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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/IR/Module.h"
19 : #include "llvm/MC/MCExpr.h"
20 : #include "llvm/Target/TargetLoweringObjectFile.h"
21 :
22 : namespace llvm {
23 :
24 : class GlobalValue;
25 : class MachineModuleInfo;
26 : class Mangler;
27 : class MCContext;
28 : class MCSection;
29 : class MCSymbol;
30 : class TargetMachine;
31 :
32 : class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
33 : bool UseInitArray = false;
34 : mutable unsigned NextUniqueID = 1; // ID 0 is reserved for execute-only sections
35 :
36 : protected:
37 : MCSymbolRefExpr::VariantKind PLTRelativeVariantKind =
38 : MCSymbolRefExpr::VK_None;
39 : const TargetMachine *TM;
40 :
41 : public:
42 33667 : TargetLoweringObjectFileELF() = default;
43 1078 : ~TargetLoweringObjectFileELF() override = default;
44 :
45 : void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
46 :
47 : /// Emit Obj-C garbage collection and linker options.
48 : void emitModuleMetadata(MCStreamer &Streamer, Module &M) const override;
49 :
50 : void emitPersonalityValue(MCStreamer &Streamer, const DataLayout &DL,
51 : const MCSymbol *Sym) const override;
52 :
53 : /// Given a constant with the SectionKind, return a section that it should be
54 : /// placed in.
55 : MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
56 : const Constant *C,
57 : unsigned &Align) const override;
58 :
59 : MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
60 : const TargetMachine &TM) const override;
61 :
62 : MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
63 : const TargetMachine &TM) const override;
64 :
65 : MCSection *getSectionForJumpTable(const Function &F,
66 : const TargetMachine &TM) const override;
67 :
68 : bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
69 : const Function &F) const override;
70 :
71 : /// Return an MCExpr to use for a reference to the specified type info global
72 : /// variable from exception handling information.
73 : const MCExpr *getTTypeGlobalReference(const GlobalValue *GV,
74 : unsigned Encoding,
75 : const TargetMachine &TM,
76 : MachineModuleInfo *MMI,
77 : MCStreamer &Streamer) const override;
78 :
79 : // The symbol that gets passed to .cfi_personality.
80 : MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV,
81 : const TargetMachine &TM,
82 : MachineModuleInfo *MMI) const override;
83 :
84 : void InitializeELF(bool UseInitArray_);
85 : MCSection *getStaticCtorSection(unsigned Priority,
86 : const MCSymbol *KeySym) const override;
87 : MCSection *getStaticDtorSection(unsigned Priority,
88 : const MCSymbol *KeySym) const override;
89 :
90 : const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
91 : const GlobalValue *RHS,
92 : const TargetMachine &TM) const override;
93 : };
94 :
95 : class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
96 : public:
97 : TargetLoweringObjectFileMachO();
98 1625 : ~TargetLoweringObjectFileMachO() override = default;
99 :
100 : void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
101 :
102 : /// Emit the module flags that specify the garbage collection information.
103 : void emitModuleMetadata(MCStreamer &Streamer, Module &M) const override;
104 :
105 : MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
106 : const TargetMachine &TM) const override;
107 :
108 : MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
109 : const TargetMachine &TM) const override;
110 :
111 : MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
112 : const Constant *C,
113 : unsigned &Align) const override;
114 :
115 : /// The mach-o version of this method defaults to returning a stub reference.
116 : const MCExpr *getTTypeGlobalReference(const GlobalValue *GV,
117 : unsigned Encoding,
118 : const TargetMachine &TM,
119 : MachineModuleInfo *MMI,
120 : MCStreamer &Streamer) const override;
121 :
122 : // The symbol that gets passed to .cfi_personality.
123 : MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV,
124 : const TargetMachine &TM,
125 : MachineModuleInfo *MMI) const override;
126 :
127 : /// Get MachO PC relative GOT entry relocation
128 : const MCExpr *getIndirectSymViaGOTPCRel(const MCSymbol *Sym,
129 : const MCValue &MV, int64_t Offset,
130 : MachineModuleInfo *MMI,
131 : MCStreamer &Streamer) const override;
132 :
133 : void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV,
134 : const TargetMachine &TM) const override;
135 : };
136 :
137 1558 : class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
138 : mutable unsigned NextUniqueID = 0;
139 :
140 : public:
141 1487 : ~TargetLoweringObjectFileCOFF() override = default;
142 :
143 : void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
144 : MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
145 : const TargetMachine &TM) const override;
146 :
147 : MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
148 : const TargetMachine &TM) const override;
149 :
150 : void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV,
151 : const TargetMachine &TM) const override;
152 :
153 : MCSection *getSectionForJumpTable(const Function &F,
154 : const TargetMachine &TM) const override;
155 :
156 : /// Emit Obj-C garbage collection and linker options.
157 : void emitModuleMetadata(MCStreamer &Streamer, Module &M) const override;
158 :
159 : MCSection *getStaticCtorSection(unsigned Priority,
160 : const MCSymbol *KeySym) const override;
161 : MCSection *getStaticDtorSection(unsigned Priority,
162 : const MCSymbol *KeySym) const override;
163 :
164 : void emitLinkerFlagsForGlobal(raw_ostream &OS,
165 : const GlobalValue *GV) const override;
166 :
167 : void emitLinkerFlagsForUsed(raw_ostream &OS,
168 : const GlobalValue *GV) const override;
169 :
170 : const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
171 : const GlobalValue *RHS,
172 : const TargetMachine &TM) const override;
173 :
174 : /// Given a mergeable constant with the specified size and relocation
175 : /// information, return a section that it should be placed in.
176 : MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
177 : const Constant *C,
178 : unsigned &Align) const override;
179 : };
180 :
181 : class TargetLoweringObjectFileWasm : public TargetLoweringObjectFile {
182 : mutable unsigned NextUniqueID = 0;
183 :
184 : public:
185 352 : TargetLoweringObjectFileWasm() = default;
186 0 : ~TargetLoweringObjectFileWasm() override = default;
187 :
188 : MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
189 : const TargetMachine &TM) const override;
190 :
191 : MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
192 : const TargetMachine &TM) const override;
193 :
194 : bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
195 : const Function &F) const override;
196 :
197 : void InitializeWasm();
198 : MCSection *getStaticCtorSection(unsigned Priority,
199 : const MCSymbol *KeySym) const override;
200 : MCSection *getStaticDtorSection(unsigned Priority,
201 : const MCSymbol *KeySym) const override;
202 :
203 : const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
204 : const GlobalValue *RHS,
205 : const TargetMachine &TM) const override;
206 : };
207 :
208 : } // end namespace llvm
209 :
210 : #endif // LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
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