1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dalvik.system; 18 19 /** 20 * A class encapsulating a StackTraceElement and lock state. This adds 21 * critical thread state to the standard stack trace information, which 22 * can be used to detect deadlocks at the Java level. 23 * 24 * @hide 25 */ 26 public class AnnotatedStackTraceElement { 27 /** 28 * The traditional StackTraceElement describing the Java stack frame. 29 */ 30 private StackTraceElement stackTraceElement; 31 32 /** 33 * An array containing objects that are locked in this frame. May be null. 34 */ 35 private Object[] heldLocks; 36 37 /** 38 * If this frame denotes the top of stack, <code>blockedOn<code> will hold 39 * the object this thread is waiting to lock, or waiting on, if any. May be 40 * null. 41 */ 42 private Object blockedOn; 43 44 // Internal allocation, only. AnnotatedStackTraceElement()45 private AnnotatedStackTraceElement() { 46 } 47 getStackTraceElement()48 public StackTraceElement getStackTraceElement() { 49 return stackTraceElement; 50 } 51 getHeldLocks()52 public Object[] getHeldLocks() { 53 return heldLocks; 54 } 55 getBlockedOn()56 public Object getBlockedOn() { 57 return blockedOn; 58 } 59 } 60