92 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8/// \file9/// 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/IR/IntrinsicsBPF.h"20 21#define DEBUG_TYPE "bpf-gisel"22 23using namespace llvm;24 25namespace {26 27#define GET_GLOBALISEL_PREDICATE_BITSET28#include "BPFGenGlobalISel.inc"29#undef GET_GLOBALISEL_PREDICATE_BITSET30 31class BPFInstructionSelector : public InstructionSelector {32public:33 BPFInstructionSelector(const BPFTargetMachine &TM, const BPFSubtarget &STI,34 const BPFRegisterBankInfo &RBI);35 36 bool select(MachineInstr &I) override;37 static const char *getName() { return DEBUG_TYPE; }38 39private:40 /// tblgen generated 'select' implementation that is used as the initial41 /// selector for the patterns that do not require complex C++.42 bool selectImpl(MachineInstr &I, CodeGenCoverage &CoverageInfo) const;43 44 const BPFInstrInfo &TII;45 const BPFRegisterInfo &TRI;46 const BPFRegisterBankInfo &RBI;47 48#define GET_GLOBALISEL_PREDICATES_DECL49#include "BPFGenGlobalISel.inc"50#undef GET_GLOBALISEL_PREDICATES_DECL51 52#define GET_GLOBALISEL_TEMPORARIES_DECL53#include "BPFGenGlobalISel.inc"54#undef GET_GLOBALISEL_TEMPORARIES_DECL55};56 57} // namespace58 59#define GET_GLOBALISEL_IMPL60#include "BPFGenGlobalISel.inc"61#undef GET_GLOBALISEL_IMPL62 63BPFInstructionSelector::BPFInstructionSelector(const BPFTargetMachine &TM,64 const BPFSubtarget &STI,65 const BPFRegisterBankInfo &RBI)66 : TII(*STI.getInstrInfo()), TRI(*STI.getRegisterInfo()), RBI(RBI),67#define GET_GLOBALISEL_PREDICATES_INIT68#include "BPFGenGlobalISel.inc"69#undef GET_GLOBALISEL_PREDICATES_INIT70#define GET_GLOBALISEL_TEMPORARIES_INIT71#include "BPFGenGlobalISel.inc"72#undef GET_GLOBALISEL_TEMPORARIES_INIT73{74}75 76bool BPFInstructionSelector::select(MachineInstr &I) {77 if (!isPreISelGenericOpcode(I.getOpcode()))78 return true;79 if (selectImpl(I, *CoverageInfo))80 return true;81 return false;82}83 84namespace llvm {85InstructionSelector *86createBPFInstructionSelector(const BPFTargetMachine &TM,87 const BPFSubtarget &Subtarget,88 const BPFRegisterBankInfo &RBI) {89 return new BPFInstructionSelector(TM, Subtarget, RBI);90}91} // namespace llvm92