Mercurial > hg > truffle
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ValueProfile.java @ 18164:53afdc71b311
Truffle: added PrimitiveValueProfile.
author | Chris Seaton <chris.seaton@oracle.com> |
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date | Fri, 24 Oct 2014 22:50:04 +0100 |
parents | 1e542561783e |
children | e93507e232c9 |
rev | line source |
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Truffle: new value profiles prototype.
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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 /** |
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28 * Utility class to speculate on certain properties of values. |
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29 * |
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30 * Example usage: |
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31 * |
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32 * <pre> |
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33 * private final ValueProfile classProfile = ValueProfile.createClassProfile(); |
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34 * |
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35 * return classProfile.profile(value); |
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36 * </pre> |
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37 * |
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38 * All instances of {@code ValueProfile} (and subclasses) must be held in {@code final} fields for |
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39 * compiler optimizations to take effect. |
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40 * |
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41 * @see #createPrimitiveProfile() |
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42 * @see #createIdentityProfile() |
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43 * @see #createClassProfile() |
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44 */ |
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45 public abstract class ValueProfile { |
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46 |
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47 public abstract <T> T profile(T value); |
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48 |
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49 /** |
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50 * Returns a {@link ValueProfile} that speculates on the exact class of a value. |
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51 */ |
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52 public static PrimitiveValueProfile createPrimitiveProfile() { |
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53 return new PrimitiveValueProfile(); |
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54 } |
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55 |
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56 /** |
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57 * Returns a {@link ValueProfile} that speculates on the exact class of a value. |
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58 */ |
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59 public static ValueProfile createClassProfile() { |
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60 return new ExactClassValueProfile(); |
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61 } |
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62 |
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63 /** |
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64 * Returns a {@link ValueProfile} that speculates on the object identity of a value. |
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65 */ |
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66 public static ValueProfile createIdentityProfile() { |
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67 return new IdentityValueProfile(); |
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68 } |
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69 |
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70 } |