include/llvm/CodeGen/TargetLoweringObjectFileImpl.h

   1 //==- llvm/CodeGen/TargetLoweringObjectFileImpl.h - Object Info --*- C++ -*-==//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements classes used to handle lowerings specific to common
  10 // object file formats.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
  15 #define LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
  16
  17 #include "llvm/BinaryFormat/XCOFF.h"
  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 = nullptr;
  40
  41 public:
  42   TargetLoweringObjectFileELF() = default;
  43   ~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   MCSection *getSectionForCommandLines() const override;
  95 };
  96
  97 class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
  98 public:
  99   TargetLoweringObjectFileMachO();
 100   ~TargetLoweringObjectFileMachO() override = default;
 101
 102   void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
 103
 104   /// Emit the module flags that specify the garbage collection information.
 105   void emitModuleMetadata(MCStreamer &Streamer, Module &M) const override;
 106
 107   MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
 108                                     const TargetMachine &TM) const override;
 109
 110   MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
 111                                       const TargetMachine &TM) const override;
 112
 113   MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
 114                                    const Constant *C,
 115                                    unsigned &Align) const override;
 116
 117   /// The mach-o version of this method defaults to returning a stub reference.
 118   const MCExpr *getTTypeGlobalReference(const GlobalValue *GV,
 119                                         unsigned Encoding,
 120                                         const TargetMachine &TM,
 121                                         MachineModuleInfo *MMI,
 122                                         MCStreamer &Streamer) const override;
 123
 124   // The symbol that gets passed to .cfi_personality.
 125   MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV,
 126                                     const TargetMachine &TM,
 127                                     MachineModuleInfo *MMI) const override;
 128
 129   /// Get MachO PC relative GOT entry relocation
 130   const MCExpr *getIndirectSymViaGOTPCRel(const GlobalValue *GV,
 131                                           const MCSymbol *Sym,
 132                                           const MCValue &MV, int64_t Offset,
 133                                           MachineModuleInfo *MMI,
 134                                           MCStreamer &Streamer) const override;
 135
 136   void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV,
 137                          const TargetMachine &TM) const override;
 138 };
 139
 140 class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
 141   mutable unsigned NextUniqueID = 0;
 142
 143 public:
 144   ~TargetLoweringObjectFileCOFF() override = default;
 145
 146   void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
 147   MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
 148                                       const TargetMachine &TM) const override;
 149
 150   MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
 151                                     const TargetMachine &TM) const override;
 152
 153   void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV,
 154                          const TargetMachine &TM) const override;
 155
 156   MCSection *getSectionForJumpTable(const Function &F,
 157                                     const TargetMachine &TM) const override;
 158
 159   /// Emit Obj-C garbage collection and linker options.
 160   void emitModuleMetadata(MCStreamer &Streamer, Module &M) const override;
 161
 162   MCSection *getStaticCtorSection(unsigned Priority,
 163                                   const MCSymbol *KeySym) const override;
 164   MCSection *getStaticDtorSection(unsigned Priority,
 165                                   const MCSymbol *KeySym) const override;
 166
 167   void emitLinkerFlagsForGlobal(raw_ostream &OS,
 168                                 const GlobalValue *GV) const override;
 169
 170   void emitLinkerFlagsForUsed(raw_ostream &OS,
 171                               const GlobalValue *GV) const override;
 172
 173   const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
 174                                        const GlobalValue *RHS,
 175                                        const TargetMachine &TM) const override;
 176
 177   /// Given a mergeable constant with the specified size and relocation
 178   /// information, return a section that it should be placed in.
 179   MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
 180                                    const Constant *C,
 181                                    unsigned &Align) const override;
 182 };
 183
 184 class TargetLoweringObjectFileWasm : public TargetLoweringObjectFile {
 185   mutable unsigned NextUniqueID = 0;
 186
 187 public:
 188   TargetLoweringObjectFileWasm() = default;
 189   ~TargetLoweringObjectFileWasm() override = default;
 190
 191   MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
 192                                       const TargetMachine &TM) const override;
 193
 194   MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
 195                                     const TargetMachine &TM) const override;
 196
 197   bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
 198                                            const Function &F) const override;
 199
 200   void InitializeWasm();
 201   MCSection *getStaticCtorSection(unsigned Priority,
 202                                   const MCSymbol *KeySym) const override;
 203   MCSection *getStaticDtorSection(unsigned Priority,
 204                                   const MCSymbol *KeySym) const override;
 205
 206   const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
 207                                        const GlobalValue *RHS,
 208                                        const TargetMachine &TM) const override;
 209 };
 210
 211 class TargetLoweringObjectFileXCOFF : public TargetLoweringObjectFile {
 212 public:
 213   TargetLoweringObjectFileXCOFF() = default;
 214   ~TargetLoweringObjectFileXCOFF() override = default;
 215
 216   void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
 217
 218   bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
 219                                            const Function &F) const override;
 220
 221   MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
 222                                       const TargetMachine &TM) const override;
 223
 224   MCSection *getStaticCtorSection(unsigned Priority,
 225                                   const MCSymbol *KeySym) const override;
 226   MCSection *getStaticDtorSection(unsigned Priority,
 227                                   const MCSymbol *KeySym) const override;
 228
 229   const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
 230                                        const GlobalValue *RHS,
 231                                        const TargetMachine &TM) const override;
 232
 233   MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
 234                                     const TargetMachine &TM) const override;
 235
 236   static XCOFF::StorageClass getStorageClassForGlobal(const GlobalObject *GO);
 237 };
 238
 239 } // end namespace llvm
 240
 241 #endif // LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H