MCAsmStreamer.cpp revision dce4a407a24b04eebc6a376f8e62b41aaa7b071f 
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/ADT/SmallString.h"
12#include "llvm/ADT/STLExtras.h"
13#include "llvm/ADT/StringExtras.h"
14#include "llvm/ADT/Twine.h"
15#include "llvm/MC/MCAsmBackend.h"
16#include "llvm/MC/MCAsmInfo.h"
17#include "llvm/MC/MCCodeEmitter.h"
18#include "llvm/MC/MCContext.h"
19#include "llvm/MC/MCExpr.h"
20#include "llvm/MC/MCFixupKindInfo.h"
21#include "llvm/MC/MCInst.h"
22#include "llvm/MC/MCInstPrinter.h"
23#include "llvm/MC/MCObjectFileInfo.h"
24#include "llvm/MC/MCRegisterInfo.h"
25#include "llvm/MC/MCSectionCOFF.h"
26#include "llvm/MC/MCSectionMachO.h"
27#include "llvm/MC/MCSymbol.h"
28#include "llvm/Support/CommandLine.h"
29#include "llvm/Support/ErrorHandling.h"
30#include "llvm/Support/Format.h"
31#include "llvm/Support/FormattedStream.h"
32#include "llvm/Support/MathExtras.h"
33#include "llvm/Support/Path.h"
34#include <cctype>
35#include <unordered_map>
36using namespace llvm;
37
38namespace {
39
40class MCAsmStreamer : public MCStreamer {
41protected:
42  formatted_raw_ostream &OS;
43  const MCAsmInfo *MAI;
44private:
45  std::unique_ptr<MCInstPrinter> InstPrinter;
46  std::unique_ptr<MCCodeEmitter> Emitter;
47  std::unique_ptr<MCAsmBackend> AsmBackend;
48
49  SmallString<128> CommentToEmit;
50  raw_svector_ostream CommentStream;
51
52  unsigned IsVerboseAsm : 1;
53  unsigned ShowInst : 1;
54  unsigned UseDwarfDirectory : 1;
55
56  void EmitRegisterName(int64_t Register);
57  void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) override;
58  void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override;
59
60public:
61  MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
62                bool isVerboseAsm, bool useDwarfDirectory,
63                MCInstPrinter *printer, MCCodeEmitter *emitter,
64                MCAsmBackend *asmbackend, bool showInst)
65      : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
66        InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
67        CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
68        ShowInst(showInst), UseDwarfDirectory(useDwarfDirectory) {
69    if (InstPrinter && IsVerboseAsm)
70      InstPrinter->setCommentStream(CommentStream);
71  }
72
73  inline void EmitEOL() {
74    // If we don't have any comments, just emit a \n.
75    if (!IsVerboseAsm) {
76      OS << '\n';
77      return;
78    }
79    EmitCommentsAndEOL();
80  }
81  void EmitCommentsAndEOL();
82
83  /// isVerboseAsm - Return true if this streamer supports verbose assembly at
84  /// all.
85  bool isVerboseAsm() const override { return IsVerboseAsm; }
86
87  /// hasRawTextSupport - We support EmitRawText.
88  bool hasRawTextSupport() const override { return true; }
89
90  /// AddComment - Add a comment that can be emitted to the generated .s
91  /// file if applicable as a QoI issue to make the output of the compiler
92  /// more readable.  This only affects the MCAsmStreamer, and only when
93  /// verbose assembly output is enabled.
94  void AddComment(const Twine &T) override;
95
96  /// AddEncodingComment - Add a comment showing the encoding of an instruction.
97  void AddEncodingComment(const MCInst &Inst, const MCSubtargetInfo &);
98
99  /// GetCommentOS - Return a raw_ostream that comments can be written to.
100  /// Unlike AddComment, you are required to terminate comments with \n if you
101  /// use this method.
102  raw_ostream &GetCommentOS() override {
103    if (!IsVerboseAsm)
104      return nulls();  // Discard comments unless in verbose asm mode.
105    return CommentStream;
106  }
107
108  void emitRawComment(const Twine &T, bool TabPrefix = true) override;
109
110  /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
111  void AddBlankLine() override {
112    EmitEOL();
113  }
114
115  /// @name MCStreamer Interface
116  /// @{
117
118  void ChangeSection(const MCSection *Section,
119                     const MCExpr *Subsection) override;
120
121  void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override;
122  void EmitLabel(MCSymbol *Symbol) override;
123  void EmitDebugLabel(MCSymbol *Symbol) override;
124
125  void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
126  void EmitLinkerOptions(ArrayRef<std::string> Options) override;
127  void EmitDataRegion(MCDataRegionType Kind) override;
128  void EmitVersionMin(MCVersionMinType Kind, unsigned Major, unsigned Minor,
129                      unsigned Update) override;
130  void EmitThumbFunc(MCSymbol *Func) override;
131
132  void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
133  void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
134  bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
135
136  void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
137  void BeginCOFFSymbolDef(const MCSymbol *Symbol) override;
138  void EmitCOFFSymbolStorageClass(int StorageClass) override;
139  void EmitCOFFSymbolType(int Type) override;
140  void EndCOFFSymbolDef() override;
141  void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
142  void EmitCOFFSecRel32(MCSymbol const *Symbol) override;
143  void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
144  void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
145                        unsigned ByteAlignment) override;
146
147  /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
148  ///
149  /// @param Symbol - The common symbol to emit.
150  /// @param Size - The size of the common symbol.
151  /// @param ByteAlignment - The alignment of the common symbol in bytes.
152  void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
153                             unsigned ByteAlignment) override;
154
155  void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = nullptr,
156                    uint64_t Size = 0, unsigned ByteAlignment = 0) override;
157
158  void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
159                       uint64_t Size, unsigned ByteAlignment = 0) override;
160
161  void EmitBytes(StringRef Data) override;
162
163  void EmitValueImpl(const MCExpr *Value, unsigned Size,
164                     const SMLoc &Loc = SMLoc()) override;
165  void EmitIntValue(uint64_t Value, unsigned Size) override;
166
167  void EmitULEB128Value(const MCExpr *Value) override;
168
169  void EmitSLEB128Value(const MCExpr *Value) override;
170
171  void EmitGPRel64Value(const MCExpr *Value) override;
172
173  void EmitGPRel32Value(const MCExpr *Value) override;
174
175
176  void EmitFill(uint64_t NumBytes, uint8_t FillValue) override;
177
178  void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
179                            unsigned ValueSize = 1,
180                            unsigned MaxBytesToEmit = 0) override;
181
182  void EmitCodeAlignment(unsigned ByteAlignment,
183                         unsigned MaxBytesToEmit = 0) override;
184
185  bool EmitValueToOffset(const MCExpr *Offset,
186                         unsigned char Value = 0) override;
187
188  void EmitFileDirective(StringRef Filename) override;
189  unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
190                                  StringRef Filename,
191                                  unsigned CUID = 0) override;
192  void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
193                             unsigned Column, unsigned Flags,
194                             unsigned Isa, unsigned Discriminator,
195                             StringRef FileName) override;
196  MCSymbol *getDwarfLineTableSymbol(unsigned CUID) override;
197
198  void EmitIdent(StringRef IdentString) override;
199  void EmitCFISections(bool EH, bool Debug) override;
200  void EmitCFIDefCfa(int64_t Register, int64_t Offset) override;
201  void EmitCFIDefCfaOffset(int64_t Offset) override;
202  void EmitCFIDefCfaRegister(int64_t Register) override;
203  void EmitCFIOffset(int64_t Register, int64_t Offset) override;
204  void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding) override;
205  void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) override;
206  void EmitCFIRememberState() override;
207  void EmitCFIRestoreState() override;
208  void EmitCFISameValue(int64_t Register) override;
209  void EmitCFIRelOffset(int64_t Register, int64_t Offset) override;
210  void EmitCFIAdjustCfaOffset(int64_t Adjustment) override;
211  void EmitCFISignalFrame() override;
212  void EmitCFIUndefined(int64_t Register) override;
213  void EmitCFIRegister(int64_t Register1, int64_t Register2) override;
214  void EmitCFIWindowSave() override;
215
216  void EmitWin64EHStartProc(const MCSymbol *Symbol) override;
217  void EmitWin64EHEndProc() override;
218  void EmitWin64EHStartChained() override;
219  void EmitWin64EHEndChained() override;
220  void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
221                          bool Except) override;
222  void EmitWin64EHHandlerData() override;
223  void EmitWin64EHPushReg(unsigned Register) override;
224  void EmitWin64EHSetFrame(unsigned Register, unsigned Offset) override;
225  void EmitWin64EHAllocStack(unsigned Size) override;
226  void EmitWin64EHSaveReg(unsigned Register, unsigned Offset) override;
227  void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) override;
228  void EmitWin64EHPushFrame(bool Code) override;
229  void EmitWin64EHEndProlog() override;
230
231  void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
232
233  void EmitBundleAlignMode(unsigned AlignPow2) override;
234  void EmitBundleLock(bool AlignToEnd) override;
235  void EmitBundleUnlock() override;
236
237  /// EmitRawText - If this file is backed by an assembly streamer, this dumps
238  /// the specified string in the output .s file.  This capability is
239  /// indicated by the hasRawTextSupport() predicate.
240  void EmitRawTextImpl(StringRef String) override;
241
242  void FinishImpl() override;
243};
244
245} // end anonymous namespace.
246
247/// AddComment - Add a comment that can be emitted to the generated .s
248/// file if applicable as a QoI issue to make the output of the compiler
249/// more readable.  This only affects the MCAsmStreamer, and only when
250/// verbose assembly output is enabled.
251void MCAsmStreamer::AddComment(const Twine &T) {
252  if (!IsVerboseAsm) return;
253
254  // Make sure that CommentStream is flushed.
255  CommentStream.flush();
256
257  T.toVector(CommentToEmit);
258  // Each comment goes on its own line.
259  CommentToEmit.push_back('\n');
260
261  // Tell the comment stream that the vector changed underneath it.
262  CommentStream.resync();
263}
264
265void MCAsmStreamer::EmitCommentsAndEOL() {
266  if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
267    OS << '\n';
268    return;
269  }
270
271  CommentStream.flush();
272  StringRef Comments = CommentToEmit.str();
273
274  assert(Comments.back() == '\n' &&
275         "Comment array not newline terminated");
276  do {
277    // Emit a line of comments.
278    OS.PadToColumn(MAI->getCommentColumn());
279    size_t Position = Comments.find('\n');
280    OS << MAI->getCommentString() << ' ' << Comments.substr(0, Position) <<'\n';
281
282    Comments = Comments.substr(Position+1);
283  } while (!Comments.empty());
284
285  CommentToEmit.clear();
286  // Tell the comment stream that the vector changed underneath it.
287  CommentStream.resync();
288}
289
290static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
291  assert(Bytes && "Invalid size!");
292  return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
293}
294
295void MCAsmStreamer::emitRawComment(const Twine &T, bool TabPrefix) {
296  if (TabPrefix)
297    OS << '\t';
298  OS << MAI->getCommentString() << T;
299  EmitEOL();
300}
301
302void MCAsmStreamer::ChangeSection(const MCSection *Section,
303                                  const MCExpr *Subsection) {
304  assert(Section && "Cannot switch to a null section!");
305  Section->PrintSwitchToSection(*MAI, OS, Subsection);
306}
307
308void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
309  assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
310  MCStreamer::EmitLabel(Symbol);
311
312  OS << *Symbol << MAI->getLabelSuffix();
313  EmitEOL();
314}
315
316void MCAsmStreamer::EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {
317  StringRef str = MCLOHIdToName(Kind);
318
319#ifndef NDEBUG
320  int NbArgs = MCLOHIdToNbArgs(Kind);
321  assert(NbArgs != -1 && ((size_t)NbArgs) == Args.size() && "Malformed LOH!");
322  assert(str != "" && "Invalid LOH name");
323#endif
324
325  OS << "\t" << MCLOHDirectiveName() << " " << str << "\t";
326  bool IsFirst = true;
327  for (MCLOHArgs::const_iterator It = Args.begin(), EndIt = Args.end();
328       It != EndIt; ++It) {
329    if (!IsFirst)
330      OS << ", ";
331    IsFirst = false;
332    OS << **It;
333  }
334  EmitEOL();
335}
336
337void MCAsmStreamer::EmitDebugLabel(MCSymbol *Symbol) {
338  assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
339  MCStreamer::EmitDebugLabel(Symbol);
340
341  OS << *Symbol << MAI->getDebugLabelSuffix();
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::EmitLinkerOptions(ArrayRef<std::string> Options) {
357  assert(!Options.empty() && "At least one option is required!");
358  OS << "\t.linker_option \"" << Options[0] << '"';
359  for (ArrayRef<std::string>::iterator it = Options.begin() + 1,
360         ie = Options.end(); it != ie; ++it) {
361    OS << ", " << '"' << *it << '"';
362  }
363  OS << "\n";
364}
365
366void MCAsmStreamer::EmitDataRegion(MCDataRegionType Kind) {
367  if (!MAI->doesSupportDataRegionDirectives())
368    return;
369  switch (Kind) {
370  case MCDR_DataRegion:            OS << "\t.data_region"; break;
371  case MCDR_DataRegionJT8:         OS << "\t.data_region jt8"; break;
372  case MCDR_DataRegionJT16:        OS << "\t.data_region jt16"; break;
373  case MCDR_DataRegionJT32:        OS << "\t.data_region jt32"; break;
374  case MCDR_DataRegionEnd:         OS << "\t.end_data_region"; break;
375  }
376  EmitEOL();
377}
378
379void MCAsmStreamer::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
380                                   unsigned Minor, unsigned Update) {
381  switch (Kind) {
382  case MCVM_IOSVersionMin:        OS << "\t.ios_version_min"; break;
383  case MCVM_OSXVersionMin:        OS << "\t.macosx_version_min"; break;
384  }
385  OS << " " << Major << ", " << Minor;
386  if (Update)
387    OS << ", " << Update;
388  EmitEOL();
389}
390
391void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
392  // This needs to emit to a temporary string to get properly quoted
393  // MCSymbols when they have spaces in them.
394  OS << "\t.thumb_func";
395  // Only Mach-O hasSubsectionsViaSymbols()
396  if (MAI->hasSubsectionsViaSymbols())
397    OS << '\t' << *Func;
398  EmitEOL();
399}
400
401void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
402  OS << *Symbol << " = " << *Value;
403  EmitEOL();
404
405  MCStreamer::EmitAssignment(Symbol, Value);
406}
407
408void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
409  OS << ".weakref " << *Alias << ", " << *Symbol;
410  EmitEOL();
411}
412
413bool MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
414                                        MCSymbolAttr Attribute) {
415  switch (Attribute) {
416  case MCSA_Invalid: llvm_unreachable("Invalid symbol attribute");
417  case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
418  case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
419  case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
420  case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
421  case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
422  case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
423  case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
424    if (!MAI->hasDotTypeDotSizeDirective())
425      return false; // Symbol attribute not supported
426    OS << "\t.type\t" << *Symbol << ','
427       << ((MAI->getCommentString()[0] != '@') ? '@' : '%');
428    switch (Attribute) {
429    default: return false;
430    case MCSA_ELF_TypeFunction:    OS << "function"; break;
431    case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
432    case MCSA_ELF_TypeObject:      OS << "object"; break;
433    case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
434    case MCSA_ELF_TypeCommon:      OS << "common"; break;
435    case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
436    case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
437    }
438    EmitEOL();
439    return true;
440  case MCSA_Global: // .globl/.global
441    OS << MAI->getGlobalDirective();
442    break;
443  case MCSA_Hidden:         OS << "\t.hidden\t";          break;
444  case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
445  case MCSA_Internal:       OS << "\t.internal\t";        break;
446  case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
447  case MCSA_Local:          OS << "\t.local\t";           break;
448  case MCSA_NoDeadStrip:    OS << "\t.no_dead_strip\t";   break;
449  case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
450  case MCSA_PrivateExtern:
451    OS << "\t.private_extern\t";
452    break;
453  case MCSA_Protected:      OS << "\t.protected\t";       break;
454  case MCSA_Reference:      OS << "\t.reference\t";       break;
455  case MCSA_Weak:           OS << "\t.weak\t";            break;
456  case MCSA_WeakDefinition:
457    OS << "\t.weak_definition\t";
458    break;
459      // .weak_reference
460  case MCSA_WeakReference:  OS << MAI->getWeakRefDirective(); break;
461  case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
462  }
463
464  OS << *Symbol;
465  EmitEOL();
466
467  return true;
468}
469
470void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
471  OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
472  EmitEOL();
473}
474
475void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
476  OS << "\t.def\t " << *Symbol << ';';
477  EmitEOL();
478}
479
480void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
481  OS << "\t.scl\t" << StorageClass << ';';
482  EmitEOL();
483}
484
485void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
486  OS << "\t.type\t" << Type << ';';
487  EmitEOL();
488}
489
490void MCAsmStreamer::EndCOFFSymbolDef() {
491  OS << "\t.endef";
492  EmitEOL();
493}
494
495void MCAsmStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
496  OS << "\t.secidx\t" << *Symbol;
497  EmitEOL();
498}
499
500void MCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
501  OS << "\t.secrel32\t" << *Symbol;
502  EmitEOL();
503}
504
505void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
506  assert(MAI->hasDotTypeDotSizeDirective());
507  OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
508}
509
510void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
511                                     unsigned ByteAlignment) {
512  // Common symbols do not belong to any actual section.
513  AssignSection(Symbol, nullptr);
514
515  OS << "\t.comm\t" << *Symbol << ',' << Size;
516  if (ByteAlignment != 0) {
517    if (MAI->getCOMMDirectiveAlignmentIsInBytes())
518      OS << ',' << ByteAlignment;
519    else
520      OS << ',' << Log2_32(ByteAlignment);
521  }
522  EmitEOL();
523}
524
525/// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
526///
527/// @param Symbol - The common symbol to emit.
528/// @param Size - The size of the common symbol.
529void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
530                                          unsigned ByteAlign) {
531  // Common symbols do not belong to any actual section.
532  AssignSection(Symbol, nullptr);
533
534  OS << "\t.lcomm\t" << *Symbol << ',' << Size;
535  if (ByteAlign > 1) {
536    switch (MAI->getLCOMMDirectiveAlignmentType()) {
537    case LCOMM::NoAlignment:
538      llvm_unreachable("alignment not supported on .lcomm!");
539    case LCOMM::ByteAlignment:
540      OS << ',' << ByteAlign;
541      break;
542    case LCOMM::Log2Alignment:
543      assert(isPowerOf2_32(ByteAlign) && "alignment must be a power of 2");
544      OS << ',' << Log2_32(ByteAlign);
545      break;
546    }
547  }
548  EmitEOL();
549}
550
551void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
552                                 uint64_t Size, unsigned ByteAlignment) {
553  if (Symbol)
554    AssignSection(Symbol, Section);
555
556  // Note: a .zerofill directive does not switch sections.
557  OS << ".zerofill ";
558
559  // This is a mach-o specific directive.
560  const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
561  OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
562
563  if (Symbol) {
564    OS << ',' << *Symbol << ',' << Size;
565    if (ByteAlignment != 0)
566      OS << ',' << Log2_32(ByteAlignment);
567  }
568  EmitEOL();
569}
570
571// .tbss sym, size, align
572// This depends that the symbol has already been mangled from the original,
573// e.g. _a.
574void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
575                                   uint64_t Size, unsigned ByteAlignment) {
576  AssignSection(Symbol, Section);
577
578  assert(Symbol && "Symbol shouldn't be NULL!");
579  // Instead of using the Section we'll just use the shortcut.
580  // This is a mach-o specific directive and section.
581  OS << ".tbss " << *Symbol << ", " << Size;
582
583  // Output align if we have it.  We default to 1 so don't bother printing
584  // that.
585  if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
586
587  EmitEOL();
588}
589
590static inline char toOctal(int X) { return (X&7)+'0'; }
591
592static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
593  OS << '"';
594
595  for (unsigned i = 0, e = Data.size(); i != e; ++i) {
596    unsigned char C = Data[i];
597    if (C == '"' || C == '\\') {
598      OS << '\\' << (char)C;
599      continue;
600    }
601
602    if (isprint((unsigned char)C)) {
603      OS << (char)C;
604      continue;
605    }
606
607    switch (C) {
608      case '\b': OS << "\\b"; break;
609      case '\f': OS << "\\f"; break;
610      case '\n': OS << "\\n"; break;
611      case '\r': OS << "\\r"; break;
612      case '\t': OS << "\\t"; break;
613      default:
614        OS << '\\';
615        OS << toOctal(C >> 6);
616        OS << toOctal(C >> 3);
617        OS << toOctal(C >> 0);
618        break;
619    }
620  }
621
622  OS << '"';
623}
624
625
626void MCAsmStreamer::EmitBytes(StringRef Data) {
627  assert(getCurrentSection().first &&
628         "Cannot emit contents before setting section!");
629  if (Data.empty()) return;
630
631  if (Data.size() == 1) {
632    OS << MAI->getData8bitsDirective();
633    OS << (unsigned)(unsigned char)Data[0];
634    EmitEOL();
635    return;
636  }
637
638  // If the data ends with 0 and the target supports .asciz, use it, otherwise
639  // use .ascii
640  if (MAI->getAscizDirective() && Data.back() == 0) {
641    OS << MAI->getAscizDirective();
642    Data = Data.substr(0, Data.size()-1);
643  } else {
644    OS << MAI->getAsciiDirective();
645  }
646
647  PrintQuotedString(Data, OS);
648  EmitEOL();
649}
650
651void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
652  EmitValue(MCConstantExpr::Create(Value, getContext()), Size);
653}
654
655void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
656                                  const SMLoc &Loc) {
657  assert(Size <= 8 && "Invalid size");
658  assert(getCurrentSection().first &&
659         "Cannot emit contents before setting section!");
660  const char *Directive = nullptr;
661  switch (Size) {
662  default: break;
663  case 1: Directive = MAI->getData8bitsDirective();  break;
664  case 2: Directive = MAI->getData16bitsDirective(); break;
665  case 4: Directive = MAI->getData32bitsDirective(); break;
666  case 8: Directive = MAI->getData64bitsDirective(); break;
667  }
668
669  if (!Directive) {
670    int64_t IntValue;
671    if (!Value->EvaluateAsAbsolute(IntValue))
672      report_fatal_error("Don't know how to emit this value.");
673
674    // We couldn't handle the requested integer size so we fallback by breaking
675    // the request down into several, smaller, integers.  Since sizes greater
676    // than eight are invalid and size equivalent to eight should have been
677    // handled earlier, we use four bytes as our largest piece of granularity.
678    bool IsLittleEndian = MAI->isLittleEndian();
679    for (unsigned Emitted = 0; Emitted != Size;) {
680      unsigned Remaining = Size - Emitted;
681      // The size of our partial emission must be a power of two less than
682      // eight.
683      unsigned EmissionSize = PowerOf2Floor(Remaining);
684      if (EmissionSize > 4)
685        EmissionSize = 4;
686      // Calculate the byte offset of our partial emission taking into account
687      // the endianness of the target.
688      unsigned ByteOffset =
689          IsLittleEndian ? Emitted : (Remaining - EmissionSize);
690      uint64_t ValueToEmit = IntValue >> (ByteOffset * 8);
691      // We truncate our partial emission to fit within the bounds of the
692      // emission domain.  This produces nicer output and silences potential
693      // truncation warnings when round tripping through another assembler.
694      ValueToEmit &= ~0ULL >> (64 - EmissionSize * 8);
695      EmitIntValue(ValueToEmit, EmissionSize);
696      Emitted += EmissionSize;
697    }
698    return;
699  }
700
701  assert(Directive && "Invalid size for machine code value!");
702  OS << Directive << *Value;
703  EmitEOL();
704}
705
706void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
707  int64_t IntValue;
708  if (Value->EvaluateAsAbsolute(IntValue)) {
709    EmitULEB128IntValue(IntValue);
710    return;
711  }
712  assert(MAI->hasLEB128() && "Cannot print a .uleb");
713  OS << ".uleb128 " << *Value;
714  EmitEOL();
715}
716
717void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
718  int64_t IntValue;
719  if (Value->EvaluateAsAbsolute(IntValue)) {
720    EmitSLEB128IntValue(IntValue);
721    return;
722  }
723  assert(MAI->hasLEB128() && "Cannot print a .sleb");
724  OS << ".sleb128 " << *Value;
725  EmitEOL();
726}
727
728void MCAsmStreamer::EmitGPRel64Value(const MCExpr *Value) {
729  assert(MAI->getGPRel64Directive() != nullptr);
730  OS << MAI->getGPRel64Directive() << *Value;
731  EmitEOL();
732}
733
734void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
735  assert(MAI->getGPRel32Directive() != nullptr);
736  OS << MAI->getGPRel32Directive() << *Value;
737  EmitEOL();
738}
739
740
741/// EmitFill - Emit NumBytes bytes worth of the value specified by
742/// FillValue.  This implements directives such as '.space'.
743void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
744  if (NumBytes == 0) return;
745
746  if (const char *ZeroDirective = MAI->getZeroDirective()) {
747    OS << ZeroDirective << NumBytes;
748    if (FillValue != 0)
749      OS << ',' << (int)FillValue;
750    EmitEOL();
751    return;
752  }
753
754  // Emit a byte at a time.
755  MCStreamer::EmitFill(NumBytes, FillValue);
756}
757
758void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
759                                         unsigned ValueSize,
760                                         unsigned MaxBytesToEmit) {
761  // Some assemblers don't support non-power of two alignments, so we always
762  // emit alignments as a power of two if possible.
763  if (isPowerOf2_32(ByteAlignment)) {
764    switch (ValueSize) {
765    default:
766      llvm_unreachable("Invalid size for machine code value!");
767    case 1:
768      OS << "\t.align\t";
769      break;
770    case 2:
771      OS << ".p2alignw ";
772      break;
773    case 4:
774      OS << ".p2alignl ";
775      break;
776    case 8:
777      llvm_unreachable("Unsupported alignment size!");
778    }
779
780    if (MAI->getAlignmentIsInBytes())
781      OS << ByteAlignment;
782    else
783      OS << Log2_32(ByteAlignment);
784
785    if (Value || MaxBytesToEmit) {
786      OS << ", 0x";
787      OS.write_hex(truncateToSize(Value, ValueSize));
788
789      if (MaxBytesToEmit)
790        OS << ", " << MaxBytesToEmit;
791    }
792    EmitEOL();
793    return;
794  }
795
796  // Non-power of two alignment.  This is not widely supported by assemblers.
797  // FIXME: Parameterize this based on MAI.
798  switch (ValueSize) {
799  default: llvm_unreachable("Invalid size for machine code value!");
800  case 1: OS << ".balign";  break;
801  case 2: OS << ".balignw"; break;
802  case 4: OS << ".balignl"; break;
803  case 8: llvm_unreachable("Unsupported alignment size!");
804  }
805
806  OS << ' ' << ByteAlignment;
807  OS << ", " << truncateToSize(Value, ValueSize);
808  if (MaxBytesToEmit)
809    OS << ", " << MaxBytesToEmit;
810  EmitEOL();
811}
812
813void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
814                                      unsigned MaxBytesToEmit) {
815  // Emit with a text fill value.
816  EmitValueToAlignment(ByteAlignment, MAI->getTextAlignFillValue(),
817                       1, MaxBytesToEmit);
818}
819
820bool MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
821                                      unsigned char Value) {
822  // FIXME: Verify that Offset is associated with the current section.
823  OS << ".org " << *Offset << ", " << (unsigned) Value;
824  EmitEOL();
825  return false;
826}
827
828
829void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
830  assert(MAI->hasSingleParameterDotFile());
831  OS << "\t.file\t";
832  PrintQuotedString(Filename, OS);
833  EmitEOL();
834}
835
836unsigned MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo,
837                                               StringRef Directory,
838                                               StringRef Filename,
839                                               unsigned CUID) {
840  assert(CUID == 0);
841
842  MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
843  unsigned NumFiles = Table.getMCDwarfFiles().size();
844  FileNo = Table.getFile(Directory, Filename, FileNo);
845  if (FileNo == 0)
846    return 0;
847  if (NumFiles == Table.getMCDwarfFiles().size())
848    return FileNo;
849
850  SmallString<128> FullPathName;
851
852  if (!UseDwarfDirectory && !Directory.empty()) {
853    if (sys::path::is_absolute(Filename))
854      Directory = "";
855    else {
856      FullPathName = Directory;
857      sys::path::append(FullPathName, Filename);
858      Directory = "";
859      Filename = FullPathName;
860    }
861  }
862
863  OS << "\t.file\t" << FileNo << ' ';
864  if (!Directory.empty()) {
865    PrintQuotedString(Directory, OS);
866    OS << ' ';
867  }
868  PrintQuotedString(Filename, OS);
869  EmitEOL();
870
871  return FileNo;
872}
873
874void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
875                                          unsigned Column, unsigned Flags,
876                                          unsigned Isa,
877                                          unsigned Discriminator,
878                                          StringRef FileName) {
879  this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
880                                          Isa, Discriminator, FileName);
881  OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
882  if (Flags & DWARF2_FLAG_BASIC_BLOCK)
883    OS << " basic_block";
884  if (Flags & DWARF2_FLAG_PROLOGUE_END)
885    OS << " prologue_end";
886  if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
887    OS << " epilogue_begin";
888
889  unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
890  if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
891    OS << " is_stmt ";
892
893    if (Flags & DWARF2_FLAG_IS_STMT)
894      OS << "1";
895    else
896      OS << "0";
897  }
898
899  if (Isa)
900    OS << " isa " << Isa;
901  if (Discriminator)
902    OS << " discriminator " << Discriminator;
903
904  if (IsVerboseAsm) {
905    OS.PadToColumn(MAI->getCommentColumn());
906    OS << MAI->getCommentString() << ' ' << FileName << ':'
907       << Line << ':' << Column;
908  }
909  EmitEOL();
910}
911
912MCSymbol *MCAsmStreamer::getDwarfLineTableSymbol(unsigned CUID) {
913  // Always use the zeroth line table, since asm syntax only supports one line
914  // table for now.
915  return MCStreamer::getDwarfLineTableSymbol(0);
916}
917
918void MCAsmStreamer::EmitIdent(StringRef IdentString) {
919  assert(MAI->hasIdentDirective() && ".ident directive not supported");
920  OS << "\t.ident\t";
921  PrintQuotedString(IdentString, OS);
922  EmitEOL();
923}
924
925void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
926  MCStreamer::EmitCFISections(EH, Debug);
927  OS << "\t.cfi_sections ";
928  if (EH) {
929    OS << ".eh_frame";
930    if (Debug)
931      OS << ", .debug_frame";
932  } else if (Debug) {
933    OS << ".debug_frame";
934  }
935
936  EmitEOL();
937}
938
939void MCAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
940  OS << "\t.cfi_startproc";
941  if (Frame.IsSimple)
942    OS << " simple";
943  EmitEOL();
944}
945
946void MCAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
947  // Put a dummy non-null value in Frame.End to mark that this frame has been
948  // closed.
949  Frame.End = (MCSymbol *) 1;
950
951  OS << "\t.cfi_endproc";
952  EmitEOL();
953}
954
955void MCAsmStreamer::EmitRegisterName(int64_t Register) {
956  if (InstPrinter && !MAI->useDwarfRegNumForCFI()) {
957    const MCRegisterInfo *MRI = getContext().getRegisterInfo();
958    unsigned LLVMRegister = MRI->getLLVMRegNum(Register, true);
959    InstPrinter->printRegName(OS, LLVMRegister);
960  } else {
961    OS << Register;
962  }
963}
964
965void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
966  MCStreamer::EmitCFIDefCfa(Register, Offset);
967  OS << "\t.cfi_def_cfa ";
968  EmitRegisterName(Register);
969  OS << ", " << Offset;
970  EmitEOL();
971}
972
973void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
974  MCStreamer::EmitCFIDefCfaOffset(Offset);
975  OS << "\t.cfi_def_cfa_offset " << Offset;
976  EmitEOL();
977}
978
979void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
980  MCStreamer::EmitCFIDefCfaRegister(Register);
981  OS << "\t.cfi_def_cfa_register ";
982  EmitRegisterName(Register);
983  EmitEOL();
984}
985
986void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
987  this->MCStreamer::EmitCFIOffset(Register, Offset);
988  OS << "\t.cfi_offset ";
989  EmitRegisterName(Register);
990  OS << ", " << Offset;
991  EmitEOL();
992}
993
994void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
995                                       unsigned Encoding) {
996  MCStreamer::EmitCFIPersonality(Sym, Encoding);
997  OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
998  EmitEOL();
999}
1000
1001void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
1002  MCStreamer::EmitCFILsda(Sym, Encoding);
1003  OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
1004  EmitEOL();
1005}
1006
1007void MCAsmStreamer::EmitCFIRememberState() {
1008  MCStreamer::EmitCFIRememberState();
1009  OS << "\t.cfi_remember_state";
1010  EmitEOL();
1011}
1012
1013void MCAsmStreamer::EmitCFIRestoreState() {
1014  MCStreamer::EmitCFIRestoreState();
1015  OS << "\t.cfi_restore_state";
1016  EmitEOL();
1017}
1018
1019void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
1020  MCStreamer::EmitCFISameValue(Register);
1021  OS << "\t.cfi_same_value ";
1022  EmitRegisterName(Register);
1023  EmitEOL();
1024}
1025
1026void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
1027  MCStreamer::EmitCFIRelOffset(Register, Offset);
1028  OS << "\t.cfi_rel_offset ";
1029  EmitRegisterName(Register);
1030  OS << ", " << Offset;
1031  EmitEOL();
1032}
1033
1034void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
1035  MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
1036  OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
1037  EmitEOL();
1038}
1039
1040void MCAsmStreamer::EmitCFISignalFrame() {
1041  MCStreamer::EmitCFISignalFrame();
1042  OS << "\t.cfi_signal_frame";
1043  EmitEOL();
1044}
1045
1046void MCAsmStreamer::EmitCFIUndefined(int64_t Register) {
1047  MCStreamer::EmitCFIUndefined(Register);
1048  OS << "\t.cfi_undefined " << Register;
1049  EmitEOL();
1050}
1051
1052void MCAsmStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
1053  MCStreamer::EmitCFIRegister(Register1, Register2);
1054  OS << "\t.cfi_register " << Register1 << ", " << Register2;
1055  EmitEOL();
1056}
1057
1058void MCAsmStreamer::EmitCFIWindowSave() {
1059  MCStreamer::EmitCFIWindowSave();
1060  OS << "\t.cfi_window_save";
1061  EmitEOL();
1062}
1063
1064void MCAsmStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
1065  MCStreamer::EmitWin64EHStartProc(Symbol);
1066
1067  OS << ".seh_proc " << *Symbol;
1068  EmitEOL();
1069}
1070
1071void MCAsmStreamer::EmitWin64EHEndProc() {
1072  MCStreamer::EmitWin64EHEndProc();
1073
1074  OS << "\t.seh_endproc";
1075  EmitEOL();
1076}
1077
1078void MCAsmStreamer::EmitWin64EHStartChained() {
1079  MCStreamer::EmitWin64EHStartChained();
1080
1081  OS << "\t.seh_startchained";
1082  EmitEOL();
1083}
1084
1085void MCAsmStreamer::EmitWin64EHEndChained() {
1086  MCStreamer::EmitWin64EHEndChained();
1087
1088  OS << "\t.seh_endchained";
1089  EmitEOL();
1090}
1091
1092void MCAsmStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
1093                                       bool Except) {
1094  MCStreamer::EmitWin64EHHandler(Sym, Unwind, Except);
1095
1096  OS << "\t.seh_handler " << *Sym;
1097  if (Unwind)
1098    OS << ", @unwind";
1099  if (Except)
1100    OS << ", @except";
1101  EmitEOL();
1102}
1103
1104static const MCSection *getWin64EHTableSection(StringRef suffix,
1105                                               MCContext &context) {
1106  // FIXME: This doesn't belong in MCObjectFileInfo. However,
1107  /// this duplicate code in MCWin64EH.cpp.
1108  if (suffix == "")
1109    return context.getObjectFileInfo()->getXDataSection();
1110  return context.getCOFFSection((".xdata"+suffix).str(),
1111                                COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
1112                                COFF::IMAGE_SCN_MEM_READ |
1113                                COFF::IMAGE_SCN_MEM_WRITE,
1114                                SectionKind::getDataRel());
1115}
1116
1117void MCAsmStreamer::EmitWin64EHHandlerData() {
1118  MCStreamer::EmitWin64EHHandlerData();
1119
1120  // Switch sections. Don't call SwitchSection directly, because that will
1121  // cause the section switch to be visible in the emitted assembly.
1122  // We only do this so the section switch that terminates the handler
1123  // data block is visible.
1124  MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
1125  StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
1126  const MCSection *xdataSect = getWin64EHTableSection(suffix, getContext());
1127  if (xdataSect)
1128    SwitchSectionNoChange(xdataSect);
1129
1130  OS << "\t.seh_handlerdata";
1131  EmitEOL();
1132}
1133
1134void MCAsmStreamer::EmitWin64EHPushReg(unsigned Register) {
1135  MCStreamer::EmitWin64EHPushReg(Register);
1136
1137  OS << "\t.seh_pushreg ";
1138  EmitRegisterName(Register);
1139  EmitEOL();
1140}
1141
1142void MCAsmStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
1143  MCStreamer::EmitWin64EHSetFrame(Register, Offset);
1144
1145  OS << "\t.seh_setframe ";
1146  EmitRegisterName(Register);
1147  OS << ", " << Offset;
1148  EmitEOL();
1149}
1150
1151void MCAsmStreamer::EmitWin64EHAllocStack(unsigned Size) {
1152  MCStreamer::EmitWin64EHAllocStack(Size);
1153
1154  OS << "\t.seh_stackalloc " << Size;
1155  EmitEOL();
1156}
1157
1158void MCAsmStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
1159  MCStreamer::EmitWin64EHSaveReg(Register, Offset);
1160
1161  OS << "\t.seh_savereg ";
1162  EmitRegisterName(Register);
1163  OS << ", " << Offset;
1164  EmitEOL();
1165}
1166
1167void MCAsmStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
1168  MCStreamer::EmitWin64EHSaveXMM(Register, Offset);
1169
1170  OS << "\t.seh_savexmm ";
1171  EmitRegisterName(Register);
1172  OS << ", " << Offset;
1173  EmitEOL();
1174}
1175
1176void MCAsmStreamer::EmitWin64EHPushFrame(bool Code) {
1177  MCStreamer::EmitWin64EHPushFrame(Code);
1178
1179  OS << "\t.seh_pushframe";
1180  if (Code)
1181    OS << " @code";
1182  EmitEOL();
1183}
1184
1185void MCAsmStreamer::EmitWin64EHEndProlog(void) {
1186  MCStreamer::EmitWin64EHEndProlog();
1187
1188  OS << "\t.seh_endprologue";
1189  EmitEOL();
1190}
1191
1192void MCAsmStreamer::AddEncodingComment(const MCInst &Inst,
1193                                       const MCSubtargetInfo &STI) {
1194  raw_ostream &OS = GetCommentOS();
1195  SmallString<256> Code;
1196  SmallVector<MCFixup, 4> Fixups;
1197  raw_svector_ostream VecOS(Code);
1198  Emitter->EncodeInstruction(Inst, VecOS, Fixups, STI);
1199  VecOS.flush();
1200
1201  // If we are showing fixups, create symbolic markers in the encoded
1202  // representation. We do this by making a per-bit map to the fixup item index,
1203  // then trying to display it as nicely as possible.
1204  SmallVector<uint8_t, 64> FixupMap;
1205  FixupMap.resize(Code.size() * 8);
1206  for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1207    FixupMap[i] = 0;
1208
1209  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1210    MCFixup &F = Fixups[i];
1211    const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1212    for (unsigned j = 0; j != Info.TargetSize; ++j) {
1213      unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1214      assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1215      FixupMap[Index] = 1 + i;
1216    }
1217  }
1218
1219  // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1220  // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1221  OS << "encoding: [";
1222  for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1223    if (i)
1224      OS << ',';
1225
1226    // See if all bits are the same map entry.
1227    uint8_t MapEntry = FixupMap[i * 8 + 0];
1228    for (unsigned j = 1; j != 8; ++j) {
1229      if (FixupMap[i * 8 + j] == MapEntry)
1230        continue;
1231
1232      MapEntry = uint8_t(~0U);
1233      break;
1234    }
1235
1236    if (MapEntry != uint8_t(~0U)) {
1237      if (MapEntry == 0) {
1238        OS << format("0x%02x", uint8_t(Code[i]));
1239      } else {
1240        if (Code[i]) {
1241          // FIXME: Some of the 8 bits require fix up.
1242          OS << format("0x%02x", uint8_t(Code[i])) << '\''
1243             << char('A' + MapEntry - 1) << '\'';
1244        } else
1245          OS << char('A' + MapEntry - 1);
1246      }
1247    } else {
1248      // Otherwise, write out in binary.
1249      OS << "0b";
1250      for (unsigned j = 8; j--;) {
1251        unsigned Bit = (Code[i] >> j) & 1;
1252
1253        unsigned FixupBit;
1254        if (MAI->isLittleEndian())
1255          FixupBit = i * 8 + j;
1256        else
1257          FixupBit = i * 8 + (7-j);
1258
1259        if (uint8_t MapEntry = FixupMap[FixupBit]) {
1260          assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1261          OS << char('A' + MapEntry - 1);
1262        } else
1263          OS << Bit;
1264      }
1265    }
1266  }
1267  OS << "]\n";
1268
1269  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1270    MCFixup &F = Fixups[i];
1271    const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1272    OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1273       << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1274  }
1275}
1276
1277void MCAsmStreamer::EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) {
1278  assert(getCurrentSection().first &&
1279         "Cannot emit contents before setting section!");
1280
1281  // Show the encoding in a comment if we have a code emitter.
1282  if (Emitter)
1283    AddEncodingComment(Inst, STI);
1284
1285  // Show the MCInst if enabled.
1286  if (ShowInst) {
1287    Inst.dump_pretty(GetCommentOS(), MAI, InstPrinter.get(), "\n ");
1288    GetCommentOS() << "\n";
1289  }
1290
1291  // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
1292  if (InstPrinter)
1293    InstPrinter->printInst(&Inst, OS, "");
1294  else
1295    Inst.print(OS, MAI);
1296  EmitEOL();
1297}
1298
1299void MCAsmStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
1300  OS << "\t.bundle_align_mode " << AlignPow2;
1301  EmitEOL();
1302}
1303
1304void MCAsmStreamer::EmitBundleLock(bool AlignToEnd) {
1305  OS << "\t.bundle_lock";
1306  if (AlignToEnd)
1307    OS << " align_to_end";
1308  EmitEOL();
1309}
1310
1311void MCAsmStreamer::EmitBundleUnlock() {
1312  OS << "\t.bundle_unlock";
1313  EmitEOL();
1314}
1315
1316/// EmitRawText - If this file is backed by an assembly streamer, this dumps
1317/// the specified string in the output .s file.  This capability is
1318/// indicated by the hasRawTextSupport() predicate.
1319void MCAsmStreamer::EmitRawTextImpl(StringRef String) {
1320  if (!String.empty() && String.back() == '\n')
1321    String = String.substr(0, String.size()-1);
1322  OS << String;
1323  EmitEOL();
1324}
1325
1326void MCAsmStreamer::FinishImpl() {
1327  // If we are generating dwarf for assembly source files dump out the sections.
1328  if (getContext().getGenDwarfForAssembly())
1329    MCGenDwarfInfo::Emit(this);
1330
1331  // Emit the label for the line table, if requested - since the rest of the
1332  // line table will be defined by .loc/.file directives, and not emitted
1333  // directly, the label is the only work required here.
1334  auto &Tables = getContext().getMCDwarfLineTables();
1335  if (!Tables.empty()) {
1336    assert(Tables.size() == 1 && "asm output only supports one line table");
1337    if (auto *Label = Tables.begin()->second.getLabel()) {
1338      SwitchSection(getContext().getObjectFileInfo()->getDwarfLineSection());
1339      EmitLabel(Label);
1340    }
1341  }
1342}
1343
1344MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1345                                    formatted_raw_ostream &OS,
1346                                    bool isVerboseAsm, bool useDwarfDirectory,
1347                                    MCInstPrinter *IP, MCCodeEmitter *CE,
1348                                    MCAsmBackend *MAB, bool ShowInst) {
1349  return new MCAsmStreamer(Context, OS, isVerboseAsm, useDwarfDirectory, IP, CE,
1350                           MAB, ShowInst);
1351}
1352