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. 
public final class org.graalvm.nativeimage.c.struct.SizeOf
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.graalvm.nativeimage.c.struct.SizeOf
  super_class: java.lang.Object
{
  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.graalvm.nativeimage.c.struct.SizeOf this
         0: .line 58
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 59
            return
        end local 0 // org.graalvm.nativeimage.c.struct.SizeOf this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/graalvm/nativeimage/c/struct/SizeOf;

  public static int get(java.lang.Class<? extends org.graalvm.word.PointerBase>);
    descriptor: (Ljava/lang/Class;)I
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // java.lang.Class clazz
         0: .line 68
            ldc Lorg/graalvm/nativeimage/impl/SizeOfSupport;
            invokestatic org.graalvm.nativeimage.ImageSingletons.lookup:(Ljava/lang/Class;)Ljava/lang/Object;
            checkcast org.graalvm.nativeimage.impl.SizeOfSupport
            aload 0 /* clazz */
            invokeinterface org.graalvm.nativeimage.impl.SizeOfSupport.sizeof:(Ljava/lang/Class;)I
            ireturn
        end local 0 // java.lang.Class clazz
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0  clazz  Ljava/lang/Class<+Lorg/graalvm/word/PointerBase;>;
    Signature: (Ljava/lang/Class<+Lorg/graalvm/word/PointerBase;>;)I
    MethodParameters:
       Name  Flags
      clazz  

  public static org.graalvm.word.UnsignedWord unsigned(java.lang.Class<? extends org.graalvm.word.PointerBase>);
    descriptor: (Ljava/lang/Class;)Lorg/graalvm/word/UnsignedWord;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // java.lang.Class clazz
         0: .line 77
            aload 0 /* clazz */
            invokestatic org.graalvm.nativeimage.c.struct.SizeOf.get:(Ljava/lang/Class;)I
            invokestatic org.graalvm.word.WordFactory.unsigned:(I)Lorg/graalvm/word/UnsignedWord;
            areturn
        end local 0 // java.lang.Class clazz
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0  clazz  Ljava/lang/Class<+Lorg/graalvm/word/PointerBase;>;
    Signature: (Ljava/lang/Class<+Lorg/graalvm/word/PointerBase;>;)Lorg/graalvm/word/UnsignedWord;
    MethodParameters:
       Name  Flags
      clazz  
}
SourceFile: "SizeOf.java"