content: /*
   * Copyright (C) 2009 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 java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  
  public class Main {
      static class ArrayMemEater {
          static boolean sawOome;
  
          static void blowup(char[][] holder) {
              try {
                  for (int i = 0; i < holder.length; ++i) {
                      holder[i] = new char[1024 * 1024];
                  }
              } catch (OutOfMemoryError oome) {
                  ArrayMemEater.sawOome = true;
              }
          }
      }
  
      static class InstanceMemEater {
          static boolean sawOome;
          static InstanceMemEater hook;
  
          InstanceMemEater next;
          double d1, d2, d3, d4, d5, d6, d7, d8; // Bloat this object so we fill the heap faster.
  
          static InstanceMemEater allocate() {
              try {
                  return new InstanceMemEater();
              } catch (OutOfMemoryError e) {
                  InstanceMemEater.sawOome = true;
                  return null;
              }
          }
  
          static void confuseCompilerOptimization(InstanceMemEater instance) {
            hook = instance;
          }
      }
  
      static boolean triggerArrayOOM() {
          ArrayMemEater.blowup(new char[128 * 1024][]);
          return ArrayMemEater.sawOome;
      }
  
      static boolean triggerInstanceOOM() {
          InstanceMemEater memEater = InstanceMemEater.allocate();
          InstanceMemEater lastMemEater = memEater;
          do {
              lastMemEater.next = InstanceMemEater.allocate();
              lastMemEater = lastMemEater.next;
          } while (lastMemEater != null);
          memEater.confuseCompilerOptimization(memEater);
          InstanceMemEater.hook = null;
          return InstanceMemEater.sawOome;
      }
  
      public static void main(String[] args) {
          if (triggerReflectionOOM()) {
              System.out.println("Test reflection correctly threw");
          }
  
          if (triggerArrayOOM()) {
              System.out.println("NEW_ARRAY correctly threw OOME");
          }
  
          if (triggerInstanceOOM()) {
              System.out.println("NEW_INSTANCE correctly threw OOME");
          }
      }
  
      static Object[] holder;
  
      public static void blowup() throws Exception {
          int size = 32 * 1024 * 1024;
          for (int i = 0; i < holder.length; ) {
              try {
                  holder[i] = new char[size];
                  i++;
              } catch (OutOfMemoryError oome) {
                  size = size / 2;
                  if (size == 0) {
                       break;
                  }
              }
          }
          holder[0] = new char[100000];
      }
  
      static boolean triggerReflectionOOM() {
          try {
              Class<?> c = Main.class;
              Method m = c.getMethod("blowup", (Class[]) null);
              holder = new Object[1000000];
              m.invoke(null);
              holder = null;
              System.out.println("Didn't throw from blowup");
          } catch (OutOfMemoryError e) {
              holder = null;
          } catch (InvocationTargetException e) {
              holder = null;
              if (!(e.getCause() instanceof OutOfMemoryError)) {
                  System.out.println("InvocationTargetException cause not OOME " + e.getCause());
                  return false;
              }
          } catch (Exception e) {
              holder = null;
              System.out.println("Unexpected exception " + e);
              return false;
          }
          return true;
      }
  }
  