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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ValueProfile.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 |
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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.*; |
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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 } |