1 //===-- AVRAsmBackend.h - AVR Asm Backend --------------------------------===// 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 // \file The AVR assembly backend implementation. 10 // 11 //===----------------------------------------------------------------------===// 12 // 13 14 #ifndef LLVM_AVR_ASM_BACKEND_H 15 #define LLVM_AVR_ASM_BACKEND_H 16 17 #include "MCTargetDesc/AVRFixupKinds.h" 18 19 #include "llvm/ADT/Triple.h" 20 #include "llvm/MC/MCAsmBackend.h" 21 22 namespace llvm { 23 24 class MCAssembler; 25 class MCContext; 26 struct MCFixupKindInfo; 27 28 /// Utilities for manipulating generated AVR machine code. 29 class AVRAsmBackend : public MCAsmBackend { 30 public: AVRAsmBackend(Triple::OSType OSType)31 AVRAsmBackend(Triple::OSType OSType) 32 : MCAsmBackend(support::little), OSType(OSType) {} 33 34 void adjustFixupValue(const MCFixup &Fixup, const MCValue &Target, 35 uint64_t &Value, MCContext *Ctx = nullptr) const; 36 37 std::unique_ptr<MCObjectTargetWriter> 38 createObjectTargetWriter() const override; 39 40 void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup, 41 const MCValue &Target, MutableArrayRef<char> Data, 42 uint64_t Value, bool IsResolved, 43 const MCSubtargetInfo *STI) const override; 44 45 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override; 46 getNumFixupKinds()47 unsigned getNumFixupKinds() const override { 48 return AVR::NumTargetFixupKinds; 49 } 50 fixupNeedsRelaxation(const MCFixup & Fixup,uint64_t Value,const MCRelaxableFragment * DF,const MCAsmLayout & Layout)51 bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, 52 const MCRelaxableFragment *DF, 53 const MCAsmLayout &Layout) const override { 54 llvm_unreachable("RelaxInstruction() unimplemented"); 55 return false; 56 } 57 58 bool writeNopData(raw_ostream &OS, uint64_t Count) const override; 59 60 bool shouldForceRelocation(const MCAssembler &Asm, const MCFixup &Fixup, 61 const MCValue &Target) override; 62 63 private: 64 Triple::OSType OSType; 65 }; 66 67 } // end namespace llvm 68 69 #endif // LLVM_AVR_ASM_BACKEND_H 70 71