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