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