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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Martin Odersky
*/
package scala
package reflect
package internal
abstract class Phase(val prev: Phase) {
if ((prev ne null) && (prev ne NoPhase))
prev.nx = this
type Id = Int
val id: Id = if (prev eq null) 0 else prev.id + 1
/** New flags visible after this phase has completed */
def nextFlags: Long = 0l
/** New flags visible once this phase has started */
def newFlags: Long = 0l
val fmask = (
if (prev eq null) Flags.InitialFlags
else prev.flagMask | prev.nextFlags | newFlags
)
def flagMask: Long = fmask
private var nx: Phase = NoPhase
// does anyone rely on next == this for terminus?
def next: Phase = if (nx eq NoPhase) this else nx
def hasNext = next != this
// this definition excludes the terminal phase
//def iterator = Iterator.iterate(this)(_.nx) takeWhile (p => p.next != p)
def iterator = Iterator.iterate(this)(_.nx) takeWhile (_ ne NoPhase)
def name: String
def description: String = name
// Will running with -Ycheck:name work?
def checkable: Boolean = true
// NOTE: sbt injects its own phases which extend this class, and not GlobalPhase, so we must implement this logic here
private val _erasedTypes = ((prev ne null) && (prev ne NoPhase)) && (prev.name == "erasure" || prev.erasedTypes)
def erasedTypes: Boolean = _erasedTypes // overridden in back-end
final val flatClasses: Boolean = ((prev ne null) && (prev ne NoPhase)) && (prev.name == "flatten" || prev.flatClasses)
final val specialized: Boolean = ((prev ne null) && (prev ne NoPhase)) && (prev.name == "specialize" || prev.specialized)
final val refChecked: Boolean = ((prev ne null) && (prev ne NoPhase)) && (prev.name == "refchecks" || prev.refChecked)
/** This is used only in unsafeTypeParams, and at this writing is
* overridden to false in parser, namer, typer, and erasure. (And NoPhase.)
*/
def keepsTypeParams = true
def run(): Unit
override def toString() = name
override def hashCode = id.## + name.##
override def equals(other: Any) = other match {
case x: Phase => id == x.id && name == x.name
case _ => false
}
}
object NoPhase extends Phase(null) {
def name = "<no phase>"
override def keepsTypeParams = false
def run() { throw new Error("NoPhase.run") }
}
object SomePhase extends Phase(NoPhase) {
def name = "<some phase>"
def run() { throw new Error("SomePhase.run") }
}
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