1 /*
2 * Copyright (c) 2015, 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 8087315
27 * @summary Get old method's stack trace elements after GC
28 * @library /testlibrary
29 * @modules java.base/jdk.internal.misc
30 * @modules java.compiler
31 * java.instrument
32 * jdk.jartool/sun.tools.jar
33 * @build RedefineClassHelper
34 * @run main RedefineClassHelper
35 * @run main/othervm -javaagent:redefineagent.jar RedefineRunningMethodsWithBacktrace
36 */
37
38 import static jdk.test.lib.Asserts.*;
39
40 public class RedefineRunningMethodsWithBacktrace {
41
42 public static String newB =
43 "class RedefineRunningMethodsWithBacktrace$B {" +
44 " static int count1 = 0;" +
45 " static int count2 = 0;" +
46 " public static volatile boolean stop = false;" +
47 " static void localSleep() { " +
48 " try{ " +
49 " Thread.currentThread().sleep(10);" +
50 " } catch(InterruptedException ie) { " +
51 " } " +
52 " } " +
53 " public static void infinite() { " +
54 " System.out.println(\"infinite called\");" +
55 " }" +
56 " public static void throwable() { " +
57 " throw new RuntimeException(\"throwable called\");" +
58 " }" +
59 "}";
60
61 public static String evenNewerB =
62 "class RedefineRunningMethodsWithBacktrace$B {" +
63 " static int count1 = 0;" +
64 " static int count2 = 0;" +
65 " public static volatile boolean stop = false;" +
66 " static void localSleep() { " +
67 " try{ " +
68 " Thread.currentThread().sleep(1);" +
69 " } catch(InterruptedException ie) { " +
70 " } " +
71 " } " +
72 " public static void infinite() { }" +
73 " public static void throwable() { " +
74 " throw new RuntimeException(\"throwable called\");" +
75 " }" +
76 "}";
77
78 static class B {
79 static int count1 = 0;
80 static int count2 = 0;
81 public static volatile boolean stop = false;
82 static void localSleep() {
83 try {
84 Thread.currentThread().sleep(10);//sleep for 10 ms
85 } catch(InterruptedException ie) {
86 }
87 }
88
89 public static void infinite() {
90 while (!stop) { count1++; localSleep(); }
91 }
92 public static void throwable() {
93 // add some stuff to the original constant pool
94 String s1 = new String ("string1");
95 String s2 = new String ("string2");
96 String s3 = new String ("string3");
97 String s4 = new String ("string4");
98 String s5 = new String ("string5");
99 String s6 = new String ("string6");
100 String s7 = new String ("string7");
101 String s8 = new String ("string8");
102 String s9 = new String ("string9");
103 String s10 = new String ("string10");
104 String s11 = new String ("string11");
105 String s12 = new String ("string12");
106 String s13 = new String ("string13");
107 String s14 = new String ("string14");
108 String s15 = new String ("string15");
109 String s16 = new String ("string16");
110 String s17 = new String ("string17");
111 String s18 = new String ("string18");
112 String s19 = new String ("string19");
113 throw new RuntimeException("throwable called");
114 }
115 }
116
117 private static void touchRedefinedMethodInBacktrace(Throwable throwable) {
118 System.out.println("touchRedefinedMethodInBacktrace: ");
119 throwable.printStackTrace(); // this actually crashes with the bug in
120 // java_lang_StackTraceElement::create()
121
122 // Make sure that we can convert the backtrace, which is referring to
123 // the redefined method, to a StrackTraceElement[] without crashing.
124 StackTraceElement[] stackTrace = throwable.getStackTrace();
125 for (int i = 0; i < stackTrace.length; i++) {
126 StackTraceElement frame = stackTrace[i];
127 assertNotNull(frame.getClassName(),
128 "\nTest failed: trace[" + i + "].getClassName() returned null");
129 assertNotNull(frame.getMethodName(),
130 "\nTest failed: trace[" + i + "].getMethodName() returned null");
131 }
132 }
133
134 private static Throwable getThrowableInB() {
135 Throwable t = null;
136 try {
137 B.throwable();
138 } catch (Exception e) {
139 t = e;
140 // Don't print here because Throwable will cache the constructed stacktrace
141 // e.printStackTrace();
142 }
143 return t;
144 }
145
146
147 public static void main(String[] args) throws Exception {
148
149 new Thread() {
150 public void run() {
151 B.infinite();
152 }
153 }.start();
154
155 Throwable t1 = getThrowableInB();
156
157 RedefineClassHelper.redefineClass(B.class, newB);
158
159 System.gc();
160
161 Throwable t2 = getThrowableInB();
162
163 B.infinite();
164
165 for (int i = 0; i < 20 ; i++) {
166 String s = new String("some garbage");
167 System.gc();
168 }
169
170 RedefineClassHelper.redefineClass(B.class, evenNewerB);
171 System.gc();
172
173 Throwable t3 = getThrowableInB();
174
175 for (int i = 0; i < 20 ; i++) {
176 B.infinite();
177 String s = new String("some garbage");
178 System.gc();
179 }
180
181 touchRedefinedMethodInBacktrace(t1);
182 touchRedefinedMethodInBacktrace(t2);
183 touchRedefinedMethodInBacktrace(t3);
184
185 // purge should clean everything up.
186 B.stop = true;
187
188 for (int i = 0; i < 20 ; i++) {
189 B.infinite();
190 String s = new String("some garbage");
191 System.gc();
192 }
193 }
194 }