src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/VM.java

*** 146,10 ***
--- 146,11 ---
    private static Type uint64tType;
    private static CIntegerType boolType;
    private Boolean sharingEnabled;
    private Boolean compressedOopsEnabled;
    private Boolean compressedKlassPointersEnabled;
+   private Boolean compactObjectHeadersEnabled;
  
    // command line flags supplied to VM - see struct JVMFlag in jvmFlag.hpp
    public static final class Flag {
       private String type;
       private String name;

*** 958,10 ***
--- 959,19 ---
               (flag.getBool()? Boolean.TRUE: Boolean.FALSE);
      }
      return compressedKlassPointersEnabled.booleanValue();
    }
  
+   public boolean isCompactObjectHeadersEnabled() {
+     if (compactObjectHeadersEnabled == null) {
+         Flag flag = getCommandLineFlag("UseCompactObjectHeaders");
+         compactObjectHeadersEnabled = (flag == null) ? Boolean.FALSE:
+              (flag.getBool()? Boolean.TRUE: Boolean.FALSE);
+     }
+     return compactObjectHeadersEnabled.booleanValue();
+   }
+ 
    public int getObjectAlignmentInBytes() {
      if (objectAlignmentInBytes == 0) {
          Flag flag = getCommandLineFlag("ObjectAlignmentInBytes");
          objectAlignmentInBytes = (flag == null) ? 8 : (int)flag.getInt();
      }