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