llvm-6502/include/llvm/MC/MCObjectStreamer.h
2011-02-16 01:08:29 +00:00

84 lines
2.8 KiB
C++

//===- MCObjectStreamer.h - MCStreamer Object File Interface ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCOBJECTSTREAMER_H
#define LLVM_MC_MCOBJECTSTREAMER_H
#include "llvm/MC/MCStreamer.h"
namespace llvm {
class MCAssembler;
class MCCodeEmitter;
class MCSectionData;
class MCExpr;
class MCFragment;
class MCDataFragment;
class TargetAsmBackend;
class raw_ostream;
/// \brief Streaming object file generation interface.
///
/// This class provides an implementation of the MCStreamer interface which is
/// suitable for use with the assembler backend. Specific object file formats
/// are expected to subclass this interface to implement directives specific
/// to that file format or custom semantics expected by the object writer
/// implementation.
class MCObjectStreamer : public MCStreamer {
MCAssembler *Assembler;
MCSectionData *CurSectionData;
virtual void EmitInstToData(const MCInst &Inst) = 0;
protected:
MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB,
raw_ostream &_OS, MCCodeEmitter *_Emitter);
~MCObjectStreamer();
MCSectionData *getCurrentSectionData() const {
return CurSectionData;
}
MCFragment *getCurrentFragment() const;
/// Get a data fragment to write into, creating a new one if the current
/// fragment is not a data fragment.
MCDataFragment *getOrCreateDataFragment() const;
const MCExpr *AddValueSymbols(const MCExpr *Value);
public:
MCAssembler &getAssembler() { return *Assembler; }
/// @name MCStreamer Interface
/// @{
virtual void EmitLabel(MCSymbol *Symbol);
virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
bool isPCRel, unsigned AddrSpace);
virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
virtual void ChangeSection(const MCSection *Section);
virtual void EmitInstruction(const MCInst &Inst);
virtual void EmitInstToFragment(const MCInst &Inst);
virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value);
virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
const MCSymbol *LastLabel,
const MCSymbol *Label);
virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
const MCSymbol *Label);
virtual void Finish();
/// @}
};
} // end namespace llvm
#endif