1/*
2 * Copyright (c) 2015, 2016, 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 /test/lib
29 * @modules java.base/jdk.internal.misc
30 * @modules java.compiler
31 *          java.instrument
32 *          jdk.jartool/sun.tools.jar
33 * @run main RedefineClassHelper
34 * @run main/othervm -javaagent:redefineagent.jar RedefineRunningMethodsWithBacktrace
35 */
36
37import static jdk.test.lib.Asserts.*;
38
39public class RedefineRunningMethodsWithBacktrace {
40
41    public static String newB =
42                "class RedefineRunningMethodsWithBacktrace$B {" +
43                "   static int count1 = 0;" +
44                "   static int count2 = 0;" +
45                "   public static volatile boolean stop = false;" +
46                "  static void localSleep() { " +
47                "    try{ " +
48                "      Thread.currentThread().sleep(10);" +
49                "    } catch(InterruptedException ie) { " +
50                "    } " +
51                " } " +
52                "   public static void infinite() { " +
53                "       System.out.println(\"infinite called\");" +
54                "   }" +
55                "   public static void throwable() { " +
56                "       throw new RuntimeException(\"throwable called\");" +
57                "   }" +
58                "}";
59
60    public static String evenNewerB =
61                "class RedefineRunningMethodsWithBacktrace$B {" +
62                "   static int count1 = 0;" +
63                "   static int count2 = 0;" +
64                "   public static volatile boolean stop = false;" +
65                "  static void localSleep() { " +
66                "    try{ " +
67                "      Thread.currentThread().sleep(1);" +
68                "    } catch(InterruptedException ie) { " +
69                "    } " +
70                " } " +
71                "   public static void infinite() { }" +
72                "   public static void throwable() { " +
73                "       throw new RuntimeException(\"throwable called\");" +
74                "   }" +
75                "}";
76
77    static class B {
78        static int count1 = 0;
79        static int count2 = 0;
80        public static volatile boolean stop = false;
81        static void localSleep() {
82            try {
83                Thread.currentThread().sleep(10);//sleep for 10 ms
84            } catch(InterruptedException ie) {
85            }
86        }
87
88        public static void infinite() {
89            while (!stop) { count1++; localSleep(); }
90        }
91        public static void throwable() {
92            // add some stuff to the original constant pool
93            String s1 = new String ("string1");
94            String s2 = new String ("string2");
95            String s3 = new String ("string3");
96            String s4 = new String ("string4");
97            String s5 = new String ("string5");
98            String s6 = new String ("string6");
99            String s7 = new String ("string7");
100            String s8 = new String ("string8");
101            String s9 = new String ("string9");
102            String s10 = new String ("string10");
103            String s11 = new String ("string11");
104            String s12 = new String ("string12");
105            String s13 = new String ("string13");
106            String s14 = new String ("string14");
107            String s15 = new String ("string15");
108            String s16 = new String ("string16");
109            String s17 = new String ("string17");
110            String s18 = new String ("string18");
111            String s19 = new String ("string19");
112            throw new RuntimeException("throwable called");
113        }
114    }
115
116    private static void touchRedefinedMethodInBacktrace(Throwable throwable) {
117        System.out.println("touchRedefinedMethodInBacktrace: ");
118        throwable.printStackTrace();  // this actually crashes with the bug in
119                                      // java_lang_StackTraceElement::create()
120
121        // Make sure that we can convert the backtrace, which is referring to
122        // the redefined method, to a  StrackTraceElement[] without crashing.
123        StackTraceElement[] stackTrace = throwable.getStackTrace();
124        for (int i = 0; i < stackTrace.length; i++) {
125            StackTraceElement frame = stackTrace[i];
126            assertNotNull(frame.getClassName(),
127              "\nTest failed: trace[" + i + "].getClassName() returned null");
128            assertNotNull(frame.getMethodName(),
129              "\nTest failed: trace[" + i + "].getMethodName() returned null");
130        }
131    }
132
133    private static Throwable getThrowableInB() {
134        Throwable t = null;
135        try {
136            B.throwable();
137        } catch (Exception e) {
138            t = e;
139            // Don't print here because Throwable will cache the constructed stacktrace
140            // e.printStackTrace();
141        }
142        return t;
143    }
144
145
146    public static void main(String[] args) throws Exception {
147
148        new Thread() {
149            public void run() {
150                B.infinite();
151            }
152        }.start();
153
154        Throwable t1 = getThrowableInB();
155
156        RedefineClassHelper.redefineClass(B.class, newB);
157
158        System.gc();
159
160        Throwable t2 = getThrowableInB();
161
162        B.infinite();
163
164        for (int i = 0; i < 20 ; i++) {
165            String s = new String("some garbage");
166            System.gc();
167        }
168
169        RedefineClassHelper.redefineClass(B.class, evenNewerB);
170        System.gc();
171
172        Throwable t3 = getThrowableInB();
173
174        for (int i = 0; i < 20 ; i++) {
175            B.infinite();
176            String s = new String("some garbage");
177            System.gc();
178        }
179
180        touchRedefinedMethodInBacktrace(t1);
181        touchRedefinedMethodInBacktrace(t2);
182        touchRedefinedMethodInBacktrace(t3);
183
184        // purge should clean everything up.
185        B.stop = true;
186
187        for (int i = 0; i < 20 ; i++) {
188            B.infinite();
189            String s = new String("some garbage");
190            System.gc();
191        }
192    }
193}
194