Mercurial > hg > truffle
comparison test/compiler/classUnloading/anonymousClass/TestAnonymousClassUnloading.java @ 20350:c3990b8c710e hs25.40-b07
8054402: "klass->is_loader_alive(_is_alive)) failed: must be alive" for anonymous classes
Summary: Because anonymous classes are not in the system dictionary, we have to set 'unloading_occurred' based on 'CLDG::do_unloading()'. Added jtreg test.
Reviewed-by: kvn, coleenp
author | thartmann |
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date | Mon, 25 Aug 2014 08:20:17 +0200 |
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20349:7fa57b65c27f | 20350:c3990b8c710e |
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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 import sun.hotspot.WhiteBox; | |
25 import sun.misc.Unsafe; | |
26 import sun.misc.IOUtils; | |
27 | |
28 import java.lang.reflect.Method; | |
29 import java.net.URL; | |
30 import java.net.URLConnection; | |
31 | |
32 /* | |
33 * @test TestAnonymousClassUnloading | |
34 * @bug 8054402 | |
35 * @summary "Tests unloading of anonymous classes." | |
36 * @library /testlibrary /testlibrary/whitebox | |
37 * @compile TestAnonymousClassUnloading.java | |
38 * @run main ClassFileInstaller TestAnonymousClassUnloading | |
39 * sun.hotspot.WhiteBox | |
40 * sun.hotspot.WhiteBox$WhiteBoxPermission | |
41 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-BackgroundCompilation TestAnonymousClassUnloading | |
42 */ | |
43 public class TestAnonymousClassUnloading { | |
44 private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); | |
45 private static final Unsafe UNSAFE = Unsafe.getUnsafe(); | |
46 private static int COMP_LEVEL_SIMPLE = 1; | |
47 private static int COMP_LEVEL_FULL_OPTIMIZATION = 4; | |
48 | |
49 /** | |
50 * We override hashCode here to be able to access this implementation | |
51 * via an Object reference (we cannot cast to TestAnonymousClassUnloading). | |
52 */ | |
53 @Override | |
54 public int hashCode() { | |
55 return 42; | |
56 } | |
57 | |
58 /** | |
59 * Does some work by using the anonymousClass. | |
60 * @param anonymousClass Class performing some work (will be unloaded) | |
61 */ | |
62 static private void doWork(Class<?> anonymousClass) throws InstantiationException, IllegalAccessException { | |
63 // Create a new instance | |
64 Object anon = anonymousClass.newInstance(); | |
65 // We would like to call a method of anonymousClass here but we cannot cast because the class | |
66 // was loaded by a different class loader. One solution would be to use reflection but since | |
67 // we want C2 to implement the call as an IC we call Object::hashCode() here which actually | |
68 // calls anonymousClass::hashCode(). C2 will then implement this call as an IC. | |
69 if (anon.hashCode() != 42) { | |
70 new RuntimeException("Work not done"); | |
71 } | |
72 } | |
73 | |
74 /** | |
75 * Makes sure that method is compiled by forcing compilation if not yet compiled. | |
76 * @param m Method to be checked | |
77 */ | |
78 static private void makeSureIsCompiled(Method m) { | |
79 // Make sure background compilation is disabled | |
80 if (WHITE_BOX.getBooleanVMFlag("BackgroundCompilation")) { | |
81 throw new RuntimeException("Background compilation enabled"); | |
82 } | |
83 | |
84 // Check if already compiled | |
85 if (!WHITE_BOX.isMethodCompiled(m)) { | |
86 // If not, try to compile it with C2 | |
87 if(!WHITE_BOX.enqueueMethodForCompilation(m, COMP_LEVEL_FULL_OPTIMIZATION)) { | |
88 // C2 compiler not available, try to compile with C1 | |
89 WHITE_BOX.enqueueMethodForCompilation(m, COMP_LEVEL_SIMPLE); | |
90 } | |
91 // Because background compilation is disabled, method should now be compiled | |
92 if(!WHITE_BOX.isMethodCompiled(m)) { | |
93 throw new RuntimeException(m + " not compiled"); | |
94 } | |
95 } | |
96 } | |
97 | |
98 /** | |
99 * This test creates stale Klass* metadata referenced by a compiled IC. | |
100 * | |
101 * The following steps are performed: | |
102 * (1) An anonymous version of TestAnonymousClassUnloading is loaded by a custom class loader | |
103 * (2) The method doWork that calls a method of the anonymous class is compiled. The call | |
104 * is implemented as an IC referencing Klass* metadata of the anonymous class. | |
105 * (3) Unloading of the anonymous class is enforced. The IC now references dead metadata. | |
106 */ | |
107 static public void main(String[] args) throws Exception { | |
108 // (1) Load an anonymous version of this class using the corresponding Unsafe method | |
109 URL classUrl = TestAnonymousClassUnloading.class.getResource("TestAnonymousClassUnloading.class"); | |
110 URLConnection connection = classUrl.openConnection(); | |
111 byte[] classBytes = IOUtils.readFully(connection.getInputStream(), connection.getContentLength(), true); | |
112 Class<?> anonymousClass = UNSAFE.defineAnonymousClass(TestAnonymousClassUnloading.class, classBytes, null); | |
113 | |
114 // (2) Make sure all paths of doWork are profiled and compiled | |
115 for (int i = 0; i < 100000; ++i) { | |
116 doWork(anonymousClass); | |
117 } | |
118 | |
119 // Make sure doWork is compiled now | |
120 Method doWork = TestAnonymousClassUnloading.class.getDeclaredMethod("doWork", Class.class); | |
121 makeSureIsCompiled(doWork); | |
122 | |
123 // (3) Throw away reference to anonymousClass to allow unloading | |
124 anonymousClass = null; | |
125 | |
126 // Force garbage collection to trigger unloading of anonymousClass | |
127 // Dead metadata reference to anonymousClass triggers JDK-8054402 | |
128 WHITE_BOX.fullGC(); | |
129 } | |
130 } |