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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/NeverValidAssumption.java @ 17057:d51c097cca37

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Truffle: Add NeverValidAssumption.
author Chris Seaton <chris.seaton@oracle.com>
date Sat, 06 Sep 2014 17:19:13 +0100
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children e9c8742148c1
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17057
d51c097cca37 Truffle: Add NeverValidAssumption.
Chris Seaton <chris.seaton@oracle.com>
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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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Chris Seaton <chris.seaton@oracle.com>
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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
d51c097cca37 Truffle: Add NeverValidAssumption.
Chris Seaton <chris.seaton@oracle.com>
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6 * under the terms of the GNU General Public License version 2 only, as
d51c097cca37 Truffle: Add NeverValidAssumption.
Chris Seaton <chris.seaton@oracle.com>
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7 * published by the Free Software Foundation. Oracle designates this
d51c097cca37 Truffle: Add NeverValidAssumption.
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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
d51c097cca37 Truffle: Add NeverValidAssumption.
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
d51c097cca37 Truffle: Add NeverValidAssumption.
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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
d51c097cca37 Truffle: Add NeverValidAssumption.
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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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Chris Seaton <chris.seaton@oracle.com>
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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
d51c097cca37 Truffle: Add NeverValidAssumption.
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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 never valid. Used as a placeholder where an assumption is needed that
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32 * should be invalid from the start.
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33 */
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34 public final class NeverValidAssumption implements Assumption {
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35
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36 public static final NeverValidAssumption INSTANCE = new NeverValidAssumption();
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37
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38 private NeverValidAssumption() {
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39 }
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40
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41 @Override
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42 public void check() throws InvalidAssumptionException {
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43 throw new InvalidAssumptionException();
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44 }
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45
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46 @Override
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47 public void invalidate() {
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48 throw new UnsupportedOperationException("Cannot invalidate this assumption - it is never valid");
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49 }
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50
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51 @Override
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52 public String getName() {
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53 return getClass().getName();
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54 }
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55
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56 @Override
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57 public boolean isValid() {
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58 return false;
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59 }
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60
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61 }