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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ExactClassValueProfile.java @ 22548:6b76a24fffbd default tip

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author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents a63bda98cfdb
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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.CompilerDirectives;
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28 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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29
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30 /**
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31 * @deprecated use {@link com.oracle.truffle.api.profiles.ValueProfile#createClassProfile()} instead
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32 */
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33 @Deprecated
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34 @SuppressWarnings("deprecation")
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35 final class ExactClassValueProfile extends ValueProfile {
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36
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37 @CompilationFinal protected Class<?> cachedClass;
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38
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39 ExactClassValueProfile() {
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40 }
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41
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42 @SuppressWarnings("unchecked")
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43 @Override
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44 public <T> T profile(T value) {
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45 Class<?> c = cachedClass;
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46 if (c != Object.class) {
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47 if (c != null && value != null && c == value.getClass()) {
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48 if (CompilerDirectives.inInterpreter()) {
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49 return value;
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50 } else {
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51 return (T) c.cast(value);
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52 }
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53 } else {
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54 CompilerDirectives.transferToInterpreterAndInvalidate();
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55 if (c == null && value != null) {
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56 cachedClass = value.getClass();
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57 } else {
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58 cachedClass = Object.class;
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59 }
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60 }
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61 }
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62 return value;
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63 }
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64
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65 public boolean isGeneric() {
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66 return cachedClass == Object.class;
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67 }
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68
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69 public boolean isUninitialized() {
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70 return cachedClass == null;
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71 }
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72
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73 public Class<?> getCachedClass() {
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74 return cachedClass;
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75 }
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76
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77 @Override
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78 public String toString() {
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79 return String.format("%s(%s)@%x", getClass().getSimpleName(), isUninitialized() ? "uninitialized" : (isGeneric() ? "generic" : cachedClass.getName()), hashCode());
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80 }
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81 }