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      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 
     41   const AVRInstrInfo *getInstrInfo() const override { return &InstrInfo; }
     42   const TargetFrameLowering *getFrameLowering() const override { return &FrameLowering; }
     43   const AVRTargetLowering *getTargetLowering() const override { return &TLInfo; }
     44   const AVRSelectionDAGInfo *getSelectionDAGInfo() const override { return &TSInfo; }
     45   const AVRRegisterInfo *getRegisterInfo() const override { return &InstrInfo.getRegisterInfo(); }
     46 
     47   /// Parses a subtarget feature string, setting appropriate options.
     48   /// \note Definition of function is auto generated by `tblgen`.
     49   void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
     50 
     51   AVRSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS,
     52                                                 const TargetMachine &TM);
     53 
     54   // Subtarget feature getters.
     55   // See AVR.td for details.
     56   bool hasSRAM() const { return m_hasSRAM; }
     57   bool hasJMPCALL() const { return m_hasJMPCALL; }
     58   bool hasIJMPCALL() const { return m_hasIJMPCALL; }
     59   bool hasEIJMPCALL() const { return m_hasEIJMPCALL; }
     60   bool hasADDSUBIW() const { return m_hasADDSUBIW; }
     61   bool hasSmallStack() const { return m_hasSmallStack; }
     62   bool hasMOVW() const { return m_hasMOVW; }
     63   bool hasLPM() const { return m_hasLPM; }
     64   bool hasLPMX() const { return m_hasLPMX; }
     65   bool hasELPM() const { return m_hasELPM; }
     66   bool hasELPMX() const { return m_hasELPMX; }
     67   bool hasSPM() const { return m_hasSPM; }
     68   bool hasSPMX() const { return m_hasSPMX; }
     69   bool hasDES() const { return m_hasDES; }
     70   bool supportsRMW() const { return m_supportsRMW; }
     71   bool supportsMultiplication() const { return m_supportsMultiplication; }
     72   bool hasBREAK() const { return m_hasBREAK; }
     73   bool hasTinyEncoding() const { return m_hasTinyEncoding; }
     74   bool hasMemMappedGPR() const { return m_hasMemMappedGPR; }
     75 
     76   uint8_t getIORegisterOffset() const { return hasMemMappedGPR() ? 0x20 : 0x0; }
     77 
     78   /// Gets the ELF architecture for the e_flags field
     79   /// of an ELF object file.
     80   unsigned getELFArch() const {
     81     assert(ELFArch != 0 &&
     82            "every device must have an associate ELF architecture");
     83     return ELFArch;
     84   }
     85 
     86 private:
     87 
     88   /// The ELF e_flags architecture.
     89   unsigned ELFArch;
     90 
     91   // Subtarget feature settings
     92   // See AVR.td for details.
     93   bool m_hasSRAM;
     94   bool m_hasJMPCALL;
     95   bool m_hasIJMPCALL;
     96   bool m_hasEIJMPCALL;
     97   bool m_hasADDSUBIW;
     98   bool m_hasSmallStack;
     99   bool m_hasMOVW;
    100   bool m_hasLPM;
    101   bool m_hasLPMX;
    102   bool m_hasELPM;
    103   bool m_hasELPMX;
    104   bool m_hasSPM;
    105   bool m_hasSPMX;
    106   bool m_hasDES;
    107   bool m_supportsRMW;
    108   bool m_supportsMultiplication;
    109   bool m_hasBREAK;
    110   bool m_hasTinyEncoding;
    111   bool m_hasMemMappedGPR;
    112 
    113   // Dummy member, used by FeatureSet's. We cannot have a SubtargetFeature with
    114   // no variable, so we instead bind pseudo features to this variable.
    115   bool m_FeatureSetDummy;
    116 
    117   AVRInstrInfo InstrInfo;
    118   AVRFrameLowering FrameLowering;
    119   AVRTargetLowering TLInfo;
    120   AVRSelectionDAGInfo TSInfo;
    121 };
    122 
    123 } // end namespace llvm
    124 
    125 #endif // LLVM_AVR_SUBTARGET_H
    126