1 //===- MCObjectStreamer.h - MCStreamer Object File Interface ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_MC_MCOBJECTSTREAMER_H
11 #define LLVM_MC_MCOBJECTSTREAMER_H
13 #include "llvm/MC/MCStreamer.h"
22 class TargetAsmBackend;
25 /// \brief Streaming object file generation interface.
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
32 class MCObjectStreamer : public MCStreamer {
33 MCAssembler *Assembler;
34 MCSectionData *CurSectionData;
36 virtual void EmitInstToData(const MCInst &Inst) = 0;
39 MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB,
40 raw_ostream &_OS, MCCodeEmitter *_Emitter);
41 MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB,
42 raw_ostream &_OS, MCCodeEmitter *_Emitter,
43 MCAssembler *_Assembler);
46 MCSectionData *getCurrentSectionData() const {
47 return CurSectionData;
50 MCFragment *getCurrentFragment() const;
52 /// Get a data fragment to write into, creating a new one if the current
53 /// fragment is not a data fragment.
54 MCDataFragment *getOrCreateDataFragment() const;
56 const MCExpr *AddValueSymbols(const MCExpr *Value);
59 MCAssembler &getAssembler() { return *Assembler; }
61 /// @name MCStreamer Interface
64 virtual void EmitLabel(MCSymbol *Symbol);
65 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
66 bool isPCRel, unsigned AddrSpace);
67 virtual void EmitULEB128Value(const MCExpr *Value);
68 virtual void EmitSLEB128Value(const MCExpr *Value);
69 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
70 virtual void ChangeSection(const MCSection *Section);
71 virtual void EmitInstruction(const MCInst &Inst);
72 virtual void EmitInstToFragment(const MCInst &Inst);
73 virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value);
74 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
75 const MCSymbol *LastLabel,
76 const MCSymbol *Label);
77 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
78 const MCSymbol *Label);
79 virtual void Finish();
84 } // end namespace llvm