266 lines
9.1 KiB
Java
266 lines
9.1 KiB
Java
/*
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* Copyright (c) 2017, 2022, Oracle and/or its affiliates. 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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package gc.TestJNIWeak;
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/* @test
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* @bug 8166188 8178813
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* @summary Test return of JNI weak global refs during concurrent
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* marking, verifying the use of the load barrier to keep the
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* referent alive.
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm/native
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* -Xbootclasspath/a:.
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* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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* -Xint
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* gc.TestJNIWeak.TestJNIWeak
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* @run main/othervm/native
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* -Xbootclasspath/a:.
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* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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* -Xcomp
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* gc.TestJNIWeak.TestJNIWeak
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*/
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import jdk.test.whitebox.gc.GC;
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import jdk.test.whitebox.WhiteBox;
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import jtreg.SkippedException;
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import java.lang.ref.Reference;
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public final class TestJNIWeak {
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static {
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System.loadLibrary("TestJNIWeak");
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}
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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private static final class TestObject {
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public final int value;
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public TestObject(int value) {
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this.value = value;
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}
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}
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private volatile TestObject testObject = null;
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private static native void registerObject(Object o);
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private static native void unregisterObject();
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private static native Object getReturnedWeak();
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private static native Object getResolvedWeak();
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// resolve controls whether getObject returns an explicitly
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// resolved jweak value (when resolve is true), or returns the
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// jweak directly and invokes the implicit resolution in the
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// native call return value handling path (when resolve is false).
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private boolean resolve = true;
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TestJNIWeak(boolean resolve) {
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this.resolve = resolve;
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}
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private Object getObject() {
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if (resolve) {
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return getResolvedWeak();
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} else {
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return getReturnedWeak();
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}
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}
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// Create the test object and record it both strongly and weakly.
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private void remember(int value) {
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TestObject o = new TestObject(value);
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registerObject(o);
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testObject = o;
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}
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// Remove both strong and weak references to the current test object.
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private void forget() {
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unregisterObject();
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testObject = null;
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}
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// Repeatedly perform full GC until o is in the old generation.
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private void gcUntilOld(Object o) {
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while (!WB.isObjectInOldGen(o)) {
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WB.fullGC();
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}
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}
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// Verify the weakly recorded object
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private void checkValue(int value) throws Exception {
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Object o = getObject();
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if (o == null) {
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throw new RuntimeException("Weak reference unexpectedly null");
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}
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TestObject t = (TestObject)o;
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if (t.value != value) {
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throw new RuntimeException("Incorrect value");
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}
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}
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// Verify we can create a weak reference and get it back.
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private void checkSanity() throws Exception {
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System.out.println("running checkSanity");
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try {
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// Inhibit concurrent GC during this check.
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WB.concurrentGCAcquireControl();
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int value = 5;
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try {
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remember(value);
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checkValue(value);
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} finally {
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forget();
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}
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} finally {
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WB.concurrentGCReleaseControl();
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}
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}
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// Verify weak ref value survives across collection if strong ref exists.
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private void checkSurvival() throws Exception {
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System.out.println("running checkSurvival");
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try {
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int value = 10;
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try {
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remember(value);
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checkValue(value);
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gcUntilOld(testObject);
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// Run a concurrent collection after object is old.
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WB.concurrentGCAcquireControl();
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WB.concurrentGCRunTo(WB.AFTER_MARKING_STARTED);
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WB.concurrentGCRunToIdle();
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// Verify weak ref still has expected value.
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checkValue(value);
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} finally {
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forget();
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}
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} finally {
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WB.concurrentGCReleaseControl();
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}
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}
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// Verify weak ref cleared if no strong ref exists.
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private void checkClear() throws Exception {
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System.out.println("running checkClear");
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try {
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int value = 15;
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try {
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remember(value);
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checkValue(value);
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gcUntilOld(testObject);
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// Run a concurrent collection after object is old.
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WB.concurrentGCAcquireControl();
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WB.concurrentGCRunTo(WB.AFTER_MARKING_STARTED);
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WB.concurrentGCRunToIdle();
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checkValue(value);
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testObject = null;
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// Run a concurrent collection after strong ref removed.
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WB.concurrentGCRunTo(WB.AFTER_MARKING_STARTED);
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WB.concurrentGCRunToIdle();
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// Verify weak ref cleared as expected.
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Object recorded = getObject();
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if (recorded != null) {
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throw new RuntimeException("expected clear");
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}
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} finally {
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forget();
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}
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} finally {
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WB.concurrentGCReleaseControl();
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}
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}
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// Verify weak ref not cleared if no strong ref at start of
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// collection but weak ref read during marking.
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private void checkShouldNotClear() throws Exception {
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System.out.println("running checkShouldNotClear");
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try {
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int value = 20;
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try {
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remember(value);
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checkValue(value);
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gcUntilOld(testObject);
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// Block concurrent cycle until we're ready.
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WB.concurrentGCAcquireControl();
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checkValue(value);
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testObject = null; // Discard strong ref
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// Run through most of marking
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WB.concurrentGCRunTo(WB.BEFORE_MARKING_COMPLETED);
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// Fetch weak ref'ed object. Should be kept alive now.
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Object recovered = getObject();
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if (recovered == null) {
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throw new RuntimeException("unexpected clear during mark");
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}
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// Finish collection, including reference processing.
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// Block any further cycles while we finish check.
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WB.concurrentGCRunToIdle();
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// Fetch weak ref'ed object. Referent is manifestly
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// live in recovered; the earlier fetch should have
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// kept it alive through collection, so weak ref
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// should not have been cleared.
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if (getObject() == null) {
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// 8166188 problem results in not doing the
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// keep-alive of earlier getObject result, so
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// recovered is now reachable but not marked.
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// We may eventually crash.
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throw new RuntimeException("cleared jweak for live object");
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}
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Reference.reachabilityFence(recovered);
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} finally {
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forget();
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}
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} finally {
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WB.concurrentGCReleaseControl();
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}
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}
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private void check() throws Exception {
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checkSanity();
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checkSurvival();
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checkClear();
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checkShouldNotClear();
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System.out.println("Check passed");
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}
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public static void main(String[] args) throws Exception {
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if (!WB.supportsConcurrentGCBreakpoints()) {
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throw new SkippedException(
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GC.selected().name() + " doesn't support concurrent GC breakpoints");
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}
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// Perform check with direct jweak resolution.
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System.out.println("Check with jweak resolved");
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new TestJNIWeak(true).check();
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// Perform check with implicit jweak resolution by native
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// call's return value handling.
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System.out.println("Check with jweak returned");
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new TestJNIWeak(false).check();
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}
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}
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