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/*
* Copyright (c) 2016, 2018, 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 8165246 8010319
* @summary Test has_previous_versions flag and processing during class unloading.
* @requires vm.opt.final.ClassUnloading
* @library /test/lib
* @modules java.base/jdk.internal.misc
* @modules java.compiler
* java.instrument
* jdk.jartool/sun.tools.jar
* @run main RedefineClassHelper
* @run main/othervm RedefinePreviousVersions test
*/
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
// package access top-level classes to avoid problem with RedefineClassHelper
// and nested types.
class RedefinePreviousVersions_B { }
class RedefinePreviousVersions_Running {
public static volatile boolean stop = false;
public static volatile boolean running = false;
static void localSleep() {
try {
Thread.sleep(10); // sleep for 10 ms
} catch(InterruptedException ie) {
}
}
public static void infinite() {
running = true;
while (!stop) { localSleep(); }
}
}
public class RedefinePreviousVersions {
public static String newB =
"class RedefinePreviousVersions_B {" +
"}";
public static String newRunning =
"class RedefinePreviousVersions_Running {" +
" public static volatile boolean stop = true;" +
" public static volatile boolean running = true;" +
" static void localSleep() { }" +
" public static void infinite() { }" +
"}";
public static void main(String[] args) throws Exception {
if (args.length > 0) {
// java -javaagent:redefineagent.jar -Xlog:stuff RedefinePreviousVersions
ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( "-javaagent:redefineagent.jar",
"-Xlog:redefine+class+iklass+add=trace,redefine+class+iklass+purge=trace",
"RedefinePreviousVersions");
new OutputAnalyzer(pb.start())
.shouldContain("Class unloading: has_previous_versions = false")
.shouldContain("Class unloading: has_previous_versions = true")
.shouldHaveExitValue(0);
return;
}
// Redefine a class and create some garbage
// Since there are no methods running, the previous version is never added to the
// previous_version_list and the flag _has_previous_versions should stay false
RedefineClassHelper.redefineClass(RedefinePreviousVersions_B.class, newB);
for (int i = 0; i < 10 ; i++) {
String s = new String("some garbage");
System.gc();
}
// Start a class that has a method running
new Thread() {
public void run() {
RedefinePreviousVersions_Running.infinite();
}
}.start();
while (!RedefinePreviousVersions_Running.running) {
Thread.sleep(10); // sleep for 10 ms
}
// Since a method of newRunning is running, this class should be added to the previous_version_list
// of Running, and _has_previous_versions should return true at class unloading.
RedefineClassHelper.redefineClass(RedefinePreviousVersions_Running.class, newRunning);
for (int i = 0; i < 10 ; i++) {
String s = new String("some garbage");
System.gc();
}
// purge should clean everything up, except Xcomp it might not.
RedefinePreviousVersions_Running.stop = true;
for (int i = 0; i < 10 ; i++) {
String s = new String("some garbage");
System.gc();
}
}
}
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