Scala example source code file (StatisticsInfo.scala)

This example Scala source code file (StatisticsInfo.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

compiler, cumulative, global, list, nsc, phase, reflection, seq, statisticsinfo, utilities

The StatisticsInfo.scala Scala example source code

/* NSC -- new Scala compiler
 * Copyright 2005-2013 LAMP/EPFL
 * @author  Martin Odersky
 */

package scala.tools.nsc
package util

import scala.reflect.internal.util.Statistics

abstract class StatisticsInfo {

  val global: Global
  import global._
  import scala.reflect.internal.TreesStats.nodeByType

  val phasesShown = List("parser", "typer", "patmat", "erasure", "cleanup")

  val retainedCount  = Statistics.newCounter("#retained tree nodes")
  val retainedByType = Statistics.newByClass("#retained tree nodes by type")(Statistics.newCounter(""))

  def print(phase: Phase) = if (phasesShown contains phase.name) {
    inform("*** Cumulative statistics at phase " + phase)
    retainedCount.value = 0
    for (c <- retainedByType.keys)
      retainedByType(c).value = 0
    for (u <- currentRun.units; t <- u.body) {
      retainedCount.value += 1
      retainedByType(t.getClass).value += 1
    }

    val quants =
      if (phase.name == "parser") Seq(treeNodeCount, nodeByType, retainedCount, retainedByType)
      else Statistics.allQuantities

    for (q <- quants if q.showAt(phase.name)) inform(q.line)
  }
}