Scala structural types implemented with reflection

javap.txt

scala> :javap Greeter -c
Compiled from "<console>"
public class Greeter extends java.lang.Object implements scala.ScalaObject{
public static {};
  Code:
   0:	iconst_0
   1:	anewarray	#8; //class java/lang/Class
   4:	putstatic	#14; //Field reflParams$Cache1:[Ljava/lang/Class;
   7:	new	#16; //class java/lang/ref/SoftReference
   10:	dup
   11:	new	#18; //class scala/runtime/EmptyMethodCache
   14:	dup
   15:	invokespecial	#21; //Method scala/runtime/EmptyMethodCache."<init>":()V
   18:	invokespecial	#24; //Method java/lang/ref/SoftReference."<init>":(Ljava/lang/Object;)V
   21:	putstatic	#28; //Field reflPoly$Cache1:Ljava/lang/ref/SoftReference;
   24:	return

public static java.lang.reflect.Method reflMethod$Method1(java.lang.Class);
  Code:
   0:	getstatic	#28; //Field reflPoly$Cache1:Ljava/lang/ref/SoftReference;
   3:	invokevirtual	#34; //Method java/lang/ref/SoftReference.get:()Ljava/lang/Object;
   6:	checkcast	#36; //class scala/runtime/MethodCache
   9:	ifnonnull	29
   12:	new	#16; //class java/lang/ref/SoftReference
   15:	dup
   16:	new	#18; //class scala/runtime/EmptyMethodCache
   19:	dup
   20:	invokespecial	#21; //Method scala/runtime/EmptyMethodCache."<init>":()V
   23:	invokespecial	#24; //Method java/lang/ref/SoftReference."<init>":(Ljava/lang/Object;)V
   26:	putstatic	#28; //Field reflPoly$Cache1:Ljava/lang/ref/SoftReference;
   29:	getstatic	#28; //Field reflPoly$Cache1:Ljava/lang/ref/SoftReference;
   32:	invokevirtual	#34; //Method java/lang/ref/SoftReference.get:()Ljava/lang/Object;
   35:	checkcast	#36; //class scala/runtime/MethodCache
   38:	aload_0
   39:	invokevirtual	#39; //Method scala/runtime/MethodCache.find:(Ljava/lang/Class;)Ljava/lang/reflect/Method;
   42:	astore_1
   43:	aload_1
   44:	ifnonnull	89
   47:	getstatic	#45; //Field scala/runtime/ScalaRunTime$.MODULE$:Lscala/runtime/ScalaRunTime$;
   50:	aload_0
   51:	ldc	#47; //String name
   53:	getstatic	#14; //Field reflParams$Cache1:[Ljava/lang/Class;
   56:	invokevirtual	#51; //Method java/lang/Class.getMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;
   59:	invokevirtual	#55; //Method scala/runtime/ScalaRunTime$.ensureAccessible:(Ljava/lang/reflect/Method;)Ljava/lang/reflect/Method;
   62:	astore_1
   63:	new	#16; //class java/lang/ref/SoftReference
   66:	dup
   67:	getstatic	#28; //Field reflPoly$Cache1:Ljava/lang/ref/SoftReference;
   70:	invokevirtual	#34; //Method java/lang/ref/SoftReference.get:()Ljava/lang/Object;
   73:	checkcast	#36; //class scala/runtime/MethodCache
   76:	aload_0
   77:	aload_1
   78:	invokevirtual	#59; //Method scala/runtime/MethodCache.add:(Ljava/lang/Class;Ljava/lang/reflect/Method;)Lscala/runtime/MethodCache;
   81:	invokespecial	#24; //Method java/lang/ref/SoftReference."<init>":(Ljava/lang/Object;)V
   84:	putstatic	#28; //Field reflPoly$Cache1:Ljava/lang/ref/SoftReference;
   87:	aload_1
   88:	areturn
   89:	aload_1
   90:	areturn

public java.lang.String greet(java.lang.Object);
  Code:
   0:	getstatic	#69; //Field scala/Predef$.MODULE$:Lscala/Predef$;
   3:	ldc	#71; //String Hello, %s
   5:	invokevirtual	#75; //Method scala/Predef$.augmentString:(Ljava/lang/String;)Lscala/collection/immutable/StringOps;
   8:	getstatic	#69; //Field scala/Predef$.MODULE$:Lscala/Predef$;
   11:	iconst_1
   12:	anewarray	#77; //class java/lang/Object
   15:	dup
   16:	iconst_0
   17:	aload_1
   18:	astore_2
   19:	aconst_null
   20:	astore_3
   21:	aload_2
   22:	invokevirtual	#81; //Method java/lang/Object.getClass:()Ljava/lang/Class;
   25:	invokestatic	#83; //Method reflMethod$Method1:(Ljava/lang/Class;)Ljava/lang/reflect/Method;
   28:	aload_2
   29:	iconst_0
   30:	anewarray	#77; //class java/lang/Object
   33:	invokevirtual	#89; //Method java/lang/reflect/Method.invoke:(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
   36:	astore_3
   37:	aload_3
   38:	checkcast	#91; //class java/lang/String
   41:	aastore
   42:	invokevirtual	#95; //Method scala/Predef$.genericWrapArray:(Ljava/lang/Object;)Lscala/collection/mutable/WrappedArray;
   45:	invokeinterface	#101,  2; //InterfaceMethod scala/collection/immutable/StringLike.format:(Lscala/collection/Seq;)Ljava/lang/String;
   50:	areturn
   51:	astore	4
   53:	aload	4
   55:	invokevirtual	#107; //Method java/lang/reflect/InvocationTargetException.getCause:()Ljava/lang/Throwable;
   58:	athrow
  Exception table:
   from   to  target type
    21    37    51   Class java/lang/reflect/InvocationTargetException


public Greeter();
  Code:
   0:	aload_0
   1:	invokespecial	#114; //Method java/lang/Object."<init>":()V
   4:	return

}