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"
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;
37 virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
38 virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame);
41 MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
42 raw_ostream &_OS, MCCodeEmitter *_Emitter);
43 MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
44 raw_ostream &_OS, MCCodeEmitter *_Emitter,
45 MCAssembler *_Assembler);
48 MCSectionData *getCurrentSectionData() const {
49 return CurSectionData;
52 MCFragment *getCurrentFragment() const;
54 /// Get a data fragment to write into, creating a new one if the current
55 /// fragment is not a data fragment.
56 MCDataFragment *getOrCreateDataFragment() const;
58 const MCExpr *AddValueSymbols(const MCExpr *Value);
61 MCAssembler &getAssembler() { return *Assembler; }
63 /// @name MCStreamer Interface
66 virtual void EmitLabel(MCSymbol *Symbol);
67 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
69 virtual void EmitULEB128Value(const MCExpr *Value);
70 virtual void EmitSLEB128Value(const MCExpr *Value);
71 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
72 virtual void ChangeSection(const MCSection *Section);
73 virtual void EmitInstruction(const MCInst &Inst);
74 virtual void EmitInstToFragment(const MCInst &Inst);
75 virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
76 virtual void EmitValueToAlignment(unsigned ByteAlignment,
78 unsigned ValueSize = 1,
79 unsigned MaxBytesToEmit = 0);
80 virtual void EmitCodeAlignment(unsigned ByteAlignment,
81 unsigned MaxBytesToEmit = 0);
82 virtual bool EmitValueToOffset(const MCExpr *Offset, unsigned char Value);
83 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
84 const MCSymbol *LastLabel,
85 const MCSymbol *Label,
86 unsigned PointerSize);
87 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
88 const MCSymbol *Label);
89 virtual void EmitGPRel32Value(const MCExpr *Value);
90 virtual void EmitGPRel64Value(const MCExpr *Value);
91 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
93 virtual void FinishImpl();
98 } // end namespace llvm