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);
43 MCSectionData *getCurrentSectionData() const {
44 return CurSectionData;
47 MCFragment *getCurrentFragment() const;
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;
53 const MCExpr *AddValueSymbols(const MCExpr *Value);
56 MCAssembler &getAssembler() { return *Assembler; }
58 /// @name MCStreamer Interface
61 virtual void EmitLabel(MCSymbol *Symbol);
62 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
63 bool isPCRel, 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 ChangeSection(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 EmitDwarfAdvanceLineAddr(int64_t LineDelta,
72 const MCSymbol *LastLabel,
73 const MCSymbol *Label);
74 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
75 const MCSymbol *Label);
76 virtual void Finish();
81 } // end namespace llvm