lib/Target/BPF/BPFSubtarget.h

   1 //===-- BPFSubtarget.h - Define Subtarget for the BPF -----------*- 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 BPF specific subclass of TargetSubtargetInfo.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_BPF_BPFSUBTARGET_H
  14 #define LLVM_LIB_TARGET_BPF_BPFSUBTARGET_H
  15
  16 #include "BPFFrameLowering.h"
  17 #include "BPFISelLowering.h"
  18 #include "BPFInstrInfo.h"
  19 #include "BPFSelectionDAGInfo.h"
  20 #include "llvm/CodeGen/SelectionDAGTargetInfo.h"
  21 #include "llvm/CodeGen/TargetSubtargetInfo.h"
  22 #include "llvm/IR/DataLayout.h"
  23 #include "llvm/Target/TargetMachine.h"
  24
  25 #define GET_SUBTARGETINFO_HEADER
  26 #include "BPFGenSubtargetInfo.inc"
  27
  28 namespace llvm {
  29 class StringRef;
  30
  31 class BPFSubtarget : public BPFGenSubtargetInfo {
  32   virtual void anchor();
  33   BPFInstrInfo InstrInfo;
  34   BPFFrameLowering FrameLowering;
  35   BPFTargetLowering TLInfo;
  36   BPFSelectionDAGInfo TSInfo;
  37
  38 private:
  39   void initializeEnvironment();
  40   void initSubtargetFeatures(StringRef CPU, StringRef FS);
  41   bool probeJmpExt();
  42
  43 protected:
  44   // unused
  45   bool isDummyMode;
  46
  47   // whether the cpu supports jmp ext
  48   bool HasJmpExt;
  49
  50   // whether the cpu supports jmp32 ext.
  51   // NOTE: jmp32 is not enabled when alu32 enabled.
  52   bool HasJmp32;
  53
  54   // whether the cpu supports alu32 instructions.
  55   bool HasAlu32;
  56
  57   // whether we should enable MCAsmInfo DwarfUsesRelocationsAcrossSections
  58   bool UseDwarfRIS;
  59
  60 public:
  61   // This constructor initializes the data members to match that
  62   // of the specified triple.
  63   BPFSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
  64                const TargetMachine &TM);
  65
  66   BPFSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
  67
  68   // ParseSubtargetFeatures - Parses features string setting specified
  69   // subtarget options.  Definition of function is auto generated by tblgen.
  70   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
  71   bool getHasJmpExt() const { return HasJmpExt; }
  72   bool getHasJmp32() const { return HasJmp32; }
  73   bool getHasAlu32() const { return HasAlu32; }
  74   bool getUseDwarfRIS() const { return UseDwarfRIS; }
  75
  76   const BPFInstrInfo *getInstrInfo() const override { return &InstrInfo; }
  77   const BPFFrameLowering *getFrameLowering() const override {
  78     return &FrameLowering;
  79   }
  80   const BPFTargetLowering *getTargetLowering() const override {
  81     return &TLInfo;
  82   }
  83   const BPFSelectionDAGInfo *getSelectionDAGInfo() const override {
  84     return &TSInfo;
  85   }
  86   const TargetRegisterInfo *getRegisterInfo() const override {
  87     return &InstrInfo.getRegisterInfo();
  88   }
  89 };
  90 } // End llvm namespace
  91
  92 #endif