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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/SLEqualNode.java @ 16512:abe7128ca473

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SL: upgrade source attribution
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Mon, 14 Jul 2014 16:51:41 -0700
parents afd6fa5e8229
children e5e1013c04fd
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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.api.source.*;
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30 import com.oracle.truffle.sl.nodes.*;
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31 import com.oracle.truffle.sl.runtime.*;
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32
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33 /**
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34 * The {@code ==} operator of SL is defined on all types. Therefore, we need a
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35 * {@link #equal(Object, Object) generic implementation} that can handle all possible types. But
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36 * since {@code ==} can only return {@code true} when the type of the left and right operand are the
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37 * same, the specializations already cover all possible cases that can return {@code true} and the
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38 * generic case is trivial.
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39 * <p>
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40 * Note that we do not need the analogous {@code =!} operator, because we can just
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41 * {@link SLLogicalNotNode negate} the {@code ==} operator.
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42 */
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43 @NodeInfo(shortName = "==")
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44 public abstract class SLEqualNode extends SLBinaryNode {
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45
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46 public SLEqualNode(SourceSection src) {
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47 super(src);
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48 }
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49
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50 @Specialization
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51 protected boolean equal(long left, long right) {
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52 return left == 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(BigInteger left, BigInteger right) {
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57 return left.equals(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(boolean left, boolean right) {
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62 return left == 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(String left, String right) {
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67 return left.equals(right);
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68 }
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69
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70 @Specialization
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71 protected boolean equal(SLFunction left, SLFunction right) {
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72 /*
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73 * Our function registry maintains one canonical SLFunction object per function name, so we
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74 * do not need equals().
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75 */
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76 return left == right;
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77 }
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78
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79 @Specialization
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80 protected boolean equal(SLNull left, SLNull right) {
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81 /* There is only the singleton instance of SLNull, so we do not need equals(). */
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82 return left == right;
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83 }
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84
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85 /**
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86 * The {@link Generic} annotation informs the Truffle DSL that this method should be executed
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87 * when no {@link Specialization specialized method} matches. The operand types must be
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88 * {@link Object}.
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89 */
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90 @Generic
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91 protected boolean equal(Object left, Object right) {
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92 /*
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93 * We covered all the cases that can return true in specializations. If we compare two
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94 * values with different types, no specialization matches and we end up here.
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95 */
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96 assert !left.equals(right);
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97 return false;
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98 }
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99 }