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List: openjdk-hotspot-dev
Subject: Re.: CHA ignores default methods during analysis leading to incorrect code generation
From: Yann Le Tallec <ylt () letallec ! org>
Date: 2014-02-28 20:27:40
Message-ID: CAOPu7EiB0FwnjO+PfebpAjtvGap-frWpYqB-9WRodbegziGCgw () mail ! gmail ! com
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Original message:
http://mail.openjdk.java.net/pipermail/hotspot-dev/2014-January/012252.html
The test (DefaultAndConcreteMethodsCHA.java) passes as expected on b129.
However a post on Stackoverflow reports a very similar bug that can still
be reproduced on b129: http://stackoverflow.com/q/22096052/829571
Code copied below for reference - I get the erroneous output for i ~ 260,
i.e. after approximately 25 seconds.
Yann
public class IsolatedBug {
static int i = 0;
private final Box box;
private final List<Drawable> drawables;
public IsolatedBug() {
this.box = new Box();
this.drawables = new ArrayList<>();
drawables.add(box);
drawables.forEach(drawable -> System.out.println(++i + " " +
drawable + " C=" + drawable.isShadowCaster() + "/R=" +
drawable.isShadowReceiver()));
}
private void init() throws InterruptedException {
while (true) {
drawables.forEach(drawable -> System.out.println(++i + " " +
drawable + " C=" + drawable.isShadowCaster() + "/R=" +
drawable.isShadowReceiver()));
Thread.sleep(100);
}
}
public static void main(String[] args) throws InterruptedException {
new IsolatedBug().init();
}
}
abstract class Drawable implements DrawableInterface {}
interface DrawableInterface {
default public boolean isShadowReceiver() { return false; }
default public boolean isShadowCaster() { return false; }
}
interface ShadowDrawable extends DrawableInterface {
@Override default public boolean isShadowReceiver() { return true; }
@Override default public boolean isShadowCaster() { return true; }
}
class Box extends Drawable implements ShadowDrawable {}
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