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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/SLEqualNode.java @ 21997:c07e64ecb528

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Update SL copyright headers to use UPL
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Thu, 16 Jul 2015 15:50:46 +0200
parents 112aba5e3e12
children 503529c65456
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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 *
21997
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5 * The Universal Permissive License (UPL), Version 1.0
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6 *
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7 * Subject to the condition set forth below, permission is hereby granted to any
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8 * person obtaining a copy of this software, associated documentation and/or
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9 * data (collectively the "Software"), free of charge and under any and all
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10 * copyright rights in the Software, and any and all patent rights owned or
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11 * freely licensable by each licensor hereunder covering either (i) the
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12 * unmodified Software as contributed to or provided by such licensor, or (ii)
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13 * the Larger Works (as defined below), to deal in both
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14 *
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15 * (a) the Software, and
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16 *
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17 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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18 * one is included with the Software each a "Larger Work" to which the Software
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19 * is contributed by such licensors),
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20 *
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21 * without restriction, including without limitation the rights to copy, create
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22 * derivative works of, display, perform, and distribute the Software and make,
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23 * use, sell, offer for sale, import, export, have made, and have sold the
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24 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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25 * either these or other terms.
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26 *
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27 * This license is subject to the following condition:
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28 *
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29 * The above copyright notice and either this complete permission notice or at a
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30 * minimum a reference to the UPL must be included in all copies or substantial
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31 * portions of the Software.
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32 *
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33 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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34 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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35 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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36 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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37 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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38 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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39 * SOFTWARE.
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40 */
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41 package com.oracle.truffle.sl.nodes.expression;
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42
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43 import java.math.*;
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44
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45 import com.oracle.truffle.api.CompilerDirectives.*;
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46 import com.oracle.truffle.api.dsl.*;
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47 import com.oracle.truffle.api.frame.*;
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48 import com.oracle.truffle.api.nodes.*;
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49 import com.oracle.truffle.api.source.*;
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50 import com.oracle.truffle.sl.nodes.*;
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51 import com.oracle.truffle.sl.runtime.*;
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52
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53 /**
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54 * The {@code ==} operator of SL is defined on all types. Therefore, we need a
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55 * {@link #equal(Object, Object) generic implementation} that can handle all possible types. But
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56 * since {@code ==} can only return {@code true} when the type of the left and right operand are the
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57 * same, the specializations already cover all possible cases that can return {@code true} and the
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58 * generic case is trivial.
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59 * <p>
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60 * Note that we do not need the analogous {@code =!} operator, because we can just
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61 * {@link SLLogicalNotNode negate} the {@code ==} operator.
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62 */
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63 @NodeInfo(shortName = "==")
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64 public abstract class SLEqualNode extends SLBinaryNode {
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65
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66 public SLEqualNode(SourceSection src) {
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67 super(src);
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68 }
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69
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70 @Override
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71 public abstract boolean executeBoolean(VirtualFrame frame);
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72
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73 @Specialization
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74 protected boolean equal(long left, long right) {
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75 return left == right;
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76 }
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77
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78 @Specialization
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79 @TruffleBoundary
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80 protected boolean equal(BigInteger left, BigInteger right) {
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81 return left.equals(right);
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82 }
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83
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84 @Specialization
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85 protected boolean equal(boolean left, boolean right) {
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86 return left == right;
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87 }
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88
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89 @Specialization
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90 protected boolean equal(String left, String right) {
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91 return left.equals(right);
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92 }
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93
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94 @Specialization
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95 protected boolean equal(SLFunction left, SLFunction right) {
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96 /*
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97 * Our function registry maintains one canonical SLFunction object per function name, so we
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98 * do not need equals().
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99 */
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100 return left == right;
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101 }
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102
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103 @Specialization
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104 protected boolean equal(SLNull left, SLNull right) {
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105 /* There is only the singleton instance of SLNull, so we do not need equals(). */
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106 return left == right;
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107 }
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108
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109 /**
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110 * The {@link Fallback} annotation informs the Truffle DSL that this method should be executed
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111 * when no {@link Specialization specialized method} matches. The operand types must be
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112 * {@link Object}.
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113 */
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114 @Fallback
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115 protected boolean equal(Object left, Object right) {
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116 /*
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117 * We covered all the cases that can return true in specializations. If we compare two
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118 * values with different types, no specialization matches and we end up here.
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119 */
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120 assert !left.equals(right);
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121 return false;
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122 }
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123 }