https://openjdk.java.net/ 
public interface org.graalvm.compiler.lir.StandardOp$RestoreRegistersOp
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.graalvm.compiler.lir.StandardOp$RestoreRegistersOp
  super_class: java.lang.Object
{
}
SourceFile: "StandardOp.java"
NestHost: org.graalvm.compiler.lir.StandardOp
InnerClasses:
  public abstract RestoreRegistersOp = org.graalvm.compiler.lir.StandardOp$RestoreRegistersOp of org.graalvm.compiler.lir.StandardOp