Mercurial > hg > truffle
annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/CyclicAssumption.java @ 22548:6b76a24fffbd default tip
Use all variables: a, b, u,v and x, y
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Thu, 14 Jan 2016 14:20:57 +0100 |
parents | a1b3b7894611 |
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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.AtomicReferenceFieldUpdater; |
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28 |
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29 import com.oracle.truffle.api.Assumption; |
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30 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary; |
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31 import com.oracle.truffle.api.Truffle; |
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32 |
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33 /** |
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34 * Holds an {@link Assumption}, and knows how to recreate it with the same properties on |
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35 * invalidation. Used so that mutability is isolated in this class, and all other classes that need |
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36 * an assumption that may be recreated can have a final reference to an object of this class. Note |
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37 * that you should be careful that repeated invalidations do not cause a deoptimization loop in that |
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38 * same way that you would with any other assumption. |
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39 */ |
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40 public class CyclicAssumption { |
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41 |
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42 private final String name; |
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43 private volatile Assumption assumption; |
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44 |
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45 private static final AtomicReferenceFieldUpdater<CyclicAssumption, Assumption> ASSUMPTION_UPDATER = AtomicReferenceFieldUpdater.newUpdater(CyclicAssumption.class, Assumption.class, "assumption"); |
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46 |
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47 public CyclicAssumption(String name) { |
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48 this.name = name; |
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49 this.assumption = Truffle.getRuntime().createAssumption(name); |
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50 } |
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51 |
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52 @TruffleBoundary |
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53 public void invalidate() { |
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54 Assumption newAssumption = Truffle.getRuntime().createAssumption(name); |
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55 Assumption oldAssumption = ASSUMPTION_UPDATER.getAndSet(this, newAssumption); |
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56 oldAssumption.invalidate(); |
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57 } |
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58 |
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59 public Assumption getAssumption() { |
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60 return assumption; |
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61 } |
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62 |
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63 } |