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 1999 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 4099995 4118025
27 * @summary Bad optimization of "switch" statement
28 * @author dps
29 *
30 * @run clean Switch2
31 * @run compile -O Switch2.java
32 * @run main Switch2
33 */
35 public class Switch2
36 {
37 private boolean isZero( int d ) {
38 switch (d) {
39 case 0:
40 return true;
41 default:
42 return false;
43 }
44 }
46 void useSecondArgument( String a, int b ) {
47 if ( !isZero( b ) )
48 throw new RuntimeException("isZero(0) returns false?!");
49 }
51 public static void main( String[] args ) {
52 Switch2 object = new Switch2();
53 object.useSecondArgument( "42", 0 );
54 }
55 }