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| 1 | +/* |
| 2 | + * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved. |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | + * |
| 5 | + * This code is free software; you can redistribute it and/or modify it |
| 6 | + * under the terms of the GNU General Public License version 2 only, as |
| 7 | + * published by the Free Software Foundation. |
| 8 | + * |
| 9 | + * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | + * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | + * accompanied this code). |
| 14 | + * |
| 15 | + * You should have received a copy of the GNU General Public License version |
| 16 | + * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | + * |
| 19 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 | + * or visit www.oracle.com if you need additional information or have any |
| 21 | + * questions. |
| 22 | + */ |
| 23 | + |
| 24 | +/* |
| 25 | + * @test |
| 26 | + * @bug 8306929 |
| 27 | + * @summary Verify clean_previous_versions when run with JFR and CDS |
| 28 | + * @requires vm.jvmti |
| 29 | + * @requires vm.cds |
| 30 | + * @requires vm.hasJFR |
| 31 | + * @requires vm.opt.final.ClassUnloading |
| 32 | + * @requires vm.flagless |
| 33 | + * @library /test/lib |
| 34 | + * @run driver RedefineSharedClassJFR xshare-off |
| 35 | + * @run driver RedefineSharedClassJFR xshare-on |
| 36 | + */ |
| 37 | +import java.util.ArrayList; |
| 38 | +import java.util.List; |
| 39 | + |
| 40 | +import jdk.test.lib.Platform; |
| 41 | +import jdk.test.lib.process.ProcessTools; |
| 42 | +import jdk.test.lib.process.OutputAnalyzer; |
| 43 | + |
| 44 | +import jtreg.SkippedException; |
| 45 | + |
| 46 | +public class RedefineSharedClassJFR { |
| 47 | + |
| 48 | + private static final String SHOULD_CLEAN_TRUE = "Class unloading: should_clean_previous_versions = true"; |
| 49 | + private static final String SHOULD_CLEAN_FALSE = "Class unloading: should_clean_previous_versions = false"; |
| 50 | + private static final String SCRATCH_CLASS_ADDED_SHARED = "scratch class added; class is shared"; |
| 51 | + private static final String SCRATCH_CLASS_ADDED_ON_STACK = "scratch class added; one of its methods is on_stack."; |
| 52 | + |
| 53 | + public static void main(String[] args) throws Exception { |
| 54 | + // Skip test if default archive is supported. |
| 55 | + if (!Platform.isDefaultCDSArchiveSupported()) { |
| 56 | + throw new SkippedException("Supported platform"); |
| 57 | + } |
| 58 | + |
| 59 | + // Test is run with JFR which will transform a number of classes. Depending |
| 60 | + // on if the test is run with or without CDS the output will be different, |
| 61 | + // due to the fact that shared classes can never be cleaned out after retranform. |
| 62 | + if (args.length > 0) { |
| 63 | + // When run with an argument the class is used as driver and should parse |
| 64 | + // the output to verify it is correct given the command line. |
| 65 | + List<String> baseCommand = List.of( |
| 66 | + "-XX:StartFlightRecording", |
| 67 | + "-Xlog:redefine+class+iklass+add=trace,redefine+class+iklass+purge=trace", |
| 68 | + "RedefineSharedClassJFR"); |
| 69 | + |
| 70 | + if (args[0].equals("xshare-off")) { |
| 71 | + // First case is with -Xshare:off. In this case no classes are shared |
| 72 | + // and we should be able to clean out the retransformed classes. Verify |
| 73 | + // that the cleaning is done when the GC is triggered. |
| 74 | + List<String> offCommand = new ArrayList<>(); |
| 75 | + offCommand.add("-Xshare:off"); |
| 76 | + offCommand.addAll(baseCommand); |
| 77 | + ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(offCommand); |
| 78 | + new OutputAnalyzer(pb.start()) |
| 79 | + .shouldContain(SHOULD_CLEAN_TRUE) |
| 80 | + .shouldNotContain(SHOULD_CLEAN_FALSE) |
| 81 | + // We expect at least one of the transformed classes to be in use, if |
| 82 | + // not the above check that should_clean_previous should be true will also |
| 83 | + // fail. This check is to show what is expected. |
| 84 | + .shouldContain(SCRATCH_CLASS_ADDED_ON_STACK) |
| 85 | + .shouldNotContain(SCRATCH_CLASS_ADDED_SHARED) |
| 86 | + .shouldHaveExitValue(0); |
| 87 | + return; |
| 88 | + } else if (args[0].equals("xshare-on")) { |
| 89 | + // With -Xshare:on, the shared classes can never be cleaned out. Check the |
| 90 | + // logs to verify we don't try to clean when we know it is not needed. |
| 91 | + List<String> onCommand = new ArrayList<>(); |
| 92 | + onCommand.add("-Xshare:on"); |
| 93 | + onCommand.addAll(baseCommand); |
| 94 | + ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(onCommand); |
| 95 | + new OutputAnalyzer(pb.start()) |
| 96 | + .shouldContain(SHOULD_CLEAN_FALSE) |
| 97 | + .shouldNotContain(SHOULD_CLEAN_TRUE) |
| 98 | + .shouldContain(SCRATCH_CLASS_ADDED_SHARED) |
| 99 | + // If the below line occurs, then should_clean_previous_versions will be |
| 100 | + // true and the above shouldContain will trigger. This check is to |
| 101 | + // show the intention that we don't expect any non-shared transformed |
| 102 | + // classes to be in use. |
| 103 | + .shouldNotContain(SCRATCH_CLASS_ADDED_ON_STACK) |
| 104 | + .shouldHaveExitValue(0); |
| 105 | + return; |
| 106 | + } |
| 107 | + } |
| 108 | + |
| 109 | + // When run without any argument this class acts as test and we do a system GC |
| 110 | + // to trigger cleaning and get the output we want to check. |
| 111 | + System.gc(); |
| 112 | + } |
| 113 | +} |
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