MCObjectStreamer.h revision 85f2ecc697a8ca6c8cf08093054cbbb9d2060ccf
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 15namespace llvm { 16class MCAssembler; 17class MCCodeEmitter; 18class MCSectionData; 19class MCExpr; 20class MCFragment; 21class MCDataFragment; 22class TargetAsmBackend; 23class 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. 32class MCObjectStreamer : public MCStreamer { 33 MCAssembler *Assembler; 34 MCSectionData *CurSectionData; 35 36 virtual void EmitInstToData(const MCInst &Inst) = 0; 37 38protected: 39 MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB, 40 raw_ostream &_OS, MCCodeEmitter *_Emitter); 41 ~MCObjectStreamer(); 42 43 MCSectionData *getCurrentSectionData() const { 44 return CurSectionData; 45 } 46 47 MCFragment *getCurrentFragment() const; 48 49 /// Get a data fragment to write into, creating a new one if the current 50 /// fragment is not a data fragment. 51 MCDataFragment *getOrCreateDataFragment() const; 52 53 const MCExpr *AddValueSymbols(const MCExpr *Value); 54 55public: 56 MCAssembler &getAssembler() { return *Assembler; } 57 58 /// @name MCStreamer Interface 59 /// @{ 60 61 virtual void EmitLabel(MCSymbol *Symbol); 62 virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace); 63 virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0); 64 virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0); 65 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol); 66 virtual void SwitchSection(const MCSection *Section); 67 virtual void EmitInstruction(const MCInst &Inst); 68 virtual void EmitInstToFragment(const MCInst &Inst); 69 virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value); 70 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta, 71 const MCSymbol *LastLabel, 72 const MCSymbol *Label); 73 virtual void Finish(); 74 75 /// @} 76}; 77 78} // end namespace llvm 79 80#endif 81