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