1 //===-- Nios2AsmBackend.h - Nios2 Asm Backend ----------------------------===// 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 defines the Nios2AsmBackend class. 11 // 12 //===----------------------------------------------------------------------===// 13 // 14 15 #ifndef LLVM_LIB_TARGET_NIOS2_MCTARGETDESC_NIOS2ASMBACKEND_H 16 #define LLVM_LIB_TARGET_NIOS2_MCTARGETDESC_NIOS2ASMBACKEND_H 17 18 #include "MCTargetDesc/Nios2FixupKinds.h" 19 #include "llvm/ADT/Triple.h" 20 #include "llvm/MC/MCAsmBackend.h" 21 22 namespace llvm { 23 24 class MCAssembler; 25 struct MCFixupKindInfo; 26 class Target; 27 class MCObjectWriter; 28 29 class Nios2AsmBackend : public MCAsmBackend { 30 Triple::OSType OSType; 31 32 public: Nios2AsmBackend(const Target & T,Triple::OSType OSType)33 Nios2AsmBackend(const Target &T, Triple::OSType OSType) 34 : MCAsmBackend(support::little), OSType(OSType) {} 35 36 std::unique_ptr<MCObjectTargetWriter> 37 createObjectTargetWriter() const override; 38 39 bool writeNopData(raw_ostream &OS, uint64_t Count) const override; 40 41 void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup, 42 const MCValue &Target, MutableArrayRef<char> Data, 43 uint64_t Value, bool IsResolved) const override; 44 45 Optional<MCFixupKind> getFixupKind(StringRef Name) const override; 46 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override; 47 getNumFixupKinds()48 unsigned getNumFixupKinds() const override { 49 return Nios2::NumTargetFixupKinds; 50 } 51 52 /// MayNeedRelaxation - Check whether the given instruction may need 53 /// relaxation. 54 /// 55 /// \param Inst - The instruction to test. mayNeedRelaxation(const MCInst & Inst)56 bool mayNeedRelaxation(const MCInst &Inst) const override { return false; } 57 58 /// fixupNeedsRelaxation - Target specific predicate for whether a given 59 /// fixup requires the associated instruction to be relaxed. fixupNeedsRelaxation(const MCFixup & Fixup,uint64_t Value,const MCRelaxableFragment * DF,const MCAsmLayout & Layout)60 bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, 61 const MCRelaxableFragment *DF, 62 const MCAsmLayout &Layout) const override { 63 // FIXME. 64 llvm_unreachable("RelaxInstruction() unimplemented"); 65 return false; 66 } 67 68 /// RelaxInstruction - Relax the instruction in the given fragment 69 /// to the next wider instruction. 70 /// 71 /// \param Inst - The instruction to relax, which may be the same 72 /// as the output. 73 /// \param [out] Res On return, the relaxed instruction. relaxInstruction(const MCInst & Inst,const MCSubtargetInfo & STI,MCInst & Res)74 void relaxInstruction(const MCInst &Inst, const MCSubtargetInfo &STI, 75 MCInst &Res) const override {} 76 77 }; // class Nios2AsmBackend 78 79 } // namespace llvm 80 81 #endif 82