MCELFStreamer.h revision 263508 
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, MCTargetStreamer *TargetStreamer,
33                MCAsmBackend &TAB, raw_ostream &OS, MCCodeEmitter *Emitter)
34      : MCObjectStreamer(Context, TargetStreamer, TAB, OS, Emitter),
35                         SeenIdent(false) {}
36
37  MCELFStreamer(MCContext &Context, MCTargetStreamer *TargetStreamer,
38                MCAsmBackend &TAB, raw_ostream &OS, MCCodeEmitter *Emitter,
39                MCAssembler *Assembler)
40      : MCObjectStreamer(Context, TargetStreamer, TAB, OS, Emitter, Assembler),
41                         SeenIdent(false) {}
42
43  virtual ~MCELFStreamer();
44
45  /// @name MCStreamer Interface
46  /// @{
47
48  virtual void InitSections();
49  virtual void InitToTextSection();
50  virtual void ChangeSection(const MCSection *Section,
51                             const MCExpr *Subsection);
52  virtual void EmitLabel(MCSymbol *Symbol);
53  virtual void EmitDebugLabel(MCSymbol *Symbol);
54  virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
55  virtual void EmitThumbFunc(MCSymbol *Func);
56  virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
57  virtual bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
58  virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
59  virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
60                                unsigned ByteAlignment);
61  virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
62  virtual void EmitCOFFSymbolStorageClass(int StorageClass);
63  virtual void EmitCOFFSymbolType(int Type);
64  virtual void EndCOFFSymbolDef();
65
66  virtual MCSymbolData &getOrCreateSymbolData(MCSymbol *Symbol);
67
68  virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
69
70  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
71                                     unsigned ByteAlignment);
72
73  virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
74                            uint64_t Size = 0, unsigned ByteAlignment = 0);
75  virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
76                              uint64_t Size, unsigned ByteAlignment = 0);
77  virtual void EmitValueImpl(const MCExpr *Value, unsigned Size);
78
79  virtual void EmitFileDirective(StringRef Filename);
80
81  virtual void EmitIdent(StringRef IdentString);
82
83  virtual void EmitValueToAlignment(unsigned, int64_t, unsigned, unsigned);
84
85  virtual void Flush();
86
87  virtual void FinishImpl();
88
89private:
90  virtual void EmitInstToFragment(const MCInst &Inst);
91  virtual void EmitInstToData(const MCInst &Inst);
92
93  virtual void EmitBundleAlignMode(unsigned AlignPow2);
94  virtual void EmitBundleLock(bool AlignToEnd);
95  virtual void EmitBundleUnlock();
96
97  void fixSymbolsInTLSFixups(const MCExpr *expr);
98
99  bool SeenIdent;
100
101  struct LocalCommon {
102    MCSymbolData *SD;
103    uint64_t Size;
104    unsigned ByteAlignment;
105  };
106
107  std::vector<LocalCommon> LocalCommons;
108
109  SmallPtrSet<MCSymbol *, 16> BindingExplicitlySet;
110
111
112  void SetSection(StringRef Section, unsigned Type, unsigned Flags,
113                  SectionKind Kind);
114  void SetSectionData();
115  void SetSectionText();
116  void SetSectionBss();
117};
118
119MCELFStreamer *createARMELFStreamer(MCContext &Context, MCAsmBackend &TAB,
120                                    raw_ostream &OS, MCCodeEmitter *Emitter,
121                                    bool RelaxAll, bool NoExecStack,
122                                    bool IsThumb);
123
124} // end namespace llvm
125
126#endif
127