1/*
2 * Copyright (c) 2013, 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 8021897
27 * @summary Test getting the value for an uninitialized String object
28 * @author Staffan Larsen
29 *
30 * @run build TestScaffold VMConnection TargetListener TargetAdapter
31 * @run compile -g GetUninitializedStringValue.java
32 * @run driver GetUninitializedStringValue
33 */
34import com.sun.jdi.ReferenceType;
35import com.sun.jdi.StackFrame;
36import com.sun.jdi.StringReference;
37import com.sun.jdi.ThreadReference;
38import com.sun.jdi.event.BreakpointEvent;
39
40 /********** target program **********/
41
42class GetUninitializedStringValueTarg {
43    public static void main(String[] args) {
44        new String("foo");
45        System.out.println("Goodbye from GetUninitializedStringValueTarg!");
46    }
47}
48
49 /********** test program **********/
50
51public class GetUninitializedStringValue extends TestScaffold {
52    ReferenceType targetClass;
53    ThreadReference mainThread;
54
55    GetUninitializedStringValue (String args[]) {
56        super(args);
57    }
58
59    public static void main(String[] args)
60        throws Exception
61    {
62        new GetUninitializedStringValue (args).startTests();
63    }
64
65    /********** test core **********/
66
67    protected void runTests()
68        throws Exception
69    {
70        /*
71         * Run to String.<init>
72         */
73        startUp("GetUninitializedStringValueTarg");
74        BreakpointEvent bpe = resumeTo("java.lang.String", "<init>", "(Ljava/lang/String;)V");
75
76        /*
77         * We've arrived. Look at 'this' - it will be uninitialized (the value field will not be set yet).
78         */
79        StackFrame frame = bpe.thread().frame(0);
80        StringReference sr = (StringReference)frame.thisObject();
81        if (!sr.value().equals("")) {
82            throw new Exception("Unexpected value for the uninitialized String");
83        }
84
85        /*
86         * resume the target listening for events
87         */
88        listenUntilVMDisconnect();
89    }
90}
91