BPFInstructionSelector.cpp

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//===- BPFInstructionSelector.cpp --------------------------------*- C++ -*-==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
/// This file implements the targeting of the InstructionSelector class for BPF.
//===----------------------------------------------------------------------===//
 
#include "BPFInstrInfo.h"
#include "BPFRegisterBankInfo.h"
#include "BPFSubtarget.h"
#include "BPFTargetMachine.h"
#include "llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h"
#include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
#include "llvm/IR/IntrinsicsBPF.h"
 
#define DEBUG_TYPE "bpf-gisel"
 
using namespace llvm;
 
namespace {
 
#define GET_GLOBALISEL_PREDICATE_BITSET
#include "BPFGenGlobalISel.inc"
#undef GET_GLOBALISEL_PREDICATE_BITSET
 
class BPFInstructionSelector : public InstructionSelector {
public:
  BPFInstructionSelector(const BPFTargetMachine &TM, const BPFSubtarget &STI,
                         const BPFRegisterBankInfo &RBI);
 
  bool select(MachineInstr &I) override;
  static const char *getName() { return DEBUG_TYPE; }
 
private:
  /// tblgen generated 'select' implementation that is used as the initial
  /// selector for the patterns that do not require complex C++.
  bool selectImpl(MachineInstr &I, CodeGenCoverage &CoverageInfo) const;
 
  const BPFInstrInfo &TII;
  const BPFRegisterInfo &TRI;
  const BPFRegisterBankInfo &RBI;
 
#define GET_GLOBALISEL_PREDICATES_DECL
#include "BPFGenGlobalISel.inc"
#undef GET_GLOBALISEL_PREDICATES_DECL
 
#define GET_GLOBALISEL_TEMPORARIES_DECL
#include "BPFGenGlobalISel.inc"
#undef GET_GLOBALISEL_TEMPORARIES_DECL
};
 
} // namespace
 
#define GET_GLOBALISEL_IMPL
#include "BPFGenGlobalISel.inc"
#undef GET_GLOBALISEL_IMPL
 
BPFInstructionSelector::BPFInstructionSelector(const BPFTargetMachine &TM,
                                               const BPFSubtarget &STI,
                                               const BPFRegisterBankInfo &RBI)
    : TII(*STI.getInstrInfo()), TRI(*STI.getRegisterInfo()), RBI(RBI),
#define GET_GLOBALISEL_PREDICATES_INIT
#include "BPFGenGlobalISel.inc"
#undef GET_GLOBALISEL_PREDICATES_INIT
#define GET_GLOBALISEL_TEMPORARIES_INIT
#include "BPFGenGlobalISel.inc"
#undef GET_GLOBALISEL_TEMPORARIES_INIT
{
}
 
bool BPFInstructionSelector::select(MachineInstr &I) {
  if (!isPreISelGenericOpcode(I.getOpcode()))
    return true;
  if (selectImpl(I, *CoverageInfo))
    return true;
  return false;
}
 
namespace llvm {
InstructionSelector *
createBPFInstructionSelector(const BPFTargetMachine &TM,
                             const BPFSubtarget &Subtarget,
                             const BPFRegisterBankInfo &RBI) {
  return new BPFInstructionSelector(TM, Subtarget, RBI);
}
} // namespace llvm