lib/Target/AVR/MCTargetDesc/AVRAsmBackend.h

   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:
  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
  50   unsigned getNumFixupKinds() const override {
  51     return AVR::NumTargetFixupKinds;
  52   }
  53
  54   bool mayNeedRelaxation(const MCInst &Inst,
  55                          const MCSubtargetInfo &STI) const override {
  56     return false;
  57   }
  58
  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
  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