Scala example source code file (BCodeICodeCommon.scala)

This example Scala source code file (BCodeICodeCommon.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

bcodeicodecommon, compiler, g, global, literal, nsc, tree

The BCodeICodeCommon.scala Scala example source code

/* NSC -- new Scala compiler
 * Copyright 2005-2014 LAMP/EPFL
 * @author  Martin Odersky
 */

package scala.tools.nsc.backend.jvm

import scala.tools.nsc.Global
import PartialFunction._

/**
 * This trait contains code shared between GenBCode and GenICode that depends on types defined in
 * the compiler cake (Global).
 */
final class BCodeICodeCommon[G <: Global](val global: G) {
  import global._

  /** Some useful equality helpers. */
  def isNull(t: Tree) = cond(t) { case Literal(Constant(null)) => true }
  def isLiteral(t: Tree) = cond(t) { case Literal(_) => true }
  def isNonNullExpr(t: Tree) = isLiteral(t) || ((t.symbol ne null) && t.symbol.isModule)

  /** If l or r is constant null, returns the other ; otherwise null */
  def ifOneIsNull(l: Tree, r: Tree) = if (isNull(l)) r else if (isNull(r)) l else null
}