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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/SLEqualNode.java @ 13821:b16ec83edc73

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Documentation and more refactoring of Simple Language
author Christian Wimmer <christian.wimmer@oracle.com>
date Wed, 29 Jan 2014 20:45:43 -0800
parents 7c418666c6c9
children 64c77f0577bb
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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 @NodeInfo(shortName = "==")
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33 public abstract class SLEqualNode extends SLBinaryNode {
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34
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35 @Specialization
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36 protected boolean equal(long left, long right) {
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37 return left == right;
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38 }
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39
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40 @Specialization
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41 protected boolean equal(BigInteger left, BigInteger right) {
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42 return left.equals(right);
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43 }
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44
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45 @Specialization
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46 protected boolean equal(boolean left, boolean 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(String left, String 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(SLFunction left, SLFunction right) {
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57 /*
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58 * Our function registry maintains one canonical SLFunction object per function name, so we
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59 * do not need equals().
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60 */
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61 return left == right;
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62 }
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63
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64 @Specialization
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65 protected boolean equal(SLNull left, SLNull right) {
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66 /* There is only the singleton instance of SLNull, so we do not need equals(). */
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67 return left == right;
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68 }
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69
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70 @Generic
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71 protected boolean equal(Object left, Object right) {
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72 /*
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73 * We covered all the cases that can return true in specializations. If we compare two
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74 * values with different types, no specialization matches and we end up here.
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75 */
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76 assert !left.equals(right);
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77 return false;
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78 }
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79 }