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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/IdentityValueProfile.java @ 22157:dc83cc1f94f2
Using fully qualified imports
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Wed, 16 Sep 2015 11:33:22 +0200 |
parents | 02015aac6be9 |
children | a63bda98cfdb |
rev | line source |
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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 import java.util.Objects; |
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30 |
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31 /** |
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32 * Represents a {@link ValueProfile} that speculates on the object identity of a value. |
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33 */ |
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34 final class IdentityValueProfile extends ValueProfile { |
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35 |
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36 private static final Object UNINITIALIZED = new Object(); |
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37 private static final Object GENERIC = new Object(); |
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38 |
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39 @CompilationFinal protected Object cachedValue = UNINITIALIZED; |
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40 |
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41 IdentityValueProfile() { |
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42 } |
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43 |
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44 @Override |
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45 @SuppressWarnings("unchecked") |
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46 public <T> T profile(T value) { |
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47 if (cachedValue != GENERIC) { |
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48 if (cachedValue == value) { |
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49 return (T) cachedValue; |
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50 } else { |
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51 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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52 if (cachedValue == UNINITIALIZED) { |
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53 cachedValue = value; |
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54 } else { |
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55 cachedValue = GENERIC; |
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56 } |
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57 } |
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58 } |
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59 return value; |
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60 } |
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61 |
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62 public boolean isGeneric() { |
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63 return getCachedValue() == GENERIC; |
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64 } |
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65 |
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66 public boolean isUninitialized() { |
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67 return getCachedValue() == UNINITIALIZED; |
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68 } |
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69 |
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70 public Object getCachedValue() { |
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71 return cachedValue; |
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72 } |
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73 |
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74 @Override |
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75 public String toString() { |
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76 return String.format("%s(%s)@%x", getClass().getSimpleName(), isUninitialized() ? "uninitialized" : (isGeneric() ? "generic" : String.format("@%x", Objects.hash(cachedValue))), hashCode()); |
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77 } |
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78 |
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79 } |