Mercurial > hg > truffle
comparison graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/CyclicAssumption.java @ 13322:f28ea693056f
New assumption utilities.
author | Chris Seaton <chris.seaton@oracle.com> |
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date | Fri, 13 Dec 2013 15:53:30 +0000 |
parents | |
children | dc7189b2bb5f |
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13321:e585ac5a385d | 13322:f28ea693056f |
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1 /* | |
2 * Copyright (c) 2013, Oracle and/or its affiliates. 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. Oracle designates this | |
8 * particular file as subject to the "Classpath" exception as provided | |
9 * by Oracle in the LICENSE file that accompanied this code. | |
10 * | |
11 * This code is distributed in the hope that it will be useful, but WITHOUT | |
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 * version 2 for more details (a copy is included in the LICENSE file that | |
15 * accompanied this code). | |
16 * | |
17 * You should have received a copy of the GNU General Public License version | |
18 * 2 along with this work; if not, write to the Free Software Foundation, | |
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
20 * | |
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
22 * or visit www.oracle.com if you need additional information or have any | |
23 * questions. | |
24 */ | |
25 package com.oracle.truffle.api.utilities; | |
26 | |
27 import com.oracle.truffle.api.*; | |
28 | |
29 /** | |
30 * Holds an {@link Assumption}, and knows how to recreate it with the same properties on | |
31 * invalidation. Used so that mutability is isolated in this class, and all other classes that need | |
32 * an assumption that may be recreated can have a final reference to an object of this class. Note | |
33 * that you should be careful that repeated invalidations do not cause a deoptimization loop in that | |
34 * same way that you would with any other assumption. | |
35 */ | |
36 public class CyclicAssumption { | |
37 | |
38 private final String name; | |
39 private Assumption assumption; | |
40 | |
41 public CyclicAssumption(String name) { | |
42 this.name = name; | |
43 invalidate(); | |
44 } | |
45 | |
46 public void invalidate() { | |
47 if (assumption != null) { | |
48 assumption.invalidate(); | |
49 } | |
50 | |
51 assumption = Truffle.getRuntime().createAssumption(name); | |
52 } | |
53 | |
54 public Assumption getAssumption() { | |
55 return assumption; | |
56 } | |
57 | |
58 } |