Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/SLEqualNode.java @ 13836:64c77f0577bb
More documentation and improvements of Simple Language
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Thu, 30 Jan 2014 17:53:27 -0800 |
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1 /* |
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2 * Copyright (c) 2012, 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. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.truffle.sl.nodes.expression; |
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24 |
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25 import java.math.*; |
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26 |
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27 import com.oracle.truffle.api.dsl.*; |
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28 import com.oracle.truffle.api.nodes.*; |
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29 import com.oracle.truffle.sl.nodes.*; |
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30 import com.oracle.truffle.sl.runtime.*; |
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31 |
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32 /** |
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33 * The {@code ==} operator of SL is defined on all types. Therefore, we need a (@link |
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34 * {@link #equal(Object, Object) generic implementation} that can handle all possible types. But |
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35 * since {@code ==} can only return {@code true} when the type of the left and right operand are the |
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36 * same, the specializations already cover all possible cases that can return {@code true} and the |
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37 * generic case is trivial. |
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38 * <p> |
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39 * Note that we do not need the analogous {@code =!} operator, because we can just |
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40 * {@link SLLogicalNotNode negate} the {@code ==} operator. |
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41 */ |
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42 @NodeInfo(shortName = "==") |
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43 public abstract class SLEqualNode extends SLBinaryNode { |
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44 |
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45 @Specialization |
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46 protected boolean equal(long left, long right) { |
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47 return left == right; |
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48 } |
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49 |
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50 @Specialization |
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51 protected boolean equal(BigInteger left, BigInteger right) { |
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52 return left.equals(right); |
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53 } |
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54 |
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55 @Specialization |
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56 protected boolean equal(boolean left, boolean right) { |
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57 return left == right; |
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58 } |
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59 |
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60 @Specialization |
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61 protected boolean equal(String left, String right) { |
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62 return left.equals(right); |
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63 } |
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64 |
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65 @Specialization |
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66 protected boolean equal(SLFunction left, SLFunction right) { |
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67 /* |
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68 * Our function registry maintains one canonical SLFunction object per function name, so we |
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69 * do not need equals(). |
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70 */ |
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71 return left == right; |
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72 } |
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73 |
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74 @Specialization |
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75 protected boolean equal(SLNull left, SLNull right) { |
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76 /* There is only the singleton instance of SLNull, so we do not need equals(). */ |
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77 return left == right; |
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78 } |
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79 |
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80 /** |
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81 * The {@link Generic} annotation informs that Truffle DSL that this method should be executed |
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82 * when no {@link Specialization specialized method} matches. The operand types must be |
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83 * {@link Object}. |
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84 */ |
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85 @Generic |
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86 protected boolean equal(Object left, Object right) { |
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87 /* |
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88 * We covered all the cases that can return true in specializations. If we compare two |
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89 * values with different types, no specialization matches and we end up here. |
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90 */ |
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91 assert !left.equals(right); |
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92 return false; |
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93 } |
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94 } |