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 }