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 
25 #define GET_SUBTARGETINFO_HEADER
26 #include "AVRGenSubtargetInfo.inc"
27 
28 namespace llvm {
29 
30 /// A specific AVR target MCU.
31 class AVRSubtarget : public AVRGenSubtargetInfo {
32 public:
33   //! Creates an AVR subtarget.
34   //! \param TT  The target triple.
35   //! \param CPU The CPU to target.
36   //! \param FS  The feature string.
37   //! \param TM  The target machine.
38   AVRSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
39                const AVRTargetMachine &TM);
40 
getInstrInfo()41   const AVRInstrInfo *getInstrInfo() const override { return &InstrInfo; }
getFrameLowering()42   const TargetFrameLowering *getFrameLowering() const override {
43     return &FrameLowering;
44   }
getTargetLowering()45   const AVRTargetLowering *getTargetLowering() const override {
46     return &TLInfo;
47   }
getSelectionDAGInfo()48   const AVRSelectionDAGInfo *getSelectionDAGInfo() const override {
49     return &TSInfo;
50   }
getRegisterInfo()51   const AVRRegisterInfo *getRegisterInfo() const override {
52     return &InstrInfo.getRegisterInfo();
53   }
54 
55   /// Parses a subtarget feature string, setting appropriate options.
56   /// \note Definition of function is auto generated by `tblgen`.
57   void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
58 
59   AVRSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS,
60                                                 const TargetMachine &TM);
61 
62   // Subtarget feature getters.
63   // See AVR.td for details.
hasSRAM()64   bool hasSRAM() const { return m_hasSRAM; }
hasJMPCALL()65   bool hasJMPCALL() const { return m_hasJMPCALL; }
hasIJMPCALL()66   bool hasIJMPCALL() const { return m_hasIJMPCALL; }
hasEIJMPCALL()67   bool hasEIJMPCALL() const { return m_hasEIJMPCALL; }
hasADDSUBIW()68   bool hasADDSUBIW() const { return m_hasADDSUBIW; }
hasSmallStack()69   bool hasSmallStack() const { return m_hasSmallStack; }
hasMOVW()70   bool hasMOVW() const { return m_hasMOVW; }
hasLPM()71   bool hasLPM() const { return m_hasLPM; }
hasLPMX()72   bool hasLPMX() const { return m_hasLPMX; }
hasELPM()73   bool hasELPM() const { return m_hasELPM; }
hasELPMX()74   bool hasELPMX() const { return m_hasELPMX; }
hasSPM()75   bool hasSPM() const { return m_hasSPM; }
hasSPMX()76   bool hasSPMX() const { return m_hasSPMX; }
hasDES()77   bool hasDES() const { return m_hasDES; }
supportsRMW()78   bool supportsRMW() const { return m_supportsRMW; }
supportsMultiplication()79   bool supportsMultiplication() const { return m_supportsMultiplication; }
hasBREAK()80   bool hasBREAK() const { return m_hasBREAK; }
hasTinyEncoding()81   bool hasTinyEncoding() const { return m_hasTinyEncoding; }
hasMemMappedGPR()82   bool hasMemMappedGPR() const { return m_hasMemMappedGPR; }
83 
getIORegisterOffset()84   uint8_t getIORegisterOffset() const { return hasMemMappedGPR() ? 0x20 : 0x0; }
85 
86   /// Gets the ELF architecture for the e_flags field
87   /// of an ELF object file.
getELFArch()88   unsigned getELFArch() const {
89     assert(ELFArch != 0 &&
90            "every device must have an associate ELF architecture");
91     return ELFArch;
92   }
93 
94   /// Get I/O register addresses.
getIORegRAMPZ()95   int getIORegRAMPZ() const { return hasELPM() ? 0x3b : -1; }
getIORegEIND()96   int getIORegEIND() const { return hasEIJMPCALL() ? 0x3c : -1; }
getIORegSPL()97   int getIORegSPL() const { return 0x3d; }
getIORegSPH()98   int getIORegSPH() const { return hasSmallStack() ? -1 : 0x3e; }
getIORegSREG()99   int getIORegSREG() const { return 0x3f; }
100 
101   /// Get GPR aliases.
getRegTmpIndex()102   int getRegTmpIndex() const { return hasTinyEncoding() ? 16 : 0; }
getRegZeroIndex()103   int getRegZeroIndex() const { return hasTinyEncoding() ? 17 : 1; }
104 
105 private:
106   /// The ELF e_flags architecture.
107   unsigned ELFArch;
108 
109   // Subtarget feature settings
110   // See AVR.td for details.
111   bool m_hasSRAM;
112   bool m_hasJMPCALL;
113   bool m_hasIJMPCALL;
114   bool m_hasEIJMPCALL;
115   bool m_hasADDSUBIW;
116   bool m_hasSmallStack;
117   bool m_hasMOVW;
118   bool m_hasLPM;
119   bool m_hasLPMX;
120   bool m_hasELPM;
121   bool m_hasELPMX;
122   bool m_hasSPM;
123   bool m_hasSPMX;
124   bool m_hasDES;
125   bool m_supportsRMW;
126   bool m_supportsMultiplication;
127   bool m_hasBREAK;
128   bool m_hasTinyEncoding;
129   bool m_hasMemMappedGPR;
130 
131   // Dummy member, used by FeatureSet's. We cannot have a SubtargetFeature with
132   // no variable, so we instead bind pseudo features to this variable.
133   bool m_FeatureSetDummy;
134 
135   AVRInstrInfo InstrInfo;
136   AVRFrameLowering FrameLowering;
137   AVRTargetLowering TLInfo;
138   AVRSelectionDAGInfo TSInfo;
139 };
140 
141 } // end namespace llvm
142 
143 #endif // LLVM_AVR_SUBTARGET_H
144