lib/Target/AVR/MCTargetDesc/AVRAsmBackend.h

   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