https://openjdk.java.net/ 
public interface org.graalvm.compiler.nodes.spi.GCProvider
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.graalvm.compiler.nodes.spi.GCProvider
  super_class: java.lang.Object
{
  public abstract org.graalvm.compiler.nodes.gc.BarrierSet getBarrierSet();
    descriptor: ()Lorg/graalvm/compiler/nodes/gc/BarrierSet;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "GCProvider.java"