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 TuneCPU, 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 93