https://www.graalvm.org/ 
final class com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject implements com.oracle.truffle.api.interop.TruffleObject
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject
  super_class: java.lang.Object
{
  private final com.oracle.truffle.api.CallTarget target;
    descriptor: Lcom/oracle/truffle/api/CallTarget;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  void <init>(com.oracle.truffle.api.CallTarget);
    descriptor: (Lcom/oracle/truffle/api/CallTarget;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject this
        start local 1 // com.oracle.truffle.api.CallTarget target
         0: .line 276
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 277
            aload 0 /* this */
            aload 1 /* target */
            putfield com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject.target:Lcom/oracle/truffle/api/CallTarget;
         2: .line 278
            return
        end local 1 // com.oracle.truffle.api.CallTarget target
        end local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lcom/oracle/truffle/js/test/polyglot/InnerContextTest$ExecutableObject;
            0    3     1  target  Lcom/oracle/truffle/api/CallTarget;
    MethodParameters:
        Name  Flags
      target  

  static boolean isExecutable(com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject);
    descriptor: (Lcom/oracle/truffle/js/test/polyglot/InnerContextTest$ExecutableObject;)Z
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject obj
         0: .line 282
            aload 0 /* obj */
            getfield com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject.target:Lcom/oracle/truffle/api/CallTarget;
            ifnull 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject obj
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0   obj  Lcom/oracle/truffle/js/test/polyglot/InnerContextTest$ExecutableObject;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    MethodParameters:
      Name  Flags
      obj   

  static java.lang.Object execute(com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject, java.lang.Object[]);
    descriptor: (Lcom/oracle/truffle/js/test/polyglot/InnerContextTest$ExecutableObject;[Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject obj
        start local 1 // java.lang.Object[] args
         0: .line 287
            aload 0 /* obj */
            getfield com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject.target:Lcom/oracle/truffle/api/CallTarget;
            aload 1 /* args */
            invokeinterface com.oracle.truffle.api.CallTarget.call:([Ljava/lang/Object;)Ljava/lang/Object;
            astore 2 /* res */
        start local 2 // java.lang.Object res
         1: .line 288
            aload 2 /* res */
            ifnonnull 2
            new com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject
            dup
            aconst_null
            invokespecial com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject.<init>:(Lcom/oracle/truffle/api/CallTarget;)V
            goto 3
      StackMap locals: java.lang.Object
      StackMap stack:
         2: aload 2 /* res */
      StackMap locals:
      StackMap stack: java.lang.Object
         3: areturn
        end local 2 // java.lang.Object res
        end local 1 // java.lang.Object[] args
        end local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject obj
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0   obj  Lcom/oracle/truffle/js/test/polyglot/InnerContextTest$ExecutableObject;
            0    4     1  args  [Ljava/lang/Object;
            1    4     2   res  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    MethodParameters:
      Name  Flags
      obj   
      args  

  static boolean isNull(com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject);
    descriptor: (Lcom/oracle/truffle/js/test/polyglot/InnerContextTest$ExecutableObject;)Z
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject obj
         0: .line 293
            aload 0 /* obj */
            getfield com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject.target:Lcom/oracle/truffle/api/CallTarget;
            ifnonnull 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject obj
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0   obj  Lcom/oracle/truffle/js/test/polyglot/InnerContextTest$ExecutableObject;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    MethodParameters:
      Name  Flags
      obj   
}
SourceFile: "InnerContextTest.java"
NestHost: com.oracle.truffle.js.test.polyglot.InnerContextTest
InnerClasses:
  final ExecutableObject = com.oracle.truffle.js.test.polyglot.InnerContextTest$ExecutableObject of com.oracle.truffle.js.test.polyglot.InnerContextTest
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportLibrary(value = Lcom/oracle/truffle/api/interop/InteropLibrary;)