148 lines
5.2 KiB
Java
148 lines
5.2 KiB
Java
/*
|
|
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* 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
|
|
* @bug 8133348
|
|
* @summary Tests if reachabilityFence is working
|
|
*
|
|
* @requires vm.opt.DeoptimizeALot != true
|
|
*
|
|
* @run main/othervm -Xint -Dpremature=false ReachabilityFenceTest
|
|
* @run main/othervm -Xbatch -XX:TieredStopAtLevel=1 -Dpremature=true ReachabilityFenceTest
|
|
* @run main/othervm -Xbatch -XX:TieredStopAtLevel=2 -Dpremature=true ReachabilityFenceTest
|
|
* @run main/othervm -Xbatch -XX:TieredStopAtLevel=3 -Dpremature=true ReachabilityFenceTest
|
|
* @run main/othervm -Xbatch -XX:TieredStopAtLevel=4 -Dpremature=true ReachabilityFenceTest
|
|
*/
|
|
|
|
import java.lang.ref.Reference;
|
|
import java.util.concurrent.atomic.AtomicBoolean;
|
|
|
|
public class ReachabilityFenceTest {
|
|
|
|
/*
|
|
* Implementation notes:
|
|
*
|
|
* This test has positive and negative parts.
|
|
*
|
|
* Negative test is "nonFenced", and it tests that absent of reachabilityFence, the object can
|
|
* be prematurely finalized -- this validates the test itself. Not every VM mode is expected to
|
|
* prematurely finalize the objects, and -Dpremature option communicates that to test. If a VM mode
|
|
* passes the negative test, then our understanding of what could happen is correct, and we can
|
|
* go forward.
|
|
*
|
|
* Positive test is "fenced", and it checks that given the reachabilityFence at the end of the block,
|
|
* the object cannot be finalized. There is no sense running a positive test when premature finalization
|
|
* is not expected. It is a job for negative test to verify that invariant.
|
|
*
|
|
* The test methods should be appropriately compiled, therefore we do several iterations and run with -Xbatch.
|
|
*/
|
|
|
|
// Enough to OSR and compile
|
|
static final int LOOP_ITERS = Integer.getInteger("LOOP_ITERS", 50000);
|
|
|
|
// Enough after which to start triggering GC and finalization
|
|
static final int WARMUP_LOOP_ITERS = LOOP_ITERS - Integer.getInteger("GC_ITERS", 100);
|
|
|
|
// Enough to switch from an OSR'ed method to compiled method
|
|
static final int MAIN_ITERS = 3;
|
|
|
|
static final boolean PREMATURE_FINALIZATION = Boolean.getBoolean("premature");
|
|
|
|
public static void main(String... args) {
|
|
// Negative test
|
|
boolean finalized = false;
|
|
for (int c = 0; !finalized && c < MAIN_ITERS; c++) {
|
|
finalized |= nonFenced();
|
|
}
|
|
|
|
if (PREMATURE_FINALIZATION && !finalized) {
|
|
throw new IllegalStateException("The object had never been finalized before timeout reached.");
|
|
}
|
|
|
|
if (!PREMATURE_FINALIZATION && finalized) {
|
|
throw new IllegalStateException("The object had been finalized without a fence, even though we don't expect it.");
|
|
}
|
|
|
|
if (!PREMATURE_FINALIZATION)
|
|
return;
|
|
|
|
// Positive test
|
|
finalized = false;
|
|
for (int c = 0; !finalized && c < MAIN_ITERS; c++) {
|
|
finalized |= fenced();
|
|
}
|
|
|
|
if (finalized) {
|
|
throw new IllegalStateException("The object had been prematurely finalized.");
|
|
}
|
|
}
|
|
|
|
public static boolean nonFenced() {
|
|
AtomicBoolean finalized = new AtomicBoolean();
|
|
MyFinalizeable o = new MyFinalizeable(finalized);
|
|
|
|
for (int i = 0; i < LOOP_ITERS; i++) {
|
|
if (finalized.get()) break;
|
|
if (i > WARMUP_LOOP_ITERS) {
|
|
System.gc();
|
|
System.runFinalization();
|
|
}
|
|
}
|
|
|
|
return finalized.get();
|
|
}
|
|
|
|
public static boolean fenced() {
|
|
AtomicBoolean finalized = new AtomicBoolean();
|
|
MyFinalizeable o = new MyFinalizeable(finalized);
|
|
|
|
for (int i = 0; i < LOOP_ITERS; i++) {
|
|
if (finalized.get()) break;
|
|
if (i > WARMUP_LOOP_ITERS) {
|
|
System.gc();
|
|
System.runFinalization();
|
|
}
|
|
}
|
|
|
|
try {
|
|
return finalized.get();
|
|
} finally {
|
|
Reference.reachabilityFence(o);
|
|
}
|
|
}
|
|
|
|
private static class MyFinalizeable {
|
|
private final AtomicBoolean finalized;
|
|
|
|
public MyFinalizeable(AtomicBoolean b) {
|
|
this.finalized = b;
|
|
}
|
|
|
|
@Override
|
|
protected void finalize() throws Throwable {
|
|
super.finalize();
|
|
finalized.set(true);
|
|
}
|
|
}
|
|
}
|