log

[warn] /home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java:1: package <empty> {
[warn]   object JavaTest extends  {
[warn]     def <init>() = _;
[warn]     <static> def main(args: scala.Array[String] = _): Unit = _
[warn]   };
[warn]   class JavaTest extends _root_.java.lang.Object {
[warn]     import JavaTest._;
[warn]     def <init>() = _
[warn]   }
[warn] } source-/home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java,line-1,offset=0
[warn] public class JavaTest
[warn] ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java:1: object JavaTest extends  {
[warn]   def <init>() = _;
[warn]   <static> def main(args: scala.Array[String] = _): Unit = _
[warn] } source-/home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java,line-1,offset=13
[warn] public class JavaTest
[warn]              ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java:3: <static> def main(args: scala.Array[String] = _): Unit = _ source-/home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java,line-3,offset=44
[warn]  public static void main(String[] args)
[warn]                     ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java:3: var args: scala.Array[String] = _ source-/home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java,line-3,offset=58
[warn]  public static void main(String[] args)
[warn]                                   ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java:3: scala.Array[String] source-/home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java,line-3,offset=56
[warn]  public static void main(String[] args)
[warn]                                 ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java:3: String source-/home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java,line-3,offset=49
[warn]  public static void main(String[] args)
[warn]                          ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java:3: Unit source-/home/rainwarrior/minecraft/sc4/plugin-test/JavaTest.java,line-3,offset=45
[warn]  public static void main(String[] args)
[warn]                      ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:1: package <empty> {
[warn]   object Test extends scala.AnyRef {
[warn]     def <init>() = {
[warn]       super.<init>();
[warn]       ()
[warn]     };
[warn]     val five = 5;
[warn]     val amount = five.$div(0);
[warn]     def main(args: Array[String]): scala.Unit = println(amount)
[warn]   }
[warn] } source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-1,offset=7
[warn] object Test {
[warn]        ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:1: scala.AnyRef {
[warn]   def <init>() = {
[warn]     super.<init>();
[warn]     ()
[warn]   };
[warn]   val five = 5;
[warn]   val amount = five.$div(0);
[warn]   def main(args: Array[String]): scala.Unit = println(amount)
[warn] } source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-1,offset=12
[warn] object Test {
[warn]             ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:7: scala.AnyRef source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-7,offset=112
[warn] }
[warn]  ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:2: val five = 5 source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-2,offset=20
[warn]   val five = 5
[warn]       ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:2: 5 source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-2,offset=27
[warn]   val five = 5
[warn]              ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:3: val amount = five.$div(0) source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-3,offset=35
[warn]   val amount = five / 0
[warn]       ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:3: five.$div(0) source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-3,offset=49
[warn]   val amount = five / 0
[warn]                     ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:3: five source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-3,offset=44
[warn]   val amount = five / 0
[warn]                ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:3: 0 source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-3,offset=51
[warn]   val amount = five / 0
[warn]                       ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:4: def main(args: Array[String]): scala.Unit = println(amount) source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-4,offset=59
[warn]   def main(args: Array[String]) {
[warn]       ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:4: val args: Array[String] = _ source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-4,offset=64
[warn]   def main(args: Array[String]) {
[warn]            ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:4: Array[String] source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-4,offset=70
[warn]   def main(args: Array[String]) {
[warn]                  ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:4: String source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-4,offset=76
[warn]   def main(args: Array[String]) {
[warn]                        ^
[warn] <empty> NoPosition
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:5: println(amount) source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-5,offset=98
[warn]     println(amount)
[warn]            ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:5: println source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-5,offset=91
[warn]     println(amount)
[warn]     ^
[warn] /home/rainwarrior/minecraft/sc4/plugin-test/test.scala:5: amount source-/home/rainwarrior/minecraft/sc4/plugin-test/test.scala,line-5,offset=99
[warn]     println(amount)
[warn]             ^
[warn] 24 warnings found

plugin.scala

package testplugin

import scala.tools.nsc
import nsc.Global
import nsc.Phase
import nsc.plugins.Plugin
import nsc.plugins.PluginComponent

/**
* An example of a simple compiler plugin, which checks for obvious
* cases of division by zero where the denominator in the division
* expression is the constant zero:
*
* {{{
* val x = y / 0
* }}}
*
* For more information on how this plugin is implemented, see
* [[http://www.scala-lang.org/node/140 Writing Scala Compiler Plugins]]
* by Lex Spoon.
*/
class DivByZero(val global: Global) extends Plugin {
  val name = "divbyzero"
  val description = "checks for division by zero"
  val components = List[PluginComponent](new DivByZeroComponent(global))
}

class DivByZeroComponent(val global : Global) extends PluginComponent {
  import global._
  
  val runsAfter = List("parser")
  override val runsBefore = List("namer")

  val phaseName = "divbyzero"
  def newPhase(_prev: Phase) = new DivByZeroPhase(_prev)

  class DivByZeroPhase(prev: Phase) extends StdPhase(prev) {

    override def name = "divbyzero"
    def apply(unit: CompilationUnit) {
      for(tree <- unit.body) { unit.warning(tree.pos, s"$tree ${tree.pos}") }
      /*for ( tree @ Apply(Select(rcvr, nme.DIV), List(Literal(Constant(0)))) <- unit.body;
           if rcvr.tpe <:< definitions.IntClass.tpe)
        {
          unit.error(tree.pos, s"definitely division by zero ${tree.pos}")
        }*/
    }
  }
}

test.java

public class JavaTest
{
        public static void main(String[] args)
        {
                System.out.println(args.length);
        }
}

test.scala

object Test {
  val five = 5
  val amount = five / 0
  def main(args: Array[String]) {
    println(amount)
  }
}