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 2001-2003 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 4468840
27 * @summary generics problem with casting
28 * @author gafter
29 *
30 * @compile Casting.java
31 */
33 package test.tools.javac.generics.Casting;
35 class Test {}
37 class List<T> {
38 <T> T[] toArray(T[] a) { return null; }
39 }
41 public class Casting {
42 public static void main(String[] args) {
43 List<Test> l1 = null;
44 List<Test> l2 = (List<Test>)l1;
45 }
46 }
48 interface Map<K,V> {
49 void put(K k, V v);
50 V get(Object o);
51 }
52 interface Set<T> {
53 <T> T[] toArray(T[] a);
54 }
56 class Casting2 {
57 public static void main(String[] args){
58 Map<Integer,Set<Integer>> map = null;
59 if (map.get(new Integer(1)) == map.get(new Integer(2))) ;
60 }
61 }