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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/IdentityValueProfile.java @ 22064:02015aac6be9

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Removing IdentityValueProfile and ExactClassValueProfile classes from the API
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 05 Aug 2015 16:47:04 +0200
parents 9c8c0937da41
children dc83cc1f94f2
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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 java.util.*;
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28
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29 import com.oracle.truffle.api.*;
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30 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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31
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32 /**
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33 * Represents a {@link ValueProfile} that speculates on the object identity of a value.
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34 */
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02015aac6be9 Removing IdentityValueProfile and ExactClassValueProfile classes from the API
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35 final class IdentityValueProfile extends ValueProfile {
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36
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37 private static final Object UNINITIALIZED = new Object();
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38 private static final Object GENERIC = new Object();
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39
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40 @CompilationFinal protected Object cachedValue = UNINITIALIZED;
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41
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42 IdentityValueProfile() {
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43 }
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44
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45 @Override
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46 @SuppressWarnings("unchecked")
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47 public <T> T profile(T value) {
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48 if (cachedValue != GENERIC) {
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49 if (cachedValue == value) {
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50 return (T) cachedValue;
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51 } else {
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52 CompilerDirectives.transferToInterpreterAndInvalidate();
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53 if (cachedValue == UNINITIALIZED) {
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54 cachedValue = value;
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55 } else {
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56 cachedValue = GENERIC;
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57 }
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58 }
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59 }
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60 return value;
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61 }
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62
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63 public boolean isGeneric() {
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64 return getCachedValue() == GENERIC;
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65 }
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66
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67 public boolean isUninitialized() {
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68 return getCachedValue() == UNINITIALIZED;
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69 }
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70
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71 public Object getCachedValue() {
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72 return cachedValue;
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73 }
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74
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75 @Override
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76 public String toString() {
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77 return String.format("%s(%s)@%x", getClass().getSimpleName(), isUninitialized() ? "uninitialized" : (isGeneric() ? "generic" : String.format("@%x", Objects.hash(cachedValue))), hashCode());
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78 }
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79
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80 }