https://openjdk.java.net/ 
public interface jdk.vm.ci.hotspot.HotSpotConstant extends jdk.vm.ci.meta.Constant
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.vm.ci.hotspot.HotSpotConstant
  super_class: java.lang.Object
{
  public abstract boolean isCompressed();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract jdk.vm.ci.meta.Constant compress();
    descriptor: ()Ljdk/vm/ci/meta/Constant;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract jdk.vm.ci.meta.Constant uncompress();
    descriptor: ()Ljdk/vm/ci/meta/Constant;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "HotSpotConstant.java"