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//===- 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 MCAsmBackend;
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;
virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame);
protected:
MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
raw_ostream &_OS, MCCodeEmitter *_Emitter);
MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
raw_ostream &_OS, MCCodeEmitter *_Emitter,
MCAssembler *_Assembler);
~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,
unsigned AddrSpace);
virtual void EmitULEB128Value(const MCExpr *Value);
virtual void EmitSLEB128Value(const MCExpr *Value);
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 EmitBytes(StringRef Data, unsigned AddrSpace);
virtual void EmitValueToAlignment(unsigned ByteAlignment,
int64_t Value = 0,
unsigned ValueSize = 1,
unsigned MaxBytesToEmit = 0);
virtual void EmitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit = 0);
virtual bool EmitValueToOffset(const MCExpr *Offset, unsigned char Value);
virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
const MCSymbol *LastLabel,
const MCSymbol *Label,
unsigned PointerSize);
virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
const MCSymbol *Label);
virtual void EmitGPRel32Value(const MCExpr *Value);
virtual void EmitGPRel64Value(const MCExpr *Value);
virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
unsigned AddrSpace);
virtual void FinishImpl();
/// @}
};
} // end namespace llvm
#endif
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