1 /* 2 * Copyright (c) 2020, 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 * @summary Stress defining hidden classes. 27 * @requires !vm.graal.enabled 28 * @library /test/lib 29 * @modules java.compiler 30 * java.management 31 * @run main/othervm StressHiddenClasses 32 */ 33 34 import java.lang.invoke.MethodType; 35 import java.lang.invoke.MethodHandles; 36 import java.lang.invoke.MethodHandles.Lookup; 37 import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*; 38 import jdk.test.lib.compiler.InMemoryJavaCompiler; 39 40 // This test is based on vmTestbase/vm/mlvm/anonloader/share/StressClassLoadingTest.java 41 public class StressHiddenClasses { 42 43 private static final int PARSE_TIMEOUT = 0; 44 private static final int ITERATIONS = 40000; 45 46 static byte klassbuf[] = InMemoryJavaCompiler.compile("TestClass", 47 "public class TestClass { " + 48 " public static void concat(String one, String two) throws Throwable { " + 49 " System.out.println(one + two);" + 50 " } } "); 51 52 53 public void run() throws Exception { 54 for (int x = 0; x < ITERATIONS; x++) { 55 Thread parserThread = new Thread() { 56 public void run() { 57 try { 58 Lookup lookup = MethodHandles.lookup(); 59 Class<?> c = lookup.defineHiddenClass(klassbuf, true, NESTMATE).lookupClass(); 60 } catch (Throwable e) { 61 throw new RuntimeException("Unexpected exception: " + e.toString()); 62 } 63 } 64 }; 65 66 parserThread.start(); 67 parserThread.join(PARSE_TIMEOUT); 68 69 if (parserThread.isAlive()) { 70 System.out.println("parser thread may be hung!"); 71 StackTraceElement[] stack = parserThread.getStackTrace(); 72 System.out.println("parser thread stack len: " + stack.length); 73 System.out.println(parserThread + " stack trace:"); 74 for (int i = 0; i < stack.length; ++i) { 75 System.out.println(parserThread + "\tat " + stack[i]); 76 } 77 78 parserThread.join(); // Wait until either thread finishes or test times out. 79 } 80 } 81 } 82 83 84 public static void main(String[] args) throws Throwable { 85 StressHiddenClasses shc = new StressHiddenClasses(); 86 shc.run(); 87 } 88 }