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comparison truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/AlwaysValidAssumption.java @ 21951:9c8c0937da41

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Moving all sources into truffle subdirectory
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 17 Jun 2015 10:58:08 +0200
parents graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/AlwaysValidAssumption.java@1c446564d36c
children dc83cc1f94f2
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21950:2a5011c7e641 21951:9c8c0937da41
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 import com.oracle.truffle.api.nodes.*;
29
30 /**
31 * An assumption that is always valid. Used as a placeholder where an assumption is needed but never
32 * invalidated.
33 */
34 public final class AlwaysValidAssumption implements Assumption {
35
36 public static final AlwaysValidAssumption INSTANCE = new AlwaysValidAssumption();
37
38 private AlwaysValidAssumption() {
39 }
40
41 @Override
42 public void check() throws InvalidAssumptionException {
43 }
44
45 @Override
46 public void invalidate() {
47 throw new UnsupportedOperationException("Cannot invalidate this assumption - it is always valid");
48 }
49
50 @Override
51 public String getName() {
52 return getClass().getName();
53 }
54
55 @Override
56 public boolean isValid() {
57 return true;
58 }
59
60 }