26 import java.lang.Class;
  27 import java.lang.String;
  28 import java.lang.System;
  29 import java.lang.management.ManagementFactory;
  30 import java.lang.management.RuntimeMXBean;
  31 import java.util.ArrayList;
  32 import java.util.List;
  33 import java.util.concurrent.CyclicBarrier;
  34 import java.util.regex.Matcher;
  35 import java.util.regex.Pattern;
  36 import java.lang.reflect.Field;
  37 import java.lang.reflect.Modifier;
  38 import sun.misc.Unsafe;
  39 import jdk.internal.vm.annotation.Contended;
  40 
  41 /*
  42  * @test
  43  * @bug     8014509
  44  * @summary \@Contended: explicit default value behaves differently from the implicit value
  45  *
  46  * @modules java.base/sun.misc
  47  * @run main/othervm -XX:-RestrictContended DefaultValue
  48  */
  49 public class DefaultValue {
  50 
  51     private static final Unsafe U;
  52     private static int ADDRESS_SIZE;
  53     private static int HEADER_SIZE;
  54 
  55     static {
  56         // steal Unsafe
  57         try {
  58             Field unsafe = Unsafe.class.getDeclaredField("theUnsafe");
  59             unsafe.setAccessible(true);
  60             U = (Unsafe) unsafe.get(null);
  61         } catch (NoSuchFieldException | IllegalAccessException e) {
  62             throw new IllegalStateException(e);
  63         }
  64 
  65         // When running with CompressedOops on 64-bit platform, the address size
  66         // reported by Unsafe is still 8, while the real reference fields are 4 bytes long.

  26 import java.lang.Class;
  27 import java.lang.String;
  28 import java.lang.System;
  29 import java.lang.management.ManagementFactory;
  30 import java.lang.management.RuntimeMXBean;
  31 import java.util.ArrayList;
  32 import java.util.List;
  33 import java.util.concurrent.CyclicBarrier;
  34 import java.util.regex.Matcher;
  35 import java.util.regex.Pattern;
  36 import java.lang.reflect.Field;
  37 import java.lang.reflect.Modifier;
  38 import sun.misc.Unsafe;
  39 import jdk.internal.vm.annotation.Contended;
  40 
  41 /*
  42  * @test
  43  * @bug     8014509
  44  * @summary \@Contended: explicit default value behaves differently from the implicit value
  45  *
  46  * @modules java.base/jdk.internal.vm.annotation
  47  * @run main/othervm -XX:-RestrictContended DefaultValue
  48  */
  49 public class DefaultValue {
  50 
  51     private static final Unsafe U;
  52     private static int ADDRESS_SIZE;
  53     private static int HEADER_SIZE;
  54 
  55     static {
  56         // steal Unsafe
  57         try {
  58             Field unsafe = Unsafe.class.getDeclaredField("theUnsafe");
  59             unsafe.setAccessible(true);
  60             U = (Unsafe) unsafe.get(null);
  61         } catch (NoSuchFieldException | IllegalAccessException e) {
  62             throw new IllegalStateException(e);
  63         }
  64 
  65         // When running with CompressedOops on 64-bit platform, the address size
  66         // reported by Unsafe is still 8, while the real reference fields are 4 bytes long.