// 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.ir.analysis.fieldaccess.state;

import com.android.tools.r8.ir.analysis.value.AbstractValue;
import com.android.tools.r8.ir.analysis.value.AbstractValueFactory;

/** Used to represent the state for fields that have never been assigned in the program. */
public class BottomFieldState extends FieldState {

  private static final BottomFieldState INSTANCE = new BottomFieldState();

  private BottomFieldState() {}

  public static BottomFieldState getInstance() {
    return INSTANCE;
  }

  @Override
  public AbstractValue getAbstractValue(AbstractValueFactory abstractValueFactory) {
    return abstractValueFactory.createNullValue();
  }

  @Override
  public boolean isBottom() {
    return true;
  }
}