Closed
Description
object Test {
def main(args: Array[String]): Unit = {
test()
}
def test() {
new Stream().withFilter.next.next.next.next.next.next.next.next
}
class Stream() {
println("new Stream()")
val data = Array.ofDim[Byte](64 * 1024 * 1024)
lazy val next = new Stream
@inline
final def withFilter = new StreamWithFilter(this)
}
final class StreamWithFilter(var s: Stream) {
lazy val filtered = { val result = s.next; s = null; result}
def next: Stream = filtered.next
}
}% qscalac sandbox/test.scala && echo ':javap -c Test$#test' | qscala && qscala -nc Test
Welcome to Scala version 2.12.0-20150204-161502-f894c55ef3 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_25).
Type in expressions to have them evaluated.
Type :help for more information.
scala> :javap -c Test$#test
public void test();
Code:
0: new #22 // class Test$Stream
3: dup
4: invokespecial #23 // Method Test$Stream."<init>":()V
7: invokevirtual #27 // Method Test$Stream.withFilter:()LTest$StreamWithFilter;
10: invokevirtual #33 // Method Test$StreamWithFilter.next:()LTest$Stream;
13: invokevirtual #34 // Method Test$Stream.next:()LTest$Stream;
16: invokevirtual #34 // Method Test$Stream.next:()LTest$Stream;
19: invokevirtual #34 // Method Test$Stream.next:()LTest$Stream;
22: invokevirtual #34 // Method Test$Stream.next:()LTest$Stream;
25: invokevirtual #34 // Method Test$Stream.next:()LTest$Stream;
28: invokevirtual #34 // Method Test$Stream.next:()LTest$Stream;
31: invokevirtual #34 // Method Test$Stream.next:()LTest$Stream;
34: pop
35: return
}
scala> :quit
new Stream()
new Stream()
new Stream()
new Stream()
new Stream()
new Stream()
new Stream()
new Stream()
new Stream()
new Stream()
% qscalac -optimize -Yinline-warnings -Xfatal-warnings sandbox/test.scala && echo ':javap -c Test$#test' | qscala && qscala -nc Test
Welcome to Scala version 2.12.0-20150204-161502-f894c55ef3 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_25).
Type in expressions to have them evaluated.
Type :help for more information.
scala> :javap -c Test$#test
public void test();
Code:
0: new #22 // class Test$Stream
3: dup
4: invokespecial #23 // Method Test$Stream."<init>":()V
7: astore_1
8: new #25 // class Test$StreamWithFilter
11: dup
12: aload_1
13: invokespecial #28 // Method Test$StreamWithFilter."<init>":(LTest$Stream;)V
16: invokevirtual #32 // Method Test$StreamWithFilter.filtered:()LTest$Stream;
19: invokevirtual #35 // Method Test$Stream.next:()LTest$Stream;
22: invokevirtual #35 // Method Test$Stream.next:()LTest$Stream;
25: invokevirtual #35 // Method Test$Stream.next:()LTest$Stream;
28: invokevirtual #35 // Method Test$Stream.next:()LTest$Stream;
31: invokevirtual #35 // Method Test$Stream.next:()LTest$Stream;
34: invokevirtual #35 // Method Test$Stream.next:()LTest$Stream;
37: invokevirtual #35 // Method Test$Stream.next:()LTest$Stream;
40: invokevirtual #35 // Method Test$Stream.next:()LTest$Stream;
43: pop
44: return
}
scala> :quit
new Stream()
new Stream()
new Stream()
java.lang.OutOfMemoryError: Java heap space
at scala.reflect.ManifestFactory$$anon$6.newArray(Manifest.scala:93)
at scala.reflect.ManifestFactory$$anon$6.newArray(Manifest.scala:91)