test/lib/sun/hotspot/WhiteBox.java

*** 25,34 ****
--- 25,35 ----
  package sun.hotspot;
  
  import java.lang.management.MemoryUsage;
  import java.lang.reflect.Executable;
  import java.util.Arrays;
+ import java.util.ArrayList;
  import java.util.List;
  import java.util.function.BiFunction;
  import java.util.function.Function;
  import java.security.BasicPermission;
  import java.util.Objects;
*** 151,160 ****
--- 152,203 ----
    public         void addToSystemClassLoaderSearch(String segment) {
      Objects.requireNonNull(segment);
      addToSystemClassLoaderSearch0(segment);
    }
  
+   // GC
+   /**
+    * @returns true if GC was selected by ergonomic
+    */
+   public boolean gcSelectedByErgo() {
+     if (getSupportedGC().size() < 2) {      
+       return false; // nothing to choose from
+     } else {
+       return gcSelectedByErgo0();
+     }
+   }
+   private native boolean gcSelectedByErgo0();
+ 
+   /**
+    * @return name of the selected GC
+    */
+   public native String getGC();
+   private native boolean supportsSerialGC();
+   private native boolean supportsParallelGC();
+   private native boolean supportsConcMarkSweepGC();
+   private native boolean supportsG1GC();
+ 
+   /**
+    * @return names of GC supported by the VM
+    */
+   public List<String> getSupportedGC() {
+     List<String> list = new ArrayList<>();
+     if (supportsSerialGC()) {
+         list.add("Serial");
+     }
+     if (supportsParallelGC()) {
+         list.add("Parallel");
+     }
+     if (supportsConcMarkSweepGC()) {
+         list.add("ConcMarkSweep");
+     }
+     if (supportsG1GC()) {
+         list.add("G1");
+     }
+     return list;
+   }
+ 
    // G1
    public native boolean g1InConcurrentMark();
    private native boolean g1IsHumongous0(Object o);
    public         boolean g1IsHumongous(Object o) {
      Objects.requireNonNull(o);