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thirdparty/capstone/suite/synctools/tablegen/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h

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+//==- llvm/CodeGen/TargetLoweringObjectFileImpl.h - Object Info --*- C++ -*-==//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements classes used to handle lowerings specific to common
+// object file formats.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
+#define LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
+
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/BinaryFormat/XCOFF.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+
+namespace llvm {
+
+class GlobalValue;
+class MachineModuleInfo;
+class MachineFunction;
+class MCContext;
+class MCExpr;
+class MCSection;
+class MCSymbol;
+class Module;
+class TargetMachine;
+
+class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
+  bool UseInitArray = false;
+  mutable unsigned NextUniqueID = 1;  // ID 0 is reserved for execute-only sections
+  SmallPtrSet<GlobalObject *, 2> Used;
+
+protected:
+  MCSymbolRefExpr::VariantKind PLTRelativeVariantKind =
+      MCSymbolRefExpr::VK_None;
+
+public:
+  TargetLoweringObjectFileELF();
+  ~TargetLoweringObjectFileELF() override = default;
+
+  void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
+
+  void getModuleMetadata(Module &M) override;
+
+  /// Emit Obj-C garbage collection and linker options.
+  void emitModuleMetadata(MCStreamer &Streamer, Module &M) const override;
+
+  void emitPersonalityValue(MCStreamer &Streamer, const DataLayout &DL,
+                            const MCSymbol *Sym) const override;
+
+  /// Given a constant with the SectionKind, return a section that it should be
+  /// placed in.
+  MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
+                                   const Constant *C,
+                                   Align &Alignment) const override;
+
+  MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
+                                      const TargetMachine &TM) const override;
+
+  MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
+                                    const TargetMachine &TM) const override;
+
+  MCSection *getSectionForJumpTable(const Function &F,
+                                    const TargetMachine &TM) const override;
+  MCSection *getSectionForLSDA(const Function &F, const MCSymbol &FnSym,
+                               const TargetMachine &TM) const override;
+
+  MCSection *
+  getSectionForMachineBasicBlock(const Function &F,
+                                 const MachineBasicBlock &MBB,
+                                 const TargetMachine &TM) const override;
+
+  MCSection *
+  getUniqueSectionForFunction(const Function &F,
+                              const TargetMachine &TM) const override;
+
+  bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
+                                           const Function &F) const override;
+
+  /// Return an MCExpr to use for a reference to the specified type info global
+  /// variable from exception handling information.
+  const MCExpr *getTTypeGlobalReference(const GlobalValue *GV,
+                                        unsigned Encoding,
+                                        const TargetMachine &TM,
+                                        MachineModuleInfo *MMI,
+                                        MCStreamer &Streamer) const override;
+
+  // The symbol that gets passed to .cfi_personality.
+  MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV,
+                                    const TargetMachine &TM,
+                                    MachineModuleInfo *MMI) const override;
+
+  void InitializeELF(bool UseInitArray_);
+  MCSection *getStaticCtorSection(unsigned Priority,
+                                  const MCSymbol *KeySym) const override;
+  MCSection *getStaticDtorSection(unsigned Priority,
+                                  const MCSymbol *KeySym) const override;
+
+  const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
+                                       const GlobalValue *RHS,
+                                       const TargetMachine &TM) const override;
+
+  const MCExpr *lowerDSOLocalEquivalent(const DSOLocalEquivalent *Equiv,
+                                        const TargetMachine &TM) const override;
+
+  MCSection *getSectionForCommandLines() const override;
+};
+
+class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
+public:
+  TargetLoweringObjectFileMachO();
+  ~TargetLoweringObjectFileMachO() override = default;
+
+  void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
+
+  /// Emit the module flags that specify the garbage collection information.
+  void emitModuleMetadata(MCStreamer &Streamer, Module &M) const override;
+
+  MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
+                                    const TargetMachine &TM) const override;
+
+  MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
+                                      const TargetMachine &TM) const override;
+
+  MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
+                                   const Constant *C,
+                                   Align &Alignment) const override;
+
+  /// The mach-o version of this method defaults to returning a stub reference.
+  const MCExpr *getTTypeGlobalReference(const GlobalValue *GV,
+                                        unsigned Encoding,
+                                        const TargetMachine &TM,
+                                        MachineModuleInfo *MMI,
+                                        MCStreamer &Streamer) const override;
+
+  // The symbol that gets passed to .cfi_personality.
+  MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV,
+                                    const TargetMachine &TM,
+                                    MachineModuleInfo *MMI) const override;
+
+  /// Get MachO PC relative GOT entry relocation
+  const MCExpr *getIndirectSymViaGOTPCRel(const GlobalValue *GV,
+                                          const MCSymbol *Sym,
+                                          const MCValue &MV, int64_t Offset,
+                                          MachineModuleInfo *MMI,
+                                          MCStreamer &Streamer) const override;
+
+  void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV,
+                         const TargetMachine &TM) const override;
+};
+
+class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
+  mutable unsigned NextUniqueID = 0;
+  const TargetMachine *TM = nullptr;
+
+public:
+  ~TargetLoweringObjectFileCOFF() override = default;
+
+  void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
+  MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
+                                      const TargetMachine &TM) const override;
+
+  MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
+                                    const TargetMachine &TM) const override;
+
+  void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV,
+                         const TargetMachine &TM) const override;
+
+  MCSection *getSectionForJumpTable(const Function &F,
+                                    const TargetMachine &TM) const override;
+
+  /// Emit Obj-C garbage collection and linker options.
+  void emitModuleMetadata(MCStreamer &Streamer, Module &M) const override;
+
+  MCSection *getStaticCtorSection(unsigned Priority,
+                                  const MCSymbol *KeySym) const override;
+  MCSection *getStaticDtorSection(unsigned Priority,
+                                  const MCSymbol *KeySym) const override;
+
+  const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
+                                       const GlobalValue *RHS,
+                                       const TargetMachine &TM) const override;
+
+  /// Given a mergeable constant with the specified size and relocation
+  /// information, return a section that it should be placed in.
+  MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
+                                   const Constant *C,
+                                   Align &Alignment) const override;
+
+private:
+  void emitLinkerDirectives(MCStreamer &Streamer, Module &M) const;
+};
+
+class TargetLoweringObjectFileWasm : public TargetLoweringObjectFile {
+  mutable unsigned NextUniqueID = 0;
+
+public:
+  TargetLoweringObjectFileWasm() = default;
+  ~TargetLoweringObjectFileWasm() override = default;
+
+  MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
+                                      const TargetMachine &TM) const override;
+
+  MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
+                                    const TargetMachine &TM) const override;
+
+  bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
+                                           const Function &F) const override;
+
+  void InitializeWasm();
+  MCSection *getStaticCtorSection(unsigned Priority,
+                                  const MCSymbol *KeySym) const override;
+  MCSection *getStaticDtorSection(unsigned Priority,
+                                  const MCSymbol *KeySym) const override;
+
+  const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
+                                       const GlobalValue *RHS,
+                                       const TargetMachine &TM) const override;
+};
+
+class TargetLoweringObjectFileXCOFF : public TargetLoweringObjectFile {
+public:
+  TargetLoweringObjectFileXCOFF() = default;
+  ~TargetLoweringObjectFileXCOFF() override = default;
+
+  static bool ShouldEmitEHBlock(const MachineFunction *MF);
+  static bool ShouldSetSSPCanaryBitInTB(const MachineFunction *MF);
+
+  static MCSymbol *getEHInfoTableSymbol(const MachineFunction *MF);
+
+  void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
+
+  bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
+                                           const Function &F) const override;
+
+  MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
+                                      const TargetMachine &TM) const override;
+
+  MCSection *getStaticCtorSection(unsigned Priority,
+                                  const MCSymbol *KeySym) const override;
+  MCSection *getStaticDtorSection(unsigned Priority,
+                                  const MCSymbol *KeySym) const override;
+
+  const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
+                                       const GlobalValue *RHS,
+                                       const TargetMachine &TM) const override;
+
+  MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
+                                    const TargetMachine &TM) const override;
+
+  MCSection *getSectionForJumpTable(const Function &F,
+                                    const TargetMachine &TM) const override;
+
+  /// Given a constant with the SectionKind, return a section that it should be
+  /// placed in.
+  MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
+                                   const Constant *C,
+                                   Align &Alignment) const override;
+
+  static XCOFF::StorageClass getStorageClassForGlobal(const GlobalValue *GV);
+
+  MCSection *
+  getSectionForFunctionDescriptor(const Function *F,
+                                  const TargetMachine &TM) const override;
+  MCSection *getSectionForTOCEntry(const MCSymbol *Sym,
+                                   const TargetMachine &TM) const override;
+
+  /// For external functions, this will always return a function descriptor
+  /// csect.
+  MCSection *
+  getSectionForExternalReference(const GlobalObject *GO,
+                                 const TargetMachine &TM) const override;
+
+  /// For functions, this will always return a function descriptor symbol.
+  MCSymbol *getTargetSymbol(const GlobalValue *GV,
+                            const TargetMachine &TM) const override;
+
+  MCSymbol *getFunctionEntryPointSymbol(const GlobalValue *Func,
+                                        const TargetMachine &TM) const override;
+};
+
+class TargetLoweringObjectFileGOFF : public TargetLoweringObjectFile {
+public:
+  TargetLoweringObjectFileGOFF();
+  ~TargetLoweringObjectFileGOFF() override = default;
+
+  MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
+                                    const TargetMachine &TM) const override;
+  MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
+                                      const TargetMachine &TM) const override;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H