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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 public:
235  MCStreamer(const MCStreamer &) = delete;
236  MCStreamer &operator=(const MCStreamer &) = delete;
237  virtual ~MCStreamer();
238 
239  void visitUsedExpr(const MCExpr &Expr);
240  virtual void visitUsedSymbol(const MCSymbol &Sym);
241 
243  TargetStreamer.reset(TS);
244  }
245 
246  /// State management
247  ///
248  virtual void reset();
249 
250  MCContext &getContext() const { return Context; }
251 
252  virtual MCAssembler *getAssemblerPtr() { return nullptr; }
253 
254  void setUseAssemblerInfoForParsing(bool v) { UseAssemblerInfoForParsing = v; }
255  bool getUseAssemblerInfoForParsing() { return UseAssemblerInfoForParsing; }
256 
258  return TargetStreamer.get();
259  }
260 
261  unsigned getNumFrameInfos() { return DwarfFrameInfos.size(); }
263  return DwarfFrameInfos;
264  }
265 
266  bool hasUnfinishedDwarfFrameInfo();
267 
268  unsigned getNumWinFrameInfos() { return WinFrameInfos.size(); }
270  return WinFrameInfos;
271  }
272 
273  void generateCompactUnwindEncodings(MCAsmBackend *MAB);
274 
275  /// \name Assembly File Formatting.
276  /// @{
277 
278  /// Return true if this streamer supports verbose assembly and if it is
279  /// enabled.
280  virtual bool isVerboseAsm() const { return false; }
281 
282  /// Return true if this asm streamer supports emitting unformatted text
283  /// to the .s file with EmitRawText.
284  virtual bool hasRawTextSupport() const { return false; }
285 
286  /// Is the integrated assembler required for this streamer to function
287  /// correctly?
288  virtual bool isIntegratedAssemblerRequired() const { return false; }
289 
290  /// Add a textual comment.
291  ///
292  /// Typically for comments that can be emitted to the generated .s
293  /// file if applicable as a QoI issue to make the output of the compiler
294  /// more readable. This only affects the MCAsmStreamer, and only when
295  /// verbose assembly output is enabled.
296  ///
297  /// If the comment includes embedded \n's, they will each get the comment
298  /// prefix as appropriate. The added comment should not end with a \n.
299  /// By default, each comment is terminated with an end of line, i.e. the
300  /// EOL param is set to true by default. If one prefers not to end the
301  /// comment with a new line then the EOL param should be passed
302  /// with a false value.
303  virtual void AddComment(const Twine &T, bool EOL = true) {}
304 
305  /// Return a raw_ostream that comments can be written to. Unlike
306  /// AddComment, you are required to terminate comments with \n if you use this
307  /// method.
308  virtual raw_ostream &GetCommentOS();
309 
310  /// Print T and prefix it with the comment string (normally #) and
311  /// optionally a tab. This prints the comment immediately, not at the end of
312  /// the current line. It is basically a safe version of EmitRawText: since it
313  /// only prints comments, the object streamer ignores it instead of asserting.
314  virtual void emitRawComment(const Twine &T, bool TabPrefix = true);
315 
316  /// Add explicit comment T. T is required to be a valid
317  /// comment in the output and does not need to be escaped.
318  virtual void addExplicitComment(const Twine &T);
319 
320  /// Emit added explicit comments.
321  virtual void emitExplicitComments();
322 
323  /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
324  virtual void AddBlankLine() {}
325 
326  /// @}
327 
328  /// \name Symbol & Section Management
329  /// @{
330 
331  /// Return the current section that the streamer is emitting code to.
333  if (!SectionStack.empty())
334  return SectionStack.back().first;
335  return MCSectionSubPair();
336  }
337  MCSection *getCurrentSectionOnly() const { return getCurrentSection().first; }
338 
339  /// Return the previous section that the streamer is emitting code to.
341  if (!SectionStack.empty())
342  return SectionStack.back().second;
343  return MCSectionSubPair();
344  }
345 
346  /// Returns an index to represent the order a symbol was emitted in.
347  /// (zero if we did not emit that symbol)
348  unsigned GetSymbolOrder(const MCSymbol *Sym) const {
349  return SymbolOrdering.lookup(Sym);
350  }
351 
352  /// Update streamer for a new active section.
353  ///
354  /// This is called by PopSection and SwitchSection, if the current
355  /// section changes.
356  virtual void ChangeSection(MCSection *, const MCExpr *);
357 
358  /// Save the current and previous section on the section stack.
359  void PushSection() {
360  SectionStack.push_back(
361  std::make_pair(getCurrentSection(), getPreviousSection()));
362  }
363 
364  /// Restore the current and previous section from the section stack.
365  /// Calls ChangeSection as needed.
366  ///
367  /// Returns false if the stack was empty.
368  bool PopSection() {
369  if (SectionStack.size() <= 1)
370  return false;
371  auto I = SectionStack.end();
372  --I;
373  MCSectionSubPair OldSection = I->first;
374  --I;
375  MCSectionSubPair NewSection = I->first;
376 
377  if (OldSection != NewSection)
378  ChangeSection(NewSection.first, NewSection.second);
379  SectionStack.pop_back();
380  return true;
381  }
382 
383  bool SubSection(const MCExpr *Subsection) {
384  if (SectionStack.empty())
385  return false;
386 
387  SwitchSection(SectionStack.back().first.first, Subsection);
388  return true;
389  }
390 
391  /// Set the current section where code is being emitted to \p Section. This
392  /// is required to update CurSection.
393  ///
394  /// This corresponds to assembler directives like .section, .text, etc.
395  virtual void SwitchSection(MCSection *Section,
396  const MCExpr *Subsection = nullptr);
397 
398  /// Set the current section where code is being emitted to \p Section.
399  /// This is required to update CurSection. This version does not call
400  /// ChangeSection.
402  const MCExpr *Subsection = nullptr) {
403  assert(Section && "Cannot switch to a null section!");
404  MCSectionSubPair curSection = SectionStack.back().first;
405  SectionStack.back().second = curSection;
406  if (MCSectionSubPair(Section, Subsection) != curSection)
407  SectionStack.back().first = MCSectionSubPair(Section, Subsection);
408  }
409 
410  /// Create the default sections and set the initial one.
411  virtual void InitSections(bool NoExecStack);
412 
413  MCSymbol *endSection(MCSection *Section);
414 
415  /// Sets the symbol's section.
416  ///
417  /// Each emitted symbol will be tracked in the ordering table,
418  /// so we can sort on them later.
419  void AssignFragment(MCSymbol *Symbol, MCFragment *Fragment);
420 
421  /// Emit a label for \p Symbol into the current section.
422  ///
423  /// This corresponds to an assembler statement such as:
424  /// foo:
425  ///
426  /// \param Symbol - The symbol to emit. A given symbol should only be
427  /// emitted as a label once, and symbols emitted as a label should never be
428  /// used in an assignment.
429  // FIXME: These emission are non-const because we mutate the symbol to
430  // add the section we're emitting it to later.
431  virtual void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc());
432 
433  virtual void EmitEHSymAttributes(const MCSymbol *Symbol, MCSymbol *EHSymbol);
434 
435  /// Note in the output the specified \p Flag.
436  virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
437 
438  /// Emit the given list \p Options of strings as linker
439  /// options into the output.
441 
442  /// Note in the output the specified region \p Kind.
444 
445  /// Specify the Mach-O minimum deployment target version.
446  virtual void EmitVersionMin(MCVersionMinType Type, unsigned Major,
447  unsigned Minor, unsigned Update) {}
448 
449  /// Emit/Specify Mach-O build version command.
450  /// \p Platform should be one of MachO::PlatformType.
451  virtual void EmitBuildVersion(unsigned Platform, unsigned Major,
452  unsigned Minor, unsigned Update) {}
453 
454  void EmitVersionForTarget(const Triple &Target);
455 
456  /// Note in the output that the specified \p Func is a Thumb mode
457  /// function (ARM target only).
458  virtual void EmitThumbFunc(MCSymbol *Func);
459 
460  /// Emit an assignment of \p Value to \p Symbol.
461  ///
462  /// This corresponds to an assembler statement such as:
463  /// symbol = value
464  ///
465  /// The assignment generates no code, but has the side effect of binding the
466  /// value in the current context. For the assembly streamer, this prints the
467  /// binding into the .s file.
468  ///
469  /// \param Symbol - The symbol being assigned to.
470  /// \param Value - The value for the symbol.
471  virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
472 
473  /// Emit an weak reference from \p Alias to \p Symbol.
474  ///
475  /// This corresponds to an assembler statement such as:
476  /// .weakref alias, symbol
477  ///
478  /// \param Alias - The alias that is being created.
479  /// \param Symbol - The symbol being aliased.
480  virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
481 
482  /// Add the given \p Attribute to \p Symbol.
483  virtual bool EmitSymbolAttribute(MCSymbol *Symbol,
484  MCSymbolAttr Attribute) = 0;
485 
486  /// Set the \p DescValue for the \p Symbol.
487  ///
488  /// \param Symbol - The symbol to have its n_desc field set.
489  /// \param DescValue - The value to set into the n_desc field.
490  virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
491 
492  /// Start emitting COFF symbol definition
493  ///
494  /// \param Symbol - The symbol to have its External & Type fields set.
495  virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
496 
497  /// Emit the storage class of the symbol.
498  ///
499  /// \param StorageClass - The storage class the symbol should have.
500  virtual void EmitCOFFSymbolStorageClass(int StorageClass);
501 
502  /// Emit the type of the symbol.
503  ///
504  /// \param Type - A COFF type identifier (see COFF::SymbolType in X86COFF.h)
505  virtual void EmitCOFFSymbolType(int Type);
506 
507  /// Marks the end of the symbol definition.
508  virtual void EndCOFFSymbolDef();
509 
510  virtual void EmitCOFFSafeSEH(MCSymbol const *Symbol);
511 
512  /// Emits the symbol table index of a Symbol into the current section.
513  virtual void EmitCOFFSymbolIndex(MCSymbol const *Symbol);
514 
515  /// Emits a COFF section index.
516  ///
517  /// \param Symbol - Symbol the section number relocation should point to.
518  virtual void EmitCOFFSectionIndex(MCSymbol const *Symbol);
519 
520  /// Emits a COFF section relative relocation.
521  ///
522  /// \param Symbol - Symbol the section relative relocation should point to.
523  virtual void EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset);
524 
525  /// Emit an ELF .size directive.
526  ///
527  /// This corresponds to an assembler statement such as:
528  /// .size symbol, expression
529  virtual void emitELFSize(MCSymbol *Symbol, const MCExpr *Value);
530 
531  /// Emit an ELF .symver directive.
532  ///
533  /// This corresponds to an assembler statement such as:
534  /// .symver _start, foo@@SOME_VERSION
535  /// \param AliasName - The versioned alias (i.e. "foo@@SOME_VERSION")
536  /// \param Aliasee - The aliased symbol (i.e. "_start")
537  virtual void emitELFSymverDirective(StringRef AliasName,
538  const MCSymbol *Aliasee);
539 
540  /// Emit a Linker Optimization Hint (LOH) directive.
541  /// \param Args - Arguments of the LOH.
542  virtual void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {}
543 
544  /// Emit a common symbol.
545  ///
546  /// \param Symbol - The common symbol to emit.
547  /// \param Size - The size of the common symbol.
548  /// \param ByteAlignment - The alignment of the symbol if
549  /// non-zero. This must be a power of 2.
550  virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
551  unsigned ByteAlignment) = 0;
552 
553  /// Emit a local common (.lcomm) symbol.
554  ///
555  /// \param Symbol - The common symbol to emit.
556  /// \param Size - The size of the common symbol.
557  /// \param ByteAlignment - The alignment of the common symbol in bytes.
558  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
559  unsigned ByteAlignment);
560 
561  /// Emit the zerofill section and an optional symbol.
562  ///
563  /// \param Section - The zerofill section to create and or to put the symbol
564  /// \param Symbol - The zerofill symbol to emit, if non-NULL.
565  /// \param Size - The size of the zerofill symbol.
566  /// \param ByteAlignment - The alignment of the zerofill symbol if
567  /// non-zero. This must be a power of 2 on some targets.
568  virtual void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
569  uint64_t Size = 0, unsigned ByteAlignment = 0) = 0;
570 
571  /// Emit a thread local bss (.tbss) symbol.
572  ///
573  /// \param Section - The thread local common section.
574  /// \param Symbol - The thread local common symbol to emit.
575  /// \param Size - The size of the symbol.
576  /// \param ByteAlignment - The alignment of the thread local common symbol
577  /// if non-zero. This must be a power of 2 on some targets.
578  virtual void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
579  uint64_t Size, unsigned ByteAlignment = 0);
580 
581  /// @}
582  /// \name Generating Data
583  /// @{
584 
585  /// Emit the bytes in \p Data into the output.
586  ///
587  /// This is used to implement assembler directives such as .byte, .ascii,
588  /// etc.
589  virtual void EmitBytes(StringRef Data);
590 
591  /// Functionally identical to EmitBytes. When emitting textual assembly, this
592  /// method uses .byte directives instead of .ascii or .asciz for readability.
593  virtual void EmitBinaryData(StringRef Data);
594 
595  /// Emit the expression \p Value into the output as a native
596  /// integer of the given \p Size bytes.
597  ///
598  /// This is used to implement assembler directives such as .word, .quad,
599  /// etc.
600  ///
601  /// \param Value - The value to emit.
602  /// \param Size - The size of the integer (in bytes) to emit. This must
603  /// match a native machine width.
604  /// \param Loc - The location of the expression for error reporting.
605  virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
606  SMLoc Loc = SMLoc());
607 
608  void EmitValue(const MCExpr *Value, unsigned Size, SMLoc Loc = SMLoc());
609 
610  /// Special case of EmitValue that avoids the client having
611  /// to pass in a MCExpr for constant integers.
612  virtual void EmitIntValue(uint64_t Value, unsigned Size);
613 
614  virtual void EmitULEB128Value(const MCExpr *Value);
615 
616  virtual void EmitSLEB128Value(const MCExpr *Value);
617 
618  /// Special case of EmitULEB128Value that avoids the client having to
619  /// pass in a MCExpr for constant integers.
620  void EmitULEB128IntValue(uint64_t Value);
621 
622  /// Special case of EmitSLEB128Value that avoids the client having to
623  /// pass in a MCExpr for constant integers.
624  void EmitSLEB128IntValue(int64_t Value);
625 
626  /// Special case of EmitValue that avoids the client having to pass in
627  /// a MCExpr for MCSymbols.
628  void EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
629  bool IsSectionRelative = false);
630 
631  /// Emit the expression \p Value into the output as a dtprel
632  /// (64-bit DTP relative) value.
633  ///
634  /// This is used to implement assembler directives such as .dtpreldword on
635  /// targets that support them.
636  virtual void EmitDTPRel64Value(const MCExpr *Value);
637 
638  /// Emit the expression \p Value into the output as a dtprel
639  /// (32-bit DTP relative) value.
640  ///
641  /// This is used to implement assembler directives such as .dtprelword on
642  /// targets that support them.
643  virtual void EmitDTPRel32Value(const MCExpr *Value);
644 
645  /// Emit the expression \p Value into the output as a tprel
646  /// (64-bit TP relative) value.
647  ///
648  /// This is used to implement assembler directives such as .tpreldword on
649  /// targets that support them.
650  virtual void EmitTPRel64Value(const MCExpr *Value);
651 
652  /// Emit the expression \p Value into the output as a tprel
653  /// (32-bit TP relative) value.
654  ///
655  /// This is used to implement assembler directives such as .tprelword on
656  /// targets that support them.
657  virtual void EmitTPRel32Value(const MCExpr *Value);
658 
659  /// Emit the expression \p Value into the output as a gprel64 (64-bit
660  /// GP relative) value.
661  ///
662  /// This is used to implement assembler directives such as .gpdword on
663  /// targets that support them.
664  virtual void EmitGPRel64Value(const MCExpr *Value);
665 
666  /// Emit the expression \p Value into the output as a gprel32 (32-bit
667  /// GP relative) value.
668  ///
669  /// This is used to implement assembler directives such as .gprel32 on
670  /// targets that support them.
671  virtual void EmitGPRel32Value(const MCExpr *Value);
672 
673  /// Emit NumBytes bytes worth of the value specified by FillValue.
674  /// This implements directives such as '.space'.
675  void emitFill(uint64_t NumBytes, uint8_t FillValue);
676 
677  /// Emit \p Size bytes worth of the value specified by \p FillValue.
678  ///
679  /// This is used to implement assembler directives such as .space or .skip.
680  ///
681  /// \param NumBytes - The number of bytes to emit.
682  /// \param FillValue - The value to use when filling bytes.
683  /// \param Loc - The location of the expression for error reporting.
684  virtual void emitFill(const MCExpr &NumBytes, uint64_t FillValue,
685  SMLoc Loc = SMLoc());
686 
687  /// Emit \p NumValues copies of \p Size bytes. Each \p Size bytes is
688  /// taken from the lowest order 4 bytes of \p Expr expression.
689  ///
690  /// This is used to implement assembler directives such as .fill.
691  ///
692  /// \param NumValues - The number of copies of \p Size bytes to emit.
693  /// \param Size - The size (in bytes) of each repeated value.
694  /// \param Expr - The expression from which \p Size bytes are used.
695  virtual void emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
696  SMLoc Loc = SMLoc());
697 
698  /// Emit NumBytes worth of zeros.
699  /// This function properly handles data in virtual sections.
700  void EmitZeros(uint64_t NumBytes);
701 
702  /// Emit some number of copies of \p Value until the byte alignment \p
703  /// ByteAlignment is reached.
704  ///
705  /// If the number of bytes need to emit for the alignment is not a multiple
706  /// of \p ValueSize, then the contents of the emitted fill bytes is
707  /// undefined.
708  ///
709  /// This used to implement the .align assembler directive.
710  ///
711  /// \param ByteAlignment - The alignment to reach. This must be a power of
712  /// two on some targets.
713  /// \param Value - The value to use when filling bytes.
714  /// \param ValueSize - The size of the integer (in bytes) to emit for
715  /// \p Value. This must match a native machine width.
716  /// \param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
717  /// the alignment cannot be reached in this many bytes, no bytes are
718  /// emitted.
719  virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
720  unsigned ValueSize = 1,
721  unsigned MaxBytesToEmit = 0);
722 
723  /// Emit nops until the byte alignment \p ByteAlignment is reached.
724  ///
725  /// This used to align code where the alignment bytes may be executed. This
726  /// can emit different bytes for different sizes to optimize execution.
727  ///
728  /// \param ByteAlignment - The alignment to reach. This must be a power of
729  /// two on some targets.
730  /// \param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
731  /// the alignment cannot be reached in this many bytes, no bytes are
732  /// emitted.
733  virtual void EmitCodeAlignment(unsigned ByteAlignment,
734  unsigned MaxBytesToEmit = 0);
735 
736  /// Emit some number of copies of \p Value until the byte offset \p
737  /// Offset is reached.
738  ///
739  /// This is used to implement assembler directives such as .org.
740  ///
741  /// \param Offset - The offset to reach. This may be an expression, but the
742  /// expression must be associated with the current section.
743  /// \param Value - The value to use when filling bytes.
744  virtual void emitValueToOffset(const MCExpr *Offset, unsigned char Value,
745  SMLoc Loc);
746 
747  virtual void
749 
750  virtual void
752 
753  /// @}
754 
755  /// Switch to a new logical file. This is used to implement the '.file
756  /// "foo.c"' assembler directive.
757  virtual void EmitFileDirective(StringRef Filename);
758 
759  /// Emit the "identifiers" directive. This implements the
760  /// '.ident "version foo"' assembler directive.
761  virtual void EmitIdent(StringRef IdentString) {}
762 
763  /// Associate a filename with a specified logical file number. This
764  /// implements the DWARF2 '.file 4 "foo.c"' assembler directive.
765  unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
766  StringRef Filename,
767  MD5::MD5Result *Checksum = nullptr,
769  unsigned CUID = 0) {
770  return cantFail(
771  tryEmitDwarfFileDirective(FileNo, Directory, Filename, Checksum,
772  Source, CUID));
773  }
774 
775  /// Associate a filename with a specified logical file number.
776  /// Also associate a directory, optional checksum, and optional source
777  /// text with the logical file. This implements the DWARF2
778  /// '.file 4 "dir/foo.c"' assembler directive, and the DWARF5
779  /// '.file 4 "dir/foo.c" md5 "..." source "..."' assembler directive.
780  virtual Expected<unsigned> tryEmitDwarfFileDirective(
781  unsigned FileNo, StringRef Directory, StringRef Filename,
782  MD5::MD5Result *Checksum = nullptr, Optional<StringRef> Source = None,
783  unsigned CUID = 0);
784 
785  /// Specify the "root" file of the compilation, using the ".file 0" extension.
786  virtual void emitDwarfFile0Directive(StringRef Directory, StringRef Filename,
787  MD5::MD5Result *Checksum,
789  unsigned CUID = 0);
790 
791  /// This implements the DWARF2 '.loc fileno lineno ...' assembler
792  /// directive.
793  virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
794  unsigned Column, unsigned Flags,
795  unsigned Isa, unsigned Discriminator,
796  StringRef FileName);
797 
798  /// Associate a filename with a specified logical file number, and also
799  /// specify that file's checksum information. This implements the '.cv_file 4
800  /// "foo.c"' assembler directive. Returns true on success.
801  virtual bool EmitCVFileDirective(unsigned FileNo, StringRef Filename,
802  ArrayRef<uint8_t> Checksum,
803  unsigned ChecksumKind);
804 
805  /// Introduces a function id for use with .cv_loc.
806  virtual bool EmitCVFuncIdDirective(unsigned FunctionId);
807 
808  /// Introduces an inline call site id for use with .cv_loc. Includes
809  /// extra information for inline line table generation.
810  virtual bool EmitCVInlineSiteIdDirective(unsigned FunctionId, unsigned IAFunc,
811  unsigned IAFile, unsigned IALine,
812  unsigned IACol, SMLoc Loc);
813 
814  /// This implements the CodeView '.cv_loc' assembler directive.
815  virtual void EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,
816  unsigned Line, unsigned Column,
817  bool PrologueEnd, bool IsStmt,
818  StringRef FileName, SMLoc Loc);
819 
820  /// This implements the CodeView '.cv_linetable' assembler directive.
821  virtual void EmitCVLinetableDirective(unsigned FunctionId,
822  const MCSymbol *FnStart,
823  const MCSymbol *FnEnd);
824 
825  /// This implements the CodeView '.cv_inline_linetable' assembler
826  /// directive.
827  virtual void EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
828  unsigned SourceFileId,
829  unsigned SourceLineNum,
830  const MCSymbol *FnStartSym,
831  const MCSymbol *FnEndSym);
832 
833  /// This implements the CodeView '.cv_def_range' assembler
834  /// directive.
835  virtual void EmitCVDefRangeDirective(
836  ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
837  StringRef FixedSizePortion);
838 
839  /// This implements the CodeView '.cv_stringtable' assembler directive.
840  virtual void EmitCVStringTableDirective() {}
841 
842  /// This implements the CodeView '.cv_filechecksums' assembler directive.
844 
845  /// This implements the CodeView '.cv_filechecksumoffset' assembler
846  /// directive.
847  virtual void EmitCVFileChecksumOffsetDirective(unsigned FileNo) {}
848 
849  /// This implements the CodeView '.cv_fpo_data' assembler directive.
850  virtual void EmitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc = {}) {}
851 
852  /// Emit the absolute difference between two symbols.
853  ///
854  /// \pre Offset of \c Hi is greater than the offset \c Lo.
855  virtual void emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
856  unsigned Size);
857 
858  /// Emit the absolute difference between two symbols encoded with ULEB128.
859  virtual void emitAbsoluteSymbolDiffAsULEB128(const MCSymbol *Hi,
860  const MCSymbol *Lo);
861 
862  virtual MCSymbol *getDwarfLineTableSymbol(unsigned CUID);
863  virtual void EmitCFISections(bool EH, bool Debug);
864  void EmitCFIStartProc(bool IsSimple);
865  void EmitCFIEndProc();
866  virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
867  virtual void EmitCFIDefCfaOffset(int64_t Offset);
868  virtual void EmitCFIDefCfaRegister(int64_t Register);
869  virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
870  virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
871  virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
872  virtual void EmitCFIRememberState();
873  virtual void EmitCFIRestoreState();
874  virtual void EmitCFISameValue(int64_t Register);
875  virtual void EmitCFIRestore(int64_t Register);
876  virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
877  virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
878  virtual void EmitCFIEscape(StringRef Values);
879  virtual void EmitCFIReturnColumn(int64_t Register);
880  virtual void EmitCFIGnuArgsSize(int64_t Size);
881  virtual void EmitCFISignalFrame();
882  virtual void EmitCFIUndefined(int64_t Register);
883  virtual void EmitCFIRegister(int64_t Register1, int64_t Register2);
884  virtual void EmitCFIWindowSave();
885 
886  virtual void EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc = SMLoc());
887  virtual void EmitWinCFIEndProc(SMLoc Loc = SMLoc());
888  virtual void EmitWinCFIStartChained(SMLoc Loc = SMLoc());
889  virtual void EmitWinCFIEndChained(SMLoc Loc = SMLoc());
890  virtual void EmitWinCFIPushReg(unsigned Register, SMLoc Loc = SMLoc());
891  virtual void EmitWinCFISetFrame(unsigned Register, unsigned Offset,
892  SMLoc Loc = SMLoc());
893  virtual void EmitWinCFIAllocStack(unsigned Size, SMLoc Loc = SMLoc());
894  virtual void EmitWinCFISaveReg(unsigned Register, unsigned Offset,
895  SMLoc Loc = SMLoc());
896  virtual void EmitWinCFISaveXMM(unsigned Register, unsigned Offset,
897  SMLoc Loc = SMLoc());
898  virtual void EmitWinCFIPushFrame(bool Code, SMLoc Loc = SMLoc());
899  virtual void EmitWinCFIEndProlog(SMLoc Loc = SMLoc());
900  virtual void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except,
901  SMLoc Loc = SMLoc());
902  virtual void EmitWinEHHandlerData(SMLoc Loc = SMLoc());
903 
904  /// Get the .pdata section used for the given section. Typically the given
905  /// section is either the main .text section or some other COMDAT .text
906  /// section, but it may be any section containing code.
907  MCSection *getAssociatedPDataSection(const MCSection *TextSec);
908 
909  /// Get the .xdata section used for the given section.
910  MCSection *getAssociatedXDataSection(const MCSection *TextSec);
911 
912  virtual void EmitSyntaxDirective();
913 
914  /// Emit a .reloc directive.
915  /// Returns true if the relocation could not be emitted because Name is not
916  /// known.
917  virtual bool EmitRelocDirective(const MCExpr &Offset, StringRef Name,
918  const MCExpr *Expr, SMLoc Loc) {
919  return true;
920  }
921 
922  /// Emit the given \p Instruction into the current section.
923  /// PrintSchedInfo == true then schedul comment should be added to output
924  virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
925  bool PrintSchedInfo = false);
926 
927  /// Set the bundle alignment mode from now on in the section.
928  /// The argument is the power of 2 to which the alignment is set. The
929  /// value 0 means turn the bundle alignment off.
930  virtual void EmitBundleAlignMode(unsigned AlignPow2);
931 
932  /// The following instructions are a bundle-locked group.
933  ///
934  /// \param AlignToEnd - If true, the bundle-locked group will be aligned to
935  /// the end of a bundle.
936  virtual void EmitBundleLock(bool AlignToEnd);
937 
938  /// Ends a bundle-locked group.
939  virtual void EmitBundleUnlock();
940 
941  /// If this file is backed by a assembly streamer, this dumps the
942  /// specified string in the output .s file. This capability is indicated by
943  /// the hasRawTextSupport() predicate. By default this aborts.
944  void EmitRawText(const Twine &String);
945 
946  /// Streamer specific finalization.
947  virtual void FinishImpl();
948  /// Finish emission of machine code.
949  void Finish();
950 
951  virtual bool mayHaveInstructions(MCSection &Sec) const { return true; }
952 };
953 
954 /// Create a dummy machine code streamer, which does nothing. This is useful for
955 /// timing the assembler front end.
957 
958 /// Create a machine code streamer which will print out assembly for the native
959 /// target, suitable for compiling with a native assembler.
960 ///
961 /// \param InstPrint - If given, the instruction printer to use. If not given
962 /// the MCInst representation will be printed. This method takes ownership of
963 /// InstPrint.
964 ///
965 /// \param CE - If given, a code emitter to use to show the instruction
966 /// encoding inline with the assembly. This method takes ownership of \p CE.
967 ///
968 /// \param TAB - If given, a target asm backend to use to show the fixup
969 /// information in conjunction with encoding information. This method takes
970 /// ownership of \p TAB.
971 ///
972 /// \param ShowInst - Whether to show the MCInst representation inline with
973 /// the assembly.
975  std::unique_ptr<formatted_raw_ostream> OS,
976  bool isVerboseAsm, bool useDwarfDirectory,
977  MCInstPrinter *InstPrint, MCCodeEmitter *CE,
978  MCAsmBackend *TAB, bool ShowInst);
979 
980 } // end namespace llvm
981 
982 #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:688
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:348
virtual void EmitCVStringTableDirective()
This implements the CodeView &#39;.cv_stringtable&#39; assembler directive.
Definition: MCStreamer.h:840
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
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:136
virtual void AddBlankLine()
AddBlankLine - Emit a blank line to a .s file to pretty it up.
Definition: MCStreamer.h:324
void SwitchSectionNoChange(MCSection *Section, const MCExpr *Subsection=nullptr)
Set the current section where code is being emitted to Section.
Definition: MCStreamer.h:401
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:359
virtual void EmitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc={})
This implements the CodeView &#39;.cv_fpo_data&#39; assembler directive.
Definition: MCStreamer.h:850
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:765
MCContext & getContext() const
Definition: MCStreamer.h:250
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:268
ArrayRef< std::unique_ptr< WinEH::FrameInfo > > getWinFrameInfos() const
Definition: MCStreamer.h:269
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:340
virtual void AddComment(const Twine &T, bool EOL=true)
Add a textual comment.
Definition: MCStreamer.h:303
virtual void EmitCVFileChecksumsDirective()
This implements the CodeView &#39;.cv_filechecksums&#39; assembler directive.
Definition: MCStreamer.h:843
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:255
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:161
virtual MCAssembler * getAssemblerPtr()
Definition: MCStreamer.h:252
virtual bool hasRawTextSupport() const
Return true if this asm streamer supports emitting unformatted text to the .s file with EmitRawText...
Definition: MCStreamer.h:284
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:257
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:748
MCLOHType
Linker Optimization Hint Type.
virtual bool mayHaveInstructions(MCSection &Sec) const
Definition: MCStreamer.h:951
void setUseAssemblerInfoForParsing(bool v)
Definition: MCStreamer.h:254
virtual void EmitIdent(StringRef IdentString)
Emit the "identifiers" directive.
Definition: MCStreamer.h:761
bool SubSection(const MCExpr *Subsection)
Definition: MCStreamer.h:383
virtual void EmitDataRegion(MCDataRegionType Kind)
Note in the output the specified region Kind.
Definition: MCStreamer.h:443
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:332
MCStreamer & getStreamer()
Definition: MCStreamer.h:91
std::pair< MCSection *, const MCExpr * > MCSectionSubPair
Definition: MCStreamer.h:56
virtual void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args)
Emit a Linker Optimization Hint (LOH) directive.
Definition: MCStreamer.h:542
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:862
bool isVector(MCInstrInfo const &MCII, MCInst const &MCI)
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:854
virtual void EmitBuildVersion(unsigned Platform, unsigned Major, unsigned Minor, unsigned Update)
Emit/Specify Mach-O build version command.
Definition: MCStreamer.h:451
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:337
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:847
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator end()
Definition: SmallVector.h:120
This is an instance of a target assembly language printer that converts an MCInst to valid target ass...
Definition: MCInstPrinter.h:41
unsigned getNumFrameInfos()
Definition: MCStreamer.h:261
virtual bool EmitRelocDirective(const MCExpr &Offset, StringRef Name, const MCExpr *Expr, SMLoc Loc)
Emit a .reloc directive.
Definition: MCStreamer.h:917
virtual void EmitLinkerOptions(ArrayRef< std::string > Kind)
Emit the given list Options of strings as linker options into the output.
Definition: MCStreamer.h:440
LLVM_NODISCARD bool empty() const
Definition: SmallVector.h:61
MCAssemblerFlag
Definition: MCDirectives.h:48
#define I(x, y, z)
Definition: MD5.cpp:58
virtual void EmitCodePaddingBasicBlockEnd(const MCCodePaddingContext &Context)
Definition: MCStreamer.h:751
Generic base class for all target subtargets.
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:181
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:368
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:262
constexpr char Size[]
Key for Kernel::Arg::Metadata::mSize.
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:44
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:446
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:280
void setTargetStreamer(MCTargetStreamer *TS)
Definition: MCStreamer.h:242
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:288