| /* |
| * Copyright (c) 2018, 2019, 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 |
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| * |
| */ |
| |
| /* |
| * @test |
| * @summary Tests how CDS works when critical library classes are replaced with JVMTI ClassFileLoadHook |
| * @library /test/lib |
| * @requires vm.cds |
| * @build sun.hotspot.WhiteBox |
| * @run driver ClassFileInstaller -jar whitebox.jar sun.hotspot.WhiteBox |
| * @run main/othervm/native ReplaceCriticalClasses |
| */ |
| |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| import jdk.test.lib.cds.CDSTestUtils; |
| import jdk.test.lib.cds.CDSOptions; |
| import jdk.test.lib.process.OutputAnalyzer; |
| import sun.hotspot.WhiteBox; |
| |
| public class ReplaceCriticalClasses { |
| public static void main(String args[]) throws Throwable { |
| if (args.length == 0) { |
| // Dump the shared archive in case it was not generated during the JDK build. |
| // Put the archive at separate file to avoid clashes with concurrent tests. |
| CDSOptions opts = new CDSOptions() |
| .setXShareMode("dump") |
| .setArchiveName(ReplaceCriticalClasses.class.getName() + ".jsa") |
| .setUseVersion(false) |
| .addSuffix("-showversion"); |
| CDSTestUtils.run(opts).assertNormalExit(""); |
| |
| launchChildProcesses(); |
| } else if (args.length == 3 && args[0].equals("child")) { |
| Class klass = Class.forName(args[2].replace("/", ".")); |
| if (args[1].equals("-shared")) { |
| testInChild(true, klass); |
| } else if (args[1].equals("-notshared")) { |
| testInChild(false, klass); |
| } else { |
| throw new RuntimeException("Unknown child exec option " + args[1]); |
| } |
| return; |
| } else { |
| throw new RuntimeException("Usage: @run main/othervm/native ReplaceCriticalClasses"); |
| } |
| } |
| |
| static void launchChildProcesses() throws Throwable { |
| String tests[] = { |
| // CDS should be disabled -- these critical classes will be replaced |
| // because JvmtiExport::early_class_hook_env() is true. |
| "-early -notshared java/lang/Object", |
| "-early -notshared java/lang/String", |
| "-early -notshared java/lang/Cloneable", |
| "-early -notshared java/io/Serializable", |
| |
| // CDS should not be disabled -- these critical classes cannot be replaced because |
| // JvmtiExport::early_class_hook_env() is false. |
| "java/lang/Object", |
| "java/lang/String", |
| "java/lang/Cloneable", |
| "java/io/Serializable", |
| |
| // Try to replace classes that are used by the archived subgraph graphs. |
| "-subgraph java/util/ArrayList", |
| "-subgraph java/lang/module/ResolvedModule", |
| |
| // Replace classes that are loaded after JVMTI_PHASE_PRIMORDIAL. It's OK to replace |
| // such |
| // classes even when CDS is enabled. Nothing bad should happen. |
| "-notshared java/util/Locale", |
| "-notshared sun/util/locale/BaseLocale", |
| "-notshared java/lang/Readable", |
| }; |
| |
| int n = 0; |
| for (String s : tests) { |
| System.out.println("Test case[" + (n++) + "] = \"" + s + "\""); |
| String args[] = s.split("\\s+"); // split by space character |
| launchChild(args); |
| } |
| } |
| |
| static void launchChild(String args[]) throws Throwable { |
| if (args.length < 1) { |
| throw new RuntimeException("Invalid test case. Should be <-early> <-subgraph> <-notshared> klassName"); |
| } |
| String klassName = null; |
| String early = ""; |
| boolean subgraph = false; |
| String shared = "-shared"; |
| |
| for (int i=0; i<args.length-1; i++) { |
| String opt = args[i]; |
| if (opt.equals("-early")) { |
| early = "-early,"; |
| } else if (opt.equals("-subgraph")) { |
| subgraph = true; |
| } else if (opt.equals("-notshared")) { |
| shared = opt; |
| } else { |
| throw new RuntimeException("Unknown option: " + opt); |
| } |
| } |
| klassName = args[args.length-1]; |
| Class.forName(klassName.replace("/", ".")); // make sure it's a valid class |
| |
| // We will pass an option like "-agentlib:SimpleClassFileLoadHook=java/util/Locale,XXX,XXX". |
| // The SimpleClassFileLoadHook agent would attempt to hook the java/util/Locale class |
| // but leave the class file bytes unchanged (it replaces all bytes "XXX" with "XXX", i.e., |
| // a no-op). JVMTI doesn't check the class file bytes returned by the agent, so as long |
| // as the agent returns a buffer, it will not load the class from CDS, and will instead |
| // load the class by parsing the buffer. |
| // |
| // Note that for safety we don't change the contents of the class file bytes. If in the |
| // future JVMTI starts checking the contents of the class file bytes, this test would need |
| // to be updated. (You'd see the test case with java/util/Locale staring to fail). |
| String agent = "-agentlib:SimpleClassFileLoadHook=" + early + klassName + ",XXX,XXX"; |
| |
| CDSOptions opts = (new CDSOptions()) |
| .setXShareMode("auto") |
| .setArchiveName(ReplaceCriticalClasses.class.getName() + ".jsa") |
| .setUseVersion(false) |
| .addSuffix("-showversion", |
| "-Xlog:cds", |
| "-XX:+UnlockDiagnosticVMOptions", |
| agent, |
| "-XX:+WhiteBoxAPI", |
| "-Xbootclasspath/a:" + ClassFileInstaller.getJarPath("whitebox.jar")); |
| |
| if (subgraph) { |
| opts.addSuffix("-Xlog:cds+heap", |
| "-Xlog:class+load"); |
| } |
| |
| opts.addSuffix("ReplaceCriticalClasses", |
| "child", |
| shared, |
| klassName); |
| |
| final boolean expectDisable = !early.equals(""); |
| final boolean checkSubgraph = subgraph; |
| CDSTestUtils.run(opts).assertNormalExit(out -> { |
| if (expectDisable) { |
| out.shouldContain("UseSharedSpaces: CDS is disabled because early JVMTI ClassFileLoadHook is in use."); |
| System.out.println("CDS disabled as expected"); |
| } |
| if (checkSubgraph) { |
| // As of 2018/10/21 the classes in the archived subgraphs won't be |
| // replaced because all archived subgraphs were loaded in JVMTI_PHASE_PRIMORDIAL. |
| // |
| // This is the first class to be loaded after JVMTI has exited JVMTI_PHASE_PRIMORDIAL. |
| // Make sure no subgraphs are loaded afterwards. |
| // |
| // Can't use out.shouldNotMatch() because that doesn't match across multiple lines. |
| String firstNonPrimordialClass = "jdk.jfr.internal.EventWriter"; |
| String regexp = firstNonPrimordialClass + ".*initialize_from_archived_subgraph"; |
| Pattern regex = Pattern.compile(regexp, Pattern.DOTALL); |
| Matcher matcher = regex.matcher(out.getStdout()); |
| if (matcher.find()) { |
| out.reportDiagnosticSummary(); |
| throw new RuntimeException("'" + regexp |
| + "' found in stdout: '" + matcher.group() + "' \n"); |
| } |
| } |
| }); |
| } |
| |
| static void testInChild(boolean shouldBeShared, Class klass) { |
| WhiteBox wb = WhiteBox.getWhiteBox(); |
| |
| if (shouldBeShared && !wb.isSharedClass(klass)) { |
| throw new RuntimeException(klass + " should be shared but actually is not."); |
| } |
| |
| if (!shouldBeShared && wb.isSharedClass(klass)) { |
| throw new RuntimeException(klass + " should not be shared but actually is."); |
| } |
| |
| System.out.println("wb.isSharedClass(klass): " + wb.isSharedClass(klass) + " == " + shouldBeShared); |
| |
| String strings[] = { |
| // interned strings from j.l.Object |
| "@", |
| "nanosecond timeout value out of range", |
| "timeoutMillis value is negative", |
| |
| // interned strings from j.l.Integer |
| "0", |
| "0X", |
| "0x", |
| "int" |
| }; |
| |
| // Make sure the interned string table is same |
| for (String s : strings) { |
| String i = s.intern(); |
| if (s != i) { |
| throw new RuntimeException("Interned string mismatch: \"" + s + "\" @ " + System.identityHashCode(s) + |
| " vs \"" + i + "\" @ " + System.identityHashCode(i)); |
| } |
| } |
| // We have tried to use ClassFileLoadHook to replace critical library classes (which may |
| // may not have succeeded, depending on whether the agent has requested |
| // can_generate_all_class_hook_events/can_generate_early_class_hook_events capabilities). |
| // |
| // In any case, the JVM should have started properly (perhaps with CDS disabled) and |
| // the above operations should succeed. |
| System.out.println("If I can come to here without crashing, things should be OK"); |
| } |
| } |