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MCStreamer.h
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1 //===- MCStreamer.h - High-level Streaming Machine Code Output --*- C++ -*-===//
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 // This file declares the MCStreamer class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_MC_MCSTREAMER_H
15 #define LLVM_MC_MCSTREAMER_H
16 
17 #include "llvm/ADT/ArrayRef.h"
18 #include "llvm/ADT/DenseMap.h"
19 #include "llvm/ADT/Optional.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/ADT/StringRef.h"
22 #include "llvm/MC/MCDirectives.h"
23 #include "llvm/MC/MCDwarf.h"
25 #include "llvm/MC/MCSymbol.h"
26 #include "llvm/MC/MCWinEH.h"
27 #include "llvm/Support/Error.h"
28 #include "llvm/Support/MD5.h"
29 #include "llvm/Support/SMLoc.h"
31 #include <cassert>
32 #include <cstdint>
33 #include <memory>
34 #include <string>
35 #include <utility>
36 #include <vector>
37 
38 namespace llvm {
39 
40 class AssemblerConstantPools;
41 class formatted_raw_ostream;
42 class MCAsmBackend;
43 class MCCodeEmitter;
44 struct MCCodePaddingContext;
45 class MCContext;
46 class MCExpr;
47 class MCInst;
48 class MCInstPrinter;
49 class MCSection;
50 class MCStreamer;
51 class MCSymbolRefExpr;
52 class MCSubtargetInfo;
53 class raw_ostream;
54 class Twine;
55 
56 using MCSectionSubPair = std::pair<MCSection *, const MCExpr *>;
57 
58 /// Target specific streamer interface. This is used so that targets can
59 /// implement support for target specific assembly directives.
60 ///
61 /// If target foo wants to use this, it should implement 3 classes:
62 /// * FooTargetStreamer : public MCTargetStreamer
63 /// * FooTargetAsmStreamer : public FooTargetStreamer
64 /// * FooTargetELFStreamer : public FooTargetStreamer
65 ///
66 /// FooTargetStreamer should have a pure virtual method for each directive. For
67 /// example, for a ".bar symbol_name" directive, it should have
68 /// virtual emitBar(const MCSymbol &Symbol) = 0;
69 ///
70 /// The FooTargetAsmStreamer and FooTargetELFStreamer classes implement the
71 /// method. The assembly streamer just prints ".bar symbol_name". The object
72 /// streamer does whatever is needed to implement .bar in the object file.
73 ///
74 /// In the assembly printer and parser the target streamer can be used by
75 /// calling getTargetStreamer and casting it to FooTargetStreamer:
76 ///
77 /// MCTargetStreamer &TS = OutStreamer.getTargetStreamer();
78 /// FooTargetStreamer &ATS = static_cast<FooTargetStreamer &>(TS);
79 ///
80 /// The base classes FooTargetAsmStreamer and FooTargetELFStreamer should
81 /// *never* be treated differently. Callers should always talk to a
82 /// FooTargetStreamer.
84 protected:
86 
87 public:
89  virtual ~MCTargetStreamer();
90 
92 
93  // Allow a target to add behavior to the EmitLabel of MCStreamer.
94  virtual void emitLabel(MCSymbol *Symbol);
95  // Allow a target to add behavior to the emitAssignment of MCStreamer.
96  virtual void emitAssignment(MCSymbol *Symbol, const MCExpr *Value);
97 
98  virtual void prettyPrintAsm(MCInstPrinter &InstPrinter, raw_ostream &OS,
99  const MCInst &Inst, const MCSubtargetInfo &STI);
100 
101  virtual void emitDwarfFileDirective(StringRef Directive);
102 
103  /// Update streamer for a new active section.
104  ///
105  /// This is called by PopSection and SwitchSection, if the current
106  /// section changes.
107  virtual void changeSection(const MCSection *CurSection, MCSection *Section,
108  const MCExpr *SubSection, raw_ostream &OS);
109 
110  virtual void emitValue(const MCExpr *Value);
111 
112  virtual void finish();
113 };
114 
115 // FIXME: declared here because it is used from
116 // lib/CodeGen/AsmPrinter/ARMException.cpp.
118 public:
120  ~ARMTargetStreamer() override;
121 
122  virtual void emitFnStart();
123  virtual void emitFnEnd();
124  virtual void emitCantUnwind();
125  virtual void emitPersonality(const MCSymbol *Personality);
126  virtual void emitPersonalityIndex(unsigned Index);
127  virtual void emitHandlerData();
128  virtual void emitSetFP(unsigned FpReg, unsigned SpReg,
129  int64_t Offset = 0);
130  virtual void emitMovSP(unsigned Reg, int64_t Offset = 0);
131  virtual void emitPad(int64_t Offset);
132  virtual void emitRegSave(const SmallVectorImpl<unsigned> &RegList,
133  bool isVector);
134  virtual void emitUnwindRaw(int64_t StackOffset,
135  const SmallVectorImpl<uint8_t> &Opcodes);
136 
137  virtual void switchVendor(StringRef Vendor);
138  virtual void emitAttribute(unsigned Attribute, unsigned Value);
139  virtual void emitTextAttribute(unsigned Attribute, StringRef String);
140  virtual void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
141  StringRef StringValue = "");
142  virtual void emitFPU(unsigned FPU);
143  virtual void emitArch(ARM::ArchKind Arch);
144  virtual void emitArchExtension(unsigned ArchExt);
145  virtual void emitObjectArch(ARM::ArchKind Arch);
146  void emitTargetAttributes(const MCSubtargetInfo &STI);
147  virtual void finishAttributeSection();
148  virtual void emitInst(uint32_t Inst, char Suffix = '\0');
149 
150  virtual void AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *SRE);
151 
152  virtual void emitThumbSet(MCSymbol *Symbol, const MCExpr *Value);
153 
154  void finish() override;
155 
156  /// Reset any state between object emissions, i.e. the equivalent of
157  /// MCStreamer's reset method.
158  virtual void reset();
159 
160  /// Callback used to implement the ldr= pseudo.
161  /// Add a new entry to the constant pool for the current section and return an
162  /// MCExpr that can be used to refer to the constant pool location.
163  const MCExpr *addConstantPoolEntry(const MCExpr *, SMLoc Loc);
164 
165  /// Callback used to implemnt the .ltorg directive.
166  /// Emit contents of constant pool for the current section.
167  void emitCurrentConstantPool();
168 
169 private:
170  std::unique_ptr<AssemblerConstantPools> ConstantPools;
171 };
172 
173 /// Streaming machine code generation interface.
174 ///
175 /// This interface is intended to provide a programatic interface that is very
176 /// similar to the level that an assembler .s file provides. It has callbacks
177 /// to emit bytes, handle directives, etc. The implementation of this interface
178 /// retains state to know what the current section is etc.
179 ///
180 /// There are multiple implementations of this interface: one for writing out
181 /// a .s file, and implementations that write out .o files of various formats.
182 ///
183 class MCStreamer {
185  std::unique_ptr<MCTargetStreamer> TargetStreamer;
186 
187  std::vector<MCDwarfFrameInfo> DwarfFrameInfos;
188  MCDwarfFrameInfo *getCurrentDwarfFrameInfo();
189 
190  /// Similar to DwarfFrameInfos, but for SEH unwind info. Chained frames may
191  /// refer to each other, so use std::unique_ptr to provide pointer stability.
192  std::vector<std::unique_ptr<WinEH::FrameInfo>> WinFrameInfos;
193 
194  WinEH::FrameInfo *CurrentWinFrameInfo;
195 
196  /// Retreive the current frame info if one is available and it is not yet
197  /// closed. Otherwise, issue an error and return null.
198  WinEH::FrameInfo *EnsureValidWinFrameInfo(SMLoc Loc);
199 
200  /// Tracks an index to represent the order a symbol was emitted in.
201  /// Zero means we did not emit that symbol.
203 
204  /// This is stack of current and previous section values saved by
205  /// PushSection.
207 
208  /// The next unique ID to use when creating a WinCFI-related section (.pdata
209  /// or .xdata). This ID ensures that we have a one-to-one mapping from
210  /// code section to unwind info section, which MSVC's incremental linker
211  /// requires.
212  unsigned NextWinCFIID = 0;
213 
214  bool UseAssemblerInfoForParsing;
215 
216 protected:
217  MCStreamer(MCContext &Ctx);
218 
219  virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
220  virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &CurFrame);
221 
222  /// When emitting an object file, create and emit a real label. When emitting
223  /// textual assembly, this should do nothing to avoid polluting our output.
224  virtual MCSymbol *EmitCFILabel();
225 
227  return CurrentWinFrameInfo;
228  }
229 
230  virtual void EmitWindowsUnwindTables();
231 
232  virtual void EmitRawTextImpl(StringRef String);
233 
234  /// Returns true if the the .cv_loc directive is in the right section.
235  bool checkCVLocSection(unsigned FuncId, unsigned FileNo, SMLoc Loc);
236 
237 public:
238  MCStreamer(const MCStreamer &) = delete;
239  MCStreamer &operator=(const MCStreamer &) = delete;
240  virtual ~MCStreamer();
241 
242  void visitUsedExpr(const MCExpr &Expr);
243  virtual void visitUsedSymbol(const MCSymbol &Sym);
244 
246  TargetStreamer.reset(TS);
247  }
248 
249  /// State management
250  ///
251  virtual void reset();
252 
253  MCContext &getContext() const { return Context; }
254 
255  virtual MCAssembler *getAssemblerPtr() { return nullptr; }
256 
257  void setUseAssemblerInfoForParsing(bool v) { UseAssemblerInfoForParsing = v; }
258  bool getUseAssemblerInfoForParsing() { return UseAssemblerInfoForParsing; }
259 
261  return TargetStreamer.get();
262  }
263 
264  unsigned getNumFrameInfos() { return DwarfFrameInfos.size(); }
266  return DwarfFrameInfos;
267  }
268 
269  bool hasUnfinishedDwarfFrameInfo();
270 
271  unsigned getNumWinFrameInfos() { return WinFrameInfos.size(); }
273  return WinFrameInfos;
274  }
275 
276  void generateCompactUnwindEncodings(MCAsmBackend *MAB);
277 
278  /// \name Assembly File Formatting.
279  /// @{
280 
281  /// Return true if this streamer supports verbose assembly and if it is
282  /// enabled.
283  virtual bool isVerboseAsm() const { return false; }
284 
285  /// Return true if this asm streamer supports emitting unformatted text
286  /// to the .s file with EmitRawText.
287  virtual bool hasRawTextSupport() const { return false; }
288 
289  /// Is the integrated assembler required for this streamer to function
290  /// correctly?
291  virtual bool isIntegratedAssemblerRequired() const { return false; }
292 
293  /// Add a textual comment.
294  ///
295  /// Typically for comments that can be emitted to the generated .s
296  /// file if applicable as a QoI issue to make the output of the compiler
297  /// more readable. This only affects the MCAsmStreamer, and only when
298  /// verbose assembly output is enabled.
299  ///
300  /// If the comment includes embedded \n's, they will each get the comment
301  /// prefix as appropriate. The added comment should not end with a \n.
302  /// By default, each comment is terminated with an end of line, i.e. the
303  /// EOL param is set to true by default. If one prefers not to end the
304  /// comment with a new line then the EOL param should be passed
305  /// with a false value.
306  virtual void AddComment(const Twine &T, bool EOL = true) {}
307 
308  /// Return a raw_ostream that comments can be written to. Unlike
309  /// AddComment, you are required to terminate comments with \n if you use this
310  /// method.
311  virtual raw_ostream &GetCommentOS();
312 
313  /// Print T and prefix it with the comment string (normally #) and
314  /// optionally a tab. This prints the comment immediately, not at the end of
315  /// the current line. It is basically a safe version of EmitRawText: since it
316  /// only prints comments, the object streamer ignores it instead of asserting.
317  virtual void emitRawComment(const Twine &T, bool TabPrefix = true);
318 
319  /// Add explicit comment T. T is required to be a valid
320  /// comment in the output and does not need to be escaped.
321  virtual void addExplicitComment(const Twine &T);
322 
323  /// Emit added explicit comments.
324  virtual void emitExplicitComments();
325 
326  /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
327  virtual void AddBlankLine() {}
328 
329  /// @}
330 
331  /// \name Symbol & Section Management
332  /// @{
333 
334  /// Return the current section that the streamer is emitting code to.
336  if (!SectionStack.empty())
337  return SectionStack.back().first;
338  return MCSectionSubPair();
339  }
340  MCSection *getCurrentSectionOnly() const { return getCurrentSection().first; }
341 
342  /// Return the previous section that the streamer is emitting code to.
344  if (!SectionStack.empty())
345  return SectionStack.back().second;
346  return MCSectionSubPair();
347  }
348 
349  /// Returns an index to represent the order a symbol was emitted in.
350  /// (zero if we did not emit that symbol)
351  unsigned GetSymbolOrder(const MCSymbol *Sym) const {
352  return SymbolOrdering.lookup(Sym);
353  }
354 
355  /// Update streamer for a new active section.
356  ///
357  /// This is called by PopSection and SwitchSection, if the current
358  /// section changes.
359  virtual void ChangeSection(MCSection *, const MCExpr *);
360 
361  /// Save the current and previous section on the section stack.
362  void PushSection() {
363  SectionStack.push_back(
364  std::make_pair(getCurrentSection(), getPreviousSection()));
365  }
366 
367  /// Restore the current and previous section from the section stack.
368  /// Calls ChangeSection as needed.
369  ///
370  /// Returns false if the stack was empty.
371  bool PopSection() {
372  if (SectionStack.size() <= 1)
373  return false;
374  auto I = SectionStack.end();
375  --I;
376  MCSectionSubPair OldSection = I->first;
377  --I;
378  MCSectionSubPair NewSection = I->first;
379 
380  if (OldSection != NewSection)
381  ChangeSection(NewSection.first, NewSection.second);
382  SectionStack.pop_back();
383  return true;
384  }
385 
386  bool SubSection(const MCExpr *Subsection) {
387  if (SectionStack.empty())
388  return false;
389 
390  SwitchSection(SectionStack.back().first.first, Subsection);
391  return true;
392  }
393 
394  /// Set the current section where code is being emitted to \p Section. This
395  /// is required to update CurSection.
396  ///
397  /// This corresponds to assembler directives like .section, .text, etc.
398  virtual void SwitchSection(MCSection *Section,
399  const MCExpr *Subsection = nullptr);
400 
401  /// Set the current section where code is being emitted to \p Section.
402  /// This is required to update CurSection. This version does not call
403  /// ChangeSection.
405  const MCExpr *Subsection = nullptr) {
406  assert(Section && "Cannot switch to a null section!");
407  MCSectionSubPair curSection = SectionStack.back().first;
408  SectionStack.back().second = curSection;
409  if (MCSectionSubPair(Section, Subsection) != curSection)
410  SectionStack.back().first = MCSectionSubPair(Section, Subsection);
411  }
412 
413  /// Create the default sections and set the initial one.
414  virtual void InitSections(bool NoExecStack);
415 
416  MCSymbol *endSection(MCSection *Section);
417 
418  /// Sets the symbol's section.
419  ///
420  /// Each emitted symbol will be tracked in the ordering table,
421  /// so we can sort on them later.
422  void AssignFragment(MCSymbol *Symbol, MCFragment *Fragment);
423 
424  /// Emit a label for \p Symbol into the current section.
425  ///
426  /// This corresponds to an assembler statement such as:
427  /// foo:
428  ///
429  /// \param Symbol - The symbol to emit. A given symbol should only be
430  /// emitted as a label once, and symbols emitted as a label should never be
431  /// used in an assignment.
432  // FIXME: These emission are non-const because we mutate the symbol to
433  // add the section we're emitting it to later.
434  virtual void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc());
435 
436  virtual void EmitEHSymAttributes(const MCSymbol *Symbol, MCSymbol *EHSymbol);
437 
438  /// Note in the output the specified \p Flag.
439  virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
440 
441  /// Emit the given list \p Options of strings as linker
442  /// options into the output.
444 
445  /// Note in the output the specified region \p Kind.
447 
448  /// Specify the Mach-O minimum deployment target version.
449  virtual void EmitVersionMin(MCVersionMinType Type, unsigned Major,
450  unsigned Minor, unsigned Update) {}
451 
452  /// Emit/Specify Mach-O build version command.
453  /// \p Platform should be one of MachO::PlatformType.
454  virtual void EmitBuildVersion(unsigned Platform, unsigned Major,
455  unsigned Minor, unsigned Update) {}
456 
457  void EmitVersionForTarget(const Triple &Target);
458 
459  /// Note in the output that the specified \p Func is a Thumb mode
460  /// function (ARM target only).
461  virtual void EmitThumbFunc(MCSymbol *Func);
462 
463  /// Emit an assignment of \p Value to \p Symbol.
464  ///
465  /// This corresponds to an assembler statement such as:
466  /// symbol = value
467  ///
468  /// The assignment generates no code, but has the side effect of binding the
469  /// value in the current context. For the assembly streamer, this prints the
470  /// binding into the .s file.
471  ///
472  /// \param Symbol - The symbol being assigned to.
473  /// \param Value - The value for the symbol.
474  virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
475 
476  /// Emit an weak reference from \p Alias to \p Symbol.
477  ///
478  /// This corresponds to an assembler statement such as:
479  /// .weakref alias, symbol
480  ///
481  /// \param Alias - The alias that is being created.
482  /// \param Symbol - The symbol being aliased.
483  virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
484 
485  /// Add the given \p Attribute to \p Symbol.
486  virtual bool EmitSymbolAttribute(MCSymbol *Symbol,
487  MCSymbolAttr Attribute) = 0;
488 
489  /// Set the \p DescValue for the \p Symbol.
490  ///
491  /// \param Symbol - The symbol to have its n_desc field set.
492  /// \param DescValue - The value to set into the n_desc field.
493  virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
494 
495  /// Start emitting COFF symbol definition
496  ///
497  /// \param Symbol - The symbol to have its External & Type fields set.
498  virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
499 
500  /// Emit the storage class of the symbol.
501  ///
502  /// \param StorageClass - The storage class the symbol should have.
503  virtual void EmitCOFFSymbolStorageClass(int StorageClass);
504 
505  /// Emit the type of the symbol.
506  ///
507  /// \param Type - A COFF type identifier (see COFF::SymbolType in X86COFF.h)
508  virtual void EmitCOFFSymbolType(int Type);
509 
510  /// Marks the end of the symbol definition.
511  virtual void EndCOFFSymbolDef();
512 
513  virtual void EmitCOFFSafeSEH(MCSymbol const *Symbol);
514 
515  /// Emits the symbol table index of a Symbol into the current section.
516  virtual void EmitCOFFSymbolIndex(MCSymbol const *Symbol);
517 
518  /// Emits a COFF section index.
519  ///
520  /// \param Symbol - Symbol the section number relocation should point to.
521  virtual void EmitCOFFSectionIndex(MCSymbol const *Symbol);
522 
523  /// Emits a COFF section relative relocation.
524  ///
525  /// \param Symbol - Symbol the section relative relocation should point to.
526  virtual void EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset);
527 
528  /// Emits a COFF image relative relocation.
529  ///
530  /// \param Symbol - Symbol the image relative relocation should point to.
531  virtual void EmitCOFFImgRel32(MCSymbol const *Symbol, int64_t Offset);
532 
533  /// Emit an ELF .size directive.
534  ///
535  /// This corresponds to an assembler statement such as:
536  /// .size symbol, expression
537  virtual void emitELFSize(MCSymbol *Symbol, const MCExpr *Value);
538 
539  /// Emit an ELF .symver directive.
540  ///
541  /// This corresponds to an assembler statement such as:
542  /// .symver _start, foo@@SOME_VERSION
543  /// \param AliasName - The versioned alias (i.e. "foo@@SOME_VERSION")
544  /// \param Aliasee - The aliased symbol (i.e. "_start")
545  virtual void emitELFSymverDirective(StringRef AliasName,
546  const MCSymbol *Aliasee);
547 
548  /// Emit a Linker Optimization Hint (LOH) directive.
549  /// \param Args - Arguments of the LOH.
550  virtual void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {}
551 
552  /// Emit a common symbol.
553  ///
554  /// \param Symbol - The common symbol to emit.
555  /// \param Size - The size of the common symbol.
556  /// \param ByteAlignment - The alignment of the symbol if
557  /// non-zero. This must be a power of 2.
558  virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
559  unsigned ByteAlignment) = 0;
560 
561  /// Emit a local common (.lcomm) symbol.
562  ///
563  /// \param Symbol - The common symbol to emit.
564  /// \param Size - The size of the common symbol.
565  /// \param ByteAlignment - The alignment of the common symbol in bytes.
566  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
567  unsigned ByteAlignment);
568 
569  /// Emit the zerofill section and an optional symbol.
570  ///
571  /// \param Section - The zerofill section to create and or to put the symbol
572  /// \param Symbol - The zerofill symbol to emit, if non-NULL.
573  /// \param Size - The size of the zerofill symbol.
574  /// \param ByteAlignment - The alignment of the zerofill symbol if
575  /// non-zero. This must be a power of 2 on some targets.
576  virtual void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
577  uint64_t Size = 0, unsigned ByteAlignment = 0,
578  SMLoc Loc = SMLoc()) = 0;
579 
580  /// Emit a thread local bss (.tbss) symbol.
581  ///
582  /// \param Section - The thread local common section.
583  /// \param Symbol - The thread local common symbol to emit.
584  /// \param Size - The size of the symbol.
585  /// \param ByteAlignment - The alignment of the thread local common symbol
586  /// if non-zero. This must be a power of 2 on some targets.
587  virtual void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
588  uint64_t Size, unsigned ByteAlignment = 0);
589 
590  /// @}
591  /// \name Generating Data
592  /// @{
593 
594  /// Emit the bytes in \p Data into the output.
595  ///
596  /// This is used to implement assembler directives such as .byte, .ascii,
597  /// etc.
598  virtual void EmitBytes(StringRef Data);
599 
600  /// Functionally identical to EmitBytes. When emitting textual assembly, this
601  /// method uses .byte directives instead of .ascii or .asciz for readability.
602  virtual void EmitBinaryData(StringRef Data);
603 
604  /// Emit the expression \p Value into the output as a native
605  /// integer of the given \p Size bytes.
606  ///
607  /// This is used to implement assembler directives such as .word, .quad,
608  /// etc.
609  ///
610  /// \param Value - The value to emit.
611  /// \param Size - The size of the integer (in bytes) to emit. This must
612  /// match a native machine width.
613  /// \param Loc - The location of the expression for error reporting.
614  virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
615  SMLoc Loc = SMLoc());
616 
617  void EmitValue(const MCExpr *Value, unsigned Size, SMLoc Loc = SMLoc());
618 
619  /// Special case of EmitValue that avoids the client having
620  /// to pass in a MCExpr for constant integers.
621  virtual void EmitIntValue(uint64_t Value, unsigned Size);
622 
623  virtual void EmitULEB128Value(const MCExpr *Value);
624 
625  virtual void EmitSLEB128Value(const MCExpr *Value);
626 
627  /// Special case of EmitULEB128Value that avoids the client having to
628  /// pass in a MCExpr for constant integers.
629  void EmitULEB128IntValue(uint64_t Value);
630 
631  /// Special case of EmitSLEB128Value that avoids the client having to
632  /// pass in a MCExpr for constant integers.
633  void EmitSLEB128IntValue(int64_t Value);
634 
635  /// Special case of EmitValue that avoids the client having to pass in
636  /// a MCExpr for MCSymbols.
637  void EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
638  bool IsSectionRelative = false);
639 
640  /// Emit the expression \p Value into the output as a dtprel
641  /// (64-bit DTP relative) value.
642  ///
643  /// This is used to implement assembler directives such as .dtpreldword on
644  /// targets that support them.
645  virtual void EmitDTPRel64Value(const MCExpr *Value);
646 
647  /// Emit the expression \p Value into the output as a dtprel
648  /// (32-bit DTP relative) value.
649  ///
650  /// This is used to implement assembler directives such as .dtprelword on
651  /// targets that support them.
652  virtual void EmitDTPRel32Value(const MCExpr *Value);
653 
654  /// Emit the expression \p Value into the output as a tprel
655  /// (64-bit TP relative) value.
656  ///
657  /// This is used to implement assembler directives such as .tpreldword on
658  /// targets that support them.
659  virtual void EmitTPRel64Value(const MCExpr *Value);
660 
661  /// Emit the expression \p Value into the output as a tprel
662  /// (32-bit TP relative) value.
663  ///
664  /// This is used to implement assembler directives such as .tprelword on
665  /// targets that support them.
666  virtual void EmitTPRel32Value(const MCExpr *Value);
667 
668  /// Emit the expression \p Value into the output as a gprel64 (64-bit
669  /// GP relative) value.
670  ///
671  /// This is used to implement assembler directives such as .gpdword on
672  /// targets that support them.
673  virtual void EmitGPRel64Value(const MCExpr *Value);
674 
675  /// Emit the expression \p Value into the output as a gprel32 (32-bit
676  /// GP relative) value.
677  ///
678  /// This is used to implement assembler directives such as .gprel32 on
679  /// targets that support them.
680  virtual void EmitGPRel32Value(const MCExpr *Value);
681 
682  /// Emit NumBytes bytes worth of the value specified by FillValue.
683  /// This implements directives such as '.space'.
684  void emitFill(uint64_t NumBytes, uint8_t FillValue);
685 
686  /// Emit \p Size bytes worth of the value specified by \p FillValue.
687  ///
688  /// This is used to implement assembler directives such as .space or .skip.
689  ///
690  /// \param NumBytes - The number of bytes to emit.
691  /// \param FillValue - The value to use when filling bytes.
692  /// \param Loc - The location of the expression for error reporting.
693  virtual void emitFill(const MCExpr &NumBytes, uint64_t FillValue,
694  SMLoc Loc = SMLoc());
695 
696  /// Emit \p NumValues copies of \p Size bytes. Each \p Size bytes is
697  /// taken from the lowest order 4 bytes of \p Expr expression.
698  ///
699  /// This is used to implement assembler directives such as .fill.
700  ///
701  /// \param NumValues - The number of copies of \p Size bytes to emit.
702  /// \param Size - The size (in bytes) of each repeated value.
703  /// \param Expr - The expression from which \p Size bytes are used.
704  virtual void emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
705  SMLoc Loc = SMLoc());
706 
707  /// Emit NumBytes worth of zeros.
708  /// This function properly handles data in virtual sections.
709  void EmitZeros(uint64_t NumBytes);
710 
711  /// Emit some number of copies of \p Value until the byte alignment \p
712  /// ByteAlignment is reached.
713  ///
714  /// If the number of bytes need to emit for the alignment is not a multiple
715  /// of \p ValueSize, then the contents of the emitted fill bytes is
716  /// undefined.
717  ///
718  /// This used to implement the .align assembler directive.
719  ///
720  /// \param ByteAlignment - The alignment to reach. This must be a power of
721  /// two on some targets.
722  /// \param Value - The value to use when filling bytes.
723  /// \param ValueSize - The size of the integer (in bytes) to emit for
724  /// \p Value. This must match a native machine width.
725  /// \param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
726  /// the alignment cannot be reached in this many bytes, no bytes are
727  /// emitted.
728  virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
729  unsigned ValueSize = 1,
730  unsigned MaxBytesToEmit = 0);
731 
732  /// Emit nops until the byte alignment \p ByteAlignment is reached.
733  ///
734  /// This used to align code where the alignment bytes may be executed. This
735  /// can emit different bytes for different sizes to optimize execution.
736  ///
737  /// \param ByteAlignment - The alignment to reach. This must be a power of
738  /// two on some targets.
739  /// \param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
740  /// the alignment cannot be reached in this many bytes, no bytes are
741  /// emitted.
742  virtual void EmitCodeAlignment(unsigned ByteAlignment,
743  unsigned MaxBytesToEmit = 0);
744 
745  /// Emit some number of copies of \p Value until the byte offset \p
746  /// Offset is reached.
747  ///
748  /// This is used to implement assembler directives such as .org.
749  ///
750  /// \param Offset - The offset to reach. This may be an expression, but the
751  /// expression must be associated with the current section.
752  /// \param Value - The value to use when filling bytes.
753  virtual void emitValueToOffset(const MCExpr *Offset, unsigned char Value,
754  SMLoc Loc);
755 
756  virtual void
758 
759  virtual void
761 
762  /// @}
763 
764  /// Switch to a new logical file. This is used to implement the '.file
765  /// "foo.c"' assembler directive.
766  virtual void EmitFileDirective(StringRef Filename);
767 
768  /// Emit the "identifiers" directive. This implements the
769  /// '.ident "version foo"' assembler directive.
770  virtual void EmitIdent(StringRef IdentString) {}
771 
772  /// Associate a filename with a specified logical file number. This
773  /// implements the DWARF2 '.file 4 "foo.c"' assembler directive.
774  unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
775  StringRef Filename,
776  MD5::MD5Result *Checksum = nullptr,
778  unsigned CUID = 0) {
779  return cantFail(
780  tryEmitDwarfFileDirective(FileNo, Directory, Filename, Checksum,
781  Source, CUID));
782  }
783 
784  /// Associate a filename with a specified logical file number.
785  /// Also associate a directory, optional checksum, and optional source
786  /// text with the logical file. This implements the DWARF2
787  /// '.file 4 "dir/foo.c"' assembler directive, and the DWARF5
788  /// '.file 4 "dir/foo.c" md5 "..." source "..."' assembler directive.
789  virtual Expected<unsigned> tryEmitDwarfFileDirective(
790  unsigned FileNo, StringRef Directory, StringRef Filename,
791  MD5::MD5Result *Checksum = nullptr, Optional<StringRef> Source = None,
792  unsigned CUID = 0);
793 
794  /// Specify the "root" file of the compilation, using the ".file 0" extension.
795  virtual void emitDwarfFile0Directive(StringRef Directory, StringRef Filename,
796  MD5::MD5Result *Checksum,
798  unsigned CUID = 0);
799 
800  /// This implements the DWARF2 '.loc fileno lineno ...' assembler
801  /// directive.
802  virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
803  unsigned Column, unsigned Flags,
804  unsigned Isa, unsigned Discriminator,
805  StringRef FileName);
806 
807  /// Associate a filename with a specified logical file number, and also
808  /// specify that file's checksum information. This implements the '.cv_file 4
809  /// "foo.c"' assembler directive. Returns true on success.
810  virtual bool EmitCVFileDirective(unsigned FileNo, StringRef Filename,
811  ArrayRef<uint8_t> Checksum,
812  unsigned ChecksumKind);
813 
814  /// Introduces a function id for use with .cv_loc.
815  virtual bool EmitCVFuncIdDirective(unsigned FunctionId);
816 
817  /// Introduces an inline call site id for use with .cv_loc. Includes
818  /// extra information for inline line table generation.
819  virtual bool EmitCVInlineSiteIdDirective(unsigned FunctionId, unsigned IAFunc,
820  unsigned IAFile, unsigned IALine,
821  unsigned IACol, SMLoc Loc);
822 
823  /// This implements the CodeView '.cv_loc' assembler directive.
824  virtual void EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,
825  unsigned Line, unsigned Column,
826  bool PrologueEnd, bool IsStmt,
827  StringRef FileName, SMLoc Loc);
828 
829  /// This implements the CodeView '.cv_linetable' assembler directive.
830  virtual void EmitCVLinetableDirective(unsigned FunctionId,
831  const MCSymbol *FnStart,
832  const MCSymbol *FnEnd);
833 
834  /// This implements the CodeView '.cv_inline_linetable' assembler
835  /// directive.
836  virtual void EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
837  unsigned SourceFileId,
838  unsigned SourceLineNum,
839  const MCSymbol *FnStartSym,
840  const MCSymbol *FnEndSym);
841 
842  /// This implements the CodeView '.cv_def_range' assembler
843  /// directive.
844  virtual void EmitCVDefRangeDirective(
845  ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
846  StringRef FixedSizePortion);
847 
848  /// This implements the CodeView '.cv_stringtable' assembler directive.
849  virtual void EmitCVStringTableDirective() {}
850 
851  /// This implements the CodeView '.cv_filechecksums' assembler directive.
853 
854  /// This implements the CodeView '.cv_filechecksumoffset' assembler
855  /// directive.
856  virtual void EmitCVFileChecksumOffsetDirective(unsigned FileNo) {}
857 
858  /// This implements the CodeView '.cv_fpo_data' assembler directive.
859  virtual void EmitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc = {}) {}
860 
861  /// Emit the absolute difference between two symbols.
862  ///
863  /// \pre Offset of \c Hi is greater than the offset \c Lo.
864  virtual void emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
865  unsigned Size);
866 
867  /// Emit the absolute difference between two symbols encoded with ULEB128.
868  virtual void emitAbsoluteSymbolDiffAsULEB128(const MCSymbol *Hi,
869  const MCSymbol *Lo);
870 
871  virtual MCSymbol *getDwarfLineTableSymbol(unsigned CUID);
872  virtual void EmitCFISections(bool EH, bool Debug);
873  void EmitCFIStartProc(bool IsSimple, SMLoc Loc = SMLoc());
874  void EmitCFIEndProc();
875  virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
876  virtual void EmitCFIDefCfaOffset(int64_t Offset);
877  virtual void EmitCFIDefCfaRegister(int64_t Register);
878  virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
879  virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
880  virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
881  virtual void EmitCFIRememberState();
882  virtual void EmitCFIRestoreState();
883  virtual void EmitCFISameValue(int64_t Register);
884  virtual void EmitCFIRestore(int64_t Register);
885  virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
886  virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
887  virtual void EmitCFIEscape(StringRef Values);
888  virtual void EmitCFIReturnColumn(int64_t Register);
889  virtual void EmitCFIGnuArgsSize(int64_t Size);
890  virtual void EmitCFISignalFrame();
891  virtual void EmitCFIUndefined(int64_t Register);
892  virtual void EmitCFIRegister(int64_t Register1, int64_t Register2);
893  virtual void EmitCFIWindowSave();
894 
895  virtual void EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc = SMLoc());
896  virtual void EmitWinCFIEndProc(SMLoc Loc = SMLoc());
897  virtual void EmitWinCFIStartChained(SMLoc Loc = SMLoc());
898  virtual void EmitWinCFIEndChained(SMLoc Loc = SMLoc());
899  virtual void EmitWinCFIPushReg(unsigned Register, SMLoc Loc = SMLoc());
900  virtual void EmitWinCFISetFrame(unsigned Register, unsigned Offset,
901  SMLoc Loc = SMLoc());
902  virtual void EmitWinCFIAllocStack(unsigned Size, SMLoc Loc = SMLoc());
903  virtual void EmitWinCFISaveReg(unsigned Register, unsigned Offset,
904  SMLoc Loc = SMLoc());
905  virtual void EmitWinCFISaveXMM(unsigned Register, unsigned Offset,
906  SMLoc Loc = SMLoc());
907  virtual void EmitWinCFIPushFrame(bool Code, SMLoc Loc = SMLoc());
908  virtual void EmitWinCFIEndProlog(SMLoc Loc = SMLoc());
909  virtual void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except,
910  SMLoc Loc = SMLoc());
911  virtual void EmitWinEHHandlerData(SMLoc Loc = SMLoc());
912 
913  virtual void emitCGProfileEntry(const MCSymbolRefExpr *From,
914  const MCSymbolRefExpr *To, uint64_t Count);
915 
916  /// Get the .pdata section used for the given section. Typically the given
917  /// section is either the main .text section or some other COMDAT .text
918  /// section, but it may be any section containing code.
919  MCSection *getAssociatedPDataSection(const MCSection *TextSec);
920 
921  /// Get the .xdata section used for the given section.
922  MCSection *getAssociatedXDataSection(const MCSection *TextSec);
923 
924  virtual void EmitSyntaxDirective();
925 
926  /// Emit a .reloc directive.
927  /// Returns true if the relocation could not be emitted because Name is not
928  /// known.
929  virtual bool EmitRelocDirective(const MCExpr &Offset, StringRef Name,
930  const MCExpr *Expr, SMLoc Loc,
931  const MCSubtargetInfo &STI) {
932  return true;
933  }
934 
935  virtual void EmitAddrsig() {}
936  virtual void EmitAddrsigSym(const MCSymbol *Sym) {}
937 
938  /// Emit the given \p Instruction into the current section.
939  /// PrintSchedInfo == true then schedul comment should be added to output
940  virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
941  bool PrintSchedInfo = false);
942 
943  /// Set the bundle alignment mode from now on in the section.
944  /// The argument is the power of 2 to which the alignment is set. The
945  /// value 0 means turn the bundle alignment off.
946  virtual void EmitBundleAlignMode(unsigned AlignPow2);
947 
948  /// The following instructions are a bundle-locked group.
949  ///
950  /// \param AlignToEnd - If true, the bundle-locked group will be aligned to
951  /// the end of a bundle.
952  virtual void EmitBundleLock(bool AlignToEnd);
953 
954  /// Ends a bundle-locked group.
955  virtual void EmitBundleUnlock();
956 
957  /// If this file is backed by a assembly streamer, this dumps the
958  /// specified string in the output .s file. This capability is indicated by
959  /// the hasRawTextSupport() predicate. By default this aborts.
960  void EmitRawText(const Twine &String);
961 
962  /// Streamer specific finalization.
963  virtual void FinishImpl();
964  /// Finish emission of machine code.
965  void Finish();
966 
967  virtual bool mayHaveInstructions(MCSection &Sec) const { return true; }
968 };
969 
970 /// Create a dummy machine code streamer, which does nothing. This is useful for
971 /// timing the assembler front end.
973 
974 /// Create a machine code streamer which will print out assembly for the native
975 /// target, suitable for compiling with a native assembler.
976 ///
977 /// \param InstPrint - If given, the instruction printer to use. If not given
978 /// the MCInst representation will be printed. This method takes ownership of
979 /// InstPrint.
980 ///
981 /// \param CE - If given, a code emitter to use to show the instruction
982 /// encoding inline with the assembly. This method takes ownership of \p CE.
983 ///
984 /// \param TAB - If given, a target asm backend to use to show the fixup
985 /// information in conjunction with encoding information. This method takes
986 /// ownership of \p TAB.
987 ///
988 /// \param ShowInst - Whether to show the MCInst representation inline with
989 /// the assembly.
991  std::unique_ptr<formatted_raw_ostream> OS,
992  bool isVerboseAsm, bool useDwarfDirectory,
993  MCInstPrinter *InstPrint, MCCodeEmitter *CE,
994  MCAsmBackend *TAB, bool ShowInst);
995 
996 } // end namespace llvm
997 
998 #endif // LLVM_MC_MCSTREAMER_H
void cantFail(Error Err, const char *Msg=nullptr)
Report a fatal error if Err is a failure value.
Definition: Error.h:704
Profile::FuncID FuncId
Definition: Profile.cpp:321
Instances of this class represent a uniqued identifier for a section in the current translation unit...
Definition: MCSection.h:39
unsigned GetSymbolOrder(const MCSymbol *Sym) const
Returns an index to represent the order a symbol was emitted in.
Definition: MCStreamer.h:351
virtual void EmitCVStringTableDirective()
This implements the CodeView &#39;.cv_stringtable&#39; assembler directive.
Definition: MCStreamer.h:849
LLVMContext & Context
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:42
virtual void AddBlankLine()
AddBlankLine - Emit a blank line to a .s file to pretty it up.
Definition: MCStreamer.h:327
virtual void EmitAddrsigSym(const MCSymbol *Sym)
Definition: MCStreamer.h:936
void SwitchSectionNoChange(MCSection *Section, const MCExpr *Subsection=nullptr)
Set the current section where code is being emitted to Section.
Definition: MCStreamer.h:404
Target specific streamer interface.
Definition: MCStreamer.h:83
unsigned Reg
MCStreamer * createNullStreamer(MCContext &Ctx)
Create a dummy machine code streamer, which does nothing.
void PushSection()
Save the current and previous section on the section stack.
Definition: MCStreamer.h:362
virtual void EmitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc={})
This implements the CodeView &#39;.cv_fpo_data&#39; assembler directive.
Definition: MCStreamer.h:859
virtual void emitValue(const MCExpr *Value)
Definition: MCStreamer.cpp:67
MCDataRegionType
Definition: MCDirectives.h:56
COFF::SymbolStorageClass StorageClass
Definition: COFFYAML.cpp:354
unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory, StringRef Filename, MD5::MD5Result *Checksum=nullptr, Optional< StringRef > Source=None, unsigned CUID=0)
Associate a filename with a specified logical file number.
Definition: MCStreamer.h:774
MCContext & getContext() const
Definition: MCStreamer.h:253
amdgpu Simplify well known AMD library false Value Value const Twine & Name
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:36
Represent a reference to a symbol from inside an expression.
Definition: MCExpr.h:166
Tagged union holding either a T or a Error.
Definition: CachePruning.h:23
virtual void emitLabel(MCSymbol *Symbol)
Definition: MCStreamer.cpp:49
unsigned getNumWinFrameInfos()
Definition: MCStreamer.h:271
ArrayRef< std::unique_ptr< WinEH::FrameInfo > > getWinFrameInfos() const
Definition: MCStreamer.h:272
Context object for machine code objects.
Definition: MCContext.h:63
MCSectionSubPair getPreviousSection() const
Return the previous section that the streamer is emitting code to.
Definition: MCStreamer.h:343
virtual void AddComment(const Twine &T, bool EOL=true)
Add a textual comment.
Definition: MCStreamer.h:306
virtual void EmitCVFileChecksumsDirective()
This implements the CodeView &#39;.cv_filechecksums&#39; assembler directive.
Definition: MCStreamer.h:852
virtual void finish()
Definition: MCStreamer.cpp:51
MCStreamer * createAsmStreamer(MCContext &Ctx, std::unique_ptr< formatted_raw_ostream > OS, bool isVerboseAsm, bool useDwarfDirectory, MCInstPrinter *InstPrint, MCCodeEmitter *CE, MCAsmBackend *TAB, bool ShowInst)
Create a machine code streamer which will print out assembly for the native target, suitable for compiling with a native assembler.
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: APInt.h:33
bool getUseAssemblerInfoForParsing()
Definition: MCStreamer.h:258
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:161
virtual MCAssembler * getAssemblerPtr()
Definition: MCStreamer.h:255
virtual bool hasRawTextSupport() const
Return true if this asm streamer supports emitting unformatted text to the .s file with EmitRawText...
Definition: MCStreamer.h:287
Flag
These should be considered private to the implementation of the MCInstrDesc class.
Definition: MCInstrDesc.h:118
Streaming machine code generation interface.
Definition: MCStreamer.h:183
WinEH::FrameInfo * getCurrentWinFrameInfo()
Definition: MCStreamer.h:226
MCTargetStreamer * getTargetStreamer()
Definition: MCStreamer.h:260
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
MCCodeEmitter - Generic instruction encoding interface.
Definition: MCCodeEmitter.h:22
virtual void EmitCodePaddingBasicBlockStart(const MCCodePaddingContext &Context)
Definition: MCStreamer.h:757
MCLOHType
Linker Optimization Hint Type.
virtual bool mayHaveInstructions(MCSection &Sec) const
Definition: MCStreamer.h:967
void setUseAssemblerInfoForParsing(bool v)
Definition: MCStreamer.h:257
virtual void EmitAddrsig()
Definition: MCStreamer.h:935
virtual void EmitIdent(StringRef IdentString)
Emit the "identifiers" directive.
Definition: MCStreamer.h:770
size_t size() const
Definition: SmallVector.h:53
bool SubSection(const MCExpr *Subsection)
Definition: MCStreamer.h:386
virtual void EmitDataRegion(MCDataRegionType Kind)
Note in the output the specified region Kind.
Definition: MCStreamer.h:446
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
MCSectionSubPair getCurrentSection() const
Return the current section that the streamer is emitting code to.
Definition: MCStreamer.h:335
MCStreamer & getStreamer()
Definition: MCStreamer.h:91
std::pair< MCSection *, const MCExpr * > MCSectionSubPair
Definition: MCStreamer.h:56
BlockVerifier::State From
virtual void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args)
Emit a Linker Optimization Hint (LOH) directive.
Definition: MCStreamer.h:550
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:847
bool isVector(MCInstrInfo const &MCII, MCInst const &MCI)
virtual bool EmitRelocDirective(const MCExpr &Offset, StringRef Name, const MCExpr *Expr, SMLoc Loc, const MCSubtargetInfo &STI)
Emit a .reloc directive.
Definition: MCStreamer.h:929
MCStreamer & Streamer
Definition: MCStreamer.h:85
Promote Memory to Register
Definition: Mem2Reg.cpp:110
virtual void prettyPrintAsm(MCInstPrinter &InstPrinter, raw_ostream &OS, const MCInst &Inst, const MCSubtargetInfo &STI)
Definition: MCStreamer.cpp:881
virtual void EmitBuildVersion(unsigned Platform, unsigned Major, unsigned Minor, unsigned Update)
Emit/Specify Mach-O build version command.
Definition: MCStreamer.h:454
MCSymbolAttr
Definition: MCDirectives.h:19
virtual void changeSection(const MCSection *CurSection, MCSection *Section, const MCExpr *SubSection, raw_ostream &OS)
Update streamer for a new active section.
Definition: MCStreamer.cpp:53
Target - Wrapper for Target specific information.
MCSection * getCurrentSectionOnly() const
Definition: MCStreamer.h:340
MCTargetStreamer(MCStreamer &S)
Definition: MCStreamer.cpp:42
virtual void EmitCVFileChecksumOffsetDirective(unsigned FileNo)
This implements the CodeView &#39;.cv_filechecksumoffset&#39; assembler directive.
Definition: MCStreamer.h:856
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator end()
Definition: SmallVector.h:133
This is an instance of a target assembly language printer that converts an MCInst to valid target ass...
Definition: MCInstPrinter.h:40
unsigned getNumFrameInfos()
Definition: MCStreamer.h:264
virtual void EmitLinkerOptions(ArrayRef< std::string > Kind)
Emit the given list Options of strings as linker options into the output.
Definition: MCStreamer.h:443
LLVM_NODISCARD bool empty() const
Definition: SmallVector.h:56
MCAssemblerFlag
Definition: MCDirectives.h:48
#define I(x, y, z)
Definition: MD5.cpp:58
virtual void EmitCodePaddingBasicBlockEnd(const MCCodePaddingContext &Context)
Definition: MCStreamer.h:760
Generic base class for all target subtargets.
uint32_t Size
Definition: Profile.cpp:47
ValueT lookup(const_arg_type_t< KeyT > Val) const
lookup - Return the entry for the specified key, or a default constructed value if no such entry exis...
Definition: DenseMap.h:186
const unsigned Kind
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
bool PopSection()
Restore the current and previous section from the section stack.
Definition: MCStreamer.h:371
MCVersionMinType
Definition: MCDirectives.h:64
LLVM Value Representation.
Definition: Value.h:73
Generic interface to target specific assembler backends.
Definition: MCAsmBackend.h:42
ArrayRef< MCDwarfFrameInfo > getDwarfFrameInfos() const
Definition: MCStreamer.h:265
static cl::opt< bool, true > Debug("debug", cl::desc("Enable debug output"), cl::Hidden, cl::location(DebugFlag))
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
virtual void EmitVersionMin(MCVersionMinType Type, unsigned Major, unsigned Minor, unsigned Update)
Specify the Mach-O minimum deployment target version.
Definition: MCStreamer.h:449
virtual void emitDwarfFileDirective(StringRef Directive)
Definition: MCStreamer.cpp:63
Represents a location in source code.
Definition: SMLoc.h:24
virtual bool isVerboseAsm() const
Return true if this streamer supports verbose assembly and if it is enabled.
Definition: MCStreamer.h:283
void setTargetStreamer(MCTargetStreamer *TS)
Definition: MCStreamer.h:245
virtual void emitAssignment(MCSymbol *Symbol, const MCExpr *Value)
Definition: MCStreamer.cpp:75
constexpr char Args[]
Key for Kernel::Metadata::mArgs.
virtual bool isIntegratedAssemblerRequired() const
Is the integrated assembler required for this streamer to function correctly?
Definition: MCStreamer.h:291