MCObjectStreamer.h revision e23930543c0de0adcfec00cd18e9243ad812a167
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 bool _PadSectionToAlignment); 42 ~MCObjectStreamer(); 43 44 MCSectionData *getCurrentSectionData() const { 45 return CurSectionData; 46 } 47 48 MCFragment *getCurrentFragment() const; 49 50 /// Get a data fragment to write into, creating a new one if the current 51 /// fragment is not a data fragment. 52 MCDataFragment *getOrCreateDataFragment() const; 53 54 const MCExpr *AddValueSymbols(const MCExpr *Value); 55 56public: 57 MCAssembler &getAssembler() { return *Assembler; } 58 59 /// @name MCStreamer Interface 60 /// @{ 61 62 virtual void EmitLabel(MCSymbol *Symbol); 63 virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace); 64 virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0); 65 virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0); 66 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol); 67 virtual void SwitchSection(const MCSection *Section); 68 virtual void EmitInstruction(const MCInst &Inst); 69 virtual void EmitInstToFragment(const MCInst &Inst); 70 virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value); 71 virtual void Finish(); 72 73 /// @} 74}; 75 76} // end namespace llvm 77 78#endif 79