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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ValueProfile.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 9c8c0937da41
children 71c7a1ae8829
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1 /*
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2 * Copyright (c) 2014, 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.nodes.NodeCloneable;
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28
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29 /**
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30 * Utility class to speculate on certain properties of values.
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31 *
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32 * Example usage:
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33 *
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34 * <pre>
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35 * private final ValueProfile classProfile = ValueProfile.createClassProfile();
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36 *
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37 * return classProfile.profile(value);
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38 * </pre>
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39 *
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40 * All instances of {@code ValueProfile} (and subclasses) must be held in {@code final} fields for
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41 * compiler optimizations to take effect.
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42 *
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43 * @see #createPrimitiveProfile()
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44 * @see #createIdentityProfile()
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45 * @see #createClassProfile()
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46 */
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47 public abstract class ValueProfile extends NodeCloneable {
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48
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49 public abstract <T> T profile(T value);
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50
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51 /**
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52 * Returns a {@link PrimitiveValueProfile} that speculates on the primitive equality or object
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53 * identity of a value.
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54 */
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55 public static PrimitiveValueProfile createPrimitiveProfile() {
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56 return new PrimitiveValueProfile();
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57 }
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58
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59 /**
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60 * Returns a {@link ValueProfile} that speculates on the exact class of a value.
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61 */
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62 public static ValueProfile createClassProfile() {
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63 return new ExactClassValueProfile();
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64 }
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65
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66 /**
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67 * Returns a {@link ValueProfile} that speculates on the object identity of a value.
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68 */
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69 public static ValueProfile createIdentityProfile() {
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70 return new IdentityValueProfile();
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71 }
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72
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73 }