MCAsmStreamer.cpp revision cd81d94322a39503e4a3e87b6ee03d4fcb3465fb 
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
124  void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
125  void EmitLinkerOptions(ArrayRef<std::string> Options) override;
126  void EmitDataRegion(MCDataRegionType Kind) override;
127  void EmitVersionMin(MCVersionMinType Kind, unsigned Major, unsigned Minor,
128                      unsigned Update) override;
129  void EmitThumbFunc(MCSymbol *Func) override;
130
131  void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
132  void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
133  bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
134
135  void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
136  void BeginCOFFSymbolDef(const MCSymbol *Symbol) override;
137  void EmitCOFFSymbolStorageClass(int StorageClass) override;
138  void EmitCOFFSymbolType(int Type) override;
139  void EndCOFFSymbolDef() override;
140  void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
141  void EmitCOFFSecRel32(MCSymbol const *Symbol) override;
142  void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
143  void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
144                        unsigned ByteAlignment) override;
145
146  /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
147  ///
148  /// @param Symbol - The common symbol to emit.
149  /// @param Size - The size of the common symbol.
150  /// @param ByteAlignment - The alignment of the common symbol in bytes.
151  void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
152                             unsigned ByteAlignment) override;
153
154  void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = nullptr,
155                    uint64_t Size = 0, unsigned ByteAlignment = 0) override;
156
157  void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
158                       uint64_t Size, unsigned ByteAlignment = 0) override;
159
160  void EmitBytes(StringRef Data) override;
161
162  void EmitValueImpl(const MCExpr *Value, unsigned Size,
163                     const SMLoc &Loc = SMLoc()) override;
164  void EmitIntValue(uint64_t Value, unsigned Size) override;
165
166  void EmitULEB128Value(const MCExpr *Value) override;
167
168  void EmitSLEB128Value(const MCExpr *Value) override;
169
170  void EmitGPRel64Value(const MCExpr *Value) override;
171
172  void EmitGPRel32Value(const MCExpr *Value) override;
173
174
175  void EmitFill(uint64_t NumBytes, uint8_t FillValue) override;
176
177  void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
178                            unsigned ValueSize = 1,
179                            unsigned MaxBytesToEmit = 0) override;
180
181  void EmitCodeAlignment(unsigned ByteAlignment,
182                         unsigned MaxBytesToEmit = 0) override;
183
184  bool EmitValueToOffset(const MCExpr *Offset,
185                         unsigned char Value = 0) override;
186
187  void EmitFileDirective(StringRef Filename) override;
188  unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
189                                  StringRef Filename,
190                                  unsigned CUID = 0) override;
191  void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
192                             unsigned Column, unsigned Flags,
193                             unsigned Isa, unsigned Discriminator,
194                             StringRef FileName) override;
195  MCSymbol *getDwarfLineTableSymbol(unsigned CUID) override;
196
197  void EmitIdent(StringRef IdentString) override;
198  void EmitCFISections(bool EH, bool Debug) override;
199  void EmitCFIDefCfa(int64_t Register, int64_t Offset) override;
200  void EmitCFIDefCfaOffset(int64_t Offset) override;
201  void EmitCFIDefCfaRegister(int64_t Register) override;
202  void EmitCFIOffset(int64_t Register, int64_t Offset) override;
203  void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding) override;
204  void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) override;
205  void EmitCFIRememberState() override;
206  void EmitCFIRestoreState() override;
207  void EmitCFISameValue(int64_t Register) override;
208  void EmitCFIRelOffset(int64_t Register, int64_t Offset) override;
209  void EmitCFIAdjustCfaOffset(int64_t Adjustment) override;
210  void EmitCFISignalFrame() override;
211  void EmitCFIUndefined(int64_t Register) override;
212  void EmitCFIRegister(int64_t Register1, int64_t Register2) override;
213  void EmitCFIWindowSave() override;
214
215  void EmitWinCFIStartProc(const MCSymbol *Symbol) override;
216  void EmitWinCFIEndProc() override;
217  void EmitWinCFIStartChained() override;
218  void EmitWinCFIEndChained() override;
219  void EmitWinCFIPushReg(unsigned Register) override;
220  void EmitWinCFISetFrame(unsigned Register, unsigned Offset) override;
221  void EmitWinCFIAllocStack(unsigned Size) override;
222  void EmitWinCFISaveReg(unsigned Register, unsigned Offset) override;
223  void EmitWinCFISaveXMM(unsigned Register, unsigned Offset) override;
224  void EmitWinCFIPushFrame(bool Code) override;
225  void EmitWinCFIEndProlog() override;
226
227  void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except) override;
228  void EmitWinEHHandlerData() override;
229
230  void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
231
232  void EmitBundleAlignMode(unsigned AlignPow2) override;
233  void EmitBundleLock(bool AlignToEnd) override;
234  void EmitBundleUnlock() override;
235
236  /// EmitRawText - If this file is backed by an assembly streamer, this dumps
237  /// the specified string in the output .s file.  This capability is
238  /// indicated by the hasRawTextSupport() predicate.
239  void EmitRawTextImpl(StringRef String) override;
240
241  void FinishImpl() override;
242};
243
244} // end anonymous namespace.
245
246/// AddComment - Add a comment that can be emitted to the generated .s
247/// file if applicable as a QoI issue to make the output of the compiler
248/// more readable.  This only affects the MCAsmStreamer, and only when
249/// verbose assembly output is enabled.
250void MCAsmStreamer::AddComment(const Twine &T) {
251  if (!IsVerboseAsm) return;
252
253  // Make sure that CommentStream is flushed.
254  CommentStream.flush();
255
256  T.toVector(CommentToEmit);
257  // Each comment goes on its own line.
258  CommentToEmit.push_back('\n');
259
260  // Tell the comment stream that the vector changed underneath it.
261  CommentStream.resync();
262}
263
264void MCAsmStreamer::EmitCommentsAndEOL() {
265  if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
266    OS << '\n';
267    return;
268  }
269
270  CommentStream.flush();
271  StringRef Comments = CommentToEmit.str();
272
273  assert(Comments.back() == '\n' &&
274         "Comment array not newline terminated");
275  do {
276    // Emit a line of comments.
277    OS.PadToColumn(MAI->getCommentColumn());
278    size_t Position = Comments.find('\n');
279    OS << MAI->getCommentString() << ' ' << Comments.substr(0, Position) <<'\n';
280
281    Comments = Comments.substr(Position+1);
282  } while (!Comments.empty());
283
284  CommentToEmit.clear();
285  // Tell the comment stream that the vector changed underneath it.
286  CommentStream.resync();
287}
288
289static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
290  assert(Bytes && "Invalid size!");
291  return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
292}
293
294void MCAsmStreamer::emitRawComment(const Twine &T, bool TabPrefix) {
295  if (TabPrefix)
296    OS << '\t';
297  OS << MAI->getCommentString() << T;
298  EmitEOL();
299}
300
301void MCAsmStreamer::ChangeSection(const MCSection *Section,
302                                  const MCExpr *Subsection) {
303  assert(Section && "Cannot switch to a null section!");
304  Section->PrintSwitchToSection(*MAI, OS, Subsection);
305}
306
307void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
308  assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
309  MCStreamer::EmitLabel(Symbol);
310
311  OS << *Symbol << MAI->getLabelSuffix();
312  EmitEOL();
313}
314
315void MCAsmStreamer::EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {
316  StringRef str = MCLOHIdToName(Kind);
317
318#ifndef NDEBUG
319  int NbArgs = MCLOHIdToNbArgs(Kind);
320  assert(NbArgs != -1 && ((size_t)NbArgs) == Args.size() && "Malformed LOH!");
321  assert(str != "" && "Invalid LOH name");
322#endif
323
324  OS << "\t" << MCLOHDirectiveName() << " " << str << "\t";
325  bool IsFirst = true;
326  for (MCLOHArgs::const_iterator It = Args.begin(), EndIt = Args.end();
327       It != EndIt; ++It) {
328    if (!IsFirst)
329      OS << ", ";
330    IsFirst = false;
331    OS << **It;
332  }
333  EmitEOL();
334}
335
336void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
337  switch (Flag) {
338  case MCAF_SyntaxUnified:         OS << "\t.syntax unified"; break;
339  case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
340  case MCAF_Code16:                OS << '\t'<< MAI->getCode16Directive();break;
341  case MCAF_Code32:                OS << '\t'<< MAI->getCode32Directive();break;
342  case MCAF_Code64:                OS << '\t'<< MAI->getCode64Directive();break;
343  }
344  EmitEOL();
345}
346
347void MCAsmStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
348  assert(!Options.empty() && "At least one option is required!");
349  OS << "\t.linker_option \"" << Options[0] << '"';
350  for (ArrayRef<std::string>::iterator it = Options.begin() + 1,
351         ie = Options.end(); it != ie; ++it) {
352    OS << ", " << '"' << *it << '"';
353  }
354  OS << "\n";
355}
356
357void MCAsmStreamer::EmitDataRegion(MCDataRegionType Kind) {
358  if (!MAI->doesSupportDataRegionDirectives())
359    return;
360  switch (Kind) {
361  case MCDR_DataRegion:            OS << "\t.data_region"; break;
362  case MCDR_DataRegionJT8:         OS << "\t.data_region jt8"; break;
363  case MCDR_DataRegionJT16:        OS << "\t.data_region jt16"; break;
364  case MCDR_DataRegionJT32:        OS << "\t.data_region jt32"; break;
365  case MCDR_DataRegionEnd:         OS << "\t.end_data_region"; break;
366  }
367  EmitEOL();
368}
369
370void MCAsmStreamer::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
371                                   unsigned Minor, unsigned Update) {
372  switch (Kind) {
373  case MCVM_IOSVersionMin:        OS << "\t.ios_version_min"; break;
374  case MCVM_OSXVersionMin:        OS << "\t.macosx_version_min"; break;
375  }
376  OS << " " << Major << ", " << Minor;
377  if (Update)
378    OS << ", " << Update;
379  EmitEOL();
380}
381
382void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
383  // This needs to emit to a temporary string to get properly quoted
384  // MCSymbols when they have spaces in them.
385  OS << "\t.thumb_func";
386  // Only Mach-O hasSubsectionsViaSymbols()
387  if (MAI->hasSubsectionsViaSymbols())
388    OS << '\t' << *Func;
389  EmitEOL();
390}
391
392void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
393  OS << *Symbol << " = " << *Value;
394  EmitEOL();
395
396  MCStreamer::EmitAssignment(Symbol, Value);
397}
398
399void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
400  OS << ".weakref " << *Alias << ", " << *Symbol;
401  EmitEOL();
402}
403
404bool MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
405                                        MCSymbolAttr Attribute) {
406  switch (Attribute) {
407  case MCSA_Invalid: llvm_unreachable("Invalid symbol attribute");
408  case MCSA_ELF_TypeFunction:    /// .type _foo, STT_FUNC  # aka @function
409  case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
410  case MCSA_ELF_TypeObject:      /// .type _foo, STT_OBJECT  # aka @object
411  case MCSA_ELF_TypeTLS:         /// .type _foo, STT_TLS     # aka @tls_object
412  case MCSA_ELF_TypeCommon:      /// .type _foo, STT_COMMON  # aka @common
413  case MCSA_ELF_TypeNoType:      /// .type _foo, STT_NOTYPE  # aka @notype
414  case MCSA_ELF_TypeGnuUniqueObject:  /// .type _foo, @gnu_unique_object
415    if (!MAI->hasDotTypeDotSizeDirective())
416      return false; // Symbol attribute not supported
417    OS << "\t.type\t" << *Symbol << ','
418       << ((MAI->getCommentString()[0] != '@') ? '@' : '%');
419    switch (Attribute) {
420    default: return false;
421    case MCSA_ELF_TypeFunction:    OS << "function"; break;
422    case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
423    case MCSA_ELF_TypeObject:      OS << "object"; break;
424    case MCSA_ELF_TypeTLS:         OS << "tls_object"; break;
425    case MCSA_ELF_TypeCommon:      OS << "common"; break;
426    case MCSA_ELF_TypeNoType:      OS << "no_type"; break;
427    case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
428    }
429    EmitEOL();
430    return true;
431  case MCSA_Global: // .globl/.global
432    OS << MAI->getGlobalDirective();
433    break;
434  case MCSA_Hidden:         OS << "\t.hidden\t";          break;
435  case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
436  case MCSA_Internal:       OS << "\t.internal\t";        break;
437  case MCSA_LazyReference:  OS << "\t.lazy_reference\t";  break;
438  case MCSA_Local:          OS << "\t.local\t";           break;
439  case MCSA_NoDeadStrip:    OS << "\t.no_dead_strip\t";   break;
440  case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
441  case MCSA_PrivateExtern:
442    OS << "\t.private_extern\t";
443    break;
444  case MCSA_Protected:      OS << "\t.protected\t";       break;
445  case MCSA_Reference:      OS << "\t.reference\t";       break;
446  case MCSA_Weak:           OS << "\t.weak\t";            break;
447  case MCSA_WeakDefinition:
448    OS << "\t.weak_definition\t";
449    break;
450      // .weak_reference
451  case MCSA_WeakReference:  OS << MAI->getWeakRefDirective(); break;
452  case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
453  }
454
455  OS << *Symbol;
456  EmitEOL();
457
458  return true;
459}
460
461void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
462  OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
463  EmitEOL();
464}
465
466void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
467  OS << "\t.def\t " << *Symbol << ';';
468  EmitEOL();
469}
470
471void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
472  OS << "\t.scl\t" << StorageClass << ';';
473  EmitEOL();
474}
475
476void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
477  OS << "\t.type\t" << Type << ';';
478  EmitEOL();
479}
480
481void MCAsmStreamer::EndCOFFSymbolDef() {
482  OS << "\t.endef";
483  EmitEOL();
484}
485
486void MCAsmStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
487  OS << "\t.secidx\t" << *Symbol;
488  EmitEOL();
489}
490
491void MCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
492  OS << "\t.secrel32\t" << *Symbol;
493  EmitEOL();
494}
495
496void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
497  assert(MAI->hasDotTypeDotSizeDirective());
498  OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
499}
500
501void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
502                                     unsigned ByteAlignment) {
503  // Common symbols do not belong to any actual section.
504  AssignSection(Symbol, nullptr);
505
506  OS << "\t.comm\t" << *Symbol << ',' << Size;
507  if (ByteAlignment != 0) {
508    if (MAI->getCOMMDirectiveAlignmentIsInBytes())
509      OS << ',' << ByteAlignment;
510    else
511      OS << ',' << Log2_32(ByteAlignment);
512  }
513  EmitEOL();
514}
515
516/// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
517///
518/// @param Symbol - The common symbol to emit.
519/// @param Size - The size of the common symbol.
520void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
521                                          unsigned ByteAlign) {
522  // Common symbols do not belong to any actual section.
523  AssignSection(Symbol, nullptr);
524
525  OS << "\t.lcomm\t" << *Symbol << ',' << Size;
526  if (ByteAlign > 1) {
527    switch (MAI->getLCOMMDirectiveAlignmentType()) {
528    case LCOMM::NoAlignment:
529      llvm_unreachable("alignment not supported on .lcomm!");
530    case LCOMM::ByteAlignment:
531      OS << ',' << ByteAlign;
532      break;
533    case LCOMM::Log2Alignment:
534      assert(isPowerOf2_32(ByteAlign) && "alignment must be a power of 2");
535      OS << ',' << Log2_32(ByteAlign);
536      break;
537    }
538  }
539  EmitEOL();
540}
541
542void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
543                                 uint64_t Size, unsigned ByteAlignment) {
544  if (Symbol)
545    AssignSection(Symbol, Section);
546
547  // Note: a .zerofill directive does not switch sections.
548  OS << ".zerofill ";
549
550  // This is a mach-o specific directive.
551  const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
552  OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
553
554  if (Symbol) {
555    OS << ',' << *Symbol << ',' << Size;
556    if (ByteAlignment != 0)
557      OS << ',' << Log2_32(ByteAlignment);
558  }
559  EmitEOL();
560}
561
562// .tbss sym, size, align
563// This depends that the symbol has already been mangled from the original,
564// e.g. _a.
565void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
566                                   uint64_t Size, unsigned ByteAlignment) {
567  AssignSection(Symbol, Section);
568
569  assert(Symbol && "Symbol shouldn't be NULL!");
570  // Instead of using the Section we'll just use the shortcut.
571  // This is a mach-o specific directive and section.
572  OS << ".tbss " << *Symbol << ", " << Size;
573
574  // Output align if we have it.  We default to 1 so don't bother printing
575  // that.
576  if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
577
578  EmitEOL();
579}
580
581static inline char toOctal(int X) { return (X&7)+'0'; }
582
583static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
584  OS << '"';
585
586  for (unsigned i = 0, e = Data.size(); i != e; ++i) {
587    unsigned char C = Data[i];
588    if (C == '"' || C == '\\') {
589      OS << '\\' << (char)C;
590      continue;
591    }
592
593    if (isprint((unsigned char)C)) {
594      OS << (char)C;
595      continue;
596    }
597
598    switch (C) {
599      case '\b': OS << "\\b"; break;
600      case '\f': OS << "\\f"; break;
601      case '\n': OS << "\\n"; break;
602      case '\r': OS << "\\r"; break;
603      case '\t': OS << "\\t"; break;
604      default:
605        OS << '\\';
606        OS << toOctal(C >> 6);
607        OS << toOctal(C >> 3);
608        OS << toOctal(C >> 0);
609        break;
610    }
611  }
612
613  OS << '"';
614}
615
616
617void MCAsmStreamer::EmitBytes(StringRef Data) {
618  assert(getCurrentSection().first &&
619         "Cannot emit contents before setting section!");
620  if (Data.empty()) return;
621
622  if (Data.size() == 1) {
623    OS << MAI->getData8bitsDirective();
624    OS << (unsigned)(unsigned char)Data[0];
625    EmitEOL();
626    return;
627  }
628
629  // If the data ends with 0 and the target supports .asciz, use it, otherwise
630  // use .ascii
631  if (MAI->getAscizDirective() && Data.back() == 0) {
632    OS << MAI->getAscizDirective();
633    Data = Data.substr(0, Data.size()-1);
634  } else {
635    OS << MAI->getAsciiDirective();
636  }
637
638  PrintQuotedString(Data, OS);
639  EmitEOL();
640}
641
642void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
643  EmitValue(MCConstantExpr::Create(Value, getContext()), Size);
644}
645
646void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
647                                  const SMLoc &Loc) {
648  assert(Size <= 8 && "Invalid size");
649  assert(getCurrentSection().first &&
650         "Cannot emit contents before setting section!");
651  const char *Directive = nullptr;
652  switch (Size) {
653  default: break;
654  case 1: Directive = MAI->getData8bitsDirective();  break;
655  case 2: Directive = MAI->getData16bitsDirective(); break;
656  case 4: Directive = MAI->getData32bitsDirective(); break;
657  case 8: Directive = MAI->getData64bitsDirective(); break;
658  }
659
660  if (!Directive) {
661    int64_t IntValue;
662    if (!Value->EvaluateAsAbsolute(IntValue))
663      report_fatal_error("Don't know how to emit this value.");
664
665    // We couldn't handle the requested integer size so we fallback by breaking
666    // the request down into several, smaller, integers.  Since sizes greater
667    // than eight are invalid and size equivalent to eight should have been
668    // handled earlier, we use four bytes as our largest piece of granularity.
669    bool IsLittleEndian = MAI->isLittleEndian();
670    for (unsigned Emitted = 0; Emitted != Size;) {
671      unsigned Remaining = Size - Emitted;
672      // The size of our partial emission must be a power of two less than
673      // eight.
674      unsigned EmissionSize = PowerOf2Floor(Remaining);
675      if (EmissionSize > 4)
676        EmissionSize = 4;
677      // Calculate the byte offset of our partial emission taking into account
678      // the endianness of the target.
679      unsigned ByteOffset =
680          IsLittleEndian ? Emitted : (Remaining - EmissionSize);
681      uint64_t ValueToEmit = IntValue >> (ByteOffset * 8);
682      // We truncate our partial emission to fit within the bounds of the
683      // emission domain.  This produces nicer output and silences potential
684      // truncation warnings when round tripping through another assembler.
685      ValueToEmit &= ~0ULL >> (64 - EmissionSize * 8);
686      EmitIntValue(ValueToEmit, EmissionSize);
687      Emitted += EmissionSize;
688    }
689    return;
690  }
691
692  assert(Directive && "Invalid size for machine code value!");
693  OS << Directive << *Value;
694  EmitEOL();
695}
696
697void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
698  int64_t IntValue;
699  if (Value->EvaluateAsAbsolute(IntValue)) {
700    EmitULEB128IntValue(IntValue);
701    return;
702  }
703  assert(MAI->hasLEB128() && "Cannot print a .uleb");
704  OS << ".uleb128 " << *Value;
705  EmitEOL();
706}
707
708void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
709  int64_t IntValue;
710  if (Value->EvaluateAsAbsolute(IntValue)) {
711    EmitSLEB128IntValue(IntValue);
712    return;
713  }
714  assert(MAI->hasLEB128() && "Cannot print a .sleb");
715  OS << ".sleb128 " << *Value;
716  EmitEOL();
717}
718
719void MCAsmStreamer::EmitGPRel64Value(const MCExpr *Value) {
720  assert(MAI->getGPRel64Directive() != nullptr);
721  OS << MAI->getGPRel64Directive() << *Value;
722  EmitEOL();
723}
724
725void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
726  assert(MAI->getGPRel32Directive() != nullptr);
727  OS << MAI->getGPRel32Directive() << *Value;
728  EmitEOL();
729}
730
731
732/// EmitFill - Emit NumBytes bytes worth of the value specified by
733/// FillValue.  This implements directives such as '.space'.
734void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
735  if (NumBytes == 0) return;
736
737  if (const char *ZeroDirective = MAI->getZeroDirective()) {
738    OS << ZeroDirective << NumBytes;
739    if (FillValue != 0)
740      OS << ',' << (int)FillValue;
741    EmitEOL();
742    return;
743  }
744
745  // Emit a byte at a time.
746  MCStreamer::EmitFill(NumBytes, FillValue);
747}
748
749void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
750                                         unsigned ValueSize,
751                                         unsigned MaxBytesToEmit) {
752  // Some assemblers don't support non-power of two alignments, so we always
753  // emit alignments as a power of two if possible.
754  if (isPowerOf2_32(ByteAlignment)) {
755    switch (ValueSize) {
756    default:
757      llvm_unreachable("Invalid size for machine code value!");
758    case 1:
759      OS << "\t.align\t";
760      break;
761    case 2:
762      OS << ".p2alignw ";
763      break;
764    case 4:
765      OS << ".p2alignl ";
766      break;
767    case 8:
768      llvm_unreachable("Unsupported alignment size!");
769    }
770
771    if (MAI->getAlignmentIsInBytes())
772      OS << ByteAlignment;
773    else
774      OS << Log2_32(ByteAlignment);
775
776    if (Value || MaxBytesToEmit) {
777      OS << ", 0x";
778      OS.write_hex(truncateToSize(Value, ValueSize));
779
780      if (MaxBytesToEmit)
781        OS << ", " << MaxBytesToEmit;
782    }
783    EmitEOL();
784    return;
785  }
786
787  // Non-power of two alignment.  This is not widely supported by assemblers.
788  // FIXME: Parameterize this based on MAI.
789  switch (ValueSize) {
790  default: llvm_unreachable("Invalid size for machine code value!");
791  case 1: OS << ".balign";  break;
792  case 2: OS << ".balignw"; break;
793  case 4: OS << ".balignl"; break;
794  case 8: llvm_unreachable("Unsupported alignment size!");
795  }
796
797  OS << ' ' << ByteAlignment;
798  OS << ", " << truncateToSize(Value, ValueSize);
799  if (MaxBytesToEmit)
800    OS << ", " << MaxBytesToEmit;
801  EmitEOL();
802}
803
804void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
805                                      unsigned MaxBytesToEmit) {
806  // Emit with a text fill value.
807  EmitValueToAlignment(ByteAlignment, MAI->getTextAlignFillValue(),
808                       1, MaxBytesToEmit);
809}
810
811bool MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
812                                      unsigned char Value) {
813  // FIXME: Verify that Offset is associated with the current section.
814  OS << ".org " << *Offset << ", " << (unsigned) Value;
815  EmitEOL();
816  return false;
817}
818
819
820void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
821  assert(MAI->hasSingleParameterDotFile());
822  OS << "\t.file\t";
823  PrintQuotedString(Filename, OS);
824  EmitEOL();
825}
826
827unsigned MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo,
828                                               StringRef Directory,
829                                               StringRef Filename,
830                                               unsigned CUID) {
831  assert(CUID == 0);
832
833  MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
834  unsigned NumFiles = Table.getMCDwarfFiles().size();
835  FileNo = Table.getFile(Directory, Filename, FileNo);
836  if (FileNo == 0)
837    return 0;
838  if (NumFiles == Table.getMCDwarfFiles().size())
839    return FileNo;
840
841  SmallString<128> FullPathName;
842
843  if (!UseDwarfDirectory && !Directory.empty()) {
844    if (sys::path::is_absolute(Filename))
845      Directory = "";
846    else {
847      FullPathName = Directory;
848      sys::path::append(FullPathName, Filename);
849      Directory = "";
850      Filename = FullPathName;
851    }
852  }
853
854  OS << "\t.file\t" << FileNo << ' ';
855  if (!Directory.empty()) {
856    PrintQuotedString(Directory, OS);
857    OS << ' ';
858  }
859  PrintQuotedString(Filename, OS);
860  EmitEOL();
861
862  return FileNo;
863}
864
865void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
866                                          unsigned Column, unsigned Flags,
867                                          unsigned Isa,
868                                          unsigned Discriminator,
869                                          StringRef FileName) {
870  this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
871                                          Isa, Discriminator, FileName);
872  OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
873  if (Flags & DWARF2_FLAG_BASIC_BLOCK)
874    OS << " basic_block";
875  if (Flags & DWARF2_FLAG_PROLOGUE_END)
876    OS << " prologue_end";
877  if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
878    OS << " epilogue_begin";
879
880  unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
881  if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
882    OS << " is_stmt ";
883
884    if (Flags & DWARF2_FLAG_IS_STMT)
885      OS << "1";
886    else
887      OS << "0";
888  }
889
890  if (Isa)
891    OS << " isa " << Isa;
892  if (Discriminator)
893    OS << " discriminator " << Discriminator;
894
895  if (IsVerboseAsm) {
896    OS.PadToColumn(MAI->getCommentColumn());
897    OS << MAI->getCommentString() << ' ' << FileName << ':'
898       << Line << ':' << Column;
899  }
900  EmitEOL();
901}
902
903MCSymbol *MCAsmStreamer::getDwarfLineTableSymbol(unsigned CUID) {
904  // Always use the zeroth line table, since asm syntax only supports one line
905  // table for now.
906  return MCStreamer::getDwarfLineTableSymbol(0);
907}
908
909void MCAsmStreamer::EmitIdent(StringRef IdentString) {
910  assert(MAI->hasIdentDirective() && ".ident directive not supported");
911  OS << "\t.ident\t";
912  PrintQuotedString(IdentString, OS);
913  EmitEOL();
914}
915
916void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
917  MCStreamer::EmitCFISections(EH, Debug);
918  OS << "\t.cfi_sections ";
919  if (EH) {
920    OS << ".eh_frame";
921    if (Debug)
922      OS << ", .debug_frame";
923  } else if (Debug) {
924    OS << ".debug_frame";
925  }
926
927  EmitEOL();
928}
929
930void MCAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
931  OS << "\t.cfi_startproc";
932  if (Frame.IsSimple)
933    OS << " simple";
934  EmitEOL();
935}
936
937void MCAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
938  MCStreamer::EmitCFIEndProcImpl(Frame);
939  OS << "\t.cfi_endproc";
940  EmitEOL();
941}
942
943void MCAsmStreamer::EmitRegisterName(int64_t Register) {
944  if (InstPrinter && !MAI->useDwarfRegNumForCFI()) {
945    const MCRegisterInfo *MRI = getContext().getRegisterInfo();
946    unsigned LLVMRegister = MRI->getLLVMRegNum(Register, true);
947    InstPrinter->printRegName(OS, LLVMRegister);
948  } else {
949    OS << Register;
950  }
951}
952
953void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
954  MCStreamer::EmitCFIDefCfa(Register, Offset);
955  OS << "\t.cfi_def_cfa ";
956  EmitRegisterName(Register);
957  OS << ", " << Offset;
958  EmitEOL();
959}
960
961void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
962  MCStreamer::EmitCFIDefCfaOffset(Offset);
963  OS << "\t.cfi_def_cfa_offset " << Offset;
964  EmitEOL();
965}
966
967void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
968  MCStreamer::EmitCFIDefCfaRegister(Register);
969  OS << "\t.cfi_def_cfa_register ";
970  EmitRegisterName(Register);
971  EmitEOL();
972}
973
974void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
975  this->MCStreamer::EmitCFIOffset(Register, Offset);
976  OS << "\t.cfi_offset ";
977  EmitRegisterName(Register);
978  OS << ", " << Offset;
979  EmitEOL();
980}
981
982void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
983                                       unsigned Encoding) {
984  MCStreamer::EmitCFIPersonality(Sym, Encoding);
985  OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
986  EmitEOL();
987}
988
989void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
990  MCStreamer::EmitCFILsda(Sym, Encoding);
991  OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
992  EmitEOL();
993}
994
995void MCAsmStreamer::EmitCFIRememberState() {
996  MCStreamer::EmitCFIRememberState();
997  OS << "\t.cfi_remember_state";
998  EmitEOL();
999}
1000
1001void MCAsmStreamer::EmitCFIRestoreState() {
1002  MCStreamer::EmitCFIRestoreState();
1003  OS << "\t.cfi_restore_state";
1004  EmitEOL();
1005}
1006
1007void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
1008  MCStreamer::EmitCFISameValue(Register);
1009  OS << "\t.cfi_same_value ";
1010  EmitRegisterName(Register);
1011  EmitEOL();
1012}
1013
1014void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
1015  MCStreamer::EmitCFIRelOffset(Register, Offset);
1016  OS << "\t.cfi_rel_offset ";
1017  EmitRegisterName(Register);
1018  OS << ", " << Offset;
1019  EmitEOL();
1020}
1021
1022void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
1023  MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
1024  OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
1025  EmitEOL();
1026}
1027
1028void MCAsmStreamer::EmitCFISignalFrame() {
1029  MCStreamer::EmitCFISignalFrame();
1030  OS << "\t.cfi_signal_frame";
1031  EmitEOL();
1032}
1033
1034void MCAsmStreamer::EmitCFIUndefined(int64_t Register) {
1035  MCStreamer::EmitCFIUndefined(Register);
1036  OS << "\t.cfi_undefined " << Register;
1037  EmitEOL();
1038}
1039
1040void MCAsmStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
1041  MCStreamer::EmitCFIRegister(Register1, Register2);
1042  OS << "\t.cfi_register " << Register1 << ", " << Register2;
1043  EmitEOL();
1044}
1045
1046void MCAsmStreamer::EmitCFIWindowSave() {
1047  MCStreamer::EmitCFIWindowSave();
1048  OS << "\t.cfi_window_save";
1049  EmitEOL();
1050}
1051
1052void MCAsmStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
1053  MCStreamer::EmitWinCFIStartProc(Symbol);
1054
1055  OS << ".seh_proc " << *Symbol;
1056  EmitEOL();
1057}
1058
1059void MCAsmStreamer::EmitWinCFIEndProc() {
1060  MCStreamer::EmitWinCFIEndProc();
1061
1062  OS << "\t.seh_endproc";
1063  EmitEOL();
1064}
1065
1066void MCAsmStreamer::EmitWinCFIStartChained() {
1067  MCStreamer::EmitWinCFIStartChained();
1068
1069  OS << "\t.seh_startchained";
1070  EmitEOL();
1071}
1072
1073void MCAsmStreamer::EmitWinCFIEndChained() {
1074  MCStreamer::EmitWinCFIEndChained();
1075
1076  OS << "\t.seh_endchained";
1077  EmitEOL();
1078}
1079
1080void MCAsmStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
1081                                      bool Except) {
1082  MCStreamer::EmitWinEHHandler(Sym, Unwind, Except);
1083
1084  OS << "\t.seh_handler " << *Sym;
1085  if (Unwind)
1086    OS << ", @unwind";
1087  if (Except)
1088    OS << ", @except";
1089  EmitEOL();
1090}
1091
1092static const MCSection *getWin64EHTableSection(StringRef suffix,
1093                                               MCContext &context) {
1094  // FIXME: This doesn't belong in MCObjectFileInfo. However,
1095  /// this duplicate code in MCWin64EH.cpp.
1096  if (suffix == "")
1097    return context.getObjectFileInfo()->getXDataSection();
1098  return context.getCOFFSection((".xdata"+suffix).str(),
1099                                COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
1100                                COFF::IMAGE_SCN_MEM_READ |
1101                                COFF::IMAGE_SCN_MEM_WRITE,
1102                                SectionKind::getDataRel());
1103}
1104
1105void MCAsmStreamer::EmitWinEHHandlerData() {
1106  MCStreamer::EmitWinEHHandlerData();
1107
1108  // Switch sections. Don't call SwitchSection directly, because that will
1109  // cause the section switch to be visible in the emitted assembly.
1110  // We only do this so the section switch that terminates the handler
1111  // data block is visible.
1112  MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
1113  StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
1114  const MCSection *xdataSect = getWin64EHTableSection(suffix, getContext());
1115  if (xdataSect)
1116    SwitchSectionNoChange(xdataSect);
1117
1118  OS << "\t.seh_handlerdata";
1119  EmitEOL();
1120}
1121
1122void MCAsmStreamer::EmitWinCFIPushReg(unsigned Register) {
1123  MCStreamer::EmitWinCFIPushReg(Register);
1124
1125  OS << "\t.seh_pushreg " << Register;
1126  EmitEOL();
1127}
1128
1129void MCAsmStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
1130  MCStreamer::EmitWinCFISetFrame(Register, Offset);
1131
1132  OS << "\t.seh_setframe " << Register << ", " << Offset;
1133  EmitEOL();
1134}
1135
1136void MCAsmStreamer::EmitWinCFIAllocStack(unsigned Size) {
1137  MCStreamer::EmitWinCFIAllocStack(Size);
1138
1139  OS << "\t.seh_stackalloc " << Size;
1140  EmitEOL();
1141}
1142
1143void MCAsmStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
1144  MCStreamer::EmitWinCFISaveReg(Register, Offset);
1145
1146  OS << "\t.seh_savereg " << Register << ", " << Offset;
1147  EmitEOL();
1148}
1149
1150void MCAsmStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
1151  MCStreamer::EmitWinCFISaveXMM(Register, Offset);
1152
1153  OS << "\t.seh_savexmm " << Register << ", " << Offset;
1154  EmitEOL();
1155}
1156
1157void MCAsmStreamer::EmitWinCFIPushFrame(bool Code) {
1158  MCStreamer::EmitWinCFIPushFrame(Code);
1159
1160  OS << "\t.seh_pushframe";
1161  if (Code)
1162    OS << " @code";
1163  EmitEOL();
1164}
1165
1166void MCAsmStreamer::EmitWinCFIEndProlog(void) {
1167  MCStreamer::EmitWinCFIEndProlog();
1168
1169  OS << "\t.seh_endprologue";
1170  EmitEOL();
1171}
1172
1173void MCAsmStreamer::AddEncodingComment(const MCInst &Inst,
1174                                       const MCSubtargetInfo &STI) {
1175  raw_ostream &OS = GetCommentOS();
1176  SmallString<256> Code;
1177  SmallVector<MCFixup, 4> Fixups;
1178  raw_svector_ostream VecOS(Code);
1179  Emitter->EncodeInstruction(Inst, VecOS, Fixups, STI);
1180  VecOS.flush();
1181
1182  // If we are showing fixups, create symbolic markers in the encoded
1183  // representation. We do this by making a per-bit map to the fixup item index,
1184  // then trying to display it as nicely as possible.
1185  SmallVector<uint8_t, 64> FixupMap;
1186  FixupMap.resize(Code.size() * 8);
1187  for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1188    FixupMap[i] = 0;
1189
1190  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1191    MCFixup &F = Fixups[i];
1192    const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1193    for (unsigned j = 0; j != Info.TargetSize; ++j) {
1194      unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1195      assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1196      FixupMap[Index] = 1 + i;
1197    }
1198  }
1199
1200  // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1201  // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1202  OS << "encoding: [";
1203  for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1204    if (i)
1205      OS << ',';
1206
1207    // See if all bits are the same map entry.
1208    uint8_t MapEntry = FixupMap[i * 8 + 0];
1209    for (unsigned j = 1; j != 8; ++j) {
1210      if (FixupMap[i * 8 + j] == MapEntry)
1211        continue;
1212
1213      MapEntry = uint8_t(~0U);
1214      break;
1215    }
1216
1217    if (MapEntry != uint8_t(~0U)) {
1218      if (MapEntry == 0) {
1219        OS << format("0x%02x", uint8_t(Code[i]));
1220      } else {
1221        if (Code[i]) {
1222          // FIXME: Some of the 8 bits require fix up.
1223          OS << format("0x%02x", uint8_t(Code[i])) << '\''
1224             << char('A' + MapEntry - 1) << '\'';
1225        } else
1226          OS << char('A' + MapEntry - 1);
1227      }
1228    } else {
1229      // Otherwise, write out in binary.
1230      OS << "0b";
1231      for (unsigned j = 8; j--;) {
1232        unsigned Bit = (Code[i] >> j) & 1;
1233
1234        unsigned FixupBit;
1235        if (MAI->isLittleEndian())
1236          FixupBit = i * 8 + j;
1237        else
1238          FixupBit = i * 8 + (7-j);
1239
1240        if (uint8_t MapEntry = FixupMap[FixupBit]) {
1241          assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1242          OS << char('A' + MapEntry - 1);
1243        } else
1244          OS << Bit;
1245      }
1246    }
1247  }
1248  OS << "]\n";
1249
1250  for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1251    MCFixup &F = Fixups[i];
1252    const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1253    OS << "  fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1254       << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1255  }
1256}
1257
1258void MCAsmStreamer::EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) {
1259  assert(getCurrentSection().first &&
1260         "Cannot emit contents before setting section!");
1261
1262  // Show the encoding in a comment if we have a code emitter.
1263  if (Emitter)
1264    AddEncodingComment(Inst, STI);
1265
1266  // Show the MCInst if enabled.
1267  if (ShowInst) {
1268    Inst.dump_pretty(GetCommentOS(), MAI, InstPrinter.get(), "\n ");
1269    GetCommentOS() << "\n";
1270  }
1271
1272  // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
1273  if (InstPrinter)
1274    InstPrinter->printInst(&Inst, OS, "");
1275  else
1276    Inst.print(OS, MAI);
1277  EmitEOL();
1278}
1279
1280void MCAsmStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
1281  OS << "\t.bundle_align_mode " << AlignPow2;
1282  EmitEOL();
1283}
1284
1285void MCAsmStreamer::EmitBundleLock(bool AlignToEnd) {
1286  OS << "\t.bundle_lock";
1287  if (AlignToEnd)
1288    OS << " align_to_end";
1289  EmitEOL();
1290}
1291
1292void MCAsmStreamer::EmitBundleUnlock() {
1293  OS << "\t.bundle_unlock";
1294  EmitEOL();
1295}
1296
1297/// EmitRawText - If this file is backed by an assembly streamer, this dumps
1298/// the specified string in the output .s file.  This capability is
1299/// indicated by the hasRawTextSupport() predicate.
1300void MCAsmStreamer::EmitRawTextImpl(StringRef String) {
1301  if (!String.empty() && String.back() == '\n')
1302    String = String.substr(0, String.size()-1);
1303  OS << String;
1304  EmitEOL();
1305}
1306
1307void MCAsmStreamer::FinishImpl() {
1308  // If we are generating dwarf for assembly source files dump out the sections.
1309  if (getContext().getGenDwarfForAssembly())
1310    MCGenDwarfInfo::Emit(this);
1311
1312  // Emit the label for the line table, if requested - since the rest of the
1313  // line table will be defined by .loc/.file directives, and not emitted
1314  // directly, the label is the only work required here.
1315  auto &Tables = getContext().getMCDwarfLineTables();
1316  if (!Tables.empty()) {
1317    assert(Tables.size() == 1 && "asm output only supports one line table");
1318    if (auto *Label = Tables.begin()->second.getLabel()) {
1319      SwitchSection(getContext().getObjectFileInfo()->getDwarfLineSection());
1320      EmitLabel(Label);
1321    }
1322  }
1323}
1324
1325MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1326                                    formatted_raw_ostream &OS,
1327                                    bool isVerboseAsm, bool useDwarfDirectory,
1328                                    MCInstPrinter *IP, MCCodeEmitter *CE,
1329                                    MCAsmBackend *MAB, bool ShowInst) {
1330  return new MCAsmStreamer(Context, OS, isVerboseAsm, useDwarfDirectory, IP, CE,
1331                           MAB, ShowInst);
1332}
1333