https://www.graalvm.org/ 
class com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Unary extends com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Expression
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Unary
  super_class: com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Expression
{
  private com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Expression child0;
    descriptor: Lcom/oracle/truffle/api/benchmark/NodeAdoptionBenchmark$Expression;
    flags: (0x0002) ACC_PRIVATE
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.nodes.Node$Child()

  void <init>(com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Expression);
    descriptor: (Lcom/oracle/truffle/api/benchmark/NodeAdoptionBenchmark$Expression;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Unary this
        start local 1 // com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Expression child0
         0: .line 170
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Expression.<init>:()V
         1: .line 171
            aload 0 /* this */
            aload 1 /* child0 */
            putfield com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Unary.child0:Lcom/oracle/truffle/api/benchmark/NodeAdoptionBenchmark$Expression;
         2: .line 172
            return
        end local 1 // com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Expression child0
        end local 0 // com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Unary this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lcom/oracle/truffle/api/benchmark/NodeAdoptionBenchmark$Unary;
            0    3     1  child0  Lcom/oracle/truffle/api/benchmark/NodeAdoptionBenchmark$Expression;
    MethodParameters:
        Name  Flags
      child0  
}
SourceFile: "NodeAdoptionBenchmark.java"
NestHost: com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark
InnerClasses:
  private Expression = com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Expression of com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark
  private Unary = com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark$Unary of com.oracle.truffle.api.benchmark.NodeAdoptionBenchmark
  public abstract Child = com.oracle.truffle.api.nodes.Node$Child of com.oracle.truffle.api.nodes.Node