content: /*
   * 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;
  import libcore.util.NativeAllocationRegistry;
  
  /**
   * 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 char[] charArray = "char thing".toCharArray();
      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 byte[] bigArray;
  
      DumpedStuff() {
        int N = 1000000;
        bigArray = new byte[N];
        for (int i = 0; i < N; i++) {
          bigArray[i] = (byte)((i*i) & 0xFF);
        }
  
        NativeAllocationRegistry registry = new NativeAllocationRegistry(
            Main.class.getClassLoader(), 0x12345, 42);
        registry.registerNativeAllocation(anObject, 0xABCDABCD);
      }
    }
  
    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);
    }
  }
  