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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/MCAssembler.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;
MCSectionData::iterator CurInsertionPoint;
virtual void EmitInstToData(const MCInst &Inst) = 0;
virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame);
protected:
MCObjectStreamer(StreamerKind Kind, MCContext &Context, MCAsmBackend &TAB,
raw_ostream &_OS, MCCodeEmitter *_Emitter);
MCObjectStreamer(StreamerKind Kind, MCContext &Context, MCAsmBackend &TAB,
raw_ostream &_OS, MCCodeEmitter *_Emitter,
MCAssembler *_Assembler);
~MCObjectStreamer();
public:
/// state management
virtual void reset();
protected:
MCSectionData *getCurrentSectionData() const {
return CurSectionData;
}
MCFragment *getCurrentFragment() const;
void insert(MCFragment *F) const {
CurSectionData->getFragmentList().insert(CurInsertionPoint, F);
F->setParent(CurSectionData);
}
/// 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 EmitDebugLabel(MCSymbol *Symbol);
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
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,
const MCExpr *Subsection);
virtual void EmitInstruction(const MCInst &Inst);
/// \brief Emit an instruction to a special fragment, because this instruction
/// can change its size during relaxation.
virtual void EmitInstToFragment(const MCInst &Inst);
virtual void EmitBundleAlignMode(unsigned AlignPow2);
virtual void EmitBundleLock(bool AlignToEnd);
virtual void EmitBundleUnlock();
virtual void EmitBytes(StringRef Data, unsigned AddrSpace = 0);
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 EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
unsigned Column, unsigned Flags,
unsigned Isa, unsigned Discriminator,
StringRef FileName);
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 = 0);
virtual void FinishImpl();
/// @}
static bool classof(const MCStreamer *S) {
return S->getKind() >= SK_ELFStreamer && S->getKind() <= SK_WinCOFFStreamer;
}
};
} // end namespace llvm
#endif
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