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 4856981 |
duke@1 | 27 | * @summary generics: overridden method gets invoked (bridge method problem) |
duke@1 | 28 | * @author gafter |
duke@1 | 29 | * |
darcy@289 | 30 | * @compile BridgeOrder.java |
duke@1 | 31 | * @run main BridgeOrder |
duke@1 | 32 | */ |
duke@1 | 33 | |
duke@1 | 34 | interface A<T> { |
duke@1 | 35 | public void f(T x); |
duke@1 | 36 | } |
duke@1 | 37 | |
duke@1 | 38 | class X { |
duke@1 | 39 | } |
duke@1 | 40 | |
duke@1 | 41 | // Moving class B here makes the problem go away |
duke@1 | 42 | |
duke@1 | 43 | class C<T extends X> extends B<T> implements A<T> { |
duke@1 | 44 | |
duke@1 | 45 | // This also makes the problem go away. |
duke@1 | 46 | /* |
duke@1 | 47 | public void f(T x) { |
duke@1 | 48 | super.f(x); |
duke@1 | 49 | } */ |
duke@1 | 50 | } |
duke@1 | 51 | |
duke@1 | 52 | class B<T extends X> implements A<T> { |
duke@1 | 53 | public void f(T x) { |
duke@1 | 54 | System.out.println("B.f()"); |
duke@1 | 55 | } |
duke@1 | 56 | } |
duke@1 | 57 | |
duke@1 | 58 | class D extends C<X> { |
duke@1 | 59 | public void f(X y) { |
duke@1 | 60 | System.out.println("D.f()"); |
duke@1 | 61 | } |
duke@1 | 62 | } |
duke@1 | 63 | |
duke@1 | 64 | public class BridgeOrder { |
duke@1 | 65 | public static void main(String args[]) { |
duke@1 | 66 | A<X> x = new D(); |
duke@1 | 67 | x.f(new X()); |
duke@1 | 68 | } |
duke@1 | 69 | } |