MCObjectStreamer.h revision df39be6cb4eb44011db3d3e86f8fe463f81ce127
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/MCAssembler.h" 14#include "llvm/MC/MCStreamer.h" 15 16namespace llvm { 17class MCAssembler; 18class MCCodeEmitter; 19class MCSectionData; 20class MCExpr; 21class MCFragment; 22class MCDataFragment; 23class MCAsmBackend; 24class raw_ostream; 25 26/// \brief Streaming object file generation interface. 27/// 28/// This class provides an implementation of the MCStreamer interface which is 29/// suitable for use with the assembler backend. Specific object file formats 30/// are expected to subclass this interface to implement directives specific 31/// to that file format or custom semantics expected by the object writer 32/// implementation. 33class MCObjectStreamer : public MCStreamer { 34 MCAssembler *Assembler; 35 MCSectionData *CurSectionData; 36 MCSectionData::iterator CurInsertionPoint; 37 38 virtual void EmitInstToData(const MCInst &Inst) = 0; 39 virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame); 40 virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame); 41 42protected: 43 MCObjectStreamer(StreamerKind Kind, MCContext &Context, MCAsmBackend &TAB, 44 raw_ostream &_OS, MCCodeEmitter *_Emitter); 45 MCObjectStreamer(StreamerKind Kind, MCContext &Context, MCAsmBackend &TAB, 46 raw_ostream &_OS, MCCodeEmitter *_Emitter, 47 MCAssembler *_Assembler); 48 ~MCObjectStreamer(); 49 50public: 51 /// state management 52 virtual void reset(); 53 54protected: 55 MCSectionData *getCurrentSectionData() const { 56 return CurSectionData; 57 } 58 59 MCFragment *getCurrentFragment() const; 60 61 void insert(MCFragment *F) const { 62 CurSectionData->getFragmentList().insert(CurInsertionPoint, F); 63 F->setParent(CurSectionData); 64 } 65 66 /// Get a data fragment to write into, creating a new one if the current 67 /// fragment is not a data fragment. 68 MCDataFragment *getOrCreateDataFragment() const; 69 70 const MCExpr *AddValueSymbols(const MCExpr *Value); 71 72public: 73 MCAssembler &getAssembler() { return *Assembler; } 74 75 /// @name MCStreamer Interface 76 /// @{ 77 78 virtual void EmitLabel(MCSymbol *Symbol); 79 virtual void EmitDebugLabel(MCSymbol *Symbol); 80 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value); 81 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size, 82 unsigned AddrSpace); 83 virtual void EmitULEB128Value(const MCExpr *Value); 84 virtual void EmitSLEB128Value(const MCExpr *Value); 85 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol); 86 virtual void ChangeSection(const MCSection *Section, 87 const MCExpr *Subsection); 88 virtual void EmitInstruction(const MCInst &Inst); 89 90 /// \brief Emit an instruction to a special fragment, because this instruction 91 /// can change its size during relaxation. 92 virtual void EmitInstToFragment(const MCInst &Inst); 93 94 virtual void EmitBundleAlignMode(unsigned AlignPow2); 95 virtual void EmitBundleLock(bool AlignToEnd); 96 virtual void EmitBundleUnlock(); 97 virtual void EmitBytes(StringRef Data, unsigned AddrSpace = 0); 98 virtual void EmitValueToAlignment(unsigned ByteAlignment, 99 int64_t Value = 0, 100 unsigned ValueSize = 1, 101 unsigned MaxBytesToEmit = 0); 102 virtual void EmitCodeAlignment(unsigned ByteAlignment, 103 unsigned MaxBytesToEmit = 0); 104 virtual bool EmitValueToOffset(const MCExpr *Offset, unsigned char Value); 105 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta, 106 const MCSymbol *LastLabel, 107 const MCSymbol *Label, 108 unsigned PointerSize); 109 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel, 110 const MCSymbol *Label); 111 virtual void EmitGPRel32Value(const MCExpr *Value); 112 virtual void EmitGPRel64Value(const MCExpr *Value); 113 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue, 114 unsigned AddrSpace = 0); 115 virtual void FinishImpl(); 116 117 /// @} 118 119 static bool classof(const MCStreamer *S) { 120 return S->getKind() >= SK_ELFStreamer && S->getKind() <= SK_WinCOFFStreamer; 121 } 122}; 123 124} // end namespace llvm 125 126#endif 127