https://www.graalvm.org/ 
public final class com.oracle.truffle.js.runtime.builtins.JSConstructor
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.js.runtime.builtins.JSConstructor
  super_class: java.lang.Object
{
  private final com.oracle.truffle.api.object.DynamicObject constructor;
    descriptor: Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final com.oracle.truffle.api.object.DynamicObject prototype;
    descriptor: Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(com.oracle.truffle.api.object.DynamicObject, com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/api/object/DynamicObject;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSConstructor this
        start local 1 // com.oracle.truffle.api.object.DynamicObject constructor
        start local 2 // com.oracle.truffle.api.object.DynamicObject prototype
         0: .line 50
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 51
            aload 0 /* this */
            aload 1 /* constructor */
            putfield com.oracle.truffle.js.runtime.builtins.JSConstructor.constructor:Lcom/oracle/truffle/api/object/DynamicObject;
         2: .line 52
            aload 0 /* this */
            aload 2 /* prototype */
            putfield com.oracle.truffle.js.runtime.builtins.JSConstructor.prototype:Lcom/oracle/truffle/api/object/DynamicObject;
         3: .line 53
            return
        end local 2 // com.oracle.truffle.api.object.DynamicObject prototype
        end local 1 // com.oracle.truffle.api.object.DynamicObject constructor
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSConstructor this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    4     0         this  Lcom/oracle/truffle/js/runtime/builtins/JSConstructor;
            0    4     1  constructor  Lcom/oracle/truffle/api/object/DynamicObject;
            0    4     2    prototype  Lcom/oracle/truffle/api/object/DynamicObject;
    MethodParameters:
             Name  Flags
      constructor  
      prototype    

  public com.oracle.truffle.api.object.DynamicObject getFunctionObject();
    descriptor: ()Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSConstructor this
         0: .line 56
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.builtins.JSConstructor.constructor:Lcom/oracle/truffle/api/object/DynamicObject;
            areturn
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSConstructor this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/builtins/JSConstructor;

  public com.oracle.truffle.api.object.DynamicObject getPrototype();
    descriptor: ()Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.builtins.JSConstructor this
         0: .line 60
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.builtins.JSConstructor.prototype:Lcom/oracle/truffle/api/object/DynamicObject;
            areturn
        end local 0 // com.oracle.truffle.js.runtime.builtins.JSConstructor this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/builtins/JSConstructor;
}
SourceFile: "JSConstructor.java"