1 /* 2 * Copyright (c) 2014, 2018, 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 8031752 27 * @summary speculative traps need to be cleaned up at GC 28 * 29 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-TieredCompilation 30 * -XX:-UseOnStackReplacement -XX:-BackgroundCompilation 31 * -XX:CompileThreshold=10000 32 * -XX:+UseTypeSpeculation -XX:TypeProfileLevel=222 33 * -XX:CompileCommand=exclude,java.lang.reflect.Method::invoke 34 * -XX:CompileCommand=exclude,sun.reflect.DelegatingMethodAccessorImpl::invoke 35 * -Xmx512M 36 * compiler.profiling.TestSpecTrapClassUnloading 37 */ 38 39 package compiler.profiling; 40 41 import java.lang.reflect.Method; 42 43 public class TestSpecTrapClassUnloading { 44 static class B { 45 final public boolean m(Object o) { 46 if (o.getClass() == B.class) { 47 return true; 48 } 49 return false; 50 } 51 } 52 53 static class MemoryChunk { 54 MemoryChunk other; 55 long[] array; 56 MemoryChunk(MemoryChunk other) { 57 this.other = other; 58 array = new long[1024 * 1024 * 1024]; 59 } 60 } 61 62 static void m1(B b, Object o) { 63 b.m(o); 64 } 65 66 static void m2(B b, Object o) { 67 b.m(o); 68 } 69 70 public static void main(String[] args) throws Exception { 71 Method m = B.class.getMethod("m", Object.class); 72 Object o = new Object(); 73 B b = new B(); 74 75 // add speculative trap in B.m() for m1 76 for (int i = 0; i < 20000; i++) { 77 m1(b, b); 78 } 79 m1(b, o); 80 81 // add speculative trap in B.m() for code generated by reflection 82 for (int i = 0; i < 20000; i++) { 83 m.invoke(b, b); 84 } 85 m.invoke(b, o); 86 87 m = null; 88 89 // add speculative trap in B.m() for m2 90 for (int i = 0; i < 20000; i++) { 91 m2(b, b); 92 } 93 m2(b, o); 94 95 // Exhaust memory which causes the code generated by 96 // reflection to be unloaded but B.m() is not. 97 MemoryChunk root = null; 98 try { 99 while (true) { 100 root = new MemoryChunk(root); 101 } 102 } catch(OutOfMemoryError e) { 103 root = null; 104 } 105 } 106 }