text: //===- MCELFStreamer.h - MCStreamer ELF Object File Interface ---*- C++ -*-===//
  //
  //                     The LLVM37 Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef LLVM37_MC_MCELFSTREAMER_H
  #define LLVM37_MC_MCELFSTREAMER_H
  
  #include "llvm37/ADT/SmallPtrSet.h"
  #include "llvm37/MC/MCDirectives.h"
  #include "llvm37/MC/MCObjectStreamer.h"
  #include "llvm37/MC/SectionKind.h"
  #include "llvm37/Support/DataTypes.h"
  #include <vector>
  
  namespace llvm37 {
  class MCAsmBackend;
  class MCAssembler;
  class MCCodeEmitter;
  class MCExpr;
  class MCInst;
  class raw_ostream;
  
  class MCELFStreamer : public MCObjectStreamer {
  public:
    MCELFStreamer(MCContext &Context, MCAsmBackend &TAB, raw_pwrite_stream &OS,
                  MCCodeEmitter *Emitter)
        : MCObjectStreamer(Context, TAB, OS, Emitter), SeenIdent(false) {}
  
    ~MCELFStreamer() override;
  
    /// state management
    void reset() override {
      SeenIdent = false;
      LocalCommons.clear();
      BundleGroups.clear();
      MCObjectStreamer::reset();
    }
  
    /// \name MCStreamer Interface
    /// @{
  
    void InitSections(bool NoExecStack) override;
    void ChangeSection(MCSection *Section, const MCExpr *Subsection) override;
    void EmitLabel(MCSymbol *Symbol) override;
    void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
    void EmitThumbFunc(MCSymbol *Func) override;
    void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
    bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
    void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
    void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
                          unsigned ByteAlignment) override;
    void BeginCOFFSymbolDef(const MCSymbol *Symbol) override;
    void EmitCOFFSymbolStorageClass(int StorageClass) override;
    void EmitCOFFSymbolType(int Type) override;
    void EndCOFFSymbolDef() override;
  
    void emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value) override;
  
    void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
                               unsigned ByteAlignment) override;
  
    void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
                      uint64_t Size = 0, unsigned ByteAlignment = 0) override;
    void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
                        unsigned ByteAlignment = 0) override;
    void EmitValueImpl(const MCExpr *Value, unsigned Size,
                       const SMLoc &Loc = SMLoc()) override;
  
    void EmitFileDirective(StringRef Filename) override;
  
    void EmitIdent(StringRef IdentString) override;
  
    void EmitValueToAlignment(unsigned, int64_t, unsigned, unsigned) override;
  
    void Flush() override;
  
    void FinishImpl() override;
  
    void EmitBundleAlignMode(unsigned AlignPow2) override;
    void EmitBundleLock(bool AlignToEnd) override;
    void EmitBundleUnlock() override;
  
  private:
    bool isBundleLocked() const;
    void EmitInstToFragment(const MCInst &Inst, const MCSubtargetInfo &) override;
    void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &) override;
  
    void fixSymbolsInTLSFixups(const MCExpr *expr);
  
    /// \brief Merge the content of the fragment \p EF into the fragment \p DF.
    void mergeFragment(MCDataFragment *, MCDataFragment *);
  
    bool SeenIdent;
  
    struct LocalCommon {
      const MCSymbol *Symbol;
      uint64_t Size;
      unsigned ByteAlignment;
    };
  
    std::vector<LocalCommon> LocalCommons;
  
    /// BundleGroups - The stack of fragments holding the bundle-locked
    /// instructions.
    llvm37::SmallVector<MCDataFragment *, 4> BundleGroups;
  };
  
  MCELFStreamer *createARMELFStreamer(MCContext &Context, MCAsmBackend &TAB,
                                      raw_pwrite_stream &OS,
                                      MCCodeEmitter *Emitter, bool RelaxAll,
                                      bool IsThumb);
  
  } // end namespace llvm37
  
  #endif
  