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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/IdentityValueProfile.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 |
parents | 1e542561783e |
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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 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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35 public 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 } |