https://www.graalvm.org/ 
class com.oracle.truffle.api.nodes.NodeSnippets$1InstrumentableLanguageNode extends com.oracle.truffle.api.nodes.Node
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.nodes.NodeSnippets$1InstrumentableLanguageNode
  super_class: com.oracle.truffle.api.nodes.Node
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.nodes.NodeSnippets$1InstrumentableLanguageNode this
         0: .line 920
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.nodes.Node.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.nodes.NodeSnippets$1InstrumentableLanguageNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/nodes/NodeSnippets$1InstrumentableLanguageNode;

  java.lang.Object execute(com.oracle.truffle.api.frame.VirtualFrame);
    descriptor: (Lcom/oracle/truffle/api/frame/VirtualFrame;)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.nodes.NodeSnippets$1InstrumentableLanguageNode this
        start local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
         0: .line 922
            aconst_null
            areturn
        end local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 0 // com.oracle.truffle.api.nodes.NodeSnippets$1InstrumentableLanguageNode this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lcom/oracle/truffle/api/nodes/NodeSnippets$1InstrumentableLanguageNode;
            0    1     1  frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
    MethodParameters:
       Name  Flags
      frame  
}
SourceFile: "Node.java"
EnclosingMethod: com.oracle.truffle.api.nodes.NodeSnippets.notifyInserted:()V
NestHost: com.oracle.truffle.api.nodes.NodeSnippets
InnerClasses:
  InstrumentableLanguageNode = com.oracle.truffle.api.nodes.NodeSnippets$1InstrumentableLanguageNode