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Diffstat (limited to 'include/llvm/CodeGen/TargetLoweringObjectFile.h')
| -rw-r--r-- | include/llvm/CodeGen/TargetLoweringObjectFile.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/TargetLoweringObjectFile.h b/include/llvm/CodeGen/TargetLoweringObjectFile.h new file mode 100644 index 0000000000000..fe77c2954129f --- /dev/null +++ b/include/llvm/CodeGen/TargetLoweringObjectFile.h @@ -0,0 +1,194 @@ +//===-- llvm/CodeGen/TargetLoweringObjectFile.h - Object Info ---*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements classes used to handle lowerings specific to common +// object file formats. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_CODEGEN_TARGETLOWERINGOBJECTFILE_H +#define LLVM_CODEGEN_TARGETLOWERINGOBJECTFILE_H + +#include "llvm/ADT/ArrayRef.h" +#include "llvm/ADT/StringRef.h" +#include "llvm/IR/Module.h" +#include "llvm/MC/MCObjectFileInfo.h" +#include "llvm/MC/SectionKind.h" +#include <cstdint> + +namespace llvm { + +class GlobalValue; +class MachineModuleInfo; +class Mangler; +class MCContext; +class MCExpr; +class MCSection; +class MCSymbol; +class MCSymbolRefExpr; +class MCStreamer; +class MCValue; +class TargetMachine; + +class TargetLoweringObjectFile : public MCObjectFileInfo { + MCContext *Ctx = nullptr; + + /// Name-mangler for global names. + Mangler *Mang = nullptr; + +protected: + bool SupportIndirectSymViaGOTPCRel = false; + bool SupportGOTPCRelWithOffset = true; + + /// This section contains the static constructor pointer list. + MCSection *StaticCtorSection = nullptr; + + /// This section contains the static destructor pointer list. + MCSection *StaticDtorSection = nullptr; + +public: + TargetLoweringObjectFile() = default; + TargetLoweringObjectFile(const TargetLoweringObjectFile &) = delete; + TargetLoweringObjectFile & + operator=(const TargetLoweringObjectFile &) = delete; + virtual ~TargetLoweringObjectFile(); + + MCContext &getContext() const { return *Ctx; } + Mangler &getMangler() const { return *Mang; } + + /// This method must be called before any actual lowering is done. This + /// specifies the current context for codegen, and gives the lowering + /// implementations a chance to set up their default sections. + virtual void Initialize(MCContext &ctx, const TargetMachine &TM); + + virtual void emitPersonalityValue(MCStreamer &Streamer, const DataLayout &TM, + const MCSymbol *Sym) const; + + /// Emit the module-level metadata that the platform cares about. + virtual void emitModuleMetadata(MCStreamer &Streamer, Module &M, + const TargetMachine &TM) const {} + + /// Given a constant with the SectionKind, return a section that it should be + /// placed in. + virtual MCSection *getSectionForConstant(const DataLayout &DL, + SectionKind Kind, + const Constant *C, + unsigned &Align) const; + + /// Classify the specified global variable into a set of target independent + /// categories embodied in SectionKind. + static SectionKind getKindForGlobal(const GlobalObject *GO, + const TargetMachine &TM); + + /// This method computes the appropriate section to emit the specified global + /// variable or function definition. This should not be passed external (or + /// available externally) globals. + MCSection *SectionForGlobal(const GlobalObject *GO, SectionKind Kind, + const TargetMachine &TM) const; + + /// This method computes the appropriate section to emit the specified global + /// variable or function definition. This should not be passed external (or + /// available externally) globals. + MCSection *SectionForGlobal(const GlobalObject *GO, + const TargetMachine &TM) const { + return SectionForGlobal(GO, getKindForGlobal(GO, TM), TM); + } + + virtual void getNameWithPrefix(SmallVectorImpl<char> &OutName, + const GlobalValue *GV, + const TargetMachine &TM) const; + + virtual MCSection *getSectionForJumpTable(const Function &F, + const TargetMachine &TM) const; + + virtual bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference, + const Function &F) const; + + /// Targets should implement this method to assign a section to globals with + /// an explicit section specfied. The implementation of this method can + /// assume that GO->hasSection() is true. + virtual MCSection * + getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind, + const TargetMachine &TM) const = 0; + + /// Return an MCExpr to use for a reference to the specified global variable + /// from exception handling information. + virtual const MCExpr *getTTypeGlobalReference(const GlobalValue *GV, + unsigned Encoding, + const TargetMachine &TM, + MachineModuleInfo *MMI, + MCStreamer &Streamer) const; + + /// Return the MCSymbol for a private symbol with global value name as its + /// base, with the specified suffix. + MCSymbol *getSymbolWithGlobalValueBase(const GlobalValue *GV, + StringRef Suffix, + const TargetMachine &TM) const; + + // The symbol that gets passed to .cfi_personality. + virtual MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV, + const TargetMachine &TM, + MachineModuleInfo *MMI) const; + + const MCExpr *getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding, + MCStreamer &Streamer) const; + + virtual MCSection *getStaticCtorSection(unsigned Priority, + const MCSymbol *KeySym) const { + return StaticCtorSection; + } + + virtual MCSection *getStaticDtorSection(unsigned Priority, + const MCSymbol *KeySym) const { + return StaticDtorSection; + } + + /// \brief Create a symbol reference to describe the given TLS variable when + /// emitting the address in debug info. + virtual const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const; + + virtual const MCExpr *lowerRelativeReference(const GlobalValue *LHS, + const GlobalValue *RHS, + const TargetMachine &TM) const { + return nullptr; + } + + /// \brief Target supports replacing a data "PC"-relative access to a symbol + /// through another symbol, by accessing the later via a GOT entry instead? + bool supportIndirectSymViaGOTPCRel() const { + return SupportIndirectSymViaGOTPCRel; + } + + /// \brief Target GOT "PC"-relative relocation supports encoding an additional + /// binary expression with an offset? + bool supportGOTPCRelWithOffset() const { + return SupportGOTPCRelWithOffset; + } + + /// \brief Get the target specific PC relative GOT entry relocation + virtual const MCExpr *getIndirectSymViaGOTPCRel(const MCSymbol *Sym, + const MCValue &MV, + int64_t Offset, + MachineModuleInfo *MMI, + MCStreamer &Streamer) const { + return nullptr; + } + + virtual void emitLinkerFlagsForGlobal(raw_ostream &OS, + const GlobalValue *GV) const {} + +protected: + virtual MCSection *SelectSectionForGlobal(const GlobalObject *GO, + SectionKind Kind, + const TargetMachine &TM) const = 0; +}; + +} // end namespace llvm + +#endif // LLVM_CODEGEN_TARGETLOWERINGOBJECTFILE_H |