Attempt #3 to optimize findMember

Fixed fingerPrinting scheme to work with rehashes, also added finger prints to typedIdent searches.

Author: odersky

src/compiler/scala/tools/nsc/typechecker/Typers.scala

@@ -4510,6 +4510,8 @@ trait Typers extends Modes with Adaptations with Tags {
           assert(errorContainer == null, "Cannot set ambiguous error twice for identifier")
           errorContainer = tree
         }
+        
+        val fingerPrint: Long = name.fingerPrint
 
         var defSym: Symbol = tree.symbol  // the directly found symbol
         var pre: Type = NoPrefix          // the prefix type of defSym, if a class member
@@ -4548,7 +4550,10 @@ trait Typers extends Modes with Adaptations with Tags {
           var cx = startingIdentContext
           while (defSym == NoSymbol && cx != NoContext && (cx.scope ne null)) { // cx.scope eq null arises during FixInvalidSyms in Duplicators
             pre = cx.enclClass.prefix
-            defEntry = cx.scope.lookupEntry(name)
+            defEntry = {
+                val scope = cx.scope
+                if ((fingerPrint & scope.fingerPrints) != 0) scope.lookupEntry(name) else null
+              }
             if ((defEntry ne null) && qualifies(defEntry.sym)) {
               // Right here is where SI-1987, overloading in package objects, can be
               // seen to go wrong. There is an overloaded symbol, but when referring

src/reflect/scala/reflect/internal/Names.scala

@@ -414,6 +414,9 @@ trait Names extends api.Names {
       }
       else toString
     }
+    
+    @inline
+    final def fingerPrint: Long = (1L << start)
 
     /** TODO - find some efficiency. */
     def append(ch: Char)        = newName("" + this + ch)

src/reflect/scala/reflect/internal/Scopes.scala

@@ -41,15 +41,15 @@ trait Scopes extends api.Scopes { self: SymbolTable =>
    *  This is necessary because when run from reflection every scope needs to have a
    *  SynchronizedScope as mixin.
    */
-  class Scope protected[Scopes] (initElems: ScopeEntry = null) extends Iterable[Symbol] {
+  class Scope protected[Scopes] (initElems: ScopeEntry = null, initFingerPrints: Long = 0L) extends Iterable[Symbol] {
 
     /** A bitset containing the last 6 bits of the start value of every name 
      *  stored in this scope.
      */
-    var fingerPrints: Long = 0L
+    var fingerPrints: Long = initFingerPrints
 
     protected[Scopes] def this(base: Scope) = {
-      this(base.elems)
+      this(base.elems, base.fingerPrints)
       nestinglevel = base.nestinglevel + 1
     }
 
@@ -119,7 +119,7 @@ trait Scopes extends api.Scopes { self: SymbolTable =>
      *  @param sym ...
      */
     def enter[T <: Symbol](sym: T): T = { 
-      fingerPrints |= (1L << sym.name.start)
+      fingerPrints |= sym.name.fingerPrint
       enterEntry(newScopeEntry(sym, this)) 
       sym 
     }
@@ -156,6 +156,7 @@ trait Scopes extends api.Scopes { self: SymbolTable =>
     }
 
     def rehash(sym: Symbol, newname: Name) {
+      fingerPrints |= newname.fingerPrint
       if (hashtable ne null) {
         val index = sym.name.start & HASHMASK
         var e1 = hashtable(index)

src/reflect/scala/reflect/internal/Types.scala

@@ -1045,7 +1045,7 @@ trait Types extends api.Types { self: SymbolTable =>
       var continue = true
       var self: Type = null
       var membertpe: Type = null
-      val fingerPrint: Long = (1L << name.start)
+      val fingerPrint: Long = name.fingerPrint
       while (continue) {
         continue = false
         val bcs0 = baseClasses
@@ -1612,8 +1612,13 @@ trait Types extends api.Types { self: SymbolTable =>
     if (period != currentPeriod) {
       tpe.baseClassesPeriod = currentPeriod
       if (!isValidForBaseClasses(period)) {
-        tpe.baseClassesCache = null
-        tpe.baseClassesCache = tpe.memo(computeBaseClasses)(tpe.typeSymbol :: _.baseClasses.tail)
+        val start = Statistics.pushTimer(typeOpsStack, baseClassesNanos)
+        try {
+          tpe.baseClassesCache = null
+          tpe.baseClassesCache = tpe.memo(computeBaseClasses)(tpe.typeSymbol :: _.baseClasses.tail)
+        } finally {
+          Statistics.popTimer(typeOpsStack, start)
+        }
       }
     }
     if (tpe.baseClassesCache eq null)
@@ -6909,6 +6914,7 @@ object TypesStats {
   val findMemberNanos     = Statistics.newStackableTimer("time spent in findmember", typerNanos)
   val asSeenFromNanos     = Statistics.newStackableTimer("time spent in asSeenFrom", typerNanos)
   val baseTypeSeqNanos    = Statistics.newStackableTimer("time spent in baseTypeSeq", typerNanos)
+  val baseClassesNanos    = Statistics.newStackableTimer("time spent in baseClasses", typerNanos)
   val compoundBaseTypeSeqCount = Statistics.newSubCounter("  of which for compound types", baseTypeSeqCount)
   val typerefBaseTypeSeqCount = Statistics.newSubCounter("  of which for typerefs", baseTypeSeqCount)
   val singletonBaseTypeSeqCount = Statistics.newSubCounter("  of which for singletons", baseTypeSeqCount)