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