Mercurial > hg > graal-jvmci-8
comparison graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/AlwaysValidAssumption.java @ 13325:f28ea693056f
New assumption utilities.
| author | Chris Seaton <chris.seaton@oracle.com> |
|---|---|
| date | Fri, 13 Dec 2013 15:53:30 +0000 |
| parents | |
| children | 1c446564d36c |
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| 13324:e585ac5a385d | 13325: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 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 class AlwaysValidAssumption implements Assumption { | |
| 35 | |
| 36 public static final AlwaysValidAssumption INSTANCE = new AlwaysValidAssumption(); | |
| 37 | |
| 38 @Override | |
| 39 public void check() throws InvalidAssumptionException { | |
| 40 } | |
| 41 | |
| 42 @Override | |
| 43 public void invalidate() { | |
| 44 throw new UnsupportedOperationException("Cannot invalidation this assumption - it is always valid"); | |
| 45 } | |
| 46 | |
| 47 @Override | |
| 48 public String getName() { | |
| 49 return getClass().getName(); | |
| 50 } | |
| 51 | |
| 52 @Override | |
| 53 public boolean isValid() { | |
| 54 return true; | |
| 55 } | |
| 56 | |
| 57 } |