MCELFStreamer.h revision 58a2cbef4aac9ee7d530dfb690c78d6fc11a2371 
1//===- MCELFStreamer.h - MCStreamer ELF 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_MCELFSTREAMER_H
11#define LLVM_MC_MCELFSTREAMER_H
12
13#include "llvm/ADT/SmallPtrSet.h"
14#include "llvm/MC/MCDirectives.h"
15#include "llvm/MC/MCObjectStreamer.h"
16#include "llvm/MC/SectionKind.h"
17#include "llvm/Support/DataTypes.h"
18#include <vector>
19
20namespace llvm {
21class MCAsmBackend;
22class MCAssembler;
23class MCCodeEmitter;
24class MCExpr;
25class MCInst;
26class MCSymbol;
27class MCSymbolData;
28class raw_ostream;
29
30class MCELFStreamer : public MCObjectStreamer {
31public:
32  MCELFStreamer(MCContext &Context, MCAsmBackend &TAB,
33                raw_ostream &OS, MCCodeEmitter *Emitter)
34    : MCObjectStreamer(Context, TAB, OS, Emitter) {}
35
36  MCELFStreamer(MCContext &Context, MCAsmBackend &TAB,
37                raw_ostream &OS, MCCodeEmitter *Emitter,
38                MCAssembler *Assembler)
39    : MCObjectStreamer(Context, TAB, OS, Emitter, Assembler) {}
40
41  virtual ~MCELFStreamer();
42
43  /// @name MCStreamer Interface
44  /// @{
45
46  virtual void InitSections();
47  virtual void ChangeSection(const MCSection *Section);
48  virtual void EmitLabel(MCSymbol *Symbol);
49  virtual void EmitDebugLabel(MCSymbol *Symbol);
50  virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
51  virtual void EmitThumbFunc(MCSymbol *Func);
52  virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
53  virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
54  virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
55  virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
56                                unsigned ByteAlignment);
57  virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
58  virtual void EmitCOFFSymbolStorageClass(int StorageClass);
59  virtual void EmitCOFFSymbolType(int Type);
60  virtual void EndCOFFSymbolDef();
61
62  virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
63
64  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
65                                     unsigned ByteAlignment);
66
67  virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
68                            uint64_t Size = 0, unsigned ByteAlignment = 0);
69  virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
70                              uint64_t Size, unsigned ByteAlignment = 0);
71  virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
72                             unsigned AddrSpace);
73
74  virtual void EmitFileDirective(StringRef Filename);
75
76  virtual void EmitTCEntry(const MCSymbol &S);
77
78  virtual void EmitValueToAlignment(unsigned, int64_t, unsigned, unsigned);
79
80  virtual void FinishImpl();
81  /// @}
82
83private:
84  virtual void EmitInstToFragment(const MCInst &Inst);
85  virtual void EmitInstToData(const MCInst &Inst);
86
87  virtual void EmitBundleAlignMode(unsigned AlignPow2);
88  virtual void EmitBundleLock();
89  virtual void EmitBundleUnlock();
90
91  void fixSymbolsInTLSFixups(const MCExpr *expr);
92
93  struct LocalCommon {
94    MCSymbolData *SD;
95    uint64_t Size;
96    unsigned ByteAlignment;
97  };
98
99  std::vector<LocalCommon> LocalCommons;
100
101  SmallPtrSet<MCSymbol *, 16> BindingExplicitlySet;
102
103
104  void SetSection(StringRef Section, unsigned Type, unsigned Flags,
105                  SectionKind Kind);
106  void SetSectionData();
107  void SetSectionText();
108  void SetSectionBss();
109};
110
111} // end namespace llvm
112
113#endif
114