https://www.graalvm.org/ 
class com.oracle.truffle.tools.profiler.CPUTracer$3 implements com.oracle.truffle.api.instrumentation.ExecutionEventNodeFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.tools.profiler.CPUTracer$3
  super_class: java.lang.Object
{
  final com.oracle.truffle.tools.profiler.CPUTracer this$0;
    descriptor: Lcom/oracle/truffle/tools/profiler/CPUTracer;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.tools.profiler.CPUTracer);
    descriptor: (Lcom/oracle/truffle/tools/profiler/CPUTracer;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.tools.profiler.CPUTracer$3 this
         0: .line 192
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.tools.profiler.CPUTracer$3.this$0:Lcom/oracle/truffle/tools/profiler/CPUTracer;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.tools.profiler.CPUTracer$3 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/tools/profiler/CPUTracer$3;
    MethodParameters:
        Name  Flags
      this$0  final

  public com.oracle.truffle.api.instrumentation.ExecutionEventNode create(com.oracle.truffle.api.instrumentation.EventContext);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/EventContext;)Lcom/oracle/truffle/api/instrumentation/ExecutionEventNode;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // com.oracle.truffle.tools.profiler.CPUTracer$3 this
        start local 1 // com.oracle.truffle.api.instrumentation.EventContext context
         0: .line 195
            new com.oracle.truffle.tools.profiler.CPUTracer$CounterNode
            dup
            aload 0 /* this */
            getfield com.oracle.truffle.tools.profiler.CPUTracer$3.this$0:Lcom/oracle/truffle/tools/profiler/CPUTracer;
            aload 1 /* context */
            invokevirtual com.oracle.truffle.tools.profiler.CPUTracer.getCounter:(Lcom/oracle/truffle/api/instrumentation/EventContext;)Lcom/oracle/truffle/tools/profiler/CPUTracer$Payload;
            invokespecial com.oracle.truffle.tools.profiler.CPUTracer$CounterNode.<init>:(Lcom/oracle/truffle/tools/profiler/CPUTracer$Payload;)V
            areturn
        end local 1 // com.oracle.truffle.api.instrumentation.EventContext context
        end local 0 // com.oracle.truffle.tools.profiler.CPUTracer$3 this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0     this  Lcom/oracle/truffle/tools/profiler/CPUTracer$3;
            0    1     1  context  Lcom/oracle/truffle/api/instrumentation/EventContext;
    MethodParameters:
         Name  Flags
      context  
}
SourceFile: "CPUTracer.java"
EnclosingMethod: com.oracle.truffle.tools.profiler.CPUTracer.resetTracer:()V
NestHost: com.oracle.truffle.tools.profiler.CPUTracer
InnerClasses:
  com.oracle.truffle.tools.profiler.CPUTracer$3
  private CounterNode = com.oracle.truffle.tools.profiler.CPUTracer$CounterNode of com.oracle.truffle.tools.profiler.CPUTracer
  public final Payload = com.oracle.truffle.tools.profiler.CPUTracer$Payload of com.oracle.truffle.tools.profiler.CPUTracer