MCAsmStreamer.cpp revision 1be0e271a07925b928ba89848934f1ea6f1854e2 
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/MCSectionMachO.h"
19#include "llvm/MC/MCSymbol.h"
20#include "llvm/ADT/OwningPtr.h"
21#include "llvm/ADT/SmallString.h"
22#include "llvm/ADT/StringExtras.h"
23#include "llvm/ADT/Twine.h"
24#include "llvm/Support/ErrorHandling.h"
25#include "llvm/Support/MathExtras.h"
26#include "llvm/Support/Format.h"
27#include "llvm/Support/FormattedStream.h"
28#include "llvm/Target/TargetAsmBackend.h"
29#include "llvm/Target/TargetAsmInfo.h"
30#include "llvm/Target/TargetLoweringObjectFile.h"
31#include <cctype>
32using namespace llvm;
33
34namespace {
35
36class MCAsmStreamer : public MCStreamer {
37protected:
38  formatted_raw_ostream &OS;
39  const MCAsmInfo &MAI;
40private:
41  OwningPtr<MCInstPrinter> InstPrinter;
42  OwningPtr<MCCodeEmitter> Emitter;
43  OwningPtr<TargetAsmBackend> AsmBackend;
44
45  SmallString<128> CommentToEmit;
46  raw_svector_ostream CommentStream;
47
48  unsigned IsVerboseAsm : 1;
49  unsigned ShowInst : 1;
50  unsigned UseLoc : 1;
51  unsigned UseCFI : 1;
52
53  enum EHSymbolFlags { EHGlobal         = 1,
54                       EHWeakDefinition = 1 << 1,
55                       EHPrivateExtern  = 1 << 2 };
56  DenseMap<const MCSymbol*, unsigned> FlagMap;
57
58  bool needsSet(const MCExpr *Value);
59
60  void EmitRegisterName(int64_t Register);
61
62public:
63  MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
64                bool isVerboseAsm, bool useLoc, bool useCFI,
65                MCInstPrinter *printer, MCCodeEmitter *emitter,
66                TargetAsmBackend *asmbackend,
67                bool showInst)
68    : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
69      InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
70      CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
71      ShowInst(showInst), UseLoc(useLoc), UseCFI(useCFI) {
72    if (InstPrinter && IsVerboseAsm)
73      InstPrinter->setCommentStream(CommentStream);
74  }
75  ~MCAsmStreamer() {}
76
77  inline void EmitEOL() {
78    // If we don't have any comments, just emit a \n.
79    if (!IsVerboseAsm) {
80      OS << '\n';
81      return;
82    }
83    EmitCommentsAndEOL();
84  }
85  void EmitCommentsAndEOL();
86
87  /// isVerboseAsm - Return true if this streamer supports verbose assembly at
88  /// all.
89  virtual bool isVerboseAsm() const { return IsVerboseAsm; }
90
91  /// hasRawTextSupport - We support EmitRawText.
92  virtual bool hasRawTextSupport() const { return true; }
93
94  /// AddComment - Add a comment that can be emitted to the generated .s
95  /// file if applicable as a QoI issue to make the output of the compiler
96  /// more readable.  This only affects the MCAsmStreamer, and only when
97  /// verbose assembly output is enabled.
98  virtual void AddComment(const Twine &T);
99
100  /// AddEncodingComment - Add a comment showing the encoding of an instruction.
101  virtual void AddEncodingComment(const MCInst &Inst);
102
103  /// GetCommentOS - Return a raw_ostream that comments can be written to.
104  /// Unlike AddComment, you are required to terminate comments with \n if you
105  /// use this method.
106  virtual raw_ostream &GetCommentOS() {
107    if (!IsVerboseAsm)
108      return nulls();  // Discard comments unless in verbose asm mode.
109    return CommentStream;
110  }
111
112  /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
113  virtual void AddBlankLine() {
114    EmitEOL();
115  }
116
117  /// @name MCStreamer Interface
118  /// @{
119
120  virtual void ChangeSection(const MCSection *Section);
121
122  virtual void InitSections() {
123    // FIXME, this is MachO specific, but the testsuite
124    // expects this.
125    SwitchSection(getContext().getMachOSection("__TEXT", "__text",
126                         MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
127                         0, SectionKind::getText()));
128  }
129
130  virtual void EmitLabel(MCSymbol *Symbol);
131  virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
132                                   MCSymbol *EHSymbol);
133  virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
134  virtual void EmitThumbFunc(MCSymbol *Func);
135
136  virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
137  virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
138  virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
139                                        const MCSymbol *LastLabel,
140                                        const MCSymbol *Label,
141                                        unsigned PointerSize);
142  virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
143                                         const MCSymbol *Label);
144
145  virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
146
147  virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
148  virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
149  virtual void EmitCOFFSymbolStorageClass(int StorageClass);
150  virtual void EmitCOFFSymbolType(int Type);
151  virtual void EndCOFFSymbolDef();
152  virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
153  virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
154                                unsigned ByteAlignment);
155
156  /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
157  ///
158  /// @param Symbol - The common symbol to emit.
159  /// @param Size - The size of the common symbol.
160  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
161
162  virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
163                            unsigned Size = 0, unsigned ByteAlignment = 0);
164
165  virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
166                               uint64_t Size, unsigned ByteAlignment = 0);
167
168  virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
169
170  virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
171                             unsigned AddrSpace);
172  virtual void EmitIntValue(uint64_t Value, unsigned Size,
173                            unsigned AddrSpace = 0);
174
175  virtual void EmitULEB128Value(const MCExpr *Value);
176
177  virtual void EmitSLEB128Value(const MCExpr *Value);
178
179  virtual void EmitGPRel32Value(const MCExpr *Value);
180
181
182  virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
183                        unsigned AddrSpace);
184
185  virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
186                                    unsigned ValueSize = 1,
187                                    unsigned MaxBytesToEmit = 0);
188
189  virtual void EmitCodeAlignment(unsigned ByteAlignment,
190                                 unsigned MaxBytesToEmit = 0);
191
192  virtual void EmitValueToOffset(const MCExpr *Offset,
193                                 unsigned char Value = 0);
194
195  virtual void EmitFileDirective(StringRef Filename);
196  virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
197  virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
198                                     unsigned Column, unsigned Flags,
199                                     unsigned Isa, unsigned Discriminator,
200                                     StringRef FileName);
201
202  virtual void EmitCFISections(bool EH, bool Debug);
203  virtual void EmitCFIStartProc();
204  virtual void EmitCFIEndProc();
205  virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
206  virtual void EmitCFIDefCfaOffset(int64_t Offset);
207  virtual void EmitCFIDefCfaRegister(int64_t Register);
208  virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
209  virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
210  virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
211  virtual void EmitCFIRememberState();
212  virtual void EmitCFIRestoreState();
213  virtual void EmitCFISameValue(int64_t Register);
214  virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
215  virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
216
217  virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
218  virtual void EmitWin64EHEndProc();
219  virtual void EmitWin64EHStartChained();
220  virtual void EmitWin64EHEndChained();
221  virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
222                                  bool Except);
223  virtual void EmitWin64EHHandlerData();
224  virtual void EmitWin64EHPushReg(unsigned Register);
225  virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset);
226  virtual void EmitWin64EHAllocStack(unsigned Size);
227  virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset);
228  virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset);
229  virtual void EmitWin64EHPushFrame(bool Code);
230  virtual void EmitWin64EHEndProlog();
231
232  virtual void EmitFnStart();
233  virtual void EmitFnEnd();
234  virtual void EmitCantUnwind();
235  virtual void EmitPersonality(const MCSymbol *Personality);
236  virtual void EmitHandlerData();
237  virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
238  virtual void EmitPad(int64_t Offset);
239  virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
240
241
242  virtual void EmitInstruction(const MCInst &Inst);
243
244  /// EmitRawText - If this file is backed by an assembly streamer, this dumps
245  /// the specified string in the output .s file.  This capability is
246  /// indicated by the hasRawTextSupport() predicate.
247  virtual void EmitRawText(StringRef String);
248
249  virtual void Finish();
250
251  /// @}
252};
253
254} // end anonymous namespace.
255
256/// AddComment - Add a comment that can be emitted to the generated .s
257/// file if applicable as a QoI issue to make the output of the compiler
258/// more readable.  This only affects the MCAsmStreamer, and only when
259/// verbose assembly output is enabled.
260void MCAsmStreamer::AddComment(const Twine &T) {
261  if (!IsVerboseAsm) return;
262
263  // Make sure that CommentStream is flushed.
264  CommentStream.flush();
265
266  T.toVector(CommentToEmit);
267  // Each comment goes on its own line.
268  CommentToEmit.push_back('\n');
269
270  // Tell the comment stream that the vector changed underneath it.
271  CommentStream.resync();
272}
273
274void MCAsmStreamer::EmitCommentsAndEOL() {
275  if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
276    OS << '\n';
277    return;
278  }
279
280  CommentStream.flush();
281  StringRef Comments = CommentToEmit.str();
282
283  assert(Comments.back() == '\n' &&
284         "Comment array not newline terminated");
285  do {
286    // Emit a line of comments.
287    OS.PadToColumn(MAI.getCommentColumn());
288    size_t Position = Comments.find('\n');
289    OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
290
291    Comments = Comments.substr(Position+1);
292  } while (!Comments.empty());
293
294  CommentToEmit.clear();
295  // Tell the comment stream that the vector changed underneath it.
296  CommentStream.resync();
297}
298
299static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
300  assert(Bytes && "Invalid size!");
301  return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
302}
303
304void MCAsmStreamer::ChangeSection(const MCSection *Section) {
305  assert(Section && "Cannot switch to a null section!");
306  Section->PrintSwitchToSection(MAI, OS);
307}
308
309void MCAsmStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
310                                        MCSymbol *EHSymbol) {
311  if (UseCFI)
312    return;
313
314  unsigned Flags = FlagMap.lookup(Symbol);
315
316  if (Flags & EHGlobal)
317    EmitSymbolAttribute(EHSymbol, MCSA_Global);
318  if (Flags & EHWeakDefinition)
319    EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
320  if (Flags & EHPrivateExtern)
321    EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
322}
323
324void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
325  assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
326  MCStreamer::EmitLabel(Symbol);
327
328  OS << *Symbol << MAI.getLabelSuffix();
329  EmitEOL();
330}
331
332void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
333  switch (Flag) {
334  default: assert(0 && "Invalid flag!");
335  case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
336  case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
337  case MCAF_Code16:                OS << "\t.code\t16"; break;
338  case MCAF_Code32:                OS << "\t.code\t32"; break;
339  }
340  EmitEOL();
341}
342
343void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
344  // This needs to emit to a temporary string to get properly quoted
345  // MCSymbols when they have spaces in them.
346  OS << "\t.thumb_func";
347  // Only Mach-O hasSubsectionsViaSymbols()
348  if (MAI.hasSubsectionsViaSymbols())
349    OS << '\t' << *Func;
350  EmitEOL();
351}
352
353void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
354  OS << *Symbol << " = " << *Value;
355  EmitEOL();
356
357  // FIXME: Lift context changes into super class.
358  Symbol->setVariableValue(Value);
359}
360
361void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
362  OS << ".weakref " << *Alias << ", " << *Symbol;
363  EmitEOL();
364}
365
366void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
367                                             const MCSymbol *LastLabel,
368                                             const MCSymbol *Label,
369                                             unsigned PointerSize) {
370  EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
371}
372
373void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
374                                              const MCSymbol *Label) {
375  EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
376  const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
377  AddrDelta = ForceExpAbs(AddrDelta);
378  EmitValue(AddrDelta, 4);
379}
380
381
382void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
383                                        MCSymbolAttr Attribute) {
384  switch (Attribute) {
385  case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
386  case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
387  case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
388  case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
389  case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
390  case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
391  case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
392  case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
393    assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
394    OS << "\t.type\t" << *Symbol << ','
395       << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
396    switch (Attribute) {
397    default: assert(0 && "Unknown ELF .type");
398    case MCSA_ELF_TypeFunction:    OS << "function"; break;
399    case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
400    case MCSA_ELF_TypeObject:      OS << "object"; break;
401    case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
402    case MCSA_ELF_TypeCommon:      OS << "common"; break;
403    case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
404    case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
405    }
406    EmitEOL();
407    return;
408  case MCSA_Global: // .globl/.global
409    OS << MAI.getGlobalDirective();
410    FlagMap[Symbol] |= EHGlobal;
411    break;
412  case MCSA_Hidden:         OS << "\t.hidden\t";          break;
413  case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
414  case MCSA_Internal:       OS << "\t.internal\t";        break;
415  case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
416  case MCSA_Local:          OS << "\t.local\t";           break;
417  case MCSA_NoDeadStrip:    OS << "\t.no_dead_strip\t";   break;
418  case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
419  case MCSA_PrivateExtern:
420    OS << "\t.private_extern\t";
421    FlagMap[Symbol] |= EHPrivateExtern;
422    break;
423  case MCSA_Protected:      OS << "\t.protected\t";       break;
424  case MCSA_Reference:      OS << "\t.reference\t";       break;
425  case MCSA_Weak:           OS << "\t.weak\t";            break;
426  case MCSA_WeakDefinition:
427    OS << "\t.weak_definition\t";
428    FlagMap[Symbol] |= EHWeakDefinition;
429    break;
430      // .weak_reference
431  case MCSA_WeakReference:  OS << MAI.getWeakRefDirective(); break;
432  case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
433  }
434
435  OS << *Symbol;
436  EmitEOL();
437}
438
439void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
440  OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
441  EmitEOL();
442}
443
444void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
445  OS << "\t.def\t " << *Symbol << ';';
446  EmitEOL();
447}
448
449void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
450  OS << "\t.scl\t" << StorageClass << ';';
451  EmitEOL();
452}
453
454void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
455  OS << "\t.type\t" << Type << ';';
456  EmitEOL();
457}
458
459void MCAsmStreamer::EndCOFFSymbolDef() {
460  OS << "\t.endef";
461  EmitEOL();
462}
463
464void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
465  assert(MAI.hasDotTypeDotSizeDirective());
466  OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
467}
468
469void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
470                                     unsigned ByteAlignment) {
471  OS << "\t.comm\t" << *Symbol << ',' << Size;
472  if (ByteAlignment != 0) {
473    if (MAI.getCOMMDirectiveAlignmentIsInBytes())
474      OS << ',' << ByteAlignment;
475    else
476      OS << ',' << Log2_32(ByteAlignment);
477  }
478  EmitEOL();
479}
480
481/// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
482///
483/// @param Symbol - The common symbol to emit.
484/// @param Size - The size of the common symbol.
485void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
486  assert(MAI.hasLCOMMDirective() && "Doesn't have .lcomm, can't emit it!");
487  OS << "\t.lcomm\t" << *Symbol << ',' << Size;
488  EmitEOL();
489}
490
491void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
492                                 unsigned Size, unsigned ByteAlignment) {
493  // Note: a .zerofill directive does not switch sections.
494  OS << ".zerofill ";
495
496  // This is a mach-o specific directive.
497  const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
498  OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
499
500  if (Symbol != NULL) {
501    OS << ',' << *Symbol << ',' << Size;
502    if (ByteAlignment != 0)
503      OS << ',' << Log2_32(ByteAlignment);
504  }
505  EmitEOL();
506}
507
508// .tbss sym, size, align
509// This depends that the symbol has already been mangled from the original,
510// e.g. _a.
511void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
512                                   uint64_t Size, unsigned ByteAlignment) {
513  assert(Symbol != NULL && "Symbol shouldn't be NULL!");
514  // Instead of using the Section we'll just use the shortcut.
515  // This is a mach-o specific directive and section.
516  OS << ".tbss " << *Symbol << ", " << Size;
517
518  // Output align if we have it.  We default to 1 so don't bother printing
519  // that.
520  if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
521
522  EmitEOL();
523}
524
525static inline char toOctal(int X) { return (X&7)+'0'; }
526
527static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
528  OS << '"';
529
530  for (unsigned i = 0, e = Data.size(); i != e; ++i) {
531    unsigned char C = Data[i];
532    if (C == '"' || C == '\\') {
533      OS << '\\' << (char)C;
534      continue;
535    }
536
537    if (isprint((unsigned char)C)) {
538      OS << (char)C;
539      continue;
540    }
541
542    switch (C) {
543      case '\b': OS << "\\b"; break;
544      case '\f': OS << "\\f"; break;
545      case '\n': OS << "\\n"; break;
546      case '\r': OS << "\\r"; break;
547      case '\t': OS << "\\t"; break;
548      default:
549        OS << '\\';
550        OS << toOctal(C >> 6);
551        OS << toOctal(C >> 3);
552        OS << toOctal(C >> 0);
553        break;
554    }
555  }
556
557  OS << '"';
558}
559
560
561void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
562  assert(getCurrentSection() && "Cannot emit contents before setting section!");
563  if (Data.empty()) return;
564
565  if (Data.size() == 1) {
566    OS << MAI.getData8bitsDirective(AddrSpace);
567    OS << (unsigned)(unsigned char)Data[0];
568    EmitEOL();
569    return;
570  }
571
572  // If the data ends with 0 and the target supports .asciz, use it, otherwise
573  // use .ascii
574  if (MAI.getAscizDirective() && Data.back() == 0) {
575    OS << MAI.getAscizDirective();
576    Data = Data.substr(0, Data.size()-1);
577  } else {
578    OS << MAI.getAsciiDirective();
579  }
580
581  OS << ' ';
582  PrintQuotedString(Data, OS);
583  EmitEOL();
584}
585
586void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
587                                 unsigned AddrSpace) {
588  EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
589}
590
591void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
592                                  unsigned AddrSpace) {
593  assert(getCurrentSection() && "Cannot emit contents before setting section!");
594  const char *Directive = 0;
595  switch (Size) {
596  default: break;
597  case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
598  case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
599  case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
600  case 8:
601    Directive = MAI.getData64bitsDirective(AddrSpace);
602    // If the target doesn't support 64-bit data, emit as two 32-bit halves.
603    if (Directive) break;
604    int64_t IntValue;
605    if (!Value->EvaluateAsAbsolute(IntValue))
606      report_fatal_error("Don't know how to emit this value.");
607    if (getContext().getAsmInfo().isLittleEndian()) {
608      EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
609      EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
610    } else {
611      EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
612      EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
613    }
614    return;
615  }
616
617  assert(Directive && "Invalid size for machine code value!");
618  OS << Directive << *Value;
619  EmitEOL();
620}
621
622void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
623  int64_t IntValue;
624  if (Value->EvaluateAsAbsolute(IntValue)) {
625    EmitULEB128IntValue(IntValue);
626    return;
627  }
628  assert(MAI.hasLEB128() && "Cannot print a .uleb");
629  OS << ".uleb128 " << *Value;
630  EmitEOL();
631}
632
633void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
634  int64_t IntValue;
635  if (Value->EvaluateAsAbsolute(IntValue)) {
636    EmitSLEB128IntValue(IntValue);
637    return;
638  }
639  assert(MAI.hasLEB128() && "Cannot print a .sleb");
640  OS << ".sleb128 " << *Value;
641  EmitEOL();
642}
643
644void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
645  assert(MAI.getGPRel32Directive() != 0);
646  OS << MAI.getGPRel32Directive() << *Value;
647  EmitEOL();
648}
649
650
651/// EmitFill - Emit NumBytes bytes worth of the value specified by
652/// FillValue.  This implements directives such as '.space'.
653void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
654                             unsigned AddrSpace) {
655  if (NumBytes == 0) return;
656
657  if (AddrSpace == 0)
658    if (const char *ZeroDirective = MAI.getZeroDirective()) {
659      OS << ZeroDirective << NumBytes;
660      if (FillValue != 0)
661        OS << ',' << (int)FillValue;
662      EmitEOL();
663      return;
664    }
665
666  // Emit a byte at a time.
667  MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
668}
669
670void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
671                                         unsigned ValueSize,
672                                         unsigned MaxBytesToEmit) {
673  // Some assemblers don't support non-power of two alignments, so we always
674  // emit alignments as a power of two if possible.
675  if (isPowerOf2_32(ByteAlignment)) {
676    switch (ValueSize) {
677    default: llvm_unreachable("Invalid size for machine code value!");
678    case 1: OS << MAI.getAlignDirective(); break;
679    // FIXME: use MAI for this!
680    case 2: OS << ".p2alignw "; break;
681    case 4: OS << ".p2alignl "; break;
682    case 8: llvm_unreachable("Unsupported alignment size!");
683    }
684
685    if (MAI.getAlignmentIsInBytes())
686      OS << ByteAlignment;
687    else
688      OS << Log2_32(ByteAlignment);
689
690    if (Value || MaxBytesToEmit) {
691      OS << ", 0x";
692      OS.write_hex(truncateToSize(Value, ValueSize));
693
694      if (MaxBytesToEmit)
695        OS << ", " << MaxBytesToEmit;
696    }
697    EmitEOL();
698    return;
699  }
700
701  // Non-power of two alignment.  This is not widely supported by assemblers.
702  // FIXME: Parameterize this based on MAI.
703  switch (ValueSize) {
704  default: llvm_unreachable("Invalid size for machine code value!");
705  case 1: OS << ".balign";  break;
706  case 2: OS << ".balignw"; break;
707  case 4: OS << ".balignl"; break;
708  case 8: llvm_unreachable("Unsupported alignment size!");
709  }
710
711  OS << ' ' << ByteAlignment;
712  OS << ", " << truncateToSize(Value, ValueSize);
713  if (MaxBytesToEmit)
714    OS << ", " << MaxBytesToEmit;
715  EmitEOL();
716}
717
718void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
719                                      unsigned MaxBytesToEmit) {
720  // Emit with a text fill value.
721  EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
722                       1, MaxBytesToEmit);
723}
724
725void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
726                                      unsigned char Value) {
727  // FIXME: Verify that Offset is associated with the current section.
728  OS << ".org " << *Offset << ", " << (unsigned) Value;
729  EmitEOL();
730}
731
732
733void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
734  assert(MAI.hasSingleParameterDotFile());
735  OS << "\t.file\t";
736  PrintQuotedString(Filename, OS);
737  EmitEOL();
738}
739
740bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
741  if (UseLoc) {
742    OS << "\t.file\t" << FileNo << ' ';
743    PrintQuotedString(Filename, OS);
744    EmitEOL();
745  }
746  return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
747}
748
749void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
750                                          unsigned Column, unsigned Flags,
751                                          unsigned Isa,
752                                          unsigned Discriminator,
753                                          StringRef FileName) {
754  this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
755                                          Isa, Discriminator, FileName);
756  if (!UseLoc)
757    return;
758
759  OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
760  if (Flags & DWARF2_FLAG_BASIC_BLOCK)
761    OS << " basic_block";
762  if (Flags & DWARF2_FLAG_PROLOGUE_END)
763    OS << " prologue_end";
764  if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
765    OS << " epilogue_begin";
766
767  unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
768  if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
769    OS << " is_stmt ";
770
771    if (Flags & DWARF2_FLAG_IS_STMT)
772      OS << "1";
773    else
774      OS << "0";
775  }
776
777  if (Isa)
778    OS << "isa " << Isa;
779  if (Discriminator)
780    OS << "discriminator " << Discriminator;
781
782  if (IsVerboseAsm) {
783    OS.PadToColumn(MAI.getCommentColumn());
784    OS << MAI.getCommentString() << ' ' << FileName << ':'
785       << Line << ':' << Column;
786  }
787  EmitEOL();
788}
789
790void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
791  MCStreamer::EmitCFISections(EH, Debug);
792
793  if (!UseCFI)
794    return;
795
796  OS << "\t.cfi_sections ";
797  if (EH) {
798    OS << ".eh_frame";
799    if (Debug)
800      OS << ", .debug_frame";
801  } else if (Debug) {
802    OS << ".debug_frame";
803  }
804
805  EmitEOL();
806}
807
808void MCAsmStreamer::EmitCFIStartProc() {
809  MCStreamer::EmitCFIStartProc();
810
811  if (!UseCFI)
812    return;
813
814  OS << "\t.cfi_startproc";
815  EmitEOL();
816}
817
818void MCAsmStreamer::EmitCFIEndProc() {
819  MCStreamer::EmitCFIEndProc();
820
821  if (!UseCFI)
822    return;
823
824  OS << "\t.cfi_endproc";
825  EmitEOL();
826}
827
828void MCAsmStreamer::EmitRegisterName(int64_t Register) {
829  if (InstPrinter && !MAI.useDwarfRegNumForCFI()) {
830    const TargetAsmInfo &TAI = getContext().getTargetAsmInfo();
831    unsigned LLVMRegister = TAI.getLLVMRegNum(Register, true);
832    InstPrinter->printRegName(OS, LLVMRegister);
833  } else {
834    OS << Register;
835  }
836}
837
838void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
839  MCStreamer::EmitCFIDefCfa(Register, Offset);
840
841  if (!UseCFI)
842    return;
843
844  OS << "\t.cfi_def_cfa ";
845  EmitRegisterName(Register);
846  OS << ", " << Offset;
847  EmitEOL();
848}
849
850void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
851  MCStreamer::EmitCFIDefCfaOffset(Offset);
852
853  if (!UseCFI)
854    return;
855
856  OS << "\t.cfi_def_cfa_offset " << Offset;
857  EmitEOL();
858}
859
860void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
861  MCStreamer::EmitCFIDefCfaRegister(Register);
862
863  if (!UseCFI)
864    return;
865
866  OS << "\t.cfi_def_cfa_register ";
867  EmitRegisterName(Register);
868  EmitEOL();
869}
870
871void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
872  this->MCStreamer::EmitCFIOffset(Register, Offset);
873
874  if (!UseCFI)
875    return;
876
877  OS << "\t.cfi_offset ";
878  EmitRegisterName(Register);
879  OS << ", " << Offset;
880  EmitEOL();
881}
882
883void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
884                                       unsigned Encoding) {
885  MCStreamer::EmitCFIPersonality(Sym, Encoding);
886
887  if (!UseCFI)
888    return;
889
890  OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
891  EmitEOL();
892}
893
894void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
895  MCStreamer::EmitCFILsda(Sym, Encoding);
896
897  if (!UseCFI)
898    return;
899
900  OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
901  EmitEOL();
902}
903
904void MCAsmStreamer::EmitCFIRememberState() {
905  MCStreamer::EmitCFIRememberState();
906
907  if (!UseCFI)
908    return;
909
910  OS << "\t.cfi_remember_state";
911  EmitEOL();
912}
913
914void MCAsmStreamer::EmitCFIRestoreState() {
915  MCStreamer::EmitCFIRestoreState();
916
917  if (!UseCFI)
918    return;
919
920  OS << "\t.cfi_restore_state";
921  EmitEOL();
922}
923
924void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
925  MCStreamer::EmitCFISameValue(Register);
926
927  if (!UseCFI)
928    return;
929
930  OS << "\t.cfi_same_value ";
931  EmitRegisterName(Register);
932  EmitEOL();
933}
934
935void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
936  MCStreamer::EmitCFIRelOffset(Register, Offset);
937
938  if (!UseCFI)
939    return;
940
941  OS << "\t.cfi_rel_offset ";
942  EmitRegisterName(Register);
943  OS << ", " << Offset;
944  EmitEOL();
945}
946
947void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
948  MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
949
950  if (!UseCFI)
951    return;
952
953  OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
954  EmitEOL();
955}
956
957void MCAsmStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
958  MCStreamer::EmitWin64EHStartProc(Symbol);
959
960  OS << ".seh_proc " << *Symbol;
961  EmitEOL();
962}
963
964void MCAsmStreamer::EmitWin64EHEndProc() {
965  MCStreamer::EmitWin64EHEndProc();
966
967  OS << "\t.seh_endproc";
968  EmitEOL();
969}
970
971void MCAsmStreamer::EmitWin64EHStartChained() {
972  MCStreamer::EmitWin64EHStartChained();
973
974  OS << "\t.seh_startchained";
975  EmitEOL();
976}
977
978void MCAsmStreamer::EmitWin64EHEndChained() {
979  MCStreamer::EmitWin64EHEndChained();
980
981  OS << "\t.seh_endchained";
982  EmitEOL();
983}
984
985void MCAsmStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
986                                       bool Except) {
987  MCStreamer::EmitWin64EHHandler(Sym, Unwind, Except);
988
989  OS << "\t.seh_handler " << *Sym;
990  if (Unwind)
991    OS << ", @unwind";
992  if (Except)
993    OS << ", @except";
994  EmitEOL();
995}
996
997void MCAsmStreamer::EmitWin64EHHandlerData() {
998  MCStreamer::EmitWin64EHHandlerData();
999
1000  // Switch sections. Don't call SwitchSection directly, because that will
1001  // cause the section switch to be visible in the emitted assembly.
1002  // We only do this so the section switch that terminates the handler
1003  // data block is visible.
1004  MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
1005  StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
1006  const MCSection *xdataSect =
1007    getContext().getTargetAsmInfo().getWin64EHTableSection(suffix);
1008  if (xdataSect)
1009    SwitchSectionNoChange(xdataSect);
1010
1011  OS << "\t.seh_handlerdata";
1012  EmitEOL();
1013}
1014
1015void MCAsmStreamer::EmitWin64EHPushReg(unsigned Register) {
1016  MCStreamer::EmitWin64EHPushReg(Register);
1017
1018  OS << "\t.seh_pushreg " << Register;
1019  EmitEOL();
1020}
1021
1022void MCAsmStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
1023  MCStreamer::EmitWin64EHSetFrame(Register, Offset);
1024
1025  OS << "\t.seh_setframe " << Register << ", " << Offset;
1026  EmitEOL();
1027}
1028
1029void MCAsmStreamer::EmitWin64EHAllocStack(unsigned Size) {
1030  MCStreamer::EmitWin64EHAllocStack(Size);
1031
1032  OS << "\t.seh_stackalloc " << Size;
1033  EmitEOL();
1034}
1035
1036void MCAsmStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
1037  MCStreamer::EmitWin64EHSaveReg(Register, Offset);
1038
1039  OS << "\t.seh_savereg " << Register << ", " << Offset;
1040  EmitEOL();
1041}
1042
1043void MCAsmStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
1044  MCStreamer::EmitWin64EHSaveXMM(Register, Offset);
1045
1046  OS << "\t.seh_savexmm " << Register << ", " << Offset;
1047  EmitEOL();
1048}
1049
1050void MCAsmStreamer::EmitWin64EHPushFrame(bool Code) {
1051  MCStreamer::EmitWin64EHPushFrame(Code);
1052
1053  OS << "\t.seh_pushframe";
1054  if (Code)
1055    OS << " @code";
1056  EmitEOL();
1057}
1058
1059void MCAsmStreamer::EmitWin64EHEndProlog(void) {
1060  MCStreamer::EmitWin64EHEndProlog();
1061
1062  OS << "\t.seh_endprologue";
1063  EmitEOL();
1064}
1065
1066void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
1067  raw_ostream &OS = GetCommentOS();
1068  SmallString<256> Code;
1069  SmallVector<MCFixup, 4> Fixups;
1070  raw_svector_ostream VecOS(Code);
1071  Emitter->EncodeInstruction(Inst, VecOS, Fixups);
1072  VecOS.flush();
1073
1074  // If we are showing fixups, create symbolic markers in the encoded
1075  // representation. We do this by making a per-bit map to the fixup item index,
1076  // then trying to display it as nicely as possible.
1077  SmallVector<uint8_t, 64> FixupMap;
1078  FixupMap.resize(Code.size() * 8);
1079  for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1080    FixupMap[i] = 0;
1081
1082  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1083    MCFixup &F = Fixups[i];
1084    const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1085    for (unsigned j = 0; j != Info.TargetSize; ++j) {
1086      unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1087      assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1088      FixupMap[Index] = 1 + i;
1089    }
1090  }
1091
1092  // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1093  // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1094  OS << "encoding: [";
1095  for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1096    if (i)
1097      OS << ',';
1098
1099    // See if all bits are the same map entry.
1100    uint8_t MapEntry = FixupMap[i * 8 + 0];
1101    for (unsigned j = 1; j != 8; ++j) {
1102      if (FixupMap[i * 8 + j] == MapEntry)
1103        continue;
1104
1105      MapEntry = uint8_t(~0U);
1106      break;
1107    }
1108
1109    if (MapEntry != uint8_t(~0U)) {
1110      if (MapEntry == 0) {
1111        OS << format("0x%02x", uint8_t(Code[i]));
1112      } else {
1113        if (Code[i]) {
1114          // FIXME: Some of the 8 bits require fix up.
1115          OS << format("0x%02x", uint8_t(Code[i])) << '\''
1116             << char('A' + MapEntry - 1) << '\'';
1117        } else
1118          OS << char('A' + MapEntry - 1);
1119      }
1120    } else {
1121      // Otherwise, write out in binary.
1122      OS << "0b";
1123      for (unsigned j = 8; j--;) {
1124        unsigned Bit = (Code[i] >> j) & 1;
1125
1126        unsigned FixupBit;
1127        if (getContext().getAsmInfo().isLittleEndian())
1128          FixupBit = i * 8 + j;
1129        else
1130          FixupBit = i * 8 + (7-j);
1131
1132        if (uint8_t MapEntry = FixupMap[FixupBit]) {
1133          assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1134          OS << char('A' + MapEntry - 1);
1135        } else
1136          OS << Bit;
1137      }
1138    }
1139  }
1140  OS << "]\n";
1141
1142  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1143    MCFixup &F = Fixups[i];
1144    const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1145    OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1146       << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1147  }
1148}
1149
1150void MCAsmStreamer::EmitFnStart() {
1151  OS << "\t.fnstart";
1152  EmitEOL();
1153}
1154
1155void MCAsmStreamer::EmitFnEnd() {
1156  OS << "\t.fnend";
1157  EmitEOL();
1158}
1159
1160void MCAsmStreamer::EmitCantUnwind() {
1161  OS << "\t.cantunwind";
1162  EmitEOL();
1163}
1164
1165void MCAsmStreamer::EmitHandlerData() {
1166  OS << "\t.handlerdata";
1167  EmitEOL();
1168}
1169
1170void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
1171  OS << "\t.personality " << Personality->getName();
1172  EmitEOL();
1173}
1174
1175void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
1176  OS << "\t.setfp\t";
1177  InstPrinter->printRegName(OS, FpReg);
1178  OS << ", ";
1179  InstPrinter->printRegName(OS, SpReg);
1180  if (Offset)
1181    OS << ", #" << Offset;
1182  EmitEOL();
1183}
1184
1185void MCAsmStreamer::EmitPad(int64_t Offset) {
1186  OS << "\t.pad\t#" << Offset;
1187  EmitEOL();
1188}
1189
1190void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
1191                                bool isVector) {
1192  assert(RegList.size() && "RegList should not be empty");
1193  if (isVector)
1194    OS << "\t.vsave\t{";
1195  else
1196    OS << "\t.save\t{";
1197
1198  InstPrinter->printRegName(OS, RegList[0]);
1199
1200  for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
1201    OS << ", ";
1202    InstPrinter->printRegName(OS, RegList[i]);
1203  }
1204
1205  OS << "}";
1206  EmitEOL();
1207}
1208
1209void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
1210  assert(getCurrentSection() && "Cannot emit contents before setting section!");
1211
1212  // Show the encoding in a comment if we have a code emitter.
1213  if (Emitter)
1214    AddEncodingComment(Inst);
1215
1216  // Show the MCInst if enabled.
1217  if (ShowInst) {
1218    Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
1219    GetCommentOS() << "\n";
1220  }
1221
1222  // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
1223  if (InstPrinter)
1224    InstPrinter->printInst(&Inst, OS);
1225  else
1226    Inst.print(OS, &MAI);
1227  EmitEOL();
1228}
1229
1230/// EmitRawText - If this file is backed by an assembly streamer, this dumps
1231/// the specified string in the output .s file.  This capability is
1232/// indicated by the hasRawTextSupport() predicate.
1233void MCAsmStreamer::EmitRawText(StringRef String) {
1234  if (!String.empty() && String.back() == '\n')
1235    String = String.substr(0, String.size()-1);
1236  OS << String;
1237  EmitEOL();
1238}
1239
1240void MCAsmStreamer::Finish() {
1241  // Dump out the dwarf file & directory tables and line tables.
1242  if (getContext().hasDwarfFiles() && !UseLoc)
1243    MCDwarfFileTable::Emit(this);
1244
1245  if (!UseCFI)
1246    EmitFrames(false);
1247}
1248MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1249                                    formatted_raw_ostream &OS,
1250                                    bool isVerboseAsm, bool useLoc,
1251                                    bool useCFI, MCInstPrinter *IP,
1252                                    MCCodeEmitter *CE, TargetAsmBackend *TAB,
1253                                    bool ShowInst) {
1254  return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc, useCFI,
1255                           IP, CE, TAB, ShowInst);
1256}
1257