content: /*
   * 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.
   */
  
  public class Main {
    static volatile boolean done = false;
  
    public static void main(String[] args) {
      // Run a thread for 30 seconds, allocating memory and triggering garbage
      // collection.
      // Time is limited to 30 seconds to not make this test too long. The test used
      // to trigger the failure around 1 every 10 runs.
      Thread t = new Thread() {
        public void run() {
          long time = System.currentTimeMillis();
          while (System.currentTimeMillis() - time < 30000) {
            for (int j = 0; j < 10000; j++) {
              o = new Object[1000];
            }
            Runtime.getRuntime().gc();
            Thread.yield();
          }
          Main.done = true;
        }
        Object o;
      };
      // Make the thread a daemon to quit early in case of an
      // exception throw below.
      t.setDaemon(true);
      t.start();
  
      // Run 'foo' as long as the test runs.
      while (!done) {
        double res = foo(staticMain);
        if (res != 529.0) {
          throw new Error("Unexpected result " + res);
        }
      }
    }
  
    public static double foo(Main main) {
      // Use up all D registers on arm64.
      double d1 = main.field1;
      double d2 = main.field2;
      double d3 = main.field3;
      double d4 = main.field4;
      double d5 = main.field5;
      double d6 = main.field6;
      double d7 = main.field7;
      double d8 = main.field8;
      double d9 = main.field9;
      double d10 = main.field10;
      double d11 = main.field11;
      double d12 = main.field12;
      double d13 = main.field13;
      double d14 = main.field14;
      double d15 = main.field15;
      double d16 = main.field16;
      double d17 = main.field17;
      double d18 = main.field18;
      double d19 = main.field19;
      double d20 = main.field20;
      double d21 = main.field21;
      double d22 = main.field22;
      double d23 = main.field23;
      double d24 = main.field24;
      double d25 = main.field25;
      double d26 = main.field26;
      double d27 = main.field27;
      double d28 = main.field28;
      double d29 = main.field29;
      double d30 = main.field30;
      double d31 = main.field31;
      double d32 = main.field32;
  
      // Trigger a read barrier. This used to make the test trip on ARM64 as
      // the read barrier stub used to not restore the D registers.
      double p = main.objectField.field1;
  
      return p + d1 + d2 + d3 + d4 + d5 + d6 + d7 + d8 + d9 + d10 + d11 + d12 + d13 + d14 + d15 + d16 + d17 + d18 + d19 + d20 + d21 + d22 + d23 + d24 + d25 + d26 + d27 + d28 + d29 + d30 + d31 + d32;
    }
  
    // Initialize objects here and not in 'main' to avoid having
    // these objects in roots.
    public static Main staticMain = new Main();
    static {
      staticMain.objectField = new Main();
    }
  
    public Main objectField;
  
    public double field1 = 1.0;
    public double field2 = 2.0;
    public double field3 = 3.0;
    public double field4 = 4.0;
    public double field5 = 5.0;
    public double field6 = 6.0;
    public double field7 = 7.0;
    public double field8 = 8.0;
    public double field9 = 9.0;
    public double field10 = 10.0;
    public double field11 = 11.0;
    public double field12 = 12.0;
    public double field13 = 13.0;
    public double field14 = 14.0;
    public double field15 = 15.0;
    public double field16 = 16.0;
    public double field17 = 17.0;
    public double field18 = 18.0;
    public double field19 = 19.0;
    public double field20 = 20.0;
    public double field21 = 21.0;
    public double field22 = 22.0;
    public double field23 = 23.0;
    public double field24 = 24.0;
    public double field25 = 25.0;
    public double field26 = 26.0;
    public double field27 = 27.0;
    public double field28 = 28.0;
    public double field29 = 29.0;
    public double field30 = 30.0;
    public double field31 = 31.0;
    public double field32 = 32.0;
  }
  