| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package dalvik.system; |
| |
| import libcore.util.NonNull; |
| import libcore.util.Nullable; |
| |
| /** |
| * A class encapsulating a StackTraceElement and lock state. This adds |
| * critical thread state to the standard stack trace information, which |
| * can be used to detect deadlocks at the Java level. |
| * |
| * @hide |
| */ |
| @libcore.api.CorePlatformApi(status = libcore.api.CorePlatformApi.Status.STABLE) |
| public final class AnnotatedStackTraceElement { |
| /** |
| * The traditional StackTraceElement describing the Java stack frame. |
| */ |
| private StackTraceElement stackTraceElement; |
| |
| /** |
| * An array containing objects that are locked in this frame. May be null. |
| */ |
| private Object[] heldLocks; |
| |
| /** |
| * If this frame denotes the top of stack, {@code blockedOn} will hold |
| * the object this thread is waiting to lock, or waiting on, if any. May be |
| * null. |
| */ |
| private Object blockedOn; |
| |
| // Internal allocation, only. |
| private AnnotatedStackTraceElement() { |
| } |
| |
| /** |
| * Returns the {@link StackTraceElement} describing the Java stack frame. |
| * |
| * @return {@link StackTraceElement} describing the Java stack frame. |
| */ |
| @libcore.api.CorePlatformApi(status = libcore.api.CorePlatformApi.Status.STABLE) |
| @NonNull public StackTraceElement getStackTraceElement() { |
| return stackTraceElement; |
| } |
| |
| /** |
| * Returns the objects this stack frame is synchronized on. |
| * May be {@code null}. |
| * |
| * @return array of objects current frame is syncronized on. |
| */ |
| @libcore.api.CorePlatformApi(status = libcore.api.CorePlatformApi.Status.STABLE) |
| @Nullable public Object[] getHeldLocks() { |
| return heldLocks; |
| } |
| |
| /** |
| * Returns the object this stack frame is waiting on for synchronization. |
| * May be {@code null}. |
| * |
| * @return object this thread is waiting to lock, or waiting on, if any, |
| * or {@code null}, if none. |
| */ |
| @libcore.api.CorePlatformApi(status = libcore.api.CorePlatformApi.Status.STABLE) |
| @Nullable public Object getBlockedOn() { |
| return blockedOn; |
| } |
| } |