| // Copyright (c) 2017, 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.type; |
| |
| import com.android.tools.r8.graph.AppInfo; |
| import com.android.tools.r8.graph.DexType; |
| |
| public class BottomTypeLatticeElement extends TypeLatticeElement { |
| private static final BottomTypeLatticeElement INSTANCE = new BottomTypeLatticeElement(); |
| |
| private BottomTypeLatticeElement() { |
| super(true); |
| } |
| |
| @Override |
| public TypeLatticeElement asNullable() { |
| return this; |
| } |
| |
| static BottomTypeLatticeElement getInstance() { |
| return INSTANCE; |
| } |
| |
| @Override |
| public boolean isBottom() { |
| return true; |
| } |
| |
| @Override |
| public TypeLatticeElement checkCast(AppInfo appInfo, DexType castType) { |
| return this; |
| } |
| |
| @Override |
| public String toString() { |
| return "BOTTOM (empty)"; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| return this == o; |
| } |
| |
| @Override |
| public int hashCode() { |
| return System.identityHashCode(INSTANCE); |
| } |
| } |