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
28namespace llvm {
29class StringRef;
30
31class BPFSubtarget : public BPFGenSubtargetInfo {
32  virtual void anchor();
33  BPFInstrInfo InstrInfo;
34  BPFFrameLowering FrameLowering;
35  BPFTargetLowering TLInfo;
36  BPFSelectionDAGInfo TSInfo;
37
38private:
39  void initializeEnvironment();
40  void initSubtargetFeatures(StringRef CPU, StringRef FS);
41  bool probeJmpExt();
42
43protected:
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
60public:
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
93