1 //===-- AVRSubtarget.h - Define Subtarget for the AVR -----------*- C++ -*-===//
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 // This file declares the AVR specific subclass of TargetSubtargetInfo.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_AVR_SUBTARGET_H
14 #define LLVM_AVR_SUBTARGET_H
15 
16 #include "llvm/CodeGen/TargetSubtargetInfo.h"
17 #include "llvm/IR/DataLayout.h"
18 #include "llvm/Target/TargetMachine.h"
19 
20 #include "AVRFrameLowering.h"
21 #include "AVRISelLowering.h"
22 #include "AVRInstrInfo.h"
23 #include "AVRSelectionDAGInfo.h"
24 #include "MCTargetDesc/AVRMCTargetDesc.h"
25 
26 #define GET_SUBTARGETINFO_HEADER
27 #include "AVRGenSubtargetInfo.inc"
28 
29 namespace llvm {
30 
31 /// A specific AVR target MCU.
32 class AVRSubtarget : public AVRGenSubtargetInfo {
33 public:
34   //! Creates an AVR subtarget.
35   //! \param TT  The target triple.
36   //! \param CPU The CPU to target.
37   //! \param FS  The feature string.
38   //! \param TM  The target machine.
39   AVRSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
40                const AVRTargetMachine &TM);
41 
42   const AVRInstrInfo *getInstrInfo() const override { return &InstrInfo; }
43   const TargetFrameLowering *getFrameLowering() const override {
44     return &FrameLowering;
45   }
46   const AVRTargetLowering *getTargetLowering() const override {
47     return &TLInfo;
48   }
49   const AVRSelectionDAGInfo *getSelectionDAGInfo() const override {
50     return &TSInfo;
51   }
52   const AVRRegisterInfo *getRegisterInfo() const override {
53     return &InstrInfo.getRegisterInfo();
54   }
55 
56   /// Parses a subtarget feature string, setting appropriate options.
57   /// \note Definition of function is auto generated by `tblgen`.
58   void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
59 
60   AVRSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS,
61                                                 const TargetMachine &TM);
62 
63   // Subtarget feature getters.
64 #define GET_SUBTARGETINFO_MACRO(ATTRIBUTE, DEFAULT, GETTER)                    \
65   bool GETTER() const { return ATTRIBUTE; }
66 #include "AVRGenSubtargetInfo.inc"
67 
68   uint8_t getIORegisterOffset() const { return hasMemMappedGPR() ? 0x20 : 0x0; }
69 
70   bool enableSubRegLiveness() const override { return true; }
71 
72   /// Gets the ELF architecture for the e_flags field
73   /// of an ELF object file.
74   unsigned getELFArch() const {
75     assert(ELFArch != 0 &&
76            "every device must have an associate ELF architecture");
77     return ELFArch;
78   }
79 
80   /// Get I/O register addresses.
81   int getIORegRAMPZ() const { return hasELPM() ? 0x3b : -1; }
82   int getIORegEIND() const { return hasEIJMPCALL() ? 0x3c : -1; }
83   int getIORegSPL() const { return 0x3d; }
84   int getIORegSPH() const { return hasSmallStack() ? -1 : 0x3e; }
85   int getIORegSREG() const { return 0x3f; }
86 
87   /// Get GPR aliases.
88   int getRegTmpIndex() const { return hasTinyEncoding() ? 16 : 0; }
89   int getRegZeroIndex() const { return hasTinyEncoding() ? 17 : 1; }
90 
91   Register getTmpRegister() const {
92     return hasTinyEncoding() ? AVR::R16 : AVR::R0;
93   }
94   Register getZeroRegister() const {
95     return hasTinyEncoding() ? AVR::R17 : AVR::R1;
96   }
97 
98 private:
99   /// The ELF e_flags architecture.
100   unsigned ELFArch = 0;
101 
102   // Subtarget feature settings
103 #define GET_SUBTARGETINFO_MACRO(ATTRIBUTE, DEFAULT, GETTER)                    \
104   bool ATTRIBUTE = DEFAULT;
105 #include "AVRGenSubtargetInfo.inc"
106 
107   AVRInstrInfo InstrInfo;
108   AVRFrameLowering FrameLowering;
109   AVRTargetLowering TLInfo;
110   AVRSelectionDAGInfo TSInfo;
111 };
112 
113 } // end namespace llvm
114 
115 #endif // LLVM_AVR_SUBTARGET_H
116