1 //===-- AVRAsmBackend.h - AVR 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 // \file The AVR assembly backend implementation. 11 // 12 //===----------------------------------------------------------------------===// 13 // 14 15 #ifndef LLVM_AVR_ASM_BACKEND_H 16 #define LLVM_AVR_ASM_BACKEND_H 17 18 #include "MCTargetDesc/AVRFixupKinds.h" 19 20 #include "llvm/ADT/Triple.h" 21 #include "llvm/MC/MCAsmBackend.h" 22 23 namespace llvm { 24 25 class MCAssembler; 26 class MCObjectWriter; 27 class Target; 28 29 struct MCFixupKindInfo; 30 31 /// Utilities for manipulating generated AVR machine code. 32 class AVRAsmBackend : public MCAsmBackend { 33 public: AVRAsmBackend(Triple::OSType OSType)34 AVRAsmBackend(Triple::OSType OSType) 35 : MCAsmBackend(support::little), OSType(OSType) {} 36 37 void adjustFixupValue(const MCFixup &Fixup, const MCValue &Target, 38 uint64_t &Value, MCContext *Ctx = nullptr) const; 39 40 std::unique_ptr<MCObjectTargetWriter> 41 createObjectTargetWriter() const override; 42 43 void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup, 44 const MCValue &Target, MutableArrayRef<char> Data, 45 uint64_t Value, bool IsResolved, 46 const MCSubtargetInfo *STI) const override; 47 48 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override; 49 getNumFixupKinds()50 unsigned getNumFixupKinds() const override { 51 return AVR::NumTargetFixupKinds; 52 } 53 mayNeedRelaxation(const MCInst & Inst,const MCSubtargetInfo & STI)54 bool mayNeedRelaxation(const MCInst &Inst, 55 const MCSubtargetInfo &STI) const override { 56 return false; 57 } 58 fixupNeedsRelaxation(const MCFixup & Fixup,uint64_t Value,const MCRelaxableFragment * DF,const MCAsmLayout & Layout)59 bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, 60 const MCRelaxableFragment *DF, 61 const MCAsmLayout &Layout) const override { 62 llvm_unreachable("RelaxInstruction() unimplemented"); 63 return false; 64 } 65 relaxInstruction(const MCInst & Inst,const MCSubtargetInfo & STI,MCInst & Res)66 void relaxInstruction(const MCInst &Inst, const MCSubtargetInfo &STI, 67 MCInst &Res) const override {} 68 69 bool writeNopData(raw_ostream &OS, uint64_t Count) const override; 70 71 bool shouldForceRelocation(const MCAssembler &Asm, const MCFixup &Fixup, 72 const MCValue &Target) override; 73 74 private: 75 Triple::OSType OSType; 76 }; 77 78 } // end namespace llvm 79 80 #endif // LLVM_AVR_ASM_BACKEND_H 81 82