ClassLiteralWastesByteTest.java revision 3294:9adfb22ff08f 
1/*
2 * Copyright (c) 2013, 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 4965689
27 * @summary class literal code wastes a byte
28 * @modules jdk.compiler
29 *          jdk.jdeps/com.sun.tools.javap
30 */
31
32import java.io.PrintWriter;
33import java.io.StringWriter;
34import java.nio.file.Paths;
35
36public class ClassLiteralWastesByteTest {
37
38    private static final String assertionErrorMsg =
39            "Instead of ldc_w, ldc instruction should have been generated";
40
41    public static void main(String[] args) {
42        new ClassLiteralWastesByteTest().run();
43    }
44
45    void run() {
46        check("-c", Paths.get(System.getProperty("test.classes"),
47                "test.class").toString());
48    }
49
50    void check(String... params) {
51        StringWriter s;
52        String out;
53        try (PrintWriter pw = new PrintWriter(s = new StringWriter())) {
54            com.sun.tools.javap.Main.run(params, pw);
55            out = s.toString();
56        }
57        if (out.contains("ldc_w")) {
58            throw new AssertionError(assertionErrorMsg);
59        }
60    }
61
62}
63
64class test {
65    void m() {
66        Class<?> aClass = test.class;
67    }
68}
69