https://www.graalvm.org/ 
public final class com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys implements com.oracle.truffle.api.interop.TruffleObject
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys
  super_class: java.lang.Object
{
  private final java.lang.Object[] keys;
    descriptor: [Ljava/lang/Object;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  void <init>(java.util.Map<java.lang.String, java.lang.Object>);
    descriptor: (Ljava/util/Map;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys this
        start local 1 // java.util.Map from
         0: .line 57
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 58
            aload 0 /* this */
            aload 1 /* from */
            invokeinterface java.util.Map.keySet:()Ljava/util/Set;
            invokeinterface java.util.Set.toArray:()[Ljava/lang/Object;
            putfield com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys.keys:[Ljava/lang/Object;
         2: .line 59
            return
        end local 1 // java.util.Map from
        end local 0 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/js/nodes/instrumentation/NodeObjectDescriptorKeys;
            0    3     1  from  Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;
    Signature: (Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;)V
    MethodParameters:
      Name  Flags
      from  

  boolean hasArrayElements();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys this
         0: .line 64
            iconst_1
            ireturn
        end local 0 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/nodes/instrumentation/NodeObjectDescriptorKeys;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()

  long getArraySize();
    descriptor: ()J
    flags: (0x0000) 
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys this
         0: .line 69
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys.keys:[Ljava/lang/Object;
            arraylength
            i2l
            lreturn
        end local 0 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/nodes/instrumentation/NodeObjectDescriptorKeys;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()

  boolean isArrayElementReadable(long);
    descriptor: (J)Z
    flags: (0x0000) 
    Code:
      stack=4, locals=3, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys this
        start local 1 // long index
         0: .line 74
            lload 1 /* index */
            lconst_0
            lcmp
            iflt 1
            lload 1 /* index */
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys.getArraySize:()J
            lcmp
            ifge 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 1 // long index
        end local 0 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0   this  Lcom/oracle/truffle/js/nodes/instrumentation/NodeObjectDescriptorKeys;
            0    2     1  index  J
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    MethodParameters:
       Name  Flags
      index  

  java.lang.Object readArrayElement(long);
    descriptor: (J)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys this
        start local 1 // long index
         0: .line 80
            aload 0 /* this */
            lload 1 /* index */
            invokevirtual com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys.isArrayElementReadable:(J)Z
            ifne 2
         1: .line 81
            lload 1 /* index */
            invokestatic com.oracle.truffle.api.interop.InvalidArrayIndexException.create:(J)Lcom/oracle/truffle/api/interop/InvalidArrayIndexException;
            athrow
         2: .line 83
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys.keys:[Ljava/lang/Object;
            lload 1 /* index */
            l2i
            aaload
            areturn
        end local 1 // long index
        end local 0 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptorKeys this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lcom/oracle/truffle/js/nodes/instrumentation/NodeObjectDescriptorKeys;
            0    3     1  index  J
    Exceptions:
      throws com.oracle.truffle.api.interop.InvalidArrayIndexException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
       Name  Flags
      index  
}
SourceFile: "NodeObjectDescriptorKeys.java"
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportLibrary(value = Lcom/oracle/truffle/api/interop/InteropLibrary;)