src/main/java/com/android/tools/r8/optimize/argumentpropagation/codescanner/BottomPrimitiveTypeValueState.java

// 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.shaking.AppInfoWithLiveness;
import com.android.tools.r8.utils.Action;

public class BottomPrimitiveTypeValueState extends BottomValueState {

  private static final BottomPrimitiveTypeValueState INSTANCE = new BottomPrimitiveTypeValueState();

  private BottomPrimitiveTypeValueState() {}

  public static BottomPrimitiveTypeValueState get() {
    return INSTANCE;
  }

  @Override
  public ValueState mutableJoin(
      AppView<AppInfoWithLiveness> appView,
      ValueState state,
      DexType staticType,
      StateCloner cloner,
      Action onChangedAction) {
    if (state.isBottom()) {
      assert state == bottomPrimitiveTypeState();
      return this;
    }
    if (state.isUnknown()) {
      return state;
    }
    assert state.isPrimitiveState();
    return cloner.mutableCopy(state);
  }
}