// Copyright (c) 2021, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.android.tools.r8.optimize.argumentpropagation.codescanner;

import com.android.tools.r8.graph.AppView;
import com.android.tools.r8.graph.DexType;
import com.android.tools.r8.ir.analysis.type.DynamicType;
import com.android.tools.r8.shaking.AppInfoWithLiveness;
import com.android.tools.r8.utils.Action;

public class BottomReceiverParameterState extends BottomParameterState {

  private static final BottomReceiverParameterState INSTANCE = new BottomReceiverParameterState();

  private BottomReceiverParameterState() {}

  public static BottomReceiverParameterState get() {
    return INSTANCE;
  }

  @Override
  public ParameterState mutableJoin(
      AppView<AppInfoWithLiveness> appView,
      ParameterState parameterState,
      DexType parameterType,
      Action onChangedAction) {
    if (parameterState.isBottom()) {
      return this;
    }
    if (parameterState.isUnknown()) {
      return parameterState;
    }
    assert parameterState.isConcrete();
    assert parameterState.asConcrete().isReferenceParameter();
    ConcreteReferenceTypeParameterState concreteParameterState =
        parameterState.asConcrete().asReferenceParameter();
    DynamicType dynamicType = concreteParameterState.getDynamicType();
    if (dynamicType.isUnknown()) {
      return unknown();
    }
    return new ConcreteReceiverParameterState(
        dynamicType, concreteParameterState.copyInParameters());
  }
}