MCObjectStreamer.h revision 484291c27319668ad99cb87def000254357736fb 
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
36protected:
37  MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB,
38                   raw_ostream &_OS, MCCodeEmitter *_Emitter,
39                   bool _PadSectionToAlignment);
40  ~MCObjectStreamer();
41
42  MCSectionData *getCurrentSectionData() const {
43    return CurSectionData;
44  }
45
46  MCFragment *getCurrentFragment() const;
47
48  /// Get a data fragment to write into, creating a new one if the current
49  /// fragment is not a data fragment.
50  MCDataFragment *getOrCreateDataFragment() const;
51
52  const MCExpr *AddValueSymbols(const MCExpr *Value);
53
54public:
55  MCAssembler &getAssembler() { return *Assembler; }
56
57  /// @name MCStreamer Interface
58  /// @{
59
60  virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
61  virtual void SwitchSection(const MCSection *Section);
62  virtual void Finish();
63
64  /// @}
65};
66
67} // end namespace llvm
68
69#endif
70