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/*
* Copyright (C) 2012 Typesafe Inc. <http://www.typesafe.com>
*/
package scala.async
import org.junit.runner.RunWith
import org.junit.runners.JUnit4
import org.junit.Test
import AsyncId._
@RunWith(classOf[JUnit4])
class TreeInterrogation {
@Test
def `a minimal set of vals are lifted to vars`() {
val cm = reflect.runtime.currentMirror
val tb = mkToolbox("-cp target/scala-2.10/classes")
val tree = tb.parse(
"""| import _root_.scala.async.AsyncId._
| async {
| val x = await(1)
| val y = x * 2
| val z = await(x * 3)
| z
| }""".stripMargin)
val tree1 = tb.typeCheck(tree)
//println(cm.universe.show(tree1))
import tb.mirror.universe._
val functions = tree1.collect {
case f: Function => f
case t: Template => t
}
functions.size mustBe 1
val varDefs = tree1.collect {
case ValDef(mods, name, _, _) if mods.hasFlag(Flag.MUTABLE) => name
}
varDefs.map(_.decoded.trim).toSet mustBe (Set("state$async", "await$1", "await$2"))
}
}
object TreeInterrogation extends App {
def withDebug[T](t: => T) {
AsyncUtils.trace = true
AsyncUtils.verbose = true
try t
finally {
AsyncUtils.trace = false
AsyncUtils.verbose = false
}
}
withDebug {
val cm = reflect.runtime.currentMirror
val tb = mkToolbox("-cp target/scala-2.10/classes -Xprint:all")
val tree = tb.parse(
""" import _root_.scala.async.AsyncId._
| val state = 23
| val result: Any = "result"
| def resume(): Any = "resume"
| val res = async {
| val f1 = async { state + 2 }
| val x = await(f1)
| val y = await(async { result })
| val z = await(async { resume() })
| (x, y, z)
| }
| ()
| """.stripMargin)
println(tree)
val tree1 = tb.typeCheck(tree.duplicate)
println(cm.universe.show(tree1))
println(tb.eval(tree))
}
}
|
