Disassemble Hello.scala

console.txt

[k.mizushima]$ javap -c Hello    
Compiled from "Hello.scala"
public class Hello {
  public int return100();
    Code:
       0: new           #4                  // class java/lang/Object
       3: dup
       4: invokespecial #26                 // Method java/lang/Object."<init>":()V
       7: astore_1
       8: getstatic     #32                 // Field scala/runtime/RichInt$.MODULE$:Lscala/runtime/RichInt$;
      11: getstatic     #37                 // Field scala/Predef$.MODULE$:Lscala/Predef$;
      14: iconst_1
      15: invokevirtual #41                 // Method scala/Predef$.intWrapper:(I)I
      18: sipush        1000
      21: invokevirtual #45                 // Method scala/runtime/RichInt$.to$extension0:(II)Lscala/collection/immutable/Range$Inclusive;
      24: aload_1
      25: invokedynamic #67,  0             // InvokeDynamic #0:apply$mcVI$sp:(Ljava/lang/Object;)Lscala/runtime/java8/JFunction1$mcVI$sp;
      30: invokevirtual #71                 // Method scala/collection/immutable/Range$Inclusive.foreach$mVc$sp:(Lscala/Function1;)V
      33: iconst_0
      34: goto          58
      37: astore_2
      38: aload_2
      39: invokevirtual #75                 // Method scala/runtime/NonLocalReturnControl.key:()Ljava/lang/Object;
      42: aload_1
      43: if_acmpne     53
      46: aload_2
      47: invokevirtual #78                 // Method scala/runtime/NonLocalReturnControl.value$mcI$sp:()I
      50: goto          55
      53: aload_2
      54: athrow
      55: goto          58
      58: ireturn
    Exception table:
       from    to  target type
           8    34    37   Class scala/runtime/NonLocalReturnControl

  public static final void $anonfun$return100$1(java.lang.Object, int);
    Code:
       0: iload_1
       1: bipush        100
       3: if_icmpne     17
       6: new           #86                 // class scala/runtime/NonLocalReturnControl$mcI$sp
       9: dup
      10: aload_0
      11: bipush        100
      13: invokespecial #88                 // Method scala/runtime/NonLocalReturnControl$mcI$sp."<init>":(Ljava/lang/Object;I)V
      16: athrow
      17: return

  public Hello();
    Code:
       0: aload_0
       1: invokespecial #26                 // Method java/lang/Object."<init>":()V
       4: return
}

Hello.scala

class Hello {
  def return100: Int = {
    for(i <- 1 to 1000) 
      if(i == 100) return 100
    0
  }
}