llvm/llvm/lib/Target/BPF/BPFISelDAGToDAG.cpp

//===-- BPFISelDAGToDAG.cpp - A dag to dag inst selector for BPF ----------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file defines a DAG pattern matching instruction selector for BPF,
// converting from a legalized dag to a BPF dag.
//
//===----------------------------------------------------------------------===//

#include "BPF.h"
#include "BPFRegisterInfo.h"
#include "BPFSubtarget.h"
#include "BPFTargetMachine.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/IntrinsicsBPF.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"

usingnamespacellvm;

#define DEBUG_TYPE …
#define PASS_NAME …

// Instruction Selector Implementation
namespace {

class BPFDAGToDAGISel : public SelectionDAGISel { … };

class BPFDAGToDAGISelLegacy : public SelectionDAGISelLegacy { … };
} // namespace

char BPFDAGToDAGISelLegacy::ID = …;

INITIALIZE_PASS(…)

// ComplexPattern used on BPF Load/Store instructions
bool BPFDAGToDAGISel::SelectAddr(SDValue Addr, SDValue &Base, SDValue &Offset) { … }

// ComplexPattern used on BPF FI instruction
bool BPFDAGToDAGISel::SelectFIAddr(SDValue Addr, SDValue &Base,
                                   SDValue &Offset) { … }

bool BPFDAGToDAGISel::SelectInlineAsmMemoryOperand(
    const SDValue &Op, InlineAsm::ConstraintCode ConstraintCode,
    std::vector<SDValue> &OutOps) { … }

void BPFDAGToDAGISel::Select(SDNode *Node) { … }

void BPFDAGToDAGISel::PreprocessLoad(SDNode *Node,
                                     SelectionDAG::allnodes_iterator &I) { … }

void BPFDAGToDAGISel::PreprocessISelDAG() { … }

bool BPFDAGToDAGISel::getConstantFieldValue(const GlobalAddressSDNode *Node,
                                            uint64_t Offset, uint64_t Size,
                                            unsigned char *ByteSeq) { … }

bool BPFDAGToDAGISel::fillGenericConstant(const DataLayout &DL,
                                          const Constant *CV,
                                          val_vec_type &Vals, uint64_t Offset) { … }

bool BPFDAGToDAGISel::fillConstantDataArray(const DataLayout &DL,
                                            const ConstantDataArray *CDA,
                                            val_vec_type &Vals, int Offset) { … }

bool BPFDAGToDAGISel::fillConstantArray(const DataLayout &DL,
                                        const ConstantArray *CA,
                                        val_vec_type &Vals, int Offset) { … }

bool BPFDAGToDAGISel::fillConstantStruct(const DataLayout &DL,
                                         const ConstantStruct *CS,
                                         val_vec_type &Vals, int Offset) { … }

void BPFDAGToDAGISel::PreprocessTrunc(SDNode *Node,
                                      SelectionDAG::allnodes_iterator &I) { … }

FunctionPass *llvm::createBPFISelDag(BPFTargetMachine &TM) { … }