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import scala.tools.partest.IcodeTest
object Test extends IcodeTest {
override def printIcodeAfterPhase = "dce"
override def extraSettings: String = super.extraSettings + " -optimize"
override def code =
"""class Foo {
def randomBoolean = util.Random.nextInt % 2 == 0
def bar = {
var kept1 = new Object
val result = new java.lang.ref.WeakReference(kept1)
kept1 = null // we can't eliminate this assigment because result can observe
// when the object has no more references. See SI-5313
kept1 = new Object // but we can eliminate this one because kept1 has already been clobbered
var erased2 = null // we can eliminate this store because it's never used
val erased3 = erased2 // and this
var erased4 = erased2 // and this
val erased5 = erased4 // and this
var kept2: Object = new Object // ultimately can't be eliminated
while(randomBoolean) {
val kept3 = kept2
kept2 = null // this can't, because it clobbers kept2, which is used
erased4 = null // safe to eliminate
println(kept3)
}
var kept4 = new Object // have to keep, it's used
try
println(kept4)
catch {
case _ : Throwable => kept4 = null // have to keep, it clobbers kept4 which is used
}
var kept5 = new Object
print(kept5)
kept5 = null // can't eliminate it's a clobber and it's used
print(kept5)
kept5 = null // can eliminate because we don't care about clobbers of nulls
while(randomBoolean) {
var kept6: AnyRef = null // not used, but have to keep because it clobbers the next used store
// on the back edge of the loop
kept6 = new Object // used
println(kept6)
}
result
}
}""".stripMargin
override def show() {
val storeLocal = "STORE_LOCAL"
val lines1 = collectIcode("") filter (_ contains storeLocal) map (x => x.drop(x.indexOf(storeLocal)))
println(lines1 mkString "\n")
}
}
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