T8038414.java revision 2618:b33de166fafb 
1/*
2 * Copyright (c) 2014, 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
24import java.io.PrintWriter;
25import java.io.StringWriter;
26import java.util.ArrayList;
27import java.util.List;
28import java.util.regex.Matcher;
29import java.util.regex.Pattern;
30
31/*
32 * @test
33 * @bug 8038414
34 * @summary Constant pool's strings are not escaped properly
35 */
36public class T8038414 {
37    private static final String NEW_LINE = System.getProperty("line.separator");
38    private static final String TEST_CLASSES = System.getProperty("test.classes", ".");
39    private static final String GOLDEN_STRING = escapeString(Test.test);
40
41    private static String escapeString(String s) {
42        StringBuilder sb = new StringBuilder();
43        for (int i = 0; i < s.length(); i++) {
44            char c = s.charAt(i);
45            switch (c) {
46                case '\t':
47                    sb.append('\\').append('t');
48                    break;
49                case '\n':
50                    sb.append('\\').append('n');
51                    break;
52                case '\r':
53                    sb.append('\\').append('r');
54                    break;
55                case '\b':
56                    sb.append('\\').append('b');
57                    break;
58                case '\f':
59                    sb.append('\\').append('f');
60                    break;
61                case '\"':
62                    sb.append('\\').append('\"');
63                    break;
64                case '\'':
65                    sb.append('\\').append('\'');
66                    break;
67                case '\\':
68                    sb.append('\\').append('\\');
69                    break;
70                default:
71                    sb.append(c);
72            }
73        }
74        return sb.toString();
75    }
76
77    public static void main(String... args) {
78        new T8038414().run();
79    }
80
81    public void run() {
82        String output = javap(Test.class.getName());
83        List<String> actualValues = extractEscapedComments(output);
84        for (String a : actualValues) {
85            check(!GOLDEN_STRING.equals(a), String.format("Expected: %s, got: %s", GOLDEN_STRING, a));
86        }
87    }
88
89    private List<String> extractConstantPool(String output) {
90        List<String> cp = new ArrayList<>();
91        boolean inCp = false;
92        for (String s : output.split("\n")) {
93            if (s.equals("{")) {
94                break;
95            }
96            if (inCp) {
97                cp.add(s);
98            }
99            if (s.equals("Constant pool:")) {
100                inCp = true;
101            }
102        }
103        return cp;
104    }
105
106    /**
107     * Returns a list which contains comments of the string entry in the constant pool
108     * and the appropriate UTF-8 value.
109     *
110     * @return a list
111     */
112    private List<String> extractEscapedComments(String output) {
113        List<String> result = new ArrayList<>();
114        Pattern stringPattern = Pattern.compile(" +#\\d+ = String +#(\\d+) +// +(.*)");
115        int index = -1;
116        List<String> cp = extractConstantPool(output);
117        for (String c : cp) {
118            Matcher matcher = stringPattern.matcher(c);
119            if (matcher.matches()) {
120                index = Integer.parseInt(matcher.group(1)) - 1;
121                result.add(matcher.group(2));
122                // only one String entry
123                break;
124            }
125        }
126        check(index == -1, "Escaped string is not found in constant pool");
127        result.add(cp.get(index).replaceAll(".* +", "")); // remove #16 = Utf8
128        return result;
129    }
130
131    private String javap(String className) {
132        StringWriter sw = new StringWriter();
133        PrintWriter out = new PrintWriter(sw);
134        int rc = com.sun.tools.javap.Main.run(new String[]{"-v", "-classpath", TEST_CLASSES, className}, out);
135        out.close();
136        String output = sw.toString();
137        System.err.println("class " + className);
138        System.err.println(output);
139
140        check(rc != 0, "javap failed. rc=" + rc);
141        return output.replaceAll(NEW_LINE, "\n");
142    }
143
144    private void check(boolean cond, String msg) {
145        if (cond) {
146            throw new RuntimeException(msg);
147        }
148    }
149
150    static class Test {
151        static String test = "\\t\t\b\r\n\f\"\'\\";
152    }
153}
154