1 //===- BPFInstructionSelector.cpp --------------------------------*- 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 /// \file
9 /// This file implements the targeting of the InstructionSelector class for BPF.
10 //===----------------------------------------------------------------------===//
11
12 #include "BPFInstrInfo.h"
13 #include "BPFRegisterBankInfo.h"
14 #include "BPFSubtarget.h"
15 #include "BPFTargetMachine.h"
16 #include "llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h"
17 #include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
18 #include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/IR/IntrinsicsBPF.h"
21 #include "llvm/Support/Debug.h"
22
23 #define DEBUG_TYPE "bpf-gisel"
24
25 using namespace llvm;
26
27 namespace {
28
29 #define GET_GLOBALISEL_PREDICATE_BITSET
30 #include "BPFGenGlobalISel.inc"
31 #undef GET_GLOBALISEL_PREDICATE_BITSET
32
33 class BPFInstructionSelector : public InstructionSelector {
34 public:
35 BPFInstructionSelector(const BPFTargetMachine &TM, const BPFSubtarget &STI,
36 const BPFRegisterBankInfo &RBI);
37
38 bool select(MachineInstr &I) override;
getName()39 static const char *getName() { return DEBUG_TYPE; }
40
41 private:
42 /// tblgen generated 'select' implementation that is used as the initial
43 /// selector for the patterns that do not require complex C++.
44 bool selectImpl(MachineInstr &I, CodeGenCoverage &CoverageInfo) const;
45
46 const BPFInstrInfo &TII;
47 const BPFRegisterInfo &TRI;
48 const BPFRegisterBankInfo &RBI;
49
50 #define GET_GLOBALISEL_PREDICATES_DECL
51 #include "BPFGenGlobalISel.inc"
52 #undef GET_GLOBALISEL_PREDICATES_DECL
53
54 #define GET_GLOBALISEL_TEMPORARIES_DECL
55 #include "BPFGenGlobalISel.inc"
56 #undef GET_GLOBALISEL_TEMPORARIES_DECL
57 };
58
59 } // namespace
60
61 #define GET_GLOBALISEL_IMPL
62 #include "BPFGenGlobalISel.inc"
63 #undef GET_GLOBALISEL_IMPL
64
BPFInstructionSelector(const BPFTargetMachine & TM,const BPFSubtarget & STI,const BPFRegisterBankInfo & RBI)65 BPFInstructionSelector::BPFInstructionSelector(const BPFTargetMachine &TM,
66 const BPFSubtarget &STI,
67 const BPFRegisterBankInfo &RBI)
68 : TII(*STI.getInstrInfo()), TRI(*STI.getRegisterInfo()), RBI(RBI),
69 #define GET_GLOBALISEL_PREDICATES_INIT
70 #include "BPFGenGlobalISel.inc"
71 #undef GET_GLOBALISEL_PREDICATES_INIT
72 #define GET_GLOBALISEL_TEMPORARIES_INIT
73 #include "BPFGenGlobalISel.inc"
74 #undef GET_GLOBALISEL_TEMPORARIES_INIT
75 {
76 }
77
select(MachineInstr & I)78 bool BPFInstructionSelector::select(MachineInstr &I) {
79 if (!isPreISelGenericOpcode(I.getOpcode()))
80 return true;
81 if (selectImpl(I, *CoverageInfo))
82 return true;
83 return false;
84 }
85
86 namespace llvm {
87 InstructionSelector *
createBPFInstructionSelector(const BPFTargetMachine & TM,const BPFSubtarget & Subtarget,const BPFRegisterBankInfo & RBI)88 createBPFInstructionSelector(const BPFTargetMachine &TM,
89 const BPFSubtarget &Subtarget,
90 const BPFRegisterBankInfo &RBI) {
91 return new BPFInstructionSelector(TM, Subtarget, RBI);
92 }
93 } // namespace llvm
94