1 //===- MCObjectStreamer.h - MCStreamer Object File Interface ----*- 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 #ifndef LLVM_MC_MCOBJECTSTREAMER_H 11 #define LLVM_MC_MCOBJECTSTREAMER_H 12 13 #include "llvm/MC/MCStreamer.h" 14 15 namespace llvm { 16 class MCAssembler; 17 class MCCodeEmitter; 18 class MCSectionData; 19 class MCExpr; 20 class MCFragment; 21 class MCDataFragment; 22 class MCAsmBackend; 23 class raw_ostream; 24 25 /// \brief Streaming object file generation interface. 26 /// 27 /// This class provides an implementation of the MCStreamer interface which is 28 /// suitable for use with the assembler backend. Specific object file formats 29 /// are expected to subclass this interface to implement directives specific 30 /// to that file format or custom semantics expected by the object writer 31 /// implementation. 32 class MCObjectStreamer : public MCStreamer { 33 MCAssembler *Assembler; 34 MCSectionData *CurSectionData; 35 36 virtual void EmitInstToData(const MCInst &Inst) = 0; 37 virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame); 38 virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame); 39 40 protected: 41 MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB, 42 raw_ostream &_OS, MCCodeEmitter *_Emitter); 43 MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB, 44 raw_ostream &_OS, MCCodeEmitter *_Emitter, 45 MCAssembler *_Assembler); 46 ~MCObjectStreamer(); 47 getCurrentSectionData()48 MCSectionData *getCurrentSectionData() const { 49 return CurSectionData; 50 } 51 52 MCFragment *getCurrentFragment() const; 53 54 /// Get a data fragment to write into, creating a new one if the current 55 /// fragment is not a data fragment. 56 MCDataFragment *getOrCreateDataFragment() const; 57 58 const MCExpr *AddValueSymbols(const MCExpr *Value); 59 60 public: getAssembler()61 MCAssembler &getAssembler() { return *Assembler; } 62 63 /// @name MCStreamer Interface 64 /// @{ 65 66 virtual void EmitLabel(MCSymbol *Symbol); 67 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size, 68 unsigned AddrSpace); 69 virtual void EmitULEB128Value(const MCExpr *Value); 70 virtual void EmitSLEB128Value(const MCExpr *Value); 71 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol); 72 virtual void ChangeSection(const MCSection *Section); 73 virtual void EmitInstruction(const MCInst &Inst); 74 virtual void EmitInstToFragment(const MCInst &Inst); 75 virtual bool EmitValueToOffset(const MCExpr *Offset, unsigned char Value); 76 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta, 77 const MCSymbol *LastLabel, 78 const MCSymbol *Label, 79 unsigned PointerSize); 80 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel, 81 const MCSymbol *Label); 82 virtual void EmitGPRel32Value(const MCExpr *Value); 83 virtual void FinishImpl(); 84 85 /// @} 86 }; 87 88 } // end namespace llvm 89 90 #endif 91