TargetLoweringObjectFileImpl.h revision d6b43a317e71246380db55a50b799b062b53cdce 
1//==-- llvm/CodeGen/TargetLoweringObjectFileImpl.h - Object Info -*- 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// This file implements classes used to handle lowerings specific to common
11// object file formats.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
16#define LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
17
18#include "llvm/MC/SectionKind.h"
19#include "llvm/Target/TargetLoweringObjectFile.h"
20#include "llvm/ADT/StringRef.h"
21
22namespace llvm {
23  class MachineModuleInfo;
24  class Mangler;
25  class MCAsmInfo;
26  class MCExpr;
27  class MCSection;
28  class MCSectionMachO;
29  class MCSymbol;
30  class MCContext;
31  class GlobalValue;
32  class TargetMachine;
33
34
35class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
36  bool UseInitArray;
37
38public:
39  virtual ~TargetLoweringObjectFileELF() {}
40
41  virtual void emitPersonalityValue(MCStreamer &Streamer,
42                                    const TargetMachine &TM,
43                                    const MCSymbol *Sym) const;
44
45  /// getSectionForConstant - Given a constant with the SectionKind, return a
46  /// section that it should be placed in.
47  virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
48
49
50  virtual const MCSection *
51  getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
52                           Mangler *Mang, const TargetMachine &TM) const;
53
54  virtual const MCSection *
55  SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
56                         Mangler *Mang, const TargetMachine &TM) const;
57
58  /// getExprForDwarfGlobalReference - Return an MCExpr to use for a reference
59  /// to the specified global variable from exception handling information.
60  ///
61  virtual const MCExpr *
62  getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
63                                 MachineModuleInfo *MMI, unsigned Encoding,
64                                 MCStreamer &Streamer) const;
65
66  // getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
67  virtual MCSymbol *
68  getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
69                          MachineModuleInfo *MMI) const;
70
71  void InitializeELF(bool UseInitArray_);
72  virtual const MCSection *
73  getStaticCtorSection(unsigned Priority = 65535) const;
74  virtual const MCSection *
75  getStaticDtorSection(unsigned Priority = 65535) const;
76};
77
78
79
80class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
81public:
82  virtual ~TargetLoweringObjectFileMachO() {}
83
84  /// emitModuleFlags - Emit the module flags that specify the garbage
85  /// collection information.
86  virtual void emitModuleFlags(MCStreamer &Streamer,
87                               ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
88                               Mangler *Mang, const TargetMachine &TM) const;
89
90  virtual const MCSection *
91  SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
92                         Mangler *Mang, const TargetMachine &TM) const;
93
94  virtual const MCSection *
95  getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
96                           Mangler *Mang, const TargetMachine &TM) const;
97
98  virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
99
100  /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
101  /// decide not to emit the UsedDirective for some symbols in llvm.used.
102  /// FIXME: REMOVE this (rdar://7071300)
103  virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
104                                          Mangler *) const;
105
106  /// getExprForDwarfGlobalReference - The mach-o version of this method
107  /// defaults to returning a stub reference.
108  virtual const MCExpr *
109  getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
110                                 MachineModuleInfo *MMI, unsigned Encoding,
111                                 MCStreamer &Streamer) const;
112
113  // getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
114  virtual MCSymbol *
115  getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
116                          MachineModuleInfo *MMI) const;
117};
118
119
120
121class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
122public:
123  virtual ~TargetLoweringObjectFileCOFF() {}
124
125  virtual const MCSection *
126  getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
127                           Mangler *Mang, const TargetMachine &TM) const;
128
129  virtual const MCSection *
130  SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
131                         Mangler *Mang, const TargetMachine &TM) const;
132};
133
134} // end namespace llvm
135
136#endif
137