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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ExactClassValueProfile.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 02015aac6be9
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.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 * Represents a {@link ValueProfile} that speculates on the exact class of a value.
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32 */
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33 final class ExactClassValueProfile extends ValueProfile {
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34
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35 @CompilationFinal protected Class<?> cachedClass;
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36
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37 ExactClassValueProfile() {
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38 }
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39
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40 @SuppressWarnings("unchecked")
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41 @Override
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42 public <T> T profile(T value) {
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43 if (cachedClass != Object.class) {
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44 if (cachedClass != null && cachedClass.isInstance(value)) {
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45 return (T) cachedClass.cast(value);
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46 } else {
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47 CompilerDirectives.transferToInterpreterAndInvalidate();
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48 if (cachedClass == null && value != null) {
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49 cachedClass = value.getClass();
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50 } else {
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51 cachedClass = Object.class;
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52 }
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53 }
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54 }
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55 return value;
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56 }
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57
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58 public boolean isGeneric() {
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59 return cachedClass == Object.class;
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60 }
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61
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62 public boolean isUninitialized() {
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63 return cachedClass == null;
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64 }
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65
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66 public Class<?> getCachedClass() {
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67 return cachedClass;
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68 }
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69
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70 @Override
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71 public String toString() {
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72 return String.format("%s(%s)@%x", getClass().getSimpleName(), isUninitialized() ? "uninitialized" : (isGeneric() ? "generic" : cachedClass.getName()), hashCode());
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73 }
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74 }