llvm/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/MC/MCAsmBackend.h"
  20 #include "llvm/TargetParser/Triple.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:
  31   AVRAsmBackend(Triple::OSType OSType)
  32       : MCAsmBackend(llvm::endianness::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   std::optional<MCFixupKind> getFixupKind(StringRef Name) const override;
  46   const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
  47
  48   unsigned getNumFixupKinds() const override {
  49     return AVR::NumTargetFixupKinds;
  50   }
  51
  52   bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
  53                             const MCRelaxableFragment *DF,
  54                             const MCAsmLayout &Layout) const override {
  55     llvm_unreachable("RelaxInstruction() unimplemented");
  56     return false;
  57   }
  58
  59   bool writeNopData(raw_ostream &OS, uint64_t Count,
  60                     const MCSubtargetInfo *STI) const override;
  61
  62   bool shouldForceRelocation(const MCAssembler &Asm, const MCFixup &Fixup,
  63                              const MCValue &Target,
  64                              const MCSubtargetInfo *STI) override;
  65
  66 private:
  67   Triple::OSType OSType;
  68 };
  69
  70 } // end namespace llvm
  71
  72 #endif // LLVM_AVR_ASM_BACKEND_H