1 /*
  2  * Copyright (c) 2018, Red Hat, Inc. 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 /**
 26  * @test
 27  * @summary Test OOME in due to classloader leak
 28  * @requires vm.gc.Shenandoah
 29  * @library /test/lib
 30  * @run driver TestClassLoaderLeak
 31  */
 32 
 33 import java.util.*;
 34 import java.io.*;
 35 import java.nio.*;
 36 import java.nio.file.*;
 37 
 38 import jdk.test.lib.process.OutputAnalyzer;
 39 import jdk.test.lib.process.ProcessTools;
 40 
 41 public class TestClassLoaderLeak {
 42 
 43     static final int SIZE = 1 * 1024 * 1024;
 44     static final int COUNT = 128;
 45 
 46     static volatile Object sink;
 47 
 48     static class Dummy {
 49         static final int[] PAYLOAD = new int[SIZE];
 50     }
 51 
 52     static class MyClassLoader extends ClassLoader {
 53         final String path;
 54 
 55         MyClassLoader(String path) {
 56             this.path = path;
 57         }
 58 
 59         public Class<?> loadClass(String name) throws ClassNotFoundException {
 60             try {
 61                 File f = new File(path, name + ".class");
 62                 if (!f.exists()) {
 63                     return super.loadClass(name);
 64                 }
 65 
 66                 Path path = Paths.get(f.getAbsolutePath());
 67                 byte[] cls = Files.readAllBytes(path);
 68                 return defineClass(name, cls, 0, cls.length, null);
 69             } catch (IOException e) {
 70                 throw new ClassNotFoundException(name);
 71             }
 72         }
 73     }
 74 
 75     static void load(String path) throws Exception {
 76         ClassLoader cl = new MyClassLoader(path);
 77         Class<Dummy> c = (Class<Dummy>) Class.forName("TestClassLoaderLeak$Dummy", true, cl);
 78         if (c.getClassLoader() != cl) {
 79             throw new IllegalStateException("Should have loaded by target loader");
 80         }
 81         sink = c;
 82     }
 83 
 84     public static void passWith(String... args) throws Exception {
 85         testWith(true, args);
 86     }
 87 
 88     public static void failWith(String... args) throws Exception {
 89         testWith(false, args);
 90     }
 91 
 92     public static void testWith(boolean shouldPass, String... args) throws Exception {
 93         List<String> pbArgs = new ArrayList<>();
 94         pbArgs.add("-Xmx128m");
 95         pbArgs.add("-XX:+UnlockExperimentalVMOptions");
 96         pbArgs.add("-XX:+UnlockDiagnosticVMOptions");
 97         pbArgs.add("-XX:+UseShenandoahGC");
 98         pbArgs.addAll(Arrays.asList(args));
 99         pbArgs.add(TestClassLoaderLeak.class.getName());
100         pbArgs.add("test");
101 
102         ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(pbArgs.toArray(new String[0]));
103 
104         OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
105 
106         if (shouldPass) {
107             analyzer.shouldHaveExitValue(0);
108             analyzer.shouldNotContain("java.lang.OutOfMemoryError");
109             analyzer.shouldContain("All good");
110         } else {
111             analyzer.shouldHaveExitValue(1);
112             analyzer.shouldContain("java.lang.OutOfMemoryError");
113             analyzer.shouldNotContain("All good");
114         }
115     }
116 
117     public static void main(String[] args) throws Exception {
118         if (args.length > 0) {
119             String classDir = TestClassLoaderLeak.class.getProtectionDomain().getCodeSource().getLocation().getPath();
120             for (int c = 0; c < COUNT; c++) {
121                 load(classDir);
122             }
123             System.out.println("All good");
124             return;
125         }
126 
127         String[][][] modeHeuristics = new String[][][] {
128              {{"satb"},    {"adaptive", "compact", "static", "aggressive"}},
129              {{"iu"},      {"adaptive", "aggressive"}},
130              {{"passive"}, {"passive"}}
131         };
132 
133         for (String[][] mh : modeHeuristics) {
134             String mode = mh[0][0];
135             String[] heuristics = mh[1];
136             for (String h : heuristics) {
137                 // Forceful enabling should work
138                 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading");
139                 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloadingWithConcurrentMark");
140 
141                 // Even when concurrent unloading is disabled, Full GC has to recover
142                 passWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:+ClassUnloading", "-XX:-ClassUnloadingWithConcurrentMark");
143 
144                 // Should OOME when unloading forcefully disabled, even if local flags try to enable it back
145                 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading");
146                 failWith("-XX:ShenandoahGCMode=" + mode, "-XX:ShenandoahGCHeuristics=" + h, "-XX:-ClassUnloading", "-XX:+ClassUnloadingWithConcurrentMark");
147             }
148         }
149     }
150 }