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
duke@1 | 1 | /* |
duke@1 | 2 | * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved. |
duke@1 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@1 | 4 | * |
duke@1 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@1 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@1 | 7 | * published by the Free Software Foundation. |
duke@1 | 8 | * |
duke@1 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@1 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@1 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@1 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@1 | 13 | * accompanied this code). |
duke@1 | 14 | * |
duke@1 | 15 | * You should have received a copy of the GNU General Public License version |
duke@1 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@1 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@1 | 18 | * |
duke@1 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@1 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@1 | 21 | * have any questions. |
duke@1 | 22 | */ |
duke@1 | 23 | |
duke@1 | 24 | /* |
duke@1 | 25 | * @test |
duke@1 | 26 | * @bug 4851006 |
duke@1 | 27 | * @summary generics: type inference failure due to a bug in ClassSymbol.isLess |
duke@1 | 28 | * @author gafter |
duke@1 | 29 | * |
darcy@289 | 30 | * @compile NameOrder.java |
duke@1 | 31 | */ |
duke@1 | 32 | |
duke@1 | 33 | package test.tools.javac.generics.NameOrder; |
duke@1 | 34 | |
duke@1 | 35 | interface a {} |
duke@1 | 36 | interface b {} |
duke@1 | 37 | interface c {} |
duke@1 | 38 | |
duke@1 | 39 | class A implements a, b {} |
duke@1 | 40 | class B implements c, a {} |
duke@1 | 41 | |
duke@1 | 42 | // this is how to trigger a symptom: |
duke@1 | 43 | abstract class C { |
duke@1 | 44 | <T> T f(T t1, T t2) { return null; } |
duke@1 | 45 | void g() { |
duke@1 | 46 | a x = f( new A(), new B() ); |
duke@1 | 47 | } |
duke@1 | 48 | } |