llvm/llvm/lib/CodeGen/SwiftErrorValueTracking.cpp

//===-- SwiftErrorValueTracking.cpp --------------------------------------===//
//
// 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 implements a limited mem2reg-like analysis to promote uses of function
// arguments and allocas marked with swiftalloc from memory into virtual
// registers tracked by this class.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/SwiftErrorValueTracking.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/IR/Value.h"

usingnamespacellvm;

Register SwiftErrorValueTracking::getOrCreateVReg(const MachineBasicBlock *MBB,
                                                  const Value *Val) { … }

void SwiftErrorValueTracking::setCurrentVReg(const MachineBasicBlock *MBB,
                                             const Value *Val, Register VReg) { … }

Register SwiftErrorValueTracking::getOrCreateVRegDefAt(
    const Instruction *I, const MachineBasicBlock *MBB, const Value *Val) { … }

Register SwiftErrorValueTracking::getOrCreateVRegUseAt(
    const Instruction *I, const MachineBasicBlock *MBB, const Value *Val) { … }

/// Set up SwiftErrorVals by going through the function. If the function has
/// swifterror argument, it will be the first entry.
void SwiftErrorValueTracking::setFunction(MachineFunction &mf) { … }

bool SwiftErrorValueTracking::createEntriesInEntryBlock(DebugLoc DbgLoc) { … }

/// Propagate swifterror values through the machine function CFG.
void SwiftErrorValueTracking::propagateVRegs() { … }

void SwiftErrorValueTracking::preassignVRegs(
    MachineBasicBlock *MBB, BasicBlock::const_iterator Begin,
    BasicBlock::const_iterator End) { … }