Thu, 30 Jul 2009 10:29:53 +0100
6827648: Extremely slow compilation time for visitor pattern code + generics
Summary: Javac unnecessarily recomputates type-substitutions multiple times
Reviewed-by: jjg
1 /*
2 * Copyright 2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 */
24 /*
25 * @test
26 * @bug 5009693
27 * @summary relaxed rules for array of generic type and varargs.
28 * @author gafter
29 *
30 * @compile RelaxedArrays.java
31 * @run main RelaxedArrays
32 */
34 import java.util.ArrayList;
35 import java.util.List;
37 public class RelaxedArrays {
38 static class StringList extends ArrayList<String> {
39 }
41 static <T> T select(T... tl) {
42 return tl.length == 0 ? null : tl[tl.length - 1];
43 }
45 public static void main(String[] args) {
46 List<String>[] a = new StringList[20];
47 if (select("A", "B", "C") != "C") throw new Error();
48 }
49 }