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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/CyclicAssumption.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/CyclicAssumption.java@dc7189b2bb5f
children f410818cdec8
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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 }