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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/CyclicAssumption.java @ 20131:4b12d5355811
Truffle: do not use iterators for visitors.
author | Christian Humer <christian.humer@gmail.com> |
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date | Thu, 02 Apr 2015 01:27:27 +0200 |
parents | dc7189b2bb5f |
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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 java.util.concurrent.atomic.*; |
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28 |
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29 import com.oracle.truffle.api.*; |
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30 |
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31 /** |
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32 * Holds an {@link Assumption}, and knows how to recreate it with the same properties on |
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33 * invalidation. Used so that mutability is isolated in this class, and all other classes that need |
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34 * an assumption that may be recreated can have a final reference to an object of this class. Note |
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35 * that you should be careful that repeated invalidations do not cause a deoptimization loop in that |
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36 * same way that you would with any other assumption. |
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37 */ |
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38 public class CyclicAssumption { |
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39 |
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40 private final String name; |
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41 private final AtomicReference<Assumption> assumption; |
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42 |
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43 public CyclicAssumption(String name) { |
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44 this.name = name; |
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45 this.assumption = new AtomicReference<>(Truffle.getRuntime().createAssumption(name)); |
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46 } |
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47 |
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48 public void invalidate() { |
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49 Assumption newAssumption = Truffle.getRuntime().createAssumption(name); |
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50 Assumption oldAssumption = assumption.getAndSet(newAssumption); |
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51 oldAssumption.invalidate(); |
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52 } |
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53 |
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54 public Assumption getAssumption() { |
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55 return assumption.get(); |
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56 } |
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57 |
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58 } |