfFileDirective(FileNo, "", FullPathName);
771  }
772
773  if (UseLoc) {
774    OS << "\t.file\t" << FileNo << ' ';
775    if (!Directory.empty()) {
776      PrintQuotedString(Directory, OS);
777      OS << ' ';
778    }
779    PrintQuotedString(Filename, OS);
780    EmitEOL();
781  }
782  return this->MCStreamer::EmitDwarfFileDirective(FileNo, Directory, Filename);
783}
784
785void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
786                                          unsigned Column, unsigned Flags,
787                                          unsigned Isa,
788                                          unsigned Discriminator,
789                                          StringRef FileName) {
790  this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
791                                          Isa, Discriminator, FileName);
792  if (!UseLoc)
793    return;
794
795  OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
796  if (Flags & DWARF2_FLAG_BASIC_BLOCK)
797    OS << " basic_block";
798  if (Flags & DWARF2_FLAG_PROLOGUE_END)
799    OS << " prologue_end";
800  if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
801    OS << " epilogue_begin";
802
803  unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
804  if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
805    OS << " is_stmt ";
806
807    if (Flags & DWARF2_FLAG_IS_STMT)
808      OS << "1";
809    else
810      OS << "0";
811  }
812
813  if (Isa)
814    OS << "isa " << Isa;
815  if (Discriminator)
816    OS << "discriminator " << Discriminator;
817
818  if (IsVerboseAsm) {
819    OS.PadToColumn(MAI.getCommentColumn());
820    OS << MAI.getCommentString() << ' ' << FileName << ':'
821       << Line << ':' << Column;
822  }
823  EmitEOL();
824}
825
826void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
827  MCStreamer::EmitCFISections(EH, Debug);
828
829  if (!UseCFI)
830    return;
831
832  OS << "\t.cfi_sections ";
833  if (EH) {
834    OS << ".eh_frame";
835    if (Debug)
836      OS << ", .debug_frame";
837  } else if (Debug) {
838    OS << ".debug_frame";
839  }
840
841  EmitEOL();
842}
843
844void MCAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
845  if (!UseCFI) {
846    RecordProcStart(Frame);
847    return;
848  }
849
850  OS << "\t.cfi_startproc";
851  EmitEOL();
852}
853
854void MCAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
855  if (!UseCFI) {
856    RecordProcEnd(Frame);
857    return;
858  }
859
860  // Put a dummy non-null value in Frame.End to mark that this frame has been
861  // closed.
862  Frame.End = (MCSymbol *) 1;
863
864  OS << "\t.cfi_endproc";
865  EmitEOL();
866}
867
868void MCAsmStreamer::EmitRegisterName(int64_t Register) {
869  if (InstPrinter && !MAI.useDwarfRegNumForCFI()) {
870    const MCRegisterInfo &MRI = getContext().getRegisterInfo();
871    unsigned LLVMRegister = MRI.getLLVMRegNum(Register, true);
872    InstPrinter->printRegName(OS, LLVMRegister);
873  } else {
874    OS << Register;
875  }
876}
877
878void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
879  MCStreamer::EmitCFIDefCfa(Register, Offset);
880
881  if (!UseCFI)
882    return;
883
884  OS << "\t.cfi_def_cfa ";
885  EmitRegisterName(Register);
886  OS << ", " << Offset;
887  EmitEOL();
888}
889
890void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
891  MCStreamer::EmitCFIDefCfaOffset(Offset);
892
893  if (!UseCFI)
894    return;
895
896  OS << "\t.cfi_def_cfa_offset " << Offset;
897  EmitEOL();
898}
899
900void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
901  MCStreamer::EmitCFIDefCfaRegister(Register);
902
903  if (!UseCFI)
904    return;
905
906  OS << "\t.cfi_def_cfa_register ";
907  EmitRegisterName(Register);
908  EmitEOL();
909}
910
911void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
912  this->MCStreamer::EmitCFIOffset(Register, Offset);
913
914  if (!UseCFI)
915    return;
916
917  OS << "\t.cfi_offset ";
918  EmitRegisterName(Register);
919  OS << ", " << Offset;
920  EmitEOL();
921}
922
923void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
924                                       unsigned Encoding) {
925  MCStreamer::EmitCFIPersonality(Sym, Encoding);
926
927  if (!UseCFI)
928    return;
929
930  OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
931  EmitEOL();
932}
933
934void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
935  MCStreamer::EmitCFILsda(Sym, Encoding);
936
937  if (!UseCFI)
938    return;
939
940  OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
941  EmitEOL();
942}
943
944void MCAsmStreamer::EmitCFIRememberState() {
945  MCStreamer::EmitCFIRememberState();
946
947  if (!UseCFI)
948    return;
949
950  OS << "\t.cfi_remember_state";
951  EmitEOL();
952}
953
954void MCAsmStreamer::EmitCFIRestoreState() {
955  MCStreamer::EmitCFIRestoreState();
956
957  if (!UseCFI)
958    return;
959
960  OS << "\t.cfi_restore_state";
961  EmitEOL();
962}
963
964void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
965  MCStreamer::EmitCFISameValue(Register);
966
967  if (!UseCFI)
968    return;
969
970  OS << "\t.cfi_same_value ";
971  EmitRegisterName(Register);
972  EmitEOL();
973}
974
975void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
976  MCStreamer::EmitCFIRelOffset(Register, Offset);
977
978  if (!UseCFI)
979    return;
980
981  OS << "\t.cfi_rel_offset ";
982  EmitRegisterName(Register);
983  OS << ", " << Offset;
984  EmitEOL();
985}
986
987void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
988  MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
989
990  if (!UseCFI)
991    return;
992
993  OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
994  EmitEOL();
995}
996
997void MCAsmStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
998  MCStreamer::EmitWin64EHStartProc(Symbol);
999
1000  OS << ".seh_proc " << *Symbol;
1001  EmitEOL();
1002}
1003
1004void MCAsmStreamer::EmitWin64EHEndProc() {
1005  MCStreamer::EmitWin64EHEndProc();
1006
1007  OS << "\t.seh_endproc";
1008  EmitEOL();
1009}
1010
1011void MCAsmStreamer::EmitWin64EHStartChained() {
1012  MCStreamer::EmitWin64EHStartChained();
1013
1014  OS << "\t.seh_startchained";
1015  EmitEOL();
1016}
1017
1018void MCAsmStreamer::EmitWin64EHEndChained() {
1019  MCStreamer::EmitWin64EHEndChained();
1020
1021  OS << "\t.seh_endchained";
1022  EmitEOL();
1023}
1024
1025void MCAsmStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
1026                                       bool Except) {
1027  MCStreamer::EmitWin64EHHandler(Sym, Unwind, Except);
1028
1029  OS << "\t.seh_handler " << *Sym;
1030  if (Unwind)
1031    OS << ", @unwind";
1032  if (Except)
1033    OS << ", @except";
1034  EmitEOL();
1035}
1036
1037static const MCSection *getWin64EHTableSection(StringRef suffix,
1038                                               MCContext &context) {
1039  // FIXME: This doesn't belong in MCObjectFileInfo. However,
1040  /// this duplicate code in MCWin64EH.cpp.
1041  if (suffix == "")
1042    return context.getObjectFileInfo()->getXDataSection();
1043  return context.getCOFFSection((".xdata"+suffix).str(),
1044                                COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
1045                                COFF::IMAGE_SCN_MEM_READ |
1046                                COFF::IMAGE_SCN_MEM_WRITE,
1047                                SectionKind::getDataRel());
1048}
1049
1050void MCAsmStreamer::EmitWin64EHHandlerData() {
1051  MCStreamer::EmitWin64EHHandlerData();
1052
1053  // Switch sections. Don't call SwitchSection directly, because that will
1054  // cause the section switch to be visible in the emitted assembly.
1055  // We only do this so the section switch that terminates the handler
1056  // data block is visible.
1057  MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
1058  StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
1059  const MCSection *xdataSect = getWin64EHTableSection(suffix, getContext());
1060  if (xdataSect)
1061    SwitchSectionNoChange(xdataSect);
1062
1063  OS << "\t.seh_handlerdata";
1064  EmitEOL();
1065}
1066
1067void MCAsmStreamer::EmitWin64EHPushReg(unsigned Register) {
1068  MCStreamer::EmitWin64EHPushReg(Register);
1069
1070  OS << "\t.seh_pushreg " << Register;
1071  EmitEOL();
1072}
1073
1074void MCAsmStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
1075  MCStreamer::EmitWin64EHSetFrame(Register, Offset);
1076
1077  OS << "\t.seh_setframe " << Register << ", " << Offset;
1078  EmitEOL();
1079}
1080
1081void MCAsmStreamer::EmitWin64EHAllocStack(unsigned Size) {
1082  MCStreamer::EmitWin64EHAllocStack(Size);
1083
1084  OS << "\t.seh_stackalloc " << Size;
1085  EmitEOL();
1086}
1087
1088void MCAsmStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
1089  MCStreamer::EmitWin64EHSaveReg(Register, Offset);
1090
1091  OS << "\t.seh_savereg " << Register << ", " << Offset;
1092  EmitEOL();
1093}
1094
1095void MCAsmStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
1096  MCStreamer::EmitWin64EHSaveXMM(Register, Offset);
1097
1098  OS << "\t.seh_savexmm " << Register << ", " << Offset;
1099  EmitEOL();
1100}
1101
1102void MCAsmStreamer::EmitWin64EHPushFrame(bool Code) {
1103  MCStreamer::EmitWin64EHPushFrame(Code);
1104
1105  OS << "\t.seh_pushframe";
1106  if (Code)
1107    OS << " @code";
1108  EmitEOL();
1109}
1110
1111void MCAsmStreamer::EmitWin64EHEndProlog(void) {
1112  MCStreamer::EmitWin64EHEndProlog();
1113
1114  OS << "\t.seh_endprologue";
1115  EmitEOL();
1116}
1117
1118void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
1119  raw_ostream &OS = GetCommentOS();
1120  SmallString<256> Code;
1121  SmallVector<MCFixup, 4> Fixups;
1122  raw_svector_ostream VecOS(Code);
1123  Emitter->EncodeInstruction(Inst, VecOS, Fixups);
1124  VecOS.flush();
1125
1126  // If we are showing fixups, create symbolic markers in the encoded
1127  // representation. We do this by making a per-bit map to the fixup item index,
1128  // then trying to display it as nicely as possible.
1129  SmallVector<uint8_t, 64> FixupMap;
1130  FixupMap.resize(Code.size() * 8);
1131  for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1132    FixupMap[i] = 0;
1133
1134  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1135    MCFixup &F = Fixups[i];
1136    const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1137    for (unsigned j = 0; j != Info.TargetSize; ++j) {
1138      unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1139      assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1140      FixupMap[Index] = 1 + i;
1141    }
1142  }
1143
1144  // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1145  // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1146  OS << "encoding: [";
1147  for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1148    if (i)
1149      OS << ',';
1150
1151    // See if all bits are the same map entry.
1152    uint8_t MapEntry = FixupMap[i * 8 + 0];
1153    for (unsigned j = 1; j != 8; ++j) {
1154      if (FixupMap[i * 8 + j] == MapEntry)
1155        continue;
1156
1157      MapEntry = uint8_t(~0U);
1158      break;
1159    }
1160
1161    if (MapEntry != uint8_t(~0U)) {
1162      if (MapEntry == 0) {
1163        OS << format("0x%02x", uint8_t(Code[i]));
1164      } else {
1165        if (Code[i]) {
1166          // FIXME: Some of the 8 bits require fix up.
1167          OS << format("0x%02x", uint8_t(Code[i])) << '\''
1168             << char('A' + MapEntry - 1) << '\'';
1169        } else
1170          OS << char('A' + MapEntry - 1);
1171      }
1172    } else {
1173      // Otherwise, write out in binary.
1174      OS << "0b";
1175      for (unsigned j = 8; j--;) {
1176        unsigned Bit = (Code[i] >> j) & 1;
1177
1178        unsigned FixupBit;
1179        if (getContext().getAsmInfo().isLittleEndian())
1180          FixupBit = i * 8 + j;
1181        else
1182          FixupBit = i * 8 + (7-j);
1183
1184        if (uint8_t MapEntry = FixupMap[FixupBit]) {
1185          assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1186          OS << char('A' + MapEntry - 1);
1187        } else
1188          OS << Bit;
1189      }
1190    }
1191  }
1192  OS << "]\n";
1193
1194  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1195    MCFixup &F = Fixups[i];
1196    const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1197    OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1198       << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1199  }
1200}
1201
1202void MCAsmStreamer::EmitFnStart() {
1203  OS << "\t.fnstart";
1204  EmitEOL();
1205}
1206
1207void MCAsmStreamer::EmitFnEnd() {
1208  OS << "\t.fnend";
1209  EmitEOL();
1210}
1211
1212void MCAsmStreamer::EmitCantUnwind() {
1213  OS << "\t.cantunwind";
1214  EmitEOL();
1215}
1216
1217void MCAsmStreamer::EmitHandlerData() {
1218  OS << "\t.handlerdata";
1219  EmitEOL();
1220}
1221
1222void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
1223  OS << "\t.personality " << Personality->getName();
1224  EmitEOL();
1225}
1226
1227void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
1228  OS << "\t.setfp\t";
1229  InstPrinter->printRegName(OS, FpReg);
1230  OS << ", ";
1231  InstPrinter->printRegName(OS, SpReg);
1232  if (Offset)
1233    OS << ", #" << Offset;
1234  EmitEOL();
1235}
1236
1237void MCAsmStreamer::EmitPad(int64_t Offset) {
1238  OS << "\t.pad\t#" << Offset;
1239  EmitEOL();
1240}
1241
1242void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
1243                                bool isVector) {
1244  assert(RegList.size() && "RegList should not be empty");
1245  if (isVector)
1246    OS << "\t.vsave\t{";
1247  else
1248    OS << "\t.save\t{";
1249
1250  InstPrinter->printRegName(OS, RegList[0]);
1251
1252  for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
1253    OS << ", ";
1254    InstPrinter->printRegName(OS, RegList[i]);
1255  }
1256
1257  OS << "}";
1258  EmitEOL();
1259}
1260
1261void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
1262  assert(getCurrentSection() && "Cannot emit contents before setting section!");
1263
1264  // Show the encoding in a comment if we have a code emitter.
1265  if (Emitter)
1266    AddEncodingComment(Inst);
1267
1268  // Show the MCInst if enabled.
1269  if (ShowInst) {
1270    Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
1271    GetCommentOS() << "\n";
1272  }
1273
1274  // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
1275  if (InstPrinter)
1276    InstPrinter->printInst(&Inst, OS, "");
1277  else
1278    Inst.print(OS, &MAI);
1279  EmitEOL();
1280}
1281
1282/// EmitRawText - If this file is backed by an assembly streamer, this dumps
1283/// the specified string in the output .s file.  This capability is
1284/// indicated by the hasRawTextSupport() predicate.
1285void MCAsmStreamer::EmitRawText(StringRef String) {
1286  if (!String.empty() && String.back() == '\n')
1287    String = String.substr(0, String.size()-1);
1288  OS << String;
1289  EmitEOL();
1290}
1291
1292void MCAsmStreamer::FinishImpl() {
1293  // Dump out the dwarf file & directory tables and line tables.
1294  if (getContext().hasDwarfFiles() && !UseLoc)
1295    MCDwarfFileTable::Emit(this);
1296
1297  // If we are generating dwarf for assembly source files dump out the sections.
1298  if (getContext().getGenDwarfForAssembly())
1299    MCGenDwarfInfo::Emit(this);
1300
1301  if (!UseCFI)
1302    EmitFrames(false);
1303}
1304MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1305                                    formatted_raw_ostream &OS,
1306                                    bool isVerboseAsm, bool useLoc,
1307                                    bool useCFI, bool useDwarfDirectory,
1308                                    MCInstPrinter *IP, MCCodeEmitter *CE,
1309                                    MCAsmBackend *MAB, bool ShowInst) {
1310  return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc, useCFI,
1311                           useDwarfDirectory, IP, CE, MAB, ShowInst);
1312}
1313