Mercurial > hg > truffle
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/SLLogicalAndNode.java @ 20953:c0455554d45b
SL: some minor simplifications.
author | Christian Humer <christian.humer@gmail.com> |
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date | Tue, 14 Apr 2015 15:16:14 +0200 |
parents | abe7128ca473 |
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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 } |