Get rid of superIds

Author: odersky

compiler/src/dotty/tools/dotc/core/Contexts.scala

@@ -597,26 +597,6 @@ object Contexts {
 
     def nextId = { _nextId += 1; _nextId }
 
-    /** A map from a superclass id to the typeref of the class that has it */
-    private[core] var classOfId = new Array[ClassSymbol](Config.InitialSuperIdsSize)
-
-    /** A map from a the typeref of a class to its superclass id */
-    private[core] val superIdOfClass = new mutable.AnyRefMap[ClassSymbol, Int]
-
-    /** The last allocated superclass id */
-    private[core] var lastSuperId = -1
-
-    /** Allocate and return next free superclass id */
-    private[core] def nextSuperId: Int = {
-      lastSuperId += 1
-      if (lastSuperId >= classOfId.length) {
-        val tmp = new Array[ClassSymbol](classOfId.length * 2)
-        classOfId.copyToArray(tmp)
-        classOfId = tmp
-      }
-      lastSuperId
-    }
-
     // Types state
     /** A table for hash consing unique types */
     private[core] val uniques = new util.HashSet[Type](Config.initialUniquesCapacity) {
@@ -682,9 +662,6 @@ object Contexts {
 
     def reset() = {
       for ((_, set) <- uniqueSets) set.clear()
-      for (i <- 0 until classOfId.length) classOfId(i) = null
-      superIdOfClass.clear()
-      lastSuperId = -1
     }
 
     // Test that access is single threaded

compiler/src/dotty/tools/dotc/core/Symbols.scala

@@ -562,27 +562,6 @@ object Symbols {
     final def classDenot(implicit ctx: Context): ClassDenotation =
       denot.asInstanceOf[ClassDenotation]
 
-    private var superIdHint: Int = -1
-
-    override def superId(implicit ctx: Context): Int = {
-      val hint = superIdHint
-      if (hint >= 0 && hint <= ctx.lastSuperId && (ctx.classOfId(hint) eq this))
-        hint
-      else {
-        val id = ctx.superIdOfClass get this match {
-          case Some(id) =>
-            id
-          case None =>
-            val id = ctx.nextSuperId
-            ctx.superIdOfClass(this) = id
-            ctx.classOfId(id) = this
-            id
-        }
-        superIdHint = id
-        id
-      }
-    }
-
     override protected def prefixString = "ClassSymbol"
   }