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package scala
package reflect.internal
package util
import scala.collection.mutable
trait TraceSymbolActivity {
val global: SymbolTable
import global._
private[this] var enabled = traceSymbolActivity
if (enabled && global.isCompilerUniverse)
scala.sys addShutdownHook showAllSymbols()
val allSymbols = mutable.Map[Int, Symbol]()
val allChildren = mutable.Map[Int, List[Int]]() withDefaultValue Nil
val prevOwners = mutable.Map[Int, List[(Int, Phase)]]() withDefaultValue Nil
val allTrees = mutable.Set[Tree]()
def recordSymbolsInTree(tree: Tree) {
if (enabled)
allTrees += tree
}
def recordNewSymbol(sym: Symbol) {
if (enabled && sym.id > 1) {
allSymbols(sym.id) = sym
allChildren(sym.owner.id) ::= sym.id
}
}
def recordNewSymbolOwner(sym: Symbol, newOwner: Symbol) {
if (enabled) {
val sid = sym.id
val oid = sym.owner.id
val nid = newOwner.id
prevOwners(sid) ::= (oid -> phase)
allChildren(oid) = allChildren(oid) filterNot (_ == sid)
allChildren(nid) ::= sid
}
}
private lazy val erasurePhase = findPhaseWithName("erasure")
private def signature(id: Int) = enteringPhase(erasurePhase)(allSymbols(id).defString)
private def dashes(s: Any): String = ("" + s) map (_ => '-')
private def show(s1: Any, ss: Any*) {
println("%-12s".format(s1) +: ss mkString " ")
}
private def showHeader(s1: Any, ss: Any*) {
show(s1, ss: _*)
show(dashes(s1), ss map dashes: _*)
}
private def showSym(sym: Symbol) {
def prefix = (" " * (sym.ownerChain.length - 1)) + sym.id
try println("%s#%s %s".format(prefix, sym.accurateKindString, sym.name.decode))
catch {
case x: Throwable => println(prefix + " failed: " + x)
}
allChildren(sym.id).sorted foreach showIdAndRemove
}
private def showIdAndRemove(id: Int) {
allSymbols remove id foreach showSym
}
private def symbolStr(id: Int): String = {
if (id == 1) "NoSymbol" else {
val sym = allSymbols(id)
sym.accurateKindString + " " + sym.name.decode
}
}
private def ownerStr(id: Int): String = {
val sym = allSymbols(id)
sym.name.decode + "#" + sym.id
}
private def freq[T, U](xs: scala.collection.Traversable[T])(fn: T => U): List[(U, Int)] = {
val ys = xs groupBy fn mapValues (_.size)
ys.toList sortBy (-_._2)
}
private def showMapFreq[T](xs: scala.collection.Map[T, Traversable[_]])(showFn: T => String) {
xs.mapValues(_.size).toList.sortBy(-_._2) take 100 foreach { case (k, size) =>
show(size, showFn(k))
}
println("\n")
}
private def showFreq[T, U](xs: Traversable[T])(groupFn: T => U, showFn: U => String) = {
showMapFreq(xs.toList groupBy groupFn)(showFn)
}
def showAllSymbols() {
if (!enabled) return
enabled = false
allSymbols(1) = NoSymbol
println("" + allSymbols.size + " symbols created.")
println("")
showHeader("descendants", "symbol")
showFreq(allSymbols.values flatMap (_.ownerChain drop 1))(_.id, symbolStr)
showHeader("children", "symbol")
showMapFreq(allChildren)(symbolStr)
if (prevOwners.nonEmpty) {
showHeader("prev owners", "symbol")
showMapFreq(prevOwners) { k =>
val owners = (((allSymbols(k).owner.id, NoPhase)) :: prevOwners(k)) map {
case (oid, NoPhase) => "-> owned by " + ownerStr(oid)
case (oid, ph) => "-> owned by %s (until %s)".format(ownerStr(oid), ph)
}
signature(k) :: owners mkString "\n "
}
}
val nameFreq = allSymbols.values.toList groupBy (_.name)
showHeader("frequency", "%-15s".format("name"), "owners")
showMapFreq(nameFreq) { name =>
"%-15s %s".format(name.decode, {
val owners = freq(nameFreq(name))(_.owner)
"%4s owners (%s)".format(
owners.size,
owners.take(3).map({ case (k, v) => v + "/" + k }).mkString(", ") + ", ..."
)
})
}
allSymbols.keys.toList.sorted foreach showIdAndRemove
}
}
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