1 /*
2  * Copyright (c) 2007, 2018, 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 package nsk.jvmti.unit.ForceEarlyReturn;
25 
26 import java.io.PrintStream;
27 import nsk.share.Consts;
28 
29 public class earlyretvoid {
30 
31     final static int NESTING_DEPTH = 8;
32 
33     static {
34         try {
35             System.loadLibrary("earlyretvoid");
36         } catch (UnsatisfiedLinkError ule) {
37             System.err.println("Could not load earlyretvoid library");
38             System.err.println("java.library.path:"
39                 + System.getProperty("java.library.path"));
40             throw ule;
41         }
42     }
43 
getReady(Class cls, int depth)44     native static void getReady(Class cls, int depth);
check()45     native static int check();
46 
47     static boolean failed = false;
48 
main(String args[])49     public static void main(String args[]) {
50         args = nsk.share.jvmti.JVMTITest.commonInit(args);
51 
52         // produce JCK-like exit status.
53         int errCode = run(args, System.out);
54         if (failed) {
55             errCode = Consts.TEST_FAILED;
56         }
57         System.exit(errCode + Consts.JCK_STATUS_BASE);
58     }
59 
run(String args[], PrintStream out)60     public static int run(String args[], PrintStream out) {
61         earlyretThread earlyretThr = new earlyretThread();
62         getReady(earlyretThread.class, NESTING_DEPTH + 1);
63 
64         earlyretThr.start();
65         try {
66             earlyretThr.join();
67         } catch (InterruptedException e) {
68             throw new Error("Unexpected " + e);
69         }
70 
71         return check();
72     }
73 
74     static class Monitor {
75     }
76 
77 
78     // Tested thread class
79     static class earlyretThread extends Thread {
80         Monitor mntr = null;
81 
run()82         public void run() {
83             mntr = new Monitor();
84             /* Start a chain of recursive calls with NESTING_DEPTH.
85              * Then ForceEarlyReturn will be called in the JVMTI native
86              * agent NESTING_DEPTH times to return from all the frames.
87              * The chain of the ForceEarlyReturn calls starts at the
88              * JVMTI Breakpoint event and continues at each Step event
89              * until return from the first frame of the countDown.
90              * The breakpoint is set in the checkPoint() method.
91              */
92             countDown(NESTING_DEPTH);
93             checkMonitor(this, "Implicit monitor");
94             checkMonitor(mntr, "Explicit monitor");
95         }
96 
countDown(int nestingCount)97         public void countDown(int nestingCount) {
98             if (nestingCount > 0) {
99                 countDown(nestingCount - 1);
100             } else {
101                 // This explicitly locked monitor must be unlocked after
102                 // ForceEarlyReturnVoid from the last countDown frame
103                 synchronized(mntr) {
104                     checkPoint(); // A breakpoint is set in this method
105                 }
106             }
107         }
108 
109         // Dummy method to be breakpointed in the JVMTI agent.
110         // The monitor 'this' is locked here implicitly
checkPoint()111         synchronized void checkPoint() {
112         }
113 
114         // Monitor must be released after last ForceEarlyReturn,
115         // so IllegalMonitorState exception is expected here.
checkMonitor(Object obj, String monitorId)116         void checkMonitor(Object obj, String monitorId) {
117             try {
118                 obj.wait(500); // milliseconds
119                 System.out.println(
120                   "Erorr: Strange state, didn't expect to be notified: "
121                    + monitorId);
122                 failed = true;
123             }
124             catch(InterruptedException ex) {
125                 System.out.println(
126                   "Time-out failure: Monitor was NOT released: "
127                    + monitorId);
128                 failed = true;
129             }
130             catch(IllegalMonitorStateException ex) {
131                 System.out.println(
132                   "Success: Monitor was released: "
133                    + monitorId);
134             }
135         }
136     }
137 }
138