MCObjectStreamer.h revision e23930543c0de0adcfec00cd18e9243ad812a167
1//===- MCObjectStreamer.h - MCStreamer Object File Interface ----*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef LLVM_MC_MCOBJECTSTREAMER_H
11#define LLVM_MC_MCOBJECTSTREAMER_H
12
13#include "llvm/MC/MCStreamer.h"
14
15namespace llvm {
16class MCAssembler;
17class MCCodeEmitter;
18class MCSectionData;
19class MCExpr;
20class MCFragment;
21class MCDataFragment;
22class TargetAsmBackend;
23class raw_ostream;
24
25/// \brief Streaming object file generation interface.
26///
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
31/// implementation.
32class MCObjectStreamer : public MCStreamer {
33  MCAssembler *Assembler;
34  MCSectionData *CurSectionData;
35
36  virtual void EmitInstToData(const MCInst &Inst) = 0;
37
38protected:
39  MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB,
40                   raw_ostream &_OS, MCCodeEmitter *_Emitter,
41                   bool _PadSectionToAlignment);
42  ~MCObjectStreamer();
43
44  MCSectionData *getCurrentSectionData() const {
45    return CurSectionData;
46  }
47
48  MCFragment *getCurrentFragment() const;
49
50  /// Get a data fragment to write into, creating a new one if the current
51  /// fragment is not a data fragment.
52  MCDataFragment *getOrCreateDataFragment() const;
53
54  const MCExpr *AddValueSymbols(const MCExpr *Value);
55
56public:
57  MCAssembler &getAssembler() { return *Assembler; }
58
59  /// @name MCStreamer Interface
60  /// @{
61
62  virtual void EmitLabel(MCSymbol *Symbol);
63  virtual void EmitValue(const MCExpr *Value, unsigned Size,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 SwitchSection(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 Finish();
72
73  /// @}
74};
75
76} // end namespace llvm
77
78#endif
79