Main.java

// Decompiled by Jad v1.5.8e. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/kpdus/jad.html
// Decompiler options: packimports(3) 
// Source File Name:   test.scala

package dynamic;


// Referenced classes of package dynamic:
//            Sample

public class Main
{

    public void main(String args[])
    {
        Sample s = new Sample();
        s.cap("hoge");
    }

    public Main()
    {
    }
}

mymacro.scala

// taken from: http://stackoverflow.com/questions/15653550/calling-instance-method-in-macro-implementation-for-selectdynamic

package mymacro

import scala.reflect.macros.blackbox.Context

object MyMacros {
  def selectDynamic(c: Context)(name: c.Expr[String]): c.Expr[String] = {
    import c.universe._
    c.Expr[String](Apply(Select(c.prefix.tree, newTermName("cap")), List(name.tree)))
  }
}

test.scala

// taken from: http://stackoverflow.com/questions/15653550/calling-instance-method-in-macro-implementation-for-selectdynamic

package dynamic

import language.dynamics
import scala.language.experimental.macros

class Sample extends Dynamic {
  def cap(name: String): String = name.toUpperCase
  def selectDynamic(name: String): String = macro mymacro.MyMacros.selectDynamic
}

class Main {
  def main(args: Array[String]) {
    val s = new Sample
    s.hoge
  }
}