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/ADT/StringRef.h"
19 #include "llvm/MC/SectionKind.h"
20 #include "llvm/Target/TargetLoweringObjectFile.h"
21 
22 namespace 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 
35 class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
36   bool UseInitArray;
37 
38 public:
~TargetLoweringObjectFileELF()39   virtual ~TargetLoweringObjectFileELF() {}
40 
41   void emitPersonalityValue(MCStreamer &Streamer, const TargetMachine &TM,
42                             const MCSymbol *Sym) const override;
43 
44   /// Given a constant with the SectionKind, return a section that it should be
45   /// placed in.
46   const MCSection *getSectionForConstant(SectionKind Kind,
47                                          const Constant *C) const override;
48 
49   const MCSection *getExplicitSectionGlobal(const GlobalValue *GV,
50                                         SectionKind Kind, Mangler &Mang,
51                                         const TargetMachine &TM) const override;
52 
53   const MCSection *SelectSectionForGlobal(const GlobalValue *GV,
54                                         SectionKind Kind, Mangler &Mang,
55                                         const TargetMachine &TM) const override;
56 
57   /// Return an MCExpr to use for a reference to the specified type info global
58   /// variable from exception handling information.
59   const MCExpr *
60   getTTypeGlobalReference(const GlobalValue *GV, unsigned Encoding,
61                           Mangler &Mang, const TargetMachine &TM,
62                           MachineModuleInfo *MMI,
63                           MCStreamer &Streamer) const override;
64 
65   // The symbol that gets passed to .cfi_personality.
66   MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV, Mangler &Mang,
67                                     const TargetMachine &TM,
68                                     MachineModuleInfo *MMI) const override;
69 
70   void InitializeELF(bool UseInitArray_);
71   const MCSection *getStaticCtorSection(unsigned Priority,
72                                         const MCSymbol *KeySym) const override;
73   const MCSection *getStaticDtorSection(unsigned Priority,
74                                         const MCSymbol *KeySym) const override;
75 };
76 
77 
78 
79 class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
80 public:
~TargetLoweringObjectFileMachO()81   virtual ~TargetLoweringObjectFileMachO() {}
82 
83   /// Extract the dependent library name from a linker option string. Returns
84   /// StringRef() if the option does not specify a library.
85   StringRef getDepLibFromLinkerOpt(StringRef LinkerOption) const override;
86 
87   /// Emit the module flags that specify the garbage collection information.
88   void emitModuleFlags(MCStreamer &Streamer,
89                        ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
90                        Mangler &Mang, const TargetMachine &TM) const override;
91 
92   const MCSection *
93     SelectSectionForGlobal(const GlobalValue *GV,
94                            SectionKind Kind, Mangler &Mang,
95                            const TargetMachine &TM) const override;
96 
97   const MCSection *
98     getExplicitSectionGlobal(const GlobalValue *GV,
99                              SectionKind Kind, Mangler &Mang,
100                              const TargetMachine &TM) const override;
101 
102   const MCSection *getSectionForConstant(SectionKind Kind,
103                                          const Constant *C) const override;
104 
105   /// The mach-o version of this method defaults to returning a stub reference.
106   const MCExpr *
107   getTTypeGlobalReference(const GlobalValue *GV, unsigned Encoding,
108                           Mangler &Mang, const TargetMachine &TM,
109                           MachineModuleInfo *MMI,
110                           MCStreamer &Streamer) const override;
111 
112   // The symbol that gets passed to .cfi_personality.
113   MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV, Mangler &Mang,
114                                     const TargetMachine &TM,
115                                     MachineModuleInfo *MMI) const override;
116 };
117 
118 
119 
120 class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
121 public:
~TargetLoweringObjectFileCOFF()122   virtual ~TargetLoweringObjectFileCOFF() {}
123 
124   const MCSection *
125     getExplicitSectionGlobal(const GlobalValue *GV,
126                              SectionKind Kind, Mangler &Mang,
127                              const TargetMachine &TM) const override;
128 
129   const MCSection *
130     SelectSectionForGlobal(const GlobalValue *GV,
131                            SectionKind Kind, Mangler &Mang,
132                            const TargetMachine &TM) const override;
133 
134   /// Extract the dependent library name from a linker option string. Returns
135   /// StringRef() if the option does not specify a library.
136   StringRef getDepLibFromLinkerOpt(StringRef LinkerOption) const override;
137 
138   /// Emit Obj-C garbage collection and linker options. Only linker option
139   /// emission is implemented for COFF.
140   void emitModuleFlags(MCStreamer &Streamer,
141                        ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
142                        Mangler &Mang, const TargetMachine &TM) const override;
143 
144   const MCSection *getStaticCtorSection(unsigned Priority,
145                                         const MCSymbol *KeySym) const override;
146   const MCSection *getStaticDtorSection(unsigned Priority,
147                                         const MCSymbol *KeySym) const override;
148 };
149 
150 } // end namespace llvm
151 
152 #endif
153