Mercurial > hg > graal-compiler
annotate 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> |
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date | Fri, 13 Dec 2013 15:53:30 +0000 |
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children | 1c446564d36c |
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13325
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New assumption utilities.
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1 /* |
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.oracle.truffle.api.utilities; |
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26 |
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27 import com.oracle.truffle.api.*; |
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28 import com.oracle.truffle.api.nodes.*; |
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29 |
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30 /** |
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31 * An assumption that is always valid. Used as a placeholder where an assumption is needed but never |
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32 * invalidated. |
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33 */ |
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34 public class AlwaysValidAssumption implements Assumption { |
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35 |
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36 public static final AlwaysValidAssumption INSTANCE = new AlwaysValidAssumption(); |
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37 |
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38 @Override |
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39 public void check() throws InvalidAssumptionException { |
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40 } |
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41 |
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42 @Override |
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43 public void invalidate() { |
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44 throw new UnsupportedOperationException("Cannot invalidation this assumption - it is always valid"); |
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45 } |
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46 |
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47 @Override |
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48 public String getName() { |
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49 return getClass().getName(); |
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50 } |
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51 |
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52 @Override |
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53 public boolean isValid() { |
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54 return true; |
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55 } |
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56 |
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57 } |