https://github.com/oracle/graal: GraalVM is an ecosystem for compiling and running applications written in multiple languages. GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime. 
interface org.graalvm.nativeimage.StackValueSnippets$IntOrDouble extends org.graalvm.word.PointerBase
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.graalvm.nativeimage.StackValueSnippets$IntOrDouble
  super_class: java.lang.Object
{
  public abstract org.graalvm.nativeimage.StackValueSnippets$IntOrDouble addressOf(int);
    descriptor: (I)Lorg/graalvm/nativeimage/StackValueSnippets$IntOrDouble;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      index  

  public abstract int i();
    descriptor: ()I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    RuntimeVisibleAnnotations: 
      org.graalvm.nativeimage.c.struct.CField()

  public abstract void i(int);
    descriptor: (I)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    RuntimeVisibleAnnotations: 
      org.graalvm.nativeimage.c.struct.CField()
    MethodParameters:
      Name  Flags
      i     

  public abstract double d();
    descriptor: ()D
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    RuntimeVisibleAnnotations: 
      org.graalvm.nativeimage.c.struct.CField()

  public abstract void d(double);
    descriptor: (D)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    RuntimeVisibleAnnotations: 
      org.graalvm.nativeimage.c.struct.CField()
    MethodParameters:
      Name  Flags
      d     
}
SourceFile: "StackValue.java"
NestHost: org.graalvm.nativeimage.StackValueSnippets
InnerClasses:
  abstract IntOrDouble = org.graalvm.nativeimage.StackValueSnippets$IntOrDouble of org.graalvm.nativeimage.StackValueSnippets
    RuntimeVisibleAnnotations: 
      org.graalvm.nativeimage.c.struct.CStruct(value = "int_double")