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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/utilities/ExactClassValueProfile.java @ 17039:1e542561783e
Truffle: new value profiles prototype.
author | Christian Humer <christian.humer@gmail.com> |
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date | Wed, 03 Sep 2014 14:58:53 +0200 |
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children | 405257253e59 |
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17039
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Truffle: new value profiles prototype.
Christian Humer <christian.humer@gmail.com>
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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 |
1e542561783e
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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.*; |
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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 public 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 != null && cachedClass.isInstance(value)) { |
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44 return (T) cachedClass.cast(value); |
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45 } else { |
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46 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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47 if (cachedClass == null && value != null) { |
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48 cachedClass = value.getClass(); |
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49 } else { |
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50 cachedClass = Object.class; |
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51 } |
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52 } |
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53 return value; |
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54 } |
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55 |
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56 public boolean isGeneric() { |
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57 return cachedClass == Object.class; |
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58 } |
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59 |
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60 public boolean isUninitialized() { |
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61 return cachedClass == null; |
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62 } |
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63 |
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64 public Class<?> getCachedClass() { |
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65 return cachedClass; |
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66 } |
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67 |
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68 @Override |
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69 public String toString() { |
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70 return String.format("%s(%s)@%x", getClass().getSimpleName(), isUninitialized() ? "uninitialized" : (isGeneric() ? "generic" : cachedClass.getName()), hashCode()); |
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71 } |
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72 } |