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/*
* 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 static android.annotation.SystemApi.Client.MODULE_LIBRARIES;
import android.annotation.SystemApi;
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
*/
@SystemApi(client = MODULE_LIBRARIES)
@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.
*
* @hide
*/
@SystemApi(client = MODULE_LIBRARIES)
@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.
*
* @hide
*/
@SystemApi(client = MODULE_LIBRARIES)
@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.
*
* @hide
*/
@SystemApi(client = MODULE_LIBRARIES)
@libcore.api.CorePlatformApi(status = libcore.api.CorePlatformApi.Status.STABLE)
@Nullable public Object getBlockedOn() {
return blockedOn;
}
}
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