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/*
* Copyright (C) 2015 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.
*/
import dalvik.system.VMDebug;
import java.io.IOException;
import java.lang.ref.PhantomReference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
/**
* Program used to create a heap dump for test purposes.
*/
public class Main {
// Keep a reference to the DumpedStuff instance so that it is not garbage
// collected before we take the heap dump.
public static DumpedStuff stuff;
// We will take a heap dump that includes a single instance of this
// DumpedStuff class. Objects stored as fields in this class can be easily
// found in the hprof dump by searching for the instance of the DumpedStuff
// class and reading the desired field.
public static class DumpedStuff {
public String basicString = "hello, world";
public String nullString = null;
public Object anObject = new Object();
public ReferenceQueue<Object> referenceQueue = new ReferenceQueue<Object>();
public PhantomReference aPhantomReference = new PhantomReference(anObject, referenceQueue);
public WeakReference aWeakReference = new WeakReference(anObject, referenceQueue);
}
public static void main(String[] args) throws IOException {
if (args.length < 1) {
System.err.println("no output file specified");
return;
}
String file = args[0];
// Allocate the instance of DumpedStuff.
stuff = new DumpedStuff();
// Take a heap dump that will include that instance of DumpedStuff.
System.err.println("Dumping hprof data to " + file);
VMDebug.dumpHprofData(file);
}
}
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