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/* 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
}
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