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 "BPFRegisterInfo.h"
20 #include "BPFSelectionDAGInfo.h"
21 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
22 #include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
23 #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
24 #include "llvm/CodeGen/RegisterBankInfo.h"
25 #include "llvm/CodeGen/SelectionDAGTargetInfo.h"
26 #include "llvm/CodeGen/TargetSubtargetInfo.h"
27 #include "llvm/IR/DataLayout.h"
28 #include "llvm/Target/TargetMachine.h"
29 
30 #define GET_SUBTARGETINFO_HEADER
31 #include "BPFGenSubtargetInfo.inc"
32 
33 namespace llvm {
34 class StringRef;
35 
36 class BPFSubtarget : public BPFGenSubtargetInfo {
37   virtual void anchor();
38   BPFInstrInfo InstrInfo;
39   BPFFrameLowering FrameLowering;
40   BPFTargetLowering TLInfo;
41   BPFSelectionDAGInfo TSInfo;
42 
43 private:
44   void initializeEnvironment();
45   void initSubtargetFeatures(StringRef CPU, StringRef FS);
46 
47 protected:
48   // unused
49   bool isDummyMode;
50 
51   bool IsLittleEndian;
52 
53   // whether the cpu supports jmp ext
54   bool HasJmpExt;
55 
56   // whether the cpu supports jmp32 ext.
57   // NOTE: jmp32 is not enabled when alu32 enabled.
58   bool HasJmp32;
59 
60   // whether the cpu supports alu32 instructions.
61   bool HasAlu32;
62 
63   // whether we should enable MCAsmInfo DwarfUsesRelocationsAcrossSections
64   bool UseDwarfRIS;
65 
66   // whether cpu v4 insns are enabled.
67   bool HasLdsx, HasMovsx, HasBswap, HasSdivSmod, HasGotol, HasStoreImm;
68 
69   std::unique_ptr<CallLowering> CallLoweringInfo;
70   std::unique_ptr<InstructionSelector> InstSelector;
71   std::unique_ptr<LegalizerInfo> Legalizer;
72   std::unique_ptr<RegisterBankInfo> RegBankInfo;
73 
74 public:
75   // This constructor initializes the data members to match that
76   // of the specified triple.
77   BPFSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
78                const TargetMachine &TM);
79 
80   BPFSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
81 
82   // ParseSubtargetFeatures - Parses features string setting specified
83   // subtarget options.  Definition of function is auto generated by tblgen.
84   void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
getHasJmpExt()85   bool getHasJmpExt() const { return HasJmpExt; }
getHasJmp32()86   bool getHasJmp32() const { return HasJmp32; }
getHasAlu32()87   bool getHasAlu32() const { return HasAlu32; }
getUseDwarfRIS()88   bool getUseDwarfRIS() const { return UseDwarfRIS; }
hasLdsx()89   bool hasLdsx() const { return HasLdsx; }
hasMovsx()90   bool hasMovsx() const { return HasMovsx; }
hasBswap()91   bool hasBswap() const { return HasBswap; }
hasSdivSmod()92   bool hasSdivSmod() const { return HasSdivSmod; }
hasGotol()93   bool hasGotol() const { return HasGotol; }
hasStoreImm()94   bool hasStoreImm() const { return HasStoreImm; }
95 
isLittleEndian()96   bool isLittleEndian() const { return IsLittleEndian; }
97 
getInstrInfo()98   const BPFInstrInfo *getInstrInfo() const override { return &InstrInfo; }
getFrameLowering()99   const BPFFrameLowering *getFrameLowering() const override {
100     return &FrameLowering;
101   }
getTargetLowering()102   const BPFTargetLowering *getTargetLowering() const override {
103     return &TLInfo;
104   }
getSelectionDAGInfo()105   const BPFSelectionDAGInfo *getSelectionDAGInfo() const override {
106     return &TSInfo;
107   }
getRegisterInfo()108   const BPFRegisterInfo *getRegisterInfo() const override {
109     return &InstrInfo.getRegisterInfo();
110   }
111 
112   const CallLowering *getCallLowering() const override;
113   InstructionSelector *getInstructionSelector() const override;
114   const LegalizerInfo *getLegalizerInfo() const override;
115   const RegisterBankInfo *getRegBankInfo() const override;
116 };
117 } // End llvm namespace
118 
119 #endif
120