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