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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/SLLogicalAndNode.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 9c8c0937da41
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 com.oracle.truffle.api.dsl.*;
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44 import com.oracle.truffle.api.frame.*;
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45 import com.oracle.truffle.api.nodes.*;
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46 import com.oracle.truffle.api.source.*;
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47 import com.oracle.truffle.sl.nodes.*;
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48
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49 /**
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50 * This class declares specializations similar to the extensively documented {@link SLAddNode}. It
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51 * uses one additional feature of the Truffle DSL: {@link ShortCircuit}.
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52 * <p>
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53 * Logical operations in SL use short circuit evaluation: if the evaluation of the left operand
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54 * already decides the result of the operation, the right operand must not be executed. This is
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55 * expressed in the Truffle DSL via a method annotated with {@link ShortCircuit}, which returns
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56 * whether a child needs to be executed based on the result of already executed children.
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57 */
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58 @NodeInfo(shortName = "&&")
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59 @SuppressWarnings("unused")
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60 public abstract class SLLogicalAndNode extends SLBinaryNode {
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61
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62 public SLLogicalAndNode(SourceSection src) {
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63 super(src);
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64 }
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65
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66 @Override
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67 public abstract boolean executeBoolean(VirtualFrame frame);
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68
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69 /**
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70 * This method is called after the left child was evaluated, but before the right child is
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71 * evaluated. The right child is only evaluated when the return value is {code true}.
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72 */
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73 @ShortCircuit("rightNode")
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74 protected boolean needsRightNode(boolean left) {
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75 return left;
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76 }
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77
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78 /**
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79 * Similar to {@link #needsRightNode(boolean)}, but for generic cases where the type of the left
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80 * child is not known.
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81 */
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82 @ShortCircuit("rightNode")
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83 protected boolean needsRightNode(Object left) {
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84 return left instanceof Boolean && needsRightNode(((Boolean) left).booleanValue());
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85 }
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86
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87 @Specialization
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88 protected boolean doBoolean(boolean left, boolean hasRight, boolean right) {
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89 return left && right;
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90 }
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91 }