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/*
* Copyright (c) 2018, Red Hat, Inc. All rights reserved.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
/*
* @test TestRefprocSanity
* @summary Test that null references/referents work fine
* @key gc
* @requires vm.gc.Shenandoah & !vm.graal.enabled
*
* @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
* -XX:+UseShenandoahGC
* -XX:+ShenandoahVerify
* TestRefprocSanity
*
* @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
* -XX:+UseShenandoahGC
* TestRefprocSanity
*
* @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
* -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
* TestRefprocSanity
*/
/*
* @test TestRefprocSanity
* @summary Test that null references/referents work fine
* @key gc
* @requires vm.gc.Shenandoah & !vm.graal.enabled
*
* @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
* -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
* -XX:+ShenandoahVerify
* TestRefprocSanity
*
* @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
* -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
* TestRefprocSanity
*
* @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
* -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
* TestRefprocSanity
*/
import java.lang.ref.*;
public class TestRefprocSanity {
static final long TARGET_MB = Long.getLong("target", 1_000); // 1 Gb allocation
static final int WINDOW = 1_000;
static final Reference<MyObject>[] refs = new Reference[WINDOW];
static Object sink;
public static void main(String[] args) throws Exception {
long count = TARGET_MB * 1024 * 1024 / 128;
int rIdx = 0;
ReferenceQueue rq = new ReferenceQueue();
for (int c = 0; c < WINDOW; c++) {
refs[c] = select(c, new MyObject(c), rq);
}
for (int c = 0; c < count; c++) {
verifyRefAt(rIdx);
refs[rIdx] = select(c, new MyObject(rIdx), rq);
rIdx++;
if (rIdx >= WINDOW) {
rIdx = 0;
}
// Do allocations to force GCs
sink = new byte[100];
// Drain the refqueue
while (rq.poll() != null);
}
}
static Reference<MyObject> select(int v, MyObject ext, ReferenceQueue rq) {
switch (v % 10) {
case 0: return new SoftReference<MyObject>(null);
case 1: return new SoftReference<MyObject>(null, rq);
case 2: return new SoftReference<MyObject>(ext);
case 3: return new SoftReference<MyObject>(ext, rq);
case 4: return new WeakReference<MyObject>(null);
case 5: return new WeakReference<MyObject>(null, rq);
case 6: return new WeakReference<MyObject>(ext);
case 7: return new WeakReference<MyObject>(ext, rq);
case 8: return new PhantomReference<MyObject>(null, rq);
case 9: return new PhantomReference<MyObject>(ext, rq);
default: throw new IllegalStateException();
}
}
static void verifyRefAt(int idx) {
Reference<MyObject> ref = refs[idx];
MyObject mo = ref.get();
if (mo != null && mo.x != idx) {
throw new IllegalStateException("Referent tag is incorrect: " + mo.x + ", should be " + idx);
}
}
static class MyObject {
final int x;
public MyObject(int x) {
this.x = x;
}
}
}
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