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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/SLLogicalAndNode.java @ 21951:9c8c0937da41

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Moving all sources into truffle subdirectory
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 17 Jun 2015 10:58:08 +0200
parents graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/SLLogicalAndNode.java@c0455554d45b
children c07e64ecb528
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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 com.oracle.truffle.api.dsl.*;
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26 import com.oracle.truffle.api.frame.*;
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27 import com.oracle.truffle.api.nodes.*;
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28 import com.oracle.truffle.api.source.*;
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29 import com.oracle.truffle.sl.nodes.*;
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30
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31 /**
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32 * This class declares specializations similar to the extensively documented {@link SLAddNode}. It
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33 * uses one additional feature of the Truffle DSL: {@link ShortCircuit}.
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34 * <p>
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35 * Logical operations in SL use short circuit evaluation: if the evaluation of the left operand
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36 * already decides the result of the operation, the right operand must not be executed. This is
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37 * expressed in the Truffle DSL via a method annotated with {@link ShortCircuit}, which returns
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38 * whether a child needs to be executed based on the result of already executed children.
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39 */
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40 @NodeInfo(shortName = "&&")
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41 @SuppressWarnings("unused")
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42 public abstract class SLLogicalAndNode extends SLBinaryNode {
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43
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44 public SLLogicalAndNode(SourceSection src) {
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45 super(src);
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46 }
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47
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48 @Override
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49 public abstract boolean executeBoolean(VirtualFrame frame);
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50
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51 /**
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52 * This method is called after the left child was evaluated, but before the right child is
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53 * evaluated. The right child is only evaluated when the return value is {code true}.
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54 */
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55 @ShortCircuit("rightNode")
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56 protected boolean needsRightNode(boolean left) {
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57 return left;
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58 }
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59
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60 /**
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61 * Similar to {@link #needsRightNode(boolean)}, but for generic cases where the type of the left
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62 * child is not known.
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63 */
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64 @ShortCircuit("rightNode")
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65 protected boolean needsRightNode(Object left) {
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66 return left instanceof Boolean && needsRightNode(((Boolean) left).booleanValue());
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67 }
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68
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69 @Specialization
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70 protected boolean doBoolean(boolean left, boolean hasRight, boolean right) {
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71 return left && right;
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72 }
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73 }