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/*
* Copyright (C) 2012-2014 Typesafe Inc. <http://www.typesafe.com>
*/
package scala.async
import org.junit.Test
import scala.async.internal.AsyncId
import AsyncId._
import tools.reflect.ToolBox
class TreeInterrogation {
@Test
def `a minimal set of vals are lifted to vars`() {
val cm = reflect.runtime.currentMirror
val tb = mkToolbox(s"-cp ${toolboxClasspath}")
val tree = tb.parse(
"""| import _root_.scala.async.internal.AsyncId._
| async {
| val x = await(1)
| val y = x * 2
| def foo(a: Int) = { def nested = 0; a } // don't lift `nested`.
| val z = await(x * 3)
| foo(z)
| z
| }""".stripMargin)
val tree1 = tb.typeCheck(tree)
//println(cm.universe.show(tree1))
import tb.u._
val functions = tree1.collect {
case f: Function => f
case t: Template => t
}
functions.size mustBe 1
val varDefs = tree1.collect {
case vd @ ValDef(mods, name, _, _) if mods.hasFlag(Flag.MUTABLE) && vd.symbol.owner.isClass => name
}
varDefs.map(_.decoded.trim).toSet.toList.sorted mustStartWith (List("await$macro$", "await$macro$", "state"))
val defDefs = tree1.collect {
case t: Template =>
val stats: List[Tree] = t.body
stats.collect {
case dd : DefDef
if !dd.symbol.isImplementationArtifact
&& !dd.symbol.asTerm.isAccessor && !dd.symbol.asTerm.isSetter => dd.name
}
}.flatten
defDefs.map(_.decoded.trim).toList mustStartWith (List("foo$macro$", "<init>", "apply", "apply"))
}
}
object TreeInterrogation extends App {
def withDebug[T](t: => T): T = {
def set(level: String, value: Boolean) = System.setProperty(s"scala.async.$level", value.toString)
val levels = Seq("trace", "debug")
def setAll(value: Boolean) = levels.foreach(set(_, value))
setAll(value = true)
try t finally setAll(value = false)
}
withDebug {
val cm = reflect.runtime.currentMirror
val tb = mkToolbox(s"-cp ${toolboxClasspath} -Xprint:typer -uniqid")
import scala.async.internal.AsyncId._
val tree = tb.parse(
"""
| import scala.async.internal.AsyncId._
| async {
| var b = true
| while(await(b)) {
| b = false
| }
| await(b)
| }
|
| """.stripMargin)
println(tree)
val tree1 = tb.typeCheck(tree.duplicate)
println(cm.universe.show(tree1))
println(tb.eval(tree))
}
}
|
